mirror of
https://github.com/moodle/moodle.git
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675 lines
27 KiB
PHP
675 lines
27 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* The supplementary cache API.
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*
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* This file is part of Moodle's cache API, affectionately called MUC.
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* It contains elements of the API that are not required in order to use caching.
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* Things in here are more in line with administration and management of the cache setup and configuration.
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*
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* @package core
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* @category cache
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* @copyright 2012 Sam Hemelryk
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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/**
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* Cache configuration writer.
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*
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* This class should only be used when you need to write to the config, all read operations exist within the cache_config.
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*
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* @package core
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* @category cache
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* @copyright 2012 Sam Hemelryk
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class cache_config_writer extends cache_config {
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/**
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* Switch that gets set to true when ever a cache_config_writer instance is saving the cache configuration file.
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* If this is set to true when save is next called we must avoid the trying to save and instead return the
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* generated config so that is may be used instead of the file.
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* @var bool
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*/
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protected static $creatingconfig = false;
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/**
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* Returns an instance of the configuration writer.
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*
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* @return cache_config_writer
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*/
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public static function instance() {
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$factory = cache_factory::instance();
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return $factory->create_config_instance(true);
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}
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/**
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* Saves the current configuration.
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*
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* Exceptions within this function are tolerated but must be of type cache_exception.
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* They are caught during initialisation and written to the error log. This is required in order to avoid
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* infinite loop situations caused by the cache throwing exceptions during its initialisation.
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*/
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protected function config_save() {
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global $CFG;
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static $confighash = '';
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$cachefile = static::get_config_file_path();
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$directory = dirname($cachefile);
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if ($directory !== $CFG->dataroot && !file_exists($directory)) {
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$result = make_writable_directory($directory, false);
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if (!$result) {
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throw new cache_exception('ex_configcannotsave', 'cache', '', null, 'Cannot create config directory. Check the permissions on your moodledata directory.');
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}
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}
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if (!file_exists($directory) || !is_writable($directory)) {
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throw new cache_exception('ex_configcannotsave', 'cache', '', null, 'Config directory is not writable. Check the permissions on the moodledata/muc directory.');
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}
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// Prepare a configuration array to store.
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$configuration = $this->generate_configuration_array();
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// Prepare the file content.
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$content = "<?php defined('MOODLE_INTERNAL') || die();\n \$configuration = ".var_export($configuration, true).";";
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// Do both file content and hash based detection because this might be called
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// many times within a single request.
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$hash = sha1($content);
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if (($hash === $confighash) || (file_exists($cachefile) && $content === file_get_contents($cachefile))) {
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// Config is unchanged so don't bother locking and writing.
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$confighash = $hash;
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return;
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}
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// We need to create a temporary cache lock instance for use here. Remember we are generating the config file
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// it doesn't exist and thus we can't use the normal API for this (it'll just try to use config).
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$lockconf = reset($this->configlocks);
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if ($lockconf === false) {
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debugging('Your cache configuration file is out of date and needs to be refreshed.', DEBUG_DEVELOPER);
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// Use the default
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$lockconf = array(
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'name' => 'cachelock_file_default',
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'type' => 'cachelock_file',
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'dir' => 'filelocks',
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'default' => true
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);
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}
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$factory = cache_factory::instance();
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$locking = $factory->create_lock_instance($lockconf);
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if ($locking->lock('configwrite', 'config', true)) {
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$tempcachefile = "{$cachefile}.tmp";
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// Its safe to use w mode here because we have already acquired the lock.
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$handle = fopen($tempcachefile, 'w');
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fwrite($handle, $content);
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fflush($handle);
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fclose($handle);
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$locking->unlock('configwrite', 'config');
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@chmod($tempcachefile, $CFG->filepermissions);
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rename($tempcachefile, $cachefile);
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// Tell PHP to recompile the script.
