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ลองเขียน custom driver สำหรับติดต่อกับ RabbitMQ / AMQP ยังไม่สมบูรณ์แต่ก็ดีกว่าการที่ต้องมา connect ผ่าน php-amqplib ทุกครั้งที่จะใช้ตามปกติ

1. config file ก่อนตามระเบียบ

   <?php
   defined('BASEPATH') or exit('No direct script access allowed');
   
   /*
   | -------------------------------------------------------------------
   | RABBITMQ CONNECTIVITY SETTINGS
   | -------------------------------------------------------------------
   | This file will contain the settings needed to access your RabbitMQ.
   |
   | For complete instructions please consult the 'RabbitMQ Connection'
   | page of the User Guide.
   |
   | -------------------------------------------------------------------
   | EXPLANATION OF VARIABLES
   | -------------------------------------------------------------------
   |
   |    ['connection_timeout'] => 3.0,
   |    ['context'] => null,
   |    ['heartbeat'] => 0
   |    ['host'],
   |    ['insist'] => false,
   |    ['keepalive'] => false,
   |    ['locale'] => 'en_US',
   |    ['login_method'] => 'AMQPLAIN',
   |    ['login_response'] => null,
   |    ['password'],
   |    ['port'],
   |    ['read_write_timeout'] => 3.0,
   |    ['user'],
   |    ['vhost'] => '/',
    */
   $config['RabbitMQ']['connects'] = [
       'default' => [
           'connection_timeout' => 3.0,
           'context' => null,
           'heartbeat' => 0,
           'host' => '127.0.0.1',
           'insist' => false,
           'keepalive' => false,
           'locale' => 'en_US',
           'login_method' => 'AMQPLAIN',
           'login_response' => null,
           'password' => 'guest',
           'port' => 5672,
           'read_write_timeout' => 3.0,
           'user' => 'guest',
           'vhost' => '/',
       ],
   ];
   
   /*
   | -------------------------------------------------------------------
   | RABBITMQ DEBUG SETTINGS
   | -------------------------------------------------------------------
   |
    */
   $config['RabbitMQ']['debug'] = false;
   

2. ถึงคิวไฟล์ driver ที่จะเป็นตัวกลางระหว่าง codeigniter และ php-amqplib

   <?php
   use PhpAmqpLib\Connection\AMQPStreamConnection;
   use PhpAmqpLib\Message\AMQPMessage;
   
   class RabbitMQ extends AMQPStreamConnection
   {
   
       public function __construct($config = array())
       {
           $this->CI = &get_instance();
   
           $this->config = $config['RabbitMQ'];
   
           if ($this->config['debug'] == true) {
               define('AMQP_DEBUG', true);
           }
       }
   
       public function connect($dsnId = 'default') {
           $dsn = $this->config['connects'][$dsnId];
   
           $this->connection = new AMQPStreamConnection($dsn['host'], $dsn['port'], $dsn['user'], $dsn['password'], $dsn['vhost'], $dsn['insist'], $dsn['login_method'], $dsn['login_response'], $dsn['locale'], $dsn['connection_timeout'], $dsn['read_write_timeout'], $dsn['context'], $dsn['keepalive'], $dsn['heartbeat']);
   
           $this->channel = $this->connection->channel();
       }
   
       public function disconnect()
       {
           $this->channel->close();
           $this->connection->close();
       }
   
       public function setMessageJson($datas)
       {
           $msg_body = json_encode($datas);
   
           $properties = [
               'content_type' => 'application/json',
               'delivery_mode' => AMQPMessage::DELIVERY_MODE_PERSISTENT,
           ];
   
           return new AMQPMessage($msg_body, $properties);
       }
   
   }

3. ที่นี้ก็ controller ที่จะทำงานให้

   <?php
   defined('BASEPATH') or exit('No direct script access allowed');
   
   class Messaging extends CI_Controller
   {
       public function __construct()
       {
           parent::__construct();
   
           $this->load->driver('RabbitMQ');
       }
   
       public function receive()
       {
           set_time_limit(0);
   
           $this->rabbitmq->connect();
   
           $exchange_name = 'customers';
           $queue_name = 'invoices';
   
