1 files changed, 87 insertions, 0 deletions
diff --git a/weed/mq/client/agent_client/subscribe_session.go b/weed/mq/client/agent_client/subscribe_session.go
new file mode 100644
index 000000000..397450a29
--- /dev/null
+++ b/weed/mq/client/agent_client/subscribe_session.go
@@ -0,0 +1,87 @@
+package agent_client
+
+import (
+	"context"
+	"fmt"
+	"github.com/seaweedfs/seaweedfs/weed/mq/topic"
+	"github.com/seaweedfs/seaweedfs/weed/pb/mq_agent_pb"
+	"github.com/seaweedfs/seaweedfs/weed/pb/schema_pb"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+type SubscribeOption struct {
+	ConsumerGroup           string
+	ConsumerGroupInstanceId string
+	Topic                   topic.Topic
+	OffsetType              schema_pb.OffsetType
+	OffsetTsNs              int64
+	Filter                  string
+	MaxSubscribedPartitions int32
+	SlidingWindowSize       int32
+}
+
+type SubscribeSession struct {
+	Option *SubscribeOption
+	stream grpc.BidiStreamingClient[mq_agent_pb.SubscribeRecordRequest, mq_agent_pb.SubscribeRecordResponse]
+}
+
+func NewSubscribeSession(agentAddress string, option *SubscribeOption) (*SubscribeSession, error) {
+	// call local agent grpc server to create a new session
+	clientConn, err := grpc.NewClient(agentAddress, grpc.WithTransportCredentials(insecure.NewCredentials()))
+	if err != nil {
+		return nil, fmt.Errorf("dial agent server %s: %v", agentAddress, err)
+	}
+	agentClient := mq_agent_pb.NewSeaweedMessagingAgentClient(clientConn)
+
+	initRequest := &mq_agent_pb.SubscribeRecordRequest_InitSubscribeRecordRequest{
+		ConsumerGroup:           option.ConsumerGroup,
+		ConsumerGroupInstanceId: option.ConsumerGroupInstanceId,
+		Topic: &schema_pb.Topic{
+			Namespace: option.Topic.Namespace,
+			Name:      option.Topic.Name,
+		},
+		OffsetType:              option.OffsetType,
+		OffsetTsNs:              option.OffsetTsNs,
+		MaxSubscribedPartitions: option.MaxSubscribedPartitions,
+		Filter:                  option.Filter,
+		SlidingWindowSize:       option.SlidingWindowSize,
+	}
+
+	stream, err := agentClient.SubscribeRecord(context.Background())
+	if err != nil {
+		return nil, fmt.Errorf("subscribe record: %v", err)
+	}
+
+	if err = stream.Send(&mq_agent_pb.SubscribeRecordRequest{
+		Init: initRequest,
+	}); err != nil {
+		return nil, fmt.Errorf("send session id: %v", err)
+	}
+
+	return &SubscribeSession{
+		Option: option,
+		stream: stream,
+	}, nil
+}
+
+func (s *SubscribeSession) CloseSession() error {
+	err := s.stream.CloseSend()
+	return err
+}
+
+func (a *SubscribeSession) SubscribeMessageRecord(
+	onEachMessageFn func(key []byte, record *schema_pb.RecordValue),
+	onCompletionFn func()) error {
+	for {
+		resp, err := a.stream.Recv()
+		if err != nil {
+			return err
+		}
+		onEachMessageFn(resp.Key, resp.Value)
+	}
+	if onCompletionFn != nil {
+		onCompletionFn()
+	}
+	return nil
+}