74 lines
2.5 KiB
Go
74 lines
2.5 KiB
Go
// Copyright 2018 The Go Cloud Development Kit Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package sdserver provides the diagnostic hooks for a server using
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// Stackdriver.
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package sdserver // import "gocloud.dev/server/sdserver"
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import (
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"fmt"
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"os"
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"github.com/google/wire"
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"gocloud.dev/gcp"
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"gocloud.dev/internal/useragent"
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"gocloud.dev/server"
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"gocloud.dev/server/requestlog"
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"contrib.go.opencensus.io/exporter/stackdriver"
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"contrib.go.opencensus.io/exporter/stackdriver/monitoredresource"
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"go.opencensus.io/trace"
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"golang.org/x/oauth2"
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"google.golang.org/api/option"
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)
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// Set is a Wire provider set that provides the diagnostic hooks for
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// *server.Server given a GCP token source and a GCP project ID.
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var Set = wire.NewSet(
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server.Set,
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NewExporter,
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monitoredresource.Autodetect,
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wire.Bind(new(trace.Exporter), new(*stackdriver.Exporter)),
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NewRequestLogger,
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wire.Bind(new(requestlog.Logger), new(*requestlog.StackdriverLogger)),
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)
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// NewExporter returns a new OpenCensus Stackdriver exporter.
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//
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// The second return value is a Wire cleanup function that calls Flush
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// on the exporter.
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func NewExporter(id gcp.ProjectID, ts gcp.TokenSource, mr monitoredresource.Interface) (*stackdriver.Exporter, func(), error) {
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opts := []option.ClientOption{
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option.WithTokenSource(oauth2.TokenSource(ts)),
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useragent.ClientOption("server"),
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}
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exp, err := stackdriver.NewExporter(stackdriver.Options{
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ProjectID: string(id),
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MonitoringClientOptions: opts,
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TraceClientOptions: opts,
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MonitoredResource: mr,
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})
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if err != nil {
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return nil, nil, err
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}
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return exp, func() { exp.Flush() }, err
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}
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// NewRequestLogger returns a request logger that sends entries to stdout.
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func NewRequestLogger() *requestlog.StackdriverLogger {
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// For now, request logs are written to stdout and get picked up by fluentd.
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// This also works when running locally.
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return requestlog.NewStackdriverLogger(os.Stdout, func(e error) { fmt.Println(e) })
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}
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