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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | * @file |
| 5 | */ |
| 6 | |
| 7 | namespace MediaWiki\Logger; |
| 8 | |
| 9 | use DateTimeZone; |
| 10 | use Error; |
| 11 | use LogicException; |
| 12 | use MediaWiki\Debug\MWDebug; |
| 13 | use MediaWiki\Exception\MWExceptionHandler; |
| 14 | use MediaWiki\WikiMap\WikiMap; |
| 15 | use Monolog\LogRecord; |
| 16 | use Psr\Log\AbstractLogger; |
| 17 | use Psr\Log\LogLevel; |
| 18 | use Throwable; |
| 19 | use Wikimedia\Timestamp\ConvertibleTimestamp; |
| 20 | use Wikimedia\Timestamp\TimestampFormat as TS; |
| 21 | use Wikimedia\UDPTransport; |
| 22 | |
| 23 | /** |
| 24 | * PSR-3 logger that mimics the historic implementation of MediaWiki's former |
| 25 | * wfErrorLog logging implementation. |
| 26 | * |
| 27 | * This logger is configured by the following global configuration variables: |
| 28 | * - `$wgDebugLogFile` |
| 29 | * - `$wgDebugLogGroups` |
| 30 | * - `$wgDBerrorLog` |
| 31 | * - `$wgDBerrorLogTZ` |
| 32 | * |
| 33 | * See docs/Configuration.md for detailed explanations of these settings. |
| 34 | * |
| 35 | * @see \MediaWiki\Logger\LoggerFactory |
| 36 | * @since 1.25 |
| 37 | * @ingroup Debug |
| 38 | * @copyright © 2014 Wikimedia Foundation and contributors |
| 39 | */ |
| 40 | class LegacyLogger extends AbstractLogger { |
| 41 | |
| 42 | /** |
| 43 | * @var string |
| 44 | */ |
| 45 | protected $channel; |
| 46 | |
| 47 | private const LEVEL_DEBUG = 100; |
| 48 | private const LEVEL_INFO = 200; |
| 49 | private const LEVEL_NOTICE = 250; |
| 50 | private const LEVEL_WARNING = 300; |
| 51 | private const LEVEL_ERROR = 400; |
| 52 | private const LEVEL_CRITICAL = 500; |
| 53 | private const LEVEL_ALERT = 550; |
| 54 | private const LEVEL_EMERGENCY = 600; |
| 55 | private const LEVEL_INFINITY = 999; |
| 56 | |
| 57 | /** |
| 58 | * Convert \Psr\Log\LogLevel constants into int for sensible comparisons |
| 59 | * These are the same values that Monolog uses |
| 60 | * |
| 61 | * @var array |
| 62 | */ |
| 63 | protected static $levelMapping = [ |
| 64 | LogLevel::DEBUG => self::LEVEL_DEBUG, |
| 65 | LogLevel::INFO => self::LEVEL_INFO, |
| 66 | LogLevel::NOTICE => self::LEVEL_NOTICE, |
| 67 | LogLevel::WARNING => self::LEVEL_WARNING, |
| 68 | LogLevel::ERROR => self::LEVEL_ERROR, |
| 69 | LogLevel::CRITICAL => self::LEVEL_CRITICAL, |
| 70 | LogLevel::ALERT => self::LEVEL_ALERT, |
| 71 | LogLevel::EMERGENCY => self::LEVEL_EMERGENCY, |
| 72 | ]; |
| 73 | |
| 74 | /** |
| 75 | * Minimum level. This is just to allow faster discard of debugging |
| 76 | * messages. Not all messages meeting the level will be logged. |
| 77 | * |
| 78 | * @var int |
| 79 | */ |
| 80 | private $minimumLevel; |
| 81 | |
| 82 | /** |
| 83 | * Whether the channel is a DB channel |
| 84 | * |
| 85 | * @var bool |
| 86 | */ |
| 87 | private $isDB; |
| 88 | |
| 89 | /** |
| 90 | * @param string $channel |
| 91 | */ |
| 92 | public function __construct( $channel ) { |
| 93 | global $wgDebugLogFile, $wgDBerrorLog, $wgDebugLogGroups, $wgDebugToolbar, $wgDebugRawPage, $wgShowDebug; |
| 94 | |
| 95 | $this->channel = $channel; |
| 96 | $this->isDB = ( $channel === 'rdbms' ); |
| 97 | |
