如何从AMQP（RabbitMQ）队列中删除消息？

Question

这就是事情。

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上的重要信息。完成后，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，不会得到已处理的消息。

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分钟内会发送数百条新消息。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。标记或删除刚刚被我的AMQP脚本处理或读取的消息。

有办法吗？（以下是脚本）

<?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();
?>

Answer 1

确认消息$queu-

UPD：

根据您的代码：

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

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

附笔。：

查看AMQPQueue:：consume文档，看起来它更适合这里。

$queue->consume(function ($envelope, $queue) {
        process_message($envelope->getBody());
        $queue->ack($envelope->getDeliveryTag());
});

$queue->consume(function ($envelope, $queue) {
        process_message($envelope->getBody());
        $queue->ack($envelope->getDeliveryTag());
}, AMQP_AUTOACK);

结论：我建议使用#3溶液，但这取决于你。