api for sub

weed/mq/client/cmd/weed_sub/subscriber.go

@@ -3,27 +3,41 @@ package main
 import (
 	"fmt"
 	"github.com/seaweedfs/seaweedfs/weed/mq/client/sub_client"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
 )
 
 func main() {
 
-	subscriber := sub_client.NewTopicSubscriber(
-		&sub_client.SubscriberConfiguration{
-			ConsumerGroup: "test",
-			ConsumerId:    "test",
-		},
-		"test", "test")
+	subscriberConfig := &sub_client.SubscriberConfiguration{
+		ClientId:        "testSubscriber",
+		GroupId:         "test",
+		GroupInstanceId: "test",
+		GrpcDialOption:  grpc.WithTransportCredentials(insecure.NewCredentials()),
+	}
+
+	contentConfig := &sub_client.ContentConfiguration{
+		Namespace: "test",
+		Topic:     "test",
+		Filter:    "",
+	}
+
+	subscriber := sub_client.NewTopicSubscriber(subscriberConfig, contentConfig)
 	if err := subscriber.Connect("localhost:17777"); err != nil {
 		fmt.Println(err)
 		return
 	}
 
-	if err := subscriber.Subscribe(func(key, value []byte) bool {
+	subscriber.SetEachMessageFunc(func(key, value []byte) bool {
 		println(string(key), "=>", string(value))
 		return true
-	}, func() {
+	})
+
+	subscriber.SetCompletionFunc(func() {
 		println("done subscribing")
-	}); err != nil {
+	})
+
+	if err := subscriber.Subscribe(); err != nil {
 		fmt.Println(err)
 	}
 

weed/mq/client/sub_client/lookup.go

@@ -10,13 +10,13 @@ import (
 func (sub *TopicSubscriber) doLookup(brokerAddress string) error {
 	err := pb.WithBrokerGrpcClient(true,
 		brokerAddress,
-		sub.grpcDialOption,
+		sub.SubscriberConfig.GrpcDialOption,
 		func(client mq_pb.SeaweedMessagingClient) error {
 			lookupResp, err := client.LookupTopicBrokers(context.Background(),
 				&mq_pb.LookupTopicBrokersRequest{
 					Topic: &mq_pb.Topic{
-						Namespace: sub.namespace,
-						Name:      sub.topic,
+						Namespace: sub.ContentConfig.Namespace,
+						Name:      sub.ContentConfig.Topic,
 					},
 					IsForPublish: false,
 				})
@@ -28,7 +28,7 @@ func (sub *TopicSubscriber) doLookup(brokerAddress string) error {
 		})
 
 	if err != nil {
-		return fmt.Errorf("lookup topic %s/%s: %v", sub.namespace, sub.topic, err)
+		return fmt.Errorf("lookup topic %s/%s: %v", sub.ContentConfig.Namespace, sub.ContentConfig.Topic, err)
 	}
 	return nil
 }

weed/mq/client/sub_client/subscribe.go

@@ -8,33 +8,34 @@ import (
 	"sync"
 )
 
-type EachMessageFunc func(key, value []byte) (shouldContinue bool)
-type FinalFunc func()
+// Subscribe subscribes to a topic's specified partitions.
+// If a partition is moved to another broker, the subscriber will automatically reconnect to the new broker.
 
