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This commit is contained in:
Joel Speed 2018-02-06 22:27:49 +00:00
parent 9d9a1017e4
commit 94bee18f6b
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GPG key ID: 6E80578D6751DEFB
149 changed files with 44922 additions and 2 deletions
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1
go.mod
View file

@ -52,6 +52,7 @@ require (
golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a // indirect
golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
golang.org/x/tools v0.0.0-20190813214729-9dba7caff850 // indirect
google.golang.org/api v0.10.0
google.golang.org/appengine v1.6.1 // indirect
google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64 // indirect
google.golang.org/grpc v1.23.0

38
go.sum
View file

@ -1,5 +1,8 @@
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.34.0 h1:eOI3/cP2VTU6uZLDYAoic+eyzzB9YyGmJ7eIjl8rOPg=
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.38.0 h1:ROfEUZz+Gh5pa62DJWXSaonyu3StP6EA6lPEXPI6mCo=
cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
@ -52,22 +55,30 @@ github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfU
github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6 h1:ZgQEtGgCBiWRM39fZuwSd1LwSqqSW0hOdXCYYDX0R3I=
github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
github.com/google/btree v1.0.0 h1:0udJVsspx3VBr5FwtLhQQtuAsVc79tTq0ocGIPAU6qo=
github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
github.com/googleapis/gax-go/v2 v2.0.5 h1:sjZBwGj9Jlw33ImPtvFviGYvseOtDM7hkSKB7+Tv3SM=
github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
github.com/gorilla/handlers v1.4.2 h1:0QniY0USkHQ1RGCLfKxeNHK9bkDHGRYGNDFBCS+YARg=
github.com/gorilla/handlers v1.4.2/go.mod h1:Qkdc/uu4tH4g6mTK6auzZ766c4CA0Ng8+o/OAirnOIQ=
github.com/gorilla/mux v1.7.3 h1:gnP5JzjVOuiZD07fKKToCAOjS0yOpj/qPETTXCCS6hw=
github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
github.com/gorilla/websocket v1.4.0 h1:WDFjx/TMzVgy9VdMMQi2K2Emtwi2QcUQsztZ/zLaH/Q=
github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
github.com/grpc-ecosystem/go-grpc-middleware v1.0.0 h1:Iju5GlWwrvL6UBg4zJJt3btmonfrMlCDdsejg4CZE7c=
github.com/grpc-ecosystem/go-grpc-middleware v1.0.0 h1:BWIsLfhgKhV5g/oF34aRjniBHLTZe5DNekSjbAjIS6c=
github.com/grpc-ecosystem/go-grpc-middleware v1.0.0/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=
github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 h1:Ovs26xHkKqVztRpIrF/92BcuyuQ/YW4NSIpoGtfXNho=
github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
@ -75,6 +86,9 @@ github.com/grpc-ecosystem/grpc-gateway v1.9.5 h1:UImYN5qQ8tuGpGE16ZmjvcTtTw24zw1
github.com/grpc-ecosystem/grpc-gateway v1.9.5/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
github.com/gtank/cryptopasta v0.0.0-20170601214702-1f550f6f2f69 h1:7xsUJsB2NrdcttQPa7JLEaGzvdbk7KvfrjgHZXOQRo0=
github.com/gtank/cryptopasta v0.0.0-20170601214702-1f550f6f2f69/go.mod h1:YLEMZOtU+AZ7dhN9T/IpGhXVGly2bvkJQ+zxj3WeVQo=
github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/golang-lru v0.5.1 h1:0hERBMJE1eitiLkihrMvRVBYAkpHzc/J3QdDN+dAcgU=
github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
@ -83,6 +97,7 @@ github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22
github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
github.com/json-iterator/go v1.1.7 h1:KfgG9LzI+pYjr4xvmz/5H4FXjokeP+rlHLhv3iH62Fo=
github.com/json-iterator/go v1.1.7/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
@ -165,6 +180,8 @@ github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q
github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
go.etcd.io/bbolt v1.3.3 h1:MUGmc65QhB3pIlaQ5bB4LwqSj6GIonVJXpZiaKNyaKk=
go.etcd.io/bbolt v1.3.3/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
go.opencensus.io v0.21.0 h1:mU6zScU4U1YAFPHEHYk+3JC4SY7JxgkqS10ZOSyksNg=
go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
go.uber.org/atomic v1.4.0 h1:cxzIVoETapQEqDhQu3QfnvXAV4AlzcvUCxkVUFw3+EU=
go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
go.uber.org/multierr v1.1.0 h1:HoEmRHQPVSqub6w2z2d2EOVs2fjyFRGyofhKuyDq0QI=
@ -181,6 +198,7 @@ golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3 h1:x/bBzNauLQAlE3fLku/xy92Y8QwKX5HZymrMz2IiKFc=
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
golang.org/x/lint v0.0.0-20190301231843-5614ed5bae6f/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/lint v0.0.0-20190409202823-959b441ac422 h1:QzoH/1pFpZguR8NrRHLcO6jKqfv2zpuSqZLgdm7ZmjI=
golang.org/x/lint v0.0.0-20190409202823-959b441ac422/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
@ -192,18 +210,21 @@ golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73r
golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7 h1:fHDIZ2oxGnUZRN6WgWFCbYBjH9uqVPRCUVUDhs0wnbA=
golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45 h1:SVwTIAaPC2U/AvvLNZ2a7OVsmBpC8L5BlwK1whH3hm0=
golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20181108010431-42b317875d0f h1:Bl/8QSvNqXvPGPGXa2z5xUTmV7VDcZyvRZ+QQXkXTZQ=
golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@ -213,12 +234,15 @@ golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5h
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190606165138-5da285871e9c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a h1:aYOabOQFp6Vj6W1F80affTUvO9UxmJRx8K0gsfABByQ=
golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 h1:SvFZT6jyqRaOeXpc5h/JSfZenJ2O330aBsf7JfSUXmQ=
golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
@ -226,19 +250,29 @@ golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGm
golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/tools v0.0.0-20190506145303-2d16b83fe98c/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
golang.org/x/tools v0.0.0-20190606124116-d0a3d012864b/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
golang.org/x/tools v0.0.0-20190813214729-9dba7caff850 h1:I+2i9HEjvv+3iJrNMhjMJOMF/FXz9eI08iBlDF4w24I=
golang.org/x/tools v0.0.0-20190813214729-9dba7caff850/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
google.golang.org/api v0.10.0 h1:7tmAxx3oKE98VMZ+SBZzvYYWRQ9HODBxmC8mXUsraSQ=
google.golang.org/api v0.10.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/appengine v1.6.1 h1:QzqyMA1tlu6CgqCDUtU9V+ZKhLFT2dkJuANu5QaxI3I=
google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64 h1:iKtrH9Y8mcbADOP0YFaEMth7OfuHY9xHOwNj4znpM1A=
google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
google.golang.org/grpc v1.23.0 h1:AzbTB6ux+okLTzP8Ru1Xs41C303zdcfEht7MQnYJt5A=
google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
@ -257,4 +291,6 @@ gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

202
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Apache License
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513
vendor/cloud.google.com/go/compute/metadata/metadata.go generated vendored Normal file
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@ -0,0 +1,513 @@
// Copyright 2014 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package metadata provides access to Google Compute Engine (GCE)
// metadata and API service accounts.
//
// This package is a wrapper around the GCE metadata service,
// as documented at https://developers.google.com/compute/docs/metadata.
package metadata // import "cloud.google.com/go/compute/metadata"
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"runtime"
"strings"
"sync"
"time"
)
const (
// metadataIP is the documented metadata server IP address.
metadataIP = "169.254.169.254"
// metadataHostEnv is the environment variable specifying the
// GCE metadata hostname. If empty, the default value of
// metadataIP ("169.254.169.254") is used instead.
// This is variable name is not defined by any spec, as far as
// I know; it was made up for the Go package.
metadataHostEnv = "GCE_METADATA_HOST"
userAgent = "gcloud-golang/0.1"
)
type cachedValue struct {
k string
trim bool
mu sync.Mutex
v string
}
var (
projID = &cachedValue{k: "project/project-id", trim: true}
projNum = &cachedValue{k: "project/numeric-project-id", trim: true}
instID = &cachedValue{k: "instance/id", trim: true}
)
var (
defaultClient = &Client{hc: &http.Client{
Transport: &http.Transport{
Dial: (&net.Dialer{
Timeout: 2 * time.Second,
KeepAlive: 30 * time.Second,
}).Dial,
ResponseHeaderTimeout: 2 * time.Second,
},
}}
subscribeClient = &Client{hc: &http.Client{
Transport: &http.Transport{
Dial: (&net.Dialer{
Timeout: 2 * time.Second,
KeepAlive: 30 * time.Second,
}).Dial,
},
}}
)
// NotDefinedError is returned when requested metadata is not defined.
//
// The underlying string is the suffix after "/computeMetadata/v1/".
//
// This error is not returned if the value is defined to be the empty
// string.
type NotDefinedError string
func (suffix NotDefinedError) Error() string {
return fmt.Sprintf("metadata: GCE metadata %q not defined", string(suffix))
}
func (c *cachedValue) get(cl *Client) (v string, err error) {
defer c.mu.Unlock()
c.mu.Lock()
if c.v != "" {
return c.v, nil
}
if c.trim {
v, err = cl.getTrimmed(c.k)
} else {
v, err = cl.Get(c.k)
}
if err == nil {
c.v = v
}
return
}
var (
onGCEOnce sync.Once
onGCE bool
)
// OnGCE reports whether this process is running on Google Compute Engine.
func OnGCE() bool {
onGCEOnce.Do(initOnGCE)
return onGCE
}
func initOnGCE() {
onGCE = testOnGCE()
}
func testOnGCE() bool {
// The user explicitly said they're on GCE, so trust them.
if os.Getenv(metadataHostEnv) != "" {
return true
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
resc := make(chan bool, 2)
// Try two strategies in parallel.
// See https://github.com/googleapis/google-cloud-go/issues/194
go func() {
req, _ := http.NewRequest("GET", "http://"+metadataIP, nil)
req.Header.Set("User-Agent", userAgent)
res, err := defaultClient.hc.Do(req.WithContext(ctx))
if err != nil {
resc <- false
return
}
defer res.Body.Close()
resc <- res.Header.Get("Metadata-Flavor") == "Google"
}()
go func() {
addrs, err := net.LookupHost("metadata.google.internal")
if err != nil || len(addrs) == 0 {
resc <- false
return
}
resc <- strsContains(addrs, metadataIP)
}()
tryHarder := systemInfoSuggestsGCE()
if tryHarder {
res := <-resc
if res {
// The first strategy succeeded, so let's use it.
return true
}
// Wait for either the DNS or metadata server probe to
// contradict the other one and say we are running on
// GCE. Give it a lot of time to do so, since the system
// info already suggests we're running on a GCE BIOS.
timer := time.NewTimer(5 * time.Second)
defer timer.Stop()
select {
case res = <-resc:
return res
case <-timer.C:
// Too slow. Who knows what this system is.
return false
}
}
// There's no hint from the system info that we're running on
// GCE, so use the first probe's result as truth, whether it's
// true or false. The goal here is to optimize for speed for
// users who are NOT running on GCE. We can't assume that
// either a DNS lookup or an HTTP request to a blackholed IP
// address is fast. Worst case this should return when the
// metaClient's Transport.ResponseHeaderTimeout or
// Transport.Dial.Timeout fires (in two seconds).
return <-resc
}
// systemInfoSuggestsGCE reports whether the local system (without
// doing network requests) suggests that we're running on GCE. If this
// returns true, testOnGCE tries a bit harder to reach its metadata
// server.
func systemInfoSuggestsGCE() bool {
if runtime.GOOS != "linux" {
// We don't have any non-Linux clues available, at least yet.
return false
}
slurp, _ := ioutil.ReadFile("/sys/class/dmi/id/product_name")
name := strings.TrimSpace(string(slurp))
return name == "Google" || name == "Google Compute Engine"
}
// Subscribe calls Client.Subscribe on a client designed for subscribing (one with no
// ResponseHeaderTimeout).
func Subscribe(suffix string, fn func(v string, ok bool) error) error {
return subscribeClient.Subscribe(suffix, fn)
}
// Get calls Client.Get on the default client.
func Get(suffix string) (string, error) { return defaultClient.Get(suffix) }
// ProjectID returns the current instance's project ID string.
func ProjectID() (string, error) { return defaultClient.ProjectID() }
// NumericProjectID returns the current instance's numeric project ID.
func NumericProjectID() (string, error) { return defaultClient.NumericProjectID() }
// InternalIP returns the instance's primary internal IP address.
func InternalIP() (string, error) { return defaultClient.InternalIP() }
// ExternalIP returns the instance's primary external (public) IP address.
func ExternalIP() (string, error) { return defaultClient.ExternalIP() }
// Hostname returns the instance's hostname. This will be of the form
// "<instanceID>.c.<projID>.internal".
func Hostname() (string, error) { return defaultClient.Hostname() }
// InstanceTags returns the list of user-defined instance tags,
// assigned when initially creating a GCE instance.
func InstanceTags() ([]string, error) { return defaultClient.InstanceTags() }
// InstanceID returns the current VM's numeric instance ID.
func InstanceID() (string, error) { return defaultClient.InstanceID() }
// InstanceName returns the current VM's instance ID string.
func InstanceName() (string, error) { return defaultClient.InstanceName() }
// Zone returns the current VM's zone, such as "us-central1-b".
func Zone() (string, error) { return defaultClient.Zone() }
// InstanceAttributes calls Client.InstanceAttributes on the default client.
func InstanceAttributes() ([]string, error) { return defaultClient.InstanceAttributes() }
// ProjectAttributes calls Client.ProjectAttributes on the default client.
func ProjectAttributes() ([]string, error) { return defaultClient.ProjectAttributes() }
// InstanceAttributeValue calls Client.InstanceAttributeValue on the default client.
func InstanceAttributeValue(attr string) (string, error) {
return defaultClient.InstanceAttributeValue(attr)
}
// ProjectAttributeValue calls Client.ProjectAttributeValue on the default client.
func ProjectAttributeValue(attr string) (string, error) {
return defaultClient.ProjectAttributeValue(attr)
}
// Scopes calls Client.Scopes on the default client.
func Scopes(serviceAccount string) ([]string, error) { return defaultClient.Scopes(serviceAccount) }
func strsContains(ss []string, s string) bool {
for _, v := range ss {
if v == s {
return true
}
}
return false
}
// A Client provides metadata.
type Client struct {
hc *http.Client
}
// NewClient returns a Client that can be used to fetch metadata. All HTTP requests
// will use the given http.Client instead of the default client.
func NewClient(c *http.Client) *Client {
return &Client{hc: c}
}
// getETag returns a value from the metadata service as well as the associated ETag.
// This func is otherwise equivalent to Get.
func (c *Client) getETag(suffix string) (value, etag string, err error) {
// Using a fixed IP makes it very difficult to spoof the metadata service in
// a container, which is an important use-case for local testing of cloud
// deployments. To enable spoofing of the metadata service, the environment
// variable GCE_METADATA_HOST is first inspected to decide where metadata
// requests shall go.
host := os.Getenv(metadataHostEnv)
if host == "" {
// Using 169.254.169.254 instead of "metadata" here because Go
// binaries built with the "netgo" tag and without cgo won't
// know the search suffix for "metadata" is
// ".google.internal", and this IP address is documented as
// being stable anyway.
host = metadataIP
}
u := "http://" + host + "/computeMetadata/v1/" + suffix
req, _ := http.NewRequest("GET", u, nil)
req.Header.Set("Metadata-Flavor", "Google")
req.Header.Set("User-Agent", userAgent)
res, err := c.hc.Do(req)
if err != nil {
return "", "", err
}
defer res.Body.Close()
if res.StatusCode == http.StatusNotFound {
return "", "", NotDefinedError(suffix)
}
all, err := ioutil.ReadAll(res.Body)
if err != nil {
return "", "", err
}
if res.StatusCode != 200 {
return "", "", &Error{Code: res.StatusCode, Message: string(all)}
}
return string(all), res.Header.Get("Etag"), nil
}
// Get returns a value from the metadata service.
// The suffix is appended to "http://${GCE_METADATA_HOST}/computeMetadata/v1/".
//
// If the GCE_METADATA_HOST environment variable is not defined, a default of
// 169.254.169.254 will be used instead.
//
// If the requested metadata is not defined, the returned error will
// be of type NotDefinedError.
func (c *Client) Get(suffix string) (string, error) {
val, _, err := c.getETag(suffix)
return val, err
}
func (c *Client) getTrimmed(suffix string) (s string, err error) {
s, err = c.Get(suffix)
s = strings.TrimSpace(s)
return
}
func (c *Client) lines(suffix string) ([]string, error) {
j, err := c.Get(suffix)
if err != nil {
return nil, err
}
s := strings.Split(strings.TrimSpace(j), "\n")
for i := range s {
s[i] = strings.TrimSpace(s[i])
}
return s, nil
}
// ProjectID returns the current instance's project ID string.
func (c *Client) ProjectID() (string, error) { return projID.get(c) }
// NumericProjectID returns the current instance's numeric project ID.
func (c *Client) NumericProjectID() (string, error) { return projNum.get(c) }
// InstanceID returns the current VM's numeric instance ID.
func (c *Client) InstanceID() (string, error) { return instID.get(c) }
// InternalIP returns the instance's primary internal IP address.
func (c *Client) InternalIP() (string, error) {
return c.getTrimmed("instance/network-interfaces/0/ip")
}
// ExternalIP returns the instance's primary external (public) IP address.
func (c *Client) ExternalIP() (string, error) {
return c.getTrimmed("instance/network-interfaces/0/access-configs/0/external-ip")
}
// Hostname returns the instance's hostname. This will be of the form
// "<instanceID>.c.<projID>.internal".
func (c *Client) Hostname() (string, error) {
return c.getTrimmed("instance/hostname")
}
// InstanceTags returns the list of user-defined instance tags,
// assigned when initially creating a GCE instance.
func (c *Client) InstanceTags() ([]string, error) {
var s []string
j, err := c.Get("instance/tags")
if err != nil {
return nil, err
}
if err := json.NewDecoder(strings.NewReader(j)).Decode(&s); err != nil {
return nil, err
}
return s, nil
}
// InstanceName returns the current VM's instance ID string.
func (c *Client) InstanceName() (string, error) {
host, err := c.Hostname()
if err != nil {
return "", err
}
return strings.Split(host, ".")[0], nil
}
// Zone returns the current VM's zone, such as "us-central1-b".
func (c *Client) Zone() (string, error) {
zone, err := c.getTrimmed("instance/zone")
// zone is of the form "projects/<projNum>/zones/<zoneName>".
if err != nil {
return "", err
}
return zone[strings.LastIndex(zone, "/")+1:], nil
}
// InstanceAttributes returns the list of user-defined attributes,
// assigned when initially creating a GCE VM instance. The value of an
// attribute can be obtained with InstanceAttributeValue.
func (c *Client) InstanceAttributes() ([]string, error) { return c.lines("instance/attributes/") }
// ProjectAttributes returns the list of user-defined attributes
// applying to the project as a whole, not just this VM. The value of
// an attribute can be obtained with ProjectAttributeValue.
func (c *Client) ProjectAttributes() ([]string, error) { return c.lines("project/attributes/") }
// InstanceAttributeValue returns the value of the provided VM
// instance attribute.
//
// If the requested attribute is not defined, the returned error will
// be of type NotDefinedError.
//
// InstanceAttributeValue may return ("", nil) if the attribute was
// defined to be the empty string.
func (c *Client) InstanceAttributeValue(attr string) (string, error) {
return c.Get("instance/attributes/" + attr)
}
// ProjectAttributeValue returns the value of the provided
// project attribute.
//
// If the requested attribute is not defined, the returned error will
// be of type NotDefinedError.
//
// ProjectAttributeValue may return ("", nil) if the attribute was
// defined to be the empty string.
func (c *Client) ProjectAttributeValue(attr string) (string, error) {
return c.Get("project/attributes/" + attr)
}
// Scopes returns the service account scopes for the given account.
// The account may be empty or the string "default" to use the instance's
// main account.
func (c *Client) Scopes(serviceAccount string) ([]string, error) {
if serviceAccount == "" {
serviceAccount = "default"
}
return c.lines("instance/service-accounts/" + serviceAccount + "/scopes")
}
// Subscribe subscribes to a value from the metadata service.
// The suffix is appended to "http://${GCE_METADATA_HOST}/computeMetadata/v1/".
// The suffix may contain query parameters.
//
// Subscribe calls fn with the latest metadata value indicated by the provided
// suffix. If the metadata value is deleted, fn is called with the empty string
// and ok false. Subscribe blocks until fn returns a non-nil error or the value
// is deleted. Subscribe returns the error value returned from the last call to
// fn, which may be nil when ok == false.
func (c *Client) Subscribe(suffix string, fn func(v string, ok bool) error) error {
const failedSubscribeSleep = time.Second * 5
// First check to see if the metadata value exists at all.
val, lastETag, err := c.getETag(suffix)
if err != nil {
return err
}
if err := fn(val, true); err != nil {
return err
}
ok := true
if strings.ContainsRune(suffix, '?') {
suffix += "&wait_for_change=true&last_etag="
} else {
suffix += "?wait_for_change=true&last_etag="
}
for {
val, etag, err := c.getETag(suffix + url.QueryEscape(lastETag))
if err != nil {
if _, deleted := err.(NotDefinedError); !deleted {
time.Sleep(failedSubscribeSleep)
continue // Retry on other errors.
}
ok = false
}
lastETag = etag
if err := fn(val, ok); err != nil || !ok {
return err
}
}
}
// Error contains an error response from the server.
type Error struct {
// Code is the HTTP response status code.
Code int
// Message is the server response message.
Message string
}
func (e *Error) Error() string {
return fmt.Sprintf("compute: Received %d `%s`", e.Code, e.Message)
}

27
vendor/github.com/googleapis/gax-go/v2/LICENSE generated vendored Normal file
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Copyright 2016, Google Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

161
vendor/github.com/googleapis/gax-go/v2/call_option.go generated vendored Normal file
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// Copyright 2016, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package gax
import (
"math/rand"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// CallOption is an option used by Invoke to control behaviors of RPC calls.
// CallOption works by modifying relevant fields of CallSettings.
type CallOption interface {
// Resolve applies the option by modifying cs.
Resolve(cs *CallSettings)
}
// Retryer is used by Invoke to determine retry behavior.
type Retryer interface {
// Retry reports whether a request should be retriedand how long to pause before retrying
// if the previous attempt returned with err. Invoke never calls Retry with nil error.
Retry(err error) (pause time.Duration, shouldRetry bool)
}
type retryerOption func() Retryer
func (o retryerOption) Resolve(s *CallSettings) {
s.Retry = o
}
// WithRetry sets CallSettings.Retry to fn.
func WithRetry(fn func() Retryer) CallOption {
return retryerOption(fn)
}
// OnCodes returns a Retryer that retries if and only if
// the previous attempt returns a GRPC error whose error code is stored in cc.
// Pause times between retries are specified by bo.
//
// bo is only used for its parameters; each Retryer has its own copy.
func OnCodes(cc []codes.Code, bo Backoff) Retryer {
return &boRetryer{
backoff: bo,
codes: append([]codes.Code(nil), cc...),
}
}
type boRetryer struct {
backoff Backoff
codes []codes.Code
}
func (r *boRetryer) Retry(err error) (time.Duration, bool) {
st, ok := status.FromError(err)
if !ok {
return 0, false
}
c := st.Code()
for _, rc := range r.codes {
if c == rc {
return r.backoff.Pause(), true
}
}
return 0, false
}
// Backoff implements exponential backoff.
// The wait time between retries is a random value between 0 and the "retry envelope".
// The envelope starts at Initial and increases by the factor of Multiplier every retry,
// but is capped at Max.
type Backoff struct {
// Initial is the initial value of the retry envelope, defaults to 1 second.
Initial time.Duration
// Max is the maximum value of the retry envelope, defaults to 30 seconds.
Max time.Duration
// Multiplier is the factor by which the retry envelope increases.
// It should be greater than 1 and defaults to 2.
Multiplier float64
// cur is the current retry envelope
cur time.Duration
}
// Pause returns the next time.Duration that the caller should use to backoff.
func (bo *Backoff) Pause() time.Duration {
if bo.Initial == 0 {
bo.Initial = time.Second
}
if bo.cur == 0 {
bo.cur = bo.Initial
}
if bo.Max == 0 {
bo.Max = 30 * time.Second
}
if bo.Multiplier < 1 {
bo.Multiplier = 2
}
// Select a duration between 1ns and the current max. It might seem
// counterintuitive to have so much jitter, but
// https://www.awsarchitectureblog.com/2015/03/backoff.html argues that
// that is the best strategy.
d := time.Duration(1 + rand.Int63n(int64(bo.cur)))
bo.cur = time.Duration(float64(bo.cur) * bo.Multiplier)
if bo.cur > bo.Max {
bo.cur = bo.Max
}
return d
}
type grpcOpt []grpc.CallOption
func (o grpcOpt) Resolve(s *CallSettings) {
s.GRPC = o
}
// WithGRPCOptions allows passing gRPC call options during client creation.
func WithGRPCOptions(opt ...grpc.CallOption) CallOption {
return grpcOpt(append([]grpc.CallOption(nil), opt...))
}
// CallSettings allow fine-grained control over how calls are made.
type CallSettings struct {
// Retry returns a Retryer to be used to control retry logic of a method call.
// If Retry is nil or the returned Retryer is nil, the call will not be retried.
Retry func() Retryer
// CallOptions to be forwarded to GRPC.
GRPC []grpc.CallOption
}

39
vendor/github.com/googleapis/gax-go/v2/gax.go generated vendored Normal file
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// Copyright 2016, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Package gax contains a set of modules which aid the development of APIs
// for clients and servers based on gRPC and Google API conventions.
//
// Application code will rarely need to use this library directly.
// However, code generated automatically from API definition files can use it
// to simplify code generation and to provide more convenient and idiomatic API surfaces.
package gax
// Version specifies the gax-go version being used.
const Version = "2.0.4"

3
vendor/github.com/googleapis/gax-go/v2/go.mod generated vendored Normal file
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@ -0,0 +1,3 @@
module github.com/googleapis/gax-go/v2
require google.golang.org/grpc v1.19.0

25
vendor/github.com/googleapis/gax-go/v2/go.sum generated vendored Normal file
View file

@ -0,0 +1,25 @@
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/net v0.0.0-20180826012351-8a410e7b638d h1:g9qWBGx4puODJTMVyoPrpoxPFgVGd+z1DZwjfRu4d0I=
golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522 h1:Ve1ORMCxvRmSXBwJK+t3Oy+V2vRW2OetUQBq4rJIkZE=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8 h1:Nw54tB0rB7hY/N0NQvRW8DG4Yk3Q6T9cu9RcFQDu1tc=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/grpc v1.19.0 h1:cfg4PD8YEdSFnm7qLV4++93WcmhH2nIUhMjhdCvl3j8=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

53
vendor/github.com/googleapis/gax-go/v2/header.go generated vendored Normal file
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// Copyright 2018, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package gax
import "bytes"
// XGoogHeader is for use by the Google Cloud Libraries only.
//
// XGoogHeader formats key-value pairs.
// The resulting string is suitable for x-goog-api-client header.
func XGoogHeader(keyval ...string) string {
if len(keyval) == 0 {
return ""
}
if len(keyval)%2 != 0 {
panic("gax.Header: odd argument count")
}
var buf bytes.Buffer
for i := 0; i < len(keyval); i += 2 {
buf.WriteByte(' ')
buf.WriteString(keyval[i])
buf.WriteByte('/')
buf.WriteString(keyval[i+1])
}
return buf.String()[1:]
}

99
vendor/github.com/googleapis/gax-go/v2/invoke.go generated vendored Normal file
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// Copyright 2016, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package gax
import (
"context"
"strings"
"time"
)
// APICall is a user defined call stub.
type APICall func(context.Context, CallSettings) error
// Invoke calls the given APICall,
// performing retries as specified by opts, if any.
func Invoke(ctx context.Context, call APICall, opts ...CallOption) error {
var settings CallSettings
for _, opt := range opts {
opt.Resolve(&settings)
}
return invoke(ctx, call, settings, Sleep)
}
// Sleep is similar to time.Sleep, but it can be interrupted by ctx.Done() closing.
// If interrupted, Sleep returns ctx.Err().
func Sleep(ctx context.Context, d time.Duration) error {
t := time.NewTimer(d)
select {
case <-ctx.Done():
t.Stop()
return ctx.Err()
case <-t.C:
return nil
}
}
type sleeper func(ctx context.Context, d time.Duration) error
// invoke implements Invoke, taking an additional sleeper argument for testing.
func invoke(ctx context.Context, call APICall, settings CallSettings, sp sleeper) error {
var retryer Retryer
for {
err := call(ctx, settings)
if err == nil {
return nil
}
if settings.Retry == nil {
return err
}
// Never retry permanent certificate errors. (e.x. if ca-certificates
// are not installed). We should only make very few, targeted
// exceptions: many (other) status=Unavailable should be retried, such
// as if there's a network hiccup, or the internet goes out for a
// minute. This is also why here we are doing string parsing instead of
// simply making Unavailable a non-retried code elsewhere.
if strings.Contains(err.Error(), "x509: certificate signed by unknown authority") {
return err
}
if retryer == nil {
if r := settings.Retry(); r != nil {
retryer = r
} else {
return err
}
}
if d, ok := retryer.Retry(err); !ok {
return err
} else if err = sp(ctx, d); err != nil {
return err
}
}
}

