includes/debug/Debug.php

   1 <?php
   2 /**
   3  * Debug toolbar related code
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * New debugger system that outputs a toolbar on page view
  25  *
  26  * By default, most methods do nothing ( self::$enabled = false ). You have
  27  * to explicitly call MWDebug::init() to enabled them.
  28  *
  29  * @todo Profiler support
  30  *
  31  * @since 1.19
  32  */
  33 class MWDebug {
  34
  35         /**
  36          * Log lines
  37          *
  38          * @var array
  39          */
  40         protected static $log = array();
  41
  42         /**
  43          * Debug messages from wfDebug()
  44          *
  45          * @var array
  46          */
  47         protected static $debug = array();
  48
  49         /**
  50          * Queries
  51          *
  52          * @var array
  53          */
  54         protected static $query = array();
  55
  56         /**
  57          * Is the debugger enabled?
  58          *
  59          * @var bool
  60          */
  61         protected static $enabled = false;
  62
  63         /**
  64          * Array of functions that have already been warned, formatted
  65          * function-caller to prevent a buttload of warnings
  66          *
  67          * @var array
  68          */
  69         protected static $deprecationWarnings = array();
  70
  71         /**
  72          * Enabled the debugger and load resource module.
  73          * This is called by Setup.php when $wgDebugToolbar is true.
  74          *
  75          * @since 1.19
  76          */
  77         public static function init() {
  78                 self::$enabled = true;
  79         }
  80
  81         /**
  82          * Add ResourceLoader modules to the OutputPage object if debugging is
  83          * enabled.
  84          *
  85          * @since 1.19
  86          * @param $out OutputPage
  87          */
  88         public static function addModules( OutputPage $out ) {
  89                 if ( self::$enabled ) {
  90                         $out->addModules( 'mediawiki.debug.init' );
  91                 }
  92         }
  93
  94         /**
  95          * Adds a line to the log
  96          *
  97          * @todo Add support for passing objects
  98          *
  99          * @since 1.19
 100          * @param $str string
 101          */
 102         public static function log( $str ) {
 103                 if ( !self::$enabled ) {
 104                         return;
 105                 }
 106
 107                 self::$log[] = array(
 108                         'msg' => htmlspecialchars( $str ),
 109                         'type' => 'log',
 110                         'caller' => wfGetCaller(),
 111                 );
 112         }
 113
 114         /**
 115          * Returns internal log array
 116          * @since 1.19
 117          * @return array
 118          */
 119         public static function getLog() {
 120                 return self::$log;
 121         }
 122
 123         /**
 124          * Clears internal log array and deprecation tracking
 125          * @since 1.19
 126          */
 127         public static function clearLog() {
 128                 self::$log = array();
 129                 self::$deprecationWarnings = array();
 130         }
 131
 132         /**
 133          * Adds a warning entry to the log
 134          *
 135          * @since 1.19
 136          * @param $msg string
 137          * @param $callerOffset int
 138          * @param $level int A PHP error level. See sendWarning()
 139          * @return mixed
 140          */
 141         public static function warning( $msg, $callerOffset = 1, $level = E_USER_NOTICE ) {
 142                 $callerDescription = self::getCallerDescription( $callerOffset );
 143
 144                 self::sendWarning( $msg, $callerDescription, $level );
 145
 146                 if ( self::$enabled ) {
 147                         self::$log[] = array(
 148                                 'msg' => htmlspecialchars( $msg ),
 149                                 'type' => 'warn',
 150                                 'caller' => $callerDescription['func'],
 151                         );
 152                 }
 153         }
 154
 155         /**
 156          * Show a warning that $function is deprecated.
 157          * This will send it to the following locations:
 158          * - Debug toolbar, with one item per function and caller, if $wgDebugToolbar
 159          *   is set to true.
 160          * - PHP's error log, with level E_USER_DEPRECATED, if $wgDevelopmentWarnings
 161          *   is set to true.
 162          * - MediaWiki's debug log, if $wgDevelopmentWarnings is set to false.
 163          *
 164          * @since 1.19
 165          * @param $function string: Function that is deprecated.
 166          * @param $version string|bool: Version in which the function was deprecated.
 167          * @param $component string|bool: Component to which the function belongs.
 168          *     If false, it is assumbed the function is in MediaWiki core.
 169          * @param $callerOffset integer: How far up the callstack is the original
 170          *    caller. 2 = function that called the function that called
 171          *    MWDebug::deprecated() (Added in 1.20).
