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|
package msgclient
import (
"io"
"log"
"time"
"github.com/chrislusf/seaweedfs/weed/messaging/broker"
"github.com/chrislusf/seaweedfs/weed/pb/messaging_pb"
)
type PubChannel struct {
client messaging_pb.SeaweedMessaging_PublishClient
}
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,
}, nil
}
func (pc *PubChannel) Publish(m []byte) error {
return pc.client.Send(&messaging_pb.PublishRequest{
Data: &messaging_pb.Message{
Value: m,
},
})
}
func (pc *PubChannel) Close() error {
return pc.client.CloseSend()
}
type SubChannel struct {
ch chan []byte
stream messaging_pb.SeaweedMessaging_SubscribeClient
}
func (mc *MessagingClient) NewSubChannel(chanName string) (*SubChannel, error) {
tp := broker.TopicPartition{
Namespace: "chan",
Topic: chanName,
Partition: 0,
}
grpcConnection, err := mc.findBroker(tp)
if err != nil {
return nil, err
}
sc, err := setupSubscriberClient(grpcConnection, "", "chan", chanName, 0, time.Unix(0,0))
if err != nil {
return nil, err
}
t := &SubChannel{
ch: make(chan []byte),
stream: sc,
}
go func() {
for {
resp, subErr := t.stream.Recv()
if subErr == io.EOF {
return
}
if subErr != nil {
log.Printf("fail to receive from netchan %s: %v", chanName, subErr)
return
}
if resp.IsClose {
close(t.ch)
return
}
if resp.Data != nil {
t.ch <- resp.Data.Value
}
}
}()
return t, nil
}
func (sc *SubChannel) Channel() chan []byte {
return sc.ch
}
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