forked from couchbaselabs/cbft
/
feed_dcp.go
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/
feed_dcp.go
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// Copyright (c) 2014 Couchbase, Inc.
// 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 cbft
import (
"encoding/json"
"fmt"
"io"
"math/rand"
"strings"
"sync"
"sync/atomic"
log "github.com/couchbase/clog"
"github.com/couchbase/go-couchbase"
"github.com/couchbase/go-couchbase/cbdatasource"
"github.com/couchbase/gomemcached"
)
// DEST_EXTRAS_TYPE_DCP represents the extras that comes from DCP
// protocol.
const DEST_EXTRAS_TYPE_DCP = DestExtrasType(0x0002)
func init() {
RegisterFeedType("couchbase", &FeedType{
Start: StartDCPFeed,
Partitions: CouchbasePartitions,
Public: true,
Description: "general/couchbase" +
" - a Couchbase Server bucket will be the data source",
StartSample: NewDCPFeedParams(),
})
RegisterFeedType("couchbase-dcp", &FeedType{
Start: StartDCPFeed,
Partitions: CouchbasePartitions,
Public: false, // Won't be listed in /api/managerMeta output.
Description: "general/couchbase-dcp" +
" - a Couchbase Server bucket will be the data source," +
" via DCP protocol",
StartSample: NewDCPFeedParams(),
})
}
// StartDCPFeed starts a DCP related feed and is registered at
// init/startup time with the system via RegisterFeedType().
func StartDCPFeed(mgr *Manager, feedName, indexName, indexUUID,
sourceType, sourceName, bucketUUID, params string,
dests map[string]Dest) error {
server, poolName, bucketName :=
CouchbaseParseSourceName(mgr.server, "default", sourceName)
feed, err := NewDCPFeed(feedName, indexName, server, poolName,
bucketName, bucketUUID, params, BasicPartitionFunc, dests,
mgr.tagsMap != nil && !mgr.tagsMap["feed"])
if err != nil {
return fmt.Errorf("feed_dcp: could not prepare DCP feed to server: %s,"+
" bucketName: %s, indexName: %s, err: %v",
mgr.server, bucketName, indexName, err)
}
err = feed.Start()
if err != nil {
return fmt.Errorf("feed_dcp: could not start, server: %s, err: %v",
mgr.server, err)
}
err = mgr.registerFeed(feed)
if err != nil {
feed.Close()
return err
}
return nil
}
// A DCPFeed implements both Feed and cbdatasource.Receiver
// interfaces, and forwards any incoming cbdatasource.Receiver
// callbacks to the relevant, hooked-up Dest instances.
type DCPFeed struct {
name string
indexName string
url string
poolName string
bucketName string
bucketUUID string
params *DCPFeedParams
pf DestPartitionFunc
dests map[string]Dest
disable bool
bds cbdatasource.BucketDataSource
m sync.Mutex
closed bool
lastErr error
stats *DestStats
}
// DCPFeedParams are DCP data-source/feed specific connection
// parameters that may be part of a sourceParams JSON and is a
// superset of CBFeedParams. DCPFeedParams holds the information used
// to populate a cbdatasource.BucketDataSourceOptions on calls to
// cbdatasource.NewBucketDataSource(). DCPFeedParams also implements
// the couchbase.AuthHandler interface.
type DCPFeedParams struct {
AuthUser string `json:"authUser"` // May be "" for no auth.
AuthPassword string `json:"authPassword"`
// Factor (like 1.5) to increase sleep time between retries
// in connecting to a cluster manager node.
ClusterManagerBackoffFactor float32 `json:"clusterManagerBackoffFactor"`
// Initial sleep time (millisecs) before first retry to cluster manager.
ClusterManagerSleepInitMS int `json:"clusterManagerSleepInitMS"`
// Maximum sleep time (millisecs) between retries to cluster manager.
ClusterManagerSleepMaxMS int `json:"clusterManagerSleepMaxMS"`
// Factor (like 1.5) to increase sleep time between retries
// in connecting to a data manager node.
DataManagerBackoffFactor float32 `json:"dataManagerBackoffFactor"`
// Initial sleep time (millisecs) before first retry to data manager.
DataManagerSleepInitMS int `json:"dataManagerSleepInitMS"`
// Maximum sleep time (millisecs) between retries to data manager.