 172          * @return mixed
 173          */
 174         public static function deprecated( $function, $version = false, $component = false, $callerOffset = 2 ) {
 175                 $callerDescription = self::getCallerDescription( $callerOffset );
 176                 $callerFunc = $callerDescription['func'];
 177
 178                 $sendToLog = true;
 179
 180                 // Check to see if there already was a warning about this function
 181                 if ( isset( self::$deprecationWarnings[$function][$callerFunc] ) ) {
 182                         return;
 183                 } elseif ( isset( self::$deprecationWarnings[$function] ) ) {
 184                         if ( self::$enabled ) {
 185                                 $sendToLog = false;
 186                         } else {
 187                                 return;
 188                         }
 189                 }
 190
 191                 self::$deprecationWarnings[$function][$callerFunc] = true;
 192
 193                 if ( $version ) {
 194                         global $wgDeprecationReleaseLimit;
 195                         if ( $wgDeprecationReleaseLimit && $component === false ) {
 196                                 # Strip -* off the end of $version so that branches can use the
 197                                 # format #.##-branchname to avoid issues if the branch is merged into
 198                                 # a version of MediaWiki later than what it was branched from
 199                                 $comparableVersion = preg_replace( '/-.*$/', '', $version );
 200
 201                                 # If the comparableVersion is larger than our release limit then
 202                                 # skip the warning message for the deprecation
 203                                 if ( version_compare( $wgDeprecationReleaseLimit, $comparableVersion, '<' ) ) {
 204                                         $sendToLog = false;
 205                                 }
 206                         }
 207
 208                         $component = $component === false ? 'MediaWiki' : $component;
 209                         $msg = "Use of $function was deprecated in $component $version.";
 210                 } else {
 211                         $msg = "Use of $function is deprecated.";
 212                 }
 213
 214                 if ( $sendToLog ) {
 215                         self::sendWarning( $msg, $callerDescription, E_USER_DEPRECATED );
 216                 }
 217
 218                 if ( self::$enabled ) {
 219                         $logMsg = htmlspecialchars( $msg ) .
 220                                 Html::rawElement( 'div', array( 'class' => 'mw-debug-backtrace' ),
 221                                         Html::element( 'span', array(), 'Backtrace:' ) . wfBacktrace()
 222                                 );
 223
 224                         self::$log[] = array(
 225                                 'msg' => $logMsg,
 226                                 'type' => 'deprecated',
 227                                 'caller' => $callerFunc,
 228                         );
 229                 }
 230         }
 231
 232         /**
 233          * Get an array describing the calling function at a specified offset.
 234          *
 235          * @param $callerOffset integer: How far up the callstack is the original
 236          *    caller. 0 = function that called getCallerDescription()
 237          * @return array with two keys: 'file' and 'func'
 238          */
 239         private static function getCallerDescription( $callerOffset ) {
 240                 $callers = wfDebugBacktrace();
 241
 242                 if ( isset( $callers[$callerOffset] ) ) {
 243                         $callerfile = $callers[$callerOffset];
 244                         if ( isset( $callerfile['file'] ) && isset( $callerfile['line'] ) ) {
 245                                 $file = $callerfile['file'] . ' at line ' . $callerfile['line'];
 246                         } else {
 247                                 $file = '(internal function)';
 248                         }
 249                 } else {
 250                         $file = '(unknown location)';
 251                 }
 252
 253                 if ( isset( $callers[$callerOffset + 1] ) ) {
 254                         $callerfunc = $callers[$callerOffset + 1];
 255                         $func = '';
 256                         if ( isset( $callerfunc['class'] ) ) {
 257                                 $func .= $callerfunc['class'] . '::';
 258                         }
 259                         if ( isset( $callerfunc['function'] ) ) {
 260                                 $func .= $callerfunc['function'];
 261                         }
 262                 } else {
 263                         $func = 'unknown';
 264                 }
 265
 266                 return array( 'file' => $file, 'func' => $func );
 267         }
 268
 269         /**
 270          * Send a warning either to the debug log or by triggering an user PHP
 271          * error depending on $wgDevelopmentWarnings.
 272          *
 273          * @param $msg string Message to send
 274          * @param $caller array caller description get from getCallerDescription()
 275          * @param $level error level to use if $wgDevelopmentWarnings is true
 276          */
 277         private static function sendWarning( $msg, $caller, $level ) {
 278                 global $wgDevelopmentWarnings;
 279
 280                 $msg .= ' [Called from ' . $caller['func'] . ' in ' . $caller['file'] . ']';
 281
 282                 if ( $wgDevelopmentWarnings ) {
 283                         trigger_error( $msg, $level );
 284                 } else {
 285                         wfDebug( "$msg\n" );
 286                 }
 287         }
 288
 289         /**
 290          * This is a method to pass messages from wfDebug to the pretty debugger.