| 98 | // Calculate minimum level, duplicating some of the logic from log() and shouldEmit() |
| 99 | if ( !$wgDebugRawPage && wfIsDebugRawPage() ) { |
| 100 | $this->minimumLevel = self::LEVEL_WARNING; |
| 101 | } elseif ( $wgDebugLogFile != '' || $wgShowDebug || $wgDebugToolbar ) { |
| 102 | // Log all messages if there is a debug log file or debug toolbar |
| 103 | $this->minimumLevel = self::LEVEL_DEBUG; |
| 104 | } elseif ( isset( $wgDebugLogGroups[$channel] ) ) { |
| 105 | $logConfig = $wgDebugLogGroups[$channel]; |
| 106 | // Log messages if the config is set, according to the configured level |
| 107 | if ( is_array( $logConfig ) && isset( $logConfig['level'] ) ) { |
| 108 | $this->minimumLevel = self::$levelMapping[$logConfig['level']]; |
| 109 | } else { |
| 110 | $this->minimumLevel = self::LEVEL_DEBUG; |
| 111 | } |
| 112 | } else { |
| 113 | // No other case hit: discard all messages |
| 114 | $this->minimumLevel = self::LEVEL_INFINITY; |
| 115 | } |
| 116 | |
| 117 | if ( $this->isDB && $wgDBerrorLog && $this->minimumLevel > self::LEVEL_ERROR ) { |
| 118 | // Log DB errors if there is a DB error log |
| 119 | $this->minimumLevel = self::LEVEL_ERROR; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * Change an existing Logger singleton to act like NullLogger. |
| 125 | * |
| 126 | * @internal For use by MediaWikiIntegrationTestCase::setNullLogger |
| 127 | * @param null|int $level |
| 128 | * @return int |
| 129 | */ |
| 130 | public function setMinimumForTest( ?int $level ) { |
| 131 | if ( !defined( 'MW_PHPUNIT_TEST' ) ) { |
| 132 | throw new LogicException( 'Not allowed outside tests' ); |
| 133 | } |
| 134 | // Set LEVEL_INFINITY if given null, or restore the original level. |
| 135 | $original = $this->minimumLevel; |
| 136 | $this->minimumLevel = $level ?? self::LEVEL_INFINITY; |
| 137 | return $original; |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Logs with an arbitrary level. |
| 142 | * |
| 143 | * @param string|int $level |
| 144 | * @param string $message |
| 145 | * @param array $context |
| 146 | */ |
| 147 | public function log( $level, $message, array $context = [] ): void { |
| 148 | if ( is_string( $level ) ) { |
| 149 | $level = self::$levelMapping[$level]; |
| 150 | } |
| 151 | if ( $level < $this->minimumLevel ) { |
| 152 | return; |
| 153 | } |
| 154 | |
| 155 | $context += LoggerFactory::getContext()->get(); |
| 156 | |
| 157 | if ( $this->isDB |
| 158 | && $level === self::LEVEL_DEBUG |
| 159 | && isset( $context['sql'] ) |
| 160 | ) { |
| 161 | // Also give the query information to the MWDebug tools |
| 162 | MWDebug::query( |
| 163 | $context['sql'], |
| 164 | $context['method'], |
| 165 | $context['runtime_ms'] / 1000, |
| 166 | $context['db_server'], |
| 167 | $context['rows'], |
| 168 | ); |
| 169 | } |
| 170 | |
| 171 | // If this is a DB-related error, and the site has $wgDBerrorLog |
| 172 | // configured, rewrite the channel as wfLogDBError instead. |
| 173 | // Likewise, if the site does not use $wgDBerrorLog, it should |
| 174 | // configurable like any other channel via $wgDebugLogGroups |
| 175 | // or $wgMWLoggerDefaultSpi. |
| 176 | global $wgDBerrorLog; |
| 177 | if ( $this->isDB && $level >= self::LEVEL_ERROR && $wgDBerrorLog ) { |
