forgejo-federation/vendor/github.com/couchbase/go-couchbase/pools.go

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package couchbase
import (
"bufio"
"bytes"
"crypto/tls"
"crypto/x509"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"math/rand"
"net/http"
"net/url"
"runtime"
"sort"
"strconv"
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"strings"
"sync"
"time"
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"unsafe"
"github.com/couchbase/goutils/logging"
"github.com/couchbase/gomemcached" // package name is 'gomemcached'
"github.com/couchbase/gomemcached/client" // package name is 'memcached'
)
// HTTPClient to use for REST and view operations.
var MaxIdleConnsPerHost = 256
var ClientTimeOut = 10 * time.Second
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var HTTPTransport = &http.Transport{MaxIdleConnsPerHost: MaxIdleConnsPerHost}
var HTTPClient = &http.Client{Transport: HTTPTransport, Timeout: ClientTimeOut}
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// Use this client for reading from streams that should be open for an extended duration.
var HTTPClientForStreaming = &http.Client{Transport: HTTPTransport, Timeout: 0}
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// PoolSize is the size of each connection pool (per host).
var PoolSize = 64
// PoolOverflow is the number of overflow connections allowed in a
// pool.
var PoolOverflow = 16
// AsynchronousCloser turns on asynchronous closing for overflow connections
var AsynchronousCloser = false
// TCP KeepAlive enabled/disabled
var TCPKeepalive = false
// Enable MutationToken
var EnableMutationToken = false
// Enable Data Type response
var EnableDataType = false
// Enable Xattr
var EnableXattr = false
// Enable Collections
var EnableCollections = false
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// TCP keepalive interval in seconds. Default 30 minutes
var TCPKeepaliveInterval = 30 * 60
// Used to decide whether to skip verification of certificates when
// connecting to an ssl port.
var skipVerify = true
var certFile = ""
var keyFile = ""
var rootFile = ""
func SetSkipVerify(skip bool) {
skipVerify = skip
}
func SetCertFile(cert string) {
certFile = cert
}
func SetKeyFile(cert string) {
keyFile = cert
}
func SetRootFile(cert string) {
rootFile = cert
}
// Allow applications to speciify the Poolsize and Overflow
func SetConnectionPoolParams(size, overflow int) {
if size > 0 {
PoolSize = size
}
if overflow > 0 {
PoolOverflow = overflow
}
}
// Turn off overflow connections
func DisableOverflowConnections() {
PoolOverflow = 0
}
// Toggle asynchronous overflow closer
func EnableAsynchronousCloser(closer bool) {
AsynchronousCloser = closer
}
// Allow TCP keepalive parameters to be set by the application
func SetTcpKeepalive(enabled bool, interval int) {
TCPKeepalive = enabled
if interval > 0 {
TCPKeepaliveInterval = interval
}
}
// AuthHandler is a callback that gets the auth username and password
// for the given bucket.
type AuthHandler interface {
GetCredentials() (string, string, string)
}
// AuthHandler is a callback that gets the auth username and password
// for the given bucket and sasl for memcached.
type AuthWithSaslHandler interface {
AuthHandler
GetSaslCredentials() (string, string)
}
// MultiBucketAuthHandler is kind of AuthHandler that may perform
// different auth for different buckets.
type MultiBucketAuthHandler interface {
AuthHandler
ForBucket(bucket string) AuthHandler
}
// HTTPAuthHandler is kind of AuthHandler that performs more general
// for outgoing http requests than is possible via simple
// GetCredentials() call (i.e. digest auth or different auth per
// different destinations).
type HTTPAuthHandler interface {
AuthHandler
SetCredsForRequest(req *http.Request) error
}
// RestPool represents a single pool returned from the pools REST API.
type RestPool struct {
Name string `json:"name"`
StreamingURI string `json:"streamingUri"`
URI string `json:"uri"`
}
// Pools represents the collection of pools as returned from the REST API.
type Pools struct {
ComponentsVersion map[string]string `json:"componentsVersion,omitempty"`
ImplementationVersion string `json:"implementationVersion"`
IsAdmin bool `json:"isAdminCreds"`
UUID string `json:"uuid"`
Pools []RestPool `json:"pools"`
}
// A Node is a computer in a cluster running the couchbase software.
type Node struct {
ClusterCompatibility int `json:"clusterCompatibility"`
ClusterMembership string `json:"clusterMembership"`
CouchAPIBase string `json:"couchApiBase"`
Hostname string `json:"hostname"`
AlternateNames map[string]NodeAlternateNames `json:"alternateAddresses"`
InterestingStats map[string]float64 `json:"interestingStats,omitempty"`
MCDMemoryAllocated float64 `json:"mcdMemoryAllocated"`
MCDMemoryReserved float64 `json:"mcdMemoryReserved"`
MemoryFree float64 `json:"memoryFree"`
MemoryTotal float64 `json:"memoryTotal"`
OS string `json:"os"`
Ports map[string]int `json:"ports"`
Services []string `json:"services"`
Status string `json:"status"`
Uptime int `json:"uptime,string"`
Version string `json:"version"`
ThisNode bool `json:"thisNode,omitempty"`
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}
// A Pool of nodes and buckets.
type Pool struct {
BucketMap map[string]*Bucket
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Nodes []Node
BucketURL map[string]string `json:"buckets"`
MemoryQuota float64 `json:"memoryQuota"`
CbasMemoryQuota float64 `json:"cbasMemoryQuota"`
EventingMemoryQuota float64 `json:"eventingMemoryQuota"`
FtsMemoryQuota float64 `json:"ftsMemoryQuota"`
IndexMemoryQuota float64 `json:"indexMemoryQuota"`
client *Client
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}
// VBucketServerMap is the a mapping of vbuckets to nodes.
type VBucketServerMap struct {
HashAlgorithm string `json:"hashAlgorithm"`
NumReplicas int `json:"numReplicas"`
ServerList []string `json:"serverList"`
VBucketMap [][]int `json:"vBucketMap"`
}
type DurablitySettings struct {
Persist PersistTo
Observe ObserveTo
}
// Bucket is the primary entry point for most data operations.
// Bucket is a locked data structure. All access to its fields should be done using read or write locking,
// as appropriate.
