Expose $wgMaxArticleSize in siteinfo query api

[mediawiki.git] / includes / debug / MWDebug.php

<?php
/**
 * Debug toolbar related code.
 *
 * 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
 */

/**
 * New debugger system that outputs a toolbar on page view.
 *
 * By default, most methods do nothing ( self::$enabled = false ). You have
 * to explicitly call MWDebug::init() to enabled them.
 *
 * @since 1.19
 */
class MWDebug {
        /**
         * Log lines
         *
         * @var array $log
         */
        protected static $log = [];

        /**
         * Debug messages from wfDebug().
         *
         * @var array $debug
         */
        protected static $debug = [];

        /**
         * SQL statements of the database queries.
         *
         * @var array $query
         */
        protected static $query = [];

        /**
         * Is the debugger enabled?
         *
         * @var bool $enabled
         */
        protected static $enabled = false;

        /**
         * Array of functions that have already been warned, formatted
         * function-caller to prevent a buttload of warnings
         *
         * @var array $deprecationWarnings
         */
        protected static $deprecationWarnings = [];

        /**
         * Enabled the debugger and load resource module.
         * This is called by Setup.php when $wgDebugToolbar is true.
         *
         * @since 1.19
         */
        public static function init() {
                self::$enabled = true;
        }

        /**
         * Disable the debugger.
         *
         * @since 1.28
         */
        public static function deinit() {
                self::$enabled = false;
        }

        /**
         * Add ResourceLoader modules to the OutputPage object if debugging is
         * enabled.
         *
         * @since 1.19
         * @param OutputPage $out
         */
        public static function addModules( OutputPage $out ) {
                if ( self::$enabled ) {
                        $out->addModules( 'mediawiki.debug.init' );
                }
        }

        /**
         * Adds a line to the log
         *
         * @since 1.19
         * @param mixed $str
         */
        public static function log( $str ) {
                if ( !self::$enabled ) {
                        return;
                }
                if ( !is_string( $str ) ) {
                        $str = print_r( $str, true );
                }
                self::$log[] = [
                        'msg' => htmlspecialchars( $str ),
                        'type' => 'log',
                        'caller' => wfGetCaller(),
                ];
        }

        /**
         * Returns internal log array
         * @since 1.19
         * @return array
         */
        public static function getLog() {
                return self::$log;
        }

        /**
         * Clears internal log array and deprecation tracking
         * @since 1.19
         */
        public static function clearLog() {
                self::$log = [];
                self::$deprecationWarnings = [];
        }

        /**
         * Adds a warning entry to the log
         *
         * @since 1.19
         * @param string $msg
         * @param int $callerOffset
         * @param int $level A PHP error level. See sendMessage()
         * @param string $log 'production' will always trigger a php error, 'auto'
         *    will trigger an error if $wgDevelopmentWarnings is true, and 'debug'
         *    will only write to the debug log(s).
         *
         * @return mixed
         */
        public static function warning( $msg, $callerOffset = 1, $level = E_USER_NOTICE, $log = 'auto' ) {
                global $wgDevelopmentWarnings;

                if ( $log === 'auto' && !$wgDevelopmentWarnings ) {
                        $log = 'debug';
                }

                if ( $log === 'debug' ) {
                        $level = false;
                }

                $callerDescription = self::getCallerDescription( $callerOffset );

                self::sendMessage( $msg, $callerDescription, 'warning', $level );

                if ( self::$enabled ) {
                        self::$log[] = [
                                'msg' => htmlspecialchars( $msg ),
                                'type' => 'warn',
                                'caller' => $callerDescription['func'],
                        ];
                }
        }

        /**
         * Show a warning that $function is deprecated.
         * This will send it to the following locations:
         * - Debug toolbar, with one item per function and caller, if $wgDebugToolbar
         *   is set to true.
         * - PHP's error log, with level E_USER_DEPRECATED, if $wgDevelopmentWarnings
         *   is set to true.
         * - MediaWiki's debug log, if $wgDevelopmentWarnings is set to false.
         *
         * @since 1.19
         * @param string $function Function that is deprecated.
         * @param string|bool $version Version in which the function was deprecated.
         * @param string|bool $component Component to which the function belongs.
         *    If false, it is assumbed the function is in MediaWiki core.
         * @param int $callerOffset How far up the callstack is the original
         *    caller. 2 = function that called the function that called
         *    MWDebug::deprecated() (Added in 1.20).
         */
        public static function deprecated( $function, $version = false,
                $component = false, $callerOffset = 2
        ) {
                $callerDescription = self::getCallerDescription( $callerOffset );
                $callerFunc = $callerDescription['func'];

