| 1 | <?php |
| 2 | /* |
| 3 | +--------------------------------------------------------------------+ |
| 4 | | CiviCRM version 4.7 | |
| 5 | +--------------------------------------------------------------------+ |
| 6 | | Copyright CiviCRM LLC (c) 2004-2016 | |
| 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 | * BAO object for civicrm_cache table. |
| 30 | * |
| 31 | * This is a database cache and is persisted across sessions. Typically we use |
| 32 | * this to store meta data (like profile fields, custom fields etc). |
| 33 | * |
| 34 | * The group_name column is used for grouping together all cache elements that logically belong to the same set. |
| 35 | * Thus all session cache entries are grouped under 'CiviCRM Session'. This allows us to delete all entries of |
| 36 | * a specific group if needed. |
| 37 | * |
| 38 | * The path column allows us to differentiate between items in that group. Thus for the session cache, the path is |
| 39 | * the unique form name for each form (per user) |
| 40 | */ |
| 41 | class CRM_Core_BAO_Cache extends CRM_Core_DAO_Cache { |
| 42 | |
| 43 | /** |
| 44 | * @var array ($cacheKey => $cacheValue) |
| 45 | */ |
| 46 | static $_cache = NULL; |
| 47 | |
| 48 | /** |
| 49 | * Retrieve an item from the DB cache. |
| 50 | * |
| 51 | * @param string $group |
| 52 | * (required) The group name of the item. |
| 53 | * @param string $path |
| 54 | * (required) The path under which this item is stored. |
| 55 | * @param int $componentID |
| 56 | * The optional component ID (so componenets can share the same name space). |
| 57 | * |
| 58 | * @return object |
| 59 | * The data if present in cache, else null |
| 60 | */ |
| 61 | public static function &getItem($group, $path, $componentID = NULL) { |
| 62 | if (self::$_cache === NULL) { |
| 63 | self::$_cache = array(); |
| 64 | } |
| 65 | |
| 66 | $argString = "CRM_CT_{$group}_{$path}_{$componentID}"; |
| 67 | if (!array_key_exists($argString, self::$_cache)) { |
| 68 | $cache = CRM_Utils_Cache::singleton(); |
| 69 | self::$_cache[$argString] = $cache->get($argString); |
| 70 | if (!self::$_cache[$argString]) { |
| 71 | $dao = new CRM_Core_DAO_Cache(); |
| 72 | |
| 73 | $dao->group_name = $group; |
| 74 | $dao->path = $path; |
| 75 | $dao->component_id = $componentID; |
| 76 | |
| 77 | $data = NULL; |
| 78 | if ($dao->find(TRUE)) { |
| 79 | $data = unserialize($dao->data); |
| 80 | } |
| 81 | $dao->free(); |
| 82 | self::$_cache[$argString] = $data; |
| 83 | $cache->set($argString, self::$_cache[$argString]); |
| 84 | } |
| 85 | } |
| 86 | return self::$_cache[$argString]; |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * Retrieve all items in a group. |
| 91 | * |
| 92 | * @param string $group |
| 93 | * (required) The group name of the item. |
| 94 | * @param int $componentID |
| 95 | * The optional component ID (so componenets can share the same name space). |
| 96 | * |
| 97 | * @return object |
| 98 | * The data if present in cache, else null |
| 99 | */ |
| 100 | public static function &getItems($group, $componentID = NULL) { |
| 101 | if (self::$_cache === NULL) { |
| 102 | self::$_cache = array(); |
| 103 | } |
| 104 | |
| 105 | $argString = "CRM_CT_CI_{$group}_{$componentID}"; |
| 106 | if (!array_key_exists($argString, self::$_cache)) { |
| 107 | $cache = CRM_Utils_Cache::singleton(); |
| 108 | self::$_cache[$argString] = $cache->get($argString); |
| 109 | if (!self::$_cache[$argString]) { |
| 110 | $dao = new CRM_Core_DAO_Cache(); |
| 111 | |
| 112 | $dao->group_name = $group; |
| 113 | $dao->component_id = $componentID; |
| 114 | $dao->find(); |
| 115 | |
| 116 | $result = array(); |
| 117 | while ($dao->fetch()) { |
| 118 | $result[$dao->path] = unserialize($dao->data); |
| 119 | } |
| 120 | $dao->free(); |
| 121 | |
| 122 | self::$_cache[$argString] = $result; |
| 123 | $cache->set($argString, self::$_cache[$argString]); |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | return self::$_cache[$argString]; |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * Store an item in the DB cache. |
