1 | <?php |
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2 | /** |
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3 | * @link http://www.yiiframework.com/ |
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4 | * @copyright Copyright (c) 2008 Yii Software LLC |
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5 | * @license http://www.yiiframework.com/license/ |
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6 | */ |
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7 | |||
8 | namespace yii\base; |
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9 | |||
10 | use Yii; |
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11 | use yii\helpers\VarDumper; |
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12 | use yii\web\HttpException; |
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13 | |||
14 | /** |
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15 | * ErrorHandler handles uncaught PHP errors and exceptions. |
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16 | * |
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17 | * ErrorHandler is configured as an application component in [[\yii\base\Application]] by default. |
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18 | * You can access that instance via `Yii::$app->errorHandler`. |
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19 | * |
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20 | * For more details and usage information on ErrorHandler, see the [guide article on handling errors](guide:runtime-handling-errors). |
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21 | * |
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22 | * @author Qiang Xue <[email protected]> |
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23 | * @author Alexander Makarov <[email protected]> |
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24 | * @author Carsten Brandt <[email protected]> |
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25 | * @since 2.0 |
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26 | */ |
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27 | abstract class ErrorHandler extends Component |
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28 | { |
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29 | /** |
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30 | * @var bool whether to discard any existing page output before error display. Defaults to true. |
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31 | */ |
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32 | public $discardExistingOutput = true; |
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33 | /** |
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34 | * @var int the size of the reserved memory. A portion of memory is pre-allocated so that |
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35 | * when an out-of-memory issue occurs, the error handler is able to handle the error with |
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36 | * the help of this reserved memory. If you set this value to be 0, no memory will be reserved. |
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37 | * Defaults to 256KB. |
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38 | */ |
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39 | public $memoryReserveSize = 262144; |
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40 | /** |
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41 | * @var \Exception|null the exception that is being handled currently. |
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42 | */ |
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43 | public $exception; |
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44 | |||
45 | /** |
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46 | * @var string Used to reserve memory for fatal error handler. |
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47 | */ |
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48 | private $_memoryReserve; |
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49 | /** |
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50 | * @var \Exception from HHVM error that stores backtrace |
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51 | */ |
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52 | private $_hhvmException; |
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53 | |||
54 | |||
55 | /** |
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56 | * Register this error handler. |
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57 | */ |
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58 | public function register() |
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59 | { |
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60 | ini_set('display_errors', false); |
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61 | set_exception_handler([$this, 'handleException']); |
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62 | if (defined('HHVM_VERSION')) { |
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63 | set_error_handler([$this, 'handleHhvmError']); |
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64 | } else { |
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65 | set_error_handler([$this, 'handleError']); |
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66 | } |
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67 | if ($this->memoryReserveSize > 0) { |
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68 | $this->_memoryReserve = str_repeat('x', $this->memoryReserveSize); |
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69 | } |
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70 | register_shutdown_function([$this, 'handleFatalError']); |
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71 | } |
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72 | |||
73 | /** |
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74 | * Unregisters this error handler by restoring the PHP error and exception handlers. |
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75 | */ |
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76 | public function unregister() |
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77 | { |
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78 | restore_error_handler(); |
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79 | restore_exception_handler(); |
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80 | } |
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81 | |||
82 | /** |
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83 | * Handles uncaught PHP exceptions. |
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84 | * |
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85 | * This method is implemented as a PHP exception handler. |
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86 | * |
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87 | * @param \Exception $exception the exception that is not caught |
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88 | */ |
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89 | public function handleException($exception) |
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90 | { |
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91 | if ($exception instanceof ExitException) { |
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92 | return; |
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93 | } |
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94 | |||
95 | $this->exception = $exception; |
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96 | |||
97 | // disable error capturing to avoid recursive errors while handling exceptions |
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98 | $this->unregister(); |
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99 | |||
100 | // set preventive HTTP status code to 500 in case error handling somehow fails and headers are sent |
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101 | // HTTP exceptions will override this value in renderException() |
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102 | if (PHP_SAPI !== 'cli') { |
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103 | http_response_code(500); |
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104 | } |
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105 | |||
106 | try { |
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107 | $this->logException($exception); |
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108 | if ($this->discardExistingOutput) { |
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109 | $this->clearOutput(); |
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110 | } |
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111 | $this->renderException($exception); |
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112 | if (!YII_ENV_TEST) { |
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113 | \Yii::getLogger()->flush(true); |
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114 | if (defined('HHVM_VERSION')) { |
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115 | flush(); |
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116 | } |
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117 | exit(1); |
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118 | } |
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119 | } catch (\Exception $e) { |
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120 | // an other exception could be thrown while displaying the exception |
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121 | $this->handleFallbackExceptionMessage($e, $exception); |
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122 | } catch (\Throwable $e) { |
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123 | // additional check for \Throwable introduced in PHP 7 |
