I created a php standalone app for the above purpose with codeigniter. By some reason the worker app loses its connection to rabbitmq. i would like to know the best way to do this. How can a worker app on appfog can sustain the application restarts.
what of kind of thing i need to use to solve the above problem.
I figured that the problem is not with rabbitmq connection. it is with the code related to mysql inserts. i checked the crash logs of my app and the error is "Mysql gone away". an example of php rabbitmq consumer has call backs for receive message and register_shutdown. in receive call back i can not use $this of code igniter because its out of scope and i was using get_instance(). i am not sure how to call a method from rabbitmq client receive call back function
The controller is
<?php
if (!defined('BASEPATH'))
exit('No direct script access allowed');
include(__DIR__ . '/php-amqplib/config.php');
use PhpAmqpLib\Connection\AMQPConnection;
class Welcome extends CI_Controller {
public function __construct() {
parent::__construct();
}
public function index() {
//connect to rabbitmq and consume messages
//insert messages to mysql
//$this->messages = array();
$exchange = "router";
$queue = "abbiya";
$conn = new AMQPConnection(HOST, PORT, USER, PASS, VHOST);
$ch = $conn->channel();
/*
name: $queue
passive: false
durable: true // the queue will survive server restarts
exclusive: false // the queue can be accessed in other channels
auto_delete: false //the queue won't be deleted once the channel is closed.
*/
$ch->queue_declare($queue, false, true, false, false);
$ch->queue_bind($queue, $exchange, $queue);
/*
queue: Queue from where to get the messages
consumer_tag: Consumer identifier
no_local: Don't receive messages published by this consumer.
no_ack: Tells the server if the consumer will acknowledge the messages.
exclusive: Request exclusive consumer access, meaning only this consumer can access the queue
nowait:
callback: A PHP Callback
*/
$consumer_tag = "abbiya";
$ch->basic_recover(true);
$ch->basic_consume($queue, $consumer_tag, false, false, false, false, function($msg) {
$message_body = json_decode($msg->body);
$msg->delivery_info['channel']->
basic_ack($msg->delivery_info['delivery_tag']);
// Send a message with the string "quit" to cancel the consumer.
if ($msg->body === 'quit') {
$msg->delivery_info['channel']->
basic_cancel($msg->delivery_info['consumer_tag']);
}
$data = array(
'sender_id' => $message_body->r,
'receiver_id' => $message_body->s,
'message_content' => $message_body->m,
// 'sent_time' => $message_body->t,
'status' => 0
);
$ci =& get_instance();
$ci->Message_model->newMessage($data);
}
);
// Loop as long as the channel has callbacks registered
while (count($ch->callbacks)) {
$ch->wait();
}
register_shutdown_function(function() use ($ch, $conn) {
$ch->close();
$conn->close();
$this->index();
}
);
}
}
/* End of file welcome.php */
/* Location: ./application/controllers/welcome.php */
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