   /**
    * Declares exchange
    *
    * @param string $exchange_name
    * @param string $type
    * @param bool $passive
    * @param bool $durable
    * @param bool $auto_delete
    * @param bool $internal
    * @param bool $nowait
    * @param array $arguments
    * @param int $ticket
    * @return mixed|null
    */
           $this->rabbitmq->channel->exchange_declare($exchange_name, 'fanout', false, true, false);
   
   /**
    * Declares queue, creates if needed
    *
    * @param string $queue
    * @param bool $passive
    * @param bool $durable
    * @param bool $exclusive
    * @param bool $auto_delete
    * @param bool $nowait
    * @param array $arguments
    * @param int $ticket
    * @return mixed|null
    */
           list($queueName, $message_count, $consumer_count) = $this->rabbitmq->channel->queue_declare('', false, false, true, false);
           $this->rabbitmq->channel->queue_bind($queue_name, $exchange_name);
   
           $callback = function ($msg) {
   
               $datas = json_decode($msg->body, true);
               fwrite(fopen('RabbitMQReceive.txt', 'a+'), print_r($datas, true));
   
               sleep(substr_count($msg->body, '.'));
   
               /* delete message */
               $msg->delivery_info['channel']->basic_ack($msg->delivery_info['delivery_tag']);
           };
   
   /**
    * Starts a queue consumer
    *
    * @param string $queue_name
    * @param string $consumer_tag
    * @param bool $no_local
    * @param bool $no_ack
    * @param bool $exclusive
    * @param bool $nowait
    * @param callback|null $callback
    * @param int|null $ticket
    * @param array $arguments
    * @return mixed|string
    */
           $this->rabbitmq->channel->basic_consume($queue_name, '', false, false, false, false, $callback);
   
           while (count($this->rabbitmq->channel->callbacks)) {
   /**
    * Wait for some expected AMQP methods and dispatch to them.
    * Unexpected methods are queued up for later calls to this PHP
    * method.
    *
    * @param array $allowed_methods
    * @param bool $non_blocking
    * @param int $timeout
    * @throws \PhpAmqpLib\Exception\AMQPOutOfBoundsException
    * @throws \PhpAmqpLib\Exception\AMQPRuntimeException
    * @return mixed
    */
               $this->rabbitmq->channel->wait();
           }
   
           $this->rabbitmq->channel->close();
           $connection->close();
       }
   
       public function send()
       {
           $this->rabbitmq->connect();
   
           $exchange_name = 'customers';
           $queue_name = 'invoices';
   
   /**
    * Declares exchange
    *
    * @param string $exchange_name
    * @param string $type
    * @param bool $passive
    * @param bool $durable
    * @param bool $auto_delete
    * @param bool $internal
    * @param bool $nowait
    * @param array $arguments
    * @param int $ticket
    * @return mixed|null
    */
           $this->rabbitmq->channel->exchange_declare($exchange_name, 'fanout', false, true, false);
   
   /**
    * Declares queue, creates if needed
    *
    * @param string $queue
    * @param bool $passive
    * @param bool $durable
    * @param bool $exclusive
    * @param bool $auto_delete
    * @param bool $nowait
    * @param array $arguments
    * @param int $ticket
    * @return mixed|null
    */
           list($queueName, $message_count, $consumer_count) = $this->rabbitmq->channel->queue_declare($queue_name, false, true, false, false);
   
           $datas = [
               'rand' => rand(0, 100),
               'time' => date('Y-m-d H:m:s'),
           ];
   
   /**
    * Declares message
    *
    * @param array $datas
    * @return string
    */
           $msg = $this->rabbitmq->setMessageJson($datas);
   
   /**
    * Publishes a message
    *
    * @param AMQPMessage $msg
    * @param string $exchange
    * @param string $routing_key
    * @param bool $mandatory
    * @param bool $immediate
    * @param int $ticket
    */
           $this->rabbitmq->channel->basic_publish($msg, $exchange_name, $queue_name);
   
           echo '<br><pre>' . print_r($datas, true), '</pre>';
   
           $this->rabbitmq->disconnect();
   
       }
   
   }
   

4. ทดสอบโดยเรียก http://localhost/CodeIgniter-3.1.3/messaging/send และ http://localhost/CodeIgniter-3.1.3/messaging/receive