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<?php
/**
* @defgroup StatCounter StatCounter
*
* StatCounter is used to increment arbitrary keys for profiling reasons.
* The key/values are persisted in several possible ways (see $wgStatsMethod).
*/
/**
* Aggregator for wfIncrStats() that batches updates per request.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup StatCounter
* @author Aaron Schulz
*/
/**
* Aggregator for wfIncrStats() that batches updates per request.
* This avoids spamming the collector many times for the same key.
*
* @ingroup StatCounter
*/
class StatCounter {
/** @var Array */
protected $deltas = array(); // (key => count)
protected function __construct() {}
/**
* @return StatCounter
*/
public static function singleton() {
static $instance = null;
if ( !$instance ) {
$instance = new self();
}
return $instance;
}
/**
* Increment a key by delta $count
*
* @param string $key
* @param integer $count
* @return void
*/
public function incr( $key, $count = 1 ) {
$this->deltas[$key] = isset( $this->deltas[$key] ) ? $this->deltas[$key] : 0;
$this->deltas[$key] += $count;
if ( PHP_SAPI === 'cli' ) {
$this->flush();
}
}
/**
* Flush all pending deltas to persistent storage
*
* @return void
*/
public function flush() {
global $wgStatsMethod;
$deltas = array_filter( $this->deltas ); // remove 0 valued entries
if ( $wgStatsMethod === 'udp' ) {
$this->sendDeltasUDP( $deltas );
} elseif ( $wgStatsMethod === 'cache' ) {
$this->sendDeltasMemc( $deltas );
} else {
// disabled
}
$this->deltas = array();
}
/**
* @param array $deltas
* @return void
*/
protected function sendDeltasUDP( array $deltas ) {
global $wgUDPProfilerHost, $wgUDPProfilerPort, $wgAggregateStatsID,
$wgStatsFormatString;
$id = strlen( $wgAggregateStatsID ) ? $wgAggregateStatsID : wfWikiID();
$lines = array();
foreach ( $deltas as $key => $count ) {
$lines[] = sprintf( $wgStatsFormatString, $id, $count, $key );
}
if ( count( $lines ) ) {
static $socket = null;
if ( !$socket ) {
$socket = socket_create( AF_INET, SOCK_DGRAM, SOL_UDP );
}
$packet = '';
$packets = array();
foreach ( $lines as $line ) {
if ( ( strlen( $packet ) + strlen( $line ) ) > 1450 ) {
$packets[] = $packet;
$packet = '';
}
$packet .= $line;
}
if ( $packet != '' ) {
$packets[] = $packet;
}
foreach ( $packets as $packet ) {
wfSuppressWarnings();
socket_sendto(
$socket,
$packet,
strlen( $packet ),
0,
$wgUDPProfilerHost,
$wgUDPProfilerPort
);
wfRestoreWarnings();
}
}
}
/**
* @param array $deltas
* @return void
*/
protected function sendDeltasMemc( array $deltas ) {
global $wgMemc;
foreach ( $deltas as $key => $count ) {
$ckey = wfMemcKey( 'stats', $key );
if ( $wgMemc->incr( $ckey, $count ) === null ) {
$wgMemc->add( $ckey, $count );
}
}
}
}
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