                $sendToLog = true;

                // Check to see if there already was a warning about this function
                if ( isset( self::$deprecationWarnings[$function][$callerFunc] ) ) {
                        return;
                } elseif ( isset( self::$deprecationWarnings[$function] ) ) {
                        if ( self::$enabled ) {
                                $sendToLog = false;
                        } else {
                                return;
                        }
                }

                self::$deprecationWarnings[$function][$callerFunc] = true;

                if ( $version ) {
                        global $wgDeprecationReleaseLimit;
                        if ( $wgDeprecationReleaseLimit && $component === false ) {
                                # Strip -* off the end of $version so that branches can use the
                                # format #.##-branchname to avoid issues if the branch is merged into
                                # a version of MediaWiki later than what it was branched from
                                $comparableVersion = preg_replace( '/-.*$/', '', $version );

                                # If the comparableVersion is larger than our release limit then
                                # skip the warning message for the deprecation
                                if ( version_compare( $wgDeprecationReleaseLimit, $comparableVersion, '<' ) ) {
                                        $sendToLog = false;
                                }
                        }

                        $component = $component === false ? 'MediaWiki' : $component;
                        $msg = "Use of $function was deprecated in $component $version.";
                } else {
                        $msg = "Use of $function is deprecated.";
                }

                if ( $sendToLog ) {
                        global $wgDevelopmentWarnings; // we could have a more specific $wgDeprecationWarnings setting.
                        self::sendMessage(
                                $msg,
                                $callerDescription,
                                'deprecated',
                                $wgDevelopmentWarnings ? E_USER_DEPRECATED : false
                        );
                }

                if ( self::$enabled ) {
                        $logMsg = htmlspecialchars( $msg ) .
                                Html::rawElement( 'div', [ 'class' => 'mw-debug-backtrace' ],
                                        Html::element( 'span', [], 'Backtrace:' ) . wfBacktrace()
                                );

                        self::$log[] = [
                                'msg' => $logMsg,
                                'type' => 'deprecated',
                                'caller' => $callerFunc,
                        ];
                }
        }

        /**
         * Get an array describing the calling function at a specified offset.
         *
         * @param int $callerOffset How far up the callstack is the original
         *    caller. 0 = function that called getCallerDescription()
         * @return array Array with two keys: 'file' and 'func'
         */
        private static function getCallerDescription( $callerOffset ) {
                $callers = wfDebugBacktrace();

                if ( isset( $callers[$callerOffset] ) ) {
                        $callerfile = $callers[$callerOffset];
                        if ( isset( $callerfile['file'] ) && isset( $callerfile['line'] ) ) {
                                $file = $callerfile['file'] . ' at line ' . $callerfile['line'];
                        } else {
                                $file = '(internal function)';
                        }
                } else {
                        $file = '(unknown location)';
                }

                if ( isset( $callers[$callerOffset + 1] ) ) {
                        $callerfunc = $callers[$callerOffset + 1];
                        $func = '';
                        if ( isset( $callerfunc['class'] ) ) {
                                $func .= $callerfunc['class'] . '::';
                        }
                        if ( isset( $callerfunc['function'] ) ) {
                                $func .= $callerfunc['function'];
                        }
                } else {
                        $func = 'unknown';
                }

                return [ 'file' => $file, 'func' => $func ];
        }

        /**
         * Send a message to the debug log and optionally also trigger a PHP
         * error, depending on the $level argument.
         *
         * @param string $msg Message to send
         * @param array $caller Caller description get from getCallerDescription()
         * @param string $group Log group on which to send the message
         * @param int|bool $level Error level to use; set to false to not trigger an error
         */
        private static function sendMessage( $msg, $caller, $group, $level ) {
                $msg .= ' [Called from ' . $caller['func'] . ' in ' . $caller['file'] . ']';

                if ( $level !== false ) {
                        trigger_error( $msg, $level );
                }

                wfDebugLog( $group, $msg, 'private' );
        }

        /**
         * This is a method to pass messages from wfDebug to the pretty debugger.
         * Do NOT use this method, use MWDebug::log or wfDebug()
         *
         * @since 1.19
         * @param string $str
         * @param array $context
         */
        public static function debugMsg( $str, $context = [] ) {
                global $wgDebugComments, $wgShowDebug;