DataManagerSleepMaxMS int `json:"dataManagerSleepMaxMS"`
// Buffer size in bytes provided for UPR flow control.
FeedBufferSizeBytes uint32 `json:"feedBufferSizeBytes"`
// Used for UPR flow control and buffer-ack messages when this
// percentage of FeedBufferSizeBytes is reached.
FeedBufferAckThreshold float32 `json:"feedBufferAckThreshold"`
}
// NewDCPFeedParams returns a DCPFeedParams initialized with default
// values.
func NewDCPFeedParams() *DCPFeedParams {
return &DCPFeedParams{
ClusterManagerSleepMaxMS: 20000,
DataManagerSleepMaxMS: 20000,
}
}
// GetCredentials is part of the couchbase.AuthHandler interface.
func (d *DCPFeedParams) GetCredentials() (string, string, string) {
// TODO: bucketName not necessarily userName.
return d.AuthUser, d.AuthPassword, d.AuthUser
}
// NewDCPFeed creates a new, ready-to-be-started DCP feed.
func NewDCPFeed(name, indexName, url, poolName,
bucketName, bucketUUID, paramsStr string,
pf DestPartitionFunc, dests map[string]Dest,
disable bool) (*DCPFeed, error) {
params := NewDCPFeedParams()
if paramsStr != "" {
err := json.Unmarshal([]byte(paramsStr), params)
if err != nil {
return nil, err
}
}
vbucketIds, err := ParsePartitionsToVBucketIds(dests)
if err != nil {
return nil, err
}
if len(vbucketIds) <= 0 {
vbucketIds = nil
}
var auth couchbase.AuthHandler
if params.AuthUser != "" {
auth = params
}
options := &cbdatasource.BucketDataSourceOptions{
Name: fmt.Sprintf("%s-%x", name, rand.Int31()),
ClusterManagerBackoffFactor: params.ClusterManagerBackoffFactor,
ClusterManagerSleepInitMS: params.ClusterManagerSleepInitMS,
ClusterManagerSleepMaxMS: params.ClusterManagerSleepMaxMS,
DataManagerBackoffFactor: params.DataManagerBackoffFactor,
DataManagerSleepInitMS: params.DataManagerSleepInitMS,
DataManagerSleepMaxMS: params.DataManagerSleepMaxMS,
FeedBufferSizeBytes: params.FeedBufferSizeBytes,
FeedBufferAckThreshold: params.FeedBufferAckThreshold,
}
feed := &DCPFeed{
name: name,
indexName: indexName,
url: url,
poolName: poolName,
bucketName: bucketName,
bucketUUID: bucketUUID,
params: params,
pf: pf,
dests: dests,
disable: disable,
stats: NewDestStats(),
}
feed.bds, err = cbdatasource.NewBucketDataSource(
strings.Split(url, ";"),
poolName, bucketName, bucketUUID,
vbucketIds, auth, feed, options)
if err != nil {
return nil, err
}
return feed, nil
}
func (t *DCPFeed) Name() string {
return t.name
}
func (t *DCPFeed) IndexName() string {
return t.indexName
}
func (t *DCPFeed) Start() error {
if t.disable {
log.Printf("feed_dcp: disable, name: %s", t.Name())
return nil
}
log.Printf("feed_dcp: start, name: %s", t.Name())
return t.bds.Start()
}
func (t *DCPFeed) Close() error {
t.m.Lock()
if t.closed {
t.m.Unlock()
return nil
}
t.closed = true
t.m.Unlock()
log.Printf("feed_dcp: close, name: %s", t.Name())
return t.bds.Close()
}
func (t *DCPFeed) Dests() map[string]Dest {
return t.dests
}
var prefixBucketDataSourceStats = []byte(`{"bucketDataSourceStats":`)
var prefixDestStats = []byte(`,"destStats":`)
func (t *DCPFeed) Stats(w io.Writer) error {
bdss := cbdatasource.BucketDataSourceStats{}
err := t.bds.Stats(&bdss)
if err != nil {
return err
}
w.Write(prefixBucketDataSourceStats)
json.NewEncoder(w).Encode(&bdss)
w.Write(prefixDestStats)
t.stats.WriteJSON(w)
_, err = w.Write(jsonCloseBrace)
return err
}
// --------------------------------------------------------
func (r *DCPFeed) OnError(err error) {
// TODO: Check the type of the error if it's something
// serious / not-recoverable / needs user attention.