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124 | $this->handleFallbackExceptionMessage($e, $exception); |
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125 | } |
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126 | |||
127 | $this->exception = null; |
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128 | } |
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129 | |||
130 | /** |
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131 | * Handles exception thrown during exception processing in [[handleException()]]. |
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132 | * @param \Exception|\Throwable $exception Exception that was thrown during main exception processing. |
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133 | * @param \Exception $previousException Main exception processed in [[handleException()]]. |
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134 | * @since 2.0.11 |
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135 | */ |
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136 | protected function handleFallbackExceptionMessage($exception, $previousException) |
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137 | { |
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138 | $msg = "An Error occurred while handling another error:\n"; |
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139 | $msg .= (string) $exception; |
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140 | $msg .= "\nPrevious exception:\n"; |
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141 | $msg .= (string) $previousException; |
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142 | if (YII_DEBUG) { |
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143 | if (PHP_SAPI === 'cli') { |
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144 | echo $msg . "\n"; |
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145 | } else { |
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146 | echo '<pre>' . htmlspecialchars($msg, ENT_QUOTES, Yii::$app->charset) . '</pre>'; |
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147 | } |
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148 | } else { |
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149 | echo 'An internal server error occurred.'; |
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150 | } |
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151 | $msg .= "\n\$_SERVER = " . VarDumper::export($_SERVER); |
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152 | error_log($msg); |
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153 | if (defined('HHVM_VERSION')) { |
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154 | flush(); |
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155 | } |
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156 | exit(1); |
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157 | } |
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158 | |||
159 | /** |
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160 | * Handles HHVM execution errors such as warnings and notices. |
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161 | * |
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162 | * This method is used as a HHVM error handler. It will store exception that will |
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163 | * be used in fatal error handler |
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164 | * |
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165 | * @param int $code the level of the error raised. |
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166 | * @param string $message the error message. |
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167 | * @param string $file the filename that the error was raised in. |
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168 | * @param int $line the line number the error was raised at. |
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169 | * @param mixed $context |
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170 | * @param mixed $backtrace trace of error |
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171 | * @return bool whether the normal error handler continues. |
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172 | * |
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173 | * @throws ErrorException |
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174 | * @since 2.0.6 |
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175 | */ |
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176 | public function handleHhvmError($code, $message, $file, $line, $context, $backtrace) |
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177 | { |
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178 | if ($this->handleError($code, $message, $file, $line)) { |
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179 | return true; |
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180 | } |
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181 | if (E_ERROR & $code) { |
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182 | $exception = new ErrorException($message, $code, $code, $file, $line); |
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183 | $ref = new \ReflectionProperty('\Exception', 'trace'); |
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184 | $ref->setAccessible(true); |
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185 | $ref->setValue($exception, $backtrace); |
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186 | $this->_hhvmException = $exception; |
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187 | } |
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188 | |||
189 | return false; |
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190 | } |
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191 | |||
192 | /** |
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193 | * Handles PHP execution errors such as warnings and notices. |
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194 | * |
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195 | * This method is used as a PHP error handler. It will simply raise an [[ErrorException]]. |
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196 | * |
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197 | * @param int $code the level of the error raised. |
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198 | * @param string $message the error message. |
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199 | * @param string $file the filename that the error was raised in. |
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200 | * @param int $line the line number the error was raised at. |
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201 | * @return bool whether the normal error handler continues. |
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202 | * |
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203 | * @throws ErrorException |
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204 | */ |
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205 | public function handleError($code, $message, $file, $line) |
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206 | { |
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207 | if (error_reporting() & $code) { |
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208 | // load ErrorException manually here because autoloading them will not work |
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209 | // when error occurs while autoloading a class |
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210 | if (!class_exists('yii\\base\\ErrorException', false)) { |
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211 | require_once __DIR__ . '/ErrorException.php'; |
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212 | } |
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213 | $exception = new ErrorException($message, $code, $code, $file, $line); |
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214 | |||
215 | // in case error appeared in __toString method we can't throw any exception |
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216 | $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS); |
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217 | array_shift($trace); |
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218 | foreach ($trace as $frame) { |
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219 | if ($frame['function'] === '__toString') { |
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220 | $this->handleException($exception); |
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221 | if (defined('HHVM_VERSION')) { |
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222 | flush(); |
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223 | } |
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224 | exit(1); |
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225 | } |
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226 | } |
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227 | |||
228 | throw $exception; |
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229 | } |
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230 | |||
231 | return false; |
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232 | } |
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233 | |||
234 | /** |
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235 | * Handles fatal PHP errors. |
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236 | */ |
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237 | public function handleFatalError() |
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238 | { |
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239 | unset($this->_memoryReserve); |
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240 | |||