362
vendor/github.com/hashicorp/golang-lru/LICENSE generated vendored Normal file
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Mozilla Public License, version 2.0
1. Definitions
1.1. "Contributor"
means each individual or legal entity that creates, contributes to the
creation of, or owns Covered Software.
1.2. "Contributor Version"
means the combination of the Contributions of others (if any) used by a
Contributor and that particular Contributor's Contribution.
1.3. "Contribution"
means Covered Software of a particular Contributor.
1.4. "Covered Software"
means Source Code Form to which the initial Contributor has attached the
notice in Exhibit A, the Executable Form of such Source Code Form, and
Modifications of such Source Code Form, in each case including portions
thereof.
1.5. "Incompatible With Secondary Licenses"
means
a. that the initial Contributor has attached the notice described in
Exhibit B to the Covered Software; or
b. that the Covered Software was made available under the terms of
version 1.1 or earlier of the License, but not also under the terms of
a Secondary License.
1.6. "Executable Form"
means any form of the work other than Source Code Form.
1.7. "Larger Work"
means a work that combines Covered Software with other material, in a
separate file or files, that is not Covered Software.
1.8. "License"
means this document.
1.9. "Licensable"
means having the right to grant, to the maximum extent possible, whether
at the time of the initial grant or subsequently, any and all of the
rights conveyed by this License.
1.10. "Modifications"
means any of the following:
a. any file in Source Code Form that results from an addition to,
deletion from, or modification of the contents of Covered Software; or
b. any new file in Source Code Form that contains any Covered Software.
1.11. "Patent Claims" of a Contributor
means any patent claim(s), including without limitation, method,
process, and apparatus claims, in any patent Licensable by such
Contributor that would be infringed, but for the grant of the License,
by the making, using, selling, offering for sale, having made, import,
or transfer of either its Contributions or its Contributor Version.
1.12. "Secondary License"
means either the GNU General Public License, Version 2.0, the GNU Lesser
General Public License, Version 2.1, the GNU Affero General Public
License, Version 3.0, or any later versions of those licenses.
1.13. "Source Code Form"
means the form of the work preferred for making modifications.
1.14. "You" (or "Your")
means an individual or a legal entity exercising rights under this
License. For legal entities, "You" includes any entity that controls, is
controlled by, or is under common control with You. For purposes of this
definition, "control" means (a) the power, direct or indirect, to cause
the direction or management of such entity, whether by contract or
otherwise, or (b) ownership of more than fifty percent (50%) of the
outstanding shares or beneficial ownership of such entity.
2. License Grants and Conditions
2.1. Grants
Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license:
a. under intellectual property rights (other than patent or trademark)
Licensable by such Contributor to use, reproduce, make available,
modify, display, perform, distribute, and otherwise exploit its
Contributions, either on an unmodified basis, with Modifications, or
as part of a Larger Work; and
b. under Patent Claims of such Contributor to make, use, sell, offer for
sale, have made, import, and otherwise transfer either its
Contributions or its Contributor Version.
2.2. Effective Date
The licenses granted in Section 2.1 with respect to any Contribution
become effective for each Contribution on the date the Contributor first
distributes such Contribution.
2.3. Limitations on Grant Scope
The licenses granted in this Section 2 are the only rights granted under
this License. No additional rights or licenses will be implied from the
distribution or licensing of Covered Software under this License.
Notwithstanding Section 2.1(b) above, no patent license is granted by a
Contributor:
a. for any code that a Contributor has removed from Covered Software; or
b. for infringements caused by: (i) Your and any other third party's
modifications of Covered Software, or (ii) the combination of its
Contributions with other software (except as part of its Contributor
Version); or
c. under Patent Claims infringed by Covered Software in the absence of
its Contributions.
This License does not grant any rights in the trademarks, service marks,
or logos of any Contributor (except as may be necessary to comply with
the notice requirements in Section 3.4).
2.4. Subsequent Licenses
No Contributor makes additional grants as a result of Your choice to
distribute the Covered Software under a subsequent version of this
License (see Section 10.2) or under the terms of a Secondary License (if
permitted under the terms of Section 3.3).
2.5. Representation
Each Contributor represents that the Contributor believes its
Contributions are its original creation(s) or it has sufficient rights to
grant the rights to its Contributions conveyed by this License.
2.6. Fair Use
This License is not intended to limit any rights You have under
applicable copyright doctrines of fair use, fair dealing, or other
equivalents.
2.7. Conditions
Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
Section 2.1.
3. Responsibilities
3.1. Distribution of Source Form
All distribution of Covered Software in Source Code Form, including any
Modifications that You create or to which You contribute, must be under
the terms of this License. You must inform recipients that the Source
Code Form of the Covered Software is governed by the terms of this
License, and how they can obtain a copy of this License. You may not
attempt to alter or restrict the recipients' rights in the Source Code
Form.
3.2. Distribution of Executable Form
If You distribute Covered Software in Executable Form then:
a. such Covered Software must also be made available in Source Code Form,
as described in Section 3.1, and You must inform recipients of the
Executable Form how they can obtain a copy of such Source Code Form by
reasonable means in a timely manner, at a charge no more than the cost
of distribution to the recipient; and
b. You may distribute such Executable Form under the terms of this
License, or sublicense it under different terms, provided that the
license for the Executable Form does not attempt to limit or alter the
recipients' rights in the Source Code Form under this License.
3.3. Distribution of a Larger Work
You may create and distribute a Larger Work under terms of Your choice,
provided that You also comply with the requirements of this License for
the Covered Software. If the Larger Work is a combination of Covered
Software with a work governed by one or more Secondary Licenses, and the
Covered Software is not Incompatible With Secondary Licenses, this
License permits You to additionally distribute such Covered Software
under the terms of such Secondary License(s), so that the recipient of
the Larger Work may, at their option, further distribute the Covered
Software under the terms of either this License or such Secondary
License(s).
3.4. Notices
You may not remove or alter the substance of any license notices
(including copyright notices, patent notices, disclaimers of warranty, or
limitations of liability) contained within the Source Code Form of the
Covered Software, except that You may alter any license notices to the
extent required to remedy known factual inaccuracies.
3.5. Application of Additional Terms
You may choose to offer, and to charge a fee for, warranty, support,
indemnity or liability obligations to one or more recipients of Covered
Software. However, You may do so only on Your own behalf, and not on
behalf of any Contributor. You must make it absolutely clear that any
such warranty, support, indemnity, or liability obligation is offered by
You alone, and You hereby agree to indemnify every Contributor for any
liability incurred by such Contributor as a result of warranty, support,
indemnity or liability terms You offer. You may include additional
disclaimers of warranty and limitations of liability specific to any
jurisdiction.
4. Inability to Comply Due to Statute or Regulation
If it is impossible for You to comply with any of the terms of this License
with respect to some or all of the Covered Software due to statute,
judicial order, or regulation then You must: (a) comply with the terms of
this License to the maximum extent possible; and (b) describe the
limitations and the code they affect. Such description must be placed in a
text file included with all distributions of the Covered Software under
this License. Except to the extent prohibited by statute or regulation,
such description must be sufficiently detailed for a recipient of ordinary
skill to be able to understand it.
5. Termination
5.1. The rights granted under this License will terminate automatically if You
fail to comply with any of its terms. However, if You become compliant,
then the rights granted under this License from a particular Contributor
are reinstated (a) provisionally, unless and until such Contributor
explicitly and finally terminates Your grants, and (b) on an ongoing
basis, if such Contributor fails to notify You of the non-compliance by
some reasonable means prior to 60 days after You have come back into
compliance. Moreover, Your grants from a particular Contributor are
reinstated on an ongoing basis if such Contributor notifies You of the
non-compliance by some reasonable means, this is the first time You have
received notice of non-compliance with this License from such
Contributor, and You become compliant prior to 30 days after Your receipt
of the notice.
5.2. If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions,
counter-claims, and cross-claims) alleging that a Contributor Version
directly or indirectly infringes any patent, then the rights granted to
You by any and all Contributors for the Covered Software under Section
2.1 of this License shall terminate.
5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
license agreements (excluding distributors and resellers) which have been
validly granted by You or Your distributors under this License prior to
termination shall survive termination.
6. Disclaimer of Warranty
Covered Software is provided under this License on an "as is" basis,
without warranty of any kind, either expressed, implied, or statutory,
including, without limitation, warranties that the Covered Software is free
of defects, merchantable, fit for a particular purpose or non-infringing.
The entire risk as to the quality and performance of the Covered Software
is with You. Should any Covered Software prove defective in any respect,
You (not any Contributor) assume the cost of any necessary servicing,
repair, or correction. This disclaimer of warranty constitutes an essential
part of this License. No use of any Covered Software is authorized under
this License except under this disclaimer.
7. Limitation of Liability
Under no circumstances and under no legal theory, whether tort (including
negligence), contract, or otherwise, shall any Contributor, or anyone who
distributes Covered Software as permitted above, be liable to You for any
direct, indirect, special, incidental, or consequential damages of any
character including, without limitation, damages for lost profits, loss of
goodwill, work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses, even if such party shall have been
informed of the possibility of such damages. This limitation of liability
shall not apply to liability for death or personal injury resulting from
such party's negligence to the extent applicable law prohibits such
limitation. Some jurisdictions do not allow the exclusion or limitation of
incidental or consequential damages, so this exclusion and limitation may
not apply to You.
8. Litigation
Any litigation relating to this License may be brought only in the courts
of a jurisdiction where the defendant maintains its principal place of
business and such litigation shall be governed by laws of that
jurisdiction, without reference to its conflict-of-law provisions. Nothing
in this Section shall prevent a party's ability to bring cross-claims or
counter-claims.
9. Miscellaneous
This License represents the complete agreement concerning the subject
matter hereof. If any provision of this License is held to be
unenforceable, such provision shall be reformed only to the extent
necessary to make it enforceable. Any law or regulation which provides that
the language of a contract shall be construed against the drafter shall not
be used to construe this License against a Contributor.
10. Versions of the License
10.1. New Versions
Mozilla Foundation is the license steward. Except as provided in Section
10.3, no one other than the license steward has the right to modify or
publish new versions of this License. Each version will be given a
distinguishing version number.
10.2. Effect of New Versions
You may distribute the Covered Software under the terms of the version
of the License under which You originally received the Covered Software,
or under the terms of any subsequent version published by the license
steward.
10.3. Modified Versions
If you create software not governed by this License, and you want to
create a new license for such software, you may create and use a
modified version of this License if you rename the license and remove
any references to the name of the license steward (except to note that
such modified license differs from this License).
10.4. Distributing Source Code Form that is Incompatible With Secondary
Licenses If You choose to distribute Source Code Form that is
Incompatible With Secondary Licenses under the terms of this version of
the License, the notice described in Exhibit B of this License must be
attached.
Exhibit A - Source Code Form License Notice
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
If it is not possible or desirable to put the notice in a particular file,
then You may include the notice in a location (such as a LICENSE file in a
relevant directory) where a recipient would be likely to look for such a
notice.
You may add additional accurate notices of copyright ownership.
Exhibit B - "Incompatible With Secondary Licenses" Notice
This Source Code Form is "Incompatible
With Secondary Licenses", as defined by
the Mozilla Public License, v. 2.0.

161
vendor/github.com/hashicorp/golang-lru/simplelru/lru.go generated vendored Normal file
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package simplelru
import (
"container/list"
"errors"
)
// EvictCallback is used to get a callback when a cache entry is evicted
type EvictCallback func(key interface{}, value interface{})
// LRU implements a non-thread safe fixed size LRU cache
type LRU struct {
size int
evictList *list.List
items map[interface{}]*list.Element
onEvict EvictCallback
}
// entry is used to hold a value in the evictList
type entry struct {
key interface{}
value interface{}
}
// NewLRU constructs an LRU of the given size
func NewLRU(size int, onEvict EvictCallback) (*LRU, error) {
if size <= 0 {
return nil, errors.New("Must provide a positive size")
}
c := &LRU{
size: size,
evictList: list.New(),
items: make(map[interface{}]*list.Element),
onEvict: onEvict,
}
return c, nil
}
// Purge is used to completely clear the cache.
func (c *LRU) Purge() {
for k, v := range c.items {
if c.onEvict != nil {
c.onEvict(k, v.Value.(*entry).value)
}
delete(c.items, k)
}
c.evictList.Init()
}
// Add adds a value to the cache. Returns true if an eviction occurred.
func (c *LRU) Add(key, value interface{}) (evicted bool) {
// Check for existing item
if ent, ok := c.items[key]; ok {
c.evictList.MoveToFront(ent)
ent.Value.(*entry).value = value
return false
}
// Add new item
ent := &entry{key, value}
entry := c.evictList.PushFront(ent)
c.items[key] = entry
evict := c.evictList.Len() > c.size
// Verify size not exceeded
if evict {
c.removeOldest()
}
return evict
}
// Get looks up a key's value from the cache.
func (c *LRU) Get(key interface{}) (value interface{}, ok bool) {
if ent, ok := c.items[key]; ok {
c.evictList.MoveToFront(ent)
return ent.Value.(*entry).value, true
}
return
}
// Contains checks if a key is in the cache, without updating the recent-ness
// or deleting it for being stale.
func (c *LRU) Contains(key interface{}) (ok bool) {
_, ok = c.items[key]
return ok
}
// Peek returns the key value (or undefined if not found) without updating
// the "recently used"-ness of the key.
func (c *LRU) Peek(key interface{}) (value interface{}, ok bool) {
var ent *list.Element
if ent, ok = c.items[key]; ok {
return ent.Value.(*entry).value, true
}
return nil, ok
}
// Remove removes the provided key from the cache, returning if the
// key was contained.
func (c *LRU) Remove(key interface{}) (present bool) {
if ent, ok := c.items[key]; ok {
c.removeElement(ent)
return true
}
return false
}
// RemoveOldest removes the oldest item from the cache.
func (c *LRU) RemoveOldest() (key interface{}, value interface{}, ok bool) {
ent := c.evictList.Back()
if ent != nil {
c.removeElement(ent)
kv := ent.Value.(*entry)
return kv.key, kv.value, true
}
return nil, nil, false
}
// GetOldest returns the oldest entry
func (c *LRU) GetOldest() (key interface{}, value interface{}, ok bool) {
ent := c.evictList.Back()
if ent != nil {
kv := ent.Value.(*entry)
return kv.key, kv.value, true
}
return nil, nil, false
}
// Keys returns a slice of the keys in the cache, from oldest to newest.
func (c *LRU) Keys() []interface{} {
keys := make([]interface{}, len(c.items))
i := 0
for ent := c.evictList.Back(); ent != nil; ent = ent.Prev() {
keys[i] = ent.Value.(*entry).key
i++
}
return keys
}
// Len returns the number of items in the cache.
func (c *LRU) Len() int {
return c.evictList.Len()
}
// removeOldest removes the oldest item from the cache.
func (c *LRU) removeOldest() {
ent := c.evictList.Back()
if ent != nil {
c.removeElement(ent)
}
}
// removeElement is used to remove a given list element from the cache
func (c *LRU) removeElement(e *list.Element) {
c.evictList.Remove(e)
kv := e.Value.(*entry)
delete(c.items, kv.key)
if c.onEvict != nil {
c.onEvict(kv.key, kv.value)
}
}

36
vendor/github.com/hashicorp/golang-lru/simplelru/lru_interface.go generated vendored Normal file
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package simplelru
// LRUCache is the interface for simple LRU cache.
type LRUCache interface {
// Adds a value to the cache, returns true if an eviction occurred and
// updates the "recently used"-ness of the key.
Add(key, value interface{}) bool
// Returns key's value from the cache and
// updates the "recently used"-ness of the key. #value, isFound
Get(key interface{}) (value interface{}, ok bool)
// Check if a key exsists in cache without updating the recent-ness.
Contains(key interface{}) (ok bool)
// Returns key's value without updating the "recently used"-ness of the key.
Peek(key interface{}) (value interface{}, ok bool)
// Removes a key from the cache.
Remove(key interface{}) bool
// Removes the oldest entry from cache.
RemoveOldest() (interface{}, interface{}, bool)
// Returns the oldest entry from the cache. #key, value, isFound
GetOldest() (interface{}, interface{}, bool)
// Returns a slice of the keys in the cache, from oldest to newest.
Keys() []interface{}
// Returns the number of items in the cache.
Len() int
// Clear all cache entries
Purge()
}

9
vendor/go.opencensus.io/.gitignore generated vendored Normal file
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@ -0,0 +1,9 @@
/.idea/
# go.opencensus.io/exporter/aws
/exporter/aws/
# Exclude vendor, use dep ensure after checkout:
/vendor/github.com/
/vendor/golang.org/
/vendor/google.golang.org/

17
vendor/go.opencensus.io/.travis.yml generated vendored Normal file
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@ -0,0 +1,17 @@
language: go
go_import_path: go.opencensus.io
go:
- 1.11.x
env:
global:
GO111MODULE=on
before_script:
- make install-tools
script:
- make travis-ci
- go run internal/check/version.go # TODO move this to makefile

1
vendor/go.opencensus.io/AUTHORS generated vendored Normal file
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@ -0,0 +1 @@
Google Inc.

63
vendor/go.opencensus.io/CONTRIBUTING.md generated vendored Normal file
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@ -0,0 +1,63 @@
# How to contribute
We'd love to accept your patches and contributions to this project. There are
just a few small guidelines you need to follow.
## Contributor License Agreement
Contributions to this project must be accompanied by a Contributor License
Agreement. You (or your employer) retain the copyright to your contribution,
this simply gives us permission to use and redistribute your contributions as
part of the project. Head over to <https://cla.developers.google.com/> to see
your current agreements on file or to sign a new one.
You generally only need to submit a CLA once, so if you've already submitted one
(even if it was for a different project), you probably don't need to do it
again.
## Code reviews
All submissions, including submissions by project members, require review. We
use GitHub pull requests for this purpose. Consult [GitHub Help] for more
information on using pull requests.
[GitHub Help]: https://help.github.com/articles/about-pull-requests/
## Instructions
Fork the repo, checkout the upstream repo to your GOPATH by:
```
$ go get -d go.opencensus.io
```
Add your fork as an origin:
```
cd $(go env GOPATH)/src/go.opencensus.io
git remote add fork git@github.com:YOUR_GITHUB_USERNAME/opencensus-go.git
```
Run tests:
```
$ make install-tools # Only first time.
$ make
```
Checkout a new branch, make modifications and push the branch to your fork:
```
$ git checkout -b feature
# edit files
$ git commit
$ git push fork feature
```
Open a pull request against the main opencensus-go repo.
## General Notes
This project uses Appveyor and Travis for CI.
The dependencies are managed with `go mod` if you work with the sources under your
`$GOPATH` you need to set the environment variable `GO111MODULE=on`.

231
vendor/go.opencensus.io/Gopkg.lock generated vendored Normal file
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@ -0,0 +1,231 @@
# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
[[projects]]
branch = "master"
digest = "1:eee9386329f4fcdf8d6c0def0c9771b634bdd5ba460d888aa98c17d59b37a76c"
name = "git.apache.org/thrift.git"
packages = ["lib/go/thrift"]
pruneopts = "UT"
revision = "6e67faa92827ece022380b211c2caaadd6145bf5"
source = "github.com/apache/thrift"
[[projects]]
branch = "master"
digest = "1:d6afaeed1502aa28e80a4ed0981d570ad91b2579193404256ce672ed0a609e0d"
name = "github.com/beorn7/perks"
packages = ["quantile"]
pruneopts = "UT"
revision = "3a771d992973f24aa725d07868b467d1ddfceafb"
[[projects]]
digest = "1:4c0989ca0bcd10799064318923b9bc2db6b4d6338dd75f3f2d86c3511aaaf5cf"
name = "github.com/golang/protobuf"
packages = [
"proto",
"ptypes",
"ptypes/any",
"ptypes/duration",
"ptypes/timestamp",
]
pruneopts = "UT"
revision = "aa810b61a9c79d51363740d207bb46cf8e620ed5"
version = "v1.2.0"
[[projects]]
digest = "1:ff5ebae34cfbf047d505ee150de27e60570e8c394b3b8fdbb720ff6ac71985fc"
name = "github.com/matttproud/golang_protobuf_extensions"
packages = ["pbutil"]
pruneopts = "UT"
revision = "c12348ce28de40eed0136aa2b644d0ee0650e56c"
version = "v1.0.1"
[[projects]]
digest = "1:824c8f3aa4c5f23928fa84ebbd5ed2e9443b3f0cb958a40c1f2fbed5cf5e64b1"
name = "github.com/openzipkin/zipkin-go"
packages = [
".",
"idgenerator",
"model",
"propagation",
"reporter",
"reporter/http",
]
pruneopts = "UT"
revision = "d455a5674050831c1e187644faa4046d653433c2"
version = "v0.1.1"
[[projects]]
digest = "1:d14a5f4bfecf017cb780bdde1b6483e5deb87e12c332544d2c430eda58734bcb"
name = "github.com/prometheus/client_golang"
packages = [
"prometheus",
"prometheus/promhttp",
]
pruneopts = "UT"
revision = "c5b7fccd204277076155f10851dad72b76a49317"
version = "v0.8.0"
[[projects]]
branch = "master"
digest = "1:2d5cd61daa5565187e1d96bae64dbbc6080dacf741448e9629c64fd93203b0d4"
name = "github.com/prometheus/client_model"
packages = ["go"]
pruneopts = "UT"
revision = "5c3871d89910bfb32f5fcab2aa4b9ec68e65a99f"
[[projects]]
branch = "master"
digest = "1:63b68062b8968092eb86bedc4e68894bd096ea6b24920faca8b9dcf451f54bb5"
name = "github.com/prometheus/common"
packages = [
"expfmt",
"internal/bitbucket.org/ww/goautoneg",
"model",
]
pruneopts = "UT"
revision = "c7de2306084e37d54b8be01f3541a8464345e9a5"
[[projects]]
branch = "master"
digest = "1:8c49953a1414305f2ff5465147ee576dd705487c35b15918fcd4efdc0cb7a290"
name = "github.com/prometheus/procfs"
packages = [
".",
"internal/util",
"nfs",
"xfs",
]
pruneopts = "UT"
revision = "05ee40e3a273f7245e8777337fc7b46e533a9a92"
[[projects]]
branch = "master"
digest = "1:deafe4ab271911fec7de5b693d7faae3f38796d9eb8622e2b9e7df42bb3dfea9"
name = "golang.org/x/net"
packages = [
"context",
"http/httpguts",
"http2",
"http2/hpack",
"idna",
"internal/timeseries",
"trace",
]
pruneopts = "UT"
revision = "922f4815f713f213882e8ef45e0d315b164d705c"
[[projects]]
branch = "master"
digest = "1:e0140c0c868c6e0f01c0380865194592c011fe521d6e12d78bfd33e756fe018a"
name = "golang.org/x/sync"
packages = ["semaphore"]
pruneopts = "UT"
revision = "1d60e4601c6fd243af51cc01ddf169918a5407ca"
[[projects]]
branch = "master"
digest = "1:a3f00ac457c955fe86a41e1495e8f4c54cb5399d609374c5cc26aa7d72e542c8"
name = "golang.org/x/sys"
packages = ["unix"]
pruneopts = "UT"
revision = "3b58ed4ad3395d483fc92d5d14123ce2c3581fec"
[[projects]]
digest = "1:a2ab62866c75542dd18d2b069fec854577a20211d7c0ea6ae746072a1dccdd18"
name = "golang.org/x/text"
packages = [
"collate",
"collate/build",
"internal/colltab",
"internal/gen",
"internal/tag",
"internal/triegen",
"internal/ucd",
"language",
"secure/bidirule",
"transform",
"unicode/bidi",
"unicode/cldr",
"unicode/norm",
"unicode/rangetable",
]
pruneopts = "UT"
revision = "f21a4dfb5e38f5895301dc265a8def02365cc3d0"
version = "v0.3.0"
[[projects]]
branch = "master"
digest = "1:c0c17c94fe8bc1ab34e7f586a4a8b788c5e1f4f9f750ff23395b8b2f5a523530"
name = "google.golang.org/api"
packages = ["support/bundler"]
pruneopts = "UT"
revision = "e21acd801f91da814261b938941d193bb036441a"
[[projects]]
branch = "master"
digest = "1:077c1c599507b3b3e9156d17d36e1e61928ee9b53a5b420f10f28ebd4a0b275c"
name = "google.golang.org/genproto"
packages = ["googleapis/rpc/status"]
pruneopts = "UT"
revision = "c66870c02cf823ceb633bcd05be3c7cda29976f4"
[[projects]]
digest = "1:3dd7996ce6bf52dec6a2f69fa43e7c4cefea1d4dfa3c8ab7a5f8a9f7434e239d"
name = "google.golang.org/grpc"
packages = [
".",
"balancer",
"balancer/base",
"balancer/roundrobin",
"codes",
"connectivity",
"credentials",
"encoding",
"encoding/proto",
"grpclog",
"internal",
"internal/backoff",
"internal/channelz",
"internal/envconfig",
"internal/grpcrand",
"internal/transport",
"keepalive",
"metadata",
"naming",
"peer",
"resolver",
"resolver/dns",
"resolver/passthrough",
"stats",
"status",
"tap",
]
pruneopts = "UT"
revision = "32fb0ac620c32ba40a4626ddf94d90d12cce3455"
version = "v1.14.0"
[solve-meta]
analyzer-name = "dep"
analyzer-version = 1
input-imports = [
"git.apache.org/thrift.git/lib/go/thrift",
"github.com/golang/protobuf/proto",
"github.com/openzipkin/zipkin-go",
"github.com/openzipkin/zipkin-go/model",
"github.com/openzipkin/zipkin-go/reporter",
"github.com/openzipkin/zipkin-go/reporter/http",
"github.com/prometheus/client_golang/prometheus",
"github.com/prometheus/client_golang/prometheus/promhttp",
"golang.org/x/net/context",
"golang.org/x/net/http2",
"google.golang.org/api/support/bundler",
"google.golang.org/grpc",
"google.golang.org/grpc/codes",
"google.golang.org/grpc/grpclog",
"google.golang.org/grpc/metadata",
"google.golang.org/grpc/stats",
"google.golang.org/grpc/status",
]
solver-name = "gps-cdcl"
solver-version = 1

36
vendor/go.opencensus.io/Gopkg.toml generated vendored Normal file
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@ -0,0 +1,36 @@
# For v0.x.y dependencies, prefer adding a constraints of the form: version=">= 0.x.y"
# to avoid locking to a particular minor version which can cause dep to not be
# able to find a satisfying dependency graph.
[[constraint]]
branch = "master"
name = "git.apache.org/thrift.git"
source = "github.com/apache/thrift"
[[constraint]]
name = "github.com/golang/protobuf"
version = "1.0.0"
[[constraint]]
name = "github.com/openzipkin/zipkin-go"
version = ">=0.1.0"
[[constraint]]
name = "github.com/prometheus/client_golang"
version = ">=0.8.0"
[[constraint]]
branch = "master"
name = "golang.org/x/net"
[[constraint]]
branch = "master"
name = "google.golang.org/api"
[[constraint]]
name = "google.golang.org/grpc"
version = "1.11.3"
[prune]
go-tests = true
unused-packages = true

202
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@ -0,0 +1,202 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
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To apply the Apache License to your work, attach the following
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See the License for the specific language governing permissions and
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96
vendor/go.opencensus.io/Makefile generated vendored Normal file
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@ -0,0 +1,96 @@
# TODO: Fix this on windows.
ALL_SRC := $(shell find . -name '*.go' \
-not -path './vendor/*' \
-not -path '*/gen-go/*' \
-type f | sort)
ALL_PKGS := $(shell go list $(sort $(dir $(ALL_SRC))))
GOTEST_OPT?=-v -race -timeout 30s
GOTEST_OPT_WITH_COVERAGE = $(GOTEST_OPT) -coverprofile=coverage.txt -covermode=atomic
GOTEST=go test
GOFMT=gofmt
GOLINT=golint
GOVET=go vet
EMBEDMD=embedmd
# TODO decide if we need to change these names.
TRACE_ID_LINT_EXCEPTION="type name will be used as trace.TraceID by other packages"
TRACE_OPTION_LINT_EXCEPTION="type name will be used as trace.TraceOptions by other packages"
README_FILES := $(shell find . -name '*README.md' | sort | tr '\n' ' ')
.DEFAULT_GOAL := fmt-lint-vet-embedmd-test
.PHONY: fmt-lint-vet-embedmd-test
fmt-lint-vet-embedmd-test: fmt lint vet embedmd test
# TODO enable test-with-coverage in tavis
.PHONY: travis-ci
travis-ci: fmt lint vet embedmd test test-386
all-pkgs:
@echo $(ALL_PKGS) | tr ' ' '\n' | sort
all-srcs:
@echo $(ALL_SRC) | tr ' ' '\n' | sort
.PHONY: test
test:
$(GOTEST) $(GOTEST_OPT) $(ALL_PKGS)
.PHONY: test-386
test-386:
GOARCH=386 $(GOTEST) -v -timeout 30s $(ALL_PKGS)
.PHONY: test-with-coverage
test-with-coverage:
$(GOTEST) $(GOTEST_OPT_WITH_COVERAGE) $(ALL_PKGS)
.PHONY: fmt
fmt:
@FMTOUT=`$(GOFMT) -s -l $(ALL_SRC) 2>&1`; \
if [ "$$FMTOUT" ]; then \
echo "$(GOFMT) FAILED => gofmt the following files:\n"; \
echo "$$FMTOUT\n"; \
exit 1; \
else \
echo "Fmt finished successfully"; \
fi
.PHONY: lint
lint:
@LINTOUT=`$(GOLINT) $(ALL_PKGS) | grep -v $(TRACE_ID_LINT_EXCEPTION) | grep -v $(TRACE_OPTION_LINT_EXCEPTION) 2>&1`; \
if [ "$$LINTOUT" ]; then \
echo "$(GOLINT) FAILED => clean the following lint errors:\n"; \
echo "$$LINTOUT\n"; \
exit 1; \
else \
echo "Lint finished successfully"; \
fi
.PHONY: vet
vet:
# TODO: Understand why go vet downloads "github.com/google/go-cmp v0.2.0"
@VETOUT=`$(GOVET) ./... | grep -v "go: downloading" 2>&1`; \
if [ "$$VETOUT" ]; then \
echo "$(GOVET) FAILED => go vet the following files:\n"; \
echo "$$VETOUT\n"; \
exit 1; \
else \
echo "Vet finished successfully"; \
fi
.PHONY: embedmd
embedmd:
@EMBEDMDOUT=`$(EMBEDMD) -d $(README_FILES) 2>&1`; \
if [ "$$EMBEDMDOUT" ]; then \
echo "$(EMBEDMD) FAILED => embedmd the following files:\n"; \
echo "$$EMBEDMDOUT\n"; \
exit 1; \
else \
echo "Embedmd finished successfully"; \
fi
.PHONY: install-tools
install-tools:
go get -u golang.org/x/tools/cmd/cover
go get -u golang.org/x/lint/golint
go get -u github.com/rakyll/embedmd

263
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# OpenCensus Libraries for Go
[![Build Status][travis-image]][travis-url]
[![Windows Build Status][appveyor-image]][appveyor-url]
[![GoDoc][godoc-image]][godoc-url]
[![Gitter chat][gitter-image]][gitter-url]
OpenCensus Go is a Go implementation of OpenCensus, a toolkit for
collecting application performance and behavior monitoring data.
Currently it consists of three major components: tags, stats and tracing.
## Installation
```
$ go get -u go.opencensus.io
```
The API of this project is still evolving, see: [Deprecation Policy](#deprecation-policy).
The use of vendoring or a dependency management tool is recommended.
## Prerequisites
OpenCensus Go libraries require Go 1.8 or later.
## Getting Started
The easiest way to get started using OpenCensus in your application is to use an existing
integration with your RPC framework:
* [net/http](https://godoc.org/go.opencensus.io/plugin/ochttp)
* [gRPC](https://godoc.org/go.opencensus.io/plugin/ocgrpc)
* [database/sql](https://godoc.org/github.com/opencensus-integrations/ocsql)
* [Go kit](https://godoc.org/github.com/go-kit/kit/tracing/opencensus)
* [Groupcache](https://godoc.org/github.com/orijtech/groupcache)
* [Caddy webserver](https://godoc.org/github.com/orijtech/caddy)
* [MongoDB](https://godoc.org/github.com/orijtech/mongo-go-driver)
* [Redis gomodule/redigo](https://godoc.org/github.com/orijtech/redigo)
* [Redis goredis/redis](https://godoc.org/github.com/orijtech/redis)
* [Memcache](https://godoc.org/github.com/orijtech/gomemcache)
If you're using a framework not listed here, you could either implement your own middleware for your
framework or use [custom stats](#stats) and [spans](#spans) directly in your application.
## Exporters
OpenCensus can export instrumentation data to various backends.
OpenCensus has exporter implementations for the following, users
can implement their own exporters by implementing the exporter interfaces
([stats](https://godoc.org/go.opencensus.io/stats/view#Exporter),
[trace](https://godoc.org/go.opencensus.io/trace#Exporter)):
* [Prometheus][exporter-prom] for stats
* [OpenZipkin][exporter-zipkin] for traces
* [Stackdriver][exporter-stackdriver] Monitoring for stats and Trace for traces
* [Jaeger][exporter-jaeger] for traces
* [AWS X-Ray][exporter-xray] for traces
* [Datadog][exporter-datadog] for stats and traces
* [Graphite][exporter-graphite] for stats
* [Honeycomb][exporter-honeycomb] for traces
## Overview
![OpenCensus Overview](https://i.imgur.com/cf4ElHE.jpg)
In a microservices environment, a user request may go through
multiple services until there is a response. OpenCensus allows
you to instrument your services and collect diagnostics data all
through your services end-to-end.
## Tags
Tags represent propagated key-value pairs. They are propagated using `context.Context`
in the same process or can be encoded to be transmitted on the wire. Usually, this will
be handled by an integration plugin, e.g. `ocgrpc.ServerHandler` and `ocgrpc.ClientHandler`
for gRPC.
Package `tag` allows adding or modifying tags in the current context.
[embedmd]:# (internal/readme/tags.go new)
```go
ctx, err = tag.New(ctx,
tag.Insert(osKey, "macOS-10.12.5"),
tag.Upsert(userIDKey, "cde36753ed"),
)
if err != nil {
log.Fatal(err)
}
```
## Stats
OpenCensus is a low-overhead framework even if instrumentation is always enabled.
In order to be so, it is optimized to make recording of data points fast
and separate from the data aggregation.
OpenCensus stats collection happens in two stages:
* Definition of measures and recording of data points
* Definition of views and aggregation of the recorded data
### Recording
Measurements are data points associated with a measure.
Recording implicitly tags the set of Measurements with the tags from the
provided context:
[embedmd]:# (internal/readme/stats.go record)
```go
stats.Record(ctx, videoSize.M(102478))
```
### Views
Views are how Measures are aggregated. You can think of them as queries over the
set of recorded data points (measurements).
Views have two parts: the tags to group by and the aggregation type used.
Currently three types of aggregations are supported:
* CountAggregation is used to count the number of times a sample was recorded.
* DistributionAggregation is used to provide a histogram of the values of the samples.
* SumAggregation is used to sum up all sample values.
[embedmd]:# (internal/readme/stats.go aggs)
```go
distAgg := view.Distribution(1<<32, 2<<32, 3<<32)
countAgg := view.Count()
sumAgg := view.Sum()
```
Here we create a view with the DistributionAggregation over our measure.
[embedmd]:# (internal/readme/stats.go view)
```go
if err := view.Register(&view.View{
Name: "example.com/video_size_distribution",
Description: "distribution of processed video size over time",
Measure: videoSize,
Aggregation: view.Distribution(1<<32, 2<<32, 3<<32),
}); err != nil {
log.Fatalf("Failed to register view: %v", err)
}
```
Register begins collecting data for the view. Registered views' data will be
exported via the registered exporters.
## Traces
A distributed trace tracks the progression of a single user request as
it is handled by the services and processes that make up an application.
Each step is called a span in the trace. Spans include metadata about the step,
including especially the time spent in the step, called the span’s latency.
Below you see a trace and several spans underneath it.
![Traces and spans](https://i.imgur.com/7hZwRVj.png)
### Spans
Span is the unit step in a trace. Each span has a name, latency, status and
additional metadata.
Below we are starting a span for a cache read and ending it
when we are done:
[embedmd]:# (internal/readme/trace.go startend)
```go
ctx, span := trace.StartSpan(ctx, "cache.Get")
defer span.End()
// Do work to get from cache.
```
### Propagation
Spans can have parents or can be root spans if they don't have any parents.
The current span is propagated in-process and across the network to allow associating
new child spans with the parent.
In the same process, `context.Context` is used to propagate spans.
`trace.StartSpan` creates a new span as a root if the current context
doesn't contain a span. Or, it creates a child of the span that is
already in current context. The returned context can be used to keep
propagating the newly created span in the current context.
[embedmd]:# (internal/readme/trace.go startend)
```go
ctx, span := trace.StartSpan(ctx, "cache.Get")
defer span.End()
// Do work to get from cache.
```
Across the network, OpenCensus provides different propagation
methods for different protocols.
* gRPC integrations use the OpenCensus' [binary propagation format](https://godoc.org/go.opencensus.io/trace/propagation).
* HTTP integrations use Zipkin's [B3](https://github.com/openzipkin/b3-propagation)
by default but can be configured to use a custom propagation method by setting another
[propagation.HTTPFormat](https://godoc.org/go.opencensus.io/trace/propagation#HTTPFormat).
## Execution Tracer
With Go 1.11, OpenCensus Go will support integration with the Go execution tracer.
See [Debugging Latency in Go](https://medium.com/observability/debugging-latency-in-go-1-11-9f97a7910d68)
for an example of their mutual use.
## Profiles
OpenCensus tags can be applied as profiler labels
for users who are on Go 1.9 and above.
[embedmd]:# (internal/readme/tags.go profiler)
```go
ctx, err = tag.New(ctx,
tag.Insert(osKey, "macOS-10.12.5"),
tag.Insert(userIDKey, "fff0989878"),
)
if err != nil {
log.Fatal(err)
}
tag.Do(ctx, func(ctx context.Context) {
// Do work.
// When profiling is on, samples will be
// recorded with the key/values from the tag map.
})
```
A screenshot of the CPU profile from the program above:
![CPU profile](https://i.imgur.com/jBKjlkw.png)
## Deprecation Policy
Before version 1.0.0, the following deprecation policy will be observed:
No backwards-incompatible changes will be made except for the removal of symbols that have
been marked as *Deprecated* for at least one minor release (e.g. 0.9.0 to 0.10.0). A release
removing the *Deprecated* functionality will be made no sooner than 28 days after the first
release in which the functionality was marked *Deprecated*.
[travis-image]: https://travis-ci.org/census-instrumentation/opencensus-go.svg?branch=master
[travis-url]: https://travis-ci.org/census-instrumentation/opencensus-go
[appveyor-image]: https://ci.appveyor.com/api/projects/status/vgtt29ps1783ig38?svg=true
[appveyor-url]: https://ci.appveyor.com/project/opencensusgoteam/opencensus-go/branch/master
[godoc-image]: https://godoc.org/go.opencensus.io?status.svg
[godoc-url]: https://godoc.org/go.opencensus.io
[gitter-image]: https://badges.gitter.im/census-instrumentation/lobby.svg
[gitter-url]: https://gitter.im/census-instrumentation/lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
[new-ex]: https://godoc.org/go.opencensus.io/tag#example-NewMap
[new-replace-ex]: https://godoc.org/go.opencensus.io/tag#example-NewMap--Replace
[exporter-prom]: https://godoc.org/go.opencensus.io/exporter/prometheus
[exporter-stackdriver]: https://godoc.org/contrib.go.opencensus.io/exporter/stackdriver
[exporter-zipkin]: https://godoc.org/go.opencensus.io/exporter/zipkin
[exporter-jaeger]: https://godoc.org/go.opencensus.io/exporter/jaeger
[exporter-xray]: https://github.com/census-ecosystem/opencensus-go-exporter-aws
[exporter-datadog]: https://github.com/DataDog/opencensus-go-exporter-datadog
[exporter-graphite]: https://github.com/census-ecosystem/opencensus-go-exporter-graphite
[exporter-honeycomb]: https://github.com/honeycombio/opencensus-exporter