log.Printf("feed_dcp: OnError, name: %s:"+
" bucketName: %s, bucketUUID: %s, err: %v\n",
r.name, r.bucketName, r.bucketUUID, err)
atomic.AddUint64(&r.stats.TotError, 1)
r.m.Lock()
r.lastErr = err
r.m.Unlock()
}
func (r *DCPFeed) DataUpdate(vbucketId uint16, key []byte, seq uint64,
req *gomemcached.MCRequest) error {
return Timer(func() error {
partition, dest, err :=
VBucketIdToPartitionDest(r.pf, r.dests, vbucketId, key)
if err != nil {
return err
}
err = dest.DataUpdate(partition, key, seq, req.Body,
req.Cas, DEST_EXTRAS_TYPE_DCP, req.Extras)
if err != nil {
return fmt.Errorf("feed_dcp: DataUpdate,"+
" name: %s, partition: %s, key: %s, seq: %d, err: %v",
r.name, partition, key, seq, err)
}
return nil
}, r.stats.TimerDataUpdate)
}
func (r *DCPFeed) DataDelete(vbucketId uint16, key []byte, seq uint64,
req *gomemcached.MCRequest) error {
return Timer(func() error {
partition, dest, err :=
VBucketIdToPartitionDest(r.pf, r.dests, vbucketId, key)
if err != nil {
return err
}
err = dest.DataDelete(partition, key, seq,
req.Cas, DEST_EXTRAS_TYPE_DCP, req.Extras)
if err != nil {
return fmt.Errorf("feed_dcp: DataDelete,"+
" name: %s, partition: %s, key: %s, seq: %d, err: %v",
r.name, partition, key, seq, err)
}
return nil
}, r.stats.TimerDataDelete)
}
func (r *DCPFeed) SnapshotStart(vbucketId uint16,
snapStart, snapEnd uint64, snapType uint32) error {
return Timer(func() error {
partition, dest, err :=
VBucketIdToPartitionDest(r.pf, r.dests, vbucketId, nil)
if err != nil {
return err
}
return dest.SnapshotStart(partition, snapStart, snapEnd)
}, r.stats.TimerSnapshotStart)
}
func (r *DCPFeed) SetMetaData(vbucketId uint16, value []byte) error {
return Timer(func() error {
partition, dest, err :=
VBucketIdToPartitionDest(r.pf, r.dests, vbucketId, nil)
if err != nil {
return err
}
return dest.OpaqueSet(partition, value)
}, r.stats.TimerOpaqueSet)
}
func (r *DCPFeed) GetMetaData(vbucketId uint16) (
value []byte, lastSeq uint64, err error) {
err = Timer(func() error {
partition, dest, err :=
VBucketIdToPartitionDest(r.pf, r.dests, vbucketId, nil)
if err != nil {
return err
}
value, lastSeq, err = dest.OpaqueGet(partition)
return err
}, r.stats.TimerOpaqueGet)
return value, lastSeq, err
}
func (r *DCPFeed) Rollback(vbucketId uint16, rollbackSeq uint64) error {
return Timer(func() error {
partition, dest, err :=
VBucketIdToPartitionDest(r.pf, r.dests, vbucketId, nil)
if err != nil {
return err
}
opaqueValue, lastSeq, err := dest.OpaqueGet(partition)
if err != nil {
return err
}
log.Printf("feed_dcp: rollback, name: %s: vbucketId: %d,"+
" rollbackSeq: %d, partition: %s, opaqueValue: %s, lastSeq: %d",
r.name, vbucketId, rollbackSeq,
partition, opaqueValue, lastSeq)
return dest.Rollback(partition, rollbackSeq)
}, r.stats.TimerRollback)
}
// -------------------------------------------------------
type vbucketMetaData struct {
FailOverLog [][]uint64 `json:"failOverLog"`
}
func parseOpaqueToUUID(b []byte) string {
vmd := &vbucketMetaData{}
err := json.Unmarshal(b, &vmd)
if err != nil {
return ""
}
flogLen := len(vmd.FailOverLog)
if flogLen < 1 || len(vmd.FailOverLog[flogLen-1]) < 1 {
return ""
}
return fmt.Sprintf("%d", vmd.FailOverLog[flogLen-1][0])
}