bug(zmq): fix close zmq problem

plugins/sources/zmq.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"github.com/emqx/kuiper/xstream/api"
@@ -11,6 +12,7 @@ type zmqSource struct {
 	subscriber *zmq.Socket
 	srv        string
 	topic      string
+	cancel     context.CancelFunc
 }
 
 func (s *zmqSource) Configure(topic string, props map[string]interface{}) error {
@@ -35,7 +37,9 @@ func (s *zmqSource) Open(ctx api.StreamContext, consume api.ConsumeFunc) (err er
 	}
 	s.subscriber.SetSubscribe(s.topic)
 	logger.Debugf("zmq source subscribe to topic %s", s.topic)
-	go func() {
+	exeCtx, cancel := ctx.WithCancel()
+	s.cancel = cancel
+	go func(exeCtx api.StreamContext) {
 		logger.Debugf("start to listen")
 		for {
 			msgs, err := s.subscriber.RecvMessage(0)
@@ -63,20 +67,23 @@ func (s *zmqSource) Open(ctx api.StreamContext, consume api.ConsumeFunc) (err er
 				}
 			}
 			select {
-			case <-ctx.Done():
+			case <-exeCtx.Done():
 				logger.Infof("zmq source done")
+				if s.subscriber != nil {
+					s.subscriber.Close()
+				}
 				return
 			default:
 				//do nothing
 			}
 		}
-	}()
+	}(exeCtx)
 	return nil
 }
 
 func (s *zmqSource) Close(ctx api.StreamContext) error {
-	if s.subscriber != nil {
-		return s.subscriber.Close()
+	if s.cancel != nil {
+		s.cancel()
 	}
 	return nil
 }