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@ -0,0 +1,25 @@
version: "{build}"
platform: x64
clone_folder: c:\gopath\src\go.opencensus.io
environment:
GOPATH: 'c:\gopath'
GOVERSION: '1.11'
GO111MODULE: 'on'
CGO_ENABLED: '0' # See: https://github.com/appveyor/ci/issues/2613
install:
- set PATH=%GOPATH%\bin;c:\go\bin;%PATH%
- choco upgrade golang --version 1.11.5 # Temporary fix because of a go.sum bug in 1.11
- go version
- go env
build: false
deploy: false
test_script:
- cd %APPVEYOR_BUILD_FOLDER%
- go build -v .\...
- go test -v .\... # No -race because cgo is disabled

10
vendor/go.opencensus.io/go.mod generated vendored Normal file
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@ -0,0 +1,10 @@
module go.opencensus.io
require (
github.com/golang/protobuf v1.2.0
github.com/google/go-cmp v0.2.0
github.com/hashicorp/golang-lru v0.5.0
golang.org/x/net v0.0.0-20190311183353-d8887717615a
google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19 // indirect
google.golang.org/grpc v1.19.0
)

50
vendor/go.opencensus.io/go.sum generated vendored Normal file
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@ -0,0 +1,50 @@
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
github.com/hashicorp/golang-lru v0.5.0 h1:CL2msUPvZTLb5O648aiLNJw3hnBxN2+1Jq8rCOH9wdo=
github.com/hashicorp/golang-lru v0.5.0 h1:CL2msUPvZTLb5O648aiLNJw3hnBxN2+1Jq8rCOH9wdo=
github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190311183353-d8887717615a h1:oWX7TPOiFAMXLq8o0ikBYfCJVlRHBcsciT5bXOrH628=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20181108010431-42b317875d0f h1:Bl/8QSvNqXvPGPGXa2z5xUTmV7VDcZyvRZ+QQXkXTZQ=
golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6 h1:bjcUS9ztw9kFmmIxJInhon/0Is3p+EHBKNgquIzo1OI=
golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8 h1:Nw54tB0rB7hY/N0NQvRW8DG4Yk3Q6T9cu9RcFQDu1tc=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19 h1:Lj2SnHtxkRGJDqnGaSjo+CCdIieEnwVazbOXILwQemk=
google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/grpc v1.19.0 h1:cfg4PD8YEdSFnm7qLV4++93WcmhH2nIUhMjhdCvl3j8=
google.golang.org/grpc v1.19.0 h1:cfg4PD8YEdSFnm7qLV4++93WcmhH2nIUhMjhdCvl3j8=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

37
vendor/go.opencensus.io/internal/internal.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package internal // import "go.opencensus.io/internal"
import (
"fmt"
"time"
opencensus "go.opencensus.io"
)
// UserAgent is the user agent to be added to the outgoing
// requests from the exporters.
var UserAgent = fmt.Sprintf("opencensus-go/%s", opencensus.Version())
// MonotonicEndTime returns the end time at present
// but offset from start, monotonically.
//
// The monotonic clock is used in subtractions hence
// the duration since start added back to start gives
// end as a monotonic time.
// See https://golang.org/pkg/time/#hdr-Monotonic_Clocks
func MonotonicEndTime(start time.Time) time.Time {
return start.Add(time.Now().Sub(start))
}

50
vendor/go.opencensus.io/internal/sanitize.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package internal
import (
"strings"
"unicode"
)
const labelKeySizeLimit = 100
// Sanitize returns a string that is trunacated to 100 characters if it's too
// long, and replaces non-alphanumeric characters to underscores.
func Sanitize(s string) string {
if len(s) == 0 {
return s
}
if len(s) > labelKeySizeLimit {
s = s[:labelKeySizeLimit]
}
s = strings.Map(sanitizeRune, s)
if unicode.IsDigit(rune(s[0])) {
s = "key_" + s
}
if s[0] == '_' {
s = "key" + s
}
return s
}
// converts anything that is not a letter or digit to an underscore
func sanitizeRune(r rune) rune {
if unicode.IsLetter(r) || unicode.IsDigit(r) {
return r
}
// Everything else turns into an underscore
return '_'
}

75
vendor/go.opencensus.io/internal/tagencoding/tagencoding.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Package tagencoding contains the tag encoding
// used interally by the stats collector.
package tagencoding // import "go.opencensus.io/internal/tagencoding"
// Values represent the encoded buffer for the values.
type Values struct {
Buffer []byte
WriteIndex int
ReadIndex int
}
func (vb *Values) growIfRequired(expected int) {
if len(vb.Buffer)-vb.WriteIndex < expected {
tmp := make([]byte, 2*(len(vb.Buffer)+1)+expected)
copy(tmp, vb.Buffer)
vb.Buffer = tmp
}
}
// WriteValue is the helper method to encode Values from map[Key][]byte.
func (vb *Values) WriteValue(v []byte) {
length := len(v) & 0xff
vb.growIfRequired(1 + length)
// writing length of v
vb.Buffer[vb.WriteIndex] = byte(length)
vb.WriteIndex++
if length == 0 {
// No value was encoded for this key
return
}
// writing v
copy(vb.Buffer[vb.WriteIndex:], v[:length])
vb.WriteIndex += length
}
// ReadValue is the helper method to decode Values to a map[Key][]byte.
func (vb *Values) ReadValue() []byte {
// read length of v
length := int(vb.Buffer[vb.ReadIndex])
vb.ReadIndex++
if length == 0 {
// No value was encoded for this key
return nil
}
// read value of v
v := make([]byte, length)
endIdx := vb.ReadIndex + length
copy(v, vb.Buffer[vb.ReadIndex:endIdx])
vb.ReadIndex = endIdx
return v
}
// Bytes returns a reference to already written bytes in the Buffer.
func (vb *Values) Bytes() []byte {
return vb.Buffer[:vb.WriteIndex]
}

53
vendor/go.opencensus.io/internal/traceinternals.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package internal
import (
"time"
)
// Trace allows internal access to some trace functionality.
// TODO(#412): remove this
var Trace interface{}
// LocalSpanStoreEnabled true if the local span store is enabled.
var LocalSpanStoreEnabled bool
// BucketConfiguration stores the number of samples to store for span buckets
// for successful and failed spans for a particular span name.
type BucketConfiguration struct {
Name string
MaxRequestsSucceeded int
MaxRequestsErrors int
}
// PerMethodSummary is a summary of the spans stored for a single span name.
type PerMethodSummary struct {
Active int
LatencyBuckets []LatencyBucketSummary
ErrorBuckets []ErrorBucketSummary
}
// LatencyBucketSummary is a summary of a latency bucket.
type LatencyBucketSummary struct {
MinLatency, MaxLatency time.Duration
Size int
}
// ErrorBucketSummary is a summary of an error bucket.
type ErrorBucketSummary struct {
ErrorCode int32
Size int
}

19
vendor/go.opencensus.io/metric/metricdata/doc.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package metricdata contains the metrics data model.
//
// This is an EXPERIMENTAL package, and may change in arbitrary ways without
// notice.
package metricdata // import "go.opencensus.io/metric/metricdata"

38
vendor/go.opencensus.io/metric/metricdata/exemplar.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package metricdata
import (
"time"
)
// Exemplars keys.
const (
AttachmentKeySpanContext = "SpanContext"
)
// Exemplar is an example data point associated with each bucket of a
// distribution type aggregation.
//
// Their purpose is to provide an example of the kind of thing
// (request, RPC, trace span, etc.) that resulted in that measurement.
type Exemplar struct {
Value float64 // the value that was recorded
Timestamp time.Time // the time the value was recorded
Attachments Attachments // attachments (if any)
}
// Attachments is a map of extra values associated with a recorded data point.
type Attachments map[string]interface{}

35
vendor/go.opencensus.io/metric/metricdata/label.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package metricdata
// LabelKey represents key of a label. It has optional
// description attribute.
type LabelKey struct {
Key string
Description string
}
// LabelValue represents the value of a label.
// The zero value represents a missing label value, which may be treated
// differently to an empty string value by some back ends.
type LabelValue struct {
Value string // string value of the label
Present bool // flag that indicated whether a value is present or not
}
// NewLabelValue creates a new non-nil LabelValue that represents the given string.
func NewLabelValue(val string) LabelValue {
return LabelValue{Value: val, Present: true}
}

46
vendor/go.opencensus.io/metric/metricdata/metric.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package metricdata
import (
"time"
"go.opencensus.io/resource"
)
// Descriptor holds metadata about a metric.
type Descriptor struct {
Name string // full name of the metric
Description string // human-readable description
Unit Unit // units for the measure
Type Type // type of measure
LabelKeys []LabelKey // label keys
}
// Metric represents a quantity measured against a resource with different
// label value combinations.
type Metric struct {
Descriptor Descriptor // metric descriptor
Resource *resource.Resource // resource against which this was measured
TimeSeries []*TimeSeries // one time series for each combination of label values
}
// TimeSeries is a sequence of points associated with a combination of label
// values.
type TimeSeries struct {
LabelValues []LabelValue // label values, same order as keys in the metric descriptor
Points []Point // points sequence
StartTime time.Time // time we started recording this time series
}

193
vendor/go.opencensus.io/metric/metricdata/point.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package metricdata
import (
"time"
)
// Point is a single data point of a time series.
type Point struct {
// Time is the point in time that this point represents in a time series.
Time time.Time
// Value is the value of this point. Prefer using ReadValue to switching on
// the value type, since new value types might be added.
Value interface{}
}
//go:generate stringer -type ValueType
// NewFloat64Point creates a new Point holding a float64 value.
func NewFloat64Point(t time.Time, val float64) Point {
return Point{
Value: val,
Time: t,
}
}
// NewInt64Point creates a new Point holding an int64 value.
func NewInt64Point(t time.Time, val int64) Point {
return Point{
Value: val,
Time: t,
}
}
// NewDistributionPoint creates a new Point holding a Distribution value.
func NewDistributionPoint(t time.Time, val *Distribution) Point {
return Point{
Value: val,
Time: t,
}
}
// NewSummaryPoint creates a new Point holding a Summary value.
func NewSummaryPoint(t time.Time, val *Summary) Point {
return Point{
Value: val,
Time: t,
}
}
// ValueVisitor allows reading the value of a point.
type ValueVisitor interface {
VisitFloat64Value(float64)
VisitInt64Value(int64)
VisitDistributionValue(*Distribution)
VisitSummaryValue(*Summary)
}
// ReadValue accepts a ValueVisitor and calls the appropriate method with the
// value of this point.
// Consumers of Point should use this in preference to switching on the type
// of the value directly, since new value types may be added.
func (p Point) ReadValue(vv ValueVisitor) {
switch v := p.Value.(type) {
case int64:
vv.VisitInt64Value(v)
case float64:
vv.VisitFloat64Value(v)
case *Distribution:
vv.VisitDistributionValue(v)
case *Summary:
vv.VisitSummaryValue(v)
default:
panic("unexpected value type")
}
}
// Distribution contains summary statistics for a population of values. It
// optionally contains a histogram representing the distribution of those
// values across a set of buckets.
type Distribution struct {
// Count is the number of values in the population. Must be non-negative. This value
// must equal the sum of the values in bucket_counts if a histogram is
// provided.
Count int64
// Sum is the sum of the values in the population. If count is zero then this field
// must be zero.
Sum float64
// SumOfSquaredDeviation is the sum of squared deviations from the mean of the values in the
// population. For values x_i this is:
//
// Sum[i=1..n]((x_i - mean)^2)
//
// Knuth, "The Art of Computer Programming", Vol. 2, page 323, 3rd edition
// describes Welford's method for accumulating this sum in one pass.
//
// If count is zero then this field must be zero.
SumOfSquaredDeviation float64
// BucketOptions describes the bounds of the histogram buckets in this
// distribution.
//
// A Distribution may optionally contain a histogram of the values in the
// population.
//
// If nil, there is no associated histogram.
BucketOptions *BucketOptions
// Bucket If the distribution does not have a histogram, then omit this field.
// If there is a histogram, then the sum of the values in the Bucket counts
// must equal the value in the count field of the distribution.
Buckets []Bucket
}
// BucketOptions describes the bounds of the histogram buckets in this
// distribution.
type BucketOptions struct {
// Bounds specifies a set of bucket upper bounds.
// This defines len(bounds) + 1 (= N) buckets. The boundaries for bucket
// index i are:
//
// [0, Bounds[i]) for i == 0
// [Bounds[i-1], Bounds[i]) for 0 < i < N-1
// [Bounds[i-1], +infinity) for i == N-1
Bounds []float64
}
// Bucket represents a single bucket (value range) in a distribution.
type Bucket struct {
// Count is the number of values in each bucket of the histogram, as described in
// bucket_bounds.
Count int64
// Exemplar associated with this bucket (if any).
Exemplar *Exemplar
}
// Summary is a representation of percentiles.
type Summary struct {
// Count is the cumulative count (if available).
Count int64
// Sum is the cumulative sum of values (if available).
Sum float64
// HasCountAndSum is true if Count and Sum are available.
HasCountAndSum bool
// Snapshot represents percentiles calculated over an arbitrary time window.
// The values in this struct can be reset at arbitrary unknown times, with
// the requirement that all of them are reset at the same time.
Snapshot Snapshot
}
// Snapshot represents percentiles over an arbitrary time.
// The values in this struct can be reset at arbitrary unknown times, with
// the requirement that all of them are reset at the same time.
type Snapshot struct {
// Count is the number of values in the snapshot. Optional since some systems don't
// expose this. Set to 0 if not available.
Count int64
// Sum is the sum of values in the snapshot. Optional since some systems don't
// expose this. If count is 0 then this field must be zero.
Sum float64
// Percentiles is a map from percentile (range (0-100.0]) to the value of
// the percentile.
Percentiles map[float64]float64
}
//go:generate stringer -type Type
// Type is the overall type of metric, including its value type and whether it
// represents a cumulative total (since the start time) or if it represents a
// gauge value.
type Type int
// Metric types.
const (
TypeGaugeInt64 Type = iota
TypeGaugeFloat64
TypeGaugeDistribution
TypeCumulativeInt64
TypeCumulativeFloat64
TypeCumulativeDistribution
TypeSummary
)

16
vendor/go.opencensus.io/metric/metricdata/type_string.go generated vendored Normal file
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// Code generated by "stringer -type Type"; DO NOT EDIT.
package metricdata
import "strconv"
const _Type_name = "TypeGaugeInt64TypeGaugeFloat64TypeGaugeDistributionTypeCumulativeInt64TypeCumulativeFloat64TypeCumulativeDistributionTypeSummary"
var _Type_index = [...]uint8{0, 14, 30, 51, 70, 91, 117, 128}
func (i Type) String() string {
if i < 0 || i >= Type(len(_Type_index)-1) {
return "Type(" + strconv.FormatInt(int64(i), 10) + ")"
}
return _Type_name[_Type_index[i]:_Type_index[i+1]]
}

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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package metricdata
// Unit is a string encoded according to the case-sensitive abbreviations from the
// Unified Code for Units of Measure: http://unitsofmeasure.org/ucum.html
type Unit string
// Predefined units. To record against a unit not represented here, create your
// own Unit type constant from a string.
const (
UnitDimensionless Unit = "1"
UnitBytes Unit = "By"
UnitMilliseconds Unit = "ms"
)

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// Copyright 2019, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package metricproducer
import (
"sync"
)
// Manager maintains a list of active producers. Producers can register
// with the manager to allow readers to read all metrics provided by them.
// Readers can retrieve all producers registered with the manager,
// read metrics from the producers and export them.
type Manager struct {
mu sync.RWMutex
producers map[Producer]struct{}
}
var prodMgr *Manager
var once sync.Once
// GlobalManager is a single instance of producer manager
// that is used by all producers and all readers.
func GlobalManager() *Manager {
once.Do(func() {
prodMgr = &Manager{}
prodMgr.producers = make(map[Producer]struct{})
})
return prodMgr
}
// AddProducer adds the producer to the Manager if it is not already present.
func (pm *Manager) AddProducer(producer Producer) {
if producer == nil {
return
}
pm.mu.Lock()
defer pm.mu.Unlock()
pm.producers[producer] = struct{}{}
}
// DeleteProducer deletes the producer from the Manager if it is present.
func (pm *Manager) DeleteProducer(producer Producer) {
if producer == nil {
return
}
pm.mu.Lock()
defer pm.mu.Unlock()
delete(pm.producers, producer)
}
// GetAll returns a slice of all producer currently registered with
// the Manager. For each call it generates a new slice. The slice
// should not be cached as registration may change at any time. It is
// typically called periodically by exporter to read metrics from
// the producers.
func (pm *Manager) GetAll() []Producer {
pm.mu.Lock()
defer pm.mu.Unlock()
producers := make([]Producer, len(pm.producers))
i := 0
for producer := range pm.producers {
producers[i] = producer
i++
}
return producers
}

28
vendor/go.opencensus.io/metric/metricproducer/producer.go generated vendored Normal file
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// Copyright 2019, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package metricproducer
import (
"go.opencensus.io/metric/metricdata"
)
// Producer is a source of metrics.
type Producer interface {
// Read should return the current values of all metrics supported by this
// metric provider.
// The returned metrics should be unique for each combination of name and
// resource.
Read() []*metricdata.Metric
}

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vendor/go.opencensus.io/opencensus.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package opencensus contains Go support for OpenCensus.
package opencensus // import "go.opencensus.io"
// Version is the current release version of OpenCensus in use.
func Version() string {
return "0.21.0"
}

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vendor/go.opencensus.io/plugin/ochttp/client.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ochttp
import (
"net/http"
"net/http/httptrace"
"go.opencensus.io/trace"
"go.opencensus.io/trace/propagation"
)
// Transport is an http.RoundTripper that instruments all outgoing requests with
// OpenCensus stats and tracing.
//
// The zero value is intended to be a useful default, but for
// now it's recommended that you explicitly set Propagation, since the default
// for this may change.
type Transport struct {
// Base may be set to wrap another http.RoundTripper that does the actual
// requests. By default http.DefaultTransport is used.
//
// If base HTTP roundtripper implements CancelRequest,
// the returned round tripper will be cancelable.
Base http.RoundTripper
// Propagation defines how traces are propagated. If unspecified, a default
// (currently B3 format) will be used.
Propagation propagation.HTTPFormat
// StartOptions are applied to the span started by this Transport around each
// request.
//
// StartOptions.SpanKind will always be set to trace.SpanKindClient
// for spans started by this transport.
StartOptions trace.StartOptions
// GetStartOptions allows to set start options per request. If set,
// StartOptions is going to be ignored.
GetStartOptions func(*http.Request) trace.StartOptions
// NameFromRequest holds the function to use for generating the span name
// from the information found in the outgoing HTTP Request. By default the
// name equals the URL Path.
FormatSpanName func(*http.Request) string
// NewClientTrace may be set to a function allowing the current *trace.Span
// to be annotated with HTTP request event information emitted by the
// httptrace package.
NewClientTrace func(*http.Request, *trace.Span) *httptrace.ClientTrace
// TODO: Implement tag propagation for HTTP.
}
// RoundTrip implements http.RoundTripper, delegating to Base and recording stats and traces for the request.
func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error) {
rt := t.base()
if isHealthEndpoint(req.URL.Path) {
return rt.RoundTrip(req)
}
// TODO: remove excessive nesting of http.RoundTrippers here.
format := t.Propagation
if format == nil {
format = defaultFormat
}
spanNameFormatter := t.FormatSpanName
if spanNameFormatter == nil {
spanNameFormatter = spanNameFromURL
}
startOpts := t.StartOptions
if t.GetStartOptions != nil {
startOpts = t.GetStartOptions(req)
}
rt = &traceTransport{
base: rt,
format: format,
startOptions: trace.StartOptions{
Sampler: startOpts.Sampler,
SpanKind: trace.SpanKindClient,
},
formatSpanName: spanNameFormatter,
newClientTrace: t.NewClientTrace,
}
rt = statsTransport{base: rt}
return rt.RoundTrip(req)
}
func (t *Transport) base() http.RoundTripper {
if t.Base != nil {
return t.Base
}
return http.DefaultTransport
}
// CancelRequest cancels an in-flight request by closing its connection.
func (t *Transport) CancelRequest(req *http.Request) {
type canceler interface {
CancelRequest(*http.Request)
}
if cr, ok := t.base().(canceler); ok {
cr.CancelRequest(req)
}
}

143
vendor/go.opencensus.io/plugin/ochttp/client_stats.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ochttp
import (
"context"
"io"
"net/http"
"strconv"
"sync"
"time"
"go.opencensus.io/stats"
"go.opencensus.io/tag"
)
// statsTransport is an http.RoundTripper that collects stats for the outgoing requests.
type statsTransport struct {
base http.RoundTripper
}
// RoundTrip implements http.RoundTripper, delegating to Base and recording stats for the request.
func (t statsTransport) RoundTrip(req *http.Request) (*http.Response, error) {
ctx, _ := tag.New(req.Context(),
tag.Upsert(KeyClientHost, req.Host),
tag.Upsert(Host, req.Host),
tag.Upsert(KeyClientPath, req.URL.Path),
tag.Upsert(Path, req.URL.Path),
tag.Upsert(KeyClientMethod, req.Method),
tag.Upsert(Method, req.Method))
req = req.WithContext(ctx)
track := &tracker{
start: time.Now(),
ctx: ctx,
}
if req.Body == nil {
// TODO: Handle cases where ContentLength is not set.
track.reqSize = -1
} else if req.ContentLength > 0 {
track.reqSize = req.ContentLength
}
stats.Record(ctx, ClientRequestCount.M(1))
// Perform request.
resp, err := t.base.RoundTrip(req)
if err != nil {
track.statusCode = http.StatusInternalServerError
track.end()
} else {
track.statusCode = resp.StatusCode
if req.Method != "HEAD" {
track.respContentLength = resp.ContentLength
}
if resp.Body == nil {
track.end()
} else {
track.body = resp.Body
resp.Body = wrappedBody(track, resp.Body)
}
}
return resp, err
}
// CancelRequest cancels an in-flight request by closing its connection.
func (t statsTransport) CancelRequest(req *http.Request) {
type canceler interface {
CancelRequest(*http.Request)
}
if cr, ok := t.base.(canceler); ok {
cr.CancelRequest(req)
}
}
type tracker struct {
ctx context.Context
respSize int64
respContentLength int64
reqSize int64
start time.Time
body io.ReadCloser
statusCode int
endOnce sync.Once
}
var _ io.ReadCloser = (*tracker)(nil)
func (t *tracker) end() {
t.endOnce.Do(func() {
latencyMs := float64(time.Since(t.start)) / float64(time.Millisecond)
respSize := t.respSize
if t.respSize == 0 && t.respContentLength > 0 {
respSize = t.respContentLength
}
m := []stats.Measurement{
ClientSentBytes.M(t.reqSize),
ClientReceivedBytes.M(respSize),
ClientRoundtripLatency.M(latencyMs),
ClientLatency.M(latencyMs),
ClientResponseBytes.M(t.respSize),
}
if t.reqSize >= 0 {
m = append(m, ClientRequestBytes.M(t.reqSize))
}
stats.RecordWithTags(t.ctx, []tag.Mutator{
tag.Upsert(StatusCode, strconv.Itoa(t.statusCode)),
tag.Upsert(KeyClientStatus, strconv.Itoa(t.statusCode)),
}, m...)
})
}
func (t *tracker) Read(b []byte) (int, error) {
n, err := t.body.Read(b)
t.respSize += int64(n)
switch err {
case nil:
return n, nil
case io.EOF:
t.end()
}
return n, err
}
func (t *tracker) Close() error {
// Invoking endSpan on Close will help catch the cases
// in which a read returned a non-nil error, we set the
// span status but didn't end the span.
t.end()
return t.body.Close()
}

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vendor/go.opencensus.io/plugin/ochttp/doc.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package ochttp provides OpenCensus instrumentation for net/http package.
//
// For server instrumentation, see Handler. For client-side instrumentation,
// see Transport.
package ochttp // import "go.opencensus.io/plugin/ochttp"

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vendor/go.opencensus.io/plugin/ochttp/propagation/b3/b3.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package b3 contains a propagation.HTTPFormat implementation
// for B3 propagation. See https://github.com/openzipkin/b3-propagation
// for more details.
package b3 // import "go.opencensus.io/plugin/ochttp/propagation/b3"
import (
"encoding/hex"
"net/http"
"go.opencensus.io/trace"
"go.opencensus.io/trace/propagation"
)
// B3 headers that OpenCensus understands.
const (
TraceIDHeader = "X-B3-TraceId"
SpanIDHeader = "X-B3-SpanId"
SampledHeader = "X-B3-Sampled"
)
// HTTPFormat implements propagation.HTTPFormat to propagate
// traces in HTTP headers in B3 propagation format.
// HTTPFormat skips the X-B3-ParentId and X-B3-Flags headers
// because there are additional fields not represented in the
// OpenCensus span context. Spans created from the incoming
// header will be the direct children of the client-side span.
// Similarly, receiver of the outgoing spans should use client-side
// span created by OpenCensus as the parent.
type HTTPFormat struct{}
var _ propagation.HTTPFormat = (*HTTPFormat)(nil)
// SpanContextFromRequest extracts a B3 span context from incoming requests.
func (f *HTTPFormat) SpanContextFromRequest(req *http.Request) (sc trace.SpanContext, ok bool) {
tid, ok := ParseTraceID(req.Header.Get(TraceIDHeader))
if !ok {
return trace.SpanContext{}, false
}
sid, ok := ParseSpanID(req.Header.Get(SpanIDHeader))
if !ok {
return trace.SpanContext{}, false
}
sampled, _ := ParseSampled(req.Header.Get(SampledHeader))
return trace.SpanContext{
TraceID: tid,
SpanID: sid,
TraceOptions: sampled,
}, true
}
// ParseTraceID parses the value of the X-B3-TraceId header.
func ParseTraceID(tid string) (trace.TraceID, bool) {
if tid == "" {
return trace.TraceID{}, false
}
b, err := hex.DecodeString(tid)
if err != nil {
return trace.TraceID{}, false
}
var traceID trace.TraceID
if len(b) <= 8 {
// The lower 64-bits.
start := 8 + (8 - len(b))
copy(traceID[start:], b)
} else {
start := 16 - len(b)
copy(traceID[start:], b)
}
return traceID, true
}
// ParseSpanID parses the value of the X-B3-SpanId or X-B3-ParentSpanId headers.
func ParseSpanID(sid string) (spanID trace.SpanID, ok bool) {
if sid == "" {
return trace.SpanID{}, false
}
b, err := hex.DecodeString(sid)
if err != nil {
return trace.SpanID{}, false
}
start := 8 - len(b)
copy(spanID[start:], b)
return spanID, true
}
// ParseSampled parses the value of the X-B3-Sampled header.
func ParseSampled(sampled string) (trace.TraceOptions, bool) {
switch sampled {
case "true", "1":
return trace.TraceOptions(1), true
default:
return trace.TraceOptions(0), false
}
}
// SpanContextToRequest modifies the given request to include B3 headers.
func (f *HTTPFormat) SpanContextToRequest(sc trace.SpanContext, req *http.Request) {
req.Header.Set(TraceIDHeader, hex.EncodeToString(sc.TraceID[:]))
req.Header.Set(SpanIDHeader, hex.EncodeToString(sc.SpanID[:]))
var sampled string
if sc.IsSampled() {
sampled = "1"
} else {
sampled = "0"
}
req.Header.Set(SampledHeader, sampled)
}

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vendor/go.opencensus.io/plugin/ochttp/route.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ochttp
import (
"context"
"net/http"
"go.opencensus.io/tag"
)
// SetRoute sets the http_server_route tag to the given value.
// It's useful when an HTTP framework does not support the http.Handler interface
// and using WithRouteTag is not an option, but provides a way to hook into the request flow.
func SetRoute(ctx context.Context, route string) {
if a, ok := ctx.Value(addedTagsKey{}).(*addedTags); ok {
a.t = append(a.t, tag.Upsert(KeyServerRoute, route))
}
}
// WithRouteTag returns an http.Handler that records stats with the
// http_server_route tag set to the given value.
func WithRouteTag(handler http.Handler, route string) http.Handler {
return taggedHandlerFunc(func(w http.ResponseWriter, r *http.Request) []tag.Mutator {
addRoute := []tag.Mutator{tag.Upsert(KeyServerRoute, route)}
ctx, _ := tag.New(r.Context(), addRoute...)
r = r.WithContext(ctx)
handler.ServeHTTP(w, r)
return addRoute
})
}
// taggedHandlerFunc is a http.Handler that returns tags describing the
// processing of the request. These tags will be recorded along with the
// measures in this package at the end of the request.
type taggedHandlerFunc func(w http.ResponseWriter, r *http.Request) []tag.Mutator
func (h taggedHandlerFunc) ServeHTTP(w http.ResponseWriter, r *http.Request) {
tags := h(w, r)
if a, ok := r.Context().Value(addedTagsKey{}).(*addedTags); ok {
a.t = append(a.t, tags...)
}
}
type addedTagsKey struct{}
type addedTags struct {
t []tag.Mutator
}

