RabbitMq如何做到消息的可靠性投递

package rabbitmq
import (
	"encoding/JSON"
	"github.com/streadway/amqp"
	"log"
)
// RabbitMQ RabbitMQ结构
type RabbitMQ struct {
	channel  *amqp.Channel
	Name     string
	exchange string
}
// Connect 连接服务器
func Connect(s string) *RabbitMQ {
	//连接rabbitmq
	conn, e := amqp.Dial(s)
	failOnError(e, "连接Rabbitmq服务器失败！")
	ch, e := conn.Channel()
	failOnError(e, "无法打开频道！")
	mq := new(RabbitMQ)
	mq.channel = ch
	return mq
}
// New 初始化消息队列
//第一个参数：rabbitmq服务器的链接，第二个参数：队列名字
func New(s string, name string) *RabbitMQ {
	//连接rabbitmq
	conn, e := amqp.Dial(s)
	failOnError(e, "连接Rabbitmq服务器失败！")
	ch, e := conn.Channel()
	failOnError(e, "无法打开频道！")
	q, e := ch.QueueDeclare(
		name,  //队列名
		false, //是否开启持久化
		true,  //不使用时删除
		false, //排他
		false, //不等待
		nil,   //参数
	)
	failOnError(e, "初始化消息队列失败！")
	mq := new(RabbitMQ)
	mq.channel = ch
	mq.Name = q.Name
	return mq
}
// QueueDeclare 声明queue
func (q *RabbitMQ) QueueDeclare(queue string) {
	_, e := q.channel.QueueDeclare(queue, false, true, false, false, nil)
	failOnError(e, "声明queue失败！")
}
// QueueDelete 删除queue
func (q *RabbitMQ) QueueDelete(queue string) {
	_, e := q.channel.QueueDelete(queue, false, true, false)
	failOnError(e, "删除queue失败！")
}
// Qos 配置queue参数
func (q *RabbitMQ) Qos() {
	e := q.channel.Qos(1, 0, false)
	failOnError(e, "无法设置QoS")
}
// NewExchange 初始化交换机
//第一个参数：rabbitmq服务器的链接，第二个参数：交换机名字，第三个参数：交换机类型
func NewExchange(s string, name string, typename string) {
	//连接rabbitmq
	conn, e := amqp.Dial(s)
	failOnError(e, "连接Rabbitmq服务器失败！")
	ch, e := conn.Channel()
	failOnError(e, "无法打开频道！")
	e = ch.ExchangeDeclare(
		name,     // name
		typename, // type
		true,     // durable
		false,    // auto-deleted
		false,    // internal
		false,    // no-wait
		nil,      // arguments
	)
	failOnError(e, "初始化交换机失败！")
}
// ExchangeDelete 删除交换机
func (q *RabbitMQ) ExchangeDelete(exchange string) {
	e := q.channel.ExchangeDelete(exchange, false, true)
	failOnError(e, "删除交换机失败！")
}
// Bind 绑定消息队列到exchange
func (q *RabbitMQ) Bind(exchange string, key string) {
	e := q.channel.QueueBind(
		q.Name,
		key,
		exchange,
		false,
		nil,
	)
	failOnError(e, "绑定队列失败！")
	q.exchange = exchange
}
// Send 向消息队列发送消息
//Send方法可以往某个消息队列发送消息
func (q *RabbitMQ) Send(queue string, body interface{}) {
	str, e := json.Marshal(body)
	failOnError(e, "消息序列化失败！")
	e = q.channel.Publish(
		"",    //交换
		queue, //路由键
		false, //必填
		false, //立即
		amqp.Publishing{
			ReplyTo: q.Name,
			Body:    []byte(str),
		})
	msg := "向队列:" + q.Name + "发送消息失败！"
	failOnError(e, msg)
}
// Publish 向exchange发送消息
//Publish方法可以往某个exchange发送消息
func (q *RabbitMQ) Publish(exchange string, body interface{}, key string) {
	str, e := json.Marshal(body)
	failOnError(e, "消息序列化失败！")
	e = q.channel.Publish(
		exchange,
		key,
		false,
		false,
		amqp.Publishing{ReplyTo: q.Name,
			Body: []byte(str)},
	)
	failOnError(e, "向交换机发送消息失败！")
}
// Consume 接收某个消息队列的消息
func (q *RabbitMQ) Consume() <-chan amqp.Delivery {
	c, e := q.channel.Consume(
		q.Name, //指定从哪个队列中接收消息
		"",
		true,
		false,
		false,
		false,
		nil,
	)
	failOnError(e, "接收消息失败！")
	return c
}
// Close 关闭队列连接
func (q *RabbitMQ) Close() {
	q.channel.Close()
}
//错误处理函数
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, "连接Rabbitmq服务器失败！")
	ch, e := conn.Channel()
	failOnError(e, "无法打开频道！")
	q, e := ch.QueueDeclare(
		name,  //队列名
		false, //是否开启持久化
		true,  //不使用时删除
		false, //排他
		false, //不等待
		nil,   //参数
	)
	failOnError(e, "初始化消息队列失败！")
	mq := new(RabbitMQ)
	mq.channel = ch
	mq.Name = q.Name
	// 设置为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")
	// 指定为topic类型
	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("接收到来自Broker的回复：", message)
		}
	}
}

// Consume 接收某个消息队列的消息
func (q *RabbitMQ) Consume() <-chan amqp.Delivery {
	c, e := q.channel.Consume(
		q.Name,
		"",
		false, // 不自动确认消息
		false,
		false,
		false,
		nil,
	)
	failOnError(e, "接收消息失败！")
	return c
}

// Qos 配置queue参数
func (q *RabbitMQ) Qos() {
	e := q.channel.Qos(1, 0, false)
	failOnError(e, "无法设置QoS")
}

func main() {
	producer := rabbitmq.New("amqp://guest:guest@35.76.111.125:5672/", "queue")
	// 指定为direct类型
	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() {
	//第一个参数指定rabbitmq服务器的链接，第二个参数指定创建队列的名字
	consumer1 := rabbitmq.New("amqp://guest:guest@35.76.111.125:5672/", "queue1")
	// 指定一次只消费一条消息，直到消费完才重新接收
	consumer1.Qos()
	// 队列绑定到exchange
	consumer1.Bind("exchange", "key1")
	//接收消息
	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)
			// 假设消费第三条消息的时候出现了错误，我们就调用d.Reject(true)，队列会重新发送消息给消费者
			if i == 2 {
				d.Reject(true)
			} else {
				// 消息消费成功之后就回复
				d.Ack(false)
			}
			i++
		}
	}()
	select {}
}

func main() {
	//第一个参数指定rabbitmq服务器的链接，第二个参数指定创建队列的名字
	consumer2 := rabbitmq.New("amqp://guest:guest@35.76.111.125:5672/", "queue1")
	// 指定一次只消费一条消息，直到消费完才重新接收
	consumer2.Qos()
	// 队列绑定到exchange
	consumer2.Bind("exchange", "key1")
	//接收消息
	msgs := consumer2.Consume()
	go func() {
		for d := range msgs {
			time.Sleep(time.Second * 5)
			log.Printf("Consumer2 received a message: %s", d.Body)
			// 消息消费成功之后就回复
			d.Ack(false)
		}
	}()
	select {}
}