如何从AMQP(RabbitMQ)队列中删除消息


How delete messages from an AMQP (RabbitMQ) queue?

事情就是这样。

我正在使用PHP AMQP读取Rabbitmq的结果队列,以便处理发送的每封电子邮件的重要信息。完成后,我需要删除该消息或将其标记为已写入,以便下次读取队列时不会收到已处理的消息。

由于Rabbitmq服务器每小时发送超过10000封电子邮件,每次我读取队列以处理结果发送时,脚本至少可以运行5分钟,以便处理队列中的所有消息,因此在完成后,在这5分钟内,有数百条新消息被放置。这使得我无法在脚本完成后清除队列,因为它会删除脚本运行期间未处理的消息位置。

这让我只有一个选择。在我的AMQP脚本处理或读取消息后,标记或删除消息。

有办法做到这一点吗?(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();
?>

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

UPD:

基于您的代码:

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

p.S.:

检查AMQPQueue::消费文档,看起来这里更合适。

3.您可以在处理后消费和确认消息:
$queue->consume(function ($envelope, $queue) {
        process_message($envelope->getBody());
        $queue->ack($envelope->getDeliveryTag());
});
4.或使用AMQP_AUTOACK标志消费,但当处理失败时,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,但这取决于您。