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   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * Support library for the cache PHPUnit tests.
  19   *
  20   * This file is part of Moodle's cache API, affectionately called MUC.
  21   * It contains the components that are requried in order to use caching.
  22   *
  23   * @package    core
  24   * @category   cache
  25   * @copyright  2012 Sam Hemelryk
  26   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  27   */
  28  
  29  defined('MOODLE_INTERNAL') || die();
  30  
  31  require_once($CFG->dirroot.'/cache/locallib.php');
  32  
  33  /**
  34   * Override the default cache configuration for our own maniacal purposes.
  35   *
  36   * This class was originally named cache_config_phpunittest but was renamed in 2.9
  37   * because it is used for both unit tests and acceptance tests.
  38   *
  39   * @since 2.9
  40   * @copyright 2012 Sam Hemelryk
  41   * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  42   */
  43  class cache_config_testing extends cache_config_writer {
  44  
  45      /**
  46       * Creates the default configuration and saves it.
  47       *
  48       * This function calls config_save, however it is safe to continue using it afterwards as this function should only ever
  49       * be called when there is no configuration file already.
  50       *
  51       * @param bool $forcesave If set to true then we will forcefully save the default configuration file.
  52       * @return true|array Returns true if the default configuration was successfully created.
  53       *     Returns a configuration array if it could not be saved. This is a bad situation. Check your error logs.
  54       */
  55      public static function create_default_configuration($forcesave = false) {
  56          global $CFG;
  57          // HACK ALERT.
  58          // We probably need to come up with a better way to create the default stores, or at least ensure 100% that the
  59          // default store plugins are protected from deletion.
  60          $writer = new self;
  61          $writer->configstores = self::get_default_stores();
  62          $writer->configdefinitions = self::locate_definitions();
  63          $defaultapplication = 'default_application';
  64  
  65          $appdefine = defined('TEST_CACHE_USING_APPLICATION_STORE') ? TEST_CACHE_USING_APPLICATION_STORE : false;
  66          if ($appdefine !== false && preg_match('/^[a-zA-Z][a-zA-Z0-9_]+$/', $appdefine)) {
  67              $expectedstore = $appdefine;
  68              $file = $CFG->dirroot.'/cache/stores/'.$appdefine.'/lib.php';
  69              $class = 'cachestore_'.$appdefine;
  70              if (file_exists($file)) {
  71                  require_once($file);
  72              }
  73              if (class_exists($class) && $class::ready_to_be_used_for_testing()) {
  74                  /* @var cache_store $class */
  75                  $writer->configstores['test_application'] = array(
  76                      'name' => 'test_application',
  77                      'plugin' => $expectedstore,
  78                      'modes' => $class::get_supported_modes(),
  79                      'features' => $class::get_supported_features(),
  80                      'configuration' => $class::unit_test_configuration()
  81                  );
  82  
  83                  $defaultapplication = 'test_application';
  84              }
  85          }
  86  
  87          $writer->configmodemappings = array(
  88              array(
  89                  'mode' => cache_store::MODE_APPLICATION,
  90                  'store' => $defaultapplication,
  91                  'sort' => -1
  92              ),
  93              array(
  94                  'mode' => cache_store::MODE_SESSION,
  95                  'store' => 'default_session',
  96                  'sort' => -1
  97              ),
  98              array(
  99                  'mode' => cache_store::MODE_REQUEST,
 100                  'store' => 'default_request',
 101                  'sort' => -1
 102              )
 103          );
 104          $writer->configlocks = array(
 105              'default_file_lock' => array(
 106                  'name' => 'cachelock_file_default',
 107                  'type' => 'cachelock_file',
 108                  'dir' => 'filelocks',
 109                  'default' => true
 110              )
 111          );
 112  
 113          $factory = cache_factory::instance();
 114          // We expect the cache to be initialising presently. If its not then something has gone wrong and likely
 115          // we are now in a loop.
