rabbitMq 交换机介绍 系列四 Topic [golang 版本]

4种不同的交换机类型

直连交换机：Direct exchange
扇形交换机：Fanout exchange
主题交换机：Topic exchange
首部交换机：Headers exchange

交换机具体含义参考 https://www.jianshu.com/p/469...

Topic 交换机

以下代码参数具体含义可以参考 https://segmentfault.com/a/11...

Demo

生产者示例 producer.go

package main

import (
    "fmt"
    "github.com/streadway/amqp"
    "time"
)

//因：快速实现逻辑，故：不处理错误逻辑
func main() {
    conn, _ := amqp.Dial("amqp://user:password@host:ip/vhost")
    ch, _ := conn.Channel()
    body := "Hello World! " + time.Now().Format("2006-01-02 15:04:05")
    fmt.Println(body)
    var exchange_name string = "j_exch_topic"
    var routing_key string = "jkey.a.b"
    var etype string = amqp.ExchangeTopic
    //声明交换器
    ch.ExchangeDeclare(exchange_name, etype, true, false, false, false, nil)
    // fanout
    ch.Publish(
        exchange_name, // exchange 这里为空则不选择 exchange
        routing_key,   // routing key
        false,         // mandatory
        false,         // immediate
        amqp.Publishing{
            ContentType: "text/plain",
            Body:        []byte(body),
            //Expiration:  "3000", // 设置过期时间
        })

    // defer 关键字
    defer conn.Close() // 压栈 后进先出
    defer ch.Close()   // 压栈 后进先出

}

$ go run producer.go
Hello World! 2021-03-18 16:08:13

消费者示例 consumer.go

package main

import (
    "github.com/streadway/amqp"
    "log"
)

func main() {
    conn, _ := amqp.Dial("amqp://user:password@host:ip/vhost")
    ch, _ := conn.Channel()
    var exchange_name string = "j_exch_topic"
    var routing_key string = "jkey.#"
    var queue_name string = "j_queue"
    var etype string = amqp.ExchangeTopic // 主题交换机

    ch.QueueDeclare(queue_name, true, false, true, false, nil)
    //声明交换器 amqp.ExchangeFanout
    ch.ExchangeDeclare(exchange_name, etype, true, false, false, false, nil)

    ch.QueueBind(
        queue_name,    // queue name
        routing_key,   // routing key: topic 匹配jkey.#
        exchange_name, // exchange
        false,
        nil)

    //监听
    msgs, _ := ch.Consume(
        queue_name, // queue name
        "",         // consumer
        true,       // auto-ack
        false,      // exclusive
        false,      // no-local
        false,      // no-wait
        nil,        // args
    )

    forever := make(chan bool)

    go func() {
        for d := range msgs {
            //println("tset")
            log.Printf(" [x] %s", d.Body)
        }
    }()

    log.Printf(" [*] Waiting for logs. To exit press CTRL+C")
    <-forever
}

$ go run consumer.go
2021/03/18 15:52:30  [*] Waiting for logs. To exit press CTRL+C
2021/03/18 15:52:34  [x] Hello World! 2021-03-18 15:52:34
2021/03/18 15:53:14  [x] Hello World! 2021-03-18 15:53:14
2021/03/18 16:08:13  [x] Hello World! 2021-03-18 16:08:13

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