handle notifyClose

Author: akshar

datafeed/mq.go

@@ -17,6 +17,10 @@ const (
 	mqConsumerConcurrency = 1
 )
 
+const (
+	consumerRetries = 10
+)
+
 // MQService
 type MQService struct {
 	logger          hclog.Logger
@@ -61,6 +65,19 @@ func newMQService(logger hclog.Logger, config *MQConfig, datafeedService *DataFe
 	return mq, nil
 }
 
+func (mq *MQService) restartWithRetries(ctx context.Context) (<-chan *proto.DataFeedReport, <-chan error, error) {
+	for i := 0; i < consumerRetries; i++ {
+		mq.logger.Debug("Restarting consumer with try", i)
+		time.Sleep(5 * time.Second)
+		reports, errors, err := mq.startConsumer(ctx, mqConsumerConcurrency)
+		if err == nil {
+			return reports, errors, err
+		}
+	}
+
+	return nil, nil, fmt.Errorf("failed to restart consumer after %d retries", consumerRetries)
+}
+
 // startConsumeLoop
 func (mq *MQService) startConsumeLoop() {
 	mq.logger.Debug("listening for MQ messages...")
@@ -80,19 +97,15 @@ func (mq *MQService) startConsumeLoop() {
 			mq.datafeedService.queueReportingTx(ProposeOutcome, report.MarketHash, report.Outcome)
 		case err = <-errors:
 			mq.logger.Error("error while consuming from message queue", "err", err)
-			mq.logger.Debug("Restarting consumer...")
-			time.Sleep(2 * time.Second)
-			reports, errors, err = mq.startConsumer(ctx, mqConsumerConcurrency)
+			reports, errors, err = mq.restartWithRetries(ctx)
 			if err != nil {
-				mq.logger.Error("Got Error during consumer restart", err)
+				mq.logger.Error("failed to start consumer - errors chan", err)
 			}
 		case <-common.GetTerminationSignalCh():
 			mq.logger.Debug("got sigterm, shuttown down mq consumer")
-			mq.logger.Debug("Restarting consumer...")
-			time.Sleep(2 * time.Second)
-			reports, errors, err = mq.startConsumer(ctx, mqConsumerConcurrency)
+			reports, errors, err = mq.restartWithRetries(ctx)
 			if err != nil {
-				mq.logger.Error("Got Error during consumer restart", err)
+				mq.logger.Error("failed to start consumer - sigterm", err)
 			}
 
 		}
@@ -175,6 +188,14 @@ func (mq *MQService) startConsumer(
 		}()
 	}
 
+	go func() {
+		notifyCloseError := <-mq.connection.Channel.NotifyClose(make(chan *amqp.Error))
+		if notifyCloseError != nil {
+			mq.logger.Debug("Got notifyCloseError error")
+			errors <- fmt.Errorf("Connection closed: %v", notifyCloseError)
+		}
+	}()
+
 	// stop the consumer upon sigterm
 	go func() {
 		<-ctx.Done()