| 178 | // Format and write DB errors to the legacy locations |
| 179 | $effectiveChannel = 'wfLogDBError'; |
| 180 | } else { |
| 181 | $effectiveChannel = $this->channel; |
| 182 | } |
| 183 | |
| 184 | if ( self::shouldEmit( $effectiveChannel, $message, $level, $context ) ) { |
| 185 | $text = self::format( $effectiveChannel, $message, $context ); |
| 186 | $destination = self::destination( $effectiveChannel, $message, $context ); |
| 187 | $this->maybeLogToStderr( $text ); |
| 188 | self::emit( $text, $destination ); |
| 189 | } |
| 190 | if ( !isset( $context['private'] ) || !$context['private'] ) { |
| 191 | // Add to debug toolbar if not marked as "private" |
| 192 | MWDebug::debugMsg( $message, [ 'channel' => $this->channel ] + $context ); |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * Determine if the given message should be emitted or not. |
| 198 | * |
| 199 | * @param string $channel |
| 200 | * @param string $message |
| 201 | * @param string|int $level \Psr\Log\LogEvent constant or Monolog level int |
| 202 | * @param array|LogRecord $context |
| 203 | * @return bool True if message should be sent to disk/network, false |
| 204 | * otherwise |
| 205 | */ |
| 206 | public static function shouldEmit( $channel, $message, $level, $context ) { |
| 207 | global $wgDebugLogFile, $wgDBerrorLog, $wgDebugLogGroups; |
| 208 | |
| 209 | if ( is_string( $level ) ) { |
| 210 | $level = self::$levelMapping[$level]; |
| 211 | } |
| 212 | |
| 213 | if ( $channel === 'wfLogDBError' ) { |
| 214 | // wfLogDBError messages are emitted if a database log location is |
| 215 | // specified. |
| 216 | $shouldEmit = (bool)$wgDBerrorLog; |
| 217 | |
| 218 | } elseif ( $channel === 'wfDebug' ) { |
| 219 | // wfDebug messages are emitted if a catch all logging file has |
| 220 | // been specified. Checked explicitly so that 'private' flagged |
| 221 | // messages are not discarded by unset $wgDebugLogGroups channel |
| 222 | // handling below. |
| 223 | $shouldEmit = $wgDebugLogFile != ''; |
| 224 | |
| 225 | } elseif ( isset( $wgDebugLogGroups[$channel] ) ) { |
| 226 | $logConfig = $wgDebugLogGroups[$channel]; |
| 227 | |
| 228 | if ( is_array( $logConfig ) ) { |
| 229 | $shouldEmit = true; |
| 230 | if ( isset( $logConfig['sample'] ) ) { |
| 231 | // Emit randomly with a 1 in 'sample' chance for each message. |
| 232 | $shouldEmit = mt_rand( 1, $logConfig['sample'] ) === 1; |
| 233 | } |
| 234 | |
| 235 | if ( isset( $logConfig['level'] ) ) { |
| 236 | $shouldEmit = $level >= self::$levelMapping[$logConfig['level']]; |
| 237 | } |
| 238 | } else { |
| 239 | // Emit unless the config value is explicitly false. |
| 240 | $shouldEmit = $logConfig !== false; |
| 241 | } |
| 242 | |
| 243 | } elseif ( isset( $context['private'] ) && $context['private'] ) { |
| 244 | // Don't emit if the message didn't match previous checks based on |
| 245 | // the channel and the event is marked as private. This check |
| 246 | // discards messages sent via wfDebugLog() with dest == 'private' |
| 247 | // and no explicit wgDebugLogGroups configuration. |
| 248 | $shouldEmit = false; |
| 249 | } else { |
| 250 | // Default return value is the same as the historic wfDebug |
| 251 | // method: emit if $wgDebugLogFile has been set. |
