665 lines
24 KiB
PHP
665 lines
24 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Debug;
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use Psr\Log\LogLevel;
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use Psr\Log\LoggerInterface;
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use Symfony\Component\Debug\Exception\ContextErrorException;
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use Symfony\Component\Debug\Exception\FatalErrorException;
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use Symfony\Component\Debug\Exception\FatalThrowableError;
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use Symfony\Component\Debug\Exception\OutOfMemoryException;
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use Symfony\Component\Debug\FatalErrorHandler\UndefinedFunctionFatalErrorHandler;
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use Symfony\Component\Debug\FatalErrorHandler\UndefinedMethodFatalErrorHandler;
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use Symfony\Component\Debug\FatalErrorHandler\ClassNotFoundFatalErrorHandler;
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use Symfony\Component\Debug\FatalErrorHandler\FatalErrorHandlerInterface;
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/**
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* A generic ErrorHandler for the PHP engine.
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*
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* Provides five bit fields that control how errors are handled:
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* - thrownErrors: errors thrown as \ErrorException
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* - loggedErrors: logged errors, when not @-silenced
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* - scopedErrors: errors thrown or logged with their local context
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* - tracedErrors: errors logged with their stack trace, only once for repeated errors
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* - screamedErrors: never @-silenced errors
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*
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* Each error level can be logged by a dedicated PSR-3 logger object.
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* Screaming only applies to logging.
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* Throwing takes precedence over logging.
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* Uncaught exceptions are logged as E_ERROR.
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* E_DEPRECATED and E_USER_DEPRECATED levels never throw.
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* E_RECOVERABLE_ERROR and E_USER_ERROR levels always throw.
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* Non catchable errors that can be detected at shutdown time are logged when the scream bit field allows so.
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* As errors have a performance cost, repeated errors are all logged, so that the developer
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* can see them and weight them as more important to fix than others of the same level.
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*
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* @author Nicolas Grekas <p@tchwork.com>
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*/
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class ErrorHandler
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{
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private $levels = array(
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E_DEPRECATED => 'Deprecated',
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E_USER_DEPRECATED => 'User Deprecated',
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E_NOTICE => 'Notice',
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E_USER_NOTICE => 'User Notice',
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E_STRICT => 'Runtime Notice',
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E_WARNING => 'Warning',
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E_USER_WARNING => 'User Warning',
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E_COMPILE_WARNING => 'Compile Warning',
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E_CORE_WARNING => 'Core Warning',
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E_USER_ERROR => 'User Error',
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E_RECOVERABLE_ERROR => 'Catchable Fatal Error',
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E_COMPILE_ERROR => 'Compile Error',
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E_PARSE => 'Parse Error',
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E_ERROR => 'Error',
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E_CORE_ERROR => 'Core Error',
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);
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private $loggers = array(
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E_DEPRECATED => array(null, LogLevel::INFO),
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E_USER_DEPRECATED => array(null, LogLevel::INFO),
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E_NOTICE => array(null, LogLevel::WARNING),
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E_USER_NOTICE => array(null, LogLevel::WARNING),
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E_STRICT => array(null, LogLevel::WARNING),
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E_WARNING => array(null, LogLevel::WARNING),
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E_USER_WARNING => array(null, LogLevel::WARNING),
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E_COMPILE_WARNING => array(null, LogLevel::WARNING),
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E_CORE_WARNING => array(null, LogLevel::WARNING),
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E_USER_ERROR => array(null, LogLevel::CRITICAL),
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E_RECOVERABLE_ERROR => array(null, LogLevel::CRITICAL),
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E_COMPILE_ERROR => array(null, LogLevel::CRITICAL),
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E_PARSE => array(null, LogLevel::CRITICAL),
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E_ERROR => array(null, LogLevel::CRITICAL),
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E_CORE_ERROR => array(null, LogLevel::CRITICAL),
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);
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private $thrownErrors = 0x1FFF; // E_ALL - E_DEPRECATED - E_USER_DEPRECATED
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private $scopedErrors = 0x1FFF; // E_ALL - E_DEPRECATED - E_USER_DEPRECATED
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private $tracedErrors = 0x77FB; // E_ALL - E_STRICT - E_PARSE
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private $screamedErrors = 0x55; // E_ERROR + E_CORE_ERROR + E_COMPILE_ERROR + E_PARSE
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private $loggedErrors = 0;
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private $loggedTraces = array();
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private $isRecursive = 0;
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private $isRoot = false;
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private $exceptionHandler;
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private $bootstrappingLogger;
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private static $reservedMemory;
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private static $stackedErrors = array();
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private static $stackedErrorLevels = array();
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private static $toStringException = null;
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/**
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* Registers the error handler.