                if ( self::$enabled || $wgDebugComments || $wgShowDebug ) {
                        if ( $context ) {
                                $prefix = '';
                                if ( isset( $context['prefix'] ) ) {
                                        $prefix = $context['prefix'];
                                } elseif ( isset( $context['channel'] ) && $context['channel'] !== 'wfDebug' ) {
                                        $prefix = "[{$context['channel']}] ";
                                }
                                if ( isset( $context['seconds_elapsed'] ) && isset( $context['memory_used'] ) ) {
                                        $prefix .= "{$context['seconds_elapsed']} {$context['memory_used']}  ";
                                }
                                $str = $prefix . $str;
                        }
                        self::$debug[] = rtrim( UtfNormal\Validator::cleanUp( $str ) );
                }
        }

        /**
         * Begins profiling on a database query
         *
         * @since 1.19
         * @param string $sql
         * @param string $function
         * @param bool $isMaster
         * @return int ID number of the query to pass to queryTime or -1 if the
         *  debugger is disabled
         */
        public static function query( $sql, $function, $isMaster ) {
                if ( !self::$enabled ) {
                        return -1;
                }

                // Replace invalid UTF-8 chars with a square UTF-8 character
                // This prevents json_encode from erroring out due to binary SQL data
                $sql = preg_replace(
                        '/(
                                [\xC0-\xC1] # Invalid UTF-8 Bytes
                                | [\xF5-\xFF] # Invalid UTF-8 Bytes
                                | \xE0[\x80-\x9F] # Overlong encoding of prior code point
                                | \xF0[\x80-\x8F] # Overlong encoding of prior code point
                                | [\xC2-\xDF](?![\x80-\xBF]) # Invalid UTF-8 Sequence Start
                                | [\xE0-\xEF](?![\x80-\xBF]{2}) # Invalid UTF-8 Sequence Start
                                | [\xF0-\xF4](?![\x80-\xBF]{3}) # Invalid UTF-8 Sequence Start
                                | (?<=[\x0-\x7F\xF5-\xFF])[\x80-\xBF] # Invalid UTF-8 Sequence Middle
                                | (?<![\xC2-\xDF]|[\xE0-\xEF]|[\xE0-\xEF][\x80-\xBF]|[\xF0-\xF4]
                                   |[\xF0-\xF4][\x80-\xBF]|[\xF0-\xF4][\x80-\xBF]{2})[\x80-\xBF] # Overlong Sequence
                                | (?<=[\xE0-\xEF])[\x80-\xBF](?![\x80-\xBF]) # Short 3 byte sequence
                                | (?<=[\xF0-\xF4])[\x80-\xBF](?![\x80-\xBF]{2}) # Short 4 byte sequence
                                | (?<=[\xF0-\xF4][\x80-\xBF])[\x80-\xBF](?![\x80-\xBF]) # Short 4 byte sequence (2)
                        )/x',
                        '■',
                        $sql
                );

                // last check for invalid utf8
                $sql = UtfNormal\Validator::cleanUp( $sql );

                self::$query[] = [
                        'sql' => $sql,
                        'function' => $function,
                        'master' => (bool)$isMaster,
                        'time' => 0.0,
                        '_start' => microtime( true ),
                ];

                return count( self::$query ) - 1;
        }

        /**
         * Calculates how long a query took.
         *
         * @since 1.19
         * @param int $id
         */
        public static function queryTime( $id ) {
                if ( $id === -1 || !self::$enabled ) {
                        return;
                }

                self::$query[$id]['time'] = microtime( true ) - self::$query[$id]['_start'];
                unset( self::$query[$id]['_start'] );
        }

        /**
         * Returns a list of files included, along with their size
         *
         * @param IContextSource $context
         * @return array
         */
        protected static function getFilesIncluded( IContextSource $context ) {
                $files = get_included_files();
                $fileList = [];
                foreach ( $files as $file ) {
                        $size = filesize( $file );
                        $fileList[] = [
                                'name' => $file,
                                'size' => $context->getLanguage()->formatSize( $size ),
                        ];
                }

                return $fileList;
        }

        /**
         * Returns the HTML to add to the page for the toolbar
         *
         * @since 1.19
         * @param IContextSource $context
         * @return string
         */
        public static function getDebugHTML( IContextSource $context ) {
                global $wgDebugComments;

