RabbitMq如何做到訊息的可靠性投遞

package rabbitmq
import (
	"encoding/json"
	"github.com/streadway/amqp"
	"log"
)
// RabbitMQ RabbitMQ結構
type RabbitMQ struct {
	channel  *amqp.Channel
	Name     string
	exchange string
}
// Connect 連線伺服器
func Connect(s string) *RabbitMQ {
	//連線rabbitmq
	conn, e := amqp.Dial(s)
	failOnError(e, "連線Rabbitmq伺服器失敗！")
	ch, e := conn.Channel()
	failOnError(e, "無法開啟頻道！")
	mq := new(RabbitMQ)
	mq.channel = ch
	return mq
}
// New 初始化訊息佇列
//第一個引數：rabbitmq伺服器的連結，第二個引數：佇列名字
func New(s string, name string) *RabbitMQ {
	//連線rabbitmq
	conn, e := amqp.Dial(s)
	failOnError(e, "連線Rabbitmq伺服器失敗！")
	ch, e := conn.Channel()
	failOnError(e, "無法開啟頻道！")
	q, e := ch.QueueDeclare(
		name,  //佇列名
		false, //是否開啟持久化
		true,  //不使用時刪除
		false, //排他
		false, //不等待
		nil,   //引數
	)
	failOnError(e, "初始化訊息佇列失敗！")
	mq := new(RabbitMQ)
	mq.channel = ch
	mq.Name = q.Name
	return mq
}
// QueueDeclare 宣告queue
func (q *RabbitMQ) QueueDeclare(queue string) {
	_, e := q.channel.QueueDeclare(queue, false, true, false, false, nil)
	failOnError(e, "宣告queue失敗！")
}
// QueueDelete 刪除queue
func (q *RabbitMQ) QueueDelete(queue string) {
	_, e := q.channel.QueueDelete(queue, false, true, false)
	failOnError(e, "刪除queue失敗！")
}
// Qos 設定queue引數
func (q *RabbitMQ) Qos() {
	e := q.channel.Qos(1, 0, false)
	failOnError(e, "無法設定QoS")
}
// NewExchange 初始化交換機
//第一個引數：rabbitmq伺服器的連結，第二個引數：交換機名字，第三個引數：交換機型別
func NewExchange(s string, name string, typename string) {
	//連線rabbitmq
	conn, e := amqp.Dial(s)
	failOnError(e, "連線Rabbitmq伺服器失敗！")
	ch, e := conn.Channel()
	failOnError(e, "無法開啟頻道！")
	e = ch.ExchangeDeclare(
		name,     // name
		typename, // type
		true,     // durable
		false,    // auto-deleted
		false,    // internal
		false,    // no-wait
		nil,      // arguments
	)
	failOnError(e, "初始化交換機失敗！")
}
// ExchangeDelete 刪除交換機
func (q *RabbitMQ) ExchangeDelete(exchange string) {
	e := q.channel.ExchangeDelete(exchange, false, true)
	failOnError(e, "刪除交換機失敗！")
}
// Bind 繫結訊息佇列到exchange
func (q *RabbitMQ) Bind(exchange string, key string) {
	e := q.channel.QueueBind(
		q.Name,
		key,
		exchange,
		false,
		nil,
	)
	failOnError(e, "繫結佇列失敗！")
	q.exchange = exchange
}
// Send 向訊息佇列傳送訊息
//Send方法可以往某個訊息佇列傳送訊息
func (q *RabbitMQ) Send(queue string, body interface{}) {
	str, e := json.Marshal(body)
	failOnError(e, "訊息序列化失敗！")
	e = q.channel.Publish(
		"",    //交換
		queue, //路由鍵
		false, //必填
		false, //立即
		amqp.Publishing{
			ReplyTo: q.Name,
			Body:    []byte(str),
		})
	msg := "向佇列:" + q.Name + "傳送訊息失敗！"
	failOnError(e, msg)
}
// Publish 向exchange傳送訊息
//Publish方法可以往某個exchange傳送訊息
func (q *RabbitMQ) Publish(exchange string, body interface{}, key string) {
	str, e := json.Marshal(body)
	failOnError(e, "訊息序列化失敗！")
	e = q.channel.Publish(
		exchange,
		key,
		false,
		false,
		amqp.Publishing{ReplyTo: q.Name,
			Body: []byte(str)},
	)
	failOnError(e, "向交換機傳送訊息失敗！")
}
// Consume 接收某個訊息佇列的訊息
func (q *RabbitMQ) Consume() <-chan amqp.Delivery {
	c, e := q.channel.Consume(
		q.Name, //指定從哪個佇列中接收訊息
		"",
		true,
		false,
		false,
		false,
		nil,
	)
	failOnError(e, "接收訊息失敗！")
	return c
}
// Close 關閉佇列連線
func (q *RabbitMQ) Close() {
	q.channel.Close()
}
//錯誤處理常式
func failOnError(err error, msg string) {
	if err != nil {
		log.Fatalf("%s: %s", msg, err)
	}
}

