CRM/Queue/ErrorPolicy.php

   1 <?php
   2 /*
   3  +--------------------------------------------------------------------+
   4  | CiviCRM version 4.5                                                |
   5  +--------------------------------------------------------------------+
   6  | Copyright CiviCRM LLC (c) 2004-2014                                |
   7  +--------------------------------------------------------------------+
   8  | This file is a part of CiviCRM.                                    |
   9  |                                                                    |
  10  | CiviCRM is free software; you can copy, modify, and distribute it  |
  11  | under the terms of the GNU Affero General Public License           |
  12  | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
  13  |                                                                    |
  14  | CiviCRM is distributed in the hope that it will be useful, but     |
  15  | WITHOUT ANY WARRANTY; without even the implied warranty of         |
  16  | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.               |
  17  | See the GNU Affero General Public License for more details.        |
  18  |                                                                    |
  19  | You should have received a copy of the GNU Affero General Public   |
  20  | License and the CiviCRM Licensing Exception along                  |
  21  | with this program; if not, contact CiviCRM LLC                     |
  22  | at info[AT]civicrm[DOT]org. If you have questions about the        |
  23  | GNU Affero General Public License or the licensing of CiviCRM,     |
  24  | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
  25  +--------------------------------------------------------------------+
  26 */
  27
  28 /**
  29  * To ensure that PHP errors or unhandled exceptions are reported in JSON format,
  30  * wrap this around your code. For example:
  31  *
  32  * @code
  33  * $errorContainer = new CRM_Queue_ErrorPolicy();
  34  * $errorContainer->call(function(){
  35  *    ...include some files, do some work, etc...
  36  * });
  37  * @endcode
  38  *
  39  * Note: Most of the code in this class is pretty generic vis-a-vis error
  40  * handling -- except for 'reportError', whose message format is only
  41  * appropriate for use with the CRM_Queue_Page_AJAX.  Some kind of cleanup
  42  * will be necessary to get reuse from the other parts of this class.
  43  */
  44 class CRM_Queue_ErrorPolicy {
  45   var $active;
  46
  47   /**
  48    * @param null $level
  49    */
  50   function __construct($level = NULL) {
  51     register_shutdown_function(array($this, 'onShutdown'));
  52     if ($level === NULL) {
  53       $level = E_ERROR | E_PARSE | E_CORE_ERROR | E_COMPILE_ERROR | E_USER_ERROR | E_RECOVERABLE_ERROR;
  54     }
  55     $this->level = $level;
  56   }
  57
  58   function activate() {
  59     $this->active = TRUE;
  60     $this->backup = array();
  61     foreach (array(
  62       'display_errors', 'html_errors', 'xmlrpc_errors') as $key) {
  63       $this->backup[$key] = ini_get($key);
  64       ini_set($key, 0);
  65     }
  66     set_error_handler(array($this, 'onError'), $this->level);
  67     // FIXME make this temporary/reversible
  68     $this->errorScope = CRM_Core_TemporaryErrorScope::useException();
  69   }
  70
  71   function deactivate() {
  72     $this->errorScope = NULL;
  73     restore_error_handler();
  74     foreach (array(
  75       'display_errors', 'html_errors', 'xmlrpc_errors') as $key) {
  76       ini_set($key, $this->backup[$key]);
  77     }
  78     $this->active = FALSE;
  79   }
  80
  81   /**
  82    * @param $callable
  83    *
  84    * @return mixed
  85    */
  86   function call($callable) {
  87     $this->activate();
  88     try {
  89       $result = $callable();
  90     }
  91     catch(Exception$e) {
  92       $this->reportException($e);
  93     }
  94     $this->deactivate();
  95     return $result;
  96   }
  97
  98   /**
  99    * Receive (semi) recoverable error notices
 100    *
 101    * @see set_error_handler
 102    */
 103   function onError($errno, $errstr, $errfile, $errline) {
 104     if (!(error_reporting() & $errno)) {
 105       return TRUE;
 106     }
 107     throw new Exception(sprintf('PHP Error %s at %s:%s: %s', $errno, $errfile, $errline, $errstr));
 108   }
 109
 110   /**
 111    * Receive non-recoverable error notices
 112    *
 113    * @see register_shutdown_function
 114    * @see error_get_last
 115    */
 116   function onShutdown() {
 117     if (!$this->active) {
 118       return;
 119     }
 120     $error = error_get_last();
 121     if (is_array($error) && ($error['type'] & $this->level)) {
 122       $this->reportError($error);
 123     }
 124   }
 125
 126   /**
 127    * Print a fatal error
 128    *
 129    * @param $error
 130    */
 131   function reportError($error) {
 132     $response = array(
 133       'is_error' => 1,
 134       'is_continue' => 0,
 135       'exception' => htmlentities(sprintf('Error %s: %s in %s, line %s', $error['type'], $error['message'], $error['file'], $error['line'])),
 136     );
 137     global $activeQueueRunner;
 138     if (is_object($activeQueueRunner)) {
 139       $response['last_task_title'] = $activeQueueRunner->lastTaskTitle;
 140     }
 141     CRM_Core_Error::debug_var('CRM_Queue_ErrorPolicy_reportError', $response);
 142     echo json_encode($response);
 143     // civiExit() is unnecessary -- we're only called as part of abend
 144   }
 145
 146   /**
 147    * Print an unhandled exception
 148    *
 149    * @param $e
 150    */
 151   function reportException(Exception $e) {
 152     CRM_Core_Error::debug_var('CRM_Queue_ErrorPolicy_reportException', CRM_Core_Error::formatTextException($e));
 153
 154     $response = array(
 155       'is_error' => 1,
 156       'is_continue' => 0,
 157     );
 158
 159     $config = CRM_Core_Config::singleton();
 160     if ($config->backtrace || CRM_Core_Config::isUpgradeMode()) {
 161       $response['exception'] = CRM_Core_Error::formatHtmlException($e);
 162     }
 163     else {
 164       $response['exception'] = htmlentities($e->getMessage());
 165     }
 166
 167     global $activeQueueRunner;
 168     if (is_object($activeQueueRunner)) {
 169       $response['last_task_title'] = $activeQueueRunner->lastTaskTitle;
 170     }
 171     CRM_Utils_JSON::output($response);
 172   }
 173 }
 174