includes/debug/logger/LegacyLogger.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  */
  20
  21 namespace MediaWiki\Logger;
  22
  23 use DateTimeZone;
  24 use Exception;
  25 use MWDebug;
  26 use MWExceptionHandler;
  27 use Psr\Log\AbstractLogger;
  28 use Psr\Log\LogLevel;
  29 use UDPTransport;
  30
  31 /**
  32  * PSR-3 logger that mimics the historic implementation of MediaWiki's
  33  * wfErrorLog logging implementation.
  34  *
  35  * This logger is configured by the following global configuration variables:
  36  * - `$wgDebugLogFile`
  37  * - `$wgDebugLogGroups`
  38  * - `$wgDBerrorLog`
  39  * - `$wgDBerrorLogTZ`
  40  *
  41  * See documentation in DefaultSettings.php for detailed explanations of each
  42  * variable.
  43  *
  44  * @see \MediaWiki\Logger\LoggerFactory
  45  * @since 1.25
  46  * @author Bryan Davis <bd808@wikimedia.org>
  47  * @copyright © 2014 Bryan Davis and Wikimedia Foundation.
  48  */
  49 class LegacyLogger extends AbstractLogger {
  50
  51         /**
  52          * @var string $channel
  53          */
  54         protected $channel;
  55
  56         /**
  57          * Convert \Psr\Log\LogLevel constants into int for sane comparisons
  58          * These are the same values that Monlog uses
  59          *
  60          * @var array $levelMapping
  61          */
  62         protected static $levelMapping = [
  63                 LogLevel::DEBUG => 100,
  64                 LogLevel::INFO => 200,
  65                 LogLevel::NOTICE => 250,
  66                 LogLevel::WARNING => 300,
  67                 LogLevel::ERROR => 400,
  68                 LogLevel::CRITICAL => 500,
  69                 LogLevel::ALERT => 550,
  70                 LogLevel::EMERGENCY => 600,
  71         ];
  72
  73         /**
  74          * @var array
  75          */
  76         protected static $dbChannels = [
  77                 'DBQuery' => true,
  78                 'DBConnection' => true
  79         ];
  80
  81         /**
  82          * @param string $channel
  83          */
  84         public function __construct( $channel ) {
  85                 $this->channel = $channel;
  86         }
  87
  88         /**
  89          * Logs with an arbitrary level.
  90          *
  91          * @param string|int $level
  92          * @param string $message
  93          * @param array $context
  94          * @return null
  95          */
  96         public function log( $level, $message, array $context = [] ) {
  97                 if ( isset( self::$dbChannels[$this->channel] )
  98                         && isset( self::$levelMapping[$level] )
  99                         && self::$levelMapping[$level] >= LogLevel::ERROR
 100                 ) {
 101                         // Format and write DB errors to the legacy locations
 102                         $effectiveChannel = 'wfLogDBError';
 103                 } else {
 104                         $effectiveChannel = $this->channel;
 105                 }
 106
 107                 if ( self::shouldEmit( $effectiveChannel, $message, $level, $context ) ) {
 108                         $text = self::format( $effectiveChannel, $message, $context );
 109                         $destination = self::destination( $effectiveChannel, $message, $context );
 110                         self::emit( $text, $destination );
 111                 }
 112                 if ( $this->channel === 'DBQuery' && isset( $context['method'] )
 113                         && isset( $context['master'] ) && isset( $context['runtime'] )
 114                 ) {
 115                         MWDebug::query( $message, $context['method'], $context['master'], $context['runtime'] );
 116                 } elseif ( !isset( $context['private'] ) || !$context['private'] ) {
 117                         // Add to debug toolbar if not marked as "private"
 118                         MWDebug::debugMsg( $message, [ 'channel' => $this->channel ] + $context );
 119                 }
 120         }
 121
 122         /**
 123          * Determine if the given message should be emitted or not.
 124          *
 125          * @param string $channel
 126          * @param string $message
 127          * @param string|int $level \Psr\Log\LogEvent constant or Monlog level int
 128          * @param array $context
 129          * @return bool True if message should be sent to disk/network, false
 130          * otherwise
 131          */
 132         public static function shouldEmit( $channel, $message, $level, $context ) {
 133                 global $wgDebugLogFile, $wgDBerrorLog, $wgDebugLogGroups;
 134
 135                 if ( $channel === 'wfLogDBError' ) {
 136                         // wfLogDBError messages are emitted if a database log location is
 137                         // specfied.