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core_component::invalidate_opcode_php_cache($cachefile);
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} else {
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throw new cache_exception('ex_configcannotsave', 'cache', '', null, 'Unable to open the cache config file.');
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}
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}
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/**
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* Generates a configuration array suitable to be written to the config file.
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* @return array
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*/
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protected function generate_configuration_array() {
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$configuration = array();
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$configuration['siteidentifier'] = $this->siteidentifier;
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$configuration['stores'] = $this->configstores;
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$configuration['modemappings'] = $this->configmodemappings;
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$configuration['definitions'] = $this->configdefinitions;
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$configuration['definitionmappings'] = $this->configdefinitionmappings;
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$configuration['locks'] = $this->configlocks;
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return $configuration;
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}
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/**
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* Adds a plugin instance.
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*
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* This function also calls save so you should redirect immediately, or at least very shortly after
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* calling this method.
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*
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* @param string $name The name for the instance (must be unique)
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* @param string $plugin The name of the plugin.
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* @param array $configuration The configuration data for the plugin instance.
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* @return bool
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* @throws cache_exception
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*/
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public function add_store_instance($name, $plugin, array $configuration = array()) {
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if (array_key_exists($name, $this->configstores)) {
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throw new cache_exception('Duplicate name specificed for cache plugin instance. You must provide a unique name.');
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}
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$class = 'cachestore_'.$plugin;
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if (!class_exists($class)) {
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$plugins = core_component::get_plugin_list_with_file('cachestore', 'lib.php');
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if (!array_key_exists($plugin, $plugins)) {
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throw new cache_exception('Invalid plugin name specified. The plugin does not exist or is not valid.');
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}
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$file = $plugins[$plugin];
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if (file_exists($file)) {
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require_once($file);
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}
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if (!class_exists($class)) {
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throw new cache_exception('Invalid cache plugin specified. The plugin does not contain the required class.');
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}
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}
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$reflection = new ReflectionClass($class);
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if (!$reflection->isSubclassOf('cache_store')) {
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throw new cache_exception('Invalid cache plugin specified. The plugin does not extend the required class.');
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}
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if (!$class::are_requirements_met()) {
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throw new cache_exception('Unable to add new cache plugin instance. The requested plugin type is not supported.');
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}
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$this->configstores[$name] = array(
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'name' => $name,
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'plugin' => $plugin,
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'configuration' => $configuration,
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'features' => $class::get_supported_features($configuration),
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'modes' => $class::get_supported_modes($configuration),
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'mappingsonly' => !empty($configuration['mappingsonly']),
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'class' => $class,
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'default' => false
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);
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if (array_key_exists('lock', $configuration)) {
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$this->configstores[$name]['lock'] = $configuration['lock'];
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unset($this->configstores[$name]['configuration']['lock']);
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}
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// Call instance_created()
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$store = new $class($name, $this->configstores[$name]['configuration']);
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$store->instance_created();
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$this->config_save();
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return true;
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}
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/**
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* Adds a new lock instance to the config file.
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*
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* @param string $name The name the user gave the instance. PARAM_ALHPANUMEXT
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* @param string $plugin The plugin we are creating an instance of.
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* @param string $configuration Configuration data from the config instance.
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* @throws cache_exception
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*/
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public function add_lock_instance($name, $plugin, $configuration = array()) {
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if (array_key_exists($name, $this->configlocks)) {
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throw new cache_exception('Duplicate name specificed for cache lock instance. You must provide a unique name.');
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}
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$class = 'cachelock_'.$plugin;
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if (!class_exists($class)) {
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$plugins = core_component::get_plugin_list_with_file('cachelock', 'lib.php');
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if (!array_key_exists($plugin, $plugins)) {
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throw new cache_exception('Invalid lock name specified. The plugin does not exist or is not valid.');
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}
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$file = $plugins[$plugin];
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if (file_exists($file)) {
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require_once($file);
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}
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if (!class_exists($class)) {
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throw new cache_exception('Invalid lock plugin specified. The plugin does not contain the required class.');
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}
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}
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$reflection = new ReflectionClass($class);
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if (!$reflection->implementsInterface('cache_lock_interface')) {
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throw new cache_exception('Invalid lock plugin specified. The plugin does not implement the required interface.');
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}
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$this->configlocks[$name] = array_merge($configuration, array(
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'name' => $name,
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'type' => 'cachelock_'.$plugin,
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'default' => false
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));
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$this->config_save();
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}
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/**
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* Deletes a lock instance given its name.
