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use Psr\Log\LogLevel; use Psr\Log\LoggerInterface; use Symfony\Component\Debug\Exception\ContextErrorException; use Symfony\Component\Debug\Exception\FatalErrorException; use Symfony\Component\Debug\Exception\FatalThrowableError; use Symfony\Component\Debug\Exception\OutOfMemoryException; use Symfony\Component\Debug\Exception\SilencedErrorContext; use Symfony\Component\Debug\FatalErrorHandler\UndefinedFunctionFatalErrorHandler; use Symfony\Component\Debug\FatalErrorHandler\UndefinedMethodFatalErrorHandler; use Symfony\Component\Debug\FatalErrorHandler\ClassNotFoundFatalErrorHandler; use Symfony\Component\Debug\FatalErrorHandler\FatalErrorHandlerInterface; /** * A generic ErrorHandler for the PHP engine. * * Provides five bit fields that control how errors are handled: * - thrownErrors: errors thrown as \ErrorException * - loggedErrors: logged errors, when not @-silenced * - scopedErrors: errors thrown or logged with their local context * - tracedErrors: errors logged with their stack trace * - screamedErrors: never @-silenced errors * * Each error level can be logged by a dedicated PSR-3 logger object. * Screaming only applies to logging. * Throwing takes precedence over logging. * Uncaught exceptions are logged as E_ERROR. * E_DEPRECATED and E_USER_DEPRECATED levels never throw. * E_RECOVERABLE_ERROR and E_USER_ERROR levels always throw. * Non catchable errors that can be detected at shutdown time are logged when the scream bit field allows so. * As errors have a performance cost, repeated errors are all logged, so that the developer * can see them and weight them as more important to fix than others of the same level. * * @author Nicolas Grekas * @author Grégoire Pineau */ class ErrorHandler { private $levels = array( E_DEPRECATED => 'Deprecated', E_USER_DEPRECATED => 'User Deprecated', E_NOTICE => 'Notice', E_USER_NOTICE => 'User Notice', E_STRICT => 'Runtime Notice', E_WARNING => 'Warning', E_USER_WARNING => 'User Warning', E_COMPILE_WARNING => 'Compile Warning', E_CORE_WARNING => 'Core Warning', E_USER_ERROR => 'User Error', E_RECOVERABLE_ERROR => 'Catchable Fatal Error', E_COMPILE_ERROR => 'Compile Error', E_PARSE => 'Parse Error', E_ERROR => 'Error', E_CORE_ERROR => 'Core Error', ); private $loggers = array( E_DEPRECATED => array(null, LogLevel::INFO), E_USER_DEPRECATED => array(null, LogLevel::INFO), E_NOTICE => array(null, LogLevel::WARNING), E_USER_NOTICE => array(null, LogLevel::WARNING), E_STRICT => array(null, LogLevel::WARNING), E_WARNING => array(null, LogLevel::WARNING), E_USER_WARNING => array(null, LogLevel::WARNING), E_COMPILE_WARNING => array(null, LogLevel::WARNING), E_CORE_WARNING => array(null, LogLevel::WARNING), E_USER_ERROR => array(null, LogLevel::CRITICAL), E_RECOVERABLE_ERROR => array(null, LogLevel::CRITICAL), E_COMPILE_ERROR => array(null, LogLevel::CRITICAL), E_PARSE => array(null, LogLevel::CRITICAL), E_ERROR => array(null, LogLevel::CRITICAL), E_CORE_ERROR => array(null, LogLevel::CRITICAL), ); private $thrownErrors = 0x1FFF; // E_ALL - E_DEPRECATED - E_USER_DEPRECATED private $scopedErrors = 0x1FFF; // E_ALL - E_DEPRECATED - E_USER_DEPRECATED private $tracedErrors = 0x77FB; // E_ALL - E_STRICT - E_PARSE private $screamedErrors = 0x55; // E_ERROR + E_CORE_ERROR + E_COMPILE_ERROR + E_PARSE private $loggedErrors = 0; private $traceReflector; private $isRecursive = 0; private $isRoot = false; private $exceptionHandler; private $bootstrappingLogger; private static $reservedMemory; private static $stackedErrors = array(); private static $stackedErrorLevels = array(); private static $toStringException = null; private static $silencedErrorCache = array(); private static $silencedErrorCount = 0; private static $exitCode = 0; /** * Registers the error handler. * * @param self|null $handler The handler to register * @param bool $replace Whether to replace or not any existing handler * * @return self The registered error handler */ public static function register(self $handler = null, $replace = true) { if (null === self::$reservedMemory) { self::$reservedMemory = str_repeat('x', 10240); register_shutdown_function(__CLASS__.'::handleFatalError'); } if ($handlerIsNew = null === $handler) { $handler = new static(); } if (null === $prev = set_error_handler(array($handler, 'handleError'))) { restore_error_handler(); // Specifying the error types earlier would expose us to https://bugs.php.net/63206 set_error_handler(array($handler, 'handleError'), $handler->thrownErrors | $handler->loggedErrors); $handler->isRoot = true; } if ($handlerIsNew && is_array($prev) && $prev[0] instanceof self) { $handler = $prev[0]; $replace = false; } if (!