449
vendor/go.opencensus.io/plugin/ochttp/server.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ochttp
import (
"context"
"io"
"net/http"
"strconv"
"sync"
"time"
"go.opencensus.io/stats"
"go.opencensus.io/tag"
"go.opencensus.io/trace"
"go.opencensus.io/trace/propagation"
)
// Handler is an http.Handler wrapper to instrument your HTTP server with
// OpenCensus. It supports both stats and tracing.
//
// Tracing
//
// This handler is aware of the incoming request's span, reading it from request
// headers as configured using the Propagation field.
// The extracted span can be accessed from the incoming request's
// context.
//
// span := trace.FromContext(r.Context())
//
// The server span will be automatically ended at the end of ServeHTTP.
type Handler struct {
// Propagation defines how traces are propagated. If unspecified,
// B3 propagation will be used.
Propagation propagation.HTTPFormat
// Handler is the handler used to handle the incoming request.
Handler http.Handler
// StartOptions are applied to the span started by this Handler around each
// request.
//
// StartOptions.SpanKind will always be set to trace.SpanKindServer
// for spans started by this transport.
StartOptions trace.StartOptions
// GetStartOptions allows to set start options per request. If set,
// StartOptions is going to be ignored.
GetStartOptions func(*http.Request) trace.StartOptions
// IsPublicEndpoint should be set to true for publicly accessible HTTP(S)
// servers. If true, any trace metadata set on the incoming request will
// be added as a linked trace instead of being added as a parent of the
// current trace.
IsPublicEndpoint bool
// FormatSpanName holds the function to use for generating the span name
// from the information found in the incoming HTTP Request. By default the
// name equals the URL Path.
FormatSpanName func(*http.Request) string
}
func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
var tags addedTags
r, traceEnd := h.startTrace(w, r)
defer traceEnd()
w, statsEnd := h.startStats(w, r)
defer statsEnd(&tags)
handler := h.Handler
if handler == nil {
handler = http.DefaultServeMux
}
r = r.WithContext(context.WithValue(r.Context(), addedTagsKey{}, &tags))
handler.ServeHTTP(w, r)
}
func (h *Handler) startTrace(w http.ResponseWriter, r *http.Request) (*http.Request, func()) {
if isHealthEndpoint(r.URL.Path) {
return r, func() {}
}
var name string
if h.FormatSpanName == nil {
name = spanNameFromURL(r)
} else {
name = h.FormatSpanName(r)
}
ctx := r.Context()
startOpts := h.StartOptions
if h.GetStartOptions != nil {
startOpts = h.GetStartOptions(r)
}
var span *trace.Span
sc, ok := h.extractSpanContext(r)
if ok && !h.IsPublicEndpoint {
ctx, span = trace.StartSpanWithRemoteParent(ctx, name, sc,
trace.WithSampler(startOpts.Sampler),
trace.WithSpanKind(trace.SpanKindServer))
} else {
ctx, span = trace.StartSpan(ctx, name,
trace.WithSampler(startOpts.Sampler),
trace.WithSpanKind(trace.SpanKindServer),
)
if ok {
span.AddLink(trace.Link{
TraceID: sc.TraceID,
SpanID: sc.SpanID,
Type: trace.LinkTypeParent,
Attributes: nil,
})
}
}
span.AddAttributes(requestAttrs(r)...)
if r.Body == nil {
// TODO: Handle cases where ContentLength is not set.
} else if r.ContentLength > 0 {
span.AddMessageReceiveEvent(0, /* TODO: messageID */
int64(r.ContentLength), -1)
}
return r.WithContext(ctx), span.End
}
func (h *Handler) extractSpanContext(r *http.Request) (trace.SpanContext, bool) {
if h.Propagation == nil {
return defaultFormat.SpanContextFromRequest(r)
}
return h.Propagation.SpanContextFromRequest(r)
}
func (h *Handler) startStats(w http.ResponseWriter, r *http.Request) (http.ResponseWriter, func(tags *addedTags)) {
ctx, _ := tag.New(r.Context(),
tag.Upsert(Host, r.Host),
tag.Upsert(Path, r.URL.Path),
tag.Upsert(Method, r.Method))
track := &trackingResponseWriter{
start: time.Now(),
ctx: ctx,
writer: w,
}
if r.Body == nil {
// TODO: Handle cases where ContentLength is not set.
track.reqSize = -1
} else if r.ContentLength > 0 {
track.reqSize = r.ContentLength
}
stats.Record(ctx, ServerRequestCount.M(1))
return track.wrappedResponseWriter(), track.end
}
type trackingResponseWriter struct {
ctx context.Context
reqSize int64
respSize int64
start time.Time
statusCode int
statusLine string
endOnce sync.Once
writer http.ResponseWriter
}
// Compile time assertion for ResponseWriter interface
var _ http.ResponseWriter = (*trackingResponseWriter)(nil)
var logTagsErrorOnce sync.Once
func (t *trackingResponseWriter) end(tags *addedTags) {
t.endOnce.Do(func() {
if t.statusCode == 0 {
t.statusCode = 200
}
span := trace.FromContext(t.ctx)
span.SetStatus(TraceStatus(t.statusCode, t.statusLine))
span.AddAttributes(trace.Int64Attribute(StatusCodeAttribute, int64(t.statusCode)))
m := []stats.Measurement{
ServerLatency.M(float64(time.Since(t.start)) / float64(time.Millisecond)),
ServerResponseBytes.M(t.respSize),
}
if t.reqSize >= 0 {
m = append(m, ServerRequestBytes.M(t.reqSize))
}
allTags := make([]tag.Mutator, len(tags.t)+1)
allTags[0] = tag.Upsert(StatusCode, strconv.Itoa(t.statusCode))
copy(allTags[1:], tags.t)
stats.RecordWithTags(t.ctx, allTags, m...)
})
}
func (t *trackingResponseWriter) Header() http.Header {
return t.writer.Header()
}
func (t *trackingResponseWriter) Write(data []byte) (int, error) {
n, err := t.writer.Write(data)
t.respSize += int64(n)
// Add message event for request bytes sent.
span := trace.FromContext(t.ctx)
span.AddMessageSendEvent(0 /* TODO: messageID */, int64(n), -1)
return n, err
}
func (t *trackingResponseWriter) WriteHeader(statusCode int) {
t.writer.WriteHeader(statusCode)
t.statusCode = statusCode
t.statusLine = http.StatusText(t.statusCode)
}
// wrappedResponseWriter returns a wrapped version of the original
// ResponseWriter and only implements the same combination of additional
// interfaces as the original.
// This implementation is based on https://github.com/felixge/httpsnoop.
func (t *trackingResponseWriter) wrappedResponseWriter() http.ResponseWriter {
var (
hj, i0 = t.writer.(http.Hijacker)
cn, i1 = t.writer.(http.CloseNotifier)
pu, i2 = t.writer.(http.Pusher)
fl, i3 = t.writer.(http.Flusher)
rf, i4 = t.writer.(io.ReaderFrom)
)
switch {
case !i0 && !i1 && !i2 && !i3 && !i4:
return struct {
http.ResponseWriter
}{t}
case !i0 && !i1 && !i2 && !i3 && i4:
return struct {
http.ResponseWriter
io.ReaderFrom
}{t, rf}
case !i0 && !i1 && !i2 && i3 && !i4:
return struct {
http.ResponseWriter
http.Flusher
}{t, fl}
case !i0 && !i1 && !i2 && i3 && i4:
return struct {
http.ResponseWriter
http.Flusher
io.ReaderFrom
}{t, fl, rf}
case !i0 && !i1 && i2 && !i3 && !i4:
return struct {
http.ResponseWriter
http.Pusher
}{t, pu}
case !i0 && !i1 && i2 && !i3 && i4:
return struct {
http.ResponseWriter
http.Pusher
io.ReaderFrom
}{t, pu, rf}
case !i0 && !i1 && i2 && i3 && !i4:
return struct {
http.ResponseWriter
http.Pusher
http.Flusher
}{t, pu, fl}
case !i0 && !i1 && i2 && i3 && i4:
return struct {
http.ResponseWriter
http.Pusher
http.Flusher
io.ReaderFrom
}{t, pu, fl, rf}
case !i0 && i1 && !i2 && !i3 && !i4:
return struct {
http.ResponseWriter
http.CloseNotifier
}{t, cn}
case !i0 && i1 && !i2 && !i3 && i4:
return struct {
http.ResponseWriter
http.CloseNotifier
io.ReaderFrom
}{t, cn, rf}
case !i0 && i1 && !i2 && i3 && !i4:
return struct {
http.ResponseWriter
http.CloseNotifier
http.Flusher
}{t, cn, fl}
case !i0 && i1 && !i2 && i3 && i4:
return struct {
http.ResponseWriter
http.CloseNotifier
http.Flusher
io.ReaderFrom
}{t, cn, fl, rf}
case !i0 && i1 && i2 && !i3 && !i4:
return struct {
http.ResponseWriter
http.CloseNotifier
http.Pusher
}{t, cn, pu}
case !i0 && i1 && i2 && !i3 && i4:
return struct {
http.ResponseWriter
http.CloseNotifier
http.Pusher
io.ReaderFrom
}{t, cn, pu, rf}
case !i0 && i1 && i2 && i3 && !i4:
return struct {
http.ResponseWriter
http.CloseNotifier
http.Pusher
http.Flusher
}{t, cn, pu, fl}
case !i0 && i1 && i2 && i3 && i4:
return struct {
http.ResponseWriter
http.CloseNotifier
http.Pusher
http.Flusher
io.ReaderFrom
}{t, cn, pu, fl, rf}
case i0 && !i1 && !i2 && !i3 && !i4:
return struct {
http.ResponseWriter
http.Hijacker
}{t, hj}
case i0 && !i1 && !i2 && !i3 && i4:
return struct {
http.ResponseWriter
http.Hijacker
io.ReaderFrom
}{t, hj, rf}
case i0 && !i1 && !i2 && i3 && !i4:
return struct {
http.ResponseWriter
http.Hijacker
http.Flusher
}{t, hj, fl}
case i0 && !i1 && !i2 && i3 && i4:
return struct {
http.ResponseWriter
http.Hijacker
http.Flusher
io.ReaderFrom
}{t, hj, fl, rf}
case i0 && !i1 && i2 && !i3 && !i4:
return struct {
http.ResponseWriter
http.Hijacker
http.Pusher
}{t, hj, pu}
case i0 && !i1 && i2 && !i3 && i4:
return struct {
http.ResponseWriter
http.Hijacker
http.Pusher
io.ReaderFrom
}{t, hj, pu, rf}
case i0 && !i1 && i2 && i3 && !i4:
return struct {
http.ResponseWriter
http.Hijacker
http.Pusher
http.Flusher
}{t, hj, pu, fl}
case i0 && !i1 && i2 && i3 && i4:
return struct {
http.ResponseWriter
http.Hijacker
http.Pusher
http.Flusher
io.ReaderFrom
}{t, hj, pu, fl, rf}
case i0 && i1 && !i2 && !i3 && !i4:
return struct {
http.ResponseWriter
http.Hijacker
http.CloseNotifier
}{t, hj, cn}
case i0 && i1 && !i2 && !i3 && i4:
return struct {
http.ResponseWriter
http.Hijacker
http.CloseNotifier
io.ReaderFrom
}{t, hj, cn, rf}
case i0 && i1 && !i2 && i3 && !i4:
return struct {
http.ResponseWriter
http.Hijacker
http.CloseNotifier
http.Flusher
}{t, hj, cn, fl}
case i0 && i1 && !i2 && i3 && i4:
return struct {
http.ResponseWriter
http.Hijacker
http.CloseNotifier
http.Flusher
io.ReaderFrom
}{t, hj, cn, fl, rf}
case i0 && i1 && i2 && !i3 && !i4:
return struct {
http.ResponseWriter
http.Hijacker
http.CloseNotifier
http.Pusher
}{t, hj, cn, pu}
case i0 && i1 && i2 && !i3 && i4:
return struct {
http.ResponseWriter
http.Hijacker
http.CloseNotifier
http.Pusher
io.ReaderFrom
}{t, hj, cn, pu, rf}
case i0 && i1 && i2 && i3 && !i4:
return struct {
http.ResponseWriter
http.Hijacker
http.CloseNotifier
http.Pusher
http.Flusher
}{t, hj, cn, pu, fl}
case i0 && i1 && i2 && i3 && i4:
return struct {
http.ResponseWriter
http.Hijacker
http.CloseNotifier
http.Pusher
http.Flusher
io.ReaderFrom
}{t, hj, cn, pu, fl, rf}
default:
return struct {
http.ResponseWriter
}{t}
}
}

169
vendor/go.opencensus.io/plugin/ochttp/span_annotating_client_trace.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ochttp
import (
"crypto/tls"
"net/http"
"net/http/httptrace"
"strings"
"go.opencensus.io/trace"
)
type spanAnnotator struct {
sp *trace.Span
}
// TODO: Remove NewSpanAnnotator at the next release.
// NewSpanAnnotator returns a httptrace.ClientTrace which annotates
// all emitted httptrace events on the provided Span.
// Deprecated: Use NewSpanAnnotatingClientTrace instead
func NewSpanAnnotator(r *http.Request, s *trace.Span) *httptrace.ClientTrace {
return NewSpanAnnotatingClientTrace(r, s)
}
// NewSpanAnnotatingClientTrace returns a httptrace.ClientTrace which annotates
// all emitted httptrace events on the provided Span.
func NewSpanAnnotatingClientTrace(_ *http.Request, s *trace.Span) *httptrace.ClientTrace {
sa := spanAnnotator{sp: s}
return &httptrace.ClientTrace{
GetConn: sa.getConn,
GotConn: sa.gotConn,
PutIdleConn: sa.putIdleConn,
GotFirstResponseByte: sa.gotFirstResponseByte,
Got100Continue: sa.got100Continue,
DNSStart: sa.dnsStart,
DNSDone: sa.dnsDone,
ConnectStart: sa.connectStart,
ConnectDone: sa.connectDone,
TLSHandshakeStart: sa.tlsHandshakeStart,
TLSHandshakeDone: sa.tlsHandshakeDone,
WroteHeaders: sa.wroteHeaders,
Wait100Continue: sa.wait100Continue,
WroteRequest: sa.wroteRequest,
}
}
func (s spanAnnotator) getConn(hostPort string) {
attrs := []trace.Attribute{
trace.StringAttribute("httptrace.get_connection.host_port", hostPort),
}
s.sp.Annotate(attrs, "GetConn")
}
func (s spanAnnotator) gotConn(info httptrace.GotConnInfo) {
attrs := []trace.Attribute{
trace.BoolAttribute("httptrace.got_connection.reused", info.Reused),
trace.BoolAttribute("httptrace.got_connection.was_idle", info.WasIdle),
}
if info.WasIdle {
attrs = append(attrs,
trace.StringAttribute("httptrace.got_connection.idle_time", info.IdleTime.String()))
}
s.sp.Annotate(attrs, "GotConn")
}
// PutIdleConn implements a httptrace.ClientTrace hook
func (s spanAnnotator) putIdleConn(err error) {
var attrs []trace.Attribute
if err != nil {
attrs = append(attrs,
trace.StringAttribute("httptrace.put_idle_connection.error", err.Error()))
}
s.sp.Annotate(attrs, "PutIdleConn")
}
func (s spanAnnotator) gotFirstResponseByte() {
s.sp.Annotate(nil, "GotFirstResponseByte")
}
func (s spanAnnotator) got100Continue() {
s.sp.Annotate(nil, "Got100Continue")
}
func (s spanAnnotator) dnsStart(info httptrace.DNSStartInfo) {
attrs := []trace.Attribute{
trace.StringAttribute("httptrace.dns_start.host", info.Host),
}
s.sp.Annotate(attrs, "DNSStart")
}
func (s spanAnnotator) dnsDone(info httptrace.DNSDoneInfo) {
var addrs []string
for _, addr := range info.Addrs {
addrs = append(addrs, addr.String())
}
attrs := []trace.Attribute{
trace.StringAttribute("httptrace.dns_done.addrs", strings.Join(addrs, " , ")),
}
if info.Err != nil {
attrs = append(attrs,
trace.StringAttribute("httptrace.dns_done.error", info.Err.Error()))
}
s.sp.Annotate(attrs, "DNSDone")
}
func (s spanAnnotator) connectStart(network, addr string) {
attrs := []trace.Attribute{
trace.StringAttribute("httptrace.connect_start.network", network),
trace.StringAttribute("httptrace.connect_start.addr", addr),
}
s.sp.Annotate(attrs, "ConnectStart")
}
func (s spanAnnotator) connectDone(network, addr string, err error) {
attrs := []trace.Attribute{
trace.StringAttribute("httptrace.connect_done.network", network),
trace.StringAttribute("httptrace.connect_done.addr", addr),
}
if err != nil {
attrs = append(attrs,
trace.StringAttribute("httptrace.connect_done.error", err.Error()))
}
s.sp.Annotate(attrs, "ConnectDone")
}
func (s spanAnnotator) tlsHandshakeStart() {
s.sp.Annotate(nil, "TLSHandshakeStart")
}
func (s spanAnnotator) tlsHandshakeDone(_ tls.ConnectionState, err error) {
var attrs []trace.Attribute
if err != nil {
attrs = append(attrs,
trace.StringAttribute("httptrace.tls_handshake_done.error", err.Error()))
}
s.sp.Annotate(attrs, "TLSHandshakeDone")
}
func (s spanAnnotator) wroteHeaders() {
s.sp.Annotate(nil, "WroteHeaders")
}
func (s spanAnnotator) wait100Continue() {
s.sp.Annotate(nil, "Wait100Continue")
}
func (s spanAnnotator) wroteRequest(info httptrace.WroteRequestInfo) {
var attrs []trace.Attribute
if info.Err != nil {
attrs = append(attrs,
trace.StringAttribute("httptrace.wrote_request.error", info.Err.Error()))
}
s.sp.Annotate(attrs, "WroteRequest")
}

292
vendor/go.opencensus.io/plugin/ochttp/stats.go generated vendored Normal file
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@ -0,0 +1,292 @@
// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ochttp
import (
"go.opencensus.io/stats"
"go.opencensus.io/stats/view"
"go.opencensus.io/tag"
)
// Deprecated: client HTTP measures.
var (
// Deprecated: Use a Count aggregation over one of the other client measures to achieve the same effect.
ClientRequestCount = stats.Int64(
"opencensus.io/http/client/request_count",
"Number of HTTP requests started",
stats.UnitDimensionless)
// Deprecated: Use ClientSentBytes.
ClientRequestBytes = stats.Int64(
"opencensus.io/http/client/request_bytes",
"HTTP request body size if set as ContentLength (uncompressed)",
stats.UnitBytes)
// Deprecated: Use ClientReceivedBytes.
ClientResponseBytes = stats.Int64(
"opencensus.io/http/client/response_bytes",
"HTTP response body size (uncompressed)",
stats.UnitBytes)
// Deprecated: Use ClientRoundtripLatency.
ClientLatency = stats.Float64(
"opencensus.io/http/client/latency",
"End-to-end latency",
stats.UnitMilliseconds)
)
// The following client HTTP measures are supported for use in custom views.
var (
ClientSentBytes = stats.Int64(
"opencensus.io/http/client/sent_bytes",
"Total bytes sent in request body (not including headers)",
stats.UnitBytes,
)
ClientReceivedBytes = stats.Int64(
"opencensus.io/http/client/received_bytes",
"Total bytes received in response bodies (not including headers but including error responses with bodies)",
stats.UnitBytes,
)
ClientRoundtripLatency = stats.Float64(
"opencensus.io/http/client/roundtrip_latency",
"Time between first byte of request headers sent to last byte of response received, or terminal error",
stats.UnitMilliseconds,
)
)
// The following server HTTP measures are supported for use in custom views:
var (
ServerRequestCount = stats.Int64(
"opencensus.io/http/server/request_count",
"Number of HTTP requests started",
stats.UnitDimensionless)
ServerRequestBytes = stats.Int64(
"opencensus.io/http/server/request_bytes",
"HTTP request body size if set as ContentLength (uncompressed)",
stats.UnitBytes)
ServerResponseBytes = stats.Int64(
"opencensus.io/http/server/response_bytes",
"HTTP response body size (uncompressed)",
stats.UnitBytes)
ServerLatency = stats.Float64(
"opencensus.io/http/server/latency",
"End-to-end latency",
stats.UnitMilliseconds)
)
// The following tags are applied to stats recorded by this package. Host, Path
// and Method are applied to all measures. StatusCode is not applied to
// ClientRequestCount or ServerRequestCount, since it is recorded before the status is known.
var (
// Host is the value of the HTTP Host header.
//
// The value of this tag can be controlled by the HTTP client, so you need
// to watch out for potentially generating high-cardinality labels in your
// metrics backend if you use this tag in views.
Host, _ = tag.NewKey("http.host")
// StatusCode is the numeric HTTP response status code,
// or "error" if a transport error occurred and no status code was read.
StatusCode, _ = tag.NewKey("http.status")
// Path is the URL path (not including query string) in the request.
//
// The value of this tag can be controlled by the HTTP client, so you need
// to watch out for potentially generating high-cardinality labels in your
// metrics backend if you use this tag in views.
Path, _ = tag.NewKey("http.path")
// Method is the HTTP method of the request, capitalized (GET, POST, etc.).
Method, _ = tag.NewKey("http.method")
// KeyServerRoute is a low cardinality string representing the logical
// handler of the request. This is usually the pattern registered on the a
// ServeMux (or similar string).
KeyServerRoute, _ = tag.NewKey("http_server_route")
)
// Client tag keys.
var (
// KeyClientMethod is the HTTP method, capitalized (i.e. GET, POST, PUT, DELETE, etc.).
KeyClientMethod, _ = tag.NewKey("http_client_method")
// KeyClientPath is the URL path (not including query string).
KeyClientPath, _ = tag.NewKey("http_client_path")
// KeyClientStatus is the HTTP status code as an integer (e.g. 200, 404, 500.), or "error" if no response status line was received.
KeyClientStatus, _ = tag.NewKey("http_client_status")
// KeyClientHost is the value of the request Host header.
KeyClientHost, _ = tag.NewKey("http_client_host")
)
// Default distributions used by views in this package.
var (
DefaultSizeDistribution = view.Distribution(1024, 2048, 4096, 16384, 65536, 262144, 1048576, 4194304, 16777216, 67108864, 268435456, 1073741824, 4294967296)
DefaultLatencyDistribution = view.Distribution(1, 2, 3, 4, 5, 6, 8, 10, 13, 16, 20, 25, 30, 40, 50, 65, 80, 100, 130, 160, 200, 250, 300, 400, 500, 650, 800, 1000, 2000, 5000, 10000, 20000, 50000, 100000)
)
// Package ochttp provides some convenience views for client measures.
// You still need to register these views for data to actually be collected.
var (
ClientSentBytesDistribution = &view.View{
Name: "opencensus.io/http/client/sent_bytes",
Measure: ClientSentBytes,
Aggregation: DefaultSizeDistribution,
Description: "Total bytes sent in request body (not including headers), by HTTP method and response status",
TagKeys: []tag.Key{KeyClientMethod, KeyClientStatus},
}
ClientReceivedBytesDistribution = &view.View{
Name: "opencensus.io/http/client/received_bytes",
Measure: ClientReceivedBytes,
Aggregation: DefaultSizeDistribution,
Description: "Total bytes received in response bodies (not including headers but including error responses with bodies), by HTTP method and response status",
TagKeys: []tag.Key{KeyClientMethod, KeyClientStatus},
}
ClientRoundtripLatencyDistribution = &view.View{
Name: "opencensus.io/http/client/roundtrip_latency",
Measure: ClientRoundtripLatency,
Aggregation: DefaultLatencyDistribution,
Description: "End-to-end latency, by HTTP method and response status",
TagKeys: []tag.Key{KeyClientMethod, KeyClientStatus},
}
ClientCompletedCount = &view.View{
Name: "opencensus.io/http/client/completed_count",
Measure: ClientRoundtripLatency,
Aggregation: view.Count(),
Description: "Count of completed requests, by HTTP method and response status",
TagKeys: []tag.Key{KeyClientMethod, KeyClientStatus},
}
)
// Deprecated: Old client Views.
var (
// Deprecated: No direct replacement, but see ClientCompletedCount.
ClientRequestCountView = &view.View{
Name: "opencensus.io/http/client/request_count",
Description: "Count of HTTP requests started",
Measure: ClientRequestCount,
Aggregation: view.Count(),
}
// Deprecated: Use ClientSentBytesDistribution.
ClientRequestBytesView = &view.View{
Name: "opencensus.io/http/client/request_bytes",
Description: "Size distribution of HTTP request body",
Measure: ClientSentBytes,
Aggregation: DefaultSizeDistribution,
}
// Deprecated: Use ClientReceivedBytesDistribution instead.
ClientResponseBytesView = &view.View{
Name: "opencensus.io/http/client/response_bytes",
Description: "Size distribution of HTTP response body",
Measure: ClientReceivedBytes,
Aggregation: DefaultSizeDistribution,
}
// Deprecated: Use ClientRoundtripLatencyDistribution instead.
ClientLatencyView = &view.View{
Name: "opencensus.io/http/client/latency",
Description: "Latency distribution of HTTP requests",
Measure: ClientRoundtripLatency,
Aggregation: DefaultLatencyDistribution,
}
// Deprecated: Use ClientCompletedCount instead.
ClientRequestCountByMethod = &view.View{
Name: "opencensus.io/http/client/request_count_by_method",
Description: "Client request count by HTTP method",
TagKeys: []tag.Key{Method},
Measure: ClientSentBytes,
Aggregation: view.Count(),
}
// Deprecated: Use ClientCompletedCount instead.
ClientResponseCountByStatusCode = &view.View{
Name: "opencensus.io/http/client/response_count_by_status_code",
Description: "Client response count by status code",
TagKeys: []tag.Key{StatusCode},
Measure: ClientRoundtripLatency,
Aggregation: view.Count(),
}
)
// Package ochttp provides some convenience views for server measures.
// You still need to register these views for data to actually be collected.
var (
ServerRequestCountView = &view.View{
Name: "opencensus.io/http/server/request_count",
Description: "Count of HTTP requests started",
Measure: ServerRequestCount,
Aggregation: view.Count(),
}
ServerRequestBytesView = &view.View{
Name: "opencensus.io/http/server/request_bytes",
Description: "Size distribution of HTTP request body",
Measure: ServerRequestBytes,
Aggregation: DefaultSizeDistribution,
}
ServerResponseBytesView = &view.View{
Name: "opencensus.io/http/server/response_bytes",
Description: "Size distribution of HTTP response body",
Measure: ServerResponseBytes,
Aggregation: DefaultSizeDistribution,
}
ServerLatencyView = &view.View{
Name: "opencensus.io/http/server/latency",
Description: "Latency distribution of HTTP requests",
Measure: ServerLatency,
Aggregation: DefaultLatencyDistribution,
}
ServerRequestCountByMethod = &view.View{
Name: "opencensus.io/http/server/request_count_by_method",
Description: "Server request count by HTTP method",
TagKeys: []tag.Key{Method},
Measure: ServerRequestCount,
Aggregation: view.Count(),
}
ServerResponseCountByStatusCode = &view.View{
Name: "opencensus.io/http/server/response_count_by_status_code",
Description: "Server response count by status code",
TagKeys: []tag.Key{StatusCode},
Measure: ServerLatency,
Aggregation: view.Count(),
}
)
// DefaultClientViews are the default client views provided by this package.
// Deprecated: No replacement. Register the views you would like individually.
var DefaultClientViews = []*view.View{
ClientRequestCountView,
ClientRequestBytesView,
ClientResponseBytesView,
ClientLatencyView,
ClientRequestCountByMethod,
ClientResponseCountByStatusCode,
}
// DefaultServerViews are the default server views provided by this package.
// Deprecated: No replacement. Register the views you would like individually.
var DefaultServerViews = []*view.View{
ServerRequestCountView,
ServerRequestBytesView,
ServerResponseBytesView,
ServerLatencyView,
ServerRequestCountByMethod,
ServerResponseCountByStatusCode,
}

239
vendor/go.opencensus.io/plugin/ochttp/trace.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ochttp
import (
"io"
"net/http"
"net/http/httptrace"
"go.opencensus.io/plugin/ochttp/propagation/b3"
"go.opencensus.io/trace"
"go.opencensus.io/trace/propagation"
)
// TODO(jbd): Add godoc examples.
var defaultFormat propagation.HTTPFormat = &b3.HTTPFormat{}
// Attributes recorded on the span for the requests.
// Only trace exporters will need them.
const (
HostAttribute = "http.host"
MethodAttribute = "http.method"
PathAttribute = "http.path"
URLAttribute = "http.url"
UserAgentAttribute = "http.user_agent"
StatusCodeAttribute = "http.status_code"
)
type traceTransport struct {
base http.RoundTripper
startOptions trace.StartOptions
format propagation.HTTPFormat
formatSpanName func(*http.Request) string
newClientTrace func(*http.Request, *trace.Span) *httptrace.ClientTrace
}
// TODO(jbd): Add message events for request and response size.
// RoundTrip creates a trace.Span and inserts it into the outgoing request's headers.
// The created span can follow a parent span, if a parent is presented in
// the request's context.
func (t *traceTransport) RoundTrip(req *http.Request) (*http.Response, error) {
name := t.formatSpanName(req)
// TODO(jbd): Discuss whether we want to prefix
// outgoing requests with Sent.
ctx, span := trace.StartSpan(req.Context(), name,
trace.WithSampler(t.startOptions.Sampler),
trace.WithSpanKind(trace.SpanKindClient))
if t.newClientTrace != nil {
req = req.WithContext(httptrace.WithClientTrace(ctx, t.newClientTrace(req, span)))
} else {
req = req.WithContext(ctx)
}
if t.format != nil {
// SpanContextToRequest will modify its Request argument, which is
// contrary to the contract for http.RoundTripper, so we need to
// pass it a copy of the Request.
// However, the Request struct itself was already copied by
// the WithContext calls above and so we just need to copy the header.
header := make(http.Header)
for k, v := range req.Header {
header[k] = v
}
req.Header = header
t.format.SpanContextToRequest(span.SpanContext(), req)
}
span.AddAttributes(requestAttrs(req)...)
resp, err := t.base.RoundTrip(req)
if err != nil {
span.SetStatus(trace.Status{Code: trace.StatusCodeUnknown, Message: err.Error()})
span.End()
return resp, err
}
span.AddAttributes(responseAttrs(resp)...)
span.SetStatus(TraceStatus(resp.StatusCode, resp.Status))
// span.End() will be invoked after
// a read from resp.Body returns io.EOF or when
// resp.Body.Close() is invoked.
bt := &bodyTracker{rc: resp.Body, span: span}
resp.Body = wrappedBody(bt, resp.Body)
return resp, err
}
// bodyTracker wraps a response.Body and invokes
// trace.EndSpan on encountering io.EOF on reading
// the body of the original response.
type bodyTracker struct {
rc io.ReadCloser
span *trace.Span
}
var _ io.ReadCloser = (*bodyTracker)(nil)
func (bt *bodyTracker) Read(b []byte) (int, error) {
n, err := bt.rc.Read(b)
switch err {
case nil:
return n, nil
case io.EOF:
bt.span.End()
default:
// For all other errors, set the span status
bt.span.SetStatus(trace.Status{
// Code 2 is the error code for Internal server error.
Code: 2,
Message: err.Error(),
})
}
return n, err
}
func (bt *bodyTracker) Close() error {
// Invoking endSpan on Close will help catch the cases
// in which a read returned a non-nil error, we set the
// span status but didn't end the span.
bt.span.End()
return bt.rc.Close()
}
// CancelRequest cancels an in-flight request by closing its connection.
func (t *traceTransport) CancelRequest(req *http.Request) {
type canceler interface {
CancelRequest(*http.Request)
}
if cr, ok := t.base.(canceler); ok {
cr.CancelRequest(req)
}
}
func spanNameFromURL(req *http.Request) string {
return req.URL.Path
}
func requestAttrs(r *http.Request) []trace.Attribute {
userAgent := r.UserAgent()
attrs := make([]trace.Attribute, 0, 5)
attrs = append(attrs,
trace.StringAttribute(PathAttribute, r.URL.Path),
trace.StringAttribute(URLAttribute, r.URL.String()),
trace.StringAttribute(HostAttribute, r.Host),
trace.StringAttribute(MethodAttribute, r.Method),
)
if userAgent != "" {
attrs = append(attrs, trace.StringAttribute(UserAgentAttribute, userAgent))
}
return attrs
}
func responseAttrs(resp *http.Response) []trace.Attribute {
return []trace.Attribute{
trace.Int64Attribute(StatusCodeAttribute, int64(resp.StatusCode)),
}
}
// TraceStatus is a utility to convert the HTTP status code to a trace.Status that
// represents the outcome as closely as possible.
func TraceStatus(httpStatusCode int, statusLine string) trace.Status {
var code int32
if httpStatusCode < 200 || httpStatusCode >= 400 {
code = trace.StatusCodeUnknown
}
switch httpStatusCode {
case 499:
code = trace.StatusCodeCancelled
case http.StatusBadRequest:
code = trace.StatusCodeInvalidArgument
case http.StatusGatewayTimeout:
code = trace.StatusCodeDeadlineExceeded
case http.StatusNotFound:
code = trace.StatusCodeNotFound
case http.StatusForbidden:
code = trace.StatusCodePermissionDenied
case http.StatusUnauthorized: // 401 is actually unauthenticated.
code = trace.StatusCodeUnauthenticated
case http.StatusTooManyRequests:
code = trace.StatusCodeResourceExhausted
case http.StatusNotImplemented:
code = trace.StatusCodeUnimplemented
case http.StatusServiceUnavailable:
code = trace.StatusCodeUnavailable
case http.StatusOK:
code = trace.StatusCodeOK
}
return trace.Status{Code: code, Message: codeToStr[code]}
}
var codeToStr = map[int32]string{
trace.StatusCodeOK: `OK`,
trace.StatusCodeCancelled: `CANCELLED`,
trace.StatusCodeUnknown: `UNKNOWN`,
trace.StatusCodeInvalidArgument: `INVALID_ARGUMENT`,
trace.StatusCodeDeadlineExceeded: `DEADLINE_EXCEEDED`,
trace.StatusCodeNotFound: `NOT_FOUND`,
trace.StatusCodeAlreadyExists: `ALREADY_EXISTS`,
trace.StatusCodePermissionDenied: `PERMISSION_DENIED`,
trace.StatusCodeResourceExhausted: `RESOURCE_EXHAUSTED`,
trace.StatusCodeFailedPrecondition: `FAILED_PRECONDITION`,
trace.StatusCodeAborted: `ABORTED`,
trace.StatusCodeOutOfRange: `OUT_OF_RANGE`,
trace.StatusCodeUnimplemented: `UNIMPLEMENTED`,
trace.StatusCodeInternal: `INTERNAL`,
trace.StatusCodeUnavailable: `UNAVAILABLE`,
trace.StatusCodeDataLoss: `DATA_LOSS`,
trace.StatusCodeUnauthenticated: `UNAUTHENTICATED`,
}
func isHealthEndpoint(path string) bool {
// Health checking is pretty frequent and
// traces collected for health endpoints
// can be extremely noisy and expensive.
// Disable canonical health checking endpoints
// like /healthz and /_ah/health for now.
if path == "/healthz" || path == "/_ah/health" {
return true
}
return false
}

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// Copyright 2019, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ochttp
import (
"io"
)
// wrappedBody returns a wrapped version of the original
// Body and only implements the same combination of additional
// interfaces as the original.
func wrappedBody(wrapper io.ReadCloser, body io.ReadCloser) io.ReadCloser {
var (
wr, i0 = body.(io.Writer)
)
switch {
case !i0:
return struct {
io.ReadCloser
}{wrapper}
case i0:
return struct {
io.ReadCloser
io.Writer
}{wrapper, wr}
default:
return struct {
io.ReadCloser
}{wrapper}
}
}