 116          if (!$forcesave && $factory->get_state() !== cache_factory::STATE_INITIALISING) {
 117              return $writer->generate_configuration_array();
 118          }
 119          $factory->set_state(cache_factory::STATE_SAVING);
 120          $writer->config_save();
 121          return true;
 122      }
 123  
 124      /**
 125       * Returns the expected path to the configuration file.
 126       *
 127       * We override this function to add handling for $CFG->altcacheconfigpath.
 128       * We want to support it so that people can run unit tests against alternative cache setups.
 129       * However we don't want to ever make changes to the file at $CFG->altcacheconfigpath so we
 130       * always use dataroot and copy the alt file there as required.
 131       *
 132       * @throws cache_exception
 133       * @return string The absolute path
 134       */
 135      protected static function get_config_file_path() {
 136          global $CFG;
 137          // We always use this path.
 138          $configpath = $CFG->dataroot.'/muc/config.php';
 139  
 140          if (!empty($CFG->altcacheconfigpath)) {
 141  
 142              // No need to check we are within a test here, this is the cache config class that gets used
 143              // only when one of those is true.
 144              if  (!defined('TEST_CACHE_USING_ALT_CACHE_CONFIG_PATH') || !TEST_CACHE_USING_ALT_CACHE_CONFIG_PATH) {
 145                  // TEST_CACHE_USING_ALT_CACHE_CONFIG_PATH has not being defined or is false, we want to use the default.
 146                  return $configpath;
 147              }
 148  
 149              $path = $CFG->altcacheconfigpath;
 150              if (is_dir($path) && is_writable($path)) {
 151                  // Its a writable directory, thats fine. Convert it to a file.
 152                  $path = $CFG->altcacheconfigpath.'/cacheconfig.php';
 153              }
 154              if (is_readable($path)) {
 155                  $directory = dirname($configpath);
 156                  if ($directory !== $CFG->dataroot && !file_exists($directory)) {
 157                      $result = make_writable_directory($directory, false);
 158                      if (!$result) {
 159                          throw new cache_exception('ex_configcannotsave', 'cache', '', null, 'Cannot create config directory. Check the permissions on your moodledata directory.');
 160                      }
 161                  }
 162                  // We don't care that this fails but we should let the developer know.
 163                  if (!is_readable($configpath) && !@copy($path, $configpath)) {
 164                      debugging('Failed to copy alt cache config file to required location');
 165                  }
 166              }
 167          }
 168  
 169          // We always use the dataroot location.
 170          return $configpath;
 171      }
 172  
 173      /**
 174       * Adds a definition to the stack
 175       * @param string $area
 176       * @param array $properties
 177       * @param bool $addmapping By default this method adds a definition and a mapping for that definition. You can
 178       *    however set this to false if you only want it to add the definition and not the mapping.
 179       */
 180      public function phpunit_add_definition($area, array $properties, $addmapping = true) {
 181          if (!array_key_exists('overrideclass', $properties)) {
 182              switch ($properties['mode']) {
 183                  case cache_store::MODE_APPLICATION:
 184                      $properties['overrideclass'] = 'cache_phpunit_application';
 185                      break;
 186                  case cache_store::MODE_SESSION:
 187                      $properties['overrideclass'] = 'cache_phpunit_session';
 188                      break;
 189                  case cache_store::MODE_REQUEST:
 190                      $properties['overrideclass'] = 'cache_phpunit_request';
 191                      break;
 192              }
 193          }
 194          $this->configdefinitions[$area] = $properties;
 195          if ($addmapping) {
 196              switch ($properties['mode']) {
 197                  case cache_store::MODE_APPLICATION:
 198                      $this->phpunit_add_definition_mapping($area, 'default_application', 0);
 199                      break;
 200                  case cache_store::MODE_SESSION:
 201                      $this->phpunit_add_definition_mapping($area, 'default_session', 0);
 202                      break;
 203                  case cache_store::MODE_REQUEST:
 204                      $this->phpunit_add_definition_mapping($area, 'default_request', 0);
 205                      break;
 206              }
 207          }
 208      }
 209  
 210      /**
 211       * Removes a definition.
