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<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\base;
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use Yii;
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use yii\web\HttpException;
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/**
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* ErrorHandler handles uncaught PHP errors and exceptions.
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*
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* ErrorHandler is configured as an application component in [[\yii\base\Application]] by default.
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* You can access that instance via `Yii::$app->errorHandler`.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @author Alexander Makarov <sam@rmcreative.ru>
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* @author Carsten Brandt <mail@cebe.cc>
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* @since 2.0
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*/
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abstract class ErrorHandler extends Component
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{
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/**
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* @var boolean whether to discard any existing page output before error display. Defaults to true.
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*/
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public $discardExistingOutput = true;
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/**
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* @var integer the size of the reserved memory. A portion of memory is pre-allocated so that
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* when an out-of-memory issue occurs, the error handler is able to handle the error with
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* the help of this reserved memory. If you set this value to be 0, no memory will be reserved.
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* Defaults to 256KB.
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*/
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public $memoryReserveSize = 262144;
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/**
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* @var \Exception the exception that is being handled currently.
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*/
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public $exception;
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/**
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* @var string Used to reserve memory for fatal error handler.
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*/
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private $_memoryReserve;
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/**
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* Register this errorhandler
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*/
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public function register()
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{
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ini_set('display_errors', false);
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set_exception_handler([$this, 'handleException']);
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set_error_handler([$this, 'handleError']);
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if ($this->memoryReserveSize > 0) {
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$this->_memoryReserve = str_repeat('x', $this->memoryReserveSize);
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}
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register_shutdown_function([$this, 'handleFatalError']);
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}
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/**
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* Handles uncaught PHP exceptions.
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*
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* This method is implemented as a PHP exception handler.
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*
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* @param \Exception $exception the exception that is not caught
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*/
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public function handleException($exception)
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{
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if ($exception instanceof ExitException) {
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return;
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}
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$this->exception = $exception;
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// disable error capturing to avoid recursive errors while handling exceptions
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restore_error_handler();
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restore_exception_handler();
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try {
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$this->logException($exception);
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if ($this->discardExistingOutput) {
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$this->clearOutput();
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}
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$this->renderException($exception);
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if (!YII_ENV_TEST) {
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exit(1);
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}
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} catch (\Exception $e) {
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// an other exception could be thrown while displaying the exception
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$msg = (string) $e;
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$msg .= "\nPrevious exception:\n";
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$msg .= (string) $exception;
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if (YII_DEBUG) {
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if (PHP_SAPI === 'cli') {
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echo $msg . "\n";
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} else {
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echo '<pre>' . htmlspecialchars($msg, ENT_QUOTES, Yii::$app->charset) . '</pre>';
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}
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}
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$msg .= "\n\$_SERVER = " . var_export($_SERVER, true);
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error_log($msg);
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exit(1);
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}
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$this->exception = null;
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}
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/**
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* Handles PHP execution errors such as warnings and notices.
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*
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* This method is used as a PHP error handler. It will simply raise an [[ErrorException]].
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*
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* @param integer $code the level of the error raised.
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* @param string $message the error message.
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* @param string $file the filename that the error was raised in.
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* @param integer $line the line number the error was raised at.
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*
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* @throws ErrorException
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*/
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public function handleError($code, $message, $file, $line)
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{
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if (error_reporting() & $code) {
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// load ErrorException manually here because autoloading them will not work
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// when error occurs while autoloading a class
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if (!class_exists('yii\\base\\ErrorException', false)) {
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require_once(__DIR__ . '/ErrorException.php');
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}
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$exception = new ErrorException($message, $code, $code, $file, $line);
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// in case error appeared in __toString method we can't throw any exception
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$trace = debug_backtrace(0);
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array_shift($trace);
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foreach ($trace as $frame) {
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if ($frame['function'] == '__toString') {
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$this->handleException($exception);
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exit(1);
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}
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}
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throw $exception;
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}
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}
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/**
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* Handles fatal PHP errors
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*/
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public function handleFatalError()
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{
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unset($this->_memoryReserve);
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// load ErrorException manually here because autoloading them will not work
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// when error occurs while autoloading a class
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if (!class_exists('yii\\base\\ErrorException', false)) {
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require_once(__DIR__ . '/ErrorException.php');
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}
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$error = error_get_last();
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if (ErrorException::isFatalError($error)) {
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$exception = new ErrorException($error['message'], $error['type'], $error['type'], $error['file'], $error['line']);
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$this->exception = $exception;
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// use error_log because it's too late to use Yii log
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// also do not log when on CLI SAPI because message will be sent to STDERR which has already been done by PHP
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PHP_SAPI === 'cli' or error_log($exception);
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if ($this->discardExistingOutput) {
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$this->clearOutput();
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}
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$this->renderException($exception);
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exit(1);
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}
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}
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/**
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* Renders the exception.
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* @param \Exception $exception the exception to be rendered.
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*/
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abstract protected function renderException($exception);
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/**
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* Logs the given exception
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* @param \Exception $exception the exception to be logged
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*/
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protected function logException($exception)
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{
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$category = get_class($exception);
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if ($exception instanceof HttpException) {
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$category = 'yii\\web\\HttpException:' . $exception->statusCode;
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} elseif ($exception instanceof \ErrorException) {
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$category .= ':' . $exception->getSeverity();
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}
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Yii::error((string) $exception, $category);
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}
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/**
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* Removes all output echoed before calling this method.
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*/
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public function clearOutput()
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{
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// the following manual level counting is to deal with zlib.output_compression set to On
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for ($level = ob_get_level(); $level > 0; --$level) {
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if (!@ob_end_clean()) {
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ob_clean();
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}
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}
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}
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/**
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* Converts an exception into a PHP error.
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*
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* This method can be used to convert exceptions inside of methods like `__toString()`
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* to PHP errors because exceptions cannot be thrown inside of them.
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* @param \Exception $exception the exception to convert to a PHP error.
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*/
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public static function convertExceptionToError($exception)
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{
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trigger_error(static::convertExceptionToString($exception), E_USER_ERROR);
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}
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/**
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* Converts an exception into a simple string.
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* @param \Exception $exception the exception being converted
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* @return string the string representation of the exception.
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*/
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public static function convertExceptionToString($exception)
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{
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if ($exception instanceof Exception && ($exception instanceof UserException || !YII_DEBUG)) {
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$message = "{$exception->getName()}: {$exception->getMessage()}";
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} elseif (YII_DEBUG) {
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if ($exception instanceof Exception) {
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$message = "Exception ({$exception->getName()})";
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} elseif ($exception instanceof ErrorException) {
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$message = "{$exception->getName()}";
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} else {
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$message = 'Exception';
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}
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$message .= " '" . get_class($exception) . "' with message '{$exception->getMessage()}' \n\nin "
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. $exception->getFile() . ':' . $exception->getLine() . "\n\n"
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. "Stack trace:\n" . $exception->getTraceAsString();
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} else {
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$message = 'Error: ' . $exception->getMessage();
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}
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return $message;
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}
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}
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