//
// Some access methods require locking, but rely on the caller to do so. These are appropriate
// for calls from methods that have already locked the structure. Methods like this
// take a boolean parameter "bucketLocked".
type Bucket struct {
sync.RWMutex
AuthType string `json:"authType"`
Capabilities []string `json:"bucketCapabilities"`
CapabilitiesVersion string `json:"bucketCapabilitiesVer"`
CollectionsManifestUid string `json:"collectionsManifestUid"`
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Type string `json:"bucketType"`
Name string `json:"name"`
NodeLocator string `json:"nodeLocator"`
Quota map[string]float64 `json:"quota,omitempty"`
Replicas int `json:"replicaNumber"`
Password string `json:"saslPassword"`
URI string `json:"uri"`
StreamingURI string `json:"streamingUri"`
LocalRandomKeyURI string `json:"localRandomKeyUri,omitempty"`
UUID string `json:"uuid"`
ConflictResolutionType string `json:"conflictResolutionType,omitempty"`
DDocs struct {
URI string `json:"uri"`
} `json:"ddocs,omitempty"`
BasicStats map[string]interface{} `json:"basicStats,omitempty"`
Controllers map[string]interface{} `json:"controllers,omitempty"`
// These are used for JSON IO, but isn't used for processing
// since it needs to be swapped out safely.
VBSMJson VBucketServerMap `json:"vBucketServerMap"`
NodesJSON []Node `json:"nodes"`
pool *Pool
connPools unsafe.Pointer // *[]*connectionPool
vBucketServerMap unsafe.Pointer // *VBucketServerMap
nodeList unsafe.Pointer // *[]Node
commonSufix string
ah AuthHandler // auth handler
ds *DurablitySettings // Durablity Settings for this bucket
closed bool
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}
// PoolServices is all the bucket-independent services in a pool
type PoolServices struct {
Rev int `json:"rev"`
NodesExt []NodeServices `json:"nodesExt"`
Capabilities json.RawMessage `json:"clusterCapabilities"`
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}
// NodeServices is all the bucket-independent services running on
// a node (given by Hostname)
type NodeServices struct {
Services map[string]int `json:"services,omitempty"`
Hostname string `json:"hostname"`
ThisNode bool `json:"thisNode"`
AlternateNames map[string]NodeAlternateNames `json:"alternateAddresses"`
}
type NodeAlternateNames struct {
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Hostname string `json:"hostname"`
Ports map[string]int `json:"ports"`
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}
type BucketNotFoundError struct {
bucket string
}
func (e *BucketNotFoundError) Error() string {
return fmt.Sprint("No bucket named " + e.bucket)
}
type BucketAuth struct {
name string
saslPwd string
bucket string
}
func newBucketAuth(name string, pass string, bucket string) *BucketAuth {
return &BucketAuth{name: name, saslPwd: pass, bucket: bucket}
}
func (ba *BucketAuth) GetCredentials() (string, string, string) {
return ba.name, ba.saslPwd, ba.bucket
}
// VBServerMap returns the current VBucketServerMap.
func (b *Bucket) VBServerMap() *VBucketServerMap {
b.RLock()
defer b.RUnlock()
ret := (*VBucketServerMap)(b.vBucketServerMap)
return ret
}
func (b *Bucket) GetVBmap(addrs []string) (map[string][]uint16, error) {
vbmap := b.VBServerMap()
servers := vbmap.ServerList
if addrs == nil {
addrs = vbmap.ServerList
}
m := make(map[string][]uint16)
for _, addr := range addrs {
m[addr] = make([]uint16, 0)
}
for vbno, idxs := range vbmap.VBucketMap {
if len(idxs) == 0 {
return nil, fmt.Errorf("vbmap: No KV node no for vb %d", vbno)
} else if idxs[0] < 0 || idxs[0] >= len(servers) {
return nil, fmt.Errorf("vbmap: Invalid KV node no %d for vb %d", idxs[0], vbno)
}
addr := servers[idxs[0]]
if _, ok := m[addr]; ok {
m[addr] = append(m[addr], uint16(vbno))
}
}
return m, nil
}
// true if node is not on the bucket VBmap
func (b *Bucket) checkVBmap(node string) bool {
vbmap := b.VBServerMap()
servers := vbmap.ServerList
for _, idxs := range vbmap.VBucketMap {
if len(idxs) == 0 {
return true
} else if idxs[0] < 0 || idxs[0] >= len(servers) {
return true
}
if servers[idxs[0]] == node {
return false
}
}
return true
}
func (b *Bucket) GetName() string {
b.RLock()
defer b.RUnlock()
ret := b.Name
return ret
}
func (b *Bucket) GetUUID() string {
b.RLock()
defer b.RUnlock()
ret := b.UUID
return ret
}
// Nodes returns the current list of nodes servicing this bucket.
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func (b *Bucket) Nodes() []Node {
b.RLock()
defer b.RUnlock()
ret := *(*[]Node)(b.nodeList)
return ret
}
// return the list of healthy nodes
func (b *Bucket) HealthyNodes() []Node {
nodes := []Node{}
for _, n := range b.Nodes() {
if n.Status == "healthy" && n.CouchAPIBase != "" {
nodes = append(nodes, n)
}
if n.Status != "healthy" { // log non-healthy node
logging.Infof("Non-healthy node; node details:")
logging.Infof("Hostname=%v, Status=%v, CouchAPIBase=%v, ThisNode=%v", n.Hostname, n.Status, n.CouchAPIBase, n.ThisNode)
}
}
return nodes
}
func (b *Bucket) getConnPools(bucketLocked bool) []*connectionPool {
if !bucketLocked {
b.RLock()
defer b.RUnlock()
}
if b.connPools != nil {
return *(*[]*connectionPool)(b.connPools)
} else {
return nil
}
}
func (b *Bucket) replaceConnPools(with []*connectionPool) {
b.Lock()
defer b.Unlock()
old := b.connPools
b.connPools = unsafe.Pointer(&with)
if old != nil {
for _, pool := range *(*[]*connectionPool)(old) {
if pool != nil {
pool.Close()
}
}
}
return
}
func (b *Bucket) getConnPool(i int) *connectionPool {
if i < 0 {
return nil
}
p := b.getConnPools(false /* not already locked */)
if len(p) > i {
return p[i]
}
return nil
}
func (b *Bucket) getConnPoolByHost(host string, bucketLocked bool) *connectionPool {
pools := b.getConnPools(bucketLocked)
for _, p := range pools {
if p != nil && p.host == host {
return p
}
}
return nil
}
// Given a vbucket number, returns a memcached connection to it.
