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async_worker.go
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async_worker.go
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package lb
import (
"time"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/common/op"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/libbeat/outputs"
"github.com/elastic/beats/libbeat/outputs/mode"
)
type asyncWorkerFactory struct {
clients []mode.AsyncProtocolClient
waitRetry, maxWaitRetry time.Duration
}
// asyncWorker instances handle one load-balanced output per instance. Workers receive
// messages from context and return failed send attempts back to the context.
// Client connection state is fully handled by the worker.
type asyncWorker struct {
id int
client mode.AsyncProtocolClient
backoff *common.Backoff
ctx context
}
func AsyncClients(
clients []mode.AsyncProtocolClient,
waitRetry, maxWaitRetry time.Duration,
) WorkerFactory {
return &asyncWorkerFactory{
clients: clients,
waitRetry: waitRetry,
maxWaitRetry: maxWaitRetry,
}
}
func (s *asyncWorkerFactory) count() int { return len(s.clients) }
func (s *asyncWorkerFactory) mk(ctx context) ([]worker, error) {
workers := make([]worker, len(s.clients))
for i, client := range s.clients {
workers[i] = newAsyncWorker(i, client, ctx, s.waitRetry, s.maxWaitRetry)
}
return workers, nil
}
func newAsyncWorker(
id int,
client mode.AsyncProtocolClient,
ctx context,
waitRetry, maxWaitRetry time.Duration,
) *asyncWorker {
return &asyncWorker{
id: id,
client: client,
backoff: common.NewBackoff(ctx.done, waitRetry, maxWaitRetry),
ctx: ctx,
}
}
func (w *asyncWorker) run() {
client := w.client
debugf("load balancer: start client loop")
defer debugf("load balancer: stop client loop")
done := false
for !done {
if done = w.connect(); !done {
done = w.sendLoop()
debugf("close client (done=%v)", done)
client.Close()
}
}
}
func (w *asyncWorker) connect() bool {
for {
err := w.client.Connect(w.ctx.timeout)
if err == nil {
w.backoff.Reset()
return false
}
logp.Err("Connect failed with: %v", err)
cont := w.backoff.Wait()
if !cont {
return true
}
}
}
func (w *asyncWorker) sendLoop() (done bool) {
for {
msg, ok := w.ctx.receive()
if !ok {
return true
}
msg.worker = w.id
err := w.onMessage(msg)
done = !w.backoff.WaitOnError(err)
if done || err != nil {
return done
}
}
}
func (w *asyncWorker) onMessage(msg eventsMessage) error {
var err error
if msg.datum.Event != nil {
err = w.client.AsyncPublishEvent(w.handleResult(msg), msg.datum)
} else {
err = w.client.AsyncPublishEvents(w.handleResults(msg), msg.data)
}
if err != nil {
if msg.attemptsLeft > 0 {
msg.attemptsLeft--
}
// asynchronously retry to insert message (if attempts left), so worker can not
// deadlock on retries channel if client puts multiple failed outstanding
// events into the pipeline
w.onFail(msg, err)
}
return err
}
func (w *asyncWorker) handleResult(msg eventsMessage) func(error) {
return func(err error) {
if err != nil {
if msg.attemptsLeft > 0 {
msg.attemptsLeft--
}
w.onFail(msg, err)
return
}
op.SigCompleted(msg.signaler)
}
}
func (w *asyncWorker) handleResults(msg eventsMessage) func([]outputs.Data, error) {
total := len(msg.data)
return func(data []outputs.Data, err error) {
debugf("handleResults")
if err != nil {
debugf("handle publish error: %v", err)
if msg.attemptsLeft > 0 {
msg.attemptsLeft--
}
// reset attempt count if subset of messages has been processed
if len(data) < total && msg.attemptsLeft >= 0 {
msg.attemptsLeft = w.ctx.maxAttempts
}
if err != mode.ErrTempBulkFailure {
// retry non-published subset of events in batch
msg.data = data
w.onFail(msg, err)
return
}
if w.ctx.maxAttempts > 0 && msg.attemptsLeft == 0 {
// no more attempts left => drop
dropping(msg)
return
}
// retry non-published subset of events in batch
msg.data = data
w.onFail(msg, err)
return
}
// re-insert non-published events into pipeline
if len(data) != 0 {
go func() {
debugf("add non-published events back into pipeline: %v", len(data))
msg.data = data
w.ctx.pushFailed(msg)
}()
return
}
// all events published -> signal success
debugf("async bulk publish success")
op.SigCompleted(msg.signaler)
}
}
func (w *asyncWorker) onFail(msg eventsMessage, err error) {
if !w.ctx.tryPushFailed(msg) {
// break possible deadlock by spawning go-routine returning failed messages
// into retries queue
go func() {
logp.Info("Error publishing events (retrying): %s", err)
w.ctx.pushFailed(msg)
}()
}
}