(转）go rabbitmq实践

转载自：http://www.cnblogs.com/shi-meng/p/4800080.html

1:驱动

　　本来打算自己写一个驱动的，后来发现github上面已经有了，那我就直接拿现成的了，驱动采用 github.com/streadway/amqp ，直接import就可以啦！

2:exchange and queue

　　在上一篇文章中，我们已经创建好virtualhost 、exchange and queue，所以我们先定义这些常量

const (queueName = "push.msg.q"exchange  = "t.msg.ex"mqurl ="amqp://shi:123@192.168.232.130:5672/test"
)

var conn *amqp.Connectionvar channel *amqp.Channel

3：错误处理

func failOnErr(err error, msg string) {

if err != nil {

log.Fatalf("%s:%s", msg, err)

panic(fmt.Sprintf("%s:%s", msg, err))

}

4：连接mq

func mqConnect() {var err errorconn, err = amqp.Dial(mqurl)failOnErr(err, "failed to connect tp rabbitmq")channel, err = conn.Channel()failOnErr(err, "failed to open a channel")
}

5：push

　　先上代码：

func push() {if channel == nil {mqConnect()}msgContent := "hello world!"channel.Publish(exchange, queueName, false, false, amqp.Publishing{ContentType: "text/plain",Body:        []byte(msgContent),})
}

　　其实是很简单的，调用 channel函数的Publish方法，传入exchange name 和 queue name，最后一个参数是消息内容，ContentType我们设置为text/plain，为文本类型，body是消息内容，要传入字节数组，这样就完成了一条消息的push，接下来我们再看receive

6：receive

代码：

func receive() {if channel == nil {mqConnect()}msgs, err := channel.Consume(queueName, "", true, false, false, false, nil)failOnErr(err, "")forever := make(chan bool)go func() {//fmt.Println(*msgs)for d := range msgs {s := BytesToString(&(d.Body))count++fmt.Printf("receve msg is :%s -- %d\n", *s, count)}}()fmt.Printf(" [*] Waiting for messages. To exit press CTRL+C\n")<-forever
}

　　通过调用channel.Consume函数返回一个接受消息的chan类型管道，然后range 这个chan，接收到的数据是[]byte,转换为string后输出

　　<-forever 这个是为了控制当前线程不退出

7：入口main

func main() {go func() {for {push()time.Sleep(1 * time.Second)}}()receive()fmt.Println("end")close()
}

　　for 循环保证每秒发送一条消息到mq，这个地方采用协程保证不阻塞主线程。receive函数不能采用协程，不然主线程就退出了。close函数是释放连接对象，但是在这个例子中是没有起效的，因为线程永远都不会自动退出，只能认为的CTRL+C 或者程序死掉，系统重启

8：执行：

切换到go文件目录执行

go run main.go

//运行日志

receve msg is :hello world! -- 1246
receve msg is :hello world! -- 1247
receve msg is :hello world! -- 1248
receve msg is :hello world! -- 1249
receve msg is :hello world! -- 1250
receve msg is :hello world! -- 1251
receve msg is :hello world! -- 1252
receve msg is :hello world! -- 1253
receve msg is :hello world! -- 1254
receve msg is :hello world! -- 1255
receve msg is :hello world! -- 1256
receve msg is :hello world! -- 1257
receve msg is :hello world! -- 1258
receve msg is :hello world! -- 1259
receve msg is :hello world! -- 1260
receve msg is :hello world! -- 1261
receve msg is :hello world! -- 1262
receve msg is :hello world! -- 1263
receve msg is :hello world! -- 1264
receve msg is :hello world! -- 1265
receve msg is :hello world! -- 1266

9：全部代码

package mainimport ("fmt""log""bytes""time""github.com/streadway/amqp"
)var conn *amqp.Connection
var channel *amqp.Channel
var count = 0const (queueName = "push.msg.q"exchange  = "t.msg.ex"mqurl ="amqp://shi:123@192.168.232.130:5672/test"
)func main() {go func() {for {push()time.Sleep(1 * time.Second)}}()receive()fmt.Println("end")close()
}func failOnErr(err error, msg string) {if err != nil {log.Fatalf("%s:%s", msg, err)panic(fmt.Sprintf("%s:%s", msg, err))}
}func mqConnect() {var err errorconn, err = amqp.Dial(mqurl)failOnErr(err, "failed to connect tp rabbitmq")channel, err = conn.Channel()failOnErr(err, "failed to open a channel")
}func close() {channel.Close()conn.Close()
}//连接rabbitmq server
func push() {if channel == nil {mqConnect()}msgContent := "hello world!"channel.Publish(exchange, queueName, false, false, amqp.Publishing{ContentType: "text/plain",Body:        []byte(msgContent),})
}func receive() {if channel == nil {mqConnect()}msgs, err := channel.Consume(queueName, "", true, false, false, false, nil)failOnErr(err, "")forever := make(chan bool)go func() {//fmt.Println(*msgs)for d := range msgs {s := BytesToString(&(d.Body))count++fmt.Printf("receve msg is :%s -- %d\n", *s, count)}}()fmt.Printf(" [*] Waiting for messages. To exit press CTRL+C\n")<-forever
}func BytesToString(b *[]byte) *string {s := bytes.NewBuffer(*b)r := s.String()return &r
}

转载于:https://www.cnblogs.com/tianlongtc/p/8822946.html