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*
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* @param self|null $handler The handler to register
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* @param bool $replace Whether to replace or not any existing handler
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*
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* @return self The registered error handler
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*/
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public static function register(self $handler = null, $replace = true)
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{
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if (null === self::$reservedMemory) {
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self::$reservedMemory = str_repeat('x', 10240);
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register_shutdown_function(__CLASS__.'::handleFatalError');
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}
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if ($handlerIsNew = null === $handler) {
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$handler = new static();
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}
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if (null === $prev = set_error_handler(array($handler, 'handleError'))) {
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restore_error_handler();
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// Specifying the error types earlier would expose us to https://bugs.php.net/63206
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set_error_handler(array($handler, 'handleError'), $handler->thrownErrors | $handler->loggedErrors);
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$handler->isRoot = true;
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}
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if ($handlerIsNew && is_array($prev) && $prev[0] instanceof self) {
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$handler = $prev[0];
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$replace = false;
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}
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if ($replace || !$prev) {
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$handler->setExceptionHandler(set_exception_handler(array($handler, 'handleException')));
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} else {
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restore_error_handler();
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}
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$handler->throwAt(E_ALL & $handler->thrownErrors, true);
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return $handler;
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}
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public function __construct(BufferingLogger $bootstrappingLogger = null)
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{
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if ($bootstrappingLogger) {
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$this->bootstrappingLogger = $bootstrappingLogger;
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$this->setDefaultLogger($bootstrappingLogger);
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}
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}
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/**
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* Sets a logger to non assigned errors levels.
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*
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* @param LoggerInterface $logger A PSR-3 logger to put as default for the given levels
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* @param array|int $levels An array map of E_* to LogLevel::* or an integer bit field of E_* constants
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* @param bool $replace Whether to replace or not any existing logger
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*/
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public function setDefaultLogger(LoggerInterface $logger, $levels = E_ALL, $replace = false)
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{
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$loggers = array();
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if (is_array($levels)) {
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foreach ($levels as $type => $logLevel) {
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if (empty($this->loggers[$type][0]) || $replace || $this->loggers[$type][0] === $this->bootstrappingLogger) {
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$loggers[$type] = array($logger, $logLevel);
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}
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}
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} else {
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if (null === $levels) {
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$levels = E_ALL;
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}
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foreach ($this->loggers as $type => $log) {
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if (($type & $levels) && (empty($log[0]) || $replace || $log[0] === $this->bootstrappingLogger)) {
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$log[0] = $logger;
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$loggers[$type] = $log;
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}
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}
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}
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$this->setLoggers($loggers);
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}
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/**
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* Sets a logger for each error level.
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*
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* @param array $loggers Error levels to [LoggerInterface|null, LogLevel::*] map
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*
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* @return array The previous map
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*
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* @throws \InvalidArgumentException
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*/
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public function setLoggers(array $loggers)
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{
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$prevLogged = $this->loggedErrors;
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$prev = $this->loggers;
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$flush = array();
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foreach ($loggers as $type => $log) {
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if (!isset($prev[$type])) {
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throw new \InvalidArgumentException('Unknown error type: '.$type);
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}
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if (!is_array($log)) {
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$log = array($log);
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} elseif (!array_key_exists(0, $log)) {
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throw new \InvalidArgumentException('No logger provided');
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}
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if (null === $log[0]) {
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$this->loggedErrors &= ~$type;
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} elseif ($log[0] instanceof LoggerInterface) {
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$this->loggedErrors |= $type;
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} else {
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throw new \InvalidArgumentException('Invalid logger provided');
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}
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$this->loggers[$type] = $log + $prev[$type];
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if ($this->bootstrappingLogger && $prev[$type][0] === $this->bootstrappingLogger) {
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$flush[$type] = $type;
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}
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}
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$this->reRegister($prevLogged | $this->thrownErrors);
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if ($flush) {
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foreach ($this->bootstrappingLogger->cleanLogs() as $log) {
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$type = $log[2]['type'];
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if (!isset($flush[$type])) {
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$this->bootstrappingLogger->log($log[0], $log[1], $log[2]);
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} elseif ($this->loggers[$type][0]) {
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$this->loggers[$type][0]->log($this->loggers[$type][1], $log[1], $log[2]);
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}
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}
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}
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return $prev;
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}
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/**
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* Sets a user exception handler.
