如何从AMQP(RabbitMQ)队列中删除消息?

这是事情。

我正在使用PHP AMQP从Rabbitmq读取结果队列,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,以便处理队列中的所有邮件,因此完成后,多个邮件在这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,因为它会在脚本运行期间删除未处理的脚本。

这让我只有一个选择。 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();
?>

在成功处理后确认消息$queue->ack() ,甚至通过AMQP_AUTOACK标志消耗/获取它们。

UPD:

根据你的代码:

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

PS:

检查AMQPQueue :: consume文档,看起来在这里更适合。

3.处理完毕后,您可以使用并查看消息:
$queue->consume(function ($envelope, $queue) {
        process_message($envelope->getBody());
        $queue->ack($envelope->getDeliveryTag());
});
4.或使用AMQP_AUTOACK标志消耗,但是当处理失败时,将无法再处理消息:
$queue->consume(function ($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。

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