centos 下安裝RabbmitMQ+PHP RabbmitMQ應用

你或許在思考數據分發、無阻塞做業或者消息推送。或者你想要進行發佈/訂閱，異步任務，工做隊列。全部的這些模式，都是消息隊列的一部分。

1.安裝RabbmitMQ

wget https://www.rabbitmq.com/releases/rabbitmq-server/v3.6.8/rabbitmq-server-3.6.8-1.el6.noarch.rpm

獲取rpm ,安裝的時候會發現缺乏依賴

安裝依賴erlang

wget https://packages.erlang-solutions.com/erlang-solutions-1.0-1.noarch.rpm
rpm -Uvh erlang-solutions-1.0-1.noarch.rpm
yum install erlang

注意不要用epel的源直接yum安裝，epel源的erlang版本過低
安裝依賴socat

yum install socat

最後

rpm -Uvh rabbitmq-server-3.6.8-1.el6.noarch.rpm

2.php的RabbmitMQ庫

{
  "require": {
      "php-amqplib/php-amqplib": "2.6.*"
  }
}

comoser install

3.php+RabbmitMQ helloworld

//send.php
require_once __DIR__ . '/vendor/autoload.php';
use PhpAmqpLib\Connection\AMQPStreamConnection;
use PhpAmqpLib\Message\AMQPMessage;
$connection = new AMQPStreamConnection('localhost', 5672, 'guest', 'guest');
$channel = $connection->channel();
$channel->queue_declare('hello', false, false, false, false);

$msg = new AMQPMessage('Hello World!');
$channel->basic_publish($msg, '', 'hello'); //發送一個消息到hello頻道

echo " [x] Sent 'Hello World!'\n";
$channel->close();
$connection->close();

//receive.php
require_once __DIR__ . '/vendor/autoload.php';
use PhpAmqpLib\Connection\AMQPStreamConnection;
$connection = new AMQPStreamConnection('localhost', 5672, 'guest', 'guest');
$channel = $connection->channel();

$channel->queue_declare('hello', false, false, false, false);

echo ' [*] Waiting for messages. To exit press CTRL+C', "\n";
$callback = function($msg) {
  echo " [x] Received ", $msg->body, "\n";
};

//接收hello頻道的消息
$channel->basic_consume('hello', '', false, true, false, false, $callback);

while(count($channel->callbacks)) {
    $channel->wait();
}

4.運行

首先運行起來rabbmitMQ server

service rabbmitmq-server start

掛起receive.php接收消息處理

php receive.php

發送消息

##另起一個窗口執行
php send.php

以上代碼就構建了一個簡單的消息隊列

消息從send.php 生產(p) 進入隊列 交由 消費者(c)

注意:當關閉了命令行窗口receive.php 進程將會結束，這個時候就須要藉助
supservisor 來將receive.php 腳本後臺運行。這部分代碼能夠改寫應用做簡單的異步隊列任務的場景，但到了高併發高可用需求下就要進行額外的一些處理。在以後的文章中我會講到rabbmitMQ的競爭消費模式和superverisor的用法。