Routing模式
2021.07

Routing模式(路由模式,一个消息被多个消费者获取,并且消息的目标队列可被生产者指定)

Routing模式

消息生产者将消息发送给交换机按照路由判断,路由是字符串(info) 当前产生的消息携带路由字符(对象的方法),交换机根据路由的key,只能匹配上路由key对应的消息队列,对应的消费者才能消费消息;根据业务功能定义路由字符串从系统的代码逻辑中获取对应的功能字符串,将消息任务扔到对应的队列中业务场景:error 通知;EXCEPTION;错误通知的功能;传统意义的错误通知;客户通知;利用key路由,可以将程序中的错误封装成消息传入到消息队列中,开发者可以自定义消费者,实时接收错误; 目录结构 Routing模式 kuteng-RabbitMQ -RabbitMQ –rabitmq.go //这个是RabbitMQ的封装 -publish –mainpublish.go //Publish 先启动 -recieve1 –mainrecieve.go -recieve2 –mainrecieve.go rabitmq.go代码

package RabbitMQ

import (
    "fmt"
    "log"

    "github.com/streadway/amqp"
)

//连接信息
const MQURL = "amqp://kuteng:kuteng@127.0.0.1:5672/kuteng"

//rabbitMQ结构体
type RabbitMQ struct {
    conn    *amqp.Connection
    channel *amqp.Channel
    //队列名称
    QueueName string
    //交换机名称
    Exchange string
    //bind Key 名称
    Key string
    //连接信息
    Mqurl string
}

//创建结构体实例
func NewRabbitMQ(queueName string, exchange string, key string) *RabbitMQ {
    return &RabbitMQ{QueueName: queueName, Exchange: exchange, Key: key, Mqurl: MQURL}
}

//断开channel 和 connection
func (r *RabbitMQ) Destory() {
    r.channel.Close()
    r.conn.Close()
}

//错误处理函数
func (r *RabbitMQ) failOnErr(err error, message string) {
    if err != nil {
        log.Fatalf("%s:%s", message, err)
        panic(fmt.Sprintf("%s:%s", message, err))
    }
}

//路由模式
//创建RabbitMQ实例
func NewRabbitMQRouting(exchangeName string, routingKey string) *RabbitMQ {
    //创建RabbitMQ实例
    rabbitmq := NewRabbitMQ("", exchangeName, routingKey)
    var err error
    //获取connection
    rabbitmq.conn, err = amqp.Dial(rabbitmq.Mqurl)
    rabbitmq.failOnErr(err, "failed to connect rabbitmq!")
    //获取channel
    rabbitmq.channel, err = rabbitmq.conn.Channel()
    rabbitmq.failOnErr(err, "failed to open a channel")
    return rabbitmq
}

//路由模式发送消息
func (r *RabbitMQ) PublishRouting(message string) {
    //1.尝试创建交换机
    err := r.channel.ExchangeDeclare(
        r.Exchange,
        //要改成direct
        "direct",
        true,
        false,
        false,
        false,
        nil,
    )

    r.failOnErr(err, "Failed to declare an excha"+
        "nge")

    //2.发送消息
    err = r.channel.Publish(
        r.Exchange,
        //要设置
        r.Key,
        false,
        false,
        amqp.Publishing{
            ContentType: "text/plain",
            Body:        []byte(message),
        })
}

//路由模式接受消息
func (r *RabbitMQ) RecieveRouting() {
    //1.试探性创建交换机
    err := r.channel.ExchangeDeclare(
        r.Exchange,
        //交换机类型
        "direct",
        true,
        false,
        false,
        false,
        nil,
    )
    r.failOnErr(err, "Failed to declare an exch"+
        "ange")
    //2.试探性创建队列,这里注意队列名称不要写
    q, err := r.channel.QueueDeclare(
        "", //随机生产队列名称
        false,
        false,
        true,
        false,
        nil,
    )
    r.failOnErr(err, "Failed to declare a queue")

    //绑定队列到 exchange 中
    err = r.channel.QueueBind(
        q.Name,
        //需要绑定key
        r.Key,
        r.Exchange,
        false,
        nil)

    //消费消息
    messges, err := r.channel.Consume(
        q.Name,
        "",
        true,
        false,
        false,
        false,
        nil,
    )

    forever := make(chan bool)

    go func() {
        for d := range messges {
            log.Printf("Received a message: %s", d.Body)
        }
    }()

    fmt.Println("退出请按 CTRL+C\n")
    <-forever
}

mainpublish.go代码

package main

import (
    "fmt"
    "strconv"
    "time"

    "github.com/student/kuteng-RabbitMQ/RabbitMQ"
)

func main() {
    kutengone := RabbitMQ.NewRabbitMQRouting("kuteng", "kuteng_one")
    kutengtwo := RabbitMQ.NewRabbitMQRouting("kuteng", "kuteng_two")
    for i := 0; i <= 100; i++ {
        kutengone.PublishRouting("Hello kuteng one!" + strconv.Itoa(i))
        kutengtwo.PublishRouting("Hello kuteng Two!" + strconv.Itoa(i))
        time.Sleep(1 * time.Second)
        fmt.Println(i)
    }

}

recieve1/mainrecieve.go代码

package main

import "github.com/student/kuteng-RabbitMQ/RabbitMQ"

func main() {
    kutengone := RabbitMQ.NewRabbitMQRouting("kuteng", "kuteng_one")
    kutengone.RecieveRouting()
}

recieve2/mainrecieve.go代码

package main

import "github.com/student/kuteng-RabbitMQ/RabbitMQ"

func main() {
    kutengtwo := RabbitMQ.NewRabbitMQRouting("kuteng", "kuteng_two")
    kutengtwo.RecieveRouting()
}
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