 212       * @param string $name
 213       */
 214      public function phpunit_remove_definition($name) {
 215          unset($this->configdefinitions[$name]);
 216      }
 217  
 218      /**
 219       * Removes the configured stores so that there are none available.
 220       */
 221      public function phpunit_remove_stores() {
 222          $this->configstores = array();
 223      }
 224  
 225      /**
 226       * Forcefully adds a file store.
 227       *
 228       * You can turn off native TTL support if you want a way to test TTL wrapper objects.
 229       *
 230       * @param string $name
 231       * @param bool $nativettl If false, uses fixture that turns off native TTL support
 232       */
 233      public function phpunit_add_file_store(string $name, bool $nativettl = true): void {
 234          if (!$nativettl) {
 235              require_once (__DIR__ . '/cachestore_file_with_ttl_wrappers.php');
 236          }
 237          $this->configstores[$name] = array(
 238              'name' => $name,
 239              'plugin' => 'file',
 240              'configuration' => array(
 241                  'path' => ''
 242              ),
 243              'features' => 6,
 244              'modes' => 3,
 245              'mappingsonly' => false,
 246              'class' => $nativettl ? 'cachestore_file' : 'cachestore_file_with_ttl_wrappers',
 247              'default' => false,
 248              'lock' => 'cachelock_file_default'
 249          );
 250      }
 251  
 252      /**
 253       * Hacks the in-memory configuration for a store.
 254       *
 255       * @param string $store Name of store to edit e.g. 'default_application'
 256       * @param array $configchanges List of config changes
 257       */
 258      public function phpunit_edit_store_config(string $store, array $configchanges): void {
 259          foreach ($configchanges as $name => $value) {
 260              $this->configstores[$store]['configuration'][$name] = $value;
 261          }
 262      }
 263  
 264      /**
 265       * Forcefully adds a session store.
 266       *
 267       * @param string $name
 268       */
 269      public function phpunit_add_session_store($name) {
 270          $this->configstores[$name] = array(
 271              'name' => $name,
 272              'plugin' => 'session',
 273              'configuration' => array(),
 274              'features' => 14,
 275              'modes' => 2,
 276              'default' => true,
 277              'class' => 'cachestore_session',
 278              'lock' => 'cachelock_file_default',
 279          );
 280      }
 281  
 282      /**
 283       * Forcefully injects a definition => store mapping.
 284       *
 285       * This function does no validation, you should only be calling if it you know
 286       * exactly what to expect.
 287       *
 288       * @param string $definition
 289       * @param string $store
 290       * @param int $sort
 291       */
 292      public function phpunit_add_definition_mapping($definition, $store, $sort) {
 293          $this->configdefinitionmappings[] = array(
 294              'store' => $store,
 295              'definition' => $definition,
 296              'sort' => (int)$sort
 297          );
 298      }
 299  
 300      /**
 301       * Overrides the default site identifier used by the Cache API so that we can be sure of what it is.
 302       *
 303       * @return string
 304       */
 305      public function get_site_identifier() {
 306          global $CFG;
 307          return $CFG->wwwroot.'phpunit';
 308      }
 309  
 310      /**
 311       * Checks if the configuration file exists.
 312       *
 313       * @return bool True if it exists
 314       */
 315      public static function config_file_exists() {
 316          // Allow for late static binding by using static.
 317          $configfilepath = static::get_config_file_path();
 318  
 319          // Invalidate opcode php cache, so we get correct status of file.
 320          core_component::invalidate_opcode_php_cache($configfilepath);
 321          return file_exists($configfilepath);
 322      }
 323  }
 324  
 325  
 326  /**
 327   * Dummy object for testing cacheable object interface and interaction
 328   *
 329   * Wake from cache needs specific testing at times to ensure that during multiple
 330   * cache get() requests it's possible to verify that it's getting woken each time.
