chirpnest/mq.go

package main

import (
	"encoding/json"
	"log"
	"strconv"

	"github.com/streadway/amqp"
)

func MQGetMsgWorker(id int, msgs chan<- ChatWarsMessage) {
	var x ChatWarsMessage
	conn, err := amqp.Dial("amqp://" + cfg.Rabbit.User + ":" + cfg.Rabbit.Password + "@" + cfg.Rabbit.Host + "/" + cfg.Rabbit.Queue)
	failOnError(err, "MQGetMsgWorker["+strconv.Itoa(id)+"] : Failed to connect to RabbitMQ")
	defer conn.Close()

	ch, err := conn.Channel()
	failOnError(err, "MQGetMsgWorker["+strconv.Itoa(id)+"] : Failed to open a channel")
	defer ch.Close()

	q, err := ch.QueueDeclare(
		"msg", // name
		false, // durable
		false, // delete when unused
		false, // exclusive
		false, // no-wait
		nil,   // arguments
	)
	failOnError(err, "MQGetMsgWorker["+strconv.Itoa(id)+"] : Failed to declare a queue")

	m, err := ch.Consume(
		q.Name, // queue
		"",     // consumer
		true,   // auto-ack
		false,  // exclusive
		false,  // no-local
		false,  // no-wait
		nil,    // args
	)
	failOnError(err, "MQGetMsgWorker["+strconv.Itoa(id)+"] : Failed to register a consumer")

	for d := range m {
		log.Printf("MQGetMsgWorker["+strconv.Itoa(id)+"] : Received a message: %s", string(d.Body))

		if err = json.Unmarshal(d.Body, &x); err != nil {
			logOnError(err, "MQGetMsgWorker["+strconv.Itoa(id)+"] : Can't unmarshal.\n"+string(d.Body))
		} else {
			msgs <- x
		}
	}

	log.Printf("MQGetMsgWorker[" + strconv.Itoa(id) + "] : Closing.")

}