 138                         $shouldEmit = (bool)$wgDBerrorLog;
 139
 140                 } elseif ( $channel === 'wfErrorLog' ) {
 141                         // All messages on the wfErrorLog channel should be emitted.
 142                         $shouldEmit = true;
 143
 144                 } elseif ( $channel === 'wfDebug' ) {
 145                         // wfDebug messages are emitted if a catch all logging file has
 146                         // been specified. Checked explicitly so that 'private' flagged
 147                         // messages are not discarded by unset $wgDebugLogGroups channel
 148                         // handling below.
 149                         $shouldEmit = $wgDebugLogFile != '';
 150
 151                 } elseif ( isset( $wgDebugLogGroups[$channel] ) ) {
 152                         $logConfig = $wgDebugLogGroups[$channel];
 153
 154                         if ( is_array( $logConfig ) ) {
 155                                 $shouldEmit = true;
 156                                 if ( isset( $logConfig['sample'] ) ) {
 157                                         // Emit randomly with a 1 in 'sample' chance for each message.
 158                                         $shouldEmit = mt_rand( 1, $logConfig['sample'] ) === 1;
 159                                 }
 160
 161                                 if ( isset( $logConfig['level'] ) ) {
 162                                         if ( is_string( $level ) ) {
 163                                                 $level = self::$levelMapping[$level];
 164                                         }
 165                                         $shouldEmit = $level >= self::$levelMapping[$logConfig['level']];
 166                                 }
 167                         } else {
 168                                 // Emit unless the config value is explictly false.
 169                                 $shouldEmit = $logConfig !== false;
 170                         }
 171
 172                 } elseif ( isset( $context['private'] ) && $context['private'] ) {
 173                         // Don't emit if the message didn't match previous checks based on
 174                         // the channel and the event is marked as private. This check
 175                         // discards messages sent via wfDebugLog() with dest == 'private'
 176                         // and no explicit wgDebugLogGroups configuration.
 177                         $shouldEmit = false;
 178                 } else {
 179                         // Default return value is the same as the historic wfDebug
 180                         // method: emit if $wgDebugLogFile has been set.
 181                         $shouldEmit = $wgDebugLogFile != '';
 182                 }
 183
 184                 return $shouldEmit;
 185         }
 186
 187         /**
 188          * Format a message.
 189          *
 190          * Messages to the 'wfDebug', 'wfLogDBError' and 'wfErrorLog' channels
 191          * receive special fomatting to mimic the historic output of the functions
 192          * of the same name. All other channel values are formatted based on the
 193          * historic output of the `wfDebugLog()` global function.
 194          *
 195          * @param string $channel
 196          * @param string $message
 197          * @param array $context
 198          * @return string
 199          */
 200         public static function format( $channel, $message, $context ) {
 201                 global $wgDebugLogGroups, $wgLogExceptionBacktrace;
 202
 203                 if ( $channel === 'wfDebug' ) {
 204                         $text = self::formatAsWfDebug( $channel, $message, $context );
 205
 206                 } elseif ( $channel === 'wfLogDBError' ) {
 207                         $text = self::formatAsWfLogDBError( $channel, $message, $context );
 208
 209                 } elseif ( $channel === 'wfErrorLog' ) {
 210                         $text = "{$message}\n";
 211
 212                 } elseif ( $channel === 'profileoutput' ) {
 213                         // Legacy wfLogProfilingData formatitng
 214                         $forward = '';
 215                         if ( isset( $context['forwarded_for'] ) ) {
 216                                 $forward = " forwarded for {$context['forwarded_for']}";
 217                         }
 218                         if ( isset( $context['client_ip'] ) ) {
 219                                 $forward .= " client IP {$context['client_ip']}";
 220                         }
 221                         if ( isset( $context['from'] ) ) {
 222                                 $forward .= " from {$context['from']}";
 223                         }
 224                         if ( $forward ) {
 225                                 $forward = "\t(proxied via {$context['proxy']}{$forward})";
 226                         }
 227                         if ( $context['anon'] ) {
 228                                 $forward .= ' anon';
 229                         }
 230                         if ( !isset( $context['url'] ) ) {
 231                                 $context['url'] = 'n/a';
 232                         }
 233
 234                         $log = sprintf( "%s\t%04.3f\t%s%s\n",