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*
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* @param string $name The name of the plugin, PARAM_ALPHANUMEXT.
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* @return bool
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* @throws cache_exception
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*/
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public function delete_lock_instance($name) {
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if (!array_key_exists($name, $this->configlocks)) {
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throw new cache_exception('The requested store does not exist.');
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}
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if ($this->configlocks[$name]['default']) {
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throw new cache_exception('You can not delete the default lock.');
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}
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foreach ($this->configstores as $store) {
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if (isset($store['lock']) && $store['lock'] === $name) {
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throw new cache_exception('You cannot delete a cache lock that is being used by a store.');
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}
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}
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unset($this->configlocks[$name]);
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$this->config_save();
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return true;
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}
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/**
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* Sets the mode mappings.
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*
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* These determine the default caches for the different modes.
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* This function also calls save so you should redirect immediately, or at least very shortly after
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* calling this method.
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*
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* @param array $modemappings
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* @return bool
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* @throws cache_exception
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*/
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public function set_mode_mappings(array $modemappings) {
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$mappings = array(
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cache_store::MODE_APPLICATION => array(),
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cache_store::MODE_SESSION => array(),
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cache_store::MODE_REQUEST => array(),
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);
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foreach ($modemappings as $mode => $stores) {
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if (!array_key_exists($mode, $mappings)) {
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throw new cache_exception('The cache mode for the new mapping does not exist');
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}
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$sort = 0;
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foreach ($stores as $store) {
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if (!array_key_exists($store, $this->configstores)) {
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throw new cache_exception('The instance name for the new mapping does not exist');
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}
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if (array_key_exists($store, $mappings[$mode])) {
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throw new cache_exception('This cache mapping already exists');
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}
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$mappings[$mode][] = array(
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'store' => $store,
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'mode' => $mode,
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'sort' => $sort++
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);
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}
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}
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$this->configmodemappings = array_merge(
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$mappings[cache_store::MODE_APPLICATION],
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$mappings[cache_store::MODE_SESSION],
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$mappings[cache_store::MODE_REQUEST]
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);
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$this->config_save();
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return true;
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}
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/**
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* Edits a give plugin instance.
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*
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* The plugin instance is determined by its name, hence you cannot rename plugins.
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* This function also calls save so you should redirect immediately, or at least very shortly after
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* calling this method.
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*
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* @param string $name
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* @param string $plugin
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* @param array $configuration
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* @return bool
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* @throws cache_exception
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*/
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public function edit_store_instance($name, $plugin, $configuration) {
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if (!array_key_exists($name, $this->configstores)) {
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throw new cache_exception('The requested instance does not exist.');
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}
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$plugins = core_component::get_plugin_list_with_file('cachestore', 'lib.php');
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if (!array_key_exists($plugin, $plugins)) {
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throw new cache_exception('Invalid plugin name specified. The plugin either does not exist or is not valid.');
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}
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$class = 'cachestore_'.$plugin;
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$file = $plugins[$plugin];
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if (!class_exists($class)) {
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if (file_exists($file)) {
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require_once($file);
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}
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if (!class_exists($class)) {
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throw new cache_exception('Invalid cache plugin specified. The plugin does not contain the required class.'.$class);
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}
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}
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$this->configstores[$name] = array(
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'name' => $name,
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'plugin' => $plugin,
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'configuration' => $configuration,
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'features' => $class::get_supported_features($configuration),
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'modes' => $class::get_supported_modes($configuration),
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'mappingsonly' => !empty($configuration['mappingsonly']),
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'class' => $class,
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'default' => $this->configstores[$name]['default'] // Can't change the default.