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*
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* @param callable $handler A handler that will be called on Exception
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*
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* @return callable|null The previous exception handler
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*/
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public function setExceptionHandler(callable $handler = null)
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{
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$prev = $this->exceptionHandler;
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$this->exceptionHandler = $handler;
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return $prev;
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}
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/**
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* Sets the PHP error levels that throw an exception when a PHP error occurs.
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*
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* @param int $levels A bit field of E_* constants for thrown errors
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* @param bool $replace Replace or amend the previous value
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*
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* @return int The previous value
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*/
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public function throwAt($levels, $replace = false)
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{
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$prev = $this->thrownErrors;
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$this->thrownErrors = ($levels | E_RECOVERABLE_ERROR | E_USER_ERROR) & ~E_USER_DEPRECATED & ~E_DEPRECATED;
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if (!$replace) {
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$this->thrownErrors |= $prev;
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}
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$this->reRegister($prev | $this->loggedErrors);
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return $prev;
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}
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/**
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* Sets the PHP error levels for which local variables are preserved.
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*
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* @param int $levels A bit field of E_* constants for scoped errors
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* @param bool $replace Replace or amend the previous value
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*
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* @return int The previous value
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*/
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public function scopeAt($levels, $replace = false)
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{
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$prev = $this->scopedErrors;
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$this->scopedErrors = (int) $levels;
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if (!$replace) {
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$this->scopedErrors |= $prev;
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}
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return $prev;
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}
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/**
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* Sets the PHP error levels for which the stack trace is preserved.
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*
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* @param int $levels A bit field of E_* constants for traced errors
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* @param bool $replace Replace or amend the previous value
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*
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* @return int The previous value
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*/
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public function traceAt($levels, $replace = false)
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{
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$prev = $this->tracedErrors;
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$this->tracedErrors = (int) $levels;
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if (!$replace) {
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$this->tracedErrors |= $prev;
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}
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return $prev;
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}
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/**
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* Sets the error levels where the @-operator is ignored.
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*
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* @param int $levels A bit field of E_* constants for screamed errors
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* @param bool $replace Replace or amend the previous value
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*
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* @return int The previous value
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*/
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public function screamAt($levels, $replace = false)
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{
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$prev = $this->screamedErrors;
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$this->screamedErrors = (int) $levels;
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if (!$replace) {
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$this->screamedErrors |= $prev;
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}
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return $prev;
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}
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/**
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* Re-registers as a PHP error handler if levels changed.
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*/
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private function reRegister($prev)
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{
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if ($prev !== $this->thrownErrors | $this->loggedErrors) {
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$handler = set_error_handler('var_dump');
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$handler = is_array($handler) ? $handler[0] : null;
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restore_error_handler();
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if ($handler === $this) {
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restore_error_handler();
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if ($this->isRoot) {
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set_error_handler(array($this, 'handleError'), $this->thrownErrors | $this->loggedErrors);
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} else {
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set_error_handler(array($this, 'handleError'));
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}
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}
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}
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}
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/**
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* Handles errors by filtering then logging them according to the configured bit fields.
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*
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* @param int $type One of the E_* constants
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* @param string $file
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* @param int $line
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* @param array $context
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*
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* @return bool Returns false when no handling happens so that the PHP engine can handle the error itself.
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*
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* @throws \ErrorException When $this->thrownErrors requests so
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*
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* @internal
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*/
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public function handleError($type, $message, $file, $line, array $context, array $backtrace = null)
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{
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$level = error_reporting() | E_RECOVERABLE_ERROR | E_USER_ERROR | E_DEPRECATED | E_USER_DEPRECATED;
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$log = $this->loggedErrors & $type;
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$throw = $this->thrownErrors & $type & $level;
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$type &= $level | $this->screamedErrors;
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if (!$type || (!$log && !$throw)) {
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return $type && $log;
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}
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if (null !== $backtrace && $type & E_ERROR) {
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// E_ERROR fatal errors are triggered on HHVM when
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// hhvm.error_handling.call_user_handler_on_fatals=1
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// which is the way to get their backtrace.