$replace && $prev) { restore_error_handler(); $handlerIsRegistered = is_array($prev) && $handler === $prev[0]; } else { $handlerIsRegistered = true; } if (is_array($prev = set_exception_handler(array($handler, 'handleException'))) && $prev[0] instanceof self) { restore_exception_handler(); if (!$handlerIsRegistered) { $handler = $prev[0]; } elseif ($handler !== $prev[0] && $replace) { set_exception_handler(array($handler, 'handleException')); $p = $prev[0]->setExceptionHandler(null); $handler->setExceptionHandler($p); $prev[0]->setExceptionHandler($p); } } else { $handler->setExceptionHandler($prev); } $handler->throwAt(E_ALL & $handler->thrownErrors, true); return $handler; } public function __construct(BufferingLogger $bootstrappingLogger = null) { if ($bootstrappingLogger) { $this->bootstrappingLogger = $bootstrappingLogger; $this->setDefaultLogger($bootstrappingLogger); } $this->traceReflector = new \ReflectionProperty('Exception', 'trace'); $this->traceReflector->setAccessible(true); } /** * Sets a logger to non assigned errors levels. * * @param LoggerInterface $logger A PSR-3 logger to put as default for the given levels * @param array|int $levels An array map of E_* to LogLevel::* or an integer bit field of E_* constants * @param bool $replace Whether to replace or not any existing logger */ public function setDefaultLogger(LoggerInterface $logger, $levels = E_ALL, $replace = false) { $loggers = array(); if (is_array($levels)) { foreach ($levels as $type => $logLevel) { if (empty($this->loggers[$type][0]) || $replace || $this->loggers[$type][0] === $this->bootstrappingLogger) { $loggers[$type] = array($logger, $logLevel); } } } else { if (null === $levels) { $levels = E_ALL; } foreach ($this->loggers as $type => $log) { if (($type & $levels) && (empty($log[0]) || $replace || $log[0] === $this->bootstrappingLogger)) { $log[0] = $logger; $loggers[$type] = $log; } } } $this->setLoggers($loggers); } /** * Sets a logger for each error level. * * @param array $loggers Error levels to [LoggerInterface|null, LogLevel::*] map * * @return array The previous map * * @throws \InvalidArgumentException */ public function setLoggers(array $loggers) { $prevLogged = $this->loggedErrors; $prev = $this->loggers; $flush = array(); foreach ($loggers as $type => $log) { if (!isset($prev[$type])) { throw new \InvalidArgumentException('Unknown error type: '.$type); } if (!is_array($log)) { $log = array($log); } elseif (!array_key_exists(0, $log)) { throw new \InvalidArgumentException('No logger provided'); } if (null === $log[0]) { $this->loggedErrors &= ~$type; } elseif ($log[0] instanceof LoggerInterface) { $this->loggedErrors |= $type; } else { throw new \InvalidArgumentException('Invalid logger provided'); } $this->loggers[$type] = $log + $prev[$type]; if ($this->bootstrappingLogger && $prev[$type][0] === $this->bootstrappingLogger) { $flush[$type] = $type; } } $this->reRegister($prevLogged | $this->thrownErrors); if ($flush) { foreach ($this->bootstrappingLogger->cleanLogs() as $log) { $type = $log[2]['exception'] instanceof \ErrorException ? $log[2]['exception']->getSeverity() : E_ERROR; if (!isset($flush[$type])) { $this->bootstrappingLogger->log($log[0], $log[1], $log[2]); } elseif ($this->loggers[$type][0]) { $this->loggers[$type][0]->log($this->loggers[$type][1], $log[1], $log[2]); } } } return $prev; } /** * Sets a user exception handler. * * @param callable $handler A handler that will be called on Exception * * @return callable|null The previous exception handler */ public function setExceptionHandler(callable $handler = null) { $prev = $this->exceptionHandler; $this->exceptionHandler = $handler; return $prev; } /** * Sets the PHP error levels that throw an exception when a PHP error occurs. * * @param int $levels A bit field of E_* constants for thrown errors * @param bool $replace Replace or amend the previous value * * @return int The previous value */ public function throwAt($levels, $replace = false) { $prev = $this->thrownErrors; $this->thrownErrors = ($levels | E_RECOVERABLE_ERROR | E_USER_ERROR) & ~E_USER_DEPRECATED & ~E_DEPRECATED; if (!