| 252 | $shouldEmit = $wgDebugLogFile != ''; |
| 253 | } |
| 254 | |
| 255 | return $shouldEmit; |
| 256 | } |
| 257 | |
| 258 | /** |
| 259 | * Format a message. |
| 260 | * |
| 261 | * Messages to the 'wfDebug' and 'wfLogDBError' channels receive special formatting to mimic the |
| 262 | * historic output of the functions of the same name. All other channel values are formatted |
| 263 | * based on the historic output of the `wfDebugLog()` global function. |
| 264 | * |
| 265 | * @param string $channel |
| 266 | * @param string $message |
| 267 | * @param array $context |
| 268 | * @return string |
| 269 | */ |
| 270 | public static function format( $channel, $message, $context ) { |
| 271 | global $wgDebugLogGroups, $wgLogExceptionBacktrace; |
| 272 | |
| 273 | if ( $channel === 'wfDebug' ) { |
| 274 | $text = self::formatAsWfDebug( $channel, $message, $context ); |
| 275 | |
| 276 | } elseif ( $channel === 'wfLogDBError' ) { |
| 277 | $text = self::formatAsWfLogDBError( $channel, $message, $context ); |
| 278 | |
| 279 | } elseif ( !isset( $wgDebugLogGroups[$channel] ) ) { |
| 280 | $text = self::formatAsWfDebug( |
| 281 | $channel, "[{$channel}] {$message}", $context ); |
| 282 | |
| 283 | } else { |
| 284 | // Default formatting is wfDebugLog's historic style |
| 285 | $text = self::formatAsWfDebugLog( $channel, $message, $context ); |
| 286 | } |
| 287 | |
| 288 | // Append stacktrace of throwable if available |
| 289 | if ( $wgLogExceptionBacktrace && isset( $context['exception'] ) ) { |
| 290 | $e = $context['exception']; |
| 291 | $backtrace = false; |
| 292 | |
| 293 | if ( $e instanceof Throwable ) { |
| 294 | $backtrace = MWExceptionHandler::getRedactedTrace( $e ); |
| 295 | |
| 296 | } elseif ( is_array( $e ) && isset( $e['trace'] ) ) { |
| 297 | // Throwable has already been unpacked as structured data |
| 298 | $backtrace = $e['trace']; |
| 299 | } |
| 300 | |
| 301 | if ( $backtrace ) { |
| 302 | $text .= MWExceptionHandler::prettyPrintTrace( $backtrace ) . |
| 303 | "\n"; |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | return self::interpolate( $text, $context ); |
| 308 | } |
| 309 | |
| 310 | /** |
| 311 | * Format a message as `wfDebug()` would have formatted it. |
| 312 | * |
| 313 | * @param string $channel |
| 314 | * @param string $message |
| 315 | * @param array $context |
| 316 | * @return string |
| 317 | */ |
| 318 | protected static function formatAsWfDebug( $channel, $message, $context ) { |
| 319 | $text = preg_replace( '![\x00-\x08\x0b\x0c\x0e-\x1f]!', ' ', $message ); |
| 320 | if ( isset( $context['seconds_elapsed'] ) ) { |
| 321 | // Prepend elapsed request time and real memory usage with two |
| 322 | // trailing spaces. |
| 323 | $text = "{$context['seconds_elapsed']} {$context['memory_used']} {$text}"; |
| 324 | } |
| 325 | if ( isset( $context['prefix'] ) ) { |
| 326 | $text = "{$context['prefix']}{$text}"; |
| 327 | } |
| 328 | return "{$text}\n"; |
| 329 | } |
| 330 | |
| 331 | /** |
| 332 | * Format a message as `wfLogDBError()` would have formatted it. |
| 333 | * |
| 334 | * @param string $channel |
| 335 | * @param string $message |
| 336 | * @param array $context |
| 337 | * @return string |
| 338 | */ |