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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package resource provides functionality for resource, which capture
// identifying information about the entities for which signals are exported.
package resource
import (
"context"
"fmt"
"os"
"regexp"
"sort"
"strconv"
"strings"
)
// Environment variables used by FromEnv to decode a resource.
const (
EnvVarType = "OC_RESOURCE_TYPE"
EnvVarLabels = "OC_RESOURCE_LABELS"
)
// Resource describes an entity about which identifying information and metadata is exposed.
// For example, a type "k8s.io/container" may hold labels describing the pod name and namespace.
type Resource struct {
Type string
Labels map[string]string
}
// EncodeLabels encodes a labels map to a string as provided via the OC_RESOURCE_LABELS environment variable.
func EncodeLabels(labels map[string]string) string {
sortedKeys := make([]string, 0, len(labels))
for k := range labels {
sortedKeys = append(sortedKeys, k)
}
sort.Strings(sortedKeys)
s := ""
for i, k := range sortedKeys {
if i > 0 {
s += ","
}
s += k + "=" + strconv.Quote(labels[k])
}
return s
}
var labelRegex = regexp.MustCompile(`^\s*([[:ascii:]]{1,256}?)=("[[:ascii:]]{0,256}?")\s*,`)
// DecodeLabels decodes a serialized label map as used in the OC_RESOURCE_LABELS variable.
// A list of labels of the form `<key1>="<value1>",<key2>="<value2>",...` is accepted.
// Domain names and paths are accepted as label keys.
// Most users will want to use FromEnv instead.
func DecodeLabels(s string) (map[string]string, error) {
m := map[string]string{}
// Ensure a trailing comma, which allows us to keep the regex simpler
s = strings.TrimRight(strings.TrimSpace(s), ",") + ","
for len(s) > 0 {
match := labelRegex.FindStringSubmatch(s)
if len(match) == 0 {
return nil, fmt.Errorf("invalid label formatting, remainder: %s", s)
}
v := match[2]
if v == "" {
v = match[3]
} else {
var err error
if v, err = strconv.Unquote(v); err != nil {
return nil, fmt.Errorf("invalid label formatting, remainder: %s, err: %s", s, err)
}
}
m[match[1]] = v
s = s[len(match[0]):]
}
return m, nil
}
// FromEnv is a detector that loads resource information from the OC_RESOURCE_TYPE
// and OC_RESOURCE_labelS environment variables.
func FromEnv(context.Context) (*Resource, error) {
res := &Resource{
Type: strings.TrimSpace(os.Getenv(EnvVarType)),
}
labels := strings.TrimSpace(os.Getenv(EnvVarLabels))
if labels == "" {
return res, nil
}
var err error
if res.Labels, err = DecodeLabels(labels); err != nil {
return nil, err
}
return res, nil
}
var _ Detector = FromEnv
// merge resource information from b into a. In case of a collision, a takes precedence.
func merge(a, b *Resource) *Resource {
if a == nil {
return b
}
if b == nil {
return a
}
res := &Resource{
Type: a.Type,
Labels: map[string]string{},
}
if res.Type == "" {
res.Type = b.Type
}
for k, v := range b.Labels {
res.Labels[k] = v
}
// Labels from resource a overwrite labels from resource b.
for k, v := range a.Labels {
res.Labels[k] = v
}
return res
}
// Detector attempts to detect resource information.
// If the detector cannot find resource information, the returned resource is nil but no
// error is returned.
// An error is only returned on unexpected failures.
type Detector func(context.Context) (*Resource, error)
// MultiDetector returns a Detector that calls all input detectors in order and
// merges each result with the previous one. In case a type of label key is already set,
// the first set value is takes precedence.
// It returns on the first error that a sub-detector encounters.
func MultiDetector(detectors ...Detector) Detector {
return func(ctx context.Context) (*Resource, error) {
return detectAll(ctx, detectors...)
}
}
// detectall calls all input detectors sequentially an merges each result with the previous one.
// It returns on the first error that a sub-detector encounters.
func detectAll(ctx context.Context, detectors ...Detector) (*Resource, error) {
var res *Resource
for _, d := range detectors {
r, err := d(ctx)
if err != nil {
return nil, err
}
res = merge(res, r)
}
return res, nil
}

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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
/*
Package stats contains support for OpenCensus stats recording.
OpenCensus allows users to create typed measures, record measurements,
aggregate the collected data, and export the aggregated data.
Measures
A measure represents a type of data point to be tracked and recorded.
For example, latency, request Mb/s, and response Mb/s are measures
to collect from a server.
Measure constructors such as Int64 and Float64 automatically
register the measure by the given name. Each registered measure needs
to be unique by name. Measures also have a description and a unit.
Libraries can define and export measures. Application authors can then
create views and collect and break down measures by the tags they are
interested in.
Recording measurements
Measurement is a data point to be collected for a measure. For example,
for a latency (ms) measure, 100 is a measurement that represents a 100ms
latency event. Measurements are created from measures with
the current context. Tags from the current context are recorded with the
measurements if they are any.
Recorded measurements are dropped immediately if no views are registered for them.
There is usually no need to conditionally enable and disable
recording to reduce cost. Recording of measurements is cheap.
Libraries can always record measurements, and applications can later decide
on which measurements they want to collect by registering views. This allows
libraries to turn on the instrumentation by default.
Exemplars
For a given recorded measurement, the associated exemplar is a diagnostic map
that gives more information about the measurement.
When aggregated using a Distribution aggregation, an exemplar is kept for each
bucket in the Distribution. This allows you to easily find an example of a
measurement that fell into each bucket.
For example, if you also use the OpenCensus trace package and you
record a measurement with a context that contains a sampled trace span,
then the trace span will be added to the exemplar associated with the measurement.
When exported to a supporting back end, you should be able to easily navigate
to example traces that fell into each bucket in the Distribution.
*/
package stats // import "go.opencensus.io/stats"

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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package internal
import (
"go.opencensus.io/tag"
)
// DefaultRecorder will be called for each Record call.
var DefaultRecorder func(tags *tag.Map, measurement interface{}, attachments map[string]interface{})
// SubscriptionReporter reports when a view subscribed with a measure.
var SubscriptionReporter func(measure string)

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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package stats
import (
"sync"
"sync/atomic"
)
// Measure represents a single numeric value to be tracked and recorded.
// For example, latency, request bytes, and response bytes could be measures
// to collect from a server.
//
// Measures by themselves have no outside effects. In order to be exported,
// the measure needs to be used in a View. If no Views are defined over a
// measure, there is very little cost in recording it.
type Measure interface {
// Name returns the name of this measure.
//
// Measure names are globally unique (among all libraries linked into your program).
// We recommend prefixing the measure name with a domain name relevant to your
// project or application.
//
// Measure names are never sent over the wire or exported to backends.
// They are only used to create Views.
Name() string
// Description returns the human-readable description of this measure.
Description() string
// Unit returns the units for the values this measure takes on.
//
// Units are encoded according to the case-sensitive abbreviations from the
// Unified Code for Units of Measure: http://unitsofmeasure.org/ucum.html
Unit() string
}
// measureDescriptor is the untyped descriptor associated with each measure.
// Int64Measure and Float64Measure wrap measureDescriptor to provide typed
// recording APIs.
// Two Measures with the same name will have the same measureDescriptor.
type measureDescriptor struct {
subs int32 // access atomically
name string
description string
unit string
}
func (m *measureDescriptor) subscribe() {
atomic.StoreInt32(&m.subs, 1)
}
func (m *measureDescriptor) subscribed() bool {
return atomic.LoadInt32(&m.subs) == 1
}
var (
mu sync.RWMutex
measures = make(map[string]*measureDescriptor)
)
func registerMeasureHandle(name, desc, unit string) *measureDescriptor {
mu.Lock()
defer mu.Unlock()
if stored, ok := measures[name]; ok {
return stored
}
m := &measureDescriptor{
name: name,
description: desc,
unit: unit,
}
measures[name] = m
return m
}
// Measurement is the numeric value measured when recording stats. Each measure
// provides methods to create measurements of their kind. For example, Int64Measure
// provides M to convert an int64 into a measurement.
type Measurement struct {
v float64
m Measure
desc *measureDescriptor
}
// Value returns the value of the Measurement as a float64.
func (m Measurement) Value() float64 {
return m.v
}
// Measure returns the Measure from which this Measurement was created.
func (m Measurement) Measure() Measure {
return m.m
}

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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package stats
// Float64Measure is a measure for float64 values.
type Float64Measure struct {
desc *measureDescriptor
}
// M creates a new float64 measurement.
// Use Record to record measurements.
func (m *Float64Measure) M(v float64) Measurement {
return Measurement{
m: m,
desc: m.desc,
v: v,
}
}
// Float64 creates a new measure for float64 values.
//
// See the documentation for interface Measure for more guidance on the
// parameters of this function.
func Float64(name, description, unit string) *Float64Measure {
mi := registerMeasureHandle(name, description, unit)
return &Float64Measure{mi}
}
// Name returns the name of the measure.
func (m *Float64Measure) Name() string {
return m.desc.name
}
// Description returns the description of the measure.
func (m *Float64Measure) Description() string {
return m.desc.description
}
// Unit returns the unit of the measure.
func (m *Float64Measure) Unit() string {
return m.desc.unit
}

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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package stats
// Int64Measure is a measure for int64 values.
type Int64Measure struct {
desc *measureDescriptor
}
// M creates a new int64 measurement.
// Use Record to record measurements.
func (m *Int64Measure) M(v int64) Measurement {
return Measurement{
m: m,
desc: m.desc,
v: float64(v),
}
}
// Int64 creates a new measure for int64 values.
//
// See the documentation for interface Measure for more guidance on the
// parameters of this function.
func Int64(name, description, unit string) *Int64Measure {
mi := registerMeasureHandle(name, description, unit)
return &Int64Measure{mi}
}
// Name returns the name of the measure.
func (m *Int64Measure) Name() string {
return m.desc.name
}
// Description returns the description of the measure.
func (m *Int64Measure) Description() string {
return m.desc.description
}
// Unit returns the unit of the measure.
func (m *Int64Measure) Unit() string {
return m.desc.unit
}

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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package stats
import (
"context"
"go.opencensus.io/metric/metricdata"
"go.opencensus.io/stats/internal"
"go.opencensus.io/tag"
)
func init() {
internal.SubscriptionReporter = func(measure string) {
mu.Lock()
measures[measure].subscribe()
mu.Unlock()
}
}
type recordOptions struct {
attachments metricdata.Attachments
mutators []tag.Mutator
measurements []Measurement
}
// WithAttachments applies provided exemplar attachments.
func WithAttachments(attachments metricdata.Attachments) Options {
return func(ro *recordOptions) {
ro.attachments = attachments
}
}
// WithTags applies provided tag mutators.
func WithTags(mutators ...tag.Mutator) Options {
return func(ro *recordOptions) {
ro.mutators = mutators
}
}
// WithMeasurements applies provided measurements.
func WithMeasurements(measurements ...Measurement) Options {
return func(ro *recordOptions) {
ro.measurements = measurements
}
}
// Options apply changes to recordOptions.
type Options func(*recordOptions)
func createRecordOption(ros ...Options) *recordOptions {
o := &recordOptions{}
for _, ro := range ros {
ro(o)
}
return o
}
// Record records one or multiple measurements with the same context at once.
// If there are any tags in the context, measurements will be tagged with them.
func Record(ctx context.Context, ms ...Measurement) {
RecordWithOptions(ctx, WithMeasurements(ms...))
}
// RecordWithTags records one or multiple measurements at once.
//
// Measurements will be tagged with the tags in the context mutated by the mutators.
// RecordWithTags is useful if you want to record with tag mutations but don't want
// to propagate the mutations in the context.
func RecordWithTags(ctx context.Context, mutators []tag.Mutator, ms ...Measurement) error {
return RecordWithOptions(ctx, WithTags(mutators...), WithMeasurements(ms...))
}
// RecordWithOptions records measurements from the given options (if any) against context
// and tags and attachments in the options (if any).
// If there are any tags in the context, measurements will be tagged with them.
func RecordWithOptions(ctx context.Context, ros ...Options) error {
o := createRecordOption(ros...)
if len(o.measurements) == 0 {
return nil
}
recorder := internal.DefaultRecorder
if recorder == nil {
return nil
}
record := false
for _, m := range o.measurements {
if m.desc.subscribed() {
record = true
break
}
}
if !record {
return nil
}
if len(o.mutators) > 0 {
var err error
if ctx, err = tag.New(ctx, o.mutators...); err != nil {
return err
}
}
recorder(tag.FromContext(ctx), o.measurements, o.attachments)
return nil
}

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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package stats
// Units are encoded according to the case-sensitive abbreviations from the
// Unified Code for Units of Measure: http://unitsofmeasure.org/ucum.html
const (
UnitNone = "1" // Deprecated: Use UnitDimensionless.
UnitDimensionless = "1"
UnitBytes = "By"
UnitMilliseconds = "ms"
)

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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package view
// AggType represents the type of aggregation function used on a View.
type AggType int
// All available aggregation types.
const (
AggTypeNone AggType = iota // no aggregation; reserved for future use.
AggTypeCount // the count aggregation, see Count.
AggTypeSum // the sum aggregation, see Sum.
AggTypeDistribution // the distribution aggregation, see Distribution.
AggTypeLastValue // the last value aggregation, see LastValue.
)
func (t AggType) String() string {
return aggTypeName[t]
}
var aggTypeName = map[AggType]string{
AggTypeNone: "None",
AggTypeCount: "Count",
AggTypeSum: "Sum",
AggTypeDistribution: "Distribution",
AggTypeLastValue: "LastValue",
}
// Aggregation represents a data aggregation method. Use one of the functions:
// Count, Sum, or Distribution to construct an Aggregation.
type Aggregation struct {
Type AggType // Type is the AggType of this Aggregation.
Buckets []float64 // Buckets are the bucket endpoints if this Aggregation represents a distribution, see Distribution.
newData func() AggregationData
}
var (
aggCount = &Aggregation{
Type: AggTypeCount,
newData: func() AggregationData {
return &CountData{}
},
}
aggSum = &Aggregation{
Type: AggTypeSum,
newData: func() AggregationData {
return &SumData{}
},
}
)
// Count indicates that data collected and aggregated
// with this method will be turned into a count value.
// For example, total number of accepted requests can be
// aggregated by using Count.
func Count() *Aggregation {
return aggCount
}
// Sum indicates that data collected and aggregated
// with this method will be summed up.
// For example, accumulated request bytes can be aggregated by using
// Sum.
func Sum() *Aggregation {
return aggSum
}
// Distribution indicates that the desired aggregation is
// a histogram distribution.
//
// An distribution aggregation may contain a histogram of the values in the
// population. The bucket boundaries for that histogram are described
// by the bounds. This defines len(bounds)+1 buckets.
//
// If len(bounds) >= 2 then the boundaries for bucket index i are:
//
// [-infinity, bounds[i]) for i = 0
// [bounds[i-1], bounds[i]) for 0 < i < length
// [bounds[i-1], +infinity) for i = length
//
// If len(bounds) is 0 then there is no histogram associated with the
// distribution. There will be a single bucket with boundaries
// (-infinity, +infinity).
//
// If len(bounds) is 1 then there is no finite buckets, and that single
// element is the common boundary of the overflow and underflow buckets.
func Distribution(bounds ...float64) *Aggregation {
return &Aggregation{
Type: AggTypeDistribution,
Buckets: bounds,
newData: func() AggregationData {
return newDistributionData(bounds)
},
}
}
// LastValue only reports the last value recorded using this
// aggregation. All other measurements will be dropped.
func LastValue() *Aggregation {
return &Aggregation{
Type: AggTypeLastValue,
newData: func() AggregationData {
return &LastValueData{}
},
}
}

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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package view
import (
"math"
"time"
"go.opencensus.io/metric/metricdata"
)
// AggregationData represents an aggregated value from a collection.
// They are reported on the view data during exporting.
// Mosts users won't directly access aggregration data.
type AggregationData interface {
isAggregationData() bool
addSample(v float64, attachments map[string]interface{}, t time.Time)
clone() AggregationData
equal(other AggregationData) bool
toPoint(t metricdata.Type, time time.Time) metricdata.Point
}
const epsilon = 1e-9
// CountData is the aggregated data for the Count aggregation.
// A count aggregation processes data and counts the recordings.
//
// Most users won't directly access count data.
type CountData struct {
Value int64
}
func (a *CountData) isAggregationData() bool { return true }
func (a *CountData) addSample(_ float64, _ map[string]interface{}, _ time.Time) {
a.Value = a.Value + 1
}
func (a *CountData) clone() AggregationData {
return &CountData{Value: a.Value}
}
func (a *CountData) equal(other AggregationData) bool {
a2, ok := other.(*CountData)
if !ok {
return false
}
return a.Value == a2.Value
}
func (a *CountData) toPoint(metricType metricdata.Type, t time.Time) metricdata.Point {
switch metricType {
case metricdata.TypeCumulativeInt64:
return metricdata.NewInt64Point(t, a.Value)
default:
panic("unsupported metricdata.Type")
}
}
// SumData is the aggregated data for the Sum aggregation.
// A sum aggregation processes data and sums up the recordings.
//
// Most users won't directly access sum data.
type SumData struct {
Value float64
}
func (a *SumData) isAggregationData() bool { return true }
func (a *SumData) addSample(v float64, _ map[string]interface{}, _ time.Time) {
a.Value += v
}
func (a *SumData) clone() AggregationData {
return &SumData{Value: a.Value}
}
func (a *SumData) equal(other AggregationData) bool {
a2, ok := other.(*SumData)
if !ok {
return false
}
return math.Pow(a.Value-a2.Value, 2) < epsilon
}
func (a *SumData) toPoint(metricType metricdata.Type, t time.Time) metricdata.Point {
switch metricType {
case metricdata.TypeCumulativeInt64:
return metricdata.NewInt64Point(t, int64(a.Value))
case metricdata.TypeCumulativeFloat64:
return metricdata.NewFloat64Point(t, a.Value)
default:
panic("unsupported metricdata.Type")
}
}
// DistributionData is the aggregated data for the
// Distribution aggregation.
//
// Most users won't directly access distribution data.
//
// For a distribution with N bounds, the associated DistributionData will have
// N+1 buckets.
type DistributionData struct {
Count int64 // number of data points aggregated
Min float64 // minimum value in the distribution
Max float64 // max value in the distribution
Mean float64 // mean of the distribution
SumOfSquaredDev float64 // sum of the squared deviation from the mean
CountPerBucket []int64 // number of occurrences per bucket
// ExemplarsPerBucket is slice the same length as CountPerBucket containing
// an exemplar for the associated bucket, or nil.
ExemplarsPerBucket []*metricdata.Exemplar
bounds []float64 // histogram distribution of the values
}
func newDistributionData(bounds []float64) *DistributionData {
bucketCount := len(bounds) + 1
return &DistributionData{
CountPerBucket: make([]int64, bucketCount),
ExemplarsPerBucket: make([]*metricdata.Exemplar, bucketCount),
bounds: bounds,
Min: math.MaxFloat64,
Max: math.SmallestNonzeroFloat64,
}
}
// Sum returns the sum of all samples collected.
func (a *DistributionData) Sum() float64 { return a.Mean * float64(a.Count) }
func (a *DistributionData) variance() float64 {
if a.Count <= 1 {
return 0
}
return a.SumOfSquaredDev / float64(a.Count-1)
}
func (a *DistributionData) isAggregationData() bool { return true }
// TODO(songy23): support exemplar attachments.
func (a *DistributionData) addSample(v float64, attachments map[string]interface{}, t time.Time) {
if v < a.Min {
a.Min = v
}
if v > a.Max {
a.Max = v
}
a.Count++
a.addToBucket(v, attachments, t)
if a.Count == 1 {
a.Mean = v
return
}
oldMean := a.Mean
a.Mean = a.Mean + (v-a.Mean)/float64(a.Count)
a.SumOfSquaredDev = a.SumOfSquaredDev + (v-oldMean)*(v-a.Mean)
}
func (a *DistributionData) addToBucket(v float64, attachments map[string]interface{}, t time.Time) {
var count *int64
var i int
var b float64
for i, b = range a.bounds {
if v < b {
count = &a.CountPerBucket[i]
break
}
}
if count == nil { // Last bucket.
i = len(a.bounds)
count = &a.CountPerBucket[i]
}
*count++
if exemplar := getExemplar(v, attachments, t); exemplar != nil {
a.ExemplarsPerBucket[i] = exemplar
}
}
func getExemplar(v float64, attachments map[string]interface{}, t time.Time) *metricdata.Exemplar {
if len(attachments) == 0 {
return nil
}
return &metricdata.Exemplar{
Value: v,
Timestamp: t,
Attachments: attachments,
}
}
func (a *DistributionData) clone() AggregationData {
c := *a
c.CountPerBucket = append([]int64(nil), a.CountPerBucket...)
c.ExemplarsPerBucket = append([]*metricdata.Exemplar(nil), a.ExemplarsPerBucket...)
return &c
}
func (a *DistributionData) equal(other AggregationData) bool {
a2, ok := other.(*DistributionData)
if !ok {
return false
}
if a2 == nil {
return false
}
if len(a.CountPerBucket) != len(a2.CountPerBucket) {
return false
}
for i := range a.CountPerBucket {
if a.CountPerBucket[i] != a2.CountPerBucket[i] {
return false
}
}
return a.Count == a2.Count && a.Min == a2.Min && a.Max == a2.Max && math.Pow(a.Mean-a2.Mean, 2) < epsilon && math.Pow(a.variance()-a2.variance(), 2) < epsilon
}
func (a *DistributionData) toPoint(metricType metricdata.Type, t time.Time) metricdata.Point {
switch metricType {
case metricdata.TypeCumulativeDistribution:
buckets := []metricdata.Bucket{}
for i := 0; i < len(a.CountPerBucket); i++ {
buckets = append(buckets, metricdata.Bucket{
Count: a.CountPerBucket[i],
Exemplar: a.ExemplarsPerBucket[i],
})
}
bucketOptions := &metricdata.BucketOptions{Bounds: a.bounds}
val := &metricdata.Distribution{
Count: a.Count,
Sum: a.Sum(),
SumOfSquaredDeviation: a.SumOfSquaredDev,
BucketOptions: bucketOptions,
Buckets: buckets,
}
return metricdata.NewDistributionPoint(t, val)
default:
// TODO: [rghetia] when we have a use case for TypeGaugeDistribution.
panic("unsupported metricdata.Type")
}
}
// LastValueData returns the last value recorded for LastValue aggregation.
type LastValueData struct {
Value float64
}
func (l *LastValueData) isAggregationData() bool {
return true
}
func (l *LastValueData) addSample(v float64, _ map[string]interface{}, _ time.Time) {
l.Value = v
}
func (l *LastValueData) clone() AggregationData {
return &LastValueData{l.Value}
}
func (l *LastValueData) equal(other AggregationData) bool {
a2, ok := other.(*LastValueData)
if !ok {
return false
}
return l.Value == a2.Value
}
func (l *LastValueData) toPoint(metricType metricdata.Type, t time.Time) metricdata.Point {
switch metricType {
case metricdata.TypeGaugeInt64:
return metricdata.NewInt64Point(t, int64(l.Value))
case metricdata.TypeGaugeFloat64:
return metricdata.NewFloat64Point(t, l.Value)
default:
panic("unsupported metricdata.Type")
}
}

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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package view
import (
"sort"
"time"
"go.opencensus.io/internal/tagencoding"
"go.opencensus.io/tag"
)
type collector struct {
// signatures holds the aggregations values for each unique tag signature
// (values for all keys) to its aggregator.
signatures map[string]AggregationData
// Aggregation is the description of the aggregation to perform for this
// view.
a *Aggregation
}
func (c *collector) addSample(s string, v float64, attachments map[string]interface{}, t time.Time) {
aggregator, ok := c.signatures[s]
if !ok {
aggregator = c.a.newData()
c.signatures[s] = aggregator
}
aggregator.addSample(v, attachments, t)
}
// collectRows returns a snapshot of the collected Row values.
func (c *collector) collectedRows(keys []tag.Key) []*Row {
rows := make([]*Row, 0, len(c.signatures))
for sig, aggregator := range c.signatures {
tags := decodeTags([]byte(sig), keys)
row := &Row{Tags: tags, Data: aggregator.clone()}
rows = append(rows, row)
}
return rows
}
func (c *collector) clearRows() {
c.signatures = make(map[string]AggregationData)
}
// encodeWithKeys encodes the map by using values
// only associated with the keys provided.
func encodeWithKeys(m *tag.Map, keys []tag.Key) []byte {
vb := &tagencoding.Values{
Buffer: make([]byte, len(keys)),
}
for _, k := range keys {
v, _ := m.Value(k)
vb.WriteValue([]byte(v))
}
return vb.Bytes()
}
// decodeTags decodes tags from the buffer and
// orders them by the keys.
func decodeTags(buf []byte, keys []tag.Key) []tag.Tag {
vb := &tagencoding.Values{Buffer: buf}
var tags []tag.Tag
for _, k := range keys {
v := vb.ReadValue()
if v != nil {
tags = append(tags, tag.Tag{Key: k, Value: string(v)})
}
}
vb.ReadIndex = 0
sort.Slice(tags, func(i, j int) bool { return tags[i].Key.Name() < tags[j].Key.Name() })
return tags
}

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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Package view contains support for collecting and exposing aggregates over stats.
//
// In order to collect measurements, views need to be defined and registered.
// A view allows recorded measurements to be filtered and aggregated.
//
// All recorded measurements can be grouped by a list of tags.
//
// OpenCensus provides several aggregation methods: Count, Distribution and Sum.
//
// Count only counts the number of measurement points recorded.
// Distribution provides statistical summary of the aggregated data by counting
// how many recorded measurements fall into each bucket.
// Sum adds up the measurement values.
// LastValue just keeps track of the most recently recorded measurement value.
// All aggregations are cumulative.
//
// Views can be registerd and unregistered at any time during program execution.
//
// Libraries can define views but it is recommended that in most cases registering
// views be left up to applications.
//
// Exporting
//
// Collected and aggregated data can be exported to a metric collection
// backend by registering its exporter.
//
// Multiple exporters can be registered to upload the data to various
// different back ends.
package view // import "go.opencensus.io/stats/view"
// TODO(acetechnologist): Add a link to the language independent OpenCensus
// spec when it is available.

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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package view
import "sync"
var (
exportersMu sync.RWMutex // guards exporters
exporters = make(map[Exporter]struct{})
)
// Exporter exports the collected records as view data.
//
// The ExportView method should return quickly; if an
// Exporter takes a significant amount of time to
// process a Data, that work should be done on another goroutine.
//
// It is safe to assume that ExportView will not be called concurrently from
// multiple goroutines.
//
// The Data should not be modified.
type Exporter interface {
ExportView(viewData *Data)
}
// RegisterExporter registers an exporter.
// Collected data will be reported via all the
// registered exporters. Once you no longer
// want data to be exported, invoke UnregisterExporter
// with the previously registered exporter.
//
// Binaries can register exporters, libraries shouldn't register exporters.
func RegisterExporter(e Exporter) {
exportersMu.Lock()
defer exportersMu.Unlock()
exporters[e] = struct{}{}
}
// UnregisterExporter unregisters an exporter.
func UnregisterExporter(e Exporter) {
exportersMu.Lock()
defer exportersMu.Unlock()
delete(exporters, e)
}

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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package view
import (
"bytes"
"errors"
"fmt"
"reflect"
"sort"
"sync/atomic"
"time"
"go.opencensus.io/metric/metricdata"
"go.opencensus.io/stats"
"go.opencensus.io/tag"
)
// View allows users to aggregate the recorded stats.Measurements.
// Views need to be passed to the Register function to be before data will be
// collected and sent to Exporters.
type View struct {
Name string // Name of View. Must be unique. If unset, will default to the name of the Measure.
Description string // Description is a human-readable description for this view.
// TagKeys are the tag keys describing the grouping of this view.
// A single Row will be produced for each combination of associated tag values.
TagKeys []tag.Key
// Measure is a stats.Measure to aggregate in this view.
Measure stats.Measure
// Aggregation is the aggregation function tp apply to the set of Measurements.
Aggregation *Aggregation
}
// WithName returns a copy of the View with a new name. This is useful for
// renaming views to cope with limitations placed on metric names by various
// backends.
func (v *View) WithName(name string) *View {
vNew := *v
vNew.Name = name
return &vNew
}
// same compares two views and returns true if they represent the same aggregation.
func (v *View) same(other *View) bool {
if v == other {
return true
}
if v == nil {
return false
}
return reflect.DeepEqual(v.Aggregation, other.Aggregation) &&
v.Measure.Name() == other.Measure.Name()
}
// ErrNegativeBucketBounds error returned if histogram contains negative bounds.
//
// Deprecated: this should not be public.
var ErrNegativeBucketBounds = errors.New("negative bucket bounds not supported")
// canonicalize canonicalizes v by setting explicit
// defaults for Name and Description and sorting the TagKeys
func (v *View) canonicalize() error {
if v.Measure == nil {
return fmt.Errorf("cannot register view %q: measure not set", v.Name)
}
if v.Aggregation == nil {
return fmt.Errorf("cannot register view %q: aggregation not set", v.Name)
}
if v.Name == "" {
v.Name = v.Measure.Name()
}
if v.Description == "" {
v.Description = v.Measure.Description()
}
if err := checkViewName(v.Name); err != nil {
return err
}
sort.Slice(v.TagKeys, func(i, j int) bool {
return v.TagKeys[i].Name() < v.TagKeys[j].Name()
})
sort.Float64s(v.Aggregation.Buckets)
for _, b := range v.Aggregation.Buckets {
if b < 0 {
return ErrNegativeBucketBounds
}
}
// drop 0 bucket silently.
v.Aggregation.Buckets = dropZeroBounds(v.Aggregation.Buckets...)
return nil
}
func dropZeroBounds(bounds ...float64) []float64 {
for i, bound := range bounds {
if bound > 0 {
return bounds[i:]
}
}
return []float64{}
}
// viewInternal is the internal representation of a View.
type viewInternal struct {
view *View // view is the canonicalized View definition associated with this view.
subscribed uint32 // 1 if someone is subscribed and data need to be exported, use atomic to access
collector *collector
metricDescriptor *metricdata.Descriptor
}
func newViewInternal(v *View) (*viewInternal, error) {
return &viewInternal{
view: v,
collector: &collector{make(map[string]AggregationData), v.Aggregation},
metricDescriptor: viewToMetricDescriptor(v),
}, nil
}
func (v *viewInternal) subscribe() {
atomic.StoreUint32(&v.subscribed, 1)
}
func (v *viewInternal) unsubscribe() {
atomic.StoreUint32(&v.subscribed, 0)
}
// isSubscribed returns true if the view is exporting
// data by subscription.
func (v *viewInternal) isSubscribed() bool {
return atomic.LoadUint32(&v.subscribed) == 1
}
func (v *viewInternal) clearRows() {
v.collector.clearRows()
}
func (v *viewInternal) collectedRows() []*Row {
return v.collector.collectedRows(v.view.TagKeys)
}
func (v *viewInternal) addSample(m *tag.Map, val float64, attachments map[string]interface{}, t time.Time) {
if !v.isSubscribed() {
return
}
sig := string(encodeWithKeys(m, v.view.TagKeys))
v.collector.addSample(sig, val, attachments, t)
}
// A Data is a set of rows about usage of the single measure associated
// with the given view. Each row is specific to a unique set of tags.
type Data struct {
View *View
Start, End time.Time
Rows []*Row
}
// Row is the collected value for a specific set of key value pairs a.k.a tags.
type Row struct {
Tags []tag.Tag
Data AggregationData
}
func (r *Row) String() string {
var buffer bytes.Buffer
buffer.WriteString("{ ")
buffer.WriteString("{ ")
for _, t := range r.Tags {
buffer.WriteString(fmt.Sprintf("{%v %v}", t.Key.Name(), t.Value))
}
buffer.WriteString(" }")
buffer.WriteString(fmt.Sprintf("%v", r.Data))
buffer.WriteString(" }")
return buffer.String()
}
// Equal returns true if both rows are equal. Tags are expected to be ordered
// by the key name. Even both rows have the same tags but the tags appear in
// different orders it will return false.
func (r *Row) Equal(other *Row) bool {
if r == other {
return true
}
return reflect.DeepEqual(r.Tags, other.Tags) && r.Data.equal(other.Data)
}
const maxNameLength = 255
// Returns true if the given string contains only printable characters.
func isPrintable(str string) bool {
for _, r := range str {
if !(r >= ' ' && r <= '~') {
return false
}
}
return true
}
func checkViewName(name string) error {
if len(name) > maxNameLength {
return fmt.Errorf("view name cannot be larger than %v", maxNameLength)
}
if !isPrintable(name) {
return fmt.Errorf("view name needs to be an ASCII string")
}
return nil
}

