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package agent_client
import (
"context"
"fmt"
"github.com/seaweedfs/seaweedfs/weed/mq/schema"
"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 PublishSession struct {
schema *schema.Schema
partitionCount int
publisherName string
stream grpc.BidiStreamingClient[mq_agent_pb.PublishRecordRequest, mq_agent_pb.PublishRecordResponse]
}
func NewPublishSession(agentAddress string, topicSchema *schema.Schema, partitionCount int, publisherName string) (*PublishSession, 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)
resp, err := agentClient.StartPublishSession(context.Background(), &mq_agent_pb.StartPublishSessionRequest{
Topic: &schema_pb.Topic{
Namespace: topicSchema.Namespace,
Name: topicSchema.Name,
},
PartitionCount: int32(partitionCount),
RecordType: topicSchema.RecordType,
PublisherName: publisherName,
})
if err != nil {
return nil, err
}
if resp.Error != "" {
return nil, fmt.Errorf("start publish session: %v", resp.Error)
}
stream, err := agentClient.PublishRecord(context.Background())
if err != nil {
return nil, fmt.Errorf("publish record: %v", err)
}
if err = stream.Send(&mq_agent_pb.PublishRecordRequest{
SessionId: resp.SessionId,
}); err != nil {
return nil, fmt.Errorf("send session id: %v", err)
}
return &PublishSession{
schema: topicSchema,
partitionCount: partitionCount,
publisherName: publisherName,
stream: stream,
}, nil
}
func (a *PublishSession) CloseSession() error {
if a.schema == nil {
return nil
}
err := a.stream.CloseSend()
if err != nil {
return fmt.Errorf("close send: %v", err)
}
a.schema = nil
return err
}
func (a *PublishSession) PublishMessageRecord(key []byte, record *schema_pb.RecordValue) error {
return a.stream.Send(&mq_agent_pb.PublishRecordRequest{
Key: key,
Value: record,
})
}
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