                $html = '';

                if ( self::$enabled ) {
                        MWDebug::log( 'MWDebug output complete' );
                        $debugInfo = self::getDebugInfo( $context );

                        // Cannot use OutputPage::addJsConfigVars because those are already outputted
                        // by the time this method is called.
                        $html = ResourceLoader::makeInlineScript(
                                ResourceLoader::makeConfigSetScript( [ 'debugInfo' => $debugInfo ] )
                        );
                }

                if ( $wgDebugComments ) {
                        $html .= "<!-- Debug output:\n" .
                                htmlspecialchars( implode( "\n", self::$debug ) ) .
                                "\n\n-->";
                }

                return $html;
        }

        /**
         * Generate debug log in HTML for displaying at the bottom of the main
         * content area.
         * If $wgShowDebug is false, an empty string is always returned.
         *
         * @since 1.20
         * @return string HTML fragment
         */
        public static function getHTMLDebugLog() {
                global $wgShowDebug;

                if ( !$wgShowDebug ) {
                        return '';
                }

                $ret = "\n<hr />\n<strong>Debug data:</strong><ul id=\"mw-debug-html\">\n";

                foreach ( self::$debug as $line ) {
                        $display = nl2br( htmlspecialchars( trim( $line ) ) );

                        $ret .= "<li><code>$display</code></li>\n";
                }

                $ret .= '</ul>' . "\n";

                return $ret;
        }

        /**
         * Append the debug info to given ApiResult
         *
         * @param IContextSource $context
         * @param ApiResult $result
         */
        public static function appendDebugInfoToApiResult( IContextSource $context, ApiResult $result ) {
                if ( !self::$enabled ) {
                        return;
                }

                // output errors as debug info, when display_errors is on
                // this is necessary for all non html output of the api, because that clears all errors first
                $obContents = ob_get_contents();
                if ( $obContents ) {
                        $obContentArray = explode( '<br />', $obContents );
                        foreach ( $obContentArray as $obContent ) {
                                if ( trim( $obContent ) ) {
                                        self::debugMsg( Sanitizer::stripAllTags( $obContent ) );
                                }
                        }
                }

                MWDebug::log( 'MWDebug output complete' );
                $debugInfo = self::getDebugInfo( $context );

                ApiResult::setIndexedTagName( $debugInfo, 'debuginfo' );
                ApiResult::setIndexedTagName( $debugInfo['log'], 'line' );
                ApiResult::setIndexedTagName( $debugInfo['debugLog'], 'msg' );
                ApiResult::setIndexedTagName( $debugInfo['queries'], 'query' );
                ApiResult::setIndexedTagName( $debugInfo['includes'], 'queries' );
                $result->addValue( null, 'debuginfo', $debugInfo );
        }

        /**
         * Returns the HTML to add to the page for the toolbar
         *
         * @param IContextSource $context
         * @return array
         */
        public static function getDebugInfo( IContextSource $context ) {
                if ( !self::$enabled ) {
                        return [];
                }

                global $wgVersion, $wgRequestTime;
                $request = $context->getRequest();

                // HHVM's reported memory usage from memory_get_peak_usage()
                // is not useful when passing false, but we continue passing
                // false for consistency of historical data in zend.
                // see: https://github.com/facebook/hhvm/issues/2257#issuecomment-39362246
                $realMemoryUsage = wfIsHHVM();

                return [
                        'mwVersion' => $wgVersion,
                        'phpEngine' => wfIsHHVM() ? 'HHVM' : 'PHP',
                        'phpVersion' => wfIsHHVM() ? HHVM_VERSION : PHP_VERSION,
                        'gitRevision' => GitInfo::headSHA1(),
                        'gitBranch' => GitInfo::currentBranch(),
                        'gitViewUrl' => GitInfo::headViewUrl(),
                        'time' => microtime( true ) - $wgRequestTime,
                        'log' => self::$log,
                        'debugLog' => self::$debug,
                        'queries' => self::$query,
                        'request' => [
                                'method' => $request->getMethod(),
                                'url' => $request->getRequestURL(),
                                'headers' => $request->getAllHeaders(),
                                'params' => $request->getValues(),
                        ],
                        'memory' => $context->getLanguage()->formatSize( memory_get_usage( $realMemoryUsage ) ),
                        'memoryPeak' => $context->getLanguage()->formatSize( memory_get_peak_usage( $realMemoryUsage ) ),
                        'includes' => self::getFilesIncluded( $context ),
                ];
        }
}