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// Copyright 2019, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package view
import (
"time"
"go.opencensus.io/metric/metricdata"
"go.opencensus.io/stats"
)
func getUnit(unit string) metricdata.Unit {
switch unit {
case "1":
return metricdata.UnitDimensionless
case "ms":
return metricdata.UnitMilliseconds
case "By":
return metricdata.UnitBytes
}
return metricdata.UnitDimensionless
}
func getType(v *View) metricdata.Type {
m := v.Measure
agg := v.Aggregation
switch agg.Type {
case AggTypeSum:
switch m.(type) {
case *stats.Int64Measure:
return metricdata.TypeCumulativeInt64
case *stats.Float64Measure:
return metricdata.TypeCumulativeFloat64
default:
panic("unexpected measure type")
}
case AggTypeDistribution:
return metricdata.TypeCumulativeDistribution
case AggTypeLastValue:
switch m.(type) {
case *stats.Int64Measure:
return metricdata.TypeGaugeInt64
case *stats.Float64Measure:
return metricdata.TypeGaugeFloat64
default:
panic("unexpected measure type")
}
case AggTypeCount:
switch m.(type) {
case *stats.Int64Measure:
return metricdata.TypeCumulativeInt64
case *stats.Float64Measure:
return metricdata.TypeCumulativeInt64
default:
panic("unexpected measure type")
}
default:
panic("unexpected aggregation type")
}
}
func getLableKeys(v *View) []metricdata.LabelKey {
labelKeys := []metricdata.LabelKey{}
for _, k := range v.TagKeys {
labelKeys = append(labelKeys, metricdata.LabelKey{Key: k.Name()})
}
return labelKeys
}
func viewToMetricDescriptor(v *View) *metricdata.Descriptor {
return &metricdata.Descriptor{
Name: v.Name,
Description: v.Description,
Unit: getUnit(v.Measure.Unit()),
Type: getType(v),
LabelKeys: getLableKeys(v),
}
}
func toLabelValues(row *Row, expectedKeys []metricdata.LabelKey) []metricdata.LabelValue {
labelValues := []metricdata.LabelValue{}
tagMap := make(map[string]string)
for _, tag := range row.Tags {
tagMap[tag.Key.Name()] = tag.Value
}
for _, key := range expectedKeys {
if val, ok := tagMap[key.Key]; ok {
labelValues = append(labelValues, metricdata.NewLabelValue(val))
} else {
labelValues = append(labelValues, metricdata.LabelValue{})
}
}
return labelValues
}
func rowToTimeseries(v *viewInternal, row *Row, now time.Time, startTime time.Time) *metricdata.TimeSeries {
return &metricdata.TimeSeries{
Points: []metricdata.Point{row.Data.toPoint(v.metricDescriptor.Type, now)},
LabelValues: toLabelValues(row, v.metricDescriptor.LabelKeys),
StartTime: startTime,
}
}
func viewToMetric(v *viewInternal, now time.Time, startTime time.Time) *metricdata.Metric {
if v.metricDescriptor.Type == metricdata.TypeGaugeInt64 ||
v.metricDescriptor.Type == metricdata.TypeGaugeFloat64 {
startTime = time.Time{}
}
rows := v.collectedRows()
if len(rows) == 0 {
return nil
}
ts := []*metricdata.TimeSeries{}
for _, row := range rows {
ts = append(ts, rowToTimeseries(v, row, now, startTime))
}
m := &metricdata.Metric{
Descriptor: *v.metricDescriptor,
TimeSeries: ts,
}
return m
}

281
vendor/go.opencensus.io/stats/view/worker.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package view
import (
"fmt"
"sync"
"time"
"go.opencensus.io/metric/metricdata"
"go.opencensus.io/metric/metricproducer"
"go.opencensus.io/stats"
"go.opencensus.io/stats/internal"
"go.opencensus.io/tag"
)
func init() {
defaultWorker = newWorker()
go defaultWorker.start()
internal.DefaultRecorder = record
}
type measureRef struct {
measure string
views map[*viewInternal]struct{}
}
type worker struct {
measures map[string]*measureRef
views map[string]*viewInternal
startTimes map[*viewInternal]time.Time
timer *time.Ticker
c chan command
quit, done chan bool
mu sync.RWMutex
}
var defaultWorker *worker
var defaultReportingDuration = 10 * time.Second
// Find returns a registered view associated with this name.
// If no registered view is found, nil is returned.
func Find(name string) (v *View) {
req := &getViewByNameReq{
name: name,
c: make(chan *getViewByNameResp),
}
defaultWorker.c <- req
resp := <-req.c
return resp.v
}
// Register begins collecting data for the given views.
// Once a view is registered, it reports data to the registered exporters.
func Register(views ...*View) error {
req := &registerViewReq{
views: views,
err: make(chan error),
}
defaultWorker.c <- req
return <-req.err
}
// Unregister the given views. Data will not longer be exported for these views
// after Unregister returns.
// It is not necessary to unregister from views you expect to collect for the
// duration of your program execution.
func Unregister(views ...*View) {
names := make([]string, len(views))
for i := range views {
names[i] = views[i].Name
}
req := &unregisterFromViewReq{
views: names,
done: make(chan struct{}),
}
defaultWorker.c <- req
<-req.done
}
// RetrieveData gets a snapshot of the data collected for the the view registered
// with the given name. It is intended for testing only.
func RetrieveData(viewName string) ([]*Row, error) {
req := &retrieveDataReq{
now: time.Now(),
v: viewName,
c: make(chan *retrieveDataResp),
}
defaultWorker.c <- req
resp := <-req.c
return resp.rows, resp.err
}
func record(tags *tag.Map, ms interface{}, attachments map[string]interface{}) {
req := &recordReq{
tm: tags,
ms: ms.([]stats.Measurement),
attachments: attachments,
t: time.Now(),
}
defaultWorker.c <- req
}
// SetReportingPeriod sets the interval between reporting aggregated views in
// the program. If duration is less than or equal to zero, it enables the
// default behavior.
//
// Note: each exporter makes different promises about what the lowest supported
// duration is. For example, the Stackdriver exporter recommends a value no
// lower than 1 minute. Consult each exporter per your needs.
func SetReportingPeriod(d time.Duration) {
// TODO(acetechnologist): ensure that the duration d is more than a certain
// value. e.g. 1s
req := &setReportingPeriodReq{
d: d,
c: make(chan bool),
}
defaultWorker.c <- req
<-req.c // don't return until the timer is set to the new duration.
}
func newWorker() *worker {
return &worker{
measures: make(map[string]*measureRef),
views: make(map[string]*viewInternal),
startTimes: make(map[*viewInternal]time.Time),
timer: time.NewTicker(defaultReportingDuration),
c: make(chan command, 1024),
quit: make(chan bool),
done: make(chan bool),
}
}
func (w *worker) start() {
prodMgr := metricproducer.GlobalManager()
prodMgr.AddProducer(w)
for {
select {
case cmd := <-w.c:
cmd.handleCommand(w)
case <-w.timer.C:
w.reportUsage(time.Now())
case <-w.quit:
w.timer.Stop()
close(w.c)
w.done <- true
return
}
}
}
func (w *worker) stop() {
prodMgr := metricproducer.GlobalManager()
prodMgr.DeleteProducer(w)
w.quit <- true
<-w.done
}
func (w *worker) getMeasureRef(name string) *measureRef {
if mr, ok := w.measures[name]; ok {
return mr
}
mr := &measureRef{
measure: name,
views: make(map[*viewInternal]struct{}),
}
w.measures[name] = mr
return mr
}
func (w *worker) tryRegisterView(v *View) (*viewInternal, error) {
w.mu.Lock()
defer w.mu.Unlock()
vi, err := newViewInternal(v)
if err != nil {
return nil, err
}
if x, ok := w.views[vi.view.Name]; ok {
if !x.view.same(vi.view) {
return nil, fmt.Errorf("cannot register view %q; a different view with the same name is already registered", v.Name)
}
// the view is already registered so there is nothing to do and the
// command is considered successful.
return x, nil
}
w.views[vi.view.Name] = vi
ref := w.getMeasureRef(vi.view.Measure.Name())
ref.views[vi] = struct{}{}
return vi, nil
}
func (w *worker) unregisterView(viewName string) {
w.mu.Lock()
defer w.mu.Unlock()
delete(w.views, viewName)
}
func (w *worker) reportView(v *viewInternal, now time.Time) {
if !v.isSubscribed() {
return
}
rows := v.collectedRows()
_, ok := w.startTimes[v]
if !ok {
w.startTimes[v] = now
}
viewData := &Data{
View: v.view,
Start: w.startTimes[v],
End: time.Now(),
Rows: rows,
}
exportersMu.Lock()
for e := range exporters {
e.ExportView(viewData)
}
exportersMu.Unlock()
}
func (w *worker) reportUsage(now time.Time) {
w.mu.Lock()
defer w.mu.Unlock()
for _, v := range w.views {
w.reportView(v, now)
}
}
func (w *worker) toMetric(v *viewInternal, now time.Time) *metricdata.Metric {
if !v.isSubscribed() {
return nil
}
_, ok := w.startTimes[v]
if !ok {
w.startTimes[v] = now
}
var startTime time.Time
if v.metricDescriptor.Type == metricdata.TypeGaugeInt64 ||
v.metricDescriptor.Type == metricdata.TypeGaugeFloat64 {
startTime = time.Time{}
} else {
startTime = w.startTimes[v]
}
return viewToMetric(v, now, startTime)
}
// Read reads all view data and returns them as metrics.
// It is typically invoked by metric reader to export stats in metric format.
func (w *worker) Read() []*metricdata.Metric {
w.mu.Lock()
defer w.mu.Unlock()
now := time.Now()
metrics := make([]*metricdata.Metric, 0, len(w.views))
for _, v := range w.views {
metric := w.toMetric(v, now)
if metric != nil {
metrics = append(metrics, metric)
}
}
return metrics
}

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vendor/go.opencensus.io/stats/view/worker_commands.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package view
import (
"errors"
"fmt"
"strings"
"time"
"go.opencensus.io/stats"
"go.opencensus.io/stats/internal"
"go.opencensus.io/tag"
)
type command interface {
handleCommand(w *worker)
}
// getViewByNameReq is the command to get a view given its name.
type getViewByNameReq struct {
name string
c chan *getViewByNameResp
}
type getViewByNameResp struct {
v *View
}
func (cmd *getViewByNameReq) handleCommand(w *worker) {
v := w.views[cmd.name]
if v == nil {
cmd.c <- &getViewByNameResp{nil}
return
}
cmd.c <- &getViewByNameResp{v.view}
}
// registerViewReq is the command to register a view.
type registerViewReq struct {
views []*View
err chan error
}
func (cmd *registerViewReq) handleCommand(w *worker) {
for _, v := range cmd.views {
if err := v.canonicalize(); err != nil {
cmd.err <- err
return
}
}
var errstr []string
for _, view := range cmd.views {
vi, err := w.tryRegisterView(view)
if err != nil {
errstr = append(errstr, fmt.Sprintf("%s: %v", view.Name, err))
continue
}
internal.SubscriptionReporter(view.Measure.Name())
vi.subscribe()
}
if len(errstr) > 0 {
cmd.err <- errors.New(strings.Join(errstr, "\n"))
} else {
cmd.err <- nil
}
}
// unregisterFromViewReq is the command to unregister to a view. Has no
// impact on the data collection for client that are pulling data from the
// library.
type unregisterFromViewReq struct {
views []string
done chan struct{}
}
func (cmd *unregisterFromViewReq) handleCommand(w *worker) {
for _, name := range cmd.views {
vi, ok := w.views[name]
if !ok {
continue
}
// Report pending data for this view before removing it.
w.reportView(vi, time.Now())
vi.unsubscribe()
if !vi.isSubscribed() {
// this was the last subscription and view is not collecting anymore.
// The collected data can be cleared.
vi.clearRows()
}
w.unregisterView(name)
}
cmd.done <- struct{}{}
}
// retrieveDataReq is the command to retrieve data for a view.
type retrieveDataReq struct {
now time.Time
v string
c chan *retrieveDataResp
}
type retrieveDataResp struct {
rows []*Row
err error
}
func (cmd *retrieveDataReq) handleCommand(w *worker) {
w.mu.Lock()
defer w.mu.Unlock()
vi, ok := w.views[cmd.v]
if !ok {
cmd.c <- &retrieveDataResp{
nil,
fmt.Errorf("cannot retrieve data; view %q is not registered", cmd.v),
}
return
}
if !vi.isSubscribed() {
cmd.c <- &retrieveDataResp{
nil,
fmt.Errorf("cannot retrieve data; view %q has no subscriptions or collection is not forcibly started", cmd.v),
}
return
}
cmd.c <- &retrieveDataResp{
vi.collectedRows(),
nil,
}
}
// recordReq is the command to record data related to multiple measures
// at once.
type recordReq struct {
tm *tag.Map
ms []stats.Measurement
attachments map[string]interface{}
t time.Time
}
func (cmd *recordReq) handleCommand(w *worker) {
w.mu.Lock()
defer w.mu.Unlock()
for _, m := range cmd.ms {
if (m == stats.Measurement{}) { // not registered
continue
}
ref := w.getMeasureRef(m.Measure().Name())
for v := range ref.views {
v.addSample(cmd.tm, m.Value(), cmd.attachments, time.Now())
}
}
}
// setReportingPeriodReq is the command to modify the duration between
// reporting the collected data to the registered clients.
type setReportingPeriodReq struct {
d time.Duration
c chan bool
}
func (cmd *setReportingPeriodReq) handleCommand(w *worker) {
w.timer.Stop()
if cmd.d <= 0 {
w.timer = time.NewTicker(defaultReportingDuration)
} else {
w.timer = time.NewTicker(cmd.d)
}
cmd.c <- true
}

43
vendor/go.opencensus.io/tag/context.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package tag
import (
"context"
)
// FromContext returns the tag map stored in the context.
func FromContext(ctx context.Context) *Map {
// The returned tag map shouldn't be mutated.
ts := ctx.Value(mapCtxKey)
if ts == nil {
return nil
}
return ts.(*Map)
}
// NewContext creates a new context with the given tag map.
// To propagate a tag map to downstream methods and downstream RPCs, add a tag map
// to the current context. NewContext will return a copy of the current context,
// and put the tag map into the returned one.
// If there is already a tag map in the current context, it will be replaced with m.
func NewContext(ctx context.Context, m *Map) context.Context {
return context.WithValue(ctx, mapCtxKey, m)
}
type ctxKey struct{}
var mapCtxKey = ctxKey{}

26
vendor/go.opencensus.io/tag/doc.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
/*
Package tag contains OpenCensus tags.
Tags are key-value pairs. Tags provide additional cardinality to
the OpenCensus instrumentation data.
Tags can be propagated on the wire and in the same
process via context.Context. Encode and Decode should be
used to represent tags into their binary propagation form.
*/
package tag // import "go.opencensus.io/tag"

35
vendor/go.opencensus.io/tag/key.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package tag
// Key represents a tag key.
type Key struct {
name string
}
// NewKey creates or retrieves a string key identified by name.
// Calling NewKey consequently with the same name returns the same key.
func NewKey(name string) (Key, error) {
if !checkKeyName(name) {
return Key{}, errInvalidKeyName
}
return Key{name: name}, nil
}
// Name returns the name of the key.
func (k Key) Name() string {
return k.name
}

229
vendor/go.opencensus.io/tag/map.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package tag
import (
"bytes"
"context"
"fmt"
"sort"
)
// Tag is a key value pair that can be propagated on wire.
type Tag struct {
Key Key
Value string
}
type tagContent struct {
value string
m metadatas
}
// Map is a map of tags. Use New to create a context containing
// a new Map.
type Map struct {
m map[Key]tagContent
}
// Value returns the value for the key if a value for the key exists.
func (m *Map) Value(k Key) (string, bool) {
if m == nil {
return "", false
}
v, ok := m.m[k]
return v.value, ok
}
func (m *Map) String() string {
if m == nil {
return "nil"
}
keys := make([]Key, 0, len(m.m))
for k := range m.m {
keys = append(keys, k)
}
sort.Slice(keys, func(i, j int) bool { return keys[i].Name() < keys[j].Name() })
var buffer bytes.Buffer
buffer.WriteString("{ ")
for _, k := range keys {
buffer.WriteString(fmt.Sprintf("{%v %v}", k.name, m.m[k]))
}
buffer.WriteString(" }")
return buffer.String()
}
func (m *Map) insert(k Key, v string, md metadatas) {
if _, ok := m.m[k]; ok {
return
}
m.m[k] = tagContent{value: v, m: md}
}
func (m *Map) update(k Key, v string, md metadatas) {
if _, ok := m.m[k]; ok {
m.m[k] = tagContent{value: v, m: md}
}
}
func (m *Map) upsert(k Key, v string, md metadatas) {
m.m[k] = tagContent{value: v, m: md}
}
func (m *Map) delete(k Key) {
delete(m.m, k)
}
func newMap() *Map {
return &Map{m: make(map[Key]tagContent)}
}
// Mutator modifies a tag map.
type Mutator interface {
Mutate(t *Map) (*Map, error)
}
// Insert returns a mutator that inserts a
// value associated with k. If k already exists in the tag map,
// mutator doesn't update the value.
// Metadata applies metadata to the tag. It is optional.
// Metadatas are applied in the order in which it is provided.
// If more than one metadata updates the same attribute then
// the update from the last metadata prevails.
func Insert(k Key, v string, mds ...Metadata) Mutator {
return &mutator{
fn: func(m *Map) (*Map, error) {
if !checkValue(v) {
return nil, errInvalidValue
}
m.insert(k, v, createMetadatas(mds...))
return m, nil
},
}
}
// Update returns a mutator that updates the
// value of the tag associated with k with v. If k doesn't
// exists in the tag map, the mutator doesn't insert the value.
// Metadata applies metadata to the tag. It is optional.
// Metadatas are applied in the order in which it is provided.
// If more than one metadata updates the same attribute then
// the update from the last metadata prevails.
func Update(k Key, v string, mds ...Metadata) Mutator {
return &mutator{
fn: func(m *Map) (*Map, error) {
if !checkValue(v) {
return nil, errInvalidValue
}
m.update(k, v, createMetadatas(mds...))
return m, nil
},
}
}
// Upsert returns a mutator that upserts the
// value of the tag associated with k with v. It inserts the
// value if k doesn't exist already. It mutates the value
// if k already exists.
// Metadata applies metadata to the tag. It is optional.
// Metadatas are applied in the order in which it is provided.
// If more than one metadata updates the same attribute then
// the update from the last metadata prevails.
func Upsert(k Key, v string, mds ...Metadata) Mutator {
return &mutator{
fn: func(m *Map) (*Map, error) {
if !checkValue(v) {
return nil, errInvalidValue
}
m.upsert(k, v, createMetadatas(mds...))
return m, nil
},
}
}
func createMetadatas(mds ...Metadata) metadatas {
var metas metadatas
if len(mds) > 0 {
for _, md := range mds {
if md != nil {
md(&metas)
}
}
} else {
WithTTL(TTLUnlimitedPropagation)(&metas)
}
return metas
}
// Delete returns a mutator that deletes
// the value associated with k.
func Delete(k Key) Mutator {
return &mutator{
fn: func(m *Map) (*Map, error) {
m.delete(k)
return m, nil
},
}
}
// New returns a new context that contains a tag map
// originated from the incoming context and modified
// with the provided mutators.
func New(ctx context.Context, mutator ...Mutator) (context.Context, error) {
m := newMap()
orig := FromContext(ctx)
if orig != nil {
for k, v := range orig.m {
if !checkKeyName(k.Name()) {
return ctx, fmt.Errorf("key:%q: %v", k, errInvalidKeyName)
}
if !checkValue(v.value) {
return ctx, fmt.Errorf("key:%q value:%q: %v", k.Name(), v, errInvalidValue)
}
m.insert(k, v.value, v.m)
}
}
var err error
for _, mod := range mutator {
m, err = mod.Mutate(m)
if err != nil {
return ctx, err
}
}
return NewContext(ctx, m), nil
}
// Do is similar to pprof.Do: a convenience for installing the tags
// from the context as Go profiler labels. This allows you to
// correlated runtime profiling with stats.
//
// It converts the key/values from the given map to Go profiler labels
// and calls pprof.Do.
//
// Do is going to do nothing if your Go version is below 1.9.
func Do(ctx context.Context, f func(ctx context.Context)) {
do(ctx, f)
}
type mutator struct {
fn func(t *Map) (*Map, error)
}
func (m *mutator) Mutate(t *Map) (*Map, error) {
return m.fn(t)
}

239
vendor/go.opencensus.io/tag/map_codec.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package tag
import (
"encoding/binary"
"fmt"
)
// KeyType defines the types of keys allowed. Currently only keyTypeString is
// supported.
type keyType byte
const (
keyTypeString keyType = iota
keyTypeInt64
keyTypeTrue
keyTypeFalse
tagsVersionID = byte(0)
)
type encoderGRPC struct {
buf []byte
writeIdx, readIdx int
}
// writeKeyString writes the fieldID '0' followed by the key string and value
// string.
func (eg *encoderGRPC) writeTagString(k, v string) {
eg.writeByte(byte(keyTypeString))
eg.writeStringWithVarintLen(k)
eg.writeStringWithVarintLen(v)
}
func (eg *encoderGRPC) writeTagUint64(k string, i uint64) {
eg.writeByte(byte(keyTypeInt64))
eg.writeStringWithVarintLen(k)
eg.writeUint64(i)
}
func (eg *encoderGRPC) writeTagTrue(k string) {
eg.writeByte(byte(keyTypeTrue))
eg.writeStringWithVarintLen(k)
}
func (eg *encoderGRPC) writeTagFalse(k string) {
eg.writeByte(byte(keyTypeFalse))
eg.writeStringWithVarintLen(k)
}
func (eg *encoderGRPC) writeBytesWithVarintLen(bytes []byte) {
length := len(bytes)
eg.growIfRequired(binary.MaxVarintLen64 + length)
eg.writeIdx += binary.PutUvarint(eg.buf[eg.writeIdx:], uint64(length))
copy(eg.buf[eg.writeIdx:], bytes)
eg.writeIdx += length
}
func (eg *encoderGRPC) writeStringWithVarintLen(s string) {
length := len(s)
eg.growIfRequired(binary.MaxVarintLen64 + length)
eg.writeIdx += binary.PutUvarint(eg.buf[eg.writeIdx:], uint64(length))
copy(eg.buf[eg.writeIdx:], s)
eg.writeIdx += length
}
func (eg *encoderGRPC) writeByte(v byte) {
eg.growIfRequired(1)
eg.buf[eg.writeIdx] = v
eg.writeIdx++
}
func (eg *encoderGRPC) writeUint32(i uint32) {
eg.growIfRequired(4)
binary.LittleEndian.PutUint32(eg.buf[eg.writeIdx:], i)
eg.writeIdx += 4
}
func (eg *encoderGRPC) writeUint64(i uint64) {
eg.growIfRequired(8)
binary.LittleEndian.PutUint64(eg.buf[eg.writeIdx:], i)
eg.writeIdx += 8
}
func (eg *encoderGRPC) readByte() byte {
b := eg.buf[eg.readIdx]
eg.readIdx++
return b
}
func (eg *encoderGRPC) readUint32() uint32 {
i := binary.LittleEndian.Uint32(eg.buf[eg.readIdx:])
eg.readIdx += 4
return i
}
func (eg *encoderGRPC) readUint64() uint64 {
i := binary.LittleEndian.Uint64(eg.buf[eg.readIdx:])
eg.readIdx += 8
return i
}
func (eg *encoderGRPC) readBytesWithVarintLen() ([]byte, error) {
if eg.readEnded() {
return nil, fmt.Errorf("unexpected end while readBytesWithVarintLen '%x' starting at idx '%v'", eg.buf, eg.readIdx)
}
length, valueStart := binary.Uvarint(eg.buf[eg.readIdx:])
if valueStart <= 0 {
return nil, fmt.Errorf("unexpected end while readBytesWithVarintLen '%x' starting at idx '%v'", eg.buf, eg.readIdx)
}
valueStart += eg.readIdx
valueEnd := valueStart + int(length)
if valueEnd > len(eg.buf) {
return nil, fmt.Errorf("malformed encoding: length:%v, upper:%v, maxLength:%v", length, valueEnd, len(eg.buf))
}
eg.readIdx = valueEnd
return eg.buf[valueStart:valueEnd], nil
}
func (eg *encoderGRPC) readStringWithVarintLen() (string, error) {
bytes, err := eg.readBytesWithVarintLen()
if err != nil {
return "", err
}
return string(bytes), nil
}
func (eg *encoderGRPC) growIfRequired(expected int) {
if len(eg.buf)-eg.writeIdx < expected {
tmp := make([]byte, 2*(len(eg.buf)+1)+expected)
copy(tmp, eg.buf)
eg.buf = tmp
}
}
func (eg *encoderGRPC) readEnded() bool {
return eg.readIdx >= len(eg.buf)
}
func (eg *encoderGRPC) bytes() []byte {
return eg.buf[:eg.writeIdx]
}
// Encode encodes the tag map into a []byte. It is useful to propagate
// the tag maps on wire in binary format.
func Encode(m *Map) []byte {
if m == nil {
return nil
}
eg := &encoderGRPC{
buf: make([]byte, len(m.m)),
}
eg.writeByte(byte(tagsVersionID))
for k, v := range m.m {
if v.m.ttl.ttl == valueTTLUnlimitedPropagation {
eg.writeByte(byte(keyTypeString))
eg.writeStringWithVarintLen(k.name)
eg.writeBytesWithVarintLen([]byte(v.value))
}
}
return eg.bytes()
}
// Decode decodes the given []byte into a tag map.
func Decode(bytes []byte) (*Map, error) {
ts := newMap()
err := DecodeEach(bytes, ts.upsert)
if err != nil {
// no partial failures
return nil, err
}
return ts, nil
}
// DecodeEach decodes the given serialized tag map, calling handler for each
// tag key and value decoded.
func DecodeEach(bytes []byte, fn func(key Key, val string, md metadatas)) error {
eg := &encoderGRPC{
buf: bytes,
}
if len(eg.buf) == 0 {
return nil
}
version := eg.readByte()
if version > tagsVersionID {
return fmt.Errorf("cannot decode: unsupported version: %q; supports only up to: %q", version, tagsVersionID)
}
for !eg.readEnded() {
typ := keyType(eg.readByte())
if typ != keyTypeString {
return fmt.Errorf("cannot decode: invalid key type: %q", typ)
}
k, err := eg.readBytesWithVarintLen()
if err != nil {
return err
}
v, err := eg.readBytesWithVarintLen()
if err != nil {
return err
}
key, err := NewKey(string(k))
if err != nil {
return err
}
val := string(v)
if !checkValue(val) {
return errInvalidValue
}
fn(key, val, createMetadatas(WithTTL(TTLUnlimitedPropagation)))
if err != nil {
return err
}
}
return nil
}

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vendor/go.opencensus.io/tag/metadata.go generated vendored Normal file
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// Copyright 2019, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package tag
const (
// valueTTLNoPropagation prevents tag from propagating.
valueTTLNoPropagation = 0
// valueTTLUnlimitedPropagation allows tag to propagate without any limits on number of hops.
valueTTLUnlimitedPropagation = -1
)
// TTL is metadata that specifies number of hops a tag can propagate.
// Details about TTL metadata is specified at https://github.com/census-instrumentation/opencensus-specs/blob/master/tags/TagMap.md#tagmetadata
type TTL struct {
ttl int
}
var (
// TTLUnlimitedPropagation is TTL metadata that allows tag to propagate without any limits on number of hops.
TTLUnlimitedPropagation = TTL{ttl: valueTTLUnlimitedPropagation}
// TTLNoPropagation is TTL metadata that prevents tag from propagating.
TTLNoPropagation = TTL{ttl: valueTTLNoPropagation}
)
type metadatas struct {
ttl TTL
}
// Metadata applies metadatas specified by the function.
type Metadata func(*metadatas)
// WithTTL applies metadata with provided ttl.
func WithTTL(ttl TTL) Metadata {
return func(m *metadatas) {
m.ttl = ttl
}
}

31
vendor/go.opencensus.io/tag/profile_19.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build go1.9
package tag
import (
"context"
"runtime/pprof"
)
func do(ctx context.Context, f func(ctx context.Context)) {
m := FromContext(ctx)
keyvals := make([]string, 0, 2*len(m.m))
for k, v := range m.m {
keyvals = append(keyvals, k.Name(), v.value)
}
pprof.Do(ctx, pprof.Labels(keyvals...), f)
}

23
vendor/go.opencensus.io/tag/profile_not19.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !go1.9
package tag
import "context"
func do(ctx context.Context, f func(ctx context.Context)) {
f(ctx)
}

56
vendor/go.opencensus.io/tag/validate.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tag
import "errors"
const (
maxKeyLength = 255
// valid are restricted to US-ASCII subset (range 0x20 (' ') to 0x7e ('~')).
validKeyValueMin = 32
validKeyValueMax = 126
)
var (
errInvalidKeyName = errors.New("invalid key name: only ASCII characters accepted; max length must be 255 characters")
errInvalidValue = errors.New("invalid value: only ASCII characters accepted; max length must be 255 characters")
)
func checkKeyName(name string) bool {
if len(name) == 0 {
return false
}
if len(name) > maxKeyLength {
return false
}
return isASCII(name)
}
func isASCII(s string) bool {
for _, c := range s {
if (c < validKeyValueMin) || (c > validKeyValueMax) {
return false
}
}
return true
}
func checkValue(v string) bool {
if len(v) > maxKeyLength {
return false
}
return isASCII(v)
}

119
vendor/go.opencensus.io/trace/basetypes.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace
import (
"fmt"
"time"
)
type (
// TraceID is a 16-byte identifier for a set of spans.
TraceID [16]byte
// SpanID is an 8-byte identifier for a single span.
SpanID [8]byte
)
func (t TraceID) String() string {
return fmt.Sprintf("%02x", t[:])
}
func (s SpanID) String() string {
return fmt.Sprintf("%02x", s[:])
}
// Annotation represents a text annotation with a set of attributes and a timestamp.
type Annotation struct {
Time time.Time
Message string
Attributes map[string]interface{}
}
// Attribute represents a key-value pair on a span, link or annotation.
// Construct with one of: BoolAttribute, Int64Attribute, or StringAttribute.
type Attribute struct {
key string
value interface{}
}
// BoolAttribute returns a bool-valued attribute.
func BoolAttribute(key string, value bool) Attribute {
return Attribute{key: key, value: value}
}
// Int64Attribute returns an int64-valued attribute.
func Int64Attribute(key string, value int64) Attribute {
return Attribute{key: key, value: value}
}
// Float64Attribute returns a float64-valued attribute.
func Float64Attribute(key string, value float64) Attribute {
return Attribute{key: key, value: value}
}
// StringAttribute returns a string-valued attribute.
func StringAttribute(key string, value string) Attribute {
return Attribute{key: key, value: value}
}
// LinkType specifies the relationship between the span that had the link
// added, and the linked span.
type LinkType int32
// LinkType values.
const (
LinkTypeUnspecified LinkType = iota // The relationship of the two spans is unknown.
LinkTypeChild // The linked span is a child of the current span.
LinkTypeParent // The linked span is the parent of the current span.
)
// Link represents a reference from one span to another span.
type Link struct {
TraceID TraceID
SpanID SpanID
Type LinkType
// Attributes is a set of attributes on the link.
Attributes map[string]interface{}
}
// MessageEventType specifies the type of message event.
type MessageEventType int32
// MessageEventType values.
const (
MessageEventTypeUnspecified MessageEventType = iota // Unknown event type.
MessageEventTypeSent // Indicates a sent RPC message.
MessageEventTypeRecv // Indicates a received RPC message.
)
// MessageEvent represents an event describing a message sent or received on the network.
type MessageEvent struct {
Time time.Time
EventType MessageEventType
MessageID int64
UncompressedByteSize int64
CompressedByteSize int64
}
// Status is the status of a Span.
type Status struct {
// Code is a status code. Zero indicates success.
//
// If Code will be propagated to Google APIs, it ideally should be a value from
// https://github.com/googleapis/googleapis/blob/master/google/rpc/code.proto .
Code int32
Message string
}

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vendor/go.opencensus.io/trace/config.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace
import (
"sync"
"go.opencensus.io/trace/internal"
)
// Config represents the global tracing configuration.
type Config struct {
// DefaultSampler is the default sampler used when creating new spans.
DefaultSampler Sampler
// IDGenerator is for internal use only.
IDGenerator internal.IDGenerator
// MaxAnnotationEventsPerSpan is max number of annotation events per span
MaxAnnotationEventsPerSpan int
// MaxMessageEventsPerSpan is max number of message events per span
MaxMessageEventsPerSpan int
// MaxAnnotationEventsPerSpan is max number of attributes per span
MaxAttributesPerSpan int
// MaxLinksPerSpan is max number of links per span
MaxLinksPerSpan int
}
var configWriteMu sync.Mutex
const (
// DefaultMaxAnnotationEventsPerSpan is default max number of annotation events per span
DefaultMaxAnnotationEventsPerSpan = 32
// DefaultMaxMessageEventsPerSpan is default max number of message events per span
DefaultMaxMessageEventsPerSpan = 128
// DefaultMaxAttributesPerSpan is default max number of attributes per span
DefaultMaxAttributesPerSpan = 32
// DefaultMaxLinksPerSpan is default max number of links per span
DefaultMaxLinksPerSpan = 32
)
// ApplyConfig applies changes to the global tracing configuration.
//
// Fields not provided in the given config are going to be preserved.
func ApplyConfig(cfg Config) {
configWriteMu.Lock()
defer configWriteMu.Unlock()
c := *config.Load().(*Config)
if cfg.DefaultSampler != nil {
c.DefaultSampler = cfg.DefaultSampler
}
if cfg.IDGenerator != nil {
c.IDGenerator = cfg.IDGenerator
}
if cfg.MaxAnnotationEventsPerSpan > 0 {
c.MaxAnnotationEventsPerSpan = cfg.MaxAnnotationEventsPerSpan
}
if cfg.MaxMessageEventsPerSpan > 0 {
c.MaxMessageEventsPerSpan = cfg.MaxMessageEventsPerSpan
}
if cfg.MaxAttributesPerSpan > 0 {
c.MaxAttributesPerSpan = cfg.MaxAttributesPerSpan
}
if cfg.MaxLinksPerSpan > 0 {
c.MaxLinksPerSpan = cfg.MaxLinksPerSpan
}
config.Store(&c)
}

