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shard_worker.go
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shard_worker.go
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package consumerLibrary
import (
"github.com/aliyun/aliyun-log-go-sdk"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"sync"
"time"
)
var shutDownLock sync.RWMutex
var consumeStatusLock sync.RWMutex
var consumerTaskLock sync.RWMutex
type ShardConsumerWorker struct {
client *ConsumerClient
consumerCheckPointTracker *ConsumerCheckPointTracker
consumerShutDownFlag bool
lastFetchLogGroupList *sls.LogGroupList
nextFetchCursor string
lastFetchGroupCount int
lastFetchtime int64
consumerStatus string
process func(shard int, logGroup *sls.LogGroupList) string
shardId int
tempCheckPoint string
isCurrentDone bool
logger log.Logger
lastFetchTimeForForceFlushCpt int64
isFlushCheckpointDone bool
rollBackCheckpoint string
}
func (consumer *ShardConsumerWorker) setConsumerStatus(status string) {
consumeStatusLock.Lock()
defer consumeStatusLock.Unlock()
consumer.consumerStatus = status
}
func (consumer *ShardConsumerWorker) getConsumerStatus() string {
consumeStatusLock.RLock()
defer consumeStatusLock.RUnlock()
return consumer.consumerStatus
}
func initShardConsumerWorker(shardId int, consumerClient *ConsumerClient, do func(shard int, logGroup *sls.LogGroupList) string, logger log.Logger) *ShardConsumerWorker {
shardConsumeWorker := &ShardConsumerWorker{
consumerShutDownFlag: false,
process: do,
consumerCheckPointTracker: initConsumerCheckpointTracker(shardId, consumerClient, logger),
client: consumerClient,
consumerStatus: INITIALIZING,
shardId: shardId,
lastFetchtime: 0,
isCurrentDone: true,
isFlushCheckpointDone: true,
logger: logger,
lastFetchTimeForForceFlushCpt: 0,
rollBackCheckpoint: "",
}
return shardConsumeWorker
}
func (consumer *ShardConsumerWorker) consume() {
if consumer.consumerShutDownFlag {
consumer.setIsFlushCheckpointDoneToFalse()
go func() {
// If the data is not consumed, save the tempCheckPoint to the server
if consumer.getConsumerStatus() == PULL_PROCESSING_DONE {
consumer.consumerCheckPointTracker.tempCheckPoint = consumer.tempCheckPoint
} else if consumer.getConsumerStatus() == CONSUME_PROCESSING {
level.Info(consumer.logger).Log("msg", "Consumption is in progress, waiting for consumption to be completed")
consumer.setIsFlushCheckpointDoneToTrue()
return
}
err := consumer.consumerCheckPointTracker.flushCheckPoint()
if err != nil {
level.Warn(consumer.logger).Log("msg", "Flush checkpoint error,prepare for retry", "error message:", err)
} else {
consumer.setConsumerStatus(SHUTDOWN_COMPLETE)
level.Info(consumer.logger).Log("msg", "shardworker are shut down complete", "shardWorkerId", consumer.shardId)
}
consumer.setIsFlushCheckpointDoneToTrue()
}()
} else if consumer.getConsumerStatus() == INITIALIZING {
consumer.setConsumerIsCurrentDoneToFalse()
go func() {
cursor, err := consumer.consumerInitializeTask()
if err != nil {
consumer.setConsumerStatus(INITIALIZING)
} else {
consumer.nextFetchCursor = cursor
consumer.setConsumerStatus(INITIALIZING_DONE)
}
consumer.setConsumerIsCurrentDoneToTrue()
}()
} else if consumer.getConsumerStatus() == INITIALIZING_DONE || consumer.getConsumerStatus() == CONSUME_PROCESSING_DONE {
consumer.setConsumerIsCurrentDoneToFalse()
consumer.setConsumerStatus(PULL_PROCESSING)
go func() {
var isGenerateFetchTask = true
// throttling control, similar as Java's SDK
if consumer.lastFetchGroupCount < 100 {
// The time used here is in milliseconds.
isGenerateFetchTask = (time.Now().UnixNano()/1e6 - consumer.lastFetchtime) > 500
} else if consumer.lastFetchGroupCount < 500 {
isGenerateFetchTask = (time.Now().UnixNano()/1e6 - consumer.lastFetchtime) > 200
} else if consumer.lastFetchGroupCount < 1000 {
isGenerateFetchTask = (time.Now().UnixNano()/1e6 - consumer.lastFetchtime) > 50
}
if isGenerateFetchTask {
consumer.lastFetchtime = time.Now().UnixNano() / 1e6
// Set the logback cursor. If the logs are not consumed, save the logback cursor to the server.
