-
-
Notifications
You must be signed in to change notification settings - Fork 0
/
broker.go
59 lines (47 loc) · 1.38 KB
/
broker.go
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
package broker
import (
"context"
"cloud.google.com/go/pubsub"
)
// Broker is an interface used for asynchronous messaging.
type Broker interface {
Options() Options
Shutdown() error
Publish(topic string, m *pubsub.Message, opts ...PublishOption) error
Subscribe(topic string, h Handler, opts ...SubscribeOption) error
String() string
}
// Handler is used to process messages via a subscription of a topic.
// The handler is passed a publication interface which contains the
// message and optional Ack method to acknowledge receipt of the message.
type Handler func(context.Context, *pubsub.Message) error
type Message struct {
Header map[string]string
Body []byte
}
// Event is given to a subscription handler for processing
type Event interface {
Topic() string
Message() *Message
Ack() error
Error() error
}
// Subscriber is a convenience return type for the Subscribe method
type Subscriber interface {
Options() SubscribeOptions
Topic() string
Unsubscribe() error
}
var DefaultBroker Broker
func Shutdown() error {
return DefaultBroker.Shutdown()
}
func Publish(topic string, msg *pubsub.Message, opts ...PublishOption) error {
return DefaultBroker.Publish(topic, msg, opts...)
}
func Subscribe(topic string, handler Handler, opts ...SubscribeOption) error {
return DefaultBroker.Subscribe(topic, handler, opts...)
}
func String() string {
return DefaultBroker.String()
}