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|
package msgclient
import (
"crypto/md5"
"hash"
"io"
"log"
"google.golang.org/grpc"
"github.com/chrislusf/seaweedfs/weed/messaging/broker"
"github.com/chrislusf/seaweedfs/weed/pb/messaging_pb"
)
type PubChannel struct {
client messaging_pb.SeaweedMessaging_PublishClient
grpcConnection *grpc.ClientConn
md5hash hash.Hash
}
func (mc *MessagingClient) NewPubChannel(chanName string) (*PubChannel, error) {
tp := broker.TopicPartition{
Namespace: "chan",
Topic: chanName,
Partition: 0,
}
grpcConnection, err := mc.findBroker(tp)
if err != nil {
return nil, err
}
pc, err := setupPublisherClient(grpcConnection, tp)
if err != nil {
return nil, err
}
return &PubChannel{
client: pc,
grpcConnection: grpcConnection,
md5hash: md5.New(),
}, nil
}
func (pc *PubChannel) Publish(m []byte) error {
err := pc.client.Send(&messaging_pb.PublishRequest{
Data: &messaging_pb.Message{
Value: m,
},
})
if err == nil {
pc.md5hash.Write(m)
}
return err
}
func (pc *PubChannel) Close() error {
// println("send closing")
if err := pc.client.Send(&messaging_pb.PublishRequest{
Data: &messaging_pb.Message{
IsClose: true,
},
}); err != nil {
log.Printf("err send close: %v", err)
}
// println("receive closing")
if _, err := pc.client.Recv(); err != nil && err != io.EOF {
log.Printf("err receive close: %v", err)
}
// println("close connection")
if err := pc.grpcConnection.Close(); err != nil {
log.Printf("err connection close: %v", err)
}
return nil
}
func (pc *PubChannel) Md5() []byte {
return pc.md5hash.Sum(nil)
}
|
