forked from couchbase/go-couchbase
/
main.go
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/
main.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 main
import (
"encoding/json"
"flag"
"fmt"
"log"
"os"
"os/signal"
"reflect"
"runtime"
"runtime/pprof"
"strconv"
"strings"
"sync"
"time"
"github.com/couchbase/go-couchbase"
"github.com/couchbase/go-couchbase/cbdatasource"
"github.com/couchbase/gomemcached"
)
// Simple, memory-only sample program that uses the cbdatasource API's
// to get data from a couchbase cluster using DCP.
var verbose = flag.Int("verbose", 1,
"verbose'ness of logging, where 0 is no logging")
var serverURL = flag.String("serverURL", "http://localhost:8091",
"couchbase server URL")
var poolName = flag.String("poolName", "default",
"pool name")
var bucketName = flag.String("bucketName", "default",
"bucket name")
var bucketUUID = flag.String("bucketUUID", "",
"bucket UUID")
var vbucketIds = flag.String("vbucketIds", "",
"comma separated vbucket id numbers; defaults to all vbucket id's")
var authUser = flag.String("authUser", "",
"auth user name (probably same as bucketName)")
var authPswd = flag.String("authPswd", "",
"auth password")
var optionClusterManagerBackoffFactor = flag.Float64("optionClusterManagerBackoffFactor", 1.5,
"factor to increase sleep time between retries to cluster manager")
var optionClusterManagerSleepInitMS = flag.Int("optionClusterManagerSleepInitMS", 100,
"initial sleep time for retries to cluster manager")
var optionClusterManagerSleepMaxMS = flag.Int("optionClusterManagerSleepMaxMS", 1000,
"max sleep time for retries to cluster manager")
var optionDataManagerBackoffFactor = flag.Float64("optionDataManagerBackoffFactor", 1.5,
"factor to increase sleep time between retries to data manager")
var optionDataManagerSleepInitMS = flag.Int("optionDataManagerSleepInitMS", 100,
"initial sleep time for retries to data manager")
var optionDataManagerSleepMaxMS = flag.Int("optionDataManagerSleepMaxMS", 1000,
"max sleep time for retries to data manager")
var optionFeedBufferSizeBytes = flag.Int("optionFeedBufferSizeBytes", 20000000,
"buffer size for flow control")
var optionFeedBufferAckThreshold = flag.Float64("optionFeedBufferAckThreshold", 0.2,
"percent (0-to-1.0) of buffer size before sending a flow control buffer-ack")
var bds cbdatasource.BucketDataSource
func main() {
flag.Parse()
go dumpOnSignalForPlatform()
if *verbose > 0 {
log.Printf("%s started", os.Args[0])
flag.VisitAll(func(f *flag.Flag) { log.Printf(" -%s=%s\n", f.Name, f.Value) })
log.Printf(" GOMAXPROCS=%d", runtime.GOMAXPROCS(-1))
}
serverURLs := []string{*serverURL}
vbucketIdsArr := []uint16(nil) // A nil means get all the vbuckets.
if *vbucketIds != "" {
vbucketIdsArr = []uint16{}
for _, vbucketIdStr := range strings.Split(*vbucketIds, ",") {
if vbucketIdStr != "" {
vbucketId, err := strconv.Atoi(vbucketIdStr)
if err != nil {
log.Fatalf("error: could not parse vbucketId: %s", vbucketIdStr)
}
vbucketIdsArr = append(vbucketIdsArr, uint16(vbucketId))
}
}
if len(vbucketIdsArr) <= 0 {
vbucketIdsArr = nil
}
}
if *optionFeedBufferSizeBytes < 0 {
log.Fatalf("error: optionFeedBufferSizeBytes must be >= 0")
}
options := &cbdatasource.BucketDataSourceOptions{
ClusterManagerBackoffFactor: float32(*optionClusterManagerBackoffFactor),
ClusterManagerSleepInitMS: *optionClusterManagerSleepInitMS,
ClusterManagerSleepMaxMS: *optionClusterManagerSleepMaxMS,
DataManagerBackoffFactor: float32(*optionDataManagerBackoffFactor),
DataManagerSleepInitMS: *optionDataManagerSleepInitMS,
DataManagerSleepMaxMS: *optionDataManagerSleepMaxMS,
FeedBufferSizeBytes: uint32(*optionFeedBufferSizeBytes),
FeedBufferAckThreshold: float32(*optionFeedBufferAckThreshold),
}
var auth couchbase.AuthHandler = nil
if *authUser != "" {
auth = &authUserPswd{}
}
receiver := &ExampleReceiver{}
var err error
bds, err = cbdatasource.NewBucketDataSource(serverURLs,
*poolName, *bucketName, *bucketUUID, vbucketIdsArr, auth, receiver, options)
if err != nil {
log.Fatalf(fmt.Sprintf("error: NewBucketDataSource, err: %v", err))
}
if err = bds.Start(); err != nil {
log.Fatalf(fmt.Sprintf("error: Start, err: %v", err))
}
if *verbose > 0 {
log.Printf("started bucket data source: %v", bds)
}
for {
time.Sleep(1000 * time.Millisecond)
reportStats(bds, false)
}
}
type authUserPswd struct{}
func (a authUserPswd) GetCredentials() (string, string, string) {
return *authUser, *authPswd, ""
}
// ----------------------------------------------------------------
type ExampleReceiver struct {
m sync.Mutex
seqs map[uint16]uint64 // To track max seq #'s we received per vbucketId.
