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<?php
class ErrorHandler
{
const FATAL_MESSAGE = 'Sorry, we encountered a problem and we cannot complete your request...';
private static $LOG_FILE_MAX_SIZE = 1048576;
protected $errno;
protected $errfile;
protected $errline;
protected $errdesc;
protected $errclass;
protected $fatal;
protected $stacktrace;
protected $exception;
public function handle($errno, $errstr, $errfile, $errline)
{
if ($this->needs_to_be_processed($errno))
{
$this->prepare($errno, $errstr, $errfile, $errline);
$this->process();
$this->display();
$this->log();
if ($this->fatal || Debug::is_strict_mode_enabled())
{
exit;
}
}
return true;
}
private function prepare($errno, $errstr, $errfile, $errline)
{
$this->exception = new Exception($errstr);
$this->errno = $errno;
$this->errfile = $errfile;
$this->errline = $errline;
$this->stacktrace = '';
$this->errdesc = '';
$this->errclass = '';
$this->fatal = false;
}
private function needs_to_be_processed($errno)
{
return error_reporting() != 0 && ($errno & ERROR_REPORTING);
}
private function process()
{
switch ($this->errno)
{
case E_USER_NOTICE:
case E_NOTICE:
$this->errdesc = 'Notice';
$this->errclass = 'notice';
break;
case E_USER_WARNING:
case E_WARNING:
$this->errdesc = 'Warning';
$this->errclass = 'warning';
break;
case E_STRICT:
$this->errdesc = 'Strict Standards';
$this->errclass = 'notice';
break;
case E_USER_ERROR:
case E_ERROR:
case E_RECOVERABLE_ERROR:
$this->fatal = true;
$this->errdesc = 'Fatal Error';
$this->errclass = 'error';
break;
default:
$this->errdesc = 'Unknown Error';
$this->errclass = 'question';
break;
}
}
private function display()
{
AppContext::get_response()->set_status_code(503);
if ($this->fatal)
{
AppContext::get_response()->clean_output();
if (Debug::is_debug_mode_enabled())
{
Debug::fatal($this->exception);
}
else
{
Environment::init_output_bufferization();
echo self::FATAL_MESSAGE;
Environment::destroy();
exit;
}
}
elseif (Debug::is_debug_mode_enabled())
{
$this->display_debug();
}
}
protected function get_stackstrace_as_string($start_trace_index) {
$stack = '[0] ' . Path::get_path_from_root($this->errfile) . ':' . $this->errline;
if (count($this->exception->getTrace()) > 2)
{
$stack .= (Debug::is_output_html() ? '<br />' : "\n");
$stack .= Debug::get_stacktrace_as_string($start_trace_index);
}
return $stack;
}
protected function display_debug()
{
echo '<div class="message-helper ' . $this->errclass . ' error-handler">
<strong>' . $this->errdesc . ' : </strong>' . $this->exception->getMessage() . '<br /><br /><br />
<em>' . $this->get_stackstrace_as_string(6) . '</em>
</div>';
}
protected function display_fatal()
{
$this->display_debug();
}
private function log()
{
self::add_error_in_log($this->exception->getMessage(), $this->get_stackstrace_as_string(4), $this->errno);
}
public static function add_error_in_log($error_msg, $error_stacktrace, $errno = 0)
{
$error_log_file = PATH_TO_ROOT . '/cache/error.log';
self::clear_error_log_file($error_log_file);
self::add_error_in_log_file($error_log_file, $error_msg, $error_stacktrace, $errno);
}
private static function clear_error_log_file($log_file)
{
if (file_exists($log_file) && filesize($log_file) > self::$LOG_FILE_MAX_SIZE)
{
$handle = @fopen($log_file, 'w+');
@ftruncate($handle, 0);
@fclose($handle);
}
}
private static function add_error_in_log_file($log_file, $error_msg, $error_stacktrace, $errno = 0)
{
$handle = @fopen($log_file, 'a+');
$write = @fwrite($handle, self::compute_error_log_string($error_msg, $error_stacktrace, $errno));
$close = @fclose($handle);
if ($handle === false || $write === false || $close === false)
{
echo '<span id="message_handler">Can\'t write error to log file</span>';
}
}
private static function compute_error_log_string($error_msg, $error_stacktrace, $errno = 0)
{
return Date::to_format(time(), 'Y-m-d H:i:s', Timezone::SERVER_TIMEZONE) . "\n" .
$errno . "\n" .
self::clean_error_string($error_msg) . "\n" .
self::clean_error_string($error_stacktrace) . "\n";
}
private static function clean_error_string($message)
{
return preg_replace("`(\n)+`u", '<br />', preg_replace("`\r|\n|\t`u", "\n", $message));
}
public static function get_errno_class($errno)
{
switch ($errno)
{
case E_USER_NOTICE:
case E_NOTICE:
return 'notice';
case E_USER_WARNING:
case E_WARNING:
return 'warning';
case E_USER_ERROR:
case E_ERROR:
case E_RECOVERABLE_ERROR:
return 'error';
default:
return 'question';
}
}
}
?>