| 339 | protected static function formatAsWfLogDBError( $channel, $message, $context ) { |
| 340 | global $wgDBerrorLogTZ; |
| 341 | static $cachedTimezone = null; |
| 342 | |
| 343 | if ( !$cachedTimezone ) { |
| 344 | $cachedTimezone = new DateTimeZone( $wgDBerrorLogTZ ); |
| 345 | } |
| 346 | |
| 347 | $d = date_create( 'now', $cachedTimezone ); |
| 348 | $date = $d->format( 'D M j G:i:s T Y' ); |
| 349 | |
| 350 | $host = wfHostname(); |
| 351 | $wiki = WikiMap::getCurrentWikiId(); |
| 352 | |
| 353 | $text = "{$date}\t{$host}\t{$wiki}\t{$message}\n"; |
| 354 | return $text; |
| 355 | } |
| 356 | |
| 357 | /** |
| 358 | * Format a message as `wfDebugLog() would have formatted it. |
| 359 | * |
| 360 | * @param string $channel |
| 361 | * @param string $message |
| 362 | * @param array $context |
| 363 | * @return string |
| 364 | */ |
| 365 | protected static function formatAsWfDebugLog( $channel, $message, $context ) { |
| 366 | $time = ConvertibleTimestamp::now( TS::DB ); |
| 367 | $wiki = WikiMap::getCurrentWikiId(); |
| 368 | $host = wfHostname(); |
| 369 | $text = "{$time} {$host} {$wiki}: {$message}\n"; |
| 370 | return $text; |
| 371 | } |
| 372 | |
| 373 | /** |
| 374 | * Interpolate placeholders in logging message. |
| 375 | * |
| 376 | * @param string $message |
| 377 | * @param array $context |
| 378 | * @return string Interpolated message |
| 379 | */ |
| 380 | public static function interpolate( $message, array $context ) { |
| 381 | if ( str_contains( $message, '{' ) ) { |
| 382 | $replace = []; |
| 383 | foreach ( $context as $key => $val ) { |
| 384 | $replace['{' . $key . '}'] = self::flatten( $val ); |
| 385 | } |
| 386 | $message = strtr( $message, $replace ); |
| 387 | } |
| 388 | return $message; |
| 389 | } |
| 390 | |
| 391 | /** |
| 392 | * Convert a logging context element to a string suitable for |
| 393 | * interpolation. |
| 394 | * |
| 395 | * @param mixed $item |
| 396 | * @return string |
| 397 | */ |
| 398 | protected static function flatten( $item ) { |
| 399 | if ( $item === null ) { |
| 400 | return '[Null]'; |
| 401 | } |
| 402 | |
| 403 | if ( is_bool( $item ) ) { |
| 404 | return $item ? 'true' : 'false'; |
| 405 | } |
| 406 | |
| 407 | if ( is_float( $item ) ) { |
| 408 | if ( is_infinite( $item ) ) { |
| 409 | return ( $item > 0 ? '' : '-' ) . 'INF'; |
| 410 | } |
| 411 | if ( is_nan( $item ) ) { |
| 412 | return 'NaN'; |
| 413 | } |
| 414 | return (string)$item; |
| 415 | } |
| 416 | |
| 417 | if ( is_scalar( $item ) ) { |
| 418 | return (string)$item; |
| 419 | } |
| 420 | |
| 421 | if ( is_array( $item ) ) { |
| 422 | return '[Array(' . count( $item ) . ')]'; |
| 423 | } |
| 424 | |
| 425 | if ( $item instanceof \DateTime ) { |
| 426 | return $item->format( 'c' ); |
| 427 | } |
| 428 | |
| 429 | if ( $item instanceof Throwable ) { |
| 430 | $which = $item instanceof Error ? 'Error' : 'Exception'; |
| 431 | return '[' . $which . ' ' . get_class( $item ) . '( ' . |
| 432 | $item->getFile() . ':' . $item->getLine() . ') ' . |
| 433 | $item->getMessage() . ']'; |
| 434 | } |
| 435 | |
| 436 | if ( is_object( $item ) ) { |
| 437 | if ( method_exists( $item, '__toString' ) ) { |
| 438 | return (string)$item; |
| 439 | } |
| 440 | |
| 441 | return '[Object ' . get_class( $item ) . ']'; |