$replace) { $this->thrownErrors |= $prev; } $this->reRegister($prev | $this->loggedErrors); return $prev; } /** * Sets the PHP error levels for which local variables are preserved. * * @param int $levels A bit field of E_* constants for scoped errors * @param bool $replace Replace or amend the previous value * * @return int The previous value */ public function scopeAt($levels, $replace = false) { $prev = $this->scopedErrors; $this->scopedErrors = (int) $levels; if (!$replace) { $this->scopedErrors |= $prev; } return $prev; } /** * Sets the PHP error levels for which the stack trace is preserved. * * @param int $levels A bit field of E_* constants for traced errors * @param bool $replace Replace or amend the previous value * * @return int The previous value */ public function traceAt($levels, $replace = false) { $prev = $this->tracedErrors; $this->tracedErrors = (int) $levels; if (!$replace) { $this->tracedErrors |= $prev; } return $prev; } /** * Sets the error levels where the @-operator is ignored. * * @param int $levels A bit field of E_* constants for screamed errors * @param bool $replace Replace or amend the previous value * * @return int The previous value */ public function screamAt($levels, $replace = false) { $prev = $this->screamedErrors; $this->screamedErrors = (int) $levels; if (!$replace) { $this->screamedErrors |= $prev; } return $prev; } /** * Re-registers as a PHP error handler if levels changed. */ private function reRegister($prev) { if ($prev !== $this->thrownErrors | $this->loggedErrors) { $handler = set_error_handler('var_dump'); $handler = is_array($handler) ? $handler[0] : null; restore_error_handler(); if ($handler === $this) { restore_error_handler(); if ($this->isRoot) { set_error_handler(array($this, 'handleError'), $this->thrownErrors | $this->loggedErrors); } else { set_error_handler(array($this, 'handleError')); } } } } /** * Handles errors by filtering then logging them according to the configured bit fields. * * @param int $type One of the E_* constants * @param string $message * @param string $file * @param int $line * * @return bool Returns false when no handling happens so that the PHP engine can handle the error itself * * @throws \ErrorException When $this->thrownErrors requests so * * @internal */ public function handleError($type, $message, $file, $line) { // Level is the current error reporting level to manage silent error. // Strong errors are not authorized to be silenced. $level = error_reporting() | E_RECOVERABLE_ERROR | E_USER_ERROR | E_DEPRECATED | E_USER_DEPRECATED; $log = $this->loggedErrors & $type; $throw = $this->thrownErrors & $type & $level; $type &= $level | $this->screamedErrors; if (!$type || (!$log && !$throw)) { return $type && $log; } $scope = $this->scopedErrors & $type; if (4 < $numArgs = func_num_args()) { $context = $scope ? (func_get_arg(4) ?: array()) : array(); $backtrace = 5 < $numArgs ? func_get_arg(5) : null; // defined on HHVM } else { $context = array(); $backtrace = null; } if (isset($context['GLOBALS']) && $scope) { $e = $context; // Whatever the signature of the method, unset($e['GLOBALS'], $context); // $context is always a reference in 5.3 $context = $e; } if (null !== $backtrace && $type & E_ERROR) { // E_ERROR fatal errors are triggered on HHVM when // hhvm.error_handling.call_user_handler_on_fatals=1 // which is the way to get their backtrace. $this->handleFatalError(compact('type', 'message', 'file', 'line', 'backtrace')); return true; } $logMessage = $this->levels[$type].': '.$message; if (null !== self::$toStringException) { $errorAsException = self::$toStringException; self::$toStringException = null; } elseif (!$throw && !($type & $level)) { if (!isset(self::$silencedErrorCache[$id = $file.':'.$line])) { $lightTrace = $this->tracedErrors & $type ? $this->cleanTrace(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3), $type, $file, $line, false) : array(); $errorAsException = new SilencedErrorContext($type, $file, $line, $lightTrace); } elseif (isset(self::$silencedErrorCache[$id][$message])) { $lightTrace = null; $errorAsException = self::$silencedErrorCache[$id][$message]; ++$errorAsException->count; } else { $lightTrace = array(); $errorAsException = null; } if (100 < ++self::$silencedErrorCount) { self::$silencedErrorCache = $lightTrace = array(); self::$silencedErrorCount = 1; } if ($errorAsException) { self::$silencedErrorCache[$id][$message] = $errorAsException; } if (null === $lightTrace) { return; } } else { if ($scope) { $errorAsException = new ContextErrorException($logMessage, 0, $type, $file, $line, $context); } else { $errorAsException = new \ErrorException($logMessage, 0, $type, $file, $line); } // Clean the trace by