 331   *
 332   * @copyright  2012 Sam Hemelryk
 333   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 334   */
 335  class cache_phpunit_dummy_object extends stdClass implements cacheable_object {
 336      /**
 337       * Test property 1
 338       * @var string
 339       */
 340      public $property1;
 341      /**
 342       * Test property 1
 343       * @var string
 344       */
 345      public $property2;
 346      /**
 347       * Test property time for verifying wake is run at each get() call.
 348       * @var float
 349       */
 350      public $propertytime;
 351      /**
 352       * Constructor
 353       * @param string $property1
 354       * @param string $property2
 355       */
 356      public function __construct($property1, $property2, $propertytime = null) {
 357          $this->property1 = $property1;
 358          $this->property2 = $property2;
 359          $this->propertytime = $propertytime === null ? microtime(true) : $propertytime;
 360      }
 361      /**
 362       * Prepares this object for caching
 363       * @return array
 364       */
 365      public function prepare_to_cache() {
 366          return array($this->property1.'_ptc', $this->property2.'_ptc', $this->propertytime);
 367      }
 368      /**
 369       * Returns this object from the cache
 370       * @param array $data
 371       * @return cache_phpunit_dummy_object
 372       */
 373      public static function wake_from_cache($data) {
 374          $time = null;
 375          if (!is_null($data[2])) {
 376              // Windows 32bit microtime() resolution is 15ms, we ensure the time has moved forward.
 377              do {
 378                  $time = microtime(true);
 379              } while ($time == $data[2]);
 380  
 381          }
 382          return new cache_phpunit_dummy_object(array_shift($data).'_wfc', array_shift($data).'_wfc', $time);
 383      }
 384  }
 385  
 386  /**
 387   * Dummy data source object for testing data source interface and implementation
 388   *
 389   * @copyright  2012 Sam Hemelryk
 390   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 391   */
 392  class cache_phpunit_dummy_datasource implements cache_data_source {
 393      /**
 394       * Returns an instance of this object for use with the cache.
 395       *
 396       * @param cache_definition $definition
 397       * @return cache_phpunit_dummy_datasource
 398       */
 399      public static function get_instance_for_cache(cache_definition $definition) {
 400          return new cache_phpunit_dummy_datasource();
 401      }
 402  
 403      /**
 404       * Loads a key for the cache.
 405       *
 406       * @param string $key
 407       * @return string
 408       */
 409      public function load_for_cache($key) {
 410          return $key.' has no value really.';
 411      }
 412  
 413      /**
 414       * Loads many keys for the cache
 415       *
 416       * @param array $keys
 417       * @return array
 418       */
 419      public function load_many_for_cache(array $keys) {
 420          $return = array();
 421          foreach ($keys as $key) {
 422              $return[$key] = $key.' has no value really.';
 423          }
 424          return $return;
 425      }
 426  }
 427  
 428  /**
 429   * PHPUnit application cache loader.
 430   *
 431   * Used to expose things we could not otherwise see within an application cache.
 432   *
 433   * @copyright  2012 Sam Hemelryk
 434   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 435   */
 436  class cache_phpunit_application extends cache_application {
 437  
 438      /**
 439       * Returns the class of the store immediately associated with this cache.
 440       * @return string
 441       */
 442      public function phpunit_get_store_class() {
 443          return get_class($this->get_store());
 444      }
 445  
 446      /**
 447       * Returns all the interfaces the cache store implements.
 448       * @return array
 449       */
 450      public function phpunit_get_store_implements() {
 451          return class_implements($this->get_store());
 452      }
 453  
 454      /**
 455       * Returns the given key directly from the static acceleration array.
 456       *
 457       * @param string $key
 458       * @return false|mixed
 459       */
 460      public function phpunit_static_acceleration_get($key) {
 461          return $this->static_acceleration_get($key);
 462      }
 463  
 464      /**
 465       * Purges only the static acceleration while leaving the rest of the store in tack.