 291          * Do NOT use this method, use MWDebug::log or wfDebug()
 292          *
 293          * @since 1.19
 294          * @param $str string
 295          */
 296         public static function debugMsg( $str ) {
 297                 global $wgDebugComments, $wgShowDebug;
 298
 299                 if ( self::$enabled || $wgDebugComments || $wgShowDebug ) {
 300                         self::$debug[] = rtrim( $str );
 301                 }
 302         }
 303
 304         /**
 305          * Begins profiling on a database query
 306          *
 307          * @since 1.19
 308          * @param $sql string
 309          * @param $function string
 310          * @param $isMaster bool
 311          * @return int ID number of the query to pass to queryTime or -1 if the
 312          *  debugger is disabled
 313          */
 314         public static function query( $sql, $function, $isMaster ) {
 315                 if ( !self::$enabled ) {
 316                         return -1;
 317                 }
 318
 319                 self::$query[] = array(
 320                         'sql' => $sql,
 321                         'function' => $function,
 322                         'master' => (bool) $isMaster,
 323                         'time' => 0.0,
 324                         '_start' => microtime( true ),
 325                 );
 326
 327                 return count( self::$query ) - 1;
 328         }
 329
 330         /**
 331          * Calculates how long a query took.
 332          *
 333          * @since 1.19
 334          * @param $id int
 335          */
 336         public static function queryTime( $id ) {
 337                 if ( $id === -1 || !self::$enabled ) {
 338                         return;
 339                 }
 340
 341                 self::$query[$id]['time'] = microtime( true ) - self::$query[$id]['_start'];
 342                 unset( self::$query[$id]['_start'] );
 343         }
 344
 345         /**
 346          * Returns a list of files included, along with their size
 347          *
 348          * @param $context IContextSource
 349          * @return array
 350          */
 351         protected static function getFilesIncluded( IContextSource $context ) {
 352                 $files = get_included_files();
 353                 $fileList = array();
 354                 foreach ( $files as $file ) {
 355                         $size = filesize( $file );
 356                         $fileList[] = array(
 357                                 'name' => $file,
 358                                 'size' => $context->getLanguage()->formatSize( $size ),
 359                         );
 360                 }
 361
 362                 return $fileList;
 363         }
 364
 365         /**
 366          * Returns the HTML to add to the page for the toolbar
 367          *
 368          * @since 1.19
 369          * @param $context IContextSource
 370          * @return string
 371          */
 372         public static function getDebugHTML( IContextSource $context ) {
 373                 global $wgDebugComments;
 374
 375                 $html = '';
 376
 377                 if ( self::$enabled ) {
 378                         MWDebug::log( 'MWDebug output complete' );
 379                         $debugInfo = self::getDebugInfo( $context );
 380
 381                         // Cannot use OutputPage::addJsConfigVars because those are already outputted
 382                         // by the time this method is called.
 383                         $html = Html::inlineScript(
 384                                 ResourceLoader::makeLoaderConditionalScript(
 385                                         ResourceLoader::makeConfigSetScript( array( 'debugInfo' => $debugInfo ) )
 386                                 )
 387                         );
 388                 }
 389
 390                 if ( $wgDebugComments ) {
 391                         $html .= "<!-- Debug output:\n" .
 392                                 htmlspecialchars( implode( "\n", self::$debug ) ) .
 393                                 "\n\n-->";
 394                 }
 395
 396                 return $html;
 397         }
 398
 399         /**
 400          * Generate debug log in HTML for displaying at the bottom of the main
 401          * content area.
 402          * If $wgShowDebug is false, an empty string is always returned.
