From d693e7741852db9f77b542d9e07a3a6620448a83 Mon Sep 17 00:00:00 2001
From: Chris Lu <chris.lu@gmail.com>
Date: Sat, 9 May 2020 00:43:53 -0700
Subject: [PATCH] add pub sub md5

---
 weed/messaging/broker/broker_grpc_server.go |  2 +-
 weed/messaging/msgclient/pub_chan.go        | 14 +++++++++++++-
 weed/messaging/msgclient/sub_chan.go        | 17 +++++++++++++----
 3 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/weed/messaging/broker/broker_grpc_server.go b/weed/messaging/broker/broker_grpc_server.go
index 305213622..6918a28a6 100644
--- a/weed/messaging/broker/broker_grpc_server.go
+++ b/weed/messaging/broker/broker_grpc_server.go
@@ -33,5 +33,5 @@ func genTopicDir(namespace, topic string) string {
 }
 
 func genTopicDirEntry(namespace, topic string) (dir, entry string) {
-	return fmt.Sprintf("%s/%s/%s", filer2.TopicsDir, namespace), topic
+	return fmt.Sprintf("%s/%s", filer2.TopicsDir, namespace), topic
 }
diff --git a/weed/messaging/msgclient/pub_chan.go b/weed/messaging/msgclient/pub_chan.go
index ccf301a6a..9bc88f7c0 100644
--- a/weed/messaging/msgclient/pub_chan.go
+++ b/weed/messaging/msgclient/pub_chan.go
@@ -1,6 +1,8 @@
 package msgclient
 
 import (
+	"crypto/md5"
+	"hash"
 	"io"
 	"log"
 
@@ -13,6 +15,7 @@ import (
 type PubChannel struct {
 	client         messaging_pb.SeaweedMessaging_PublishClient
 	grpcConnection *grpc.ClientConn
+	md5hash        hash.Hash
 }
 
 func (mc *MessagingClient) NewPubChannel(chanName string) (*PubChannel, error) {
@@ -32,15 +35,20 @@ func (mc *MessagingClient) NewPubChannel(chanName string) (*PubChannel, error) {
 	return &PubChannel{
 		client:         pc,
 		grpcConnection: grpcConnection,
+		md5hash:        md5.New(),
 	}, nil
 }
 
 func (pc *PubChannel) Publish(m []byte) error {
-	return pc.client.Send(&messaging_pb.PublishRequest{
+	err := pc.client.Send(&messaging_pb.PublishRequest{
 		Data: &messaging_pb.Message{
 			Value: m,
 		},
 	})
+	if err == nil {
+		pc.md5hash.Write(m)
+	}
+	return err
 }
 func (pc *PubChannel) Close() error {
 
@@ -62,3 +70,7 @@ func (pc *PubChannel) Close() error {
 	}
 	return nil
 }
+
+func (pc *PubChannel) Md5() []byte {
+	return pc.md5hash.Sum(nil)
+}
diff --git a/weed/messaging/msgclient/sub_chan.go b/weed/messaging/msgclient/sub_chan.go
index edd4d1049..aae5c0c71 100644
--- a/weed/messaging/msgclient/sub_chan.go
+++ b/weed/messaging/msgclient/sub_chan.go
@@ -1,6 +1,8 @@
 package msgclient
 
 import (
+	"crypto/md5"
+	"hash"
 	"io"
 	"log"
 	"time"
@@ -10,8 +12,9 @@ import (
 )
 
 type SubChannel struct {
-	ch     chan []byte
-	stream messaging_pb.SeaweedMessaging_SubscribeClient
+	ch      chan []byte
+	stream  messaging_pb.SeaweedMessaging_SubscribeClient
+	md5hash hash.Hash
 }
 
 func (mc *MessagingClient) NewSubChannel(chanName string) (*SubChannel, error) {
@@ -30,8 +33,9 @@ func (mc *MessagingClient) NewSubChannel(chanName string) (*SubChannel, error) {
 	}
 
 	t := &SubChannel{
-		ch:     make(chan []byte),
-		stream: sc,
+		ch:      make(chan []byte),
+		stream:  sc,
+		md5hash: md5.New(),
 	}
 
 	go func() {
@@ -51,6 +55,7 @@ func (mc *MessagingClient) NewSubChannel(chanName string) (*SubChannel, error) {
 				close(t.ch)
 				return
 			}
+			t.md5hash.Write(resp.Data.Value)
 			t.ch <- resp.Data.Value
 		}
 	}()
@@ -61,3 +66,7 @@ func (mc *MessagingClient) NewSubChannel(chanName string) (*SubChannel, error) {
 func (sc *SubChannel) Channel() chan []byte {
 	return sc.ch
 }
+
+func (sc *SubChannel) Md5() []byte {
+	return sc.md5hash.Sum(nil)
+}