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);
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if (array_key_exists('lock', $configuration)) {
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$this->configstores[$name]['lock'] = $configuration['lock'];
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unset($this->configstores[$name]['configuration']['lock']);
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}
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$this->config_save();
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return true;
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}
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/**
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* Deletes a store instance.
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*
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* This function also calls save so you should redirect immediately, or at least very shortly after
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* calling this method.
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*
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* @param string $name The name of the instance to delete.
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* @return bool
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* @throws cache_exception
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*/
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public function delete_store_instance($name) {
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if (!array_key_exists($name, $this->configstores)) {
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throw new cache_exception('The requested store does not exist.');
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}
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if ($this->configstores[$name]['default']) {
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throw new cache_exception('The can not delete the default stores.');
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}
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foreach ($this->configmodemappings as $mapping) {
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if ($mapping['store'] === $name) {
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throw new cache_exception('You cannot delete a cache store that has mode mappings.');
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}
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}
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foreach ($this->configdefinitionmappings as $mapping) {
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if ($mapping['store'] === $name) {
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throw new cache_exception('You cannot delete a cache store that has definition mappings.');
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}
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}
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// Call instance_deleted()
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$class = 'cachestore_'.$this->configstores[$name]['plugin'];
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$store = new $class($name, $this->configstores[$name]['configuration']);
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$store->instance_deleted();
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unset($this->configstores[$name]);
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$this->config_save();
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return true;
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}
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/**
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* Creates the default configuration and saves it.
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*
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* This function calls config_save, however it is safe to continue using it afterwards as this function should only ever
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* be called when there is no configuration file already.
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*
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* @param bool $forcesave If set to true then we will forcefully save the default configuration file.
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* @return true|array Returns true if the default configuration was successfully created.
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* Returns a configuration array if it could not be saved. This is a bad situation. Check your error logs.
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*/
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public static function create_default_configuration($forcesave = false) {
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// HACK ALERT.
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// We probably need to come up with a better way to create the default stores, or at least ensure 100% that the
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// default store plugins are protected from deletion.
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$writer = new self;
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$writer->configstores = self::get_default_stores();
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$writer->configdefinitions = self::locate_definitions();
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$writer->configmodemappings = array(
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array(
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'mode' => cache_store::MODE_APPLICATION,
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'store' => 'default_application',
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'sort' => -1
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),
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array(
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'mode' => cache_store::MODE_SESSION,
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'store' => 'default_session',
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'sort' => -1
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),
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array(
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'mode' => cache_store::MODE_REQUEST,
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'store' => 'default_request',
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'sort' => -1
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)
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);
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$writer->configlocks = array(
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'default_file_lock' => array(
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'name' => 'cachelock_file_default',
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'type' => 'cachelock_file',
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'dir' => 'filelocks',
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'default' => true
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)
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);
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$factory = cache_factory::instance();
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// We expect the cache to be initialising presently. If its not then something has gone wrong and likely
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// we are now in a loop.
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if (!$forcesave && $factory->get_state() !== cache_factory::STATE_INITIALISING) {
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return $writer->generate_configuration_array();
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}
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$factory->set_state(cache_factory::STATE_SAVING);
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$writer->config_save();
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return true;
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}
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/**
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* Returns an array of default stores for use.