// The connection must be returned to its pool after use.
func (b *Bucket) getConnectionToVBucket(vb uint32) (*memcached.Client, *connectionPool, error) {
for {
vbm := b.VBServerMap()
if len(vbm.VBucketMap) < int(vb) {
return nil, nil, fmt.Errorf("go-couchbase: vbmap smaller than vbucket list: %v vs. %v",
vb, vbm.VBucketMap)
}
masterId := vbm.VBucketMap[vb][0]
if masterId < 0 {
return nil, nil, fmt.Errorf("go-couchbase: No master for vbucket %d", vb)
}
pool := b.getConnPool(masterId)
conn, err := pool.Get()
if err != errClosedPool {
return conn, pool, err
}
// If conn pool was closed, because another goroutine refreshed the vbucket map, retry...
}
}
// To get random documents, we need to cover all the nodes, so select
// a connection at random.
func (b *Bucket) getRandomConnection() (*memcached.Client, *connectionPool, error) {
for {
var currentPool = 0
pools := b.getConnPools(false /* not already locked */)
if len(pools) == 0 {
return nil, nil, fmt.Errorf("No connection pool found")
} else if len(pools) > 1 { // choose a random connection
currentPool = rand.Intn(len(pools))
} // if only one pool, currentPool defaults to 0, i.e., the only pool
// get the pool
pool := pools[currentPool]
conn, err := pool.Get()
if err != errClosedPool {
return conn, pool, err
}
// If conn pool was closed, because another goroutine refreshed the vbucket map, retry...
}
}
//
// Get a random document from a bucket. Since the bucket may be distributed
// across nodes, we must first select a random connection, and then use the
// Client.GetRandomDoc() call to get a random document from that node.
//
func (b *Bucket) GetRandomDoc(context ...*memcached.ClientContext) (*gomemcached.MCResponse, error) {
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// get a connection from the pool
conn, pool, err := b.getRandomConnection()
if err != nil {
return nil, err
}
conn.SetDeadline(getDeadline(time.Time{}, DefaultTimeout))
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// We may need to select the bucket before GetRandomDoc()
// will work. This is sometimes done at startup (see defaultMkConn())
// but not always, depending on the auth type.
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if conn.LastBucket() != b.Name {
_, err = conn.SelectBucket(b.Name)
if err != nil {
return nil, err
}
}
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// get a randomm document from the connection
doc, err := conn.GetRandomDoc(context...)
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// need to return the connection to the pool
pool.Return(conn)
return doc, err
}
// Bucket DDL
func uriAdj(s string) string {
return strings.Replace(s, "%", "%25", -1)
}
func (b *Bucket) CreateScope(scope string) error {
b.RLock()
pool := b.pool
client := pool.client
b.RUnlock()
args := map[string]interface{}{"name": scope}
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return client.parsePostURLResponseTerse("/pools/default/buckets/"+uriAdj(b.Name)+"/scopes", args, nil)
}
func (b *Bucket) DropScope(scope string) error {
b.RLock()
pool := b.pool
client := pool.client
b.RUnlock()
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return client.parseDeleteURLResponseTerse("/pools/default/buckets/"+uriAdj(b.Name)+"/scopes/"+uriAdj(scope), nil, nil)
}
func (b *Bucket) CreateCollection(scope string, collection string) error {
b.RLock()
pool := b.pool
client := pool.client
b.RUnlock()
args := map[string]interface{}{"name": collection}
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return client.parsePostURLResponseTerse("/pools/default/buckets/"+uriAdj(b.Name)+"/scopes/"+uriAdj(scope)+"/collections", args, nil)
}
func (b *Bucket) DropCollection(scope string, collection string) error {
b.RLock()
pool := b.pool
client := pool.client
b.RUnlock()
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return client.parseDeleteURLResponseTerse("/pools/default/buckets/"+uriAdj(b.Name)+"/scopes/"+uriAdj(scope)+"/collections/"+uriAdj(collection), nil, nil)
}
func (b *Bucket) FlushCollection(scope string, collection string) error {
b.RLock()
pool := b.pool
client := pool.client
b.RUnlock()
args := map[string]interface{}{"name": collection, "scope": scope}
return client.parsePostURLResponseTerse("/pools/default/buckets/"+uriAdj(b.Name)+"/collections-flush", args, nil)
}
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func (b *Bucket) getMasterNode(i int) string {
p := b.getConnPools(false /* not already locked */)
if len(p) > i {
return p[i].host
}
return ""
}
func (b *Bucket) authHandler(bucketLocked bool) (ah AuthHandler) {
if !bucketLocked {
b.RLock()
defer b.RUnlock()
}
pool := b.pool
name := b.Name
if pool != nil {
ah = pool.client.ah
}
if mbah, ok := ah.(MultiBucketAuthHandler); ok {
return mbah.ForBucket(name)
}
if ah == nil {
ah = &basicAuth{name, ""}
}
return
}
// NodeAddresses gets the (sorted) list of memcached node addresses
// (hostname:port).
func (b *Bucket) NodeAddresses() []string {
vsm := b.VBServerMap()
rv := make([]string, len(vsm.ServerList))
copy(rv, vsm.ServerList)
sort.Strings(rv)
return rv
}
// CommonAddressSuffix finds the longest common suffix of all
// host:port strings in the node list.
func (b *Bucket) CommonAddressSuffix() string {
input := []string{}
for _, n := range b.Nodes() {
input = append(input, n.Hostname)
}
return FindCommonSuffix(input)
}
// A Client is the starting point for all services across all buckets
// in a Couchbase cluster.
