includes/debug/logger/monolog/LineFormatter.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\Monolog;
  22
  23 use Error;
  24 use Exception;
  25 use Monolog\Formatter\LineFormatter as MonologLineFormatter;
  26 use MWExceptionHandler;
  27 use Throwable;
  28
  29 /**
  30  * Formats incoming records into a one-line string.
  31  *
  32  * An 'exeception' in the log record's context will be treated specially.
  33  * It will be output for an '%exception%' placeholder in the format and
  34  * excluded from '%context%' output if the '%exception%' placeholder is
  35  * present.
  36  *
  37  * Throwables that are logged with this formatter will optional have their
  38  * stack traces appended. If that is done, MWExceptionHandler::redactedTrace()
  39  * will be used to redact the trace information.
  40  *
  41  * @since 1.26
  42  * @copyright © 2015 Wikimedia Foundation and contributors
  43  */
  44 class LineFormatter extends MonologLineFormatter {
  45
  46         /**
  47          * @param string|null $format The format of the message
  48          * @param string|null $dateFormat The format of the timestamp: one supported by DateTime::format
  49          * @param bool $allowInlineLineBreaks Whether to allow inline line breaks in log entries
  50          * @param bool $ignoreEmptyContextAndExtra
  51          * @param bool $includeStacktraces
  52          */
  53         public function __construct(
  54                 $format = null, $dateFormat = null, $allowInlineLineBreaks = false,
  55                 $ignoreEmptyContextAndExtra = false, $includeStacktraces = false
  56         ) {
  57                 parent::__construct(
  58                         $format, $dateFormat, $allowInlineLineBreaks,
  59                         $ignoreEmptyContextAndExtra
  60                 );
  61                 $this->includeStacktraces( $includeStacktraces );
  62         }
  63
  64         /**
  65          * @inheritDoc
  66          */
  67         public function format( array $record ) {
  68                 // Drop the 'private' flag from the context
  69                 unset( $record['context']['private'] );
  70
  71                 // Handle exceptions specially: pretty format and remove from context
  72                 // Will be output for a '%exception%' placeholder in format
  73                 $prettyException = '';
  74                 if ( isset( $record['context']['exception'] ) &&
  75                         strpos( $this->format, '%exception%' ) !== false
  76                 ) {
  77                         $e = $record['context']['exception'];
  78                         unset( $record['context']['exception'] );
  79
  80                         if ( $e instanceof Throwable || $e instanceof Exception ) {
  81                                 $prettyException = $this->normalizeException( $e );
  82                         } elseif ( is_array( $e ) ) {
  83                                 $prettyException = $this->normalizeExceptionArray( $e );
  84                         } else {
  85                                 $prettyException = $this->stringify( $e );
  86                         }
  87                 }
  88
  89                 $output = parent::format( $record );
  90
  91                 if ( strpos( $output, '%exception%' ) !== false ) {
  92                         $output = str_replace( '%exception%', $prettyException, $output );
  93                 }
  94                 return $output;
  95         }
  96
  97         /**
  98          * Convert a Throwable to a string.
  99          *
 100          * @param Exception|Throwable $e
 101          * @return string
 102          */
 103         protected function normalizeException( $e ) {
 104                 return $this->normalizeExceptionArray( $this->exceptionAsArray( $e ) );
 105         }
 106
 107         /**
 108          * Convert a throwable to an array of structured data.
 109          *
 110          * @param Exception|Throwable $e
 111          * @return array
 112          */
 113         protected function exceptionAsArray( $e ) {
 114                 $out = [
 115                         'class' => get_class( $e ),
 116                         'message' => $e->getMessage(),
 117                         'code' => $e->getCode(),
 118                         'file' => $e->getFile(),
 119                         'line' => $e->getLine(),
 120                         'trace' => MWExceptionHandler::redactTrace( $e->getTrace() ),
 121                 ];
 122
 123                 $prev = $e->getPrevious();
 124                 if ( $prev ) {
 125                         $out['previous'] = $this->exceptionAsArray( $prev );
 126                 }
 127
 128                 return $out;
 129         }
 130
 131         /**
 132          * Convert an array of Throwable data to a string.
 133          *
 134          * @param array $e
 135          * @return string
 136          */
 137         protected function normalizeExceptionArray( array $e ) {
 138                 $defaults = [
 139                         'class' => 'Unknown',
 140                         'file' => 'unknown',
 141                         'line' => null,
 142                         'message' => 'unknown',
 143                         'trace' => [],
 144                 ];
 145                 $e = array_merge( $defaults, $e );
 146
 147                 $which = is_a( $e['class'], Error::class, true ) ? 'Error' : 'Exception';
 148                 $str = "\n[$which {$e['class']}] (" .
 149                         "{$e['file']}:{$e['line']}) {$e['message']}";
 150
 151                 if ( $this->includeStacktraces && $e['trace'] ) {
 152                         $str .= "\n" .
 153                                 MWExceptionHandler::prettyPrintTrace( $e['trace'], '  ' );
 154                 }
 155
 156                 if ( isset( $e['previous'] ) ) {
 157                         $prev = $e['previous'];
 158                         while ( $prev ) {
 159                                 $prev = array_merge( $defaults, $prev );
 160                                 $which = is_a( $prev['class'], Error::class, true ) ? 'Error' : 'Exception';
 161                                 $str .= "\nCaused by: [$which {$prev['class']}] (" .
 162                                         "{$prev['file']}:{$prev['line']}) {$prev['message']}";
 163
 164                                 if ( $this->includeStacktraces && $prev['trace'] ) {
 165                                         $str .= "\n" .
 166                                                 MWExceptionHandler::prettyPrintTrace(
 167                                                         $prev['trace'], '  '
 168                                                 );
 169                                 }
 170
 171                                 $prev = $prev['previous'] ?? null;
 172                         }
 173                 }
 174                 return $str;
 175         }
 176 }