241 | // load ErrorException manually here because autoloading them will not work |
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242 | // when error occurs while autoloading a class |
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243 | if (!class_exists('yii\\base\\ErrorException', false)) { |
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244 | require_once __DIR__ . '/ErrorException.php'; |
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245 | } |
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246 | |||
247 | $error = error_get_last(); |
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248 | |||
249 | if (ErrorException::isFatalError($error)) { |
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250 | if (!empty($this->_hhvmException)) { |
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251 | $exception = $this->_hhvmException; |
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252 | } else { |
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253 | $exception = new ErrorException($error['message'], $error['type'], $error['type'], $error['file'], $error['line']); |
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254 | } |
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255 | $this->exception = $exception; |
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256 | |||
257 | $this->logException($exception); |
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258 | |||
259 | if ($this->discardExistingOutput) { |
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260 | $this->clearOutput(); |
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261 | } |
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262 | $this->renderException($exception); |
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263 | |||
264 | // need to explicitly flush logs because exit() next will terminate the app immediately |
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265 | Yii::getLogger()->flush(true); |
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266 | if (defined('HHVM_VERSION')) { |
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267 | flush(); |
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268 | } |
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269 | exit(1); |
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270 | } |
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271 | } |
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272 | |||
273 | /** |
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274 | * Renders the exception. |
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275 | * @param \Exception $exception the exception to be rendered. |
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276 | */ |
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277 | abstract protected function renderException($exception); |
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278 | |||
279 | /** |
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280 | * Logs the given exception. |
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281 | * @param \Exception $exception the exception to be logged |
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282 | * @since 2.0.3 this method is now public. |
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283 | */ |
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284 | public function logException($exception) |
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285 | { |
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286 | $category = get_class($exception); |
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287 | if ($exception instanceof HttpException) { |
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288 | $category = 'yii\\web\\HttpException:' . $exception->statusCode; |
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289 | } elseif ($exception instanceof \ErrorException) { |
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290 | $category .= ':' . $exception->getSeverity(); |
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291 | } |
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292 | Yii::error($exception, $category); |
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293 | } |
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294 | |||
295 | /** |
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296 | * Removes all output echoed before calling this method. |
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297 | */ |
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298 | public function clearOutput() |
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299 | { |
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300 | // the following manual level counting is to deal with zlib.output_compression set to On |
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301 | for ($level = ob_get_level(); $level > 0; --$level) { |
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302 | if (!@ob_end_clean()) { |
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303 | ob_clean(); |
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304 | } |
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305 | } |
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306 | } |
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307 | |||
308 | /** |
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309 | * Converts an exception into a PHP error. |
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310 | * |
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311 | * This method can be used to convert exceptions inside of methods like `__toString()` |
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312 | * to PHP errors because exceptions cannot be thrown inside of them. |
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313 | * @param \Exception $exception the exception to convert to a PHP error. |
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314 | */ |
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315 | public static function convertExceptionToError($exception) |
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316 | { |
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317 | trigger_error(static::convertExceptionToString($exception), E_USER_ERROR); |
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318 | } |
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319 | |||
320 | /** |
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321 | * Converts an exception into a simple string. |
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322 | * @param \Exception|\Error $exception the exception being converted |
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323 | * @return string the string representation of the exception. |
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324 | */ |
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325 | public static function convertExceptionToString($exception) |
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326 | { |
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327 | if ($exception instanceof UserException) { |
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328 | return "{$exception->getName()}: {$exception->getMessage()}"; |
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329 | } |
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330 | |||
331 | if (YII_DEBUG) { |
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332 | return static::convertExceptionToVerboseString($exception); |
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333 | } |
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334 | |||
335 | return 'An internal server error occurred.'; |
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336 | } |
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337 | |||
338 | /** |
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339 | * Converts an exception into a string that has verbose information about the exception and its trace. |
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340 | * @param \Exception|\Error $exception the exception being converted |
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341 | * @return string the string representation of the exception. |
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342 | * |
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343 | * @since 2.0.14 |
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344 | */ |
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345 | public static function convertExceptionToVerboseString($exception) |
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346 | { |
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347 | if ($exception instanceof Exception) { |
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348 | $message = "Exception ({$exception->getName()})"; |
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349 | } elseif ($exception instanceof ErrorException) { |
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350 | $message = (string)$exception->getName(); |
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351 | } else { |
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352 | $message = 'Exception'; |
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353 | } |
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354 | $message .= " '" . get_class($exception) . "' with message '{$exception->getMessage()}' \n\nin " |
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355 | . $exception->getFile() . ':' . $exception->getLine() . "\n\n" |
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356 | . "Stack trace:\n" . $exception->getTraceAsString(); |
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357 | |||
358 | return $message; |
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359 | } |
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360 | } |
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361 |