如何从AMQP(RabbitMQ)队列中删除消息?

时间:2013-07-25 12:03:08

标签: php queue rabbitmq amqp mail-server

这就是事情。

我正在使用PHP AMQP从Rabbitmq读取结果队列,以便处理每封发送的电子邮件的重要信息。完成此操作后,我需要将该消息删除或标记为已写入,以便下次读取队列时,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,每次我读取队列来处理结果发送时,脚本可以运行至少5分钟,以便处理队列中的所有消息,所以在它之后完成后,在这5分钟内有数百条新消息。这使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消息。

这让我只有一个选择。在我的AMQP脚本处理或读取之后标记或删除消息。

有办法吗? (这是脚本)

<?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();
?>

1 个答案:

答案 0 :(得分:3)

成功处理后确认消息$queue->ack(),甚至使用AMQP_AUTOACK标记消费/获取消息。

<强> UPD:

根据您的代码:

1.确认消息
while ($envelope = $queue->get()) {
    //Function that processes the message
    process_message($envelope->getBody());
    $queue->ack($envelope->getDeliveryTag());
}
2.获得AMQP_AUTOACK标志:
while ($envelope = $queue->get(AMQP_AUTOACK)) {
    //Function that processes the message
    process_message($envelope->getBody());
}

<强> P.S:

查看AMQPQueue::consume文档,看起来更合适。

3.处理后可以使用消息和确认消息:
$queue->consume(function ($envelope, $queue) {
        process_message($envelope->getBody());
        $queue->ack($envelope->getDeliveryTag());
});
4.或者使用AMQP_AUTOACK标志,但是当处理失败时,您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:我建议使用#3解决方案,但这取决于你。