98 lines
2.0 KiB
Go
98 lines
2.0 KiB
Go
package main
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import (
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"context"
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"fmt"
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"log"
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"os"
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"os/signal"
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"syscall"
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"time"
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"github.com/ThreeDotsLabs/watermill"
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"github.com/ThreeDotsLabs/watermill-nats/v2/pkg/nats"
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"github.com/ThreeDotsLabs/watermill/message"
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nc "github.com/nats-io/nats.go"
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)
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func main() {
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natsURL := "nats://nats:4222"
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marshaler := &nats.GobMarshaler{}
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logger := watermill.NewStdLogger(false, false)
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options := []nc.Option{
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nc.RetryOnFailedConnect(true),
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nc.Timeout(30 * time.Second),
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nc.ReconnectWait(1 * time.Second),
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}
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jsConfig := nats.JetStreamConfig{Disabled: true}
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subscriber, err := nats.NewSubscriber(
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nats.SubscriberConfig{
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URL: natsURL,
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CloseTimeout: 30 * time.Second,
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AckWaitTimeout: 30 * time.Second,
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NatsOptions: options,
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Unmarshaler: marshaler,
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JetStream: jsConfig,
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},
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logger,
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)
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if err != nil {
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panic(err)
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}
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c := make(chan os.Signal)
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signal.Notify(c, os.Interrupt, syscall.SIGTERM)
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go func() {
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<-c
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fmt.Println("\r- Ctrl+C pressed in Terminal - closing subscriber")
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subscriber.Close()
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os.Exit(0)
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}()
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messages, err := subscriber.Subscribe(context.Background(), "example_topic_nats")
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if err != nil {
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panic(err)
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}
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go process(messages)
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publisher, err := nats.NewPublisher(
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nats.PublisherConfig{
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URL: natsURL,
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NatsOptions: options,
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Marshaler: marshaler,
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JetStream: jsConfig,
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},
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logger,
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)
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if err != nil {
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panic(err)
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}
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publishMessages(publisher)
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}
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func publishMessages(publisher message.Publisher) {
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for {
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msg := message.NewMessage(watermill.NewUUID(), []byte("Hello, world!"))
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if err := publisher.Publish("example_topic_nats", msg); err != nil {
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panic(err)
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}
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time.Sleep(time.Second)
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}
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}
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func process(messages <-chan *message.Message) {
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for msg := range messages {
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log.Printf("received message: %s, payload: %s", msg.UUID, string(msg.Payload))
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// we need to Acknowledge that we received and processed the message,
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// otherwise, it will be resent over and over again.
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msg.Ack()
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}
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}
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