rabbitmq延时重试队列

如果只是网络抖动 出现异常那么直接进入死信队列 那么是不合理的

这就可以使用延时重试队列

原理：

1.发送到业务队里 如果正常收到 正常运行

2.如果处理失败 重试  并投入延时队列 如果超过延时时间 重新投入业务队列

3.如果重试次数大于3 那么进入死信队列

搭建代码框架
创建测试项目的目录 mq
从 https://github.com/php-amqplib/php-amqplib 下载AMQP库（当然也可以通过 composer 安装，这里为了简单直接自己处理了），放入 mq 目录
编写 index.php，实现自动加载
创建 test 目录，编写生产者和消费者
跑脚本：
开启生产者：php -f index.php retryP p
开启消费者：php -f index.php retryC c
代码结构
├─PhpAmqpLib
│ ├─Channel
│ ├─Connection
│ ├─Exception
│ ├─Exchange
│ ├─Helper
│ │ └─Protocol
│ ├─Message
│ └─Wire
│ └─IO
├─test
│ ├─retryP.php
│ └─retryC.php
└─index.php

代码
index.php
<?php

function my_autoloader($cName) {
include(__DIR__."/".$cName.".php");
}

spl_autoload_register("my_autoloader");

if (isset($argv[2])) {
$cname = '\test\\'.$argv[1];
if (!class_exists($cname)) {
exit("class (".$cname.") not exists".PHP_EOL);
}
$c = new $cname();
if (!method_exists($c, $argv[2])) {
exit("method (".$argv[2].") not exists".PHP_EOL);
}
if (isset($argv[3])) {
call_user_func(array($c, $argv[2]), $argv[3]);
} else {
call_user_func(array($c, $argv[2]));
}
} else if (isset($argv[1])) {
if (!function_exists($argv[1])) {
exit("function (".$argv[1].") not exists".PHP_EOL);
}
$argv[1]();
} else {
exit("please input at least one argument".PHP_EOL);
}

生产者
<?php

namespace test;

use PhpAmqpLib\Connection\AMQPStreamConnection;
use PhpAmqpLib\Message\AMQPMessage;
use PhpAmqpLib\Wire\AMQPTable;

class retryP {
private $host = 'localhost';
private $port = 5672;
private $user = 'guest';
private $password = 'guest';

// 可能丢失
public function p() {
$connection = new AMQPStreamConnection($this->host, $this->port, $this->user, $this->password, '/', false, 'AMQPLAIN', null, 'en_US', 3.0, 120.0, null, true, 60);
$channel = $connection->channel();

$channel->exchange_declare('retry.retryExchange', 'direct', false, true, false, false);

$channel->queue_declare('retry.normalQueue', false, true, false, false); // retryQueue 的死信队列，由消费者订阅
$channel->queue_declare('retry.retryQueue', false, true, false, false, false, new AMQPTable(
[
'x-dead-letter-exchange' => 'retry.retryExchange',
'x-dead-letter-routing-key' => 'normal',
'x-message-ttl' => 3 * 1000
]
)); // retryQueue 没有消费者，超时后发到死信队列
$channel->queue_declare('retry.failQueue', false, true, false, false); // 超过重试次数，人工处理

$channel->queue_bind('retry.retryQueue', 'retry.retryExchange', 'retry');
$channel->queue_bind('retry.normalQueue', 'retry.retryExchange', 'normal');
$channel->queue_bind('retry.failQueue', 'retry.retryExchange', 'fail');

// 准备消息
$msg = new AMQPMessage(json_encode(["data"=>"something", "retryTime"=>1]));
$channel->basic_publish($msg, 'retry.retryExchange', 'normal');
echo "basic_publish success";

$channel->close();
$connection->close();
}
}

消费者
<?php

namespace test;

use PhpAmqpLib\Connection\AMQPStreamConnection;
use PhpAmqpLib\Message\AMQPMessage;
use PhpAmqpLib\Wire\AMQPTable;

class retryC {
private $host = 'localhost';
private $port = 5672;
private $user = 'guest';
private $password = 'guest';

private $connection;
private $channel;

public function __construct() {
$this->connection = new AMQPStreamConnection($this->host, $this->port, $this->user, $this->password, '/', false, 'AMQPLAIN', null, 'en_US', 3.0, 120.0, null, true, 60);
$this->channel = $this->connection->channel();
}

// 正常队列
public function c() {
//闭包回调函数
$callback = function ($msg) {
echo $msg->body;
echo PHP_EOL;
$data = json_decode($msg->body, true);
// 超过重试次数，放入死信队列
if ($data["retryTime"] > 3) {
$msg->delivery_info['channel']->basic_publish($msg, 'retry.retryExchange', 'fail');
echo "retryTime > 3, fail" . PHP_EOL;
}
// 消费消息，进行业务处理
$msg->delivery_info['channel']->basic_ack($msg->delivery_info['delivery_tag']);
// 业务处理失败，向 retryQueue 发消息
$msgNew = new AMQPMessage(json_encode(["data"=>$data["data"], "retryTime"=>$data["retryTime"]+1]));
$msg->delivery_info['channel']->basic_publish($msgNew, 'retry.retryExchange', 'retry');
};
$this->channel->basic_qos(null, 1, null);
$this->channel->basic_consume('retry.normalQueue', '', false, false, false, false, $callback); // 需要手动确认

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