removing function arguments and the first frames added by the error handler itself. if ($throw || $this->tracedErrors & $type) { $backtrace = $backtrace ?: $errorAsException->getTrace(); $lightTrace = $this->cleanTrace($backtrace, $type, $file, $line, $throw); $this->traceReflector->setValue($errorAsException, $lightTrace); } else { $this->traceReflector->setValue($errorAsException, array()); } } if ($throw) { if (E_USER_ERROR & $type) { for ($i = 1; isset($backtrace[$i]); ++$i) { if (isset($backtrace[$i]['function'], $backtrace[$i]['type'], $backtrace[$i - 1]['function']) && '__toString' === $backtrace[$i]['function'] && '->' === $backtrace[$i]['type'] && !isset($backtrace[$i - 1]['class']) && ('trigger_error' === $backtrace[$i - 1]['function'] || 'user_error' === $backtrace[$i - 1]['function']) ) { // Here, we know trigger_error() has been called from __toString(). // HHVM is fine with throwing from __toString() but PHP triggers a fatal error instead. // A small convention allows working around the limitation: // given a caught $e exception in __toString(), quitting the method with // `return trigger_error($e, E_USER_ERROR);` allows this error handler // to make $e get through the __toString() barrier. foreach ($context as $e) { if (($e instanceof \Exception || $e instanceof \Throwable) && $e->__toString() === $message) { if (1 === $i) { // On HHVM $errorAsException = $e; break; } self::$toStringException = $e; return true; } } if (1 < $i) { // On PHP (not on HHVM), display the original error message instead of the default one. $this->handleException($errorAsException); // Stop the process by giving back the error to the native handler. return false; } } } } throw $errorAsException; } if ($this->isRecursive) { $log = 0; } elseif (self::$stackedErrorLevels) { self::$stackedErrors[] = array( $this->loggers[$type][0], ($type & $level) ? $this->loggers[$type][1] : LogLevel::DEBUG, $logMessage, $errorAsException ? array('exception' => $errorAsException) : array(), ); } else { try { $this->isRecursive = true; $level = ($type & $level) ? $this->loggers[$type][1] : LogLevel::DEBUG; $this->loggers[$type][0]->log($level, $logMessage, $errorAsException ? array('exception' => $errorAsException) : array()); } finally { $this->isRecursive = false; } } return $type && $log; } /** * Handles an exception by logging then forwarding it to another handler. * * @param \Exception|\Throwable $exception An exception to handle * @param array $error An array as returned by error_get_last() * * @internal */ public function handleException($exception, array $error = null) { if (null === $error) { self::$exitCode = 255; } if (!$exception instanceof \Exception) { $exception = new FatalThrowableError($exception); } $type = $exception instanceof FatalErrorException ? $exception->getSeverity() : E_ERROR; $handlerException = null; if (($this->loggedErrors & $type) || $exception instanceof FatalThrowableError) { if ($exception instanceof FatalErrorException) { if ($exception instanceof FatalThrowableError) { $error = array( 'type' => $type, 'message' => $message = $exception->getMessage(), 'file' => $exception->getFile(), 'line' => $exception->getLine(), ); } else { $message = 'Fatal '.$exception->getMessage(); } } elseif ($exception instanceof \ErrorException) { $message = 'Uncaught '.$exception->getMessage(); } else { $message = 'Uncaught Exception: '.$exception->getMessage(); } } if ($this->loggedErrors & $type) { try { $this->loggers[$type][0]->log($this->loggers[$type][1], $message, array('exception' => $exception)); } catch (\Exception $handlerException) { } catch (\Throwable $handlerException) { } } if ($exception instanceof FatalErrorException && !$exception instanceof OutOfMemoryException && $error) { foreach ($this->getFatalErrorHandlers() as $handler) { if ($e = $handler->handleError($error, $exception)) { $exception = $e; break; } } } try { if (null !== $this->exceptionHandler) { return \call_user_func($this->exceptionHandler, $exception); } $handlerException = $handlerException ?: $exception; } catch (\Exception $handlerException) { } catch (\Throwable $handlerException) { } $this->exceptionHandler = null; if ($exception === $handlerException) { self::$reservedMemory = null; // Disable the fatal error handler throw $exception; // Give back $exception to the native handler } $this->handleException($handlerException); } /** * Shutdown registered function for handling PHP fatal errors. * * @param array $error An array as returned by error_get_last() * * @internal */ public static function handleFatalError(array $error = null) { if (null === self::$reservedMemory) { return; } $handler = self::$reservedMemory = null; $handlers = array(); $previousHandler = null; $sameHandlerLimit = 10; while (!is_array($handler) || !