Do reconnect to RabbitMQ

https://github.com/google/go-cloud/issues/2958
https://github.com/chrislusf/seaweedfs/issues/1773

weed/filer/filer_notify.go

@@ -55,7 +55,10 @@ func (f *Filer) NotifyUpdateEvent(ctx context.Context, oldEntry, newEntry *Entry
 
 	if notification.Queue != nil {
 		glog.V(3).Infof("notifying entry update %v", fullpath)
-		notification.Queue.SendMessage(fullpath, eventNotification)
+		if err := notification.Queue.SendMessage(fullpath, eventNotification); err != nil {
+			// throw message
+			glog.Error(err)
+		}
 	}
 
 	f.logMetaEvent(ctx, fullpath, eventNotification)

weed/notification/gocdk_pub_sub/gocdk_pub_sub.go

@@ -17,10 +17,14 @@ package gocdk_pub_sub
 import (
 	"context"
 	"fmt"
-
 	"github.com/golang/protobuf/proto"
+	"github.com/streadway/amqp"
 	"gocloud.dev/pubsub"
 	_ "gocloud.dev/pubsub/awssnssqs"
+	"gocloud.dev/pubsub/rabbitpubsub"
+	"net/url"
+	"path"
+	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/notification"
@@ -29,12 +33,18 @@ import (
 	_ "gocloud.dev/pubsub/gcppubsub"
 	_ "gocloud.dev/pubsub/natspubsub"
 	_ "gocloud.dev/pubsub/rabbitpubsub"
+	"os"
 )
 
 func init() {
 	notification.MessageQueues = append(notification.MessageQueues, &GoCDKPubSub{})
 }
 
+func getPath(rawUrl string) string {
+	parsedUrl, _ := url.Parse(rawUrl)
+	return path.Join(parsedUrl.Host, parsedUrl.Path)
+}
+
 type GoCDKPubSub struct {
 	topicURL string
 	topic    *pubsub.Topic
@@ -44,6 +54,28 @@ func (k *GoCDKPubSub) GetName() string {
 	return "gocdk_pub_sub"
 }
 
+func (k *GoCDKPubSub) doReconnect() {
+	var conn *amqp.Connection
+	if k.topic.As(&conn) {
+		go func() {
+			<-conn.NotifyClose(make(chan *amqp.Error))
+			conn.Close()
+			k.topic.Shutdown(context.Background())
+			for {
+				glog.Info("Try reconnect")
+				conn, err := amqp.Dial(os.Getenv("RABBIT_SERVER_URL"))
+				if err == nil {
+					k.topic = rabbitpubsub.OpenTopic(conn, getPath(k.topicURL), nil)
+					k.doReconnect()
+					break
+				}
+				glog.Error(err)
+				time.Sleep(time.Second)
+			}
+		}()
+	}
+}
+
 func (k *GoCDKPubSub) Initialize(configuration util.Configuration, prefix string) error {
 	k.topicURL = configuration.GetString(prefix + "topic_url")
 	glog.V(0).Infof("notification.gocdk_pub_sub.topic_url: %v", k.topicURL)
@@ -52,6 +84,7 @@ func (k *GoCDKPubSub) Initialize(configuration util.Configuration, prefix string
 		glog.Fatalf("Failed to open topic: %v", err)
 	}
 	k.topic = topic
+	k.doReconnect()
 	return nil
 }
 

weed/replication/sub/notification_gocdk_pub_sub.go

@@ -9,9 +9,12 @@ import (
 	"github.com/streadway/amqp"
 	"gocloud.dev/pubsub"
 	_ "gocloud.dev/pubsub/awssnssqs"
+	"gocloud.dev/pubsub/rabbitpubsub"
 	"net/url"
+	"os"
 	"path"
 	"strings"
+	"time"
 
 	// _ "gocloud.dev/pubsub/azuresb"
 	_ "gocloud.dev/pubsub/gcppubsub"
@@ -74,6 +77,7 @@ func QueueDeclareAndBind(conn *amqp.Connection, exchangeUrl string, queueUrl str
 
 type GoCDKPubSubInput struct {
 	sub    *pubsub.Subscription
+	subURL string
 }
 
 func (k *GoCDKPubSubInput) GetName() string {
@@ -82,9 +86,9 @@ func (k *GoCDKPubSubInput) GetName() string {
 
 func (k *GoCDKPubSubInput) Initialize(configuration util.Configuration, prefix string) error {
 	topicUrl := configuration.GetString(prefix + "topic_url")
-	subURL := configuration.GetString(prefix + "sub_url")
-	glog.V(0).Infof("notification.gocdk_pub_sub.sub_url: %v", subURL)
-	sub, err := pubsub.OpenSubscription(context.Background(), subURL)
+	k.subURL = configuration.GetString(prefix + "sub_url")
+	glog.V(0).Infof("notification.gocdk_pub_sub.sub_url: %v", k.subURL)
+	sub, err := pubsub.OpenSubscription(context.Background(), k.subURL)
 	if err != nil {
 		return err
 	}
@@ -95,10 +99,10 @@ func (k *GoCDKPubSubInput) Initialize(configuration util.Configuration, prefix s
 			return err
 		}
 		defer ch.Close()
-		_, err = ch.QueueInspect(getPath(subURL))
+		_, err = ch.QueueInspect(getPath(k.subURL))
 		if err != nil {
 			if strings.HasPrefix(err.Error(), "Exception (404) Reason") {
-				if err := QueueDeclareAndBind(conn, topicUrl, subURL); err != nil {
+				if err := QueueDeclareAndBind(conn, topicUrl, k.subURL); err != nil {
 					return err
 				}
 			} else {
@@ -111,14 +115,25 @@ func (k *GoCDKPubSubInput) Initialize(configuration util.Configuration, prefix s
 }
 
 func (k *GoCDKPubSubInput) ReceiveMessage() (key string, message *filer_pb.EventNotification, onSuccessFn func(), onFailureFn func(), err error) {
-	msg, err := k.sub.Receive(context.Background())
+	ctx := context.Background()
+	msg, err := k.sub.Receive(ctx)
 	if err != nil {
 		var conn *amqp.Connection
 		if k.sub.As(&conn) && conn.IsClosed() {
-			glog.Fatalln(err)
+			conn.Close()
+			k.sub.Shutdown(ctx)
+			conn, err = amqp.Dial(os.Getenv("RABBIT_SERVER_URL"))
+			if err != nil {
+				glog.Error(err)
+				time.Sleep(time.Second)
+				return
 			}
+			k.sub = rabbitpubsub.OpenSubscription(conn, getPath(k.subURL), nil)
 			return
 		}
+		// This is permanent cached sub err
+		glog.Fatal(err)
+	}
 	onFailureFn = func() {
 		if msg.Nackable() {
 			isRedelivered := false