type Client struct {
BaseURL *url.URL
ah AuthHandler
Info Pools
tlsConfig *tls.Config
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}
func maybeAddAuth(req *http.Request, ah AuthHandler) error {
if hah, ok := ah.(HTTPAuthHandler); ok {
return hah.SetCredsForRequest(req)
}
if ah != nil {
user, pass, _ := ah.GetCredentials()
req.Header.Set("Authorization", "Basic "+
base64.StdEncoding.EncodeToString([]byte(user+":"+pass)))
}
return nil
}
// arbitary number, may need to be tuned #FIXME
const HTTP_MAX_RETRY = 5
// Someday golang network packages will implement standard
// error codes. Until then #sigh
func isHttpConnError(err error) bool {
estr := err.Error()
return strings.Contains(estr, "broken pipe") ||
strings.Contains(estr, "broken connection") ||
strings.Contains(estr, "connection reset")
}
var client *http.Client
var clientForStreaming *http.Client
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func ClientConfigForX509(certFile, keyFile, rootFile string) (*tls.Config, error) {
cfg := &tls.Config{}
if certFile != "" && keyFile != "" {
tlsCert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
return nil, err
}
cfg.Certificates = []tls.Certificate{tlsCert}
} else {
//error need to pass both certfile and keyfile
return nil, fmt.Errorf("N1QL: Need to pass both certfile and keyfile")
}
var caCert []byte
var err1 error
caCertPool := x509.NewCertPool()
if rootFile != "" {
// Read that value in
caCert, err1 = ioutil.ReadFile(rootFile)
if err1 != nil {
return nil, fmt.Errorf(" Error in reading cacert file, err: %v", err1)
}
caCertPool.AppendCertsFromPEM(caCert)
}
cfg.RootCAs = caCertPool
return cfg, nil
}
// This version of doHTTPRequest is for requests where the response connection is held open
// for an extended duration since line is a new and significant output.
//
// The ordinary version of this method expects the results to arrive promptly, and
// therefore use an HTTP client with a timeout. This client is not suitable
// for streaming use.
func doHTTPRequestForStreaming(req *http.Request) (*http.Response, error) {
var err error
var res *http.Response
// we need a client that ignores certificate errors, since we self-sign
// our certs
if clientForStreaming == nil && req.URL.Scheme == "https" {
var tr *http.Transport
if skipVerify {
tr = &http.Transport{
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TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
MaxIdleConnsPerHost: MaxIdleConnsPerHost,
}
} else {
// Handle cases with cert
cfg, err := ClientConfigForX509(certFile, keyFile, rootFile)
if err != nil {
return nil, err
}
tr = &http.Transport{
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TLSClientConfig: cfg,
MaxIdleConnsPerHost: MaxIdleConnsPerHost,
}
}
clientForStreaming = &http.Client{Transport: tr, Timeout: 0}
} else if clientForStreaming == nil {
clientForStreaming = HTTPClientForStreaming
}
for i := 0; i < HTTP_MAX_RETRY; i++ {
res, err = clientForStreaming.Do(req)
if err != nil && isHttpConnError(err) {
continue
}
break
}
if err != nil {
return nil, err
}
return res, err
}
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func doHTTPRequest(req *http.Request) (*http.Response, error) {
var err error
var res *http.Response
// we need a client that ignores certificate errors, since we self-sign
// our certs
if client == nil && req.URL.Scheme == "https" {
var tr *http.Transport
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if skipVerify {
tr = &http.Transport{
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TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
MaxIdleConnsPerHost: MaxIdleConnsPerHost,
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}
} else {
// Handle cases with cert
cfg, err := ClientConfigForX509(certFile, keyFile, rootFile)
if err != nil {
return nil, err
}
tr = &http.Transport{
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TLSClientConfig: cfg,
MaxIdleConnsPerHost: MaxIdleConnsPerHost,
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}
}
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client = &http.Client{Transport: tr, Timeout: ClientTimeOut}
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} else if client == nil {
client = HTTPClient
}
for i := 0; i < HTTP_MAX_RETRY; i++ {
res, err = client.Do(req)
if err != nil && isHttpConnError(err) {
continue
}
break
}
if err != nil {
return nil, err
}
return res, err
}
func doPutAPI(baseURL *url.URL, path string, params map[string]interface{}, authHandler AuthHandler, out interface{}, terse bool) error {
return doOutputAPI("PUT", baseURL, path, params, authHandler, out, terse)
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}
func doPostAPI(baseURL *url.URL, path string, params map[string]interface{}, authHandler AuthHandler, out interface{}, terse bool) error {
return doOutputAPI("POST", baseURL, path, params, authHandler, out, terse)
}
func doDeleteAPI(baseURL *url.URL, path string, params map[string]interface{}, authHandler AuthHandler, out interface{}, terse bool) error {
return doOutputAPI("DELETE", baseURL, path, params, authHandler, out, terse)
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}
func doOutputAPI(
httpVerb string,
baseURL *url.URL,
path string,
params map[string]interface{},
authHandler AuthHandler,
out interface{},
terse bool) error {
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var requestUrl string
if q := strings.Index(path, "?"); q > 0 {
requestUrl = baseURL.Scheme + "://" + baseURL.Host + path[:q] + "?" + path[q+1:]
} else {
requestUrl = baseURL.Scheme + "://" + baseURL.Host + path
}
postData := url.Values{}
for k, v := range params {
postData.Set(k, fmt.Sprintf("%v", v))
}
req, err := http.NewRequest(httpVerb, requestUrl, bytes.NewBufferString(postData.Encode()))
if err != nil {
return err
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
err = maybeAddAuth(req, authHandler)
if err != nil {
return err
}
res, err := doHTTPRequest(req)
if err != nil {
return err
}
defer res.Body.Close()
// 200 - ok, 202 - accepted (asynchronously)
if res.StatusCode != 200 && res.StatusCode != 202 {
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bod, _ := ioutil.ReadAll(io.LimitReader(res.Body, 512))
if terse {
var outBuf interface{}
err := json.Unmarshal(bod, &outBuf)
if err == nil && outBuf != nil {
switch errText := outBuf.(type) {
case string:
return fmt.Errorf("%s", errText)
case map[string]interface{}:
errField := errText["errors"]
if errField != nil {
// remove annoying 'map' prefix
return fmt.Errorf("%s", strings.TrimPrefix(fmt.Sprintf("%v", errField), "map"))
}
}
}
return fmt.Errorf("%s", string(bod))
}
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return fmt.Errorf("HTTP error %v getting %q: %s",
res.Status, requestUrl, bod)
}
d := json.NewDecoder(res.Body)
// PUT/POST/DELETE request may not have a response body
if d.More() {
if err = d.Decode(&out); err != nil {
return err
}
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}
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return nil
}
func queryRestAPI(
baseURL *url.URL,
path string,
authHandler AuthHandler,
out interface{},
terse bool) error {
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var requestUrl string
if q := strings.Index(path, "?"); q > 0 {
requestUrl = baseURL.Scheme + "://" + baseURL.Host + path[:q] + "?" + path[q+1:]
} else {
requestUrl = baseURL.Scheme + "://" + baseURL.Host + path
}
req, err := http.NewRequest("GET", requestUrl, nil)
if err != nil {
return err
}
err = maybeAddAuth(req, authHandler)
if err != nil {
return err
}
res, err := doHTTPRequest(req)
if err != nil {
return err
}
defer res.Body.Close()
if res.StatusCode != 200 {
bod, _ := ioutil.ReadAll(io.LimitReader(res.Body, 512))
if terse {
var outBuf interface{}
err := json.Unmarshal(bod, &outBuf)
if err == nil && outBuf != nil {
errText, ok := outBuf.(string)
if ok {
return fmt.Errorf(errText)
}
}
return fmt.Errorf(string(bod))
}
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return fmt.Errorf("HTTP error %v getting %q: %s",
res.Status, requestUrl, bod)
}
d := json.NewDecoder(res.Body)
// GET request should have a response body
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if err = d.Decode(&out); err != nil {
return fmt.Errorf("json decode err: %#v, for requestUrl: %s",
err, requestUrl)
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}
return nil
}
func (c *Client) ProcessStream(path string, callb func(interface{}) error, data interface{}) error {
return c.processStream(c.BaseURL, path, c.ah, callb, data)
}
// Based on code in http://src.couchbase.org/source/xref/trunk/goproj/src/github.com/couchbase/indexing/secondary/dcp/pools.go#309
func (c *Client) processStream(baseURL *url.URL, path string, authHandler AuthHandler, callb func(interface{}) error, data interface{}) error {
var requestUrl string
if q := strings.Index(path, "?"); q > 0 {
requestUrl = baseURL.Scheme + "://" + baseURL.Host + path[:q] + "?" + path[q+1:]
} else {
requestUrl = baseURL.Scheme + "://" + baseURL.Host + path
}
req, err := http.NewRequest("GET", requestUrl, nil)
if err != nil {
return err
}
err = maybeAddAuth(req, authHandler)
if err != nil {
return err
}
res, err := doHTTPRequestForStreaming(req)
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if err != nil {
return err
}
defer res.Body.Close()
if res.StatusCode != 200 {
bod, _ := ioutil.ReadAll(io.LimitReader(res.Body, 512))
return fmt.Errorf("HTTP error %v getting %q: %s",
res.Status, requestUrl, bod)
}
reader := bufio.NewReader(res.Body)
for {
bs, err := reader.ReadBytes('\n')
if err != nil {
return err
}
if len(bs) == 1 && bs[0] == '\n' {
continue
}
err = json.Unmarshal(bs, data)
if err != nil {
return err
}
err = callb(data)
if err != nil {
return err
}
}
return nil
}
func (c *Client) parseURLResponse(path string, out interface{}) error {
return queryRestAPI(c.BaseURL, path, c.ah, out, false)
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}
func (c *Client) parsePostURLResponse(path string, params map[string]interface{}, out interface{}) error {
return doPostAPI(c.BaseURL, path, params, c.ah, out, false)
}
func (c *Client) parsePostURLResponseTerse(path string, params map[string]interface{}, out interface{}) error {
return doPostAPI(c.BaseURL, path, params, c.ah, out, true)
}
func (c *Client) parseDeleteURLResponse(path string, params map[string]interface{}, out interface{}) error {
return doDeleteAPI(c.BaseURL, path, params, c.ah, out, false)
}
func (c *Client) parseDeleteURLResponseTerse(path string, params map[string]interface{}, out interface{}) error {
return doDeleteAPI(c.BaseURL, path, params, c.ah, out, true)
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}
func (c *Client) parsePutURLResponse(path string, params map[string]interface{}, out interface{}) error {
return doPutAPI(c.BaseURL, path, params, c.ah, out, false)
}
func (c *Client) parsePutURLResponseTerse(path string, params map[string]interface{}, out interface{}) error {
return doPutAPI(c.BaseURL, path, params, c.ah, out, true)
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}
func (b *Bucket) parseURLResponse(path string, out interface{}) error {
nodes := b.Nodes()
if len(nodes) == 0 {
return errors.New("no couch rest URLs")
}
// Pick a random node to start querying.
startNode := rand.Intn(len(nodes))
maxRetries := len(nodes)
for i := 0; i < maxRetries; i++ {
node := nodes[(startNode+i)%len(nodes)] // Wrap around the nodes list.
// Skip non-healthy nodes.
if node.Status != "healthy" || node.CouchAPIBase == "" {
continue
}
url := &url.URL{
Host: node.Hostname,
Scheme: "http",
}
// Lock here to avoid having pool closed under us.
b.RLock()
err := queryRestAPI(url, path, b.pool.client.ah, out, false)
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b.RUnlock()
if err == nil {
return err
}
}
return errors.New("All nodes failed to respond or no healthy nodes for bucket found")
}
func (b *Bucket) parseAPIResponse(path string, out interface{}) error {
nodes := b.Nodes()
if len(nodes) == 0 {
return errors.New("no couch rest URLs")
}
var err error
var u *url.URL
// Pick a random node to start querying.
startNode := rand.Intn(len(nodes))
maxRetries := len(nodes)
for i := 0; i < maxRetries; i++ {
node := nodes[(startNode+i)%len(nodes)] // Wrap around the nodes list.
// Skip non-healthy nodes.
if node.Status != "healthy" || node.CouchAPIBase == "" {
continue
}
u, err = ParseURL(node.CouchAPIBase)
// Lock here so pool does not get closed under us.
b.RLock()
if err != nil {
b.RUnlock()
return fmt.Errorf("config error: Bucket %q node #%d CouchAPIBase=%q: %v",
b.Name, i, node.CouchAPIBase, err)
} else if b.pool != nil {
u.User = b.pool.client.BaseURL.User
}
u.Path = path
// generate the path so that the strings are properly escaped
// MB-13770
requestPath := strings.Split(u.String(), u.Host)[1]
err = queryRestAPI(u, requestPath, b.pool.client.ah, out, false)
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b.RUnlock()
if err == nil {
return err
}
}
var errStr string
if err != nil {
errStr = "Error " + err.Error()
}
return errors.New("All nodes failed to respond or returned error or no healthy nodes for bucket found." + errStr)
}
type basicAuth struct {
u, p string
}
func (b basicAuth) GetCredentials() (string, string, string) {
return b.u, b.p, b.u
}
func basicAuthFromURL(us string) (ah AuthHandler) {
u, err := ParseURL(us)
if err != nil {
return
}
if user := u.User; user != nil {
pw, _ := user.Password()
ah = basicAuth{user.Username(), pw}
}
return
}
// ConnectWithAuth connects to a couchbase cluster with the given
// authentication handler.
func ConnectWithAuth(baseU string, ah AuthHandler) (c Client, err error) {
c.BaseURL, err = ParseURL(baseU)
if err != nil {
return
}
c.ah = ah
return c, c.parseURLResponse("/pools", &c.Info)
}
// Call this method with a TLS certificate file name to make communication
// with the KV engine encrypted.
//
// This method should be called immediately after a Connect*() method.
func (c *Client) InitTLS(certFile string) error {
serverCert, err := ioutil.ReadFile(certFile)
if err != nil {
return err
}
CA_Pool := x509.NewCertPool()
CA_Pool.AppendCertsFromPEM(serverCert)
c.tlsConfig = &tls.Config{RootCAs: CA_Pool}
return nil
}
func (c *Client) ClearTLS() {
c.tlsConfig = nil
}
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// ConnectWithAuthCreds connects to a couchbase cluster with the give
// authorization creds returned by cb_auth
func ConnectWithAuthCreds(baseU, username, password string) (c Client, err error) {
c.BaseURL, err = ParseURL(baseU)
if err != nil {
return
}
c.ah = newBucketAuth(username, password, "")
return c, c.parseURLResponse("/pools", &c.Info)
}
// Connect to a couchbase cluster. An authentication handler will be
// created from the userinfo in the URL if provided.
func Connect(baseU string) (Client, error) {
return ConnectWithAuth(baseU, basicAuthFromURL(baseU))
}
type BucketInfo struct {
Name string // name of bucket
Password string // SASL password of bucket
}
//Get SASL buckets
func GetBucketList(baseU string) (bInfo []BucketInfo, err error) {
c := &Client{}
c.BaseURL, err = ParseURL(baseU)
if err != nil {
return
}
c.ah = basicAuthFromURL(baseU)
var buckets []Bucket
err = c.parseURLResponse("/pools/default/buckets", &buckets)
if err != nil {
return
}
bInfo = make([]BucketInfo, 0)
for _, bucket := range buckets {
bucketInfo := BucketInfo{Name: bucket.Name, Password: bucket.Password}
bInfo = append(bInfo, bucketInfo)
}
return bInfo, err
}
//Set viewUpdateDaemonOptions
func SetViewUpdateParams(baseU string, params map[string]interface{}) (viewOpts map[string]interface{}, err error) {
c := &Client{}
c.BaseURL, err = ParseURL(baseU)
if err != nil {
return
}
c.ah = basicAuthFromURL(baseU)
if len(params) < 1 {
return nil, fmt.Errorf("No params to set")
}
err = c.parsePostURLResponse("/settings/viewUpdateDaemon", params, &viewOpts)
if err != nil {
return
}
return viewOpts, err
}
// This API lets the caller know, if the list of nodes a bucket is
// connected to has gone through an edit (a rebalance operation)
// since the last update to the bucket, in which case a Refresh is
// advised.
func (b *Bucket) NodeListChanged() bool {
b.RLock()
pool := b.pool
uri := b.URI
b.RUnlock()
tmpb := &Bucket{}
err := pool.client.parseURLResponse(uri, tmpb)
if err != nil {
return true
}
bNodes := *(*[]Node)(b.nodeList)
if len(bNodes) != len(tmpb.NodesJSON) {
return true
}
bucketHostnames := map[string]bool{}
for _, node := range bNodes {
bucketHostnames[node.Hostname] = true
}
for _, node := range tmpb.NodesJSON {
if _, found := bucketHostnames[node.Hostname]; !found {
return true
}
}
return false
}
// Sample data for scopes and collections as returned from the
// /pooles/default/$BUCKET_NAME/collections API.
// {"myScope2":{"myCollectionC":{}},"myScope1":{"myCollectionB":{},"myCollectionA":{}},"_default":{"_default":{}}}
// Structures for parsing collections manifest.
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// The map key is the name of the scope.
// Example data:
// {"uid":"b","scopes":[
// {"name":"_default","uid":"0","collections":[
// {"name":"_default","uid":"0"}]},
// {"name":"myScope1","uid":"8","collections":[
// {"name":"myCollectionB","uid":"c"},
// {"name":"myCollectionA","uid":"b"}]},
// {"name":"myScope2","uid":"9","collections":[
// {"name":"myCollectionC","uid":"d"}]}]}
type InputManifest struct {
Uid string
Scopes []InputScope
}
type InputScope struct {
Name string
Uid string
Collections []InputCollection
}
type InputCollection struct {
Name string
Uid string
}
// Structures for storing collections information.
type Manifest struct {
Uid uint64
Scopes map[string]*Scope // map by name
}
type Scope struct {
Name string
Uid uint64
Collections map[string]*Collection // map by name
}
type Collection struct {
Name string
Uid uint64
}
var _EMPTY_MANIFEST *Manifest = &Manifest{Uid: 0, Scopes: map[string]*Scope{}}
func parseCollectionsManifest(res *gomemcached.MCResponse) (*Manifest, error) {
if !EnableCollections {
return _EMPTY_MANIFEST, nil
}
var im InputManifest
err := json.Unmarshal(res.Body, &im)
if err != nil {
return nil, err
}
uid, err := strconv.ParseUint(im.Uid, 16, 64)
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if err != nil {
return nil, err
}
mani := &Manifest{Uid: uid, Scopes: make(map[string]*Scope, len(im.Scopes))}
for _, iscope := range im.Scopes {
scope_uid, err := strconv.ParseUint(iscope.Uid, 16, 64)
if err != nil {
return nil, err
}
scope := &Scope{Uid: scope_uid, Name: iscope.Name, Collections: make(map[string]*Collection, len(iscope.Collections))}
mani.Scopes[iscope.Name] = scope
for _, icoll := range iscope.Collections {
coll_uid, err := strconv.ParseUint(icoll.Uid, 16, 64)
if err != nil {
return nil, err
}
coll := &Collection{Uid: coll_uid, Name: icoll.Name}
scope.Collections[icoll.Name] = coll
}
}
return mani, nil
}
// This function assumes the bucket is locked.
func (b *Bucket) GetCollectionsManifest() (*Manifest, error) {
// Collections not used?
if !EnableCollections {
return nil, fmt.Errorf("Collections not enabled.")
}
b.RLock()
pools := b.getConnPools(true /* already locked */)
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if len(pools) == 0 {
b.RUnlock()
return nil, fmt.Errorf("Unable to get connection to retrieve collections manifest: no connection pool. No collections access to bucket %s.", b.Name)
}
pool := pools[0] // Any pool will do, so use the first one.
b.RUnlock()
client, err := pool.Get()
if err != nil {
return nil, fmt.Errorf("Unable to get connection to retrieve collections manifest: %v. No collections access to bucket %s.", err, b.Name)
}
client.SetDeadline(getDeadline(time.Time{}, DefaultTimeout))
// We need to select the bucket before GetCollectionsManifest()
// will work. This is sometimes done at startup (see defaultMkConn())
// but not always, depending on the auth type.
// Doing this is safe because we collect the the connections
// by bucket, so the bucket being selected will never change.
_, err = client.SelectBucket(b.Name)
if err != nil {
pool.Return(client)
return nil, fmt.Errorf("Unable to select bucket %s: %v. No collections access to bucket %s.", err, b.Name, b.Name)
}
res, err := client.GetCollectionsManifest()
if err != nil {
pool.Return(client)
return nil, fmt.Errorf("Unable to retrieve collections manifest: %v. No collections access to bucket %s.", err, b.Name)
}
mani, err := parseCollectionsManifest(res)
if err != nil {
pool.Return(client)
return nil, fmt.Errorf("Unable to parse collections manifest: %v. No collections access to bucket %s.", err, b.Name)
}
pool.Return(client)
return mani, nil
}
func (b *Bucket) RefreshFully() error {
return b.refresh(false)
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}
func (b *Bucket) Refresh() error {
return b.refresh(true)
}
func (b *Bucket) refresh(preserveConnections bool) error {
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b.RLock()
pool := b.pool
uri := b.URI
client := pool.client
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b.RUnlock()
var poolServices PoolServices
var err error
if client.tlsConfig != nil {
poolServices, err = client.GetPoolServices("default")
if err != nil {
return err
}
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}
tmpb := &Bucket{}
err = pool.client.parseURLResponse(uri, tmpb)
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if err != nil {
return err
}
pools := b.getConnPools(false /* bucket not already locked */)
// We need this lock to ensure that bucket refreshes happening because
// of NMVb errors received during bulkGet do not end up over-writing
// pool.inUse.
b.Lock()
for _, pool := range pools {
if pool != nil {
pool.inUse = false
}
}
newcps := make([]*connectionPool, len(tmpb.VBSMJson.ServerList))
for i := range newcps {
hostport := tmpb.VBSMJson.ServerList[i]
if preserveConnections {
pool := b.getConnPoolByHost(hostport, true /* bucket already locked */)
if pool != nil && pool.inUse == false && (!pool.encrypted || pool.tlsConfig == client.tlsConfig) {
// if the hostname and index is unchanged then reuse this pool
newcps[i] = pool
pool.inUse = true
continue
}
}
var encrypted bool
if client.tlsConfig != nil {
hostport, encrypted, err = MapKVtoSSL(hostport, &poolServices)
if err != nil {
b.Unlock()
return err
}
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}
if b.ah != nil {
newcps[i] = newConnectionPool(hostport,
b.ah, AsynchronousCloser, PoolSize, PoolOverflow, client.tlsConfig, b.Name, encrypted)
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} else {
newcps[i] = newConnectionPool(hostport,
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b.authHandler(true /* bucket already locked */),
AsynchronousCloser, PoolSize, PoolOverflow, client.tlsConfig, b.Name, encrypted)
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}
}
b.replaceConnPools2(newcps, true /* bucket already locked */)
tmpb.ah = b.ah
b.vBucketServerMap = unsafe.Pointer(&tmpb.VBSMJson)
b.nodeList = unsafe.Pointer(&tmpb.NodesJSON)
b.Unlock()
return nil
}
func (p *Pool) refresh() (err error) {
p.BucketMap = make(map[string]*Bucket)
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buckets := []Bucket{}
err = p.client.parseURLResponse(p.BucketURL["uri"], &buckets)
if err != nil {
return err
}
for i, _ := range buckets {
b := new(Bucket)
*b = buckets[i]
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b.pool = p
b.nodeList = unsafe.Pointer(&b.NodesJSON)
// MB-33185 this is merely defensive, just in case
// refresh() gets called on a perfectly node pool
ob, ok := p.BucketMap[b.Name]
if ok && ob.connPools != nil {
ob.Close()
}
b.replaceConnPools(make([]*connectionPool, len(b.VBSMJson.ServerList)))
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p.BucketMap[b.Name] = b
runtime.SetFinalizer(b, bucketFinalizer)
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}
buckets = nil
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return nil
}
// GetPool gets a pool from within the couchbase cluster (usually
// "default").
func (c *Client) GetPool(name string) (p Pool, err error) {
var poolURI string
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for _, p := range c.Info.Pools {
if p.Name == name {
poolURI = p.URI
break
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}
}
if poolURI == "" {
return p, errors.New("No pool named " + name)
}
err = c.parseURLResponse(poolURI, &p)
if err != nil {
return p, err
}
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p.client = c
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err = p.refresh()
return
}
// GetPoolServices returns all the bucket-independent services in a pool.
// (See "Exposing services outside of bucket context" in http://goo.gl/uuXRkV)
func (c *Client) GetPoolServices(name string) (ps PoolServices, err error) {
var poolName string
for _, p := range c.Info.Pools {
if p.Name == name {
poolName = p.Name
}
}
if poolName == "" {
return ps, errors.New("No pool named " + name)
}
poolURI := "/pools/" + poolName + "/nodeServices"
err = c.parseURLResponse(poolURI, &ps)
return
}
func (b *Bucket) GetPoolServices(name string) (*PoolServices, error) {
b.RLock()
pool := b.pool
b.RUnlock()
ps, err := pool.client.GetPoolServices(name)
if err != nil {
return nil, err
}
return &ps, nil
}
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// Close marks this bucket as no longer needed, closing connections it
// may have open.
func (b *Bucket) Close() {
b.Lock()
defer b.Unlock()
if b.connPools != nil {
for _, c := range b.getConnPools(true /* already locked */) {
if c != nil {
c.Close()
}
}
b.connPools = nil
}
}
func bucketFinalizer(b *Bucket) {
if b.connPools != nil {
if !b.closed {
logging.Warnf("Finalizing a bucket with active connections.")
}
// MB-33185 do not leak connection pools
b.Close()
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}
}
// GetBucket gets a bucket from within this pool.
func (p *Pool) GetBucket(name string) (*Bucket, error) {
rv, ok := p.BucketMap[name]
if !ok {
return nil, &BucketNotFoundError{bucket: name}
}
err := rv.Refresh()
if err != nil {
return nil, err
}
return rv, nil
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}
// GetBucket gets a bucket from within this pool.
func (p *Pool) GetBucketWithAuth(bucket, username, password string) (*Bucket, error) {
rv, ok := p.BucketMap[bucket]
if !ok {
return nil, &BucketNotFoundError{bucket: bucket}
}
rv.ah = newBucketAuth(username, password, bucket)
err := rv.Refresh()
if err != nil {
return nil, err
}
return rv, nil
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}
// GetPool gets the pool to which this bucket belongs.
func (b *Bucket) GetPool() *Pool {
b.RLock()
defer b.RUnlock()
ret := b.pool
return ret
}
// GetClient gets the client from which we got this pool.
func (p *Pool) GetClient() *Client {
return p.client
}
// Release bucket connections when the pool is no longer in use
func (p *Pool) Close() {
// MB-36186 make the bucket map inaccessible
bucketMap := p.BucketMap
p.BucketMap = nil
// fine to loop through the buckets unlocked
// locking happens at the bucket level
for b, _ := range bucketMap {
// MB-36186 make the bucket unreachable and avoid concurrent read/write map panics
bucket := bucketMap[b]
bucketMap[b] = nil
bucket.Lock()
// MB-33208 defer closing connection pools until the bucket is no longer used
// MB-36186 if the bucket is unused make it unreachable straight away
needClose := bucket.connPools == nil && !bucket.closed
if needClose {
runtime.SetFinalizer(&bucket, nil)
}
bucket.closed = true
bucket.Unlock()
if needClose {
bucket.Close()
}
}
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}
// GetBucket is a convenience function for getting a named bucket from
// a URL
func GetBucket(endpoint, poolname, bucketname string) (*Bucket, error) {
var err error
client, err := Connect(endpoint)
if err != nil {
return nil, err
}
pool, err := client.GetPool(poolname)
if err != nil {
return nil, err
}
return pool.GetBucket(bucketname)
}
// ConnectWithAuthAndGetBucket is a convenience function for
// getting a named bucket from a given URL and an auth callback
func ConnectWithAuthAndGetBucket(endpoint, poolname, bucketname string,
ah AuthHandler) (*Bucket, error) {
client, err := ConnectWithAuth(endpoint, ah)
if err != nil {
return nil, err
}
pool, err := client.GetPool(poolname)
if err != nil {
return nil, err
}
return pool.GetBucket(bucketname)
}
func GetSystemBucket(c *Client, p *Pool, name string) (*Bucket, error) {
bucket, err := p.GetBucket(name)
if err != nil {
if _, ok := err.(*BucketNotFoundError); !ok {
return nil, err
}
// create the bucket if not found
args := map[string]interface{}{
"authType": "sasl",
"bucketType": "couchbase",
"name": name,
"ramQuotaMB": 100,
"saslPassword": "donotuse",
}
var ret interface{}
// allow "bucket already exists" error in case duplicate create
// (e.g. two query nodes starting at same time)
err = c.parsePostURLResponseTerse("/pools/default/buckets", args, &ret)
if err != nil && !AlreadyExistsError(err) {
return nil, err
}
// bucket created asynchronously, try to get the bucket
maxRetry := 8
interval := 100 * time.Millisecond
for i := 0; i < maxRetry; i++ {
time.Sleep(interval)
interval *= 2
err = p.refresh()
if err != nil {
return nil, err
}
bucket, err = p.GetBucket(name)
if bucket != nil {
bucket.RLock()
ok := !bucket.closed && len(bucket.getConnPools(true /* already locked */)) > 0
bucket.RUnlock()
if ok {
break
}
} else if err != nil {
if _, ok := err.(*BucketNotFoundError); !ok {
break
}
}
}
}
return bucket, err
}
func DropSystemBucket(c *Client, name string) error {
err := c.parseDeleteURLResponseTerse("/pools/default/buckets/"+name, nil, nil)
return err
}
func AlreadyExistsError(err error) bool {
// Bucket error: Bucket with given name already exists
// Scope error: Scope with this name already exists
// Collection error: Collection with this name already exists
return strings.Contains(err.Error(), " name already exists")
}