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LegacyHandler.php
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LegacyHandler.php
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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\Logger\Monolog;
use LogicException;
use MediaWiki\Logger\LegacyLogger;
use Monolog\Handler\AbstractProcessingHandler;
use Monolog\Logger;
use Socket;
use UnexpectedValueException;
/**
* Monolog imitation of MediaWiki\Logger\LegacyLogger
*
* This replicates the behavior of LegacyLogger, which in turn replicates
* MediaWiki's former wfErrorLog() function.
*
* The main use case of the LegacyHandler is to enable adoption of Monolog
* features (such as alternate formatters, extra processors, and enabling multiple
* destinations/handlers at the same time), where one of the handlers (this one)
* essentiallly does what the LegacySpi would do if you hadn't enabled
* MonologSpi. In particular: writing to a file like $wgDebugLogFile,
* and sending messages to a PHP stream or udp2log server.
*
* For udp2log output, the stream specification must have the form:
* "udp://HOST:PORT[/PREFIX]"
* where:
*
* - HOST: IPv4, IPv6 or hostname
* - PORT: server port
* - PREFIX: optional (but recommended) prefix telling udp2log how to route
* the log event. The special prefix "{channel}" will use the log event's
* channel as the prefix value.
*
* When not targeting a udp2log server, this class will act as a drop-in
* replacement for \Monolog\Handler\StreamHandler.
*
* @since 1.25
* @ingroup Debug
* @copyright © 2013 Wikimedia Foundation and contributors
*/
class LegacyHandler extends AbstractProcessingHandler {
/**
* Log sink descriptor
* @var string
*/
protected $uri;
/**
* Filter log events using legacy rules
* @var bool
*/
protected $useLegacyFilter;
/**
* Log sink
* @var Socket|resource|null
*/
protected $sink;
/**
* @var string|null
*/
protected $error;
/**
* @var string
*/
protected $host;
/**
* @var int
*/
protected $port;
/**
* @var string
*/
protected $prefix;
/**
* @param string $stream Stream URI
* @param bool $useLegacyFilter Filter log events using legacy rules
* @param int $level Minimum logging level that will trigger handler
* @param bool $bubble Can handled messages bubble up the handler stack?
*/
public function __construct(
$stream,
$useLegacyFilter = false,
$level = Logger::DEBUG,
$bubble = true
) {
parent::__construct( $level, $bubble );
$this->uri = $stream;
$this->useLegacyFilter = $useLegacyFilter;
}
/**
* Open the log sink described by our stream URI.
*/
protected function openSink() {
if ( !$this->uri ) {
throw new LogicException(
'Missing stream uri, the stream can not be opened.' );
}
$this->error = null;
set_error_handler( [ $this, 'errorTrap' ] );
if ( str_starts_with( $this->uri, 'udp:' ) ) {
$parsed = parse_url( $this->uri );
if ( !isset( $parsed['host'] ) ) {
throw new UnexpectedValueException( sprintf(
'Udp transport "%s" must specify a host', $this->uri
) );
}
if ( !isset( $parsed['port'] ) ) {
throw new UnexpectedValueException( sprintf(
'Udp transport "%s" must specify a port', $this->uri
) );
}
$this->host = $parsed['host'];
$this->port = $parsed['port'];
$this->prefix = '';
if ( isset( $parsed['path'] ) ) {
$this->prefix = ltrim( $parsed['path'], '/' );
}
if ( filter_var( $this->host, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6 ) ) {
$domain = AF_INET6;
} else {
$domain = AF_INET;
}
$this->sink = socket_create( $domain, SOCK_DGRAM, SOL_UDP );
} else {
$this->sink = fopen( $this->uri, 'a' );
}
restore_error_handler();
if ( !$this->sink ) {
$this->sink = null;
throw new UnexpectedValueException( sprintf(
'The stream or file "%s" could not be opened: %s',
// @phan-suppress-next-line PhanTypeMismatchArgumentInternalProbablyReal Set by error handler
$this->uri, $this->error
) );
}
}
/**
* Custom error handler.
* @param int $code Error number
* @param string $msg Error message
*/
protected function errorTrap( $code, $msg ) {
$this->error = $msg;
}
/**
* Should we use UDP to send messages to the sink?
* @return bool
*/
protected function useUdp() {
return $this->host !== null;
}
protected function write( array $record ): void {
if ( $this->useLegacyFilter &&
!LegacyLogger::shouldEmit(
$record['channel'], $record['message'],
$record['level'], $record
) ) {
// Do not write record if we are enforcing legacy rules and they
// do not pass this message. This used to be done in isHandling(),
// but Monolog 1.12.0 made a breaking change that removed access
// to the needed channel and context information.
return;
}
if ( $this->sink === null ) {
$this->openSink();
}
$text = (string)$record['formatted'];
if ( $this->useUdp() ) {
// Clean it up for the multiplexer
if ( $this->prefix !== '' ) {
$leader = ( $this->prefix === '{channel}' ) ?
$record['channel'] : $this->prefix;
$text = preg_replace( '/^/m', "{$leader} ", $text );
// Limit to 64 KiB
if ( strlen( $text ) > 65506 ) {
$text = substr( $text, 0, 65506 );
}
if ( !str_ends_with( $text, "\n" ) ) {
$text .= "\n";
}
} elseif ( strlen( $text ) > 65507 ) {
$text = substr( $text, 0, 65507 );
}
socket_sendto(
$this->sink,
$text,
strlen( $text ),
0,
$this->host,
$this->port
);
} else {
fwrite( $this->sink, $text );
}
}
public function close(): void {
if ( $this->sink ) {
if ( $this->useUdp() ) {
socket_close( $this->sink );
} else {
fclose( $this->sink );
}
}
$this->sink = null;
}
}

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