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*
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* @return array
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*/
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protected static function get_default_stores() {
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global $CFG;
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require_once($CFG->dirroot.'/cache/stores/file/lib.php');
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require_once($CFG->dirroot.'/cache/stores/session/lib.php');
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require_once($CFG->dirroot.'/cache/stores/static/lib.php');
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return array(
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'default_application' => array(
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'name' => 'default_application',
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'plugin' => 'file',
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'configuration' => array(),
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'features' => cachestore_file::get_supported_features(),
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'modes' => cachestore_file::get_supported_modes(),
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'default' => true,
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),
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'default_session' => array(
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'name' => 'default_session',
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'plugin' => 'session',
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'configuration' => array(),
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'features' => cachestore_session::get_supported_features(),
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'modes' => cachestore_session::get_supported_modes(),
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'default' => true,
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),
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'default_request' => array(
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'name' => 'default_request',
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'plugin' => 'static',
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'configuration' => array(),
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'features' => cachestore_static::get_supported_features(),
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'modes' => cachestore_static::get_supported_modes(),
|
|
'default' => true,
|
|
)
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Updates the default stores within the MUC config file.
|
|
*/
|
|
public static function update_default_config_stores() {
|
|
$factory = cache_factory::instance();
|
|
$factory->updating_started();
|
|
$config = $factory->create_config_instance(true);
|
|
$config->configstores = array_merge($config->configstores, self::get_default_stores());
|
|
$config->config_save();
|
|
$factory->updating_finished();
|
|
}
|
|
|
|
/**
|
|
* Updates the definition in the configuration from those found in the cache files.
|
|
*
|
|
* Calls config_save further down, you should redirect immediately or asap after calling this method.
|
|
*
|
|
* @param bool $coreonly If set to true only core definitions will be updated.
|
|
*/
|
|
public static function update_definitions($coreonly = false) {
|
|
$factory = cache_factory::instance();
|
|
$factory->updating_started();
|
|
$config = $factory->create_config_instance(true);
|
|
$config->write_definitions_to_cache(self::locate_definitions($coreonly));
|
|
$factory->updating_finished();
|
|
}
|
|
|
|
/**
|
|
* Locates all of the definition files.
|
|
*
|
|
* @param bool $coreonly If set to true only core definitions will be updated.
|
|
* @return array
|
|
*/
|
|
protected static function locate_definitions($coreonly = false) {
|
|
global $CFG;
|
|
|
|
$files = array();
|
|
if (file_exists($CFG->dirroot.'/lib/db/caches.php')) {
|
|
$files['core'] = $CFG->dirroot.'/lib/db/caches.php';
|
|
}
|
|
|
|
if (!$coreonly) {
|
|
$plugintypes = core_component::get_plugin_types();
|
|
foreach ($plugintypes as $type => $location) {
|
|
$plugins = core_component::get_plugin_list_with_file($type, 'db/caches.php');
|
|
foreach ($plugins as $plugin => $filepath) {
|
|
$component = clean_param($type.'_'.$plugin, PARAM_COMPONENT); // Standardised plugin name.
|
|
$files[$component] = $filepath;
|
|
}
|
|
}
|
|
}
|
|
|
|
$definitions = array();
|
|
foreach ($files as $component => $file) {
|
|
$filedefs = self::load_caches_file($file);
|
|
foreach ($filedefs as $area => $definition) {
|
|
$area = clean_param($area, PARAM_AREA);
|
|
$id = $component.'/'.$area;
|
|
$definition['component'] = $component;
|
|
$definition['area'] = $area;
|
|
if (array_key_exists($id, $definitions)) {
|
|
debugging('Error: duplicate cache definition found with id: '.$id, DEBUG_DEVELOPER);
|
|
continue;
|
|
}
|
|
$definitions[$id] = $definition;
|
|
}
|
|
}
|
|
|
|
return $definitions;
|
|
}
|
|
|
|
/**
|
|
* Writes the updated definitions for the config file.
|
|
* @param array $definitions
|
|
*/
|
|
private function write_definitions_to_cache(array $definitions) {
|
|
|
|
// Preserve the selected sharing option when updating the definitions.
|
|
// This is set by the user and should never come from caches.php.
