chirpnest/mq.go

package main

import (
	"errors"
	//"log"

	"github.com/streadway/amqp"
)

func (s MQSession) Open() error {
	var (
		err  error
		conn *amqp.Connection
		ch   *amqp.Channel
		q    amqp.Queue
	)
	if s.isConnected {
		return errors.New("Session is already connected.")
	}

	if s.SSL == false {
		conn, err = amqp.Dial("amqp://" + s.User + ":" + s.Password + "@" + s.Host + "/" + s.Path)
		s.MQConnection = conn
	} else {
		return errors.New("SSL connection not implemented")
	}
	logOnError(err, "Open : Failed to connect to RabbitMQ")
	if err != nil {
		s.MQConnection.Close()
		return err
	}
	ch, err = s.MQConnection.Channel()
	s.MQChannel = ch
	logOnError(err, "Open : Failed to open channel")
	if err != nil {
		s.MQChannel.Close()
		s.MQConnection.Close()
		return err
	}
	q, err = s.MQChannel.QueueDeclare(
		s.Queue, // name
		false,   // durable
		false,   // delete when unused
		false,   // exclusive
		false,   // no-wait
		nil,     // arguments

	)
	s.MQQueue = &q
	logOnError(err, "Open : Failed to declare queue")
	if err != nil {
		s.MQChannel.Close()
		s.MQConnection.Close()
		return err
	}
	s.MQDelivery, err = s.MQChannel.Consume(
		s.MQQueue.Name, // queue
		"",             // consumer
		true,           // auto-ack
		false,          // exclusive
		false,          // no-local
		false,          // no-wait
		nil,            // args
	)
	logOnError(err, "Open : Failed to register a consumer")
	if err != nil {
		s.MQChannel.Close()
		s.MQConnection.Close()
		return err
	}
	//log.Printf("Open : MQ Connected to amqp://" + s.User + ":" + s.Password + "@" + s.Host + "/" + s.Path)
	s.isConnected = true
	return nil
}

func (s MQSession) Publish(content string, msg string) error {
	err := s.MQChannel.Publish(
		"",             // exchange
		s.MQQueue.Name, // routing key
		false,          // mandatory
		false,          // immediate
		amqp.Publishing{
			ContentType: content,
			Body:        []byte(msg),
		})
	logOnError(err, "Publish : Publish")
	if err != nil {
		return err
	}
	return nil
}

func (s MQSession) Close() {
	if s.isConnected {
		s.MQChannel.Close()
		s.MQConnection.Close()
		s.isConnected = false
	}
	return
}