 466       *
 467       * Used for behaving like you have loaded 2 pages, and reset static while the backing store
 468       * still contains all the same data.
 469       *
 470       */
 471      public function phpunit_static_acceleration_purge() {
 472          $this->static_acceleration_purge();
 473      }
 474  }
 475  
 476  /**
 477   * PHPUnit session cache loader.
 478   *
 479   * Used to expose things we could not otherwise see within an session cache.
 480   *
 481   * @copyright  2012 Sam Hemelryk
 482   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 483   */
 484  class cache_phpunit_session extends cache_session {
 485  
 486      /** @var Static member used for emulating the behaviour of session_id() during the tests. */
 487      protected static $sessionidmockup = 'phpunitmockupsessionid';
 488  
 489      /**
 490       * Returns the class of the store immediately associated with this cache.
 491       * @return string
 492       */
 493      public function phpunit_get_store_class() {
 494          return get_class($this->get_store());
 495      }
 496  
 497      /**
 498       * Returns all the interfaces the cache store implements.
 499       * @return array
 500       */
 501      public function phpunit_get_store_implements() {
 502          return class_implements($this->get_store());
 503      }
 504  
 505      /**
 506       * Provide access to the {@link cache_session::get_key_prefix()} method.
 507       *
 508       * @return string
 509       */
 510      public function phpunit_get_key_prefix() {
 511          return $this->get_key_prefix();
 512      }
 513  
 514      /**
 515       * Allows to inject the session identifier.
 516       *
 517       * @param string $sessionid
 518       */
 519      public static function phpunit_mockup_session_id($sessionid) {
 520          static::$sessionidmockup = $sessionid;
 521      }
 522  
 523      /**
 524       * Override the parent behaviour so that it does not need the actual session_id() call.
 525       */
 526      protected function set_session_id() {
 527          $this->sessionid = static::$sessionidmockup;
 528      }
 529  }
 530  
 531  /**
 532   * PHPUnit request cache loader.
 533   *
 534   * Used to expose things we could not otherwise see within an request cache.
 535   *
 536   * @copyright  2012 Sam Hemelryk
 537   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 538   */
 539  class cache_phpunit_request extends cache_request {
 540  
 541      /**
 542       * Returns the class of the store immediately associated with this cache.
 543       * @return string
 544       */
 545      public function phpunit_get_store_class() {
 546          return get_class($this->get_store());
 547      }
 548  
 549      /**
 550       * Returns all the interfaces the cache store implements.
 551       * @return array
 552       */
 553      public function phpunit_get_store_implements() {
 554          return class_implements($this->get_store());
 555      }
 556  }
 557  
 558  /**
 559   * Dummy overridden cache loader class that we can use to test overriding loader functionality.
 560   *
 561   * @copyright  2012 Sam Hemelryk
 562   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 563   */
 564  class cache_phpunit_dummy_overrideclass extends cache_application {
 565      // Satisfying the code pre-checker is just part of my day job.
 566  }
 567  
 568  /**
 569   * Cache PHPUnit specific factory.
 570   *
 571   * @copyright  2012 Sam Hemelryk
 572   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 573   */
 574  class cache_phpunit_factory extends cache_factory {
 575      /**
 576       * Exposes the cache_factory's disable method.
 577       *
 578       * Perhaps one day that method will be made public, for the time being it is protected.
 579       */
 580      public static function phpunit_disable() {
 581          parent::disable();
 582      }
 583  }
 584  
 585  /**
 586   * Cache PHPUnit specific Cache helper.
 587   *
 588   * @copyright  2018 Andrew Nicols <andrew@nicols.co.uk>
 589   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 590   */
 591  class cache_phpunit_cache extends cache {
 592      /**
 593       * Make the changes which simulate a new request within the cache.
 594       * This essentially resets currently held static values in the class, and increments the current timestamp.
 595       */
 596      public static function simulate_new_request() {
 597          self::$now += 0.1;
 598          self::$purgetoken = null;
 599      }
 600  }