|
|
foreach ($definitions as $key => $definition) {
|
|
unset($definitions[$key]['selectedsharingoption']);
|
|
unset($definitions[$key]['userinputsharingkey']);
|
|
if (isset($this->configdefinitions[$key]) && isset($this->configdefinitions[$key]['selectedsharingoption'])) {
|
|
$definitions[$key]['selectedsharingoption'] = $this->configdefinitions[$key]['selectedsharingoption'];
|
|
}
|
|
if (isset($this->configdefinitions[$key]) && isset($this->configdefinitions[$key]['userinputsharingkey'])) {
|
|
$definitions[$key]['userinputsharingkey'] = $this->configdefinitions[$key]['userinputsharingkey'];
|
|
}
|
|
}
|
|
|
|
$this->configdefinitions = $definitions;
|
|
foreach ($this->configdefinitionmappings as $key => $mapping) {
|
|
if (!array_key_exists($mapping['definition'], $definitions)) {
|
|
unset($this->configdefinitionmappings[$key]);
|
|
}
|
|
}
|
|
$this->config_save();
|
|
}
|
|
|
|
/**
|
|
* Loads the caches file if it exists.
|
|
* @param string $file Absolute path to the file.
|
|
* @return array
|
|
*/
|
|
private static function load_caches_file($file) {
|
|
if (!file_exists($file)) {
|
|
return array();
|
|
}
|
|
$definitions = array();
|
|
include($file);
|
|
return $definitions;
|
|
}
|
|
|
|
/**
|
|
* Sets the mappings for a given definition.
|
|
*
|
|
* @param string $definition
|
|
* @param array $mappings
|
|
* @throws coding_exception
|
|
*/
|
|
public function set_definition_mappings($definition, $mappings) {
|
|
if (!array_key_exists($definition, $this->configdefinitions)) {
|
|
throw new coding_exception('Invalid definition name passed when updating mappings.');
|
|
}
|
|
foreach ($mappings as $store) {
|
|
if (!array_key_exists($store, $this->configstores)) {
|
|
throw new coding_exception('Invalid store name passed when updating definition mappings.');
|
|
}
|
|
}
|
|
foreach ($this->configdefinitionmappings as $key => $mapping) {
|
|
if ($mapping['definition'] == $definition) {
|
|
unset($this->configdefinitionmappings[$key]);
|
|
}
|
|
}
|
|
$sort = count($mappings);
|
|
foreach ($mappings as $store) {
|
|
$this->configdefinitionmappings[] = array(
|
|
'store' => $store,
|
|
'definition' => $definition,
|
|
'sort' => $sort
|
|
);
|
|
$sort--;
|
|
}
|
|
|
|
$this->config_save();
|
|
}
|
|
|
|
/**
|
|
* Update the site identifier stored by the cache API.
|
|
*
|
|
* @param string $siteidentifier
|
|
* @return string The new site identifier.
|
|
*/
|
|
public function update_site_identifier($siteidentifier) {
|
|
$this->siteidentifier = md5((string)$siteidentifier);
|
|
$this->config_save();
|
|
return $this->siteidentifier;
|
|
}
|
|
|
|
/**
|
|
* Sets the selected sharing options and key for a definition.
|
|
*
|
|
* @param string $definition The name of the definition to set for.
|
|
* @param int $sharingoption The sharing option to set.
|
|
* @param string|null $userinputsharingkey The user input key or null.
|
|
* @throws coding_exception
|
|
*/
|
|
public function set_definition_sharing($definition, $sharingoption, $userinputsharingkey = null) {
|
|
if (!array_key_exists($definition, $this->configdefinitions)) {
|
|
throw new coding_exception('Invalid definition name passed when updating sharing options.');
|
|
}
|
|
if (!($this->configdefinitions[$definition]['sharingoptions'] & $sharingoption)) {
|
|
throw new coding_exception('Invalid sharing option passed when updating definition.');
|
|
}
|
|
$this->configdefinitions[$definition]['selectedsharingoption'] = (int)$sharingoption;
|
|
if (!empty($userinputsharingkey)) {
|
|
$this->configdefinitions[$definition]['userinputsharingkey'] = (string)$userinputsharingkey;
|
|
}
|
|
$this->config_save();
|
|
}
|
|
}
|