meta map[uint16][]byte // To track metadata blob's per vbucketId.
}
func (r *ExampleReceiver) OnError(err error) {
if *verbose > 0 {
log.Printf("error: %v", err)
}
reportStats(bds, true)
}
func (r *ExampleReceiver) DataUpdate(vbucketId uint16, key []byte, seq uint64,
req *gomemcached.MCRequest) error {
if *verbose > 1 {
log.Printf("data-update: vbucketId: %d, key: %s, seq: %x, req: %#v",
vbucketId, key, seq, req)
}
r.updateSeq(vbucketId, seq)
return nil
}
func (r *ExampleReceiver) DataDelete(vbucketId uint16, key []byte, seq uint64,
req *gomemcached.MCRequest) error {
if *verbose > 1 {
log.Printf("data-delete: vbucketId: %d, key: %s, seq: %x, req: %#v",
vbucketId, key, seq, req)
}
r.updateSeq(vbucketId, seq)
return nil
}
func (r *ExampleReceiver) SnapshotStart(vbucketId uint16,
snapStart, snapEnd uint64, snapType uint32) error {
if *verbose > 1 {
log.Printf("snapshot-start: vbucketId: %d, snapStart: %x, snapEnd: %x, snapType: %x",
vbucketId, snapStart, snapEnd, snapType)
}
return nil
}
func (r *ExampleReceiver) SetMetaData(vbucketId uint16, value []byte) error {
if *verbose > 1 {
log.Printf("set-metadata: vbucketId: %d, value: %s", vbucketId, value)
}
r.m.Lock()
defer r.m.Unlock()
if r.meta == nil {
r.meta = make(map[uint16][]byte)
}
r.meta[vbucketId] = value
return nil
}
func (r *ExampleReceiver) GetMetaData(vbucketId uint16) (
value []byte, lastSeq uint64, err error) {
if *verbose > 1 {
log.Printf("get-metadata: vbucketId: %d", vbucketId)
}
r.m.Lock()
defer r.m.Unlock()
value = []byte(nil)
if r.meta != nil {
value = r.meta[vbucketId]
}
if r.seqs != nil {
lastSeq = r.seqs[vbucketId]
}
return value, lastSeq, nil
}
func (r *ExampleReceiver) Rollback(vbucketId uint16, rollbackSeq uint64) error {
if *verbose > 0 {
log.Printf("rollback: vbucketId: %d, rollbackSeq: %x", vbucketId, rollbackSeq)
}
return fmt.Errorf("unimpl-rollback")
}
// ----------------------------------------------------------------
func (r *ExampleReceiver) updateSeq(vbucketId uint16, seq uint64) {
r.m.Lock()
defer r.m.Unlock()
if r.seqs == nil {
r.seqs = make(map[uint16]uint64)
}
if r.seqs[vbucketId] < seq {
r.seqs[vbucketId] = seq // Remember the max seq for GetMetaData().
}
}
// ----------------------------------------------------------------
var mutexStats sync.Mutex
var lastStats = &cbdatasource.BucketDataSourceStats{}
var currStats = &cbdatasource.BucketDataSourceStats{}
func reportStats(b cbdatasource.BucketDataSource, force bool) {
if *verbose <= 0 {
return
}
mutexStats.Lock()
defer mutexStats.Unlock()
b.Stats(currStats)
if force || !reflect.DeepEqual(lastStats, currStats) {
buf, err := json.Marshal(currStats)
if err == nil {
log.Printf("%s", string(buf))
}
lastStats, currStats = currStats, lastStats
}
}
func dumpOnSignal(signals ...os.Signal) {
c := make(chan os.Signal, 1)
signal.Notify(c, signals...)
for _ = range c {
reportStats(bds, true)
log.Printf("dump: goroutine...")
pprof.Lookup("goroutine").WriteTo(os.Stderr, 1)
log.Printf("dump: heap...")
pprof.Lookup("heap").WriteTo(os.Stderr, 1)
}
}