Accumulated changes for message queue (#6600)

* rename

* set agent address

* refactor

* add agent sub

* pub messages

* grpc new client

* can publish records via agent

* send init message with session id

* fmt

* check cancelled request while waiting

* use sessionId

* handle possible nil stream

* subscriber process messages

* separate debug port

* use atomic int64

* less logs

* minor

* skip io.EOF

* rename

* remove unused

* use saved offsets

* do not reuse session, since always session id is new after restart

remove last active ts from SessionEntry

* simplify printing

* purge unused

* just proxy the subscription, skipping the session step

* adjust offset types

* subscribe offset type and possible value

* start after the known tsns

* avoid wrongly set startPosition

* move

* remove

* refactor

* typo

* fix

* fix changed path

weed/mq/client/sub_client/subscribe.go

@@ -72,12 +72,12 @@ func (sub *TopicSubscriber) startProcessors() {
 				executors := util.NewLimitedConcurrentExecutor(int(sub.SubscriberConfig.SlidingWindowSize))
 				onDataMessageFn := func(m *mq_pb.SubscribeMessageResponse_Data) {
 					executors.Execute(func() {
-						processErr := sub.OnEachMessageFunc(m.Data.Key, m.Data.Value)
-						if processErr == nil {
-							sub.PartitionOffsetChan <- KeyedOffset{
-								Key:    m.Data.Key,
-								Offset: m.Data.TsNs,
-							}
+						if sub.OnDataMessageFunc != nil {
+							sub.OnDataMessageFunc(m)
+						}
+						sub.PartitionOffsetChan <- KeyedOffset{
+							Key:    m.Data.Key,
+							Offset: m.Data.TsNs,
 						}
 					})
 				}