 403          *
 404          * @since 1.20
 405          * @return string HTML fragment
 406          */
 407         public static function getHTMLDebugLog() {
 408                 global $wgDebugTimestamps, $wgShowDebug;
 409
 410                 if ( !$wgShowDebug ) {
 411                         return '';
 412                 }
 413
 414                 $curIdent = 0;
 415                 $ret = "\n<hr />\n<strong>Debug data:</strong><ul id=\"mw-debug-html\">\n<li>";
 416
 417                 foreach ( self::$debug as $line ) {
 418                         $pre = '';
 419                         if ( $wgDebugTimestamps ) {
 420                                 $matches = array();
 421                                 if ( preg_match( '/^(\d+\.\d+ {1,3}\d+.\dM\s{2})/', $line, $matches ) ) {
 422                                         $pre = $matches[1];
 423                                         $line = substr( $line, strlen( $pre ) );
 424                                 }
 425                         }
 426                         $display = ltrim( $line );
 427                         $ident = strlen( $line ) - strlen( $display );
 428                         $diff = $ident - $curIdent;
 429
 430                         $display = $pre . $display;
 431                         if ( $display == '' ) {
 432                                 $display = "\xc2\xa0";
 433                         }
 434
 435                         if ( !$ident && $diff < 0 && substr( $display, 0, 9 ) != 'Entering ' && substr( $display, 0, 8 ) != 'Exiting ' ) {
 436                                 $ident = $curIdent;
 437                                 $diff = 0;
 438                                 $display = '<span style="background:yellow;">' . nl2br( htmlspecialchars( $display ) ) . '</span>';
 439                         } else {
 440                                 $display = nl2br( htmlspecialchars( $display ) );
 441                         }
 442
 443                         if ( $diff < 0 ) {
 444                                 $ret .= str_repeat( "</li></ul>\n", -$diff ) . "</li><li>\n";
 445                         } elseif ( $diff == 0 ) {
 446                                 $ret .= "</li><li>\n";
 447                         } else {
 448                                 $ret .= str_repeat( "<ul><li>\n", $diff );
 449                         }
 450                         $ret .= "<tt>$display</tt>\n";
 451
 452                         $curIdent = $ident;
 453                 }
 454
 455                 $ret .= str_repeat( '</li></ul>', $curIdent ) . "</li>\n</ul>\n";
 456
 457                 return $ret;
 458         }
 459
 460         /**
 461          * Append the debug info to given ApiResult
 462          *
 463          * @param $context IContextSource
 464          * @param $result ApiResult
 465          */
 466         public static function appendDebugInfoToApiResult( IContextSource $context, ApiResult $result ) {
 467                 if ( !self::$enabled ) {
 468                         return;
 469                 }
 470
 471                 // output errors as debug info, when display_errors is on
 472                 // this is necessary for all non html output of the api, because that clears all errors first
 473                 $obContents = ob_get_contents();
 474                 if( $obContents ) {
 475                         $obContentArray = explode( '<br />', $obContents );
 476                         foreach( $obContentArray as $obContent ) {
 477                                 if( trim( $obContent ) ) {
 478                                         self::debugMsg( Sanitizer::stripAllTags( $obContent ) );
 479                                 }
 480                         }
 481                 }
 482
 483                 MWDebug::log( 'MWDebug output complete' );
 484                 $debugInfo = self::getDebugInfo( $context );
 485
 486                 $result->setIndexedTagName( $debugInfo, 'debuginfo' );
 487                 $result->setIndexedTagName( $debugInfo['log'], 'line' );
 488                 foreach( $debugInfo['debugLog'] as $index => $debugLogText ) {
 489                         $vals = array();
 490                         ApiResult::setContent( $vals, $debugLogText );
 491                         $debugInfo['debugLog'][$index] = $vals; //replace
 492                 }
 493                 $result->setIndexedTagName( $debugInfo['debugLog'], 'msg' );
 494                 $result->setIndexedTagName( $debugInfo['queries'], 'query' );
 495                 $result->setIndexedTagName( $debugInfo['includes'], 'queries' );
 496                 $result->addValue( array(), 'debuginfo', $debugInfo );
 497         }
 498
 499         /**
 500          * Returns the HTML to add to the page for the toolbar
 501          *
 502          * @param $context IContextSource
 503          * @return array
 504          */
 505         public static function getDebugInfo( IContextSource $context ) {
 506                 if ( !self::$enabled ) {
 507                         return array();
 508                 }
 509
 510                 global $wgVersion, $wgRequestTime;
 511                 $request = $context->getRequest();
 512                 return array(
 513                         'mwVersion' => $wgVersion,
 514                         'phpVersion' => PHP_VERSION,
 515                         'gitRevision' => GitInfo::headSHA1(),
 516                         'gitBranch' => GitInfo::currentBranch(),
 517                         'gitViewUrl' => GitInfo::headViewUrl(),
 518                         'time' => microtime( true ) - $wgRequestTime,
 519                         'log' => self::$log,
 520                         'debugLog' => self::$debug,
 521                         'queries' => self::$query,
 522                         'request' => array(
 523                                 'method' => $request->getMethod(),
 524                                 'url' => $request->getRequestURL(),
 525                                 'headers' => $request->getAllHeaders(),
 526                                 'params' => $request->getValues(),
 527                         ),
 528                         'memory' => $context->getLanguage()->formatSize( memory_get_usage() ),
 529                         'memoryPeak' => $context->getLanguage()->formatSize( memory_get_peak_usage() ),
 530                         'includes' => self::getFilesIncluded( $context ),
 531                 );
 532         }
 533 }