2013-07-25 695 views
1

这是事情。如何从AMQP(RabbitMQ)队列中删除消息?

我从RabbitMQ的为了处理上发送每封电子邮件的重要信息使用PHP AMQP读取结果队列。完成后,我需要删除或标记为已写入的消息,以便下次读队列时我不会收到已处理的消息。

由于Rabbitmq服务器每小时发送超过10,000封电子邮件,每当我读取队列以处理结果发送时,脚本可以运行至少5分钟以处理队列中的所有邮件,所以在它之后已经完成,在这5分钟内有数百个新消息被放置。这使得我无法在脚本完成后清除队列,因为它会在脚本运行期间删除未处理的脚本。

这给我留下了只有一个选择。在AMQP脚本处理或读取之后立即标记或删除消息。

有没有办法做到这一点? (这里是脚本)

<?php 
/** 
* result.php 
* Script that connects to RabbitMQ, and takes the result message from 
* the result message queue. 
*/ 

// include the settings 
require_once('settings.php'); 

// try to set up a connection to the RabbitMQ server 
try 
{ 
    // construct the connection to the RabbitMQ server 
    $connection = new AMQPConnection(array(
     'host'  => $hostname, 
     'login'  => $username, 
     'password' => $password, 
     'vhost'  => $vhost 
    )); 

    // connect to the RabbitMQ server 
    $connection->connect(); 
} 
catch (AMQPException $exception) 
{ 
    echo "Could not establish a connection to the RabbitMQ server.\n"; 
} 

// try to create the channel 
try 
{ 
    // open the channel 
    $channel = new AMQPChannel($connection); 
} 
catch (AMQPConnectionException $exception) 
{ 
    echo "Connection to the broker was lost (creating channel).\n"; 
} 

// try to create the queue 
try 
{ 
    // create the queue and bind the exchange 
    $queue = new AMQPQueue($channel); 
    $queue->setName($resultbox); 
    $queue->setFlags(AMQP_DURABLE); 
    $queue->bind('exchange1', 'key1'); 
    $queue->declare(); 
} 
catch (AMQPQueueException $exception) 
{ 
    echo "Channel is not connected to a broker (creating queue).\n"; 
} 
catch (AMQPConnectionException $exception) 
{ 
    echo "Connection to the broker was lost. (creating queue)/\n"; 
} 

// Get the message from the queue. 
while ($envelope = $queue->get()) { 
    //Function that processes the message 
    process_message($envelope->getBody()); 
} 
    $queue->purge(); 

// done, close the connection to RabbitMQ 
$connection->disconnect(); 
?> 

回答

3

确认消息(S)$queue->ack()成功处理后,甚至消耗/与AMQP_AUTOACK标志得到他们。

UPD:

基于您的代码:

while ($envelope = $queue->get(AMQP_AUTOACK)) { 
    //Function that processes the message 
    process_message($envelope->getBody()); 
} 

PS:

1. Ack'ing消息
while ($envelope = $queue->get()) { 
    //Function that processes the message 
    process_message($envelope->getBody()); 
    $queue->ack($envelope->getDeliveryTag()); 
} 
2. AMQP_AUTOACK标志获取它

检查AMQPQueue::consume文档,看起来是更适合这里。

3.您可以使用和它被处理后,确认消息:
$queue->consume(function ($envelope, $queue) { 
     process_message($envelope->getBody()); 
     $queue->ack($envelope->getDeliveryTag()); 
}); 
4或 AMQP_AUTOACK标志消耗,但是当处理。第失败,你将无法再次处理消息:
$queue->consume(function ($envelope, $queue) { 
     process_message($envelope->getBody()); 
     $queue->ack($envelope->getDeliveryTag()); 
}, AMQP_AUTOACK); 

结论:我会推荐使用#3解决方案,但这取决于你。

+0

我如何能实现它的PHP代码?谢谢 – rodvela

+0

用代码更新了我的答案。我相信你已经阅读过,但以防万一,这里是官方文档http://php.net/manual/en/book.amqp.php,它在某些部分有些过时,但仍然很好理解如何使用php-amqp并且有一些你可能会觉得有用的例子 – pinepain

+0

ps看看这里的例子https://github.com/pinepain/amqpy/tree/master/demo/canonical – pinepain