| 132 | * |
| 133 | * @param object $data |
| 134 | * (required) A reference to the data that will be serialized and stored. |
| 135 | * @param string $group |
| 136 | * (required) The group name of the item. |
| 137 | * @param string $path |
| 138 | * (required) The path under which this item is stored. |
| 139 | * @param int $componentID |
| 140 | * The optional component ID (so componenets can share the same name space). |
| 141 | */ |
| 142 | public static function setItem(&$data, $group, $path, $componentID = NULL) { |
| 143 | if (self::$_cache === NULL) { |
| 144 | self::$_cache = array(); |
| 145 | } |
| 146 | |
| 147 | $dao = new CRM_Core_DAO_Cache(); |
| 148 | |
| 149 | $dao->group_name = $group; |
| 150 | $dao->path = $path; |
| 151 | $dao->component_id = $componentID; |
| 152 | |
| 153 | // get a lock so that multiple ajax requests on the same page |
| 154 | // dont trample on each other |
| 155 | // CRM-11234 |
| 156 | $lock = Civi::lockManager()->acquire("cache.{$group}_{$path}._{$componentID}"); |
| 157 | if (!$lock->isAcquired()) { |
| 158 | CRM_Core_Error::fatal(); |
| 159 | } |
| 160 | |
| 161 | $dao->find(TRUE); |
| 162 | $dao->data = serialize($data); |
| 163 | $dao->created_date = date('YmdHis'); |
| 164 | $dao->save(FALSE); |
| 165 | |
| 166 | $lock->release(); |
| 167 | |
| 168 | $dao->free(); |
| 169 | |
| 170 | // cache coherency - refresh or remove dependent caches |
| 171 | |
| 172 | $argString = "CRM_CT_{$group}_{$path}_{$componentID}"; |
| 173 | $cache = CRM_Utils_Cache::singleton(); |
| 174 | $data = unserialize($dao->data); |
| 175 | self::$_cache[$argString] = $data; |
| 176 | $cache->set($argString, $data); |
| 177 | |
| 178 | $argString = "CRM_CT_CI_{$group}_{$componentID}"; |
| 179 | unset(self::$_cache[$argString]); |
| 180 | $cache->delete($argString); |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * Delete all the cache elements that belong to a group OR delete the entire cache if group is not specified. |
| 185 | * |
| 186 | * @param string $group |
| 187 | * The group name of the entries to be deleted. |
| 188 | * @param string $path |
| 189 | * Path of the item that needs to be deleted. |
| 190 | * @param bool $clearAll clear all caches |
| 191 | */ |
| 192 | public static function deleteGroup($group = NULL, $path = NULL, $clearAll = TRUE) { |
| 193 | $dao = new CRM_Core_DAO_Cache(); |
| 194 | |
| 195 | if (!empty($group)) { |
| 196 | $dao->group_name = $group; |
| 197 | } |
| 198 | |
| 199 | if (!empty($path)) { |
| 200 | $dao->path = $path; |
| 201 | } |
| 202 | |
| 203 | $dao->delete(); |
| 204 | |
| 205 | if ($clearAll) { |
| 206 | // also reset ACL Cache |
| 207 | CRM_ACL_BAO_Cache::resetCache(); |
| 208 | |
| 209 | // also reset memory cache if any |
| 210 | CRM_Utils_System::flushCache(); |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * The next two functions are internal functions used to store and retrieve session from |
| 216 | * the database cache. This keeps the session to a limited size and allows us to |
| 217 | * create separate session scopes for each form in a tab |
| 218 | */ |
| 219 | |
| 220 | /** |
| 221 | * This function takes entries from the session array and stores it in the cache. |
| 222 | * |
| 223 | * It also deletes the entries from the $_SESSION object (for a smaller session size) |
| 224 | * |
| 225 | * @param array $names |
| 226 | * Array of session values that should be persisted. |
| 227 | * This is either a form name + qfKey or just a form name |
| 228 | * (in the case of profile) |
| 229 | * @param bool $resetSession |
| 230 | * Should session state be reset on completion of DB store?. |
| 231 | */ |
| 232 | public static function storeSessionToCache($names, $resetSession = TRUE) { |
| 233 | foreach ($names as $key => $sessionName) { |
| 234 | if (is_array($sessionName)) { |
| 235 | $value = NULL; |
| 236 | if (!empty($_SESSION[$sessionName[0]][$sessionName[1]])) { |
| 237 | $value = $_SESSION[$sessionName[0]][$sessionName[1]]; |
| 238 | } |
| 239 | self::setItem($value, 'CiviCRM Session', "{$sessionName[0]}_{$sessionName[1]}"); |
