*/
class MWExceptionHandler {
+ /**
+ * @var string $reservedMemory
+ */
protected static $reservedMemory;
+ /**
+ * @var array $fatalErrorTypes
+ */
protected static $fatalErrorTypes = array(
E_ERROR, E_PARSE, E_CORE_ERROR, E_COMPILE_ERROR, E_USER_ERROR,
/* HHVM's FATAL_ERROR level */ 16777217,
);
+ /**
+ * @var bool $handledFatalCallback
+ */
+ protected static $handledFatalCallback = false;
/**
* Install handlers with PHP.
*/
public static function installHandler() {
- set_exception_handler( array( 'MWExceptionHandler', 'handleException' ) );
- set_error_handler( array( 'MWExceptionHandler', 'handleError' ) );
+ set_exception_handler( 'MWExceptionHandler::handleException' );
+ set_error_handler( 'MWExceptionHandler::handleError' );
// Reserve 16k of memory so we can report OOM fatals
self::$reservedMemory = str_repeat( ' ', 16384 );
- register_shutdown_function(
- array( 'MWExceptionHandler', 'handleFatalError' )
- );
+ register_shutdown_function( 'MWExceptionHandler::handleFatalError' );
}
/**
}
/**
+ * Handler for set_error_handler() callback notifications.
+ *
+ * Receive a callback from the interpreter for a raised error, create an
+ * ErrorException, and log the exception to the 'error' logging
+ * channel(s). If the raised error is a fatal error type (only under HHVM)
+ * delegate to handleFatalError() instead.
+ *
* @since 1.25
+ *
* @param int $level Error level raised
* @param string $message
* @param string $file
* @param int $line
+ *
+ * @see logError()
*/
- public static function handleError( $level, $message, $file = null, $line = null ) {
- // Map error constant to error name (reverse-engineer PHP error reporting)
- $channel = 'error';
+ public static function handleError(
+ $level, $message, $file = null, $line = null
+ ) {
+ if ( in_array( $level, self::$fatalErrorTypes ) ) {
+ return call_user_func_array(
+ 'MWExceptionHandler::handleFatalError', func_get_args()
+ );
+ }
+
+ // Map error constant to error name (reverse-engineer PHP error
+ // reporting)
switch ( $level ) {
- case E_ERROR:
- case E_CORE_ERROR:
- case E_COMPILE_ERROR:
- case E_USER_ERROR:
case E_RECOVERABLE_ERROR:
- case E_PARSE:
$levelName = 'Error';
- $channel = 'fatal';
break;
case E_WARNING:
case E_CORE_WARNING:
case E_USER_DEPRECATED:
$levelName = 'Deprecated';
break;
- case /* HHVM's FATAL_ERROR */ 16777217:
- $levelName = 'Fatal';
- $channel = 'fatal';
- break;
default:
$levelName = 'Unknown error';
break;
}
$e = new ErrorException( "PHP $levelName: $message", 0, $level, $file, $line );
- self::logError( $e, $channel );
+ self::logError( $e, 'error' );
// This handler is for logging only. Return false will instruct PHP
// to continue regular handling.
/**
- * Look for a fatal error as the cause of the request termination and log
- * as an exception.
+ * Dual purpose callback used as both a set_error_handler() callback and
+ * a registered shutdown function. Receive a callback from the interpreter
+ * for a raised error or system shutdown, check for a fatal error, and log
+ * to the 'fatal' logging channel.
*
* Special handling is included for missing class errors as they may
* indicate that the user needs to install 3rd-party libraries via
* Composer or other means.
*
* @since 1.25
+ *
+ * @param int $level Error level raised
+ * @param string $message Error message
+ * @param string $file File that error was raised in
+ * @param int $line Line number error was raised at
+ * @param array $context Active symbol table point of error
+ * @param array $trace Backtrace at point of error (undocumented HHVM
+ * feature)
+ * @return bool Always returns false
*/
- public static function handleFatalError() {
+ public static function handleFatalError(
+ $level = null, $message = null, $file = null, $line = null,
+ $context = null, $trace = null
+ ) {
+ // Free reserved memory so that we have space to process OOM
+ // errors
self::$reservedMemory = null;
- $lastError = error_get_last();
- if ( $lastError &&
- isset( $lastError['type'] ) &&
- in_array( $lastError['type'], self::$fatalErrorTypes )
- ) {
- $msg = "Fatal Error: {$lastError['message']}";
- // HHVM: Class undefined: foo
- // PHP5: Class 'foo' not found
- if ( preg_match( "/Class (undefined: \w+|'\w+' not found)/",
- $lastError['message']
- ) ) {
- // @codingStandardsIgnoreStart Generic.Files.LineLength.TooLong
- $msg = <<<TXT
+ if ( $level === null ) {
+ // Called as a shutdown handler, get data from error_get_last()
+ if ( static::$handledFatalCallback ) {
+ // Already called once (probably as an error handler callback
+ // under HHVM) so don't log again.