func New(s string, name string) *RabbitMQ {
	conn, e := amqp.Dial(s)
	failOnError(e, "連線Rabbitmq伺服器失敗！")
	ch, e := conn.Channel()
	failOnError(e, "無法開啟頻道！")
	q, e := ch.QueueDeclare(
		name,  //佇列名
		false, //是否開啟持久化
		true,  //不使用時刪除
		false, //排他
		false, //不等待
		nil,   //引數
	)
	failOnError(e, "初始化訊息佇列失敗！")
	mq := new(RabbitMQ)
	mq.channel = ch
	mq.Name = q.Name
	// 設定為confirm模式
	mq.channel.Confirm(false)
	return mq
}

func (q *RabbitMQ) ConfirmFromBroker(ch chan amqp.Confirmation) chan amqp.Confirmation {
	return q.channel.NotifyPublish(ch)
}

func main() {
	producer := rabbitmq.New("amqp://guest:guest@35.76.111.125:5672/", "queue")
	// 指定為topic型別
	rabbitmq.NewExchange("amqp://guest:guest@35.76.111.125:5672/", "exchange1", "fanout")
	confirm := producer.ConfirmFromBroker(make(chan amqp.Confirmation))
	go handleConfirm(confirm)
	var i int
	for {
		time.Sleep(time.Second)
		producer.Publish("exchange1", "fanout message: "+strconv.Itoa(i), "")
		i++
	}
}
func handleConfirm(confirm <-chan amqp.Confirmation) {
	for {
		select {
		case message := <-confirm:
			fmt.Println("接收到來自Broker的回覆：", message)
		}
	}
}

// Consume 接收某個訊息佇列的訊息
func (q *RabbitMQ) Consume() <-chan amqp.Delivery {
	c, e := q.channel.Consume(
		q.Name,
		"",
		false, // 不自動確認訊息
		false,
		false,
		false,
		nil,
	)
	failOnError(e, "接收訊息失敗！")
	return c
}

// Qos 設定queue引數
func (q *RabbitMQ) Qos() {
	e := q.channel.Qos(1, 0, false)
	failOnError(e, "無法設定QoS")
}

func main() {
	producer := rabbitmq.New("amqp://guest:guest@35.76.111.125:5672/", "queue")
	// 指定為direct型別
	rabbitmq.NewExchange("amqp://guest:guest@35.76.111.125:5672/", "exchange", "direct")
	i := 0
	for {
		time.Sleep(time.Second)
		producer.Publish("exchange", "routing message: "+strconv.Itoa(i), "key1")
		i = i + 1
	}
}

func main() {
	//第一個引數指定rabbitmq伺服器的連結，第二個引數指定建立佇列的名字
	consumer1 := rabbitmq.New("amqp://guest:guest@35.76.111.125:5672/", "queue1")
	// 指定一次只消費一條訊息，直到消費完才重新接收
	consumer1.Qos()
	// 佇列繫結到exchange
	consumer1.Bind("exchange", "key1")
	//接收訊息
	msgs := consumer1.Consume()
	go func() {
		var i int
		for d := range msgs {
			time.Sleep(time.Second * 1)
			log.Printf("Consumer1 received a message: %s", d.Body)
			// 假設消費第三條訊息的時候出現了錯誤，我們就呼叫d.Reject(true)，佇列會重新傳送訊息給消費者
			if i == 2 {
				d.Reject(true)
			} else {
				// 訊息消費成功之後就回復
				d.Ack(false)
			}
			i++
		}
	}()
	select {}
}

func main() {
	//第一個引數指定rabbitmq伺服器的連結，第二個引數指定建立佇列的名字
	consumer2 := rabbitmq.New("amqp://guest:guest@35.76.111.125:5672/", "queue1")
	// 指定一次只消費一條訊息，直到消費完才重新接收
	consumer2.Qos()
	// 佇列繫結到exchange
	consumer2.Bind("exchange", "key1")
	//接收訊息
	msgs := consumer2.Consume()
	go func() {
		for d := range msgs {
			time.Sleep(time.Second * 5)
			log.Printf("Consumer2 received a message: %s", d.Body)
			// 訊息消費成功之後就回復
			d.Ack(false)
		}
	}()
	select {}
}