 235                                 gmdate( 'YmdHis' ), $context['elapsed'], $context['url'], $forward );
 236
 237                         $text = self::formatAsWfDebugLog(
 238                                 $channel, $log . $context['output'], $context );
 239
 240                 } elseif ( !isset( $wgDebugLogGroups[$channel] ) ) {
 241                         $text = self::formatAsWfDebug(
 242                                 $channel, "[{$channel}] {$message}", $context );
 243
 244                 } else {
 245                         // Default formatting is wfDebugLog's historic style
 246                         $text = self::formatAsWfDebugLog( $channel, $message, $context );
 247                 }
 248
 249                 // Append stacktrace of exception if available
 250                 if ( $wgLogExceptionBacktrace && isset( $context['exception'] ) ) {
 251                         $e = $context['exception'];
 252                         $backtrace = false;
 253
 254                         if ( $e instanceof Exception ) {
 255                                 $backtrace = MWExceptionHandler::getRedactedTrace( $e );
 256
 257                         } elseif ( is_array( $e ) && isset( $e['trace'] ) ) {
 258                                 // Exception has already been unpacked as structured data
 259                                 $backtrace = $e['trace'];
 260                         }
 261
 262                         if ( $backtrace ) {
 263                                 $text .= MWExceptionHandler::prettyPrintTrace( $backtrace ) .
 264                                         "\n";
 265                         }
 266                 }
 267
 268                 return self::interpolate( $text, $context );
 269         }
 270
 271         /**
 272          * Format a message as `wfDebug()` would have formatted it.
 273          *
 274          * @param string $channel
 275          * @param string $message
 276          * @param array $context
 277          * @return string
 278          */
 279         protected static function formatAsWfDebug( $channel, $message, $context ) {
 280                 $text = preg_replace( '![\x00-\x08\x0b\x0c\x0e-\x1f]!', ' ', $message );
 281                 if ( isset( $context['seconds_elapsed'] ) ) {
 282                         // Prepend elapsed request time and real memory usage with two
 283                         // trailing spaces.
 284                         $text = "{$context['seconds_elapsed']} {$context['memory_used']}  {$text}";
 285                 }
 286                 if ( isset( $context['prefix'] ) ) {
 287                         $text = "{$context['prefix']}{$text}";
 288                 }
 289                 return "{$text}\n";
 290         }
 291
 292         /**
 293          * Format a message as `wfLogDBError()` would have formatted it.
 294          *
 295          * @param string $channel
 296          * @param string $message
 297          * @param array $context
 298          * @return string
 299          */
 300         protected static function formatAsWfLogDBError( $channel, $message, $context ) {
 301                 global $wgDBerrorLogTZ;
 302                 static $cachedTimezone = null;
 303
 304                 if ( !$cachedTimezone ) {
 305                         $cachedTimezone = new DateTimeZone( $wgDBerrorLogTZ );
 306                 }
 307
 308                 $d = date_create( 'now', $cachedTimezone );
 309                 $date = $d->format( 'D M j G:i:s T Y' );
 310
 311                 $host = wfHostname();
 312                 $wiki = wfWikiID();
 313
 314                 $text = "{$date}\t{$host}\t{$wiki}\t{$message}\n";
 315                 return $text;
 316         }
 317
 318         /**
 319          * Format a message as `wfDebugLog() would have formatted it.
 320          *
 321          * @param string $channel
 322          * @param string $message
 323          * @param array $context
 324          * @return null
 325          */
 326         protected static function formatAsWfDebugLog( $channel, $message, $context ) {
 327                 $time = wfTimestamp( TS_DB );
 328                 $wiki = wfWikiID();
 329                 $host = wfHostname();
 330                 $text = "{$time} {$host} {$wiki}: {$message}\n";
 331                 return $text;
 332         }
 333
 334         /**
 335          * Interpolate placeholders in logging message.
 336          *
 337          * @param string $message
 338          * @param array $context
 339          * @return string Interpolated message
 340          */
 341         public static function interpolate( $message, array $context ) {
 342                 if ( strpos( $message, '{' ) !== false ) {
 343                         $replace = [];
 344                         foreach ( $context as $key => $val ) {
 345                                 $replace['{' . $key . '}'] = self::flatten( $val );
 346                         }
 347                         $message = strtr( $message, $replace );
 348                 }
 349                 return $message;
 350         }
 351
 352         /**
 353          * Convert a logging context element to a string suitable for
 354          * interpolation.
