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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-amqp/pkg/amqp"
"github.com/ThreeDotsLabs/watermill/message"
)
var amqpURI = "amqp://guest:guest@rabbitmq:5672/"
func main() {
amqpConfig := amqp.NewDurableQueueConfig(amqpURI)
subscriber, err := amqp.NewSubscriber(
// This config is based on this example: https://www.rabbitmq.com/tutorials/tutorial-two-go.html
// It works as a simple queue.
//
// If you want to implement a Pub/Sub style service instead, check
// https://watermill.io/docs/pub-sub-implementations/#amqp-consumer-groups
amqpConfig,
watermill.NewStdLogger(false, false),
)
if err != nil {
panic(err)
}
messages, err := subscriber.Subscribe(context.Background(), "example.topic")
if err != nil {
panic(err)
}
go process(messages)
publisher, err := amqp.NewPublisher(amqpConfig, watermill.NewStdLogger(false, false))
if err != nil {
panic(err)
}
publishMessages(publisher)
}
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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