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// Sources for https://watermill.io/docs/getting-started/
package main
import (
"context"
"log"
"time"
"github.com/ThreeDotsLabs/watermill"
"github.com/ThreeDotsLabs/watermill/message"
"github.com/ThreeDotsLabs/watermill/pubsub/gochannel"
)
func main() {
pubSub := gochannel.NewGoChannel(
gochannel.Config{},
watermill.NewStdLogger(false, false),
)
messages, err := pubSub.Subscribe(context.Background(), "example.topic")
if err != nil {
panic(err)
}
go process(messages)
publishMessages(pubSub)
}
func publishMessages(publisher message.Publisher) {
for {
msg := message.NewMessage(watermill.NewUUID(), []byte("Hello, world!"))
if err := publisher.Publish("example.topic", msg); err != nil {
panic(err)
}
time.Sleep(time.Second)
}
}
func process(messages <-chan *message.Message) {
for msg := range messages {
log.Printf("received message: %s, payload: %s", msg.UUID, string(msg.Payload))
// we need to Acknowledge that we received and processed the message,
// otherwise, it will be resent over and over again.
msg.Ack()
}
}
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