<?php

require_once __DIR__ . '/vendor/autoload.php';
use PhpAmqpLib\Connection\AMQPStreamConnection;
use PhpAmqpLib\Message\AMQPMessage;

//建立连接和通道
$connection = new AMQPStreamConnection('localhost', 5672, 'guest', 'guest');
$channel = $connection->channel();

//声明队列
$channel->queue_declare('rpc_queue', false, false, false, false);

function fib($n)
{
    if ($n == 0)
        return 0;
    if ($n == 1)
        return 1;
    return fib($n - 1) + fib($n - 2);
}

echo " [x] Awaiting RPC requests\n";
$callback = function ($req) {
    $n = intval($req->body);
    echo " [.] fib(", $n, ")\n";

    $msg = new AMQPMessage(
        (string)fib($n),
        array('correlation_id' => $req->get('correlation_id'))
    );

    $req->delivery_info['channel']->basic_publish(
        $msg, '', $req->get('reply_to'));
    $req->delivery_info['channel']->basic_ack(
        $req->delivery_info['delivery_tag']);
};

$channel->basic_qos(null, 1, null);
$channel->basic_consume('rpc_queue', '', false, false, false, false, $callback);

while (count($channel->callbacks)) {
    $channel->wait();
}

$channel->close();
$connection->close();

?>