Change RocksMQ interface

Signed-off-by: Xiangyu Wang <xiangyu.wang@zilliz.com>

docs/developer_guides/chap04_message_stream.md

@@ -195,14 +195,14 @@ type Channel struct {
     endOffset MessageID
 }
 
-type ComsumerGroupContext struct {
+type ConsumerGroupContext struct {
     currentOffset MessageID
 }
 
 // Every collection has its RocksMQ
 type RocksMQ struct {
     channels map[string]Channel
-    cgCtxs map[string]ComsumerGroupContext
+    cgCtxs map[string]ConsumerGroupContext
     mu sync.Mutex
 }
 

internal/msgstream/rmq/rmq_msgstream.go

@@ -0,0 +1,30 @@
+package rmqmsgstream
+
+import "github.com/zilliztech/milvus-distributed/internal/msgstream"
+
+type RmqMsgStream struct {
+}
+
+func NewRmqMsgStream() *RmqMsgStream {
+	return nil
+}
+
+func (ms *RmqMsgStream) Start() {
+
+}
+
+func (ms *RmqMsgStream) Close() {
+
+}
+
+func (ms *RmqMsgStream) Produce(pack *msgstream.MsgPack) error {
+	return nil
+}
+
+func (ms *RmqMsgStream) Consume() *msgstream.MsgPack {
+	return nil
+}
+
+func (ms *RmqMsgStream) Chan() <-chan *msgstream.MsgPack {
+	return nil
+}

internal/util/rocksmq/rocksmq.go

@@ -0,0 +1,130 @@
+package rocksmq
+
+import (
+	"sync"
+
+	"github.com/zilliztech/milvus-distributed/internal/errors"
+	"github.com/zilliztech/milvus-distributed/internal/kv"
+	memkv "github.com/zilliztech/milvus-distributed/internal/kv/mem"
+	"github.com/zilliztech/milvus-distributed/internal/util/typeutil"
+)
+
+type UniqueID = typeutil.UniqueID
+
+type ProducerMessage struct {
+	payload []byte
+}
+
+type ConsumerMessage struct {
+	msgID   UniqueID
+	payload []byte
+}
+
+type Channel struct {
+	beginOffset UniqueID
+	endOffset   UniqueID
+}
+
+type ConsumerGroupContext struct {
+	currentOffset UniqueID
+}
+
+type RocksMQ struct {
+	kv       kv.Base
+	channels map[string]*Channel
+	cgCtxs   map[string]ConsumerGroupContext
+	mu       sync.Mutex
+}
+
+func NewRocksMQ() *RocksMQ {
+	mkv := memkv.NewMemoryKV()
+	rmq := &RocksMQ{
+		kv: mkv,
+	}
+	return rmq
+}
+
+func (rmq *RocksMQ) checkKeyExist(key string) bool {
+	_, err := rmq.kv.Load(key)
+	return err == nil
+}
+
+func (rmq *RocksMQ) CreateChannel(channelName string) error {
+	beginKey := channelName + "/begin_id"
+	endKey := channelName + "/end_id"
+
+	// Check if channel exist
+	if rmq.checkKeyExist(beginKey) || rmq.checkKeyExist(endKey) {
+		return errors.New("Channel " + channelName + " already exists.")
+	}
+
+	err := rmq.kv.Save(beginKey, "0")
+	if err != nil {
+		return err
+	}
+
+	err = rmq.kv.Save(endKey, "0")
+	if err != nil {
+		return err
+	}
+
+	channel := &Channel{
+		beginOffset: 0,
+		endOffset:   0,
+	}
+	rmq.channels[channelName] = channel
+	return nil
+}
+
+func (rmq *RocksMQ) DestroyChannel(channelName string) error {
+	beginKey := channelName + "/begin_id"
+	endKey := channelName + "/end_id"
+
+	err := rmq.kv.Remove(beginKey)
+	if err != nil {
+		return err
+	}
+
+	err = rmq.kv.Remove(endKey)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (rmq *RocksMQ) CreateConsumerGroup(groupName string, channelName string) error {
+	key := groupName + "/" + channelName + "/current_id"
+	if rmq.checkKeyExist(key) {
+		return errors.New("ConsumerGroup " + groupName + " already exists.")
+	}
+	err := rmq.kv.Save(key, "0")
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (rmq *RocksMQ) DestroyConsumerGroup(groupName string, channelName string) error {
+	key := groupName + "/" + channelName + "/current_id"
+
+	err := rmq.kv.Remove(key)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (rmq *RocksMQ) Produce(channelName string, messages []ProducerMessage) error {
+	return nil
+}
+
+func (rmq *RocksMQ) Consume(groupName string, channelName string, n int) ([]ConsumerMessage, error) {
+	return nil, nil
+}
+
+func (rmq *RocksMQ) Seek(groupName string, channelName string, msgID UniqueID) error {
+	return nil
+}