fix(poller): graceful shutdown

poller/poller.go

@@ -12,11 +12,6 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
-const (
-	errorRetryCounterLimit  = 3
-	errorRetryTimeSleepSecs = 30
-)
-
 var ErrDataLock = errors.New("Data Lock Error")
 
 func New(cli client.Client, dispatch func(context.Context, *runnerv1.Task) error) *Poller {
@@ -33,9 +28,8 @@ type Poller struct {
 	Filter   *client.Filter
 	Dispatch func(context.Context, *runnerv1.Task) error
 
-	routineGroup      *routineGroup
-	metric            *metric
-	errorRetryCounter int
+	routineGroup *routineGroup
+	metric       *metric
 }
 
 func (p *Poller) Wait() {
@@ -59,10 +53,10 @@ func (p *Poller) Poll(ctx context.Context, n int) error {
 						if err := p.poll(ctx, i+1); err != nil {
 							log.WithField("thread", i+1).
 								WithError(err).Error("poll error")
-							if p.errorRetryCounter > errorRetryCounterLimit {
-								log.WithField("thread", i+1).Error("poller: too many errors, sleeping for 30 seconds")
-								// FIXME: it makes ctrl+c hang up
-								time.Sleep(time.Second * errorRetryTimeSleepSecs)
+							select {
+							case <-ctx.Done():
+								return
+							case <-time.After(5 * time.Second):
 							}
 						}
 					}
@@ -86,19 +80,16 @@ func (p *Poller) poll(ctx context.Context, thread int) error {
 	resp, err := p.Client.FetchTask(reqCtx, connect.NewRequest(&runnerv1.FetchTaskRequest{}))
 	if err == context.Canceled || err == context.DeadlineExceeded {
 		l.WithError(err).Trace("poller: no stage returned")
-		p.errorRetryCounter++
 		return nil
 	}
 
 	if err != nil && err == ErrDataLock {
 		l.WithError(err).Info("task accepted by another runner")
-		p.errorRetryCounter++
 		return nil
 	}
 
 	if err != nil {
 		l.WithError(err).Error("cannot accept task")
-		p.errorRetryCounter++
 		return err
 	}
 
@@ -108,8 +99,6 @@ func (p *Poller) poll(ctx context.Context, thread int) error {
 		return nil
 	}
 
-	p.errorRetryCounter = 0
-
 	runCtx, cancel := context.WithTimeout(ctx, time.Hour)
 	defer cancel()