53
vendor/go.opencensus.io/trace/doc.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/*
Package trace contains support for OpenCensus distributed tracing.
The following assumes a basic familiarity with OpenCensus concepts.
See http://opencensus.io
Exporting Traces
To export collected tracing data, register at least one exporter. You can use
one of the provided exporters or write your own.
trace.RegisterExporter(exporter)
By default, traces will be sampled relatively rarely. To change the sampling
frequency for your entire program, call ApplyConfig. Use a ProbabilitySampler
to sample a subset of traces, or use AlwaysSample to collect a trace on every run:
trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
Be careful about using trace.AlwaysSample in a production application with
significant traffic: a new trace will be started and exported for every request.
Adding Spans to a Trace
A trace consists of a tree of spans. In Go, the current span is carried in a
context.Context.
It is common to want to capture all the activity of a function call in a span. For
this to work, the function must take a context.Context as a parameter. Add these two
lines to the top of the function:
ctx, span := trace.StartSpan(ctx, "example.com/Run")
defer span.End()
StartSpan will create a new top-level span if the context
doesn't contain another span, otherwise it will create a child span.
*/
package trace // import "go.opencensus.io/trace"

38
vendor/go.opencensus.io/trace/evictedqueue.go generated vendored Normal file
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// Copyright 2019, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace
type evictedQueue struct {
queue []interface{}
capacity int
droppedCount int
}
func newEvictedQueue(capacity int) *evictedQueue {
eq := &evictedQueue{
capacity: capacity,
queue: make([]interface{}, 0),
}
return eq
}
func (eq *evictedQueue) add(value interface{}) {
if len(eq.queue) == eq.capacity {
eq.queue = eq.queue[1:]
eq.droppedCount++
}
eq.queue = append(eq.queue, value)
}

97
vendor/go.opencensus.io/trace/export.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace
import (
"sync"
"sync/atomic"
"time"
)
// Exporter is a type for functions that receive sampled trace spans.
//
// The ExportSpan method should be safe for concurrent use and should return
// quickly; if an Exporter takes a significant amount of time to process a
// SpanData, that work should be done on another goroutine.
//
// The SpanData should not be modified, but a pointer to it can be kept.
type Exporter interface {
ExportSpan(s *SpanData)
}
type exportersMap map[Exporter]struct{}
var (
exporterMu sync.Mutex
exporters atomic.Value
)
// RegisterExporter adds to the list of Exporters that will receive sampled
// trace spans.
//
// Binaries can register exporters, libraries shouldn't register exporters.
func RegisterExporter(e Exporter) {
exporterMu.Lock()
new := make(exportersMap)
if old, ok := exporters.Load().(exportersMap); ok {
for k, v := range old {
new[k] = v
}
}
new[e] = struct{}{}
exporters.Store(new)
exporterMu.Unlock()
}
// UnregisterExporter removes from the list of Exporters the Exporter that was
// registered with the given name.
func UnregisterExporter(e Exporter) {
exporterMu.Lock()
new := make(exportersMap)
if old, ok := exporters.Load().(exportersMap); ok {
for k, v := range old {
new[k] = v
}
}
delete(new, e)
exporters.Store(new)
exporterMu.Unlock()
}
// SpanData contains all the information collected by a Span.
type SpanData struct {
SpanContext
ParentSpanID SpanID
SpanKind int
Name string
StartTime time.Time
// The wall clock time of EndTime will be adjusted to always be offset
// from StartTime by the duration of the span.
EndTime time.Time
// The values of Attributes each have type string, bool, or int64.
Attributes map[string]interface{}
Annotations []Annotation
MessageEvents []MessageEvent
Status
Links []Link
HasRemoteParent bool
DroppedAttributeCount int
DroppedAnnotationCount int
DroppedMessageEventCount int
DroppedLinkCount int
// ChildSpanCount holds the number of child span created for this span.
ChildSpanCount int
}

22
vendor/go.opencensus.io/trace/internal/internal.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package internal provides trace internals.
package internal
// IDGenerator allows custom generators for TraceId and SpanId.
type IDGenerator interface {
NewTraceID() [16]byte
NewSpanID() [8]byte
}

37
vendor/go.opencensus.io/trace/lrumap.go generated vendored Normal file
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// Copyright 2019, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace
import (
"github.com/hashicorp/golang-lru/simplelru"
)
type lruMap struct {
simpleLruMap *simplelru.LRU
droppedCount int
}
func newLruMap(size int) *lruMap {
lm := &lruMap{}
lm.simpleLruMap, _ = simplelru.NewLRU(size, nil)
return lm
}
func (lm *lruMap) add(key, value interface{}) {
evicted := lm.simpleLruMap.Add(key, value)
if evicted {
lm.droppedCount++
}
}

108
vendor/go.opencensus.io/trace/propagation/propagation.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package propagation implements the binary trace context format.
package propagation // import "go.opencensus.io/trace/propagation"
// TODO: link to external spec document.
// BinaryFormat format:
//
// Binary value: <version_id><version_format>
// version_id: 1 byte representing the version id.
//
// For version_id = 0:
//
// version_format: <field><field>
// field_format: <field_id><field_format>
//
// Fields:
//
// TraceId: (field_id = 0, len = 16, default = "0000000000000000") - 16-byte array representing the trace_id.
// SpanId: (field_id = 1, len = 8, default = "00000000") - 8-byte array representing the span_id.
// TraceOptions: (field_id = 2, len = 1, default = "0") - 1-byte array representing the trace_options.
//
// Fields MUST be encoded using the field id order (smaller to higher).
//
// Valid value example:
//
// {0, 0, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 1, 97,
// 98, 99, 100, 101, 102, 103, 104, 2, 1}
//
// version_id = 0;
// trace_id = {64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79}
// span_id = {97, 98, 99, 100, 101, 102, 103, 104};
// trace_options = {1};
import (
"net/http"
"go.opencensus.io/trace"
)
// Binary returns the binary format representation of a SpanContext.
//
// If sc is the zero value, Binary returns nil.
func Binary(sc trace.SpanContext) []byte {
if sc == (trace.SpanContext{}) {
return nil
}
var b [29]byte
copy(b[2:18], sc.TraceID[:])
b[18] = 1
copy(b[19:27], sc.SpanID[:])
b[27] = 2
b[28] = uint8(sc.TraceOptions)
return b[:]
}
// FromBinary returns the SpanContext represented by b.
//
// If b has an unsupported version ID or contains no TraceID, FromBinary
// returns with ok==false.
func FromBinary(b []byte) (sc trace.SpanContext, ok bool) {
if len(b) == 0 || b[0] != 0 {
return trace.SpanContext{}, false
}
b = b[1:]
if len(b) >= 17 && b[0] == 0 {
copy(sc.TraceID[:], b[1:17])
b = b[17:]
} else {
return trace.SpanContext{}, false
}
if len(b) >= 9 && b[0] == 1 {
copy(sc.SpanID[:], b[1:9])
b = b[9:]
}
if len(b) >= 2 && b[0] == 2 {
sc.TraceOptions = trace.TraceOptions(b[1])
}
return sc, true
}
// HTTPFormat implementations propagate span contexts
// in HTTP requests.
//
// SpanContextFromRequest extracts a span context from incoming
// requests.
//
// SpanContextToRequest modifies the given request to include the given
// span context.
type HTTPFormat interface {
SpanContextFromRequest(req *http.Request) (sc trace.SpanContext, ok bool)
SpanContextToRequest(sc trace.SpanContext, req *http.Request)
}
// TODO(jbd): Find a more representative but short name for HTTPFormat.

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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace
import (
"encoding/binary"
)
const defaultSamplingProbability = 1e-4
// Sampler decides whether a trace should be sampled and exported.
type Sampler func(SamplingParameters) SamplingDecision
// SamplingParameters contains the values passed to a Sampler.
type SamplingParameters struct {
ParentContext SpanContext
TraceID TraceID
SpanID SpanID
Name string
HasRemoteParent bool
}
// SamplingDecision is the value returned by a Sampler.
type SamplingDecision struct {
Sample bool
}
// ProbabilitySampler returns a Sampler that samples a given fraction of traces.
//
// It also samples spans whose parents are sampled.
func ProbabilitySampler(fraction float64) Sampler {
if !(fraction >= 0) {
fraction = 0
} else if fraction >= 1 {
return AlwaysSample()
}
traceIDUpperBound := uint64(fraction * (1 << 63))
return Sampler(func(p SamplingParameters) SamplingDecision {
if p.ParentContext.IsSampled() {
return SamplingDecision{Sample: true}
}
x := binary.BigEndian.Uint64(p.TraceID[0:8]) >> 1
return SamplingDecision{Sample: x < traceIDUpperBound}
})
}
// AlwaysSample returns a Sampler that samples every trace.
// Be careful about using this sampler in a production application with
// significant traffic: a new trace will be started and exported for every
// request.
func AlwaysSample() Sampler {
return func(p SamplingParameters) SamplingDecision {
return SamplingDecision{Sample: true}
}
}
// NeverSample returns a Sampler that samples no traces.
func NeverSample() Sampler {
return func(p SamplingParameters) SamplingDecision {
return SamplingDecision{Sample: false}
}
}

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vendor/go.opencensus.io/trace/spanbucket.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace
import (
"time"
)
// samplePeriod is the minimum time between accepting spans in a single bucket.
const samplePeriod = time.Second
// defaultLatencies contains the default latency bucket bounds.
// TODO: consider defaults, make configurable
var defaultLatencies = [...]time.Duration{
10 * time.Microsecond,
100 * time.Microsecond,
time.Millisecond,
10 * time.Millisecond,
100 * time.Millisecond,
time.Second,
10 * time.Second,
time.Minute,
}
// bucket is a container for a set of spans for a particular error code or latency range.
type bucket struct {
nextTime time.Time // next time we can accept a span
buffer []*SpanData // circular buffer of spans
nextIndex int // location next SpanData should be placed in buffer
overflow bool // whether the circular buffer has wrapped around
}
func makeBucket(bufferSize int) bucket {
return bucket{
buffer: make([]*SpanData, bufferSize),
}
}
// add adds a span to the bucket, if nextTime has been reached.
func (b *bucket) add(s *SpanData) {
if s.EndTime.Before(b.nextTime) {
return
}
if len(b.buffer) == 0 {
return
}
b.nextTime = s.EndTime.Add(samplePeriod)
b.buffer[b.nextIndex] = s
b.nextIndex++
if b.nextIndex == len(b.buffer) {
b.nextIndex = 0
b.overflow = true
}
}
// size returns the number of spans in the bucket.
func (b *bucket) size() int {
if b.overflow {
return len(b.buffer)
}
return b.nextIndex
}
// span returns the ith span in the bucket.
func (b *bucket) span(i int) *SpanData {
if !b.overflow {
return b.buffer[i]
}
if i < len(b.buffer)-b.nextIndex {
return b.buffer[b.nextIndex+i]
}
return b.buffer[b.nextIndex+i-len(b.buffer)]
}
// resize changes the size of the bucket to n, keeping up to n existing spans.
func (b *bucket) resize(n int) {
cur := b.size()
newBuffer := make([]*SpanData, n)
if cur < n {
for i := 0; i < cur; i++ {
newBuffer[i] = b.span(i)
}
b.buffer = newBuffer
b.nextIndex = cur
b.overflow = false
return
}
for i := 0; i < n; i++ {
newBuffer[i] = b.span(i + cur - n)
}
b.buffer = newBuffer
b.nextIndex = 0
b.overflow = true
}
// latencyBucket returns the appropriate bucket number for a given latency.
func latencyBucket(latency time.Duration) int {
i := 0
for i < len(defaultLatencies) && latency >= defaultLatencies[i] {
i++
}
return i
}
// latencyBucketBounds returns the lower and upper bounds for a latency bucket
// number.
//
// The lower bound is inclusive, the upper bound is exclusive (except for the
// last bucket.)
func latencyBucketBounds(index int) (lower time.Duration, upper time.Duration) {
if index == 0 {
return 0, defaultLatencies[index]
}
if index == len(defaultLatencies) {
return defaultLatencies[index-1], 1<<63 - 1
}
return defaultLatencies[index-1], defaultLatencies[index]
}

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vendor/go.opencensus.io/trace/spanstore.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace
import (
"sync"
"time"
"go.opencensus.io/internal"
)
const (
maxBucketSize = 100000
defaultBucketSize = 10
)
var (
ssmu sync.RWMutex // protects spanStores
spanStores = make(map[string]*spanStore)
)
// This exists purely to avoid exposing internal methods used by z-Pages externally.
type internalOnly struct{}
func init() {
//TODO(#412): remove
internal.Trace = &internalOnly{}
}
// ReportActiveSpans returns the active spans for the given name.
func (i internalOnly) ReportActiveSpans(name string) []*SpanData {
s := spanStoreForName(name)
if s == nil {
return nil
}
var out []*SpanData
s.mu.Lock()
defer s.mu.Unlock()
for span := range s.active {
out = append(out, span.makeSpanData())
}
return out
}
// ReportSpansByError returns a sample of error spans.
//
// If code is nonzero, only spans with that status code are returned.
func (i internalOnly) ReportSpansByError(name string, code int32) []*SpanData {
s := spanStoreForName(name)
if s == nil {
return nil
}
var out []*SpanData
s.mu.Lock()
defer s.mu.Unlock()
if code != 0 {
if b, ok := s.errors[code]; ok {
for _, sd := range b.buffer {
if sd == nil {
break
}
out = append(out, sd)
}
}
} else {
for _, b := range s.errors {
for _, sd := range b.buffer {
if sd == nil {
break
}
out = append(out, sd)
}
}
}
return out
}
// ConfigureBucketSizes sets the number of spans to keep per latency and error
// bucket for different span names.
func (i internalOnly) ConfigureBucketSizes(bcs []internal.BucketConfiguration) {
for _, bc := range bcs {
latencyBucketSize := bc.MaxRequestsSucceeded
if latencyBucketSize < 0 {
latencyBucketSize = 0
}
if latencyBucketSize > maxBucketSize {
latencyBucketSize = maxBucketSize
}
errorBucketSize := bc.MaxRequestsErrors
if errorBucketSize < 0 {
errorBucketSize = 0
}
if errorBucketSize > maxBucketSize {
errorBucketSize = maxBucketSize
}
spanStoreSetSize(bc.Name, latencyBucketSize, errorBucketSize)
}
}
// ReportSpansPerMethod returns a summary of what spans are being stored for each span name.
func (i internalOnly) ReportSpansPerMethod() map[string]internal.PerMethodSummary {
out := make(map[string]internal.PerMethodSummary)
ssmu.RLock()
defer ssmu.RUnlock()
for name, s := range spanStores {
s.mu.Lock()
p := internal.PerMethodSummary{
Active: len(s.active),
}
for code, b := range s.errors {
p.ErrorBuckets = append(p.ErrorBuckets, internal.ErrorBucketSummary{
ErrorCode: code,
Size: b.size(),
})
}
for i, b := range s.latency {
min, max := latencyBucketBounds(i)
p.LatencyBuckets = append(p.LatencyBuckets, internal.LatencyBucketSummary{
MinLatency: min,
MaxLatency: max,
Size: b.size(),
})
}
s.mu.Unlock()
out[name] = p
}
return out
}
// ReportSpansByLatency returns a sample of successful spans.
//
// minLatency is the minimum latency of spans to be returned.
// maxLatency, if nonzero, is the maximum latency of spans to be returned.
func (i internalOnly) ReportSpansByLatency(name string, minLatency, maxLatency time.Duration) []*SpanData {
s := spanStoreForName(name)
if s == nil {
return nil
}
var out []*SpanData
s.mu.Lock()
defer s.mu.Unlock()
for i, b := range s.latency {
min, max := latencyBucketBounds(i)
if i+1 != len(s.latency) && max <= minLatency {
continue
}
if maxLatency != 0 && maxLatency < min {
continue
}
for _, sd := range b.buffer {
if sd == nil {
break
}
if minLatency != 0 || maxLatency != 0 {
d := sd.EndTime.Sub(sd.StartTime)
if d < minLatency {
continue
}
if maxLatency != 0 && d > maxLatency {
continue
}
}
out = append(out, sd)
}
}
return out
}
// spanStore keeps track of spans stored for a particular span name.
//
// It contains all active spans; a sample of spans for failed requests,
// categorized by error code; and a sample of spans for successful requests,
// bucketed by latency.
type spanStore struct {
mu sync.Mutex // protects everything below.
active map[*Span]struct{}
errors map[int32]*bucket
latency []bucket
maxSpansPerErrorBucket int
}
// newSpanStore creates a span store.
func newSpanStore(name string, latencyBucketSize int, errorBucketSize int) *spanStore {
s := &spanStore{
active: make(map[*Span]struct{}),
latency: make([]bucket, len(defaultLatencies)+1),
maxSpansPerErrorBucket: errorBucketSize,
}
for i := range s.latency {
s.latency[i] = makeBucket(latencyBucketSize)
}
return s
}
// spanStoreForName returns the spanStore for the given name.
//
// It returns nil if it doesn't exist.
func spanStoreForName(name string) *spanStore {
var s *spanStore
ssmu.RLock()
s, _ = spanStores[name]
ssmu.RUnlock()
return s
}
// spanStoreForNameCreateIfNew returns the spanStore for the given name.
//
// It creates it if it didn't exist.
func spanStoreForNameCreateIfNew(name string) *spanStore {
ssmu.RLock()
s, ok := spanStores[name]
ssmu.RUnlock()
if ok {
return s
}
ssmu.Lock()
defer ssmu.Unlock()
s, ok = spanStores[name]
if ok {
return s
}
s = newSpanStore(name, defaultBucketSize, defaultBucketSize)
spanStores[name] = s
return s
}
// spanStoreSetSize resizes the spanStore for the given name.
//
// It creates it if it didn't exist.
func spanStoreSetSize(name string, latencyBucketSize int, errorBucketSize int) {
ssmu.RLock()
s, ok := spanStores[name]
ssmu.RUnlock()
if ok {
s.resize(latencyBucketSize, errorBucketSize)
return
}
ssmu.Lock()
defer ssmu.Unlock()
s, ok = spanStores[name]
if ok {
s.resize(latencyBucketSize, errorBucketSize)
return
}
s = newSpanStore(name, latencyBucketSize, errorBucketSize)
spanStores[name] = s
}
func (s *spanStore) resize(latencyBucketSize int, errorBucketSize int) {
s.mu.Lock()
for i := range s.latency {
s.latency[i].resize(latencyBucketSize)
}
for _, b := range s.errors {
b.resize(errorBucketSize)
}
s.maxSpansPerErrorBucket = errorBucketSize
s.mu.Unlock()
}
// add adds a span to the active bucket of the spanStore.
func (s *spanStore) add(span *Span) {
s.mu.Lock()
s.active[span] = struct{}{}
s.mu.Unlock()
}
// finished removes a span from the active set, and adds a corresponding
// SpanData to a latency or error bucket.
func (s *spanStore) finished(span *Span, sd *SpanData) {
latency := sd.EndTime.Sub(sd.StartTime)
if latency < 0 {
latency = 0
}
code := sd.Status.Code
s.mu.Lock()
delete(s.active, span)
if code == 0 {
s.latency[latencyBucket(latency)].add(sd)
} else {
if s.errors == nil {
s.errors = make(map[int32]*bucket)
}
if b := s.errors[code]; b != nil {
b.add(sd)
} else {
b := makeBucket(s.maxSpansPerErrorBucket)
s.errors[code] = &b
b.add(sd)
}
}
s.mu.Unlock()
}

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vendor/go.opencensus.io/trace/status_codes.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace
// Status codes for use with Span.SetStatus. These correspond to the status
// codes used by gRPC defined here: https://github.com/googleapis/googleapis/blob/master/google/rpc/code.proto
const (
StatusCodeOK = 0
StatusCodeCancelled = 1
StatusCodeUnknown = 2
StatusCodeInvalidArgument = 3
StatusCodeDeadlineExceeded = 4
StatusCodeNotFound = 5
StatusCodeAlreadyExists = 6
StatusCodePermissionDenied = 7
StatusCodeResourceExhausted = 8
StatusCodeFailedPrecondition = 9
StatusCodeAborted = 10
StatusCodeOutOfRange = 11
StatusCodeUnimplemented = 12
StatusCodeInternal = 13
StatusCodeUnavailable = 14
StatusCodeDataLoss = 15
StatusCodeUnauthenticated = 16
)

598
vendor/go.opencensus.io/trace/trace.go generated vendored Normal file
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace
import (
"context"
crand "crypto/rand"
"encoding/binary"
"fmt"
"math/rand"
"sync"
"sync/atomic"
"time"
"go.opencensus.io/internal"
"go.opencensus.io/trace/tracestate"
)
// Span represents a span of a trace. It has an associated SpanContext, and
// stores data accumulated while the span is active.
//
// Ideally users should interact with Spans by calling the functions in this
// package that take a Context parameter.
type Span struct {
// data contains information recorded about the span.
//
// It will be non-nil if we are exporting the span or recording events for it.
// Otherwise, data is nil, and the Span is simply a carrier for the
// SpanContext, so that the trace ID is propagated.
data *SpanData
mu sync.Mutex // protects the contents of *data (but not the pointer value.)
spanContext SpanContext
// lruAttributes are capped at configured limit. When the capacity is reached an oldest entry
// is removed to create room for a new entry.
lruAttributes *lruMap
// annotations are stored in FIFO queue capped by configured limit.
annotations *evictedQueue
// messageEvents are stored in FIFO queue capped by configured limit.
messageEvents *evictedQueue
// links are stored in FIFO queue capped by configured limit.
links *evictedQueue
// spanStore is the spanStore this span belongs to, if any, otherwise it is nil.
*spanStore
endOnce sync.Once
executionTracerTaskEnd func() // ends the execution tracer span
}
// IsRecordingEvents returns true if events are being recorded for this span.
// Use this check to avoid computing expensive annotations when they will never
// be used.
func (s *Span) IsRecordingEvents() bool {
if s == nil {
return false
}
return s.data != nil
}
// TraceOptions contains options associated with a trace span.
type TraceOptions uint32
// IsSampled returns true if the span will be exported.
func (sc SpanContext) IsSampled() bool {
return sc.TraceOptions.IsSampled()
}
// setIsSampled sets the TraceOptions bit that determines whether the span will be exported.
func (sc *SpanContext) setIsSampled(sampled bool) {
if sampled {
sc.TraceOptions |= 1
} else {
sc.TraceOptions &= ^TraceOptions(1)
}
}
// IsSampled returns true if the span will be exported.
func (t TraceOptions) IsSampled() bool {
return t&1 == 1
}
// SpanContext contains the state that must propagate across process boundaries.
//
// SpanContext is not an implementation of context.Context.
// TODO: add reference to external Census docs for SpanContext.
type SpanContext struct {
TraceID TraceID
SpanID SpanID
TraceOptions TraceOptions
Tracestate *tracestate.Tracestate
}
type contextKey struct{}
// FromContext returns the Span stored in a context, or nil if there isn't one.
func FromContext(ctx context.Context) *Span {
s, _ := ctx.Value(contextKey{}).(*Span)
return s
}
// NewContext returns a new context with the given Span attached.
func NewContext(parent context.Context, s *Span) context.Context {
return context.WithValue(parent, contextKey{}, s)
}
// All available span kinds. Span kind must be either one of these values.
const (
SpanKindUnspecified = iota
SpanKindServer
SpanKindClient
)
// StartOptions contains options concerning how a span is started.
type StartOptions struct {
// Sampler to consult for this Span. If provided, it is always consulted.
//
// If not provided, then the behavior differs based on whether
// the parent of this Span is remote, local, or there is no parent.
// In the case of a remote parent or no parent, the
// default sampler (see Config) will be consulted. Otherwise,
// when there is a non-remote parent, no new sampling decision will be made:
// we will preserve the sampling of the parent.
Sampler Sampler
// SpanKind represents the kind of a span. If none is set,
// SpanKindUnspecified is used.
SpanKind int
}
// StartOption apply changes to StartOptions.
type StartOption func(*StartOptions)
// WithSpanKind makes new spans to be created with the given kind.
func WithSpanKind(spanKind int) StartOption {
return func(o *StartOptions) {
o.SpanKind = spanKind
}
}
// WithSampler makes new spans to be be created with a custom sampler.
// Otherwise, the global sampler is used.
func WithSampler(sampler Sampler) StartOption {
return func(o *StartOptions) {
o.Sampler = sampler
}
}
// StartSpan starts a new child span of the current span in the context. If
// there is no span in the context, creates a new trace and span.
//
// Returned context contains the newly created span. You can use it to
// propagate the returned span in process.
func StartSpan(ctx context.Context, name string, o ...StartOption) (context.Context, *Span) {
var opts StartOptions
var parent SpanContext
if p := FromContext(ctx); p != nil {
p.addChild()
parent = p.spanContext
}
for _, op := range o {
op(&opts)
}
span := startSpanInternal(name, parent != SpanContext{}, parent, false, opts)
ctx, end := startExecutionTracerTask(ctx, name)
span.executionTracerTaskEnd = end
return NewContext(ctx, span), span
}
// StartSpanWithRemoteParent starts a new child span of the span from the given parent.
//
// If the incoming context contains a parent, it ignores. StartSpanWithRemoteParent is
// preferred for cases where the parent is propagated via an incoming request.
//
// Returned context contains the newly created span. You can use it to
// propagate the returned span in process.
func StartSpanWithRemoteParent(ctx context.Context, name string, parent SpanContext, o ...StartOption) (context.Context, *Span) {
var opts StartOptions
for _, op := range o {
op(&opts)
}
span := startSpanInternal(name, parent != SpanContext{}, parent, true, opts)
ctx, end := startExecutionTracerTask(ctx, name)
span.executionTracerTaskEnd = end
return NewContext(ctx, span), span
}
func startSpanInternal(name string, hasParent bool, parent SpanContext, remoteParent bool, o StartOptions) *Span {
span := &Span{}
span.spanContext = parent
cfg := config.Load().(*Config)
if !hasParent {
span.spanContext.TraceID = cfg.IDGenerator.NewTraceID()
}
span.spanContext.SpanID = cfg.IDGenerator.NewSpanID()
sampler := cfg.DefaultSampler
if !hasParent || remoteParent || o.Sampler != nil {
// If this span is the child of a local span and no Sampler is set in the
// options, keep the parent's TraceOptions.
//
// Otherwise, consult the Sampler in the options if it is non-nil, otherwise
// the default sampler.
if o.Sampler != nil {
sampler = o.Sampler
}
span.spanContext.setIsSampled(sampler(SamplingParameters{
ParentContext: parent,
TraceID: span.spanContext.TraceID,
SpanID: span.spanContext.SpanID,
Name: name,
HasRemoteParent: remoteParent}).Sample)
}
if !internal.LocalSpanStoreEnabled && !span.spanContext.IsSampled() {
return span
}
span.data = &SpanData{
SpanContext: span.spanContext,
StartTime: time.Now(),
SpanKind: o.SpanKind,
Name: name,
HasRemoteParent: remoteParent,
}
span.lruAttributes = newLruMap(cfg.MaxAttributesPerSpan)
span.annotations = newEvictedQueue(cfg.MaxAnnotationEventsPerSpan)
span.messageEvents = newEvictedQueue(cfg.MaxMessageEventsPerSpan)
span.links = newEvictedQueue(cfg.MaxLinksPerSpan)
if hasParent {
span.data.ParentSpanID = parent.SpanID
}
if internal.LocalSpanStoreEnabled {
var ss *spanStore
ss = spanStoreForNameCreateIfNew(name)
if ss != nil {
span.spanStore = ss
ss.add(span)
}
}
return span
}
// End ends the span.
func (s *Span) End() {
if s == nil {
return
}
if s.executionTracerTaskEnd != nil {
s.executionTracerTaskEnd()
}
if !s.IsRecordingEvents() {
return
}
s.endOnce.Do(func() {
exp, _ := exporters.Load().(exportersMap)
mustExport := s.spanContext.IsSampled() && len(exp) > 0
if s.spanStore != nil || mustExport {
sd := s.makeSpanData()
sd.EndTime = internal.MonotonicEndTime(sd.StartTime)
if s.spanStore != nil {
s.spanStore.finished(s, sd)
}
if mustExport {
for e := range exp {
e.ExportSpan(sd)
}
}
}
})
}
// makeSpanData produces a SpanData representing the current state of the Span.
// It requires that s.data is non-nil.
func (s *Span) makeSpanData() *SpanData {
var sd SpanData
s.mu.Lock()
sd = *s.data
if s.lruAttributes.simpleLruMap.Len() > 0 {
sd.Attributes = s.lruAttributesToAttributeMap()
sd.DroppedAttributeCount = s.lruAttributes.droppedCount
}
if len(s.annotations.queue) > 0 {
sd.Annotations = s.interfaceArrayToAnnotationArray()
sd.DroppedAnnotationCount = s.annotations.droppedCount
}
if len(s.messageEvents.queue) > 0 {
sd.MessageEvents = s.interfaceArrayToMessageEventArray()
sd.DroppedMessageEventCount = s.messageEvents.droppedCount
}
if len(s.links.queue) > 0 {
sd.Links = s.interfaceArrayToLinksArray()
sd.DroppedLinkCount = s.links.droppedCount
}
s.mu.Unlock()
return &sd
}
// SpanContext returns the SpanContext of the span.
func (s *Span) SpanContext() SpanContext {
if s == nil {
return SpanContext{}
}
return s.spanContext
}
// SetName sets the name of the span, if it is recording events.
func (s *Span) SetName(name string) {
if !s.IsRecordingEvents() {
return
}
s.mu.Lock()
s.data.Name = name
s.mu.Unlock()
}
// SetStatus sets the status of the span, if it is recording events.
func (s *Span) SetStatus(status Status) {
if !s.IsRecordingEvents() {
return
}
s.mu.Lock()
s.data.Status = status
s.mu.Unlock()
}
func (s *Span) interfaceArrayToLinksArray() []Link {
linksArr := make([]Link, 0)
for _, value := range s.links.queue {
linksArr = append(linksArr, value.(Link))
}
return linksArr
}
func (s *Span) interfaceArrayToMessageEventArray() []MessageEvent {
messageEventArr := make([]MessageEvent, 0)
for _, value := range s.messageEvents.queue {
messageEventArr = append(messageEventArr, value.(MessageEvent))
}
return messageEventArr
}
func (s *Span) interfaceArrayToAnnotationArray() []Annotation {
annotationArr := make([]Annotation, 0)
for _, value := range s.annotations.queue {
annotationArr = append(annotationArr, value.(Annotation))
}
return annotationArr
}
func (s *Span) lruAttributesToAttributeMap() map[string]interface{} {
attributes := make(map[string]interface{})
for _, key := range s.lruAttributes.simpleLruMap.Keys() {
value, ok := s.lruAttributes.simpleLruMap.Get(key)
if ok {
keyStr := key.(string)
attributes[keyStr] = value
}
}
return attributes
}
func (s *Span) copyToCappedAttributes(attributes []Attribute) {
for _, a := range attributes {
s.lruAttributes.add(a.key, a.value)
}
}
func (s *Span) addChild() {
if !s.IsRecordingEvents() {
return
}
s.mu.Lock()
s.data.ChildSpanCount++
s.mu.Unlock()
}
// AddAttributes sets attributes in the span.
//
// Existing attributes whose keys appear in the attributes parameter are overwritten.
func (s *Span) AddAttributes(attributes ...Attribute) {
if !s.IsRecordingEvents() {
return
}
s.mu.Lock()
s.copyToCappedAttributes(attributes)
s.mu.Unlock()
}
// copyAttributes copies a slice of Attributes into a map.
func copyAttributes(m map[string]interface{}, attributes []Attribute) {
for _, a := range attributes {
m[a.key] = a.value
}
}
func (s *Span) lazyPrintfInternal(attributes []Attribute, format string, a ...interface{}) {
now := time.Now()
msg := fmt.Sprintf(format, a...)
var m map[string]interface{}
s.mu.Lock()
if len(attributes) != 0 {
m = make(map[string]interface{})
copyAttributes(m, attributes)
}
s.annotations.add(Annotation{
Time: now,
Message: msg,
Attributes: m,
})
s.mu.Unlock()
}
func (s *Span) printStringInternal(attributes []Attribute, str string) {
now := time.Now()
var a map[string]interface{}
s.mu.Lock()
if len(attributes) != 0 {
a = make(map[string]interface{})
copyAttributes(a, attributes)
}
s.annotations.add(Annotation{
Time: now,
Message: str,
Attributes: a,
})
s.mu.Unlock()
}
// Annotate adds an annotation with attributes.
// Attributes can be nil.
func (s *Span) Annotate(attributes []Attribute, str string) {
if !s.IsRecordingEvents() {
return
}
s.printStringInternal(attributes, str)
}
// Annotatef adds an annotation with attributes.
func (s *Span) Annotatef(attributes []Attribute, format string, a ...interface{}) {
if !s.IsRecordingEvents() {
return
}
s.lazyPrintfInternal(attributes, format, a...)
}
// AddMessageSendEvent adds a message send event to the span.
//
// messageID is an identifier for the message, which is recommended to be
// unique in this span and the same between the send event and the receive
// event (this allows to identify a message between the sender and receiver).
// For example, this could be a sequence id.
func (s *Span) AddMessageSendEvent(messageID, uncompressedByteSize, compressedByteSize int64) {
if !s.IsRecordingEvents() {
return
}
now := time.Now()
s.mu.Lock()
s.messageEvents.add(MessageEvent{
Time: now,
EventType: MessageEventTypeSent,
MessageID: messageID,
UncompressedByteSize: uncompressedByteSize,
CompressedByteSize: compressedByteSize,
})
s.mu.Unlock()
}
// AddMessageReceiveEvent adds a message receive event to the span.
//
// messageID is an identifier for the message, which is recommended to be
// unique in this span and the same between the send event and the receive
// event (this allows to identify a message between the sender and receiver).
// For example, this could be a sequence id.
func (s *Span) AddMessageReceiveEvent(messageID, uncompressedByteSize, compressedByteSize int64) {
if !s.IsRecordingEvents() {
return
}
now := time.Now()
s.mu.Lock()
s.messageEvents.add(MessageEvent{
Time: now,
EventType: MessageEventTypeRecv,
MessageID: messageID,
UncompressedByteSize: uncompressedByteSize,
CompressedByteSize: compressedByteSize,
})
s.mu.Unlock()
}
// AddLink adds a link to the span.
func (s *Span) AddLink(l Link) {
if !s.IsRecordingEvents() {
return
}
s.mu.Lock()
s.links.add(l)
s.mu.Unlock()
}
func (s *Span) String() string {
if s == nil {
return "<nil>"
}
if s.data == nil {
return fmt.Sprintf("span %s", s.spanContext.SpanID)
}
s.mu.Lock()
str := fmt.Sprintf("span %s %q", s.spanContext.SpanID, s.data.Name)
s.mu.Unlock()
return str
}
var config atomic.Value // access atomically
func init() {
gen := &defaultIDGenerator{}
// initialize traceID and spanID generators.
var rngSeed int64
for _, p := range []interface{}{
&rngSeed, &gen.traceIDAdd, &gen.nextSpanID, &gen.spanIDInc,
} {
binary.Read(crand.Reader, binary.LittleEndian, p)
}
gen.traceIDRand = rand.New(rand.NewSource(rngSeed))
gen.spanIDInc |= 1
config.Store(&Config{
DefaultSampler: ProbabilitySampler(defaultSamplingProbability),
IDGenerator: gen,
MaxAttributesPerSpan: DefaultMaxAttributesPerSpan,
MaxAnnotationEventsPerSpan: DefaultMaxAnnotationEventsPerSpan,
MaxMessageEventsPerSpan: DefaultMaxMessageEventsPerSpan,
MaxLinksPerSpan: DefaultMaxLinksPerSpan,
})
}
type defaultIDGenerator struct {
sync.Mutex
// Please keep these as the first fields
// so that these 8 byte fields will be aligned on addresses
// divisible by 8, on both 32-bit and 64-bit machines when
// performing atomic increments and accesses.
// See:
// * https://github.com/census-instrumentation/opencensus-go/issues/587
// * https://github.com/census-instrumentation/opencensus-go/issues/865
// * https://golang.org/pkg/sync/atomic/#pkg-note-BUG
nextSpanID uint64
spanIDInc uint64
traceIDAdd [2]uint64
traceIDRand *rand.Rand
}
// NewSpanID returns a non-zero span ID from a randomly-chosen sequence.
func (gen *defaultIDGenerator) NewSpanID() [8]byte {
var id uint64
for id == 0 {
id = atomic.AddUint64(&gen.nextSpanID, gen.spanIDInc)
}
var sid [8]byte
binary.LittleEndian.PutUint64(sid[:], id)
return sid
}
// NewTraceID returns a non-zero trace ID from a randomly-chosen sequence.
// mu should be held while this function is called.
func (gen *defaultIDGenerator) NewTraceID() [16]byte {
var tid [16]byte
// Construct the trace ID from two outputs of traceIDRand, with a constant
// added to each half for additional entropy.
gen.Lock()
binary.LittleEndian.PutUint64(tid[0:8], gen.traceIDRand.Uint64()+gen.traceIDAdd[0])
binary.LittleEndian.PutUint64(tid[8:16], gen.traceIDRand.Uint64()+gen.traceIDAdd[1])
gen.Unlock()
return tid
}

