mirror of https://github.com/tidwall/tile38.git
46 lines
1.3 KiB
Markdown
46 lines
1.3 KiB
Markdown
|
## Cloud Pub/Sub [](https://godoc.org/cloud.google.com/go/pubsub)
|
||
|
|
|
||
|
|
- [About Cloud Pubsub](https://cloud.google.com/pubsub/)
|
||
|
|
- [API documentation](https://cloud.google.com/pubsub/docs)
|
||
|
|
- [Go client documentation](https://godoc.org/cloud.google.com/go/pubsub)
|
||
|
|
- [Complete sample programs](https://github.com/GoogleCloudPlatform/golang-samples/tree/master/pubsub)
|
||
|
|
|
||
|
|
### Example Usage
|
||
|
|
|
||
|
|
First create a `pubsub.Client` to use throughout your application:
|
||
|
|
|
||
|
|
[snip]:# (pubsub-1)
|
||
|
|
```go
|
||
|
|
client, err := pubsub.NewClient(ctx, "project-id")
|
||
|
|
if err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
Then use the client to publish and subscribe:
|
||
|
|
|
||
|
|
[snip]:# (pubsub-2)
|
||
|
|
```go
|
||
|
|
// Publish "hello world" on topic1.
|
||
|
|
topic := client.Topic("topic1")
|
||
|
|
res := topic.Publish(ctx, &pubsub.Message{
|
||
|
|
Data: []byte("hello world"),
|
||
|
|
})
|
||
|
|
// The publish happens asynchronously.
|
||
|
|
// Later, you can get the result from res:
|
||
|
|
...
|
||
|
|
msgID, err := res.Get(ctx)
|
||
|
|
if err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Use a callback to receive messages via subscription1.
|
||
|
|
sub := client.Subscription("subscription1")
|
||
|
|
err = sub.Receive(ctx, func(ctx context.Context, m *pubsub.Message) {
|
||
|
|
fmt.Println(m.Data)
|
||
|
|
m.Ack() // Acknowledge that we've consumed the message.
|
||
|
|
})
|
||
|
|
if err != nil {
|
||
|
|
log.Println(err)
|
||
|
|
}
|
||
|
|
```
|