Multiple types of messaging queues in php with php-amqplib and rabbitmq

Question

So, I'm trying to create a simple app that would do 4 things.

1) get a list of consumers ( if I can get those that registered .. maybe I can name them somehow when they join so it's dynamic ).

2) send a "message" to one random consumer and display the result

3) send a "message" to one specific consumer ( got from the list above or maybe a predefined list ) and display the result

4) send a "message" to all consumers and display the results as they come from each one.

The app is done in php with php-amqplib (https://github.com/videlalvaro/php-amqplib) . The rabbitmq is up and running and seems to work ( tried the tutorials ).

The documentation for the amqp lib for me is a bit weird so what I'd greatly appreciate would some lines of example code and description of the params used.

Answer 1

1) can be solved by using rabbitmq's management /api/queues by naming each consumer with a persistent queue name for itself.

2,3,4, got solved like this:

<?php
//Producer Config
$host = "remote_host";
$port = 5672;
$user = "user";
$pass = "pass";
$array = array("consumer1", "consumer2");

...

<?php
//Producer

if(!isset($argv[1]) || !isset($argv[2])){
        die("Specify a target and a message\n");
}

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

$corr_id = uniqid();

$connection = new AMQPSSLConnection($host, $port, $user, $pass, "/", array("verify_peer" => false));
$channel = $connection->channel();

$response = null;
$onResponse = function ($rep) {
        global $response;
        $response = $rep->body;
        echo " [>] Received: '".$response."'\n";
};

list($callback_queue, ,) = $channel->queue_declare("", false, false, true, false);
$channel->basic_consume($callback_queue, '', false, false, false, false, $onResponse);
$msg = new AMQPMessage($argv[2], array('correlation_id' => uniqid(), 'reply_to' => $callback_queue));

switch($argv[1]){
        case "random":
                $dest = $array[array_rand($array)];
                $type = "direct";
                break;
        case "all":
                $dest = "to_all";
                $type = "fanout";
                break;
        case $argv[1]:
                $dest = $argv[1];
                $type = "direct";
                break;
}

$channel->exchange_declare($dest, $type, false, false, false);
$channel->basic_publish($msg, $dest);
echo " [<] Sent '".$argv[2]."' to '".$dest."'\n";

try {
        if($dest == "to_all"){
                $replies = 0;
                while(!$response || $replies < count($consumers_array)){
                        $channel->wait(null, false, $timeout);
                        $replies++;
                }
        }else{
                while(!$response){
                        $channel->wait(null, false, $timeout);
                }
        }
}catch(PhpAmqpLib\Exception\AMQPTimeoutException $e){
        echo " [x] AMQPTimeoutException thrown\n";
}

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

...

<?php
//Consumer config
$host = "remote_host";
$port = 5672;
$user = "user";
$pass = "pass";
$consumer_name = "consumerX";

...

<?php
//Consumer
require_once __DIR__ . '/config.php';
require_once __DIR__ . '/vendor/autoload.php';
use PhpAmqpLib\Connection\AMQPSSLConnection;
use PhpAmqpLib\Message\AMQPMessage;

$connection = new AMQPSSLConnection($host, $port, $user, $pass, "/", array('verify_peer' => false));
$channel = $connection->channel();

$channel->exchange_declare('to_all', 'fanout', false, false, false);
$channel->exchange_declare($consumer_name, 'direct', false, false, false);
$channel->queue_declare($consumer_name, false, false, true, false);
$channel->queue_bind($consumer_name, 'to_all');
$channel->queue_bind($consumer_name, $consumer_name);
echo '[*] Waiting for messages. To exit press CTRL+C', "\n";

$callback = function($msg) {
        echo " [>] Received: '".$msg->body."'\n";
        $rand = rand(1,3);
        sleep($rand);
        $reply = uniqid()." - slept ".$rand;
        echo " [<] Replied: '".$reply."'\n";
        $raspuns = new AMQPMessage($reply);
        $msg->delivery_info['channel']->basic_publish($raspuns,'',$msg->get('reply_to'));
};

$channel->basic_consume($consumer_name, '', false, true, false, false, $callback);

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

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

Not sure this is the best way but it got my "hello world" going.