consumer.tempCheckPoint = consumer.nextFetchCursor
logGroupList, nextCursor, err := consumer.consumerFetchTask()
if err != nil {
consumer.setConsumerStatus(INITIALIZING_DONE)
} else {
consumer.lastFetchLogGroupList = logGroupList
consumer.nextFetchCursor = nextCursor
consumer.consumerCheckPointTracker.setMemoryCheckPoint(consumer.nextFetchCursor)
consumer.lastFetchGroupCount = GetLogGroupCount(consumer.lastFetchLogGroupList)
level.Debug(consumer.logger).Log("shardId", consumer.shardId, "fetch log count", GetLogCount(consumer.lastFetchLogGroupList))
if consumer.lastFetchGroupCount == 0 {
consumer.lastFetchLogGroupList = nil
} else {
consumer.lastFetchTimeForForceFlushCpt = time.Now().Unix()
}
if consumer.lastFetchTimeForForceFlushCpt != 0 && time.Now().Unix()-consumer.lastFetchTimeForForceFlushCpt > 30 {
err := consumer.consumerCheckPointTracker.flushCheckPoint()
if err != nil {
level.Warn(consumer.logger).Log("msg", "Failed to save the final checkpoint", "error:", err)
} else {
consumer.lastFetchTimeForForceFlushCpt = 0
}
}
consumer.setConsumerStatus(PULL_PROCESSING_DONE)
}
} else {
level.Debug(consumer.logger).Log("msg", "Pull Log Current Limitation and Re-Pull Log")
consumer.setConsumerStatus(INITIALIZING_DONE)
}
consumer.setConsumerIsCurrentDoneToTrue()
}()
} else if consumer.getConsumerStatus() == PULL_PROCESSING_DONE {
consumer.setConsumerIsCurrentDoneToFalse()
consumer.setConsumerStatus(CONSUME_PROCESSING)
go func() {
rollBackCheckpoint := consumer.consumerProcessTask()
if rollBackCheckpoint != "" {
consumer.nextFetchCursor = rollBackCheckpoint
level.Info(consumer.logger).Log("msg", "Checkpoints set for users have been reset", "shardWorkerId", consumer.shardId, "rollBackCheckpoint", rollBackCheckpoint)
}
consumer.lastFetchLogGroupList = nil
consumer.setConsumerStatus(CONSUME_PROCESSING_DONE)
consumer.setConsumerIsCurrentDoneToTrue()
}()
}
}
func (consumer *ShardConsumerWorker) consumerShutDown() {
consumer.consumerShutDownFlag = true
if !consumer.isShutDownComplete() {
if consumer.getIsFlushCheckpointDoneStatus() == true {
consumer.consume()
} else {
return
}
}
}
func (consumer *ShardConsumerWorker) isShutDownComplete() bool {
return consumer.getConsumerStatus() == SHUTDOWN_COMPLETE
}
func (consumer *ShardConsumerWorker) setConsumerIsCurrentDoneToFalse() {
consumerTaskLock.Lock()
defer consumerTaskLock.Unlock()
consumer.isCurrentDone = false
}
func (consumer *ShardConsumerWorker) setConsumerIsCurrentDoneToTrue() {
consumerTaskLock.Lock()
defer consumerTaskLock.Unlock()
consumer.isCurrentDone = true
}
func (consumer *ShardConsumerWorker) getConsumerIsCurrentDoneStatus() bool {
consumerTaskLock.RLock()
defer consumerTaskLock.RUnlock()
return consumer.isCurrentDone
}
func (consumer *ShardConsumerWorker) setIsFlushCheckpointDoneToFalse() {
shutDownLock.Lock()
defer shutDownLock.Unlock()
consumer.isFlushCheckpointDone = false
}
func (consumer *ShardConsumerWorker) setIsFlushCheckpointDoneToTrue() {
shutDownLock.Lock()
defer shutDownLock.Unlock()
consumer.isFlushCheckpointDone = true
}
func (consumer *ShardConsumerWorker) getIsFlushCheckpointDoneStatus() bool {
shutDownLock.RLock()
defer shutDownLock.RUnlock()
return consumer.isFlushCheckpointDone
}