| 240 | if ($resetSession) { |
| 241 | $_SESSION[$sessionName[0]][$sessionName[1]] = NULL; |
| 242 | unset($_SESSION[$sessionName[0]][$sessionName[1]]); |
| 243 | } |
| 244 | } |
| 245 | else { |
| 246 | $value = NULL; |
| 247 | if (!empty($_SESSION[$sessionName])) { |
| 248 | $value = $_SESSION[$sessionName]; |
| 249 | } |
| 250 | self::setItem($value, 'CiviCRM Session', $sessionName); |
| 251 | if ($resetSession) { |
| 252 | $_SESSION[$sessionName] = NULL; |
| 253 | unset($_SESSION[$sessionName]); |
| 254 | } |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | self::cleanup(); |
| 259 | } |
| 260 | |
| 261 | /* Retrieve the session values from the cache and populate the $_SESSION array |
| 262 | * |
| 263 | * @param array $names |
| 264 | * Array of session values that should be persisted. |
| 265 | * This is either a form name + qfKey or just a form name |
| 266 | * (in the case of profile) |
| 267 | */ |
| 268 | |
| 269 | /** |
| 270 | * Restore session from cache. |
| 271 | * |
| 272 | * @param string $names |
| 273 | */ |
| 274 | public static function restoreSessionFromCache($names) { |
| 275 | foreach ($names as $key => $sessionName) { |
| 276 | if (is_array($sessionName)) { |
| 277 | $value = self::getItem('CiviCRM Session', |
| 278 | "{$sessionName[0]}_{$sessionName[1]}" |
| 279 | ); |
| 280 | if ($value) { |
| 281 | $_SESSION[$sessionName[0]][$sessionName[1]] = $value; |
| 282 | } |
| 283 | } |
| 284 | else { |
| 285 | $value = self::getItem('CiviCRM Session', |
| 286 | $sessionName |
| 287 | ); |
| 288 | if ($value) { |
| 289 | $_SESSION[$sessionName] = $value; |
| 290 | } |
| 291 | } |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | /** |
| 296 | * Do periodic cleanup of the CiviCRM session table. |
| 297 | * |
| 298 | * Also delete all session cache entries which are a couple of days old. |
| 299 | * This keeps the session cache to a manageable size |
| 300 | * |
| 301 | * @param bool $session |
| 302 | * @param bool $table |
| 303 | * @param bool $prevNext |
| 304 | */ |
| 305 | public static function cleanup($session = FALSE, $table = FALSE, $prevNext = FALSE) { |
| 306 | // clean up the session cache every $cacheCleanUpNumber probabilistically |
| 307 | $cleanUpNumber = 757; |
| 308 | |
| 309 | // clean up all sessions older than $cacheTimeIntervalDays days |
| 310 | $timeIntervalDays = 2; |
| 311 | $timeIntervalMins = 30; |
| 312 | |
| 313 | if (mt_rand(1, 100000) % $cleanUpNumber == 0) { |
| 314 | $session = $table = $prevNext = TRUE; |
| 315 | } |
| 316 | |
| 317 | if (!$session && !$table && !$prevNext) { |
| 318 | return; |
| 319 | } |
| 320 | |
| 321 | if ($prevNext) { |
| 322 | // delete all PrevNext caches |
| 323 | CRM_Core_BAO_PrevNextCache::cleanupCache(); |
| 324 | } |
| 325 | |
| 326 | if ($table) { |
| 327 | CRM_Core_Config::clearTempTables($timeIntervalDays . ' day'); |
| 328 | } |
| 329 | |
| 330 | if ($session) { |
| 331 | // first delete all sessions which are related to any potential transaction |
| 332 | // page |
| 333 | $transactionPages = array( |
| 334 | 'CRM_Contribute_Controller_Contribution', |
| 335 | 'CRM_Event_Controller_Registration', |
| 336 | ); |
| 337 | |
| 338 | $params = array( |
| 339 | 1 => array( |
| 340 | date('Y-m-d H:i:s', time() - $timeIntervalMins * 60), |
| 341 | 'String', |
| 342 | ), |
| 343 | ); |
| 344 | foreach ($transactionPages as $trPage) { |
| 345 | $params[] = array("%${trPage}%", 'String'); |
| 346 | $where[] = 'path LIKE %' . count($params); |
| 347 | } |
| 348 | |
| 349 | $sql = " |
| 350 | DELETE FROM civicrm_cache |
| 351 | WHERE group_name = 'CiviCRM Session' |
| 352 | AND created_date <= %1 |
| 353 | AND (" . implode(' OR ', $where) . ")"; |
| 354 | CRM_Core_DAO::executeQuery($sql, $params); |
| 355 | |
| 356 | $sql = " |
| 357 | DELETE FROM civicrm_cache |
| 358 | WHERE group_name = 'CiviCRM Session' |
| 359 | AND created_date < date_sub( NOW( ), INTERVAL $timeIntervalDays DAY ) |
| 360 | "; |
| 361 | CRM_Core_DAO::executeQuery($sql); |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | } |