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pools.go
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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"
"strings"
"sync"
"time"
"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
var HTTPTransport = &http.Transport{MaxIdleConnsPerHost: MaxIdleConnsPerHost}
var HTTPClient = &http.Client{Transport: HTTPTransport, Timeout: ClientTimeOut}
// Use this client for reading from streams that should be open for an extended duration.
var HTTPClientForStreaming = &http.Client{Transport: HTTPTransport, Timeout: 0}
// 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
// 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"`
}
// A Pool of nodes and buckets.
type Pool struct {
BucketMap map[string]*Bucket
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
}
// 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
Capabilities []string `json:"bucketCapabilities"`
CapabilitiesVersion string `json:"bucketCapabilitiesVer"`
CollectionsManifestUid string `json:"collectionsManifestUid"`
Type string `json:"bucketType"`
Name string `json:"name"`
NodeLocator string `json:"nodeLocator"`
Quota map[string]float64 `json:"quota,omitempty"`
Replicas int `json:"replicaNumber"`
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
dedicatedPool bool // Set if the pool instance above caters to this Bucket alone
}
// 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"`
}
// 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 {
Hostname string `json:"hostname"`
Ports map[string]int `json:"ports"`
}
type BucketNotFoundError struct {
bucket string
}
func (e *BucketNotFoundError) Error() string {
return fmt.Sprint("No bucket named '" + e.bucket + "'")
}
type BucketAuth struct {
name string
pwd string
bucket string
}
func newBucketAuth(name string, pass string, bucket string) *BucketAuth {
return &BucketAuth{name: name, pwd: pass, bucket: bucket}
}
func (ba *BucketAuth) GetCredentials() (string, string, string) {
return ba.name, ba.pwd, 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.
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) {
// get a connection from the pool
conn, pool, err := b.getRandomConnection()
if err != nil {
return nil, err
}
conn.SetDeadline(getDeadline(time.Time{}, DefaultTimeout))
// 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.
if conn.LastBucket() != b.Name {
_, err = conn.SelectBucket(b.Name)
if err != nil {
return nil, err
}
}
// get a randomm document from the connection
doc, err := conn.GetRandomDoc(context...)
// 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}
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()
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}
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()
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)
}
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
}
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
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{
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{
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
}
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
if skipVerify {
tr = &http.Transport{
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{
TLSClientConfig: cfg,
MaxIdleConnsPerHost: MaxIdleConnsPerHost,
}
}
client = &http.Client{Transport: tr, Timeout: ClientTimeOut}
} 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)
}
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)
}
func doOutputAPI(
httpVerb string,
baseURL *url.URL,
path string,
params map[string]interface{},
authHandler AuthHandler,
out interface{},
terse bool) 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
}
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 {
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))
}
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
}
}
return nil
}
func queryRestAPI(
baseURL *url.URL,
path string,
authHandler AuthHandler,
out interface{},
terse bool) 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 := 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))
}
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
if err = d.Decode(&out); err != nil {
return fmt.Errorf("json decode err: %#v, for requestUrl: %s",
err, requestUrl)
}
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)
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
}