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jetstream: introduce experimental package using new API (#13)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,162 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "os" | ||
| "os/signal" | ||
| "syscall" | ||
| "time" | ||
|
|
||
| "github.com/ThreeDotsLabs/watermill" | ||
| "github.com/ThreeDotsLabs/watermill-nats/v2/pkg/jetstream" | ||
| "github.com/ThreeDotsLabs/watermill/message" | ||
| "github.com/nats-io/nats-server/v2/server" | ||
| "github.com/nats-io/nats.go" | ||
| natsJS "github.com/nats-io/nats.go/jetstream" | ||
| ) | ||
|
|
||
| func main() { | ||
| ctx, cancel := context.WithCancel(context.Background()) | ||
| defer cancel() | ||
|
|
||
| svr, err := server.NewServer(&server.Options{ | ||
| Port: 42223, | ||
| JetStream: true, | ||
| }) | ||
|
|
||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| svr.Start() | ||
| defer svr.Shutdown() | ||
|
|
||
| topic := "example_topic" | ||
| // this is the default watermill will look for if no namer func passed | ||
| consumer := fmt.Sprintf("watermill__%s", topic) | ||
| var namer jetstream.ConsumerConfigurator | ||
|
|
||
| // test a custom namer | ||
| /* | ||
| consumer := fmt.Sprintf("test__%s", topic) | ||
| namer := func(s, _ string) string { | ||
| return fmt.Sprintf("test__%s", s) | ||
| } | ||
| */ | ||
|
|
||
| logger := watermill.NewStdLogger(true, true) | ||
| mainLogFields := watermill.LogFields{"topic": topic, "consumer": consumer, "url": svr.ClientURL()} | ||
|
|
||
| // create an existing jetstream consumer and connect explicitly | ||
| conn, natsConnectErr := nats.Connect(svr.ClientURL()) | ||
| if natsConnectErr != nil { | ||
| panic(err) | ||
| } | ||
| js, jsErr := natsJS.New(conn) | ||
| if jsErr != nil { | ||
| panic(jsErr) | ||
| } | ||
| s, se := js.CreateStream(ctx, natsJS.StreamConfig{ | ||
| Name: topic, | ||
| Subjects: []string{topic}, | ||
| }) | ||
| if se != nil { | ||
| panic(se) | ||
| } | ||
| _, ce := s.CreateOrUpdateConsumer(ctx, natsJS.ConsumerConfig{ | ||
| Name: consumer, | ||
| AckPolicy: natsJS.AckExplicitPolicy, | ||
| }) | ||
| if ce != nil { | ||
| panic(ce) | ||
| } | ||
|
|
||
| subscriber, err := jetstream.NewSubscriber(jetstream.SubscriberConfig{ | ||
| URL: svr.ClientURL(), | ||
| Logger: logger, | ||
| AckWaitTimeout: 5 * time.Second, | ||
| ResourceInitializer: jetstream.ExistingConsumer(namer, ""), | ||
| }) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| stopPublisher := make(chan struct{}, 1) | ||
|
|
||
| messages, err := subscriber.Subscribe(ctx, "example_topic") | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| go func() { | ||
| for msg := range messages { | ||
| logger.Info(fmt.Sprintf("received message: %s (test: %s), payload: %s", msg.UUID, msg.Metadata.Get("test"), string(msg.Payload)), mainLogFields) | ||
|
|
||
| // we need to Acknowledge that we received and processed the message, | ||
| // otherwise, it will be resent over and over again. | ||
| msg.Ack() | ||
| } | ||
| logger.Info("subscriber stopped", mainLogFields) | ||
| }() | ||
|
|
||
| publisher, err := jetstream.NewPublisher(jetstream.PublisherConfig{ | ||
| URL: svr.ClientURL(), | ||
| Logger: logger, | ||
| }) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| logger.Info("starting", mainLogFields) | ||
|
|
||
| go func() { | ||
| for { | ||
| select { | ||
| case <-stopPublisher: | ||
| if closeErr := publisher.Close(); err != nil { | ||
| logger.Error("failed to close publisher", closeErr, mainLogFields) | ||
| } | ||
| logger.Info("publisher stopped", mainLogFields) | ||
|
|
||
| case <-time.After(time.Second): | ||
| msg := message.NewMessage(watermill.NewUUID(), []byte("Hello, world!")) | ||
| msg.Metadata.Set("test", watermill.NewShortUUID()) | ||
| if err := publisher.Publish(topic, msg); err != nil { | ||
| logger.Error("publish failed", err, mainLogFields) | ||
| } | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| c := make(chan os.Signal) | ||
| signal.Notify(c, os.Interrupt, syscall.SIGTERM) | ||
|
|
||
| for { | ||
| select { | ||
|
|
||
| case sig := <-c: | ||
| signal.Ignore(sig) | ||
| logger.Info("Ctrl+C pressed in Terminal - shutting down", mainLogFields) | ||
| stopPublisher <- struct{}{} | ||
| if closeErr := subscriber.Close(); closeErr != nil { | ||
| logger.Error("failed to close subscriber", closeErr, mainLogFields) | ||
| } else { | ||
| logger.Info("subscriber closed", mainLogFields) | ||
| } | ||
| if cde := s.DeleteConsumer(ctx, consumer); cde != nil { | ||
| logger.Error("failed to delete consumer", cde, mainLogFields) | ||
| } else { | ||
| logger.Info("consumer deleted", mainLogFields) | ||
| } | ||
| if sde := js.DeleteStream(ctx, topic); sde != nil { | ||
| logger.Error("failed to delete stream", sde, mainLogFields) | ||
| } else { | ||
| logger.Info("stream deleted", mainLogFields) | ||
| } | ||
|
|
||
| logger.Info("done", mainLogFields) | ||
| return | ||
| } | ||
| } | ||
| } |
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