Memory Leak

[Jaran]

Hello there! I got a little problem with a UDP server. It crashes due to a memory leak, and I am not experienced enough to figure out why.

 

Here is the code:

<?php

ini_set( 'display_errors', true );
ini_set('memory_limit', '1000000M');

class UDP_Server {

	protected $_socket = null;
	protected $_host = '';
	protected $_port = 0;
	protected $_clients = array();
	protected $_debug = false;

	public function __construct( $host = '', $port = 0 ) {
		$this->_host = $host;
		$this->_port = $port;
		$this->_socket = $this->_create_udp_server( $host, $port );
	}

	public function set_debug( $value = false ) {
		$this->_debug = $value;
	}

	public function process() {
		$buffer = stream_socket_recvfrom( $this->_socket, 1024, 0, $remote_host );
		if( empty( $buffer ) ) {
			return;
		}

		if( $this->_debug ) {
			echo $remote_host, ': ', $buffer, "\n";
		}

		if( strpos( $buffer, 'udp.register.ip' ) !== false ) {
			if( ! in_array( $remote_host, $this->_clients ) ) {
				$this->_clients[] = $remote_host;
			}

			stream_socket_sendto( $this->_socket, 'udp.register.complete', 0, $remote_host );
			return;
		}

		foreach( $this->_clients as $client ) {
			if( $client === $remote_host ) {
				continue;
			}
			stream_socket_sendto( $this->_socket, $buffer, 0, $client );
		}
	}

	public function __destruct() {
		fclose( $this->_socket );
	}

	protected static function _create_udp_server( $host = '0.0.0.0', $port = 0 ) {
		$address = 'udp://' . $host . ':' . $port;
		$socket = stream_socket_server( $address, $error_number, $error_message, STREAM_SERVER_BIND );
		if( ! $socket ) {
			die( 'could not create UDP server for ' . $address . '; Reason: [' . $error_number . '] - ' . $error_message );
		}

		stream_set_blocking( $socket, 0 );
		return $socket;
	}

}

$at_data_server  = new UDP_Server( '0.0.0.0', 5556 );
//$nav_data_server = new UDP_Server( '0.0.0.0', 5554 );
$at_data_server->set_debug( true );

while( 1 ) {
	$at_data_server->process();
	//$nav_data_server->process();
}

And here is the error log:

C:\Users\Jaran\Desktop>d:

D:\>cd xampp

D:\xampp>cd htdocs

D:\xampp\htdocs>php udp-server.php
AT*PCMD=29259,0,0,0,0,0T*REF=29258,0
AT*PCMD=29261,0,0,0,0,0T*REF=29260,0
AT*PCMD=29263,0,0,0,0,0T*REF=29262,0
AT*PCMD=29265,0,0,0,0,0T*REF=29264,0
AT*PCMD=29267,0,0,0,0,0T*REF=29266,0
AT*PCMD=29269,0,0,0,0,0T*REF=29268,0
AT*PCMD=29271,0,0,0,0,0T*REF=29270,0
AT*PCMD=29273,0,0,0,0,0T*REF=29272,0
AT*PCMD=29275,0,0,0,0,0T*REF=29274,0
AT*PCMD=29277,0,0,0,0,0T*REF=29276,0
AT*PCMD=29279,0,0,0,0,0T*REF=29278,0
AT*PCMD=29281,0,0,0,0,0T*REF=29280,0
AT*PCMD=29283,0,0,0,0,0T*REF=29282,0
AT*PCMD=29285,0,0,0,0,0T*REF=29284,0
AT*PCMD=29287,0,0,0,0,0T*REF=29286,0
AT*PCMD=29289,0,0,0,0,0T*REF=29288,0
AT*PCMD=29291,0,0,0,0,0T*REF=29290,0
AT*PCMD=29293,0,0,0,0,0T*REF=29292,0
AT*PCMD=29295,0,0,0,0,0T*REF=29294,0
AT*PCMD=29297,0,0,0,0,0T*REF=29296,0
AT*PCMD=29299,0,0,0,0,0T*REF=29298,0
AT*PCMD=29301,0,0,0,0,0T*REF=29300,0
AT*PCMD=29303,0,0,0,0,0T*REF=29302,0
AT*PCMD=29305,0,0,0,0,0T*REF=29304,0
AT*PCMD=29307,0,0,0,0,0T*REF=29306,0
AT*PCMD=29309,0,0,0,0,0T*REF=29308,0
AT*PCMD=29311,0,0,0,0,0T*REF=29310,0
AT*PCMD=29313,0,0,0,0,0T*REF=29312,0
AT*PCMD=29315,0,0,0,0,0T*REF=29314,0
AT*PCMD=29317,0,0,0,0,0T*REF=29316,0
AT*PCMD=29319,0,0,0,0,0T*REF=29318,0
AT*PCMD=29321,0,0,0,0,0T*REF=29320,0
AT*PCMD=29323,0,0,0,0,0T*REF=29322,0
AT*PCMD=29325,0,0,0,0,0T*REF=29324,0
AT*PCMD=29327,0,0,0,0,0T*REF=29326,0
AT*PCMD=29329,0,0,0,0,0T*REF=29328,0
AT*PCMD=29331,0,0,0,0,0T*REF=29330,0
AT*PCMD=29333,0,0,0,0,0T*REF=29332,0
91.131.53.24:56100: udp.register.ip
AT*PCMD=29335,0,0,0,0,0T*REF=29334,0
AT*PCMD=29337,0,0,0,0,0T*REF=29336,0
AT*PCMD=29339,0,0,0,0,0T*REF=29338,0
AT*PCMD=29341,0,0,0,0,0T*REF=29340,0
AT*PCMD=29343,0,0,0,0,0T*REF=29342,0
AT*PCMD=29345,0,0,0,0,0T*REF=29344,0
AT*PCMD=29347,0,0,0,0,0T*REF=29346,0
AT*PCMD=29349,0,0,0,0,0T*REF=29348,0
AT*PCMD=29351,0,0,0,0,0T*REF=29350,0
AT*PCMD=29353,0,0,0,0,0T*REF=29352,0
AT*PCMD=29355,0,0,0,0,0T*REF=29354,0
AT*PCMD=29357,0,0,0,0,0T*REF=29356,0
AT*PCMD=29359,0,0,0,0,0T*REF=29358,0
AT*PCMD=29361,0,0,0,0,0T*REF=29360,0
AT*PCMD=29363,0,0,0,0,0T*REF=29362,0
AT*PCMD=29365,0,0,0,0,0T*REF=29364,0
AT*PCMD=29367,0,0,0,0,0T*REF=29366,0
AT*PCMD=29369,0,0,0,0,0T*REF=29368,0
AT*PCMD=29371,0,0,0,0,0T*REF=29370,0
AT*PCMD=29373,0,0,0,0,0T*REF=29372,0
AT*PCMD=29375,0,0,0,0,0T*REF=29374,0
AT*PCMD=29377,0,0,0,0,0T*REF=29376,0
AT*PCMD=29379,0,0,0,0,0T*REF=29378,0
AT*PCMD=29381,0,0,0,0,0T*REF=29380,0
AT*PCMD=29383,0,0,0,0,0T*REF=29382,0
AT*PCMD=29385,0,0,0,0,0T*REF=29384,0
AT*PCMD=29387,0,0,0,0,0T*REF=29386,0
AT*PCMD=29389,0,0,0,0,0T*REF=29388,0
AT*PCMD=29391,0,0,0,0,0T*REF=29390,0
AT*PCMD=29393,0,0,0,0,0T*REF=29392,0

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate
 79 bytes) in D:\xampp\htdocs\udp-server.php on line 25

D:\xampp\htdocs>pause
Trykk en tast for å fortsette...

Does anyone have any clue on how I can fix this?

[requinix]

Tip: use -1 for the memory limit if you don't want a memory limit.

 

1. Where are those AT* lines coming from?

2. Have you used something like memory_get_usage to see where the memory increase comes from?

3. Why did you disable blocking? PHP will soak up CPU until a message comes in. Leave blocking off if you must, but use stream_select to wait for a message to arrive, optionally with a timeout, and only try to recv a message once that returns activity (by looking at the modified $read parameter).

[Jaran]

Tip: use -1 for the memory limit if you don't want a memory limit.

 

1. Where are those AT* lines coming from?

2. Have you used something like memory_get_usage to see where the memory increase comes from?

3. Why did you disable blocking? PHP will soak up CPU until a message comes in. Leave blocking off if you must, but use stream_select to wait for a message to arrive, optionally with a timeout, and only try to recv a message once that returns activity (by looking at the modified $read parameter).

 

 

I did not create the code above, it is made by this guy: https://carldanley.com/controlling-the-ar-drone-over-lte/

 

It is a part of what I need to control my AR Drone through LTE/4G network.

 

If I removes the memory limit won't that cause some problems?

 

As I did not create the script I can't answear your other questions. I am pretty basic at PHP

 

EDIT: Tried to remove the memory limit, but the scripts does not run for even a minute before it is out of memory.

Edited June 29, 2015 by Jaran

[requinix]

If I removes the memory limit won't that cause some problems?

The code already tries to do that with

ini_set('memory_limit', '1000000M');

That's about a terabyte.

 

EDIT: Tried to remove the memory limit, but the scripts does not run for even a minute before it is out of memory.

It was suggestion only to modify that ugly ini_set() line. The memory problem will still be there.