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vendor/go.opencensus.io/trace/trace_go11.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build go1.11
package trace
import (
"context"
t "runtime/trace"
)
func startExecutionTracerTask(ctx context.Context, name string) (context.Context, func()) {
if !t.IsEnabled() {
// Avoid additional overhead if
// runtime/trace is not enabled.
return ctx, func() {}
}
nctx, task := t.NewTask(ctx, name)
return nctx, task.End
}

25
vendor/go.opencensus.io/trace/trace_nongo11.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !go1.11
package trace
import (
"context"
)
func startExecutionTracerTask(ctx context.Context, name string) (context.Context, func()) {
return ctx, func() {}
}

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vendor/go.opencensus.io/trace/tracestate/tracestate.go generated vendored Normal file
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package tracestate implements support for the Tracestate header of the
// W3C TraceContext propagation format.
package tracestate
import (
"fmt"
"regexp"
)
const (
keyMaxSize = 256
valueMaxSize = 256
maxKeyValuePairs = 32
)
const (
keyWithoutVendorFormat = `[a-z][_0-9a-z\-\*\/]{0,255}`
keyWithVendorFormat = `[a-z][_0-9a-z\-\*\/]{0,240}@[a-z][_0-9a-z\-\*\/]{0,13}`
keyFormat = `(` + keyWithoutVendorFormat + `)|(` + keyWithVendorFormat + `)`
valueFormat = `[\x20-\x2b\x2d-\x3c\x3e-\x7e]{0,255}[\x21-\x2b\x2d-\x3c\x3e-\x7e]`
)
var keyValidationRegExp = regexp.MustCompile(`^(` + keyFormat + `)$`)
var valueValidationRegExp = regexp.MustCompile(`^(` + valueFormat + `)$`)
// Tracestate represents tracing-system specific context in a list of key-value pairs. Tracestate allows different
// vendors propagate additional information and inter-operate with their legacy Id formats.
type Tracestate struct {
entries []Entry
}
// Entry represents one key-value pair in a list of key-value pair of Tracestate.
type Entry struct {
// Key is an opaque string up to 256 characters printable. It MUST begin with a lowercase letter,
// and can only contain lowercase letters a-z, digits 0-9, underscores _, dashes -, asterisks *, and
// forward slashes /.
Key string
// Value is an opaque string up to 256 characters printable ASCII RFC0020 characters (i.e., the
// range 0x20 to 0x7E) except comma , and =.
Value string
}
// Entries returns a slice of Entry.
func (ts *Tracestate) Entries() []Entry {
if ts == nil {
return nil
}
return ts.entries
}
func (ts *Tracestate) remove(key string) *Entry {
for index, entry := range ts.entries {
if entry.Key == key {
ts.entries = append(ts.entries[:index], ts.entries[index+1:]...)
return &entry
}
}
return nil
}
func (ts *Tracestate) add(entries []Entry) error {
for _, entry := range entries {
ts.remove(entry.Key)
}
if len(ts.entries)+len(entries) > maxKeyValuePairs {
return fmt.Errorf("adding %d key-value pairs to current %d pairs exceeds the limit of %d",
len(entries), len(ts.entries), maxKeyValuePairs)
}
ts.entries = append(entries, ts.entries...)
return nil
}
func isValid(entry Entry) bool {
return keyValidationRegExp.MatchString(entry.Key) &&
valueValidationRegExp.MatchString(entry.Value)
}
func containsDuplicateKey(entries ...Entry) (string, bool) {
keyMap := make(map[string]int)
for _, entry := range entries {
if _, ok := keyMap[entry.Key]; ok {
return entry.Key, true
}
keyMap[entry.Key] = 1
}
return "", false
}
func areEntriesValid(entries ...Entry) (*Entry, bool) {
for _, entry := range entries {
if !isValid(entry) {
return &entry, false
}
}
return nil, true
}
// New creates a Tracestate object from a parent and/or entries (key-value pair).
// Entries from the parent are copied if present. The entries passed to this function
// are inserted in front of those copied from the parent. If an entry copied from the
// parent contains the same key as one of the entry in entries then the entry copied
// from the parent is removed. See add func.
//
// An error is returned with nil Tracestate if
// 1. one or more entry in entries is invalid.
// 2. two or more entries in the input entries have the same key.
// 3. the number of entries combined from the parent and the input entries exceeds maxKeyValuePairs.
// (duplicate entry is counted only once).
func New(parent *Tracestate, entries ...Entry) (*Tracestate, error) {
if parent == nil && len(entries) == 0 {
return nil, nil
}
if entry, ok := areEntriesValid(entries...); !ok {
return nil, fmt.Errorf("key-value pair {%s, %s} is invalid", entry.Key, entry.Value)
}
if key, duplicate := containsDuplicateKey(entries...); duplicate {
return nil, fmt.Errorf("contains duplicate keys (%s)", key)
}
tracestate := Tracestate{}
if parent != nil && len(parent.entries) > 0 {
tracestate.entries = append([]Entry{}, parent.entries...)
}
err := tracestate.add(entries)
if err != nil {
return nil, err
}
return &tracestate, nil
}

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vendor/golang.org/x/oauth2/google/appengine.go generated vendored Normal file
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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package google
import (
"context"
"time"
"golang.org/x/oauth2"
)
// Set at init time by appengine_gen1.go. If nil, we're not on App Engine standard first generation (<= Go 1.9) or App Engine flexible.
var appengineTokenFunc func(c context.Context, scopes ...string) (token string, expiry time.Time, err error)
// Set at init time by appengine_gen1.go. If nil, we're not on App Engine standard first generation (<= Go 1.9) or App Engine flexible.
var appengineAppIDFunc func(c context.Context) string
// AppEngineTokenSource returns a token source that fetches tokens from either
// the current application's service account or from the metadata server,
// depending on the App Engine environment. See below for environment-specific
// details. If you are implementing a 3-legged OAuth 2.0 flow on App Engine that
// involves user accounts, see oauth2.Config instead.
//
// First generation App Engine runtimes (<= Go 1.9):
// AppEngineTokenSource returns a token source that fetches tokens issued to the
// current App Engine application's service account. The provided context must have
// come from appengine.NewContext.
//
// Second generation App Engine runtimes (>= Go 1.11) and App Engine flexible:
// AppEngineTokenSource is DEPRECATED on second generation runtimes and on the
// flexible environment. It delegates to ComputeTokenSource, and the provided
// context and scopes are not used. Please use DefaultTokenSource (or ComputeTokenSource,
// which DefaultTokenSource will use in this case) instead.
func AppEngineTokenSource(ctx context.Context, scope ...string) oauth2.TokenSource {
return appEngineTokenSource(ctx, scope...)
}

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vendor/golang.org/x/oauth2/google/appengine_gen1.go generated vendored Normal file
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build appengine
// This file applies to App Engine first generation runtimes (<= Go 1.9).
package google
import (
"context"
"sort"
"strings"
"sync"
"golang.org/x/oauth2"
"google.golang.org/appengine"
)
func init() {
appengineTokenFunc = appengine.AccessToken
appengineAppIDFunc = appengine.AppID
}
// See comment on AppEngineTokenSource in appengine.go.
func appEngineTokenSource(ctx context.Context, scope ...string) oauth2.TokenSource {
scopes := append([]string{}, scope...)
sort.Strings(scopes)
return &gaeTokenSource{
ctx: ctx,
scopes: scopes,
key: strings.Join(scopes, " "),
}
}
// aeTokens helps the fetched tokens to be reused until their expiration.
var (
aeTokensMu sync.Mutex
aeTokens = make(map[string]*tokenLock) // key is space-separated scopes
)
type tokenLock struct {
mu sync.Mutex // guards t; held while fetching or updating t
t *oauth2.Token
}
type gaeTokenSource struct {
ctx context.Context
scopes []string
key string // to aeTokens map; space-separated scopes
}
func (ts *gaeTokenSource) Token() (*oauth2.Token, error) {
aeTokensMu.Lock()
tok, ok := aeTokens[ts.key]
if !ok {
tok = &tokenLock{}
aeTokens[ts.key] = tok
}
aeTokensMu.Unlock()
tok.mu.Lock()
defer tok.mu.Unlock()
if tok.t.Valid() {
return tok.t, nil
}
access, exp, err := appengineTokenFunc(ts.ctx, ts.scopes...)
if err != nil {
return nil, err
}
tok.t = &oauth2.Token{
AccessToken: access,
Expiry: exp,
}
return tok.t, nil
}

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vendor/golang.org/x/oauth2/google/appengine_gen2_flex.go generated vendored Normal file
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build !appengine
// This file applies to App Engine second generation runtimes (>= Go 1.11) and App Engine flexible.
package google
import (
"context"
"log"
"sync"
"golang.org/x/oauth2"
)
var logOnce sync.Once // only spam about deprecation once
// See comment on AppEngineTokenSource in appengine.go.
func appEngineTokenSource(ctx context.Context, scope ...string) oauth2.TokenSource {
logOnce.Do(func() {
log.Print("google: AppEngineTokenSource is deprecated on App Engine standard second generation runtimes (>= Go 1.11) and App Engine flexible. Please use DefaultTokenSource or ComputeTokenSource.")
})
return ComputeTokenSource("")
}

154
vendor/golang.org/x/oauth2/google/default.go generated vendored Normal file
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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package google
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"runtime"
"cloud.google.com/go/compute/metadata"
"golang.org/x/oauth2"
)
// Credentials holds Google credentials, including "Application Default Credentials".
// For more details, see:
// https://developers.google.com/accounts/docs/application-default-credentials
type Credentials struct {
ProjectID string // may be empty
TokenSource oauth2.TokenSource
// JSON contains the raw bytes from a JSON credentials file.
// This field may be nil if authentication is provided by the
// environment and not with a credentials file, e.g. when code is
// running on Google Cloud Platform.
JSON []byte
}
// DefaultCredentials is the old name of Credentials.
//
// Deprecated: use Credentials instead.
type DefaultCredentials = Credentials
// DefaultClient returns an HTTP Client that uses the
// DefaultTokenSource to obtain authentication credentials.
func DefaultClient(ctx context.Context, scope ...string) (*http.Client, error) {
ts, err := DefaultTokenSource(ctx, scope...)
if err != nil {
return nil, err
}
return oauth2.NewClient(ctx, ts), nil
}
// DefaultTokenSource returns the token source for
// "Application Default Credentials".
// It is a shortcut for FindDefaultCredentials(ctx, scope).TokenSource.
func DefaultTokenSource(ctx context.Context, scope ...string) (oauth2.TokenSource, error) {
creds, err := FindDefaultCredentials(ctx, scope...)
if err != nil {
return nil, err
}
return creds.TokenSource, nil
}
// FindDefaultCredentials searches for "Application Default Credentials".
//
// It looks for credentials in the following places,
// preferring the first location found:
//
// 1. A JSON file whose path is specified by the
// GOOGLE_APPLICATION_CREDENTIALS environment variable.
// 2. A JSON file in a location known to the gcloud command-line tool.
// On Windows, this is %APPDATA%/gcloud/application_default_credentials.json.
// On other systems, $HOME/.config/gcloud/application_default_credentials.json.
// 3. On Google App Engine standard first generation runtimes (<= Go 1.9) it uses
// the appengine.AccessToken function.
// 4. On Google Compute Engine, Google App Engine standard second generation runtimes
// (>= Go 1.11), and Google App Engine flexible environment, it fetches
// credentials from the metadata server.
func FindDefaultCredentials(ctx context.Context, scopes ...string) (*Credentials, error) {
// First, try the environment variable.
const envVar = "GOOGLE_APPLICATION_CREDENTIALS"
if filename := os.Getenv(envVar); filename != "" {
creds, err := readCredentialsFile(ctx, filename, scopes)
if err != nil {
return nil, fmt.Errorf("google: error getting credentials using %v environment variable: %v", envVar, err)
}
return creds, nil
}
// Second, try a well-known file.
filename := wellKnownFile()
if creds, err := readCredentialsFile(ctx, filename, scopes); err == nil {
return creds, nil
} else if !os.IsNotExist(err) {
return nil, fmt.Errorf("google: error getting credentials using well-known file (%v): %v", filename, err)
}
// Third, if we're on a Google App Engine standard first generation runtime (<= Go 1.9)
// use those credentials. App Engine standard second generation runtimes (>= Go 1.11)
// and App Engine flexible use ComputeTokenSource and the metadata server.
if appengineTokenFunc != nil {
return &DefaultCredentials{
ProjectID: appengineAppIDFunc(ctx),
TokenSource: AppEngineTokenSource(ctx, scopes...),
}, nil
}
// Fourth, if we're on Google Compute Engine, an App Engine standard second generation runtime,
// or App Engine flexible, use the metadata server.
if metadata.OnGCE() {
id, _ := metadata.ProjectID()
return &DefaultCredentials{
ProjectID: id,
TokenSource: ComputeTokenSource("", scopes...),
}, nil
}
// None are found; return helpful error.
const url = "https://developers.google.com/accounts/docs/application-default-credentials"
return nil, fmt.Errorf("google: could not find default credentials. See %v for more information.", url)
}
// CredentialsFromJSON obtains Google credentials from a JSON value. The JSON can
// represent either a Google Developers Console client_credentials.json file (as in
// ConfigFromJSON) or a Google Developers service account key file (as in
// JWTConfigFromJSON).
func CredentialsFromJSON(ctx context.Context, jsonData []byte, scopes ...string) (*Credentials, error) {
var f credentialsFile
if err := json.Unmarshal(jsonData, &f); err != nil {
return nil, err
}
ts, err := f.tokenSource(ctx, append([]string(nil), scopes...))
if err != nil {
return nil, err
}
return &DefaultCredentials{
ProjectID: f.ProjectID,
TokenSource: ts,
JSON: jsonData,
}, nil
}
func wellKnownFile() string {
const f = "application_default_credentials.json"
if runtime.GOOS == "windows" {
return filepath.Join(os.Getenv("APPDATA"), "gcloud", f)
}
return filepath.Join(guessUnixHomeDir(), ".config", "gcloud", f)
}
func readCredentialsFile(ctx context.Context, filename string, scopes []string) (*DefaultCredentials, error) {
b, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
return CredentialsFromJSON(ctx, b, scopes...)
}

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vendor/golang.org/x/oauth2/google/doc.go generated vendored Normal file
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package google provides support for making OAuth2 authorized and authenticated
// HTTP requests to Google APIs. It supports the Web server flow, client-side
// credentials, service accounts, Google Compute Engine service accounts, and Google
// App Engine service accounts.
//
// A brief overview of the package follows. For more information, please read
// https://developers.google.com/accounts/docs/OAuth2
// and
// https://developers.google.com/accounts/docs/application-default-credentials.
//
// OAuth2 Configs
//
// Two functions in this package return golang.org/x/oauth2.Config values from Google credential
// data. Google supports two JSON formats for OAuth2 credentials: one is handled by ConfigFromJSON,
// the other by JWTConfigFromJSON. The returned Config can be used to obtain a TokenSource or
// create an http.Client.
//
//
// Credentials
//
// The Credentials type represents Google credentials, including Application Default
// Credentials.
//
// Use FindDefaultCredentials to obtain Application Default Credentials.
// FindDefaultCredentials looks in some well-known places for a credentials file, and
// will call AppEngineTokenSource or ComputeTokenSource as needed.
//
// DefaultClient and DefaultTokenSource are convenience methods. They first call FindDefaultCredentials,
// then use the credentials to construct an http.Client or an oauth2.TokenSource.
//
// Use CredentialsFromJSON to obtain credentials from either of the two JSON formats
// described in OAuth2 Configs, above. The TokenSource in the returned value is the
// same as the one obtained from the oauth2.Config returned from ConfigFromJSON or
// JWTConfigFromJSON, but the Credentials may contain additional information
// that is useful is some circumstances.
package google // import "golang.org/x/oauth2/google"

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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package google
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/url"
"strings"
"time"
"cloud.google.com/go/compute/metadata"
"golang.org/x/oauth2"
"golang.org/x/oauth2/jwt"
)
// Endpoint is Google's OAuth 2.0 endpoint.
var Endpoint = oauth2.Endpoint{
AuthURL: "https://accounts.google.com/o/oauth2/auth",
TokenURL: "https://oauth2.googleapis.com/token",
AuthStyle: oauth2.AuthStyleInParams,
}
// JWTTokenURL is Google's OAuth 2.0 token URL to use with the JWT flow.
const JWTTokenURL = "https://oauth2.googleapis.com/token"
// ConfigFromJSON uses a Google Developers Console client_credentials.json
// file to construct a config.
// client_credentials.json can be downloaded from
// https://console.developers.google.com, under "Credentials". Download the Web
// application credentials in the JSON format and provide the contents of the
// file as jsonKey.
func ConfigFromJSON(jsonKey []byte, scope ...string) (*oauth2.Config, error) {
type cred struct {
ClientID string `json:"client_id"`
ClientSecret string `json:"client_secret"`
RedirectURIs []string `json:"redirect_uris"`
AuthURI string `json:"auth_uri"`
TokenURI string `json:"token_uri"`
}
var j struct {
Web *cred `json:"web"`
Installed *cred `json:"installed"`
}
if err := json.Unmarshal(jsonKey, &j); err != nil {
return nil, err
}
var c *cred
switch {
case j.Web != nil:
c = j.Web
case j.Installed != nil:
c = j.Installed
default:
return nil, fmt.Errorf("oauth2/google: no credentials found")
}
if len(c.RedirectURIs) < 1 {
return nil, errors.New("oauth2/google: missing redirect URL in the client_credentials.json")
}
return &oauth2.Config{
ClientID: c.ClientID,
ClientSecret: c.ClientSecret,
RedirectURL: c.RedirectURIs[0],
Scopes: scope,
Endpoint: oauth2.Endpoint{
AuthURL: c.AuthURI,
TokenURL: c.TokenURI,
},
}, nil
}
// JWTConfigFromJSON uses a Google Developers service account JSON key file to read
// the credentials that authorize and authenticate the requests.
// Create a service account on "Credentials" for your project at
// https://console.developers.google.com to download a JSON key file.
func JWTConfigFromJSON(jsonKey []byte, scope ...string) (*jwt.Config, error) {
var f credentialsFile
if err := json.Unmarshal(jsonKey, &f); err != nil {
return nil, err
}
if f.Type != serviceAccountKey {
return nil, fmt.Errorf("google: read JWT from JSON credentials: 'type' field is %q (expected %q)", f.Type, serviceAccountKey)
}
scope = append([]string(nil), scope...) // copy
return f.jwtConfig(scope), nil
}
// JSON key file types.
const (
serviceAccountKey = "service_account"
userCredentialsKey = "authorized_user"
)
// credentialsFile is the unmarshalled representation of a credentials file.
type credentialsFile struct {
Type string `json:"type"` // serviceAccountKey or userCredentialsKey
// Service Account fields
ClientEmail string `json:"client_email"`
PrivateKeyID string `json:"private_key_id"`
PrivateKey string `json:"private_key"`
TokenURL string `json:"token_uri"`
ProjectID string `json:"project_id"`
// User Credential fields
// (These typically come from gcloud auth.)
ClientSecret string `json:"client_secret"`
ClientID string `json:"client_id"`
RefreshToken string `json:"refresh_token"`
}
func (f *credentialsFile) jwtConfig(scopes []string) *jwt.Config {
cfg := &jwt.Config{
Email: f.ClientEmail,
PrivateKey: []byte(f.PrivateKey),
PrivateKeyID: f.PrivateKeyID,
Scopes: scopes,
TokenURL: f.TokenURL,
}
if cfg.TokenURL == "" {
cfg.TokenURL = JWTTokenURL
}
return cfg
}
func (f *credentialsFile) tokenSource(ctx context.Context, scopes []string) (oauth2.TokenSource, error) {
switch f.Type {
case serviceAccountKey:
cfg := f.jwtConfig(scopes)
return cfg.TokenSource(ctx), nil
case userCredentialsKey:
cfg := &oauth2.Config{
ClientID: f.ClientID,
ClientSecret: f.ClientSecret,
Scopes: scopes,
Endpoint: Endpoint,
}
tok := &oauth2.Token{RefreshToken: f.RefreshToken}
return cfg.TokenSource(ctx, tok), nil
case "":
return nil, errors.New("missing 'type' field in credentials")
default:
return nil, fmt.Errorf("unknown credential type: %q", f.Type)
}
}
// ComputeTokenSource returns a token source that fetches access tokens
// from Google Compute Engine (GCE)'s metadata server. It's only valid to use
// this token source if your program is running on a GCE instance.
// If no account is specified, "default" is used.
// If no scopes are specified, a set of default scopes are automatically granted.
// Further information about retrieving access tokens from the GCE metadata
// server can be found at https://cloud.google.com/compute/docs/authentication.
func ComputeTokenSource(account string, scope ...string) oauth2.TokenSource {
return oauth2.ReuseTokenSource(nil, computeSource{account: account, scopes: scope})
}
type computeSource struct {
account string
scopes []string
}
func (cs computeSource) Token() (*oauth2.Token, error) {
if !metadata.OnGCE() {
return nil, errors.New("oauth2/google: can't get a token from the metadata service; not running on GCE")
}
acct := cs.account
if acct == "" {
acct = "default"
}
tokenURI := "instance/service-accounts/" + acct + "/token"
if len(cs.scopes) > 0 {
v := url.Values{}
v.Set("scopes", strings.Join(cs.scopes, ","))
tokenURI = tokenURI + "?" + v.Encode()
}
tokenJSON, err := metadata.Get(tokenURI)
if err != nil {
return nil, err
}
var res struct {
AccessToken string `json:"access_token"`
ExpiresInSec int `json:"expires_in"`
TokenType string `json:"token_type"`
}
err = json.NewDecoder(strings.NewReader(tokenJSON)).Decode(&res)
if err != nil {
return nil, fmt.Errorf("oauth2/google: invalid token JSON from metadata: %v", err)
}
if res.ExpiresInSec == 0 || res.AccessToken == "" {
return nil, fmt.Errorf("oauth2/google: incomplete token received from metadata")
}
tok := &oauth2.Token{
AccessToken: res.AccessToken,
TokenType: res.TokenType,
Expiry: time.Now().Add(time.Duration(res.ExpiresInSec) * time.Second),
}
// NOTE(cbro): add hidden metadata about where the token is from.
// This is needed for detection by client libraries to know that credentials come from the metadata server.
// This may be removed in a future version of this library.
return tok.WithExtra(map[string]interface{}{
"oauth2.google.tokenSource": "compute-metadata",
"oauth2.google.serviceAccount": acct,
}), nil
}

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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package google
import (
"crypto/rsa"
"fmt"
"time"
"golang.org/x/oauth2"
"golang.org/x/oauth2/internal"
"golang.org/x/oauth2/jws"
)
// JWTAccessTokenSourceFromJSON uses a Google Developers service account JSON
// key file to read the credentials that authorize and authenticate the
// requests, and returns a TokenSource that does not use any OAuth2 flow but
// instead creates a JWT and sends that as the access token.
// The audience is typically a URL that specifies the scope of the credentials.
//
// Note that this is not a standard OAuth flow, but rather an
// optimization supported by a few Google services.
// Unless you know otherwise, you should use JWTConfigFromJSON instead.
func JWTAccessTokenSourceFromJSON(jsonKey []byte, audience string) (oauth2.TokenSource, error) {
cfg, err := JWTConfigFromJSON(jsonKey)
if err != nil {
return nil, fmt.Errorf("google: could not parse JSON key: %v", err)
}
pk, err := internal.ParseKey(cfg.PrivateKey)
if err != nil {
return nil, fmt.Errorf("google: could not parse key: %v", err)
}
ts := &jwtAccessTokenSource{
email: cfg.Email,
audience: audience,
pk: pk,
pkID: cfg.PrivateKeyID,
}
tok, err := ts.Token()
if err != nil {
return nil, err
}
return oauth2.ReuseTokenSource(tok, ts), nil
}
type jwtAccessTokenSource struct {
email, audience string
pk *rsa.PrivateKey
pkID string
}
func (ts *jwtAccessTokenSource) Token() (*oauth2.Token, error) {
iat := time.Now()
exp := iat.Add(time.Hour)
cs := &jws.ClaimSet{
Iss: ts.email,
Sub: ts.email,
Aud: ts.audience,
Iat: iat.Unix(),
Exp: exp.Unix(),
}
hdr := &jws.Header{
Algorithm: "RS256",
Typ: "JWT",
KeyID: string(ts.pkID),
}
msg, err := jws.Encode(hdr, cs, ts.pk)
if err != nil {
return nil, fmt.Errorf("google: could not encode JWT: %v", err)
}
return &oauth2.Token{AccessToken: msg, TokenType: "Bearer", Expiry: exp}, nil
}

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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package google
import (
"bufio"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"os"
"os/user"
"path/filepath"
"runtime"
"strings"
"time"
"golang.org/x/oauth2"
)
type sdkCredentials struct {
Data []struct {
Credential struct {
ClientID string `json:"client_id"`
ClientSecret string `json:"client_secret"`
AccessToken string `json:"access_token"`
RefreshToken string `json:"refresh_token"`
TokenExpiry *time.Time `json:"token_expiry"`
} `json:"credential"`
Key struct {
Account string `json:"account"`
Scope string `json:"scope"`
} `json:"key"`
}
}
// An SDKConfig provides access to tokens from an account already
// authorized via the Google Cloud SDK.
type SDKConfig struct {
conf oauth2.Config
initialToken *oauth2.Token
}
// NewSDKConfig creates an SDKConfig for the given Google Cloud SDK
// account. If account is empty, the account currently active in
// Google Cloud SDK properties is used.
// Google Cloud SDK credentials must be created by running `gcloud auth`
// before using this function.
// The Google Cloud SDK is available at https://cloud.google.com/sdk/.
func NewSDKConfig(account string) (*SDKConfig, error) {
configPath, err := sdkConfigPath()
if err != nil {
return nil, fmt.Errorf("oauth2/google: error getting SDK config path: %v", err)
}
credentialsPath := filepath.Join(configPath, "credentials")
f, err := os.Open(credentialsPath)
if err != nil {
return nil, fmt.Errorf("oauth2/google: failed to load SDK credentials: %v", err)
}
defer f.Close()
var c sdkCredentials
if err := json.NewDecoder(f).Decode(&c); err != nil {
return nil, fmt.Errorf("oauth2/google: failed to decode SDK credentials from %q: %v", credentialsPath, err)
}
if len(c.Data) == 0 {
return nil, fmt.Errorf("oauth2/google: no credentials found in %q, run `gcloud auth login` to create one", credentialsPath)
}
if account == "" {
propertiesPath := filepath.Join(configPath, "properties")
f, err := os.Open(propertiesPath)
if err != nil {
return nil, fmt.Errorf("oauth2/google: failed to load SDK properties: %v", err)
}
defer f.Close()
ini, err := parseINI(f)
if err != nil {
return nil, fmt.Errorf("oauth2/google: failed to parse SDK properties %q: %v", propertiesPath, err)
}
core, ok := ini["core"]
if !ok {
return nil, fmt.Errorf("oauth2/google: failed to find [core] section in %v", ini)
}
active, ok := core["account"]
if !ok {
return nil, fmt.Errorf("oauth2/google: failed to find %q attribute in %v", "account", core)
}
account = active
}
for _, d := range c.Data {
if account == "" || d.Key.Account == account {
if d.Credential.AccessToken == "" && d.Credential.RefreshToken == "" {
return nil, fmt.Errorf("oauth2/google: no token available for account %q", account)
}
var expiry time.Time
if d.Credential.TokenExpiry != nil {
expiry = *d.Credential.TokenExpiry
}
return &SDKConfig{
conf: oauth2.Config{
ClientID: d.Credential.ClientID,
ClientSecret: d.Credential.ClientSecret,
Scopes: strings.Split(d.Key.Scope, " "),
Endpoint: Endpoint,
RedirectURL: "oob",
},
initialToken: &oauth2.Token{
AccessToken: d.Credential.AccessToken,
RefreshToken: d.Credential.RefreshToken,
Expiry: expiry,
},
}, nil
}
}
return nil, fmt.Errorf("oauth2/google: no such credentials for account %q", account)
}
// Client returns an HTTP client using Google Cloud SDK credentials to
// authorize requests. The token will auto-refresh as necessary. The
// underlying http.RoundTripper will be obtained using the provided
// context. The returned client and its Transport should not be
// modified.
func (c *SDKConfig) Client(ctx context.Context) *http.Client {
return &http.Client{
Transport: &oauth2.Transport{
Source: c.TokenSource(ctx),
},
}
}
// TokenSource returns an oauth2.TokenSource that retrieve tokens from
// Google Cloud SDK credentials using the provided context.
// It will returns the current access token stored in the credentials,
// and refresh it when it expires, but it won't update the credentials
// with the new access token.
func (c *SDKConfig) TokenSource(ctx context.Context) oauth2.TokenSource {
return c.conf.TokenSource(ctx, c.initialToken)
}
// Scopes are the OAuth 2.0 scopes the current account is authorized for.
func (c *SDKConfig) Scopes() []string {
return c.conf.Scopes
}
func parseINI(ini io.Reader) (map[string]map[string]string, error) {
result := map[string]map[string]string{
"": {}, // root section
}
scanner := bufio.NewScanner(ini)
currentSection := ""
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if strings.HasPrefix(line, ";") {
// comment.
continue
}
if strings.HasPrefix(line, "[") && strings.HasSuffix(line, "]") {
currentSection = strings.TrimSpace(line[1 : len(line)-1])
result[currentSection] = map[string]string{}
continue
}
parts := strings.SplitN(line, "=", 2)
if len(parts) == 2 && parts[0] != "" {
result[currentSection][strings.TrimSpace(parts[0])] = strings.TrimSpace(parts[1])
}
}
if err := scanner.Err(); err != nil {
return nil, fmt.Errorf("error scanning ini: %v", err)
}
return result, nil
}
// sdkConfigPath tries to guess where the gcloud config is located.
// It can be overridden during tests.
var sdkConfigPath = func() (string, error) {
if runtime.GOOS == "windows" {
return filepath.Join(os.Getenv("APPDATA"), "gcloud"), nil
}
homeDir := guessUnixHomeDir()
if homeDir == "" {
return "", errors.New("unable to get current user home directory: os/user lookup failed; $HOME is empty")
}
return filepath.Join(homeDir, ".config", "gcloud"), nil
}
func guessUnixHomeDir() string {
// Prefer $HOME over user.Current due to glibc bug: golang.org/issue/13470
if v := os.Getenv("HOME"); v != "" {
return v
}
// Else, fall back to user.Current:
if u, err := user.Current(); err == nil {
return u.HomeDir
}
return ""
}

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