golang操作RabbitMQ--订阅模式

创建连接及RabbitMQ结构体实例代码见 https://www.cnblogs.com/prince5460/p/11895844.html

1.创建RabbitMQ订阅模式实例

func NewRabbitMQPubSub(exchangeName string) *RabbitMQ {
    //创建RabbitMQ实例
    rabbitmq := NewRabbitMQ("", exchangeName, "")
    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
}

2.生产者

func (r *RabbitMQ) PublishPub(message string) {
    //1.尝试创建交换机
    err := r.channel.ExchangeDeclare(
        r.Exchange,
        //订阅模式下为广播类型
        "fanout",
        true,
        false,
        //true表示这个exchange不可以被client用来推送消息,仅用来进行exchange和exchange之间的绑定
        false,
        false,
        nil,
    )
    r.failOnErr(err, "Failed to declare an exchange!")

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

3.消费者

func (r *RabbitMQ) ReceiveSub() {
    //1.试探性创建交换机
    err := r.channel.ExchangeDeclare(
        r.Exchange,
        //交换机类型
        "fanout",
        true,
        false,
        //true表示这个exchange不可以被client用来推送消息,仅用来进行exchange和exchange之间的绑定
        false,
        false,
        nil,
    )
    r.failOnErr(err, "Failed to declare an exchange!")

    //2.试探性创建队列,注意队列名称不要写
    q, err := r.channel.QueueDeclare(
        "", //随机生成队列名称
        false,
        false,
        true,
        false,
        nil,
    )
    r.failOnErr(err, "Failed to declare an exchange!")

    //3.绑定队列到exchange中
    err = r.channel.QueueBind(
        q.Name,
        //在pub/sub模式下,这里的key要为空
        "",
        r.Exchange,
        false,
        nil,
    )

    //4.消费消息
    messages, err := r.channel.Consume(
        q.Name,
        "",
        true,
        false,
        false,
        false,
        nil,
    )

    forever := make(chan bool)

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

    fmt.Println("[*] Waiting for messages,To exit press CTRL+C")
    <-forever
}

4.测试代码

• Publish

package main

import (
    "fmt"
    "go-rabbitmq/RabbitMQ"
    "strconv"
    "time"
)

func main() {
    rabbitmq := RabbitMQ.NewRabbitMQPubSub("newProduct")

    for i := 0; i <= 100; i++ {
        rabbitmq.PublishPub("订阅模式生产第" + strconv.Itoa(i) + "条数据")
        fmt.Println("订阅模式生产第" + strconv.Itoa(i) + "条数据")
        time.Sleep(time.Second)
    }
}

• Subscribe1

package main

import "go-rabbitmq/RabbitMQ"

func main() {
    rabbitmq := RabbitMQ.NewRabbitMQPubSub("newProduct")
    rabbitmq.ReceiveSub()
}

• Subscribe2

package main

import "go-rabbitmq/RabbitMQ"

func main() {
    rabbitmq := RabbitMQ.NewRabbitMQPubSub("newProduct")
    rabbitmq.ReceiveSub()
}