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$this->handleFatalError(compact('type', 'message', 'file', 'line', 'backtrace'));
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return true;
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}
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if ($throw) {
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if (null !== self::$toStringException) {
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$throw = self::$toStringException;
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self::$toStringException = null;
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} elseif (($this->scopedErrors & $type) && class_exists(ContextErrorException::class)) {
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$throw = new ContextErrorException($this->levels[$type].': '.$message, 0, $type, $file, $line, $context);
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} else {
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$throw = new \ErrorException($this->levels[$type].': '.$message, 0, $type, $file, $line);
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}
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if (E_USER_ERROR & $type) {
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$backtrace = $backtrace ?: $throw->getTrace();
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for ($i = 1; isset($backtrace[$i]); ++$i) {
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if (isset($backtrace[$i]['function'], $backtrace[$i]['type'], $backtrace[$i - 1]['function'])
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&& '__toString' === $backtrace[$i]['function']
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&& '->' === $backtrace[$i]['type']
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&& !isset($backtrace[$i - 1]['class'])
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&& ('trigger_error' === $backtrace[$i - 1]['function'] || 'user_error' === $backtrace[$i - 1]['function'])
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) {
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// Here, we know trigger_error() has been called from __toString().
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// HHVM is fine with throwing from __toString() but PHP triggers a fatal error instead.
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// A small convention allows working around the limitation:
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// given a caught $e exception in __toString(), quitting the method with
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// `return trigger_error($e, E_USER_ERROR);` allows this error handler
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// to make $e get through the __toString() barrier.
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foreach ($context as $e) {
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if (($e instanceof \Exception || $e instanceof \Throwable) && $e->__toString() === $message) {
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if (1 === $i) {
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// On HHVM
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$throw = $e;
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break;
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}
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self::$toStringException = $e;
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return true;
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}
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}
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if (1 < $i) {
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// On PHP (not on HHVM), display the original error message instead of the default one.
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$this->handleException($throw);
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// Stop the process by giving back the error to the native handler.
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return false;
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}
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}
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}
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}
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throw $throw;
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}
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// For duplicated errors, log the trace only once
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$e = md5("{$type}/{$line}/{$file}\x00{$message}", true);
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$trace = true;
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if (!($this->tracedErrors & $type) || isset($this->loggedTraces[$e])) {
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$trace = false;
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} else {
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$this->loggedTraces[$e] = 1;
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}
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$e = compact('type', 'file', 'line', 'level');
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if ($type & $level) {
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if ($this->scopedErrors & $type) {
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$e['scope_vars'] = $context;
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if ($trace) {
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$e['stack'] = $backtrace ?: debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT);
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}
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} elseif ($trace) {
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if (null === $backtrace) {
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$e['stack'] = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
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} else {
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foreach ($backtrace as &$frame) {
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unset($frame['args'], $frame);
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}
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$e['stack'] = $backtrace;
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}
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}
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}
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if ($this->isRecursive) {
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$log = 0;
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} elseif (self::$stackedErrorLevels) {
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self::$stackedErrors[] = array($this->loggers[$type][0], ($type & $level) ? $this->loggers[$type][1] : LogLevel::DEBUG, $message, $e);
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} else {
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try {
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$this->isRecursive = true;
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$this->loggers[$type][0]->log(($type & $level) ? $this->loggers[$type][1] : LogLevel::DEBUG, $message, $e);
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} finally {
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$this->isRecursive = false;
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}
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}
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return $type && $log;
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}
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/**
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* Handles an exception by logging then forwarding it to another handler.
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*
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* @param \Exception|\Throwable $exception An exception to handle
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* @param array $error An array as returned by error_get_last()
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*
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* @internal
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*/
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public function handleException($exception, array $error = null)
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{
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if (!$exception instanceof \Exception) {
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$exception = new FatalThrowableError($exception);
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}
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$type = $exception instanceof FatalErrorException ? $exception->getSeverity() : E_ERROR;
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if (($this->loggedErrors & $type) || $exception instanceof FatalThrowableError) {
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$e = array(
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'type' => $type,
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'file' => $exception->getFile(),
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'line' => $exception->getLine(),
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'level' => error_reporting(),
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'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(),
|
|
);
|
|
}
|
|
}
|