1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
package msgclient
import (
"context"
"github.com/OneOfOne/xxhash"
"google.golang.org/grpc"
"github.com/chrislusf/seaweedfs/weed/mq/broker"
"github.com/chrislusf/seaweedfs/weed/pb/mq_pb"
)
type Publisher struct {
publishClients []mq_pb.SeaweedMessaging_PublishClient
topicConfiguration *mq_pb.TopicConfiguration
messageCount uint64
publisherId string
}
func (mc *MessagingClient) NewPublisher(publisherId, namespace, topic string) (*Publisher, error) {
// read topic configuration
topicConfiguration := &mq_pb.TopicConfiguration{
PartitionCount: 4,
}
publishClients := make([]mq_pb.SeaweedMessaging_PublishClient, topicConfiguration.PartitionCount)
for i := 0; i < int(topicConfiguration.PartitionCount); i++ {
tp := broker.TopicPartition{
Namespace: namespace,
Topic: topic,
Partition: int32(i),
}
grpcClientConn, err := mc.findBroker(tp)
if err != nil {
return nil, err
}
client, err := setupPublisherClient(grpcClientConn, tp)
if err != nil {
return nil, err
}
publishClients[i] = client
}
return &Publisher{
publishClients: publishClients,
topicConfiguration: topicConfiguration,
}, nil
}
func setupPublisherClient(grpcConnection *grpc.ClientConn, tp broker.TopicPartition) (mq_pb.SeaweedMessaging_PublishClient, error) {
stream, err := mq_pb.NewSeaweedMessagingClient(grpcConnection).Publish(context.Background())
if err != nil {
return nil, err
}
// send init message
err = stream.Send(&mq_pb.PublishRequest{
Init: &mq_pb.PublishRequest_InitMessage{
Namespace: tp.Namespace,
Topic: tp.Topic,
Partition: tp.Partition,
},
})
if err != nil {
return nil, err
}
// process init response
initResponse, err := stream.Recv()
if err != nil {
return nil, err
}
if initResponse.Redirect != nil {
// TODO follow redirection
}
if initResponse.Config != nil {
}
// setup looks for control messages
doneChan := make(chan error, 1)
go func() {
for {
in, err := stream.Recv()
if err != nil {
doneChan <- err
return
}
if in.Redirect != nil {
}
if in.Config != nil {
}
}
}()
return stream, nil
}
func (p *Publisher) Publish(m *mq_pb.Message) error {
hashValue := p.messageCount
p.messageCount++
if p.topicConfiguration.Partitoning == mq_pb.TopicConfiguration_NonNullKeyHash {
if m.Key != nil {
hashValue = xxhash.Checksum64(m.Key)
}
} else if p.topicConfiguration.Partitoning == mq_pb.TopicConfiguration_KeyHash {
hashValue = xxhash.Checksum64(m.Key)
} else {
// round robin
}
idx := int(hashValue) % len(p.publishClients)
if idx < 0 {
idx += len(p.publishClients)
}
return p.publishClients[idx].Send(&mq_pb.PublishRequest{
Data: m,
})
}
|