+ return false;
+ }
+
+ $lastError = error_get_last();
+ if ( $lastError !== null ) {
+ $level = $lastError['type'];
+ $message = $lastError['message'];
+ $file = $lastError['file'];
+ $line = $lastError['line'];
+ } else {
+ $level = 0;
+ $message = '';
+ }
+ }
+
+ if ( !in_array( $level, self::$fatalErrorTypes ) ) {
+ // Only interested in fatal errors, others should have been
+ // handled by MWExceptionHandler::handleError
+ return false;
+ }
+
+ $msg = "[{exception_id}] PHP Fatal Error: {$message}";
+
+ // Look at message to see if this is a class not found failure
+ // HHVM: Class undefined: foo
+ // PHP5: Class 'foo' not found
+ if ( preg_match( "/Class (undefined: \w+|'\w+' not found)/", $msg ) ) {
+ // @codingStandardsIgnoreStart Generic.Files.LineLength.TooLong
+ $msg = <<<TXT
{$msg}
MediaWiki or an installed extension requires this class but it is not embedded directly in MediaWiki's git repository and must be installed separately by the end user.
Please see <a href="https://www.mediawiki.org/wiki/Download_from_Git#Fetch_external_libraries">mediawiki.org</a> for help on installing the required components.
TXT;
- // @codingStandardsIgnoreEnd
- }
- $e = new ErrorException( $msg, 0, $lastError['type'] );
- self::logError( $e, 'fatal' );
+ // @codingStandardsIgnoreEnd
}
+
+ // We can't just create an exception and log it as it is likely that
+ // the interpreter has unwound the stack already. If that is true the
+ // stacktrace we would get would be functionally empty. If however we
+ // have been called as an error handler callback *and* HHVM is in use
+ // we will have been provided with a useful stacktrace that we can
+ // log.
+ $trace = $trace ?: debug_backtrace();
+ $logger = LoggerFactory::getInstance( 'fatal' );
+ $logger->error( $msg, array(
+ 'exception' => array(
+ 'class' => 'ErrorException',
+ 'message' => "PHP Fatal Error: {$message}",
+ 'code' => $level,
+ 'file' => $file,
+ 'line' => $line,
+ 'trace' => static::redactTrace( $trace ),
+ ),
+ 'exception_id' => wfRandomString( 8 ),
+ ) );
+
+ // Remember call so we don't double process via HHVM's fatal
+ // notifications and the shutdown hook behavior
+ static::$handledFatalCallback = true;
+ return false;
}
/**
* @return array
*/
public static function getRedactedTrace( Exception $e ) {
+ return static::redactTrace( $e->getTrace() );
+ }
+
+ /**
+ * Redact a stacktrace generated by Exception::getTrace(),
+ * debug_backtrace() or similar means. Replaces each element in each
+ * frame's argument array with the name of its class (if the element is an
+ * object) or its type (if the element is a PHP primitive).
+ *
+ * @since 1.26
+ * @param array $trace Stacktrace
+ * @return array Stacktrace with arugment values converted to data types
+ */
+ public static function redactTrace( array $trace ) {
return array_map( function ( $frame ) {
if ( isset( $frame['args'] ) ) {
$frame['args'] = array_map( function ( $arg ) {
}, $frame['args'] );
}
return $frame;
- }, $e->getTrace() );
+ }, $trace );
}
/**
public static function getLogContext( Exception $e ) {
return array(
'exception' => $e,
+ 'exception_id' => static::getLogId( $e ),
);
}
*/
protected static function logError( ErrorException $e, $channel ) {
// The set_error_handler callback is independent from error_reporting.
- // Filter out unwanted errors manually (e.g. when MediaWiki\suppressWarnings is active).
+ // Filter out unwanted errors manually (e.g. when
+ // MediaWiki\suppressWarnings is active).
$suppressed = ( error_reporting() & $e->getSeverity() ) === 0;
if ( !$suppressed ) {
$logger = LoggerFactory::getInstance( $channel );
dépôts / lhc / web / wiklou.git / commitdiff