$handler[0] instanceof self) { $handler = set_exception_handler('var_dump'); restore_exception_handler(); if (!$handler) { break; } restore_exception_handler(); if ($handler !== $previousHandler) { array_unshift($handlers, $handler); $previousHandler = $handler; } elseif (0 === --$sameHandlerLimit) { $handler = null; break; } } foreach ($handlers as $h) { set_exception_handler($h); } if (!$handler) { return; } if ($handler !== $h) { $handler[0]->setExceptionHandler($h); } $handler = $handler[0]; $handlers = array(); if ($exit = null === $error) { $error = error_get_last(); } try { while (self::$stackedErrorLevels) { static::unstackErrors(); } } catch (\Exception $exception) { // Handled below } catch (\Throwable $exception) { // Handled below } if ($error && $error['type'] &= E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR) { // Let's not throw anymore but keep logging $handler->throwAt(0, true); $trace = isset($error['backtrace']) ? $error['backtrace'] : null; if (0 === strpos($error['message'], 'Allowed memory') || 0 === strpos($error['message'], 'Out of memory')) { $exception = new OutOfMemoryException($handler->levels[$error['type']].': '.$error['message'], 0, $error['type'], $error['file'], $error['line'], 2, false, $trace); } else { $exception = new FatalErrorException($handler->levels[$error['type']].': '.$error['message'], 0, $error['type'], $error['file'], $error['line'], 2, true, $trace); } } try { if (isset($exception)) { self::$exitCode = 255; $handler->handleException($exception, $error); } } catch (FatalErrorException $e) { // Ignore this re-throw } if ($exit && self::$exitCode) { $exitCode = self::$exitCode; register_shutdown_function('register_shutdown_function', function () use ($exitCode) { exit($exitCode); }); } } /** * Configures the error handler for delayed handling. * Ensures also that non-catchable fatal errors are never silenced. * * As shown by http://bugs.php.net/42098 and http://bugs.php.net/60724 * PHP has a compile stage where it behaves unusually. To workaround it, * we plug an error handler that only stacks errors for later. * * The most important feature of this is to prevent * autoloading until unstackErrors() is called. * * @deprecated since version 3.4, to be removed in 4.0. */ public static function stackErrors() { @trigger_error('Support for stacking errors is deprecated since Symfony 3.4 and will be removed in 4.0.', E_USER_DEPRECATED); self::$stackedErrorLevels[] = error_reporting(error_reporting() | E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR); } /** * Unstacks stacked errors and forwards to the logger. * * @deprecated since version 3.4, to be removed in 4.0. */ public static function unstackErrors() { @trigger_error('Support for unstacking errors is deprecated since Symfony 3.4 and will be removed in 4.0.', E_USER_DEPRECATED); $level = array_pop(self::$stackedErrorLevels); if (null !== $level) { $errorReportingLevel = error_reporting($level); if ($errorReportingLevel !== ($level | E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR)) { // If the user changed the error level, do not overwrite it error_reporting($errorReportingLevel); } } if (empty(self::$stackedErrorLevels)) { $errors = self::$stackedErrors; self::$stackedErrors = array(); foreach ($errors as $error) { $error[0]->log($error[1], $error[2], $error[3]); } } } /** * Gets the fatal error handlers. * * Override this method if you want to define more fatal error handlers. * * @return FatalErrorHandlerInterface[] An array of FatalErrorHandlerInterface */ protected function getFatalErrorHandlers() { return array( new UndefinedFunctionFatalErrorHandler(), new UndefinedMethodFatalErrorHandler(), new ClassNotFoundFatalErrorHandler(), ); } private function cleanTrace($backtrace, $type, $file, $line, $throw) { $lightTrace = $backtrace; for ($i = 0; isset($backtrace[$i]); ++$i) { if (isset($backtrace[$i]['file'], $backtrace[$i]['line']) && $backtrace[$i]['line'] === $line && $backtrace[$i]['file'] === $file) { $lightTrace = array_slice($lightTrace, 1 + $i); break; } } if (!($throw || $this->scopedErrors & $type)) { for ($i = 0; isset($lightTrace[$i]); ++$i) { unset($lightTrace[$i]['args'], $lightTrace[$i]['object']); } } return $lightTrace; } }