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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Debug;
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\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, only once for repeated errors
* - 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 <p@tchwork.com>
*/
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 $loggedTraces = array();
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;
/**
* 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) {
$handler->setExceptionHandler(set_exception_handler(array($handler, 'handleException')));
} else {
restore_error_handler();
}
$handler->throwAt(E_ALL & $handler->thrownErrors, true);
return $handler;
}
public function __construct(BufferingLogger $bootstrappingLogger = null)
{
if ($bootstrappingLogger) {
$this->bootstrappingLogger = $bootstrappingLogger;
$this->setDefaultLogger($bootstrappingLogger);
}
}
/**
* 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 = $log[2]['type'];
if (!isset($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 $file
* @param int $line
* @param array $context
*
* @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, array $context, array $backtrace = null)
{
$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;
}
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.
$this->handleFatalError(compact('type', 'message', 'file', 'line', 'backtrace'));
return true;
}
if ($throw) {
if (null !== self::$toStringException) {
$throw = self::$toStringException;
self::$toStringException = null;
} elseif (($this->scopedErrors & $type) && class_exists(ContextErrorException::class)) {
$throw = new ContextErrorException($this->levels[$type].': '.$message, 0, $type, $file, $line, $context);
} else {
$throw = new \ErrorException($this->levels[$type].': '.$message, 0, $type, $file, $line);
}
if (E_USER_ERROR & $type) {
$backtrace = $backtrace ?: $throw->getTrace();
for ($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
$throw = $e;
break;
}
self::$toStringException = $e;
return true;
}
}
if (1 < $i) {
// On PHP (not on HHVM), display the original error message instead of the default one.
$this->handleException($throw);
// Stop the process by giving back the error to the native handler.
return false;
}
}
}
}
throw $throw;
}
// For duplicated errors, log the trace only once
$e = md5("{$type}/{$line}/{$file}\x00{$message}", true);
$trace = true;
if (!($this->tracedErrors & $type) || isset($this->loggedTraces[$e])) {
$trace = false;
} else {
$this->loggedTraces[$e] = 1;
}
$e = compact('type', 'file', 'line', 'level');
if ($type & $level) {
if ($this->scopedErrors & $type) {
$e['scope_vars'] = $context;
if ($trace) {
$e['stack'] = $backtrace ?: debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT);
}
} elseif ($trace) {
if (null === $backtrace) {
$e['stack'] = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
} else {
foreach ($backtrace as &$frame) {
unset($frame['args'], $frame);
}
$e['stack'] = $backtrace;
}
}
}
if ($this->isRecursive) {
$log = 0;
} elseif (self::$stackedErrorLevels) {
self::$stackedErrors[] = array($this->loggers[$type][0], ($type & $level) ? $this->loggers[$type][1] : LogLevel::DEBUG, $message, $e);
} else {
try {
$this->isRecursive = true;
$this->loggers[$type][0]->log(($type & $level) ? $this->loggers[$type][1] : LogLevel::DEBUG, $message, $e);
} 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 $error = null)
{
if (!$exception instanceof \Exception) {
$exception = new FatalThrowableError($exception);
}
$type = $exception instanceof FatalErrorException ? $exception->getSeverity() : E_ERROR;
if (($this->loggedErrors & $type) || $exception instanceof FatalThrowableError) {
$e = array(
'type' => $type,
'file' => $exception->getFile(),
'line' => $exception->getLine(),
'level' => error_reporting(),
'stack' => $exception->getTrace(),
);
if ($exception instanceof FatalErrorException) {
if ($exception instanceof FatalThrowableError) {
$error = array(
'type' => $type,
'message' => $message = $exception->getMessage(),
'file' => $e['file'],
'line' => $e['line'],
);
} else {
$message = 'Fatal '.$exception->getMessage();
}
} elseif ($exception instanceof \ErrorException) {
$message = 'Uncaught '.$exception->getMessage();
if ($exception instanceof ContextErrorException) {
$e['context'] = $exception->getContext();
}
} else {
$message = 'Uncaught Exception: '.$exception->getMessage();
}
}
if ($this->loggedErrors & $type) {
$this->loggers[$type][0]->log($this->loggers[$type][1], $message, $e);
}
if ($exception instanceof FatalErrorException && !$exception instanceof OutOfMemoryException && $error) {
foreach ($this->getFatalErrorHandlers() as $handler) {
if ($e = $handler->handleError($error, $exception)) {
$exception = $e;
break;
}
}
}
if (empty($this->exceptionHandler)) {
throw $exception; // Give back $exception to the native handler
}
try {
call_user_func($this->exceptionHandler, $exception);
} catch (\Exception $handlerException) {
} catch (\Throwable $handlerException) {
}
if (isset($handlerException)) {
$this->exceptionHandler = null;
$this->handleException($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;
}
self::$reservedMemory = null;
$handler = set_error_handler('var_dump');
$handler = is_array($handler) ? $handler[0] : null;
restore_error_handler();
if (!$handler instanceof self) {
return;
}
if (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, $trace);
}
} elseif (!isset($exception)) {
return;
}
try {
$handler->handleException($exception, $error);
} catch (FatalErrorException $e) {
// Ignore this re-throw
}
}
/**
* Configures the error handler for delayed handling.
* Ensures also that non-catchable fatal errors are never silenced.
*
* As shown by http://bugs.php.net/42098 and http://bugs.php.net/60724
* PHP has a compile stage where it behaves unusually. To workaround it,
* we plug an error handler that only stacks errors for later.
*
* The most important feature of this is to prevent
* autoloading until unstackErrors() is called.
*/
public static function stackErrors()
{
self::$stackedErrorLevels[] = error_reporting(error_reporting() | E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR);
}
/**
* Unstacks stacked errors and forwards to the logger.
*/
public static function unstackErrors()
{
$level = array_pop(self::$stackedErrorLevels);
if (null !== $level) {
$e = error_reporting($level);
if ($e !== ($level | E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR)) {
// If the user changed the error level, do not overwrite it
error_reporting($e);
}
}
if (empty(self::$stackedErrorLevels)) {
$errors = self::$stackedErrors;
self::$stackedErrors = array();
foreach ($errors as $e) {
$e[0]->log($e[1], $e[2], $e[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(),
);
}
}
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