| 442 | } |
| 443 | |
| 444 | // phpcs:ignore MediaWiki.Usage.ForbiddenFunctions.is_resource |
| 445 | if ( is_resource( $item ) ) { |
| 446 | return '[Resource ' . get_resource_type( $item ) . ']'; |
| 447 | } |
| 448 | |
| 449 | return '[Unknown ' . get_debug_type( $item ) . ']'; |
| 450 | } |
| 451 | |
| 452 | /** |
| 453 | * Select the appropriate log output destination for the given log event. |
| 454 | * |
| 455 | * If the event context contains 'destination' |
| 456 | * |
| 457 | * @param string $channel |
| 458 | * @param string $message |
| 459 | * @param array $context |
| 460 | * @return string |
| 461 | */ |
| 462 | protected static function destination( $channel, $message, $context ) { |
| 463 | global $wgDebugLogFile, $wgDBerrorLog, $wgDebugLogGroups; |
| 464 | |
| 465 | // Default destination is the debug log file as historically used by |
| 466 | // the wfDebug function. |
| 467 | $destination = $wgDebugLogFile; |
| 468 | |
| 469 | if ( isset( $context['destination'] ) ) { |
| 470 | // Use destination explicitly provided in context |
| 471 | $destination = $context['destination']; |
| 472 | |
| 473 | } elseif ( $channel === 'wfDebug' ) { |
| 474 | $destination = $wgDebugLogFile; |
| 475 | |
| 476 | } elseif ( $channel === 'wfLogDBError' ) { |
| 477 | $destination = $wgDBerrorLog; |
| 478 | |
| 479 | } elseif ( isset( $wgDebugLogGroups[$channel] ) ) { |
| 480 | $logConfig = $wgDebugLogGroups[$channel]; |
| 481 | |
| 482 | if ( is_array( $logConfig ) ) { |
| 483 | $destination = $logConfig['destination']; |
| 484 | } else { |
| 485 | $destination = strval( $logConfig ); |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | return $destination; |
| 490 | } |
| 491 | |
| 492 | /** |
| 493 | * Log to a file without getting "file size exceeded" signals. |
| 494 | * |
| 495 | * Can also log to UDP with the syntax udp://host:port/prefix. This will send |
| 496 | * lines to the specified port, prefixed by the specified prefix and a space. |
| 497 | * |
| 498 | * @param string $text |
| 499 | * @param string $file Filename |
| 500 | */ |
| 501 | public static function emit( $text, $file ) { |
| 502 | if ( str_starts_with( $file, 'udp:' ) ) { |
| 503 | $transport = UDPTransport::newFromString( $file ); |
| 504 | $transport->emit( $text ); |
| 505 | } else { |
| 506 | // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged |
| 507 | $exists = @file_exists( $file ); |
| 508 | // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged |
| 509 | $size = $exists ? @filesize( $file ) : false; |
| 510 | if ( !$exists || |
| 511 | ( $size !== false && $size + strlen( $text ) < 0x7fffffff ) |
| 512 | ) { |
| 513 | // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged |
| 514 | @file_put_contents( $file, $text, FILE_APPEND ); |
| 515 | } |
| 516 | } |
| 517 | } |
| 518 | |
| 519 | /** |
| 520 | * If MW_LOG_STDERR is set (used currently in `composer serve`) then also |
| 521 | * emit to stderr using error_log(). |
| 522 | * |
| 523 | * @param string $text |
| 524 | * @return void |
| 525 | */ |
| 526 | private function maybeLogToStderr( string $text ): void { |
| 527 | if ( getenv( 'MW_LOG_STDERR' ) ) { |
| 528 | error_log( trim( $text ) ); |
| 529 | } |
| 530 | } |
| 531 | |
| 532 | } |