 355          *
 356          * @param mixed $item
 357          * @return string
 358          */
 359         protected static function flatten( $item ) {
 360                 if ( null === $item ) {
 361                         return '[Null]';
 362                 }
 363
 364                 if ( is_bool( $item ) ) {
 365                         return $item ? 'true' : 'false';
 366                 }
 367
 368                 if ( is_float( $item ) ) {
 369                         if ( is_infinite( $item ) ) {
 370                                 return ( $item > 0 ? '' : '-' ) . 'INF';
 371                         }
 372                         if ( is_nan( $item ) ) {
 373                                 return 'NaN';
 374                         }
 375                         return $item;
 376                 }
 377
 378                 if ( is_scalar( $item ) ) {
 379                         return (string)$item;
 380                 }
 381
 382                 if ( is_array( $item ) ) {
 383                         return '[Array(' . count( $item ) . ')]';
 384                 }
 385
 386                 if ( $item instanceof \DateTime ) {
 387                         return $item->format( 'c' );
 388                 }
 389
 390                 if ( $item instanceof Exception ) {
 391                         return '[Exception ' . get_class( $item ) . '( ' .
 392                                 $item->getFile() . ':' . $item->getLine() . ') ' .
 393                                 $item->getMessage() . ']';
 394                 }
 395
 396                 if ( is_object( $item ) ) {
 397                         if ( method_exists( $item, '__toString' ) ) {
 398                                 return (string)$item;
 399                         }
 400
 401                         return '[Object ' . get_class( $item ) . ']';
 402                 }
 403
 404                 if ( is_resource( $item ) ) {
 405                         return '[Resource ' . get_resource_type( $item ) . ']';
 406                 }
 407
 408                 return '[Unknown ' . gettype( $item ) . ']';
 409         }
 410
 411         /**
 412          * Select the appropriate log output destination for the given log event.
 413          *
 414          * If the event context contains 'destination'
 415          *
 416          * @param string $channel
 417          * @param string $message
 418          * @param array $context
 419          * @return string
 420          */
 421         protected static function destination( $channel, $message, $context ) {
 422                 global $wgDebugLogFile, $wgDBerrorLog, $wgDebugLogGroups;
 423
 424                 // Default destination is the debug log file as historically used by
 425                 // the wfDebug function.
 426                 $destination = $wgDebugLogFile;
 427
 428                 if ( isset( $context['destination'] ) ) {
 429                         // Use destination explicitly provided in context
 430                         $destination = $context['destination'];
 431
 432                 } elseif ( $channel === 'wfDebug' ) {
 433                         $destination = $wgDebugLogFile;
 434
 435                 } elseif ( $channel === 'wfLogDBError' ) {
 436                         $destination = $wgDBerrorLog;
 437
 438                 } elseif ( isset( $wgDebugLogGroups[$channel] ) ) {
 439                         $logConfig = $wgDebugLogGroups[$channel];
 440
 441                         if ( is_array( $logConfig ) ) {
 442                                 $destination = $logConfig['destination'];
 443                         } else {
 444                                 $destination = strval( $logConfig );
 445                         }
 446                 }
 447
 448                 return $destination;
 449         }
 450
 451         /**
 452         * Log to a file without getting "file size exceeded" signals.
 453         *
 454         * Can also log to UDP with the syntax udp://host:port/prefix. This will send
 455         * lines to the specified port, prefixed by the specified prefix and a space.
 456         *
 457         * @param string $text
 458         * @param string $file Filename
 459         */
 460         public static function emit( $text, $file ) {
 461                 if ( substr( $file, 0, 4 ) == 'udp:' ) {
 462                         $transport = UDPTransport::newFromString( $file );
 463                         $transport->emit( $text );
 464                 } else {
 465                         \MediaWiki\suppressWarnings();
 466                         $exists = file_exists( $file );
 467                         $size = $exists ? filesize( $file ) : false;
 468                         if ( !$exists ||
 469                                 ( $size !== false && $size + strlen( $text ) < 0x7fffffff )
 470                         ) {
 471                                 file_put_contents( $file, $text, FILE_APPEND );
 472                         }
 473                         \MediaWiki\restoreWarnings();
 474                 }
 475         }
 476
 477 }