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<?php
/**
* 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
*/
namespace MediaWiki\PoolCounter;
use MediaWiki\Status\Status;
/**
* @since 1.16
*/
class PoolCounterClient extends PoolCounter {
/**
* @var ?resource the socket connection to the poolcounterd. Closing this
* releases all locks acquired.
*/
private $conn;
/**
* @var string The server host name
*/
private $hostName;
/**
* @var PoolCounterConnectionManager
*/
private $manager;
public function setManager( PoolCounterConnectionManager $manager ): void {
$this->manager = $manager;
}
/**
* @return Status
*/
public function getConn() {
if ( !$this->conn ) {
$status = $this->manager->get( $this->key );
if ( !$status->isOK() ) {
return $status;
}
// @phan-suppress-next-line PhanTypeArraySuspiciousNullable
$this->conn = $status->value['conn'];
// @phan-suppress-next-line PhanTypeArraySuspiciousNullable
$this->hostName = $status->value['hostName'];
// Set the read timeout to be 1.5 times the pool timeout.
// This allows the server to time out gracefully before we give up on it.
stream_set_timeout( $this->conn, 0, (int)( $this->timeout * 1e6 * 1.5 ) );
}
// TODO: Convert from Status to StatusValue
return Status::newGood( $this->conn );
}
/**
* @param string|int|float ...$args
* @return Status
*/
public function sendCommand( ...$args ) {
$args = str_replace( ' ', '%20', $args );
$cmd = implode( ' ', $args );
$status = $this->getConn();
if ( !$status->isOK() ) {
return $status;
}
$conn = $status->value;
$this->logger->debug( "Sending pool counter command: $cmd" );
if ( fwrite( $conn, "$cmd\n" ) === false ) {
return Status::newFatal( 'poolcounter-write-error', $this->hostName );
}
$response = fgets( $conn );
if ( $response === false ) {
return Status::newFatal( 'poolcounter-read-error', $this->hostName );
}
$response = rtrim( $response, "\r\n" );
$this->logger->debug( "Got pool counter response: $response" );
$parts = explode( ' ', $response, 2 );
$responseType = $parts[0];
switch ( $responseType ) {
case 'LOCKED':
$this->onAcquire();
break;
case 'RELEASED':
$this->onRelease();
break;
case 'DONE':
case 'NOT_LOCKED':
case 'QUEUE_FULL':
case 'TIMEOUT':
case 'LOCK_HELD':
break;
case 'ERROR':
default:
$parts = explode( ' ', $parts[1], 2 );
$errorMsg = $parts[1] ?? '(no message given)';
return Status::newFatal( 'poolcounter-remote-error', $errorMsg, $this->hostName );
}
return Status::newGood( constant( "PoolCounter::$responseType" ) );
}
/**
* @param int|null $timeout
* @return Status
*/
public function acquireForMe( $timeout = null ) {
$status = $this->precheckAcquire();
if ( !$status->isGood() ) {
return $status;
}
return $this->sendCommand( 'ACQ4ME', $this->key, $this->workers, $this->maxqueue,
$timeout ?? $this->timeout );
}
/**
* @param int|null $timeout
* @return Status
*/
public function acquireForAnyone( $timeout = null ) {
$status = $this->precheckAcquire();
if ( !$status->isGood() ) {
return $status;
}
return $this->sendCommand( 'ACQ4ANY', $this->key, $this->workers, $this->maxqueue,
$timeout ?? $this->timeout );
}
/**
* @return Status
*/
public function release() {
$status = $this->sendCommand( 'RELEASE' );
if ( $this->conn ) {
$this->manager->close( $this->conn );
$this->conn = null;
}
return $status;
}
}