对php-amqplib使用确认(发布者确认)

Question

我正在尝试通过php-amqplib库来使用确认(Publisher Acknowledgements)，这是在http://rabbitmq.com/上推荐使用RabbitMQ和PHP的库。

代码本身没有很好的文档记录，我找不到任何与我找到的Java和python接口的接口相对应的东西。

Java的例子是here。

我贪婪地寻找在PHP源代码中可以想到的函数名的各种组合，但没有找到任何东西。我正在寻找类似的东西：

$channel->confirm_select();

...

$channel->wait();

看起来https://github.com/videlalvaro/php-amqplib/blob/master/PhpAmqpLib/Helper/Protocol/Protocol091.php支持该功能，但我不知道它是如何向用户公开的。

Answer 1

我今天一直在寻找它，发现php-amqplib已经实现了它。

看看这个demo for details。

下面是一段代码：

$connection = new AMQPStreamConnection(HOST, PORT, USER, PASS, VHOST);
$channel = $connection->channel();
$channel->set_ack_handler(
    function (AMQPMessage $message) {
        echo "Message acked with content " . $message->body . PHP_EOL;
    }
);
$channel->set_nack_handler(
    function (AMQPMessage $message) {
        echo "Message nacked with content " . $message->body . PHP_EOL;
    }
);
/*
 * bring the channel into publish confirm mode.
 * if you would call $ch->tx_select() befor or after you brought the channel into this mode
 * the next call to $ch->wait() would result in an exception as the publish confirm mode and transactions
 * are mutually exclusive
 */
$channel->confirm_select();
/*
    name: $exchange
    type: fanout
    passive: false // don't check if an exchange with the same name exists
    durable: false // the exchange won't survive server restarts
    auto_delete: true //the exchange will be deleted once the channel is closed.
*/
$channel->exchange_declare($exchange, 'fanout', false, false, true);
$i = 1;
$msg = new AMQPMessage($i, array('content_type' => 'text/plain'));
$channel->basic_publish($msg, $exchange);
/*
 * watching the amqp debug output you can see that the server will ack the message with delivery tag 1 and the
 * multiple flag probably set to false
 */
$channel->wait_for_pending_acks();

Answer 2

显然，PECL AMQP库和纯php-amqplib库都没有实现确认扩展。此时唯一真正的解决方案是实现两个队列来模拟对发布者的确认。

在这两个库中都有实现确认的计划，但我都没有看到任何进展。