-func (sub *TopicSubscriber) Subscribe(eachMessageFn EachMessageFunc, finalFn FinalFunc) error {
+func (sub *TopicSubscriber) Subscribe() error {
 	var wg sync.WaitGroup
 	for _, brokerPartitionAssignment := range sub.brokerPartitionAssignments {
 		brokerAddress := brokerPartitionAssignment.LeaderBroker
-		grpcConnection, err := pb.GrpcDial(context.Background(), brokerAddress, true, sub.grpcDialOption)
+		grpcConnection, err := pb.GrpcDial(context.Background(), brokerAddress, true, sub.SubscriberConfig.GrpcDialOption)
 		if err != nil {
 			return fmt.Errorf("dial broker %s: %v", brokerAddress, err)
 		}
 		brokerClient := mq_pb.NewSeaweedMessagingClient(grpcConnection)
 		subscribeClient, err := brokerClient.Subscribe(context.Background(), &mq_pb.SubscribeRequest{
 			Consumer: &mq_pb.SubscribeRequest_Consumer{
-				ConsumerGroup: sub.config.ConsumerGroup,
-				ConsumerId:    sub.config.ConsumerId,
+				ConsumerGroup: sub.SubscriberConfig.GroupId,
+				ConsumerId:    sub.SubscriberConfig.GroupInstanceId,
 			},
 			Cursor: &mq_pb.SubscribeRequest_Cursor{
 				Topic: &mq_pb.Topic{
-					Namespace: sub.namespace,
-					Name:      sub.topic,
+					Namespace: sub.ContentConfig.Namespace,
+					Name:      sub.ContentConfig.Topic,
 				},
 				Partition: &mq_pb.Partition{
 					RingSize:   brokerPartitionAssignment.Partition.RingSize,
 					RangeStart: brokerPartitionAssignment.Partition.RangeStart,
 					RangeStop:  brokerPartitionAssignment.Partition.RangeStop,
 				},
+				Filter: sub.ContentConfig.Filter,
 			},
 		})
 		if err != nil {
@@ -43,8 +44,8 @@ func (sub *TopicSubscriber) Subscribe(eachMessageFn EachMessageFunc, finalFn Fin
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
-			if finalFn != nil {
-				defer finalFn()
+			if sub.OnCompletionFunc != nil {
+				defer sub.OnCompletionFunc()
 			}
 			for {
 				resp, err := subscribeClient.Recv()
@@ -57,7 +58,7 @@ func (sub *TopicSubscriber) Subscribe(eachMessageFn EachMessageFunc, finalFn Fin
 				}
 				switch m := resp.Message.(type) {
 				case *mq_pb.SubscribeResponse_Data:
-					if !eachMessageFn(m.Data.Key, m.Data.Value) {
+					if !sub.OnEachMessageFunc(m.Data.Key, m.Data.Value) {
 						return
 					}
 				case *mq_pb.SubscribeResponse_Ctrl:

weed/mq/client/sub_client/subscriber.go

@@ -3,28 +3,37 @@ package sub_client
 import (
 	"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/credentials/insecure"
 )
 
 type SubscriberConfiguration struct {
-	ConsumerGroup string
-	ConsumerId    string
+	ClientId         string
+	GroupId          string
+	GroupInstanceId  string
+	BootstrapServers []string
+	GrpcDialOption   grpc.DialOption
 }
 
+type ContentConfiguration struct {
+	Namespace string
+	Topic     string
+	Filter    string
+}
+
+type OnEachMessageFunc func(key, value []byte) (shouldContinue bool)
+type OnCompletionFunc func()
+
 type TopicSubscriber struct {
-	config                     *SubscriberConfiguration
-	namespace                  string
-	topic                      string
+	SubscriberConfig           *SubscriberConfiguration
+	ContentConfig              *ContentConfiguration
 	brokerPartitionAssignments []*mq_pb.BrokerPartitionAssignment
-	grpcDialOption             grpc.DialOption
+	OnEachMessageFunc          OnEachMessageFunc
+	OnCompletionFunc           OnCompletionFunc
 }
 
-func NewTopicSubscriber(config *SubscriberConfiguration, namespace, topic string) *TopicSubscriber {
+func NewTopicSubscriber(subscriber *SubscriberConfiguration, content *ContentConfiguration) *TopicSubscriber {
 	return &TopicSubscriber{
-		config:         config,
-		namespace:      namespace,
-		topic:          topic,
-		grpcDialOption: grpc.WithTransportCredentials(insecure.NewCredentials()),
+		SubscriberConfig: subscriber,
+		ContentConfig:    content,
 	}
 }
 
@@ -34,3 +43,11 @@ func (sub *TopicSubscriber) Connect(bootstrapBroker string) error {
 	}
 	return nil
 }
+
+func (sub *TopicSubscriber) SetEachMessageFunc(onEachMessageFn OnEachMessageFunc) {
+	sub.OnEachMessageFunc = onEachMessageFn
+}
+
+func (sub *TopicSubscriber) SetCompletionFunc(onCompeletionFn OnCompletionFunc) {
+	sub.OnCompletionFunc = onCompeletionFn
+}