You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
787 lines
26 KiB
787 lines
26 KiB
<?php
|
|
// This file is part of Moodle - http://moodle.org/
|
|
//
|
|
// Moodle is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// Moodle is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
/**
|
|
* The library file for the file cache store.
|
|
*
|
|
* This file is part of the file cache store, it contains the API for interacting with an instance of the store.
|
|
* This is used as a default cache store within the Cache API. It should never be deleted.
|
|
*
|
|
* @package cachestore_file
|
|
* @category cache
|
|
* @copyright 2012 Sam Hemelryk
|
|
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
|
|
*/
|
|
|
|
/**
|
|
* The file store class.
|
|
*
|
|
* Configuration options
|
|
* path: string: path to the cache directory, if left empty one will be created in the cache directory
|
|
* autocreate: true, false
|
|
* prescan: true, false
|
|
*
|
|
* @copyright 2012 Sam Hemelryk
|
|
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
|
|
*/
|
|
class cachestore_file extends cache_store implements cache_is_key_aware, cache_is_configurable, cache_is_searchable {
|
|
|
|
/**
|
|
* The name of the store.
|
|
* @var string
|
|
*/
|
|
protected $name;
|
|
|
|
/**
|
|
* The path used to store files for this store and the definition it was initialised with.
|
|
* @var string
|
|
*/
|
|
protected $path = false;
|
|
|
|
/**
|
|
* The path in which definition specific sub directories will be created for caching.
|
|
* @var string
|
|
*/
|
|
protected $filestorepath = false;
|
|
|
|
/**
|
|
* Set to true when a prescan has been performed.
|
|
* @var bool
|
|
*/
|
|
protected $prescan = false;
|
|
|
|
/**
|
|
* Set to true if we should store files within a single directory.
|
|
* By default we use a nested structure in order to reduce the chance of conflicts and avoid any file system
|
|
* limitations such as maximum files per directory.
|
|
* @var bool
|
|
*/
|
|
protected $singledirectory = false;
|
|
|
|
/**
|
|
* Set to true when the path should be automatically created if it does not yet exist.
|
|
* @var bool
|
|
*/
|
|
protected $autocreate = false;
|
|
|
|
/**
|
|
* Set to true if a custom path is being used.
|
|
* @var bool
|
|
*/
|
|
protected $custompath = false;
|
|
|
|
/**
|
|
* An array of keys we are sure about presently.
|
|
* @var array
|
|
*/
|
|
protected $keys = array();
|
|
|
|
/**
|
|
* True when the store is ready to be initialised.
|
|
* @var bool
|
|
*/
|
|
protected $isready = false;
|
|
|
|
/**
|
|
* The cache definition this instance has been initialised with.
|
|
* @var cache_definition
|
|
*/
|
|
protected $definition;
|
|
|
|
/**
|
|
* A reference to the global $CFG object.
|
|
*
|
|
* You may be asking yourself why on earth this is here, but there is a good reason.
|
|
* By holding onto a reference of the $CFG object we can be absolutely sure that it won't be destroyed before
|
|
* we are done with it.
|
|
* This makes it possible to use a cache within a destructor method for the purposes of
|
|
* delayed writes. Like how the session mechanisms work.
|
|
*
|
|
* @var stdClass
|
|
*/
|
|
private $cfg = null;
|
|
|
|
/**
|
|
* Constructs the store instance.
|
|
*
|
|
* Noting that this function is not an initialisation. It is used to prepare the store for use.
|
|
* The store will be initialised when required and will be provided with a cache_definition at that time.
|
|
*
|
|
* @param string $name
|
|
* @param array $configuration
|
|
*/
|
|
public function __construct($name, array $configuration = array()) {
|
|
global $CFG;
|
|
|
|
if (isset($CFG)) {
|
|
// Hold onto a reference of the global $CFG object.
|
|
$this->cfg = $CFG;
|
|
}
|
|
|
|
$this->name = $name;
|
|
if (array_key_exists('path', $configuration) && $configuration['path'] !== '') {
|
|
$this->custompath = true;
|
|
$this->autocreate = !empty($configuration['autocreate']);
|
|
$path = (string)$configuration['path'];
|
|
if (!is_dir($path)) {
|
|
if ($this->autocreate) {
|
|
if (!make_writable_directory($path, false)) {
|
|
$path = false;
|
|
debugging('Error trying to autocreate file store path. '.$path, DEBUG_DEVELOPER);
|
|
}
|
|
} else {
|
|
$path = false;
|
|
debugging('The given file cache store path does not exist. '.$path, DEBUG_DEVELOPER);
|
|
}
|
|
}
|
|
if ($path !== false && !is_writable($path)) {
|
|
$path = false;
|
|
debugging('The file cache store path is not writable for `'.$name.'`', DEBUG_DEVELOPER);
|
|
}
|
|
} else {
|
|
$path = make_cache_directory('cachestore_file/'.preg_replace('#[^a-zA-Z0-9\.\-_]+#', '', $name));
|
|
}
|
|
$this->isready = $path !== false;
|
|
$this->filestorepath = $path;
|
|
// This will be updated once the store has been initialised for a definition.
|
|
$this->path = $path;
|
|
|
|
// Check if we should prescan the directory.
|
|
if (array_key_exists('prescan', $configuration)) {
|
|
$this->prescan = (bool)$configuration['prescan'];
|
|
} else {
|
|
// Default is no, we should not prescan.
|
|
$this->prescan = false;
|
|
}
|
|
// Check if we should be storing in a single directory.
|
|
if (array_key_exists('singledirectory', $configuration)) {
|
|
$this->singledirectory = (bool)$configuration['singledirectory'];
|
|
} else {
|
|
// Default: No, we will use multiple directories.
|
|
$this->singledirectory = false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Performs any necessary operation when the file store instance has been created.
|
|
*/
|
|
public function instance_created() {
|
|
if ($this->isready && !$this->prescan) {
|
|
// It is supposed the store instance to expect an empty folder.
|
|
$this->purge_all_definitions();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns true if this store instance is ready to be used.
|
|
* @return bool
|
|
*/
|
|
public function is_ready() {
|
|
return $this->isready;
|
|
}
|
|
|
|
/**
|
|
* Returns true once this instance has been initialised.
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function is_initialised() {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Returns the supported features as a combined int.
|
|
*
|
|
* @param array $configuration
|
|
* @return int
|
|
*/
|
|
public static function get_supported_features(array $configuration = array()) {
|
|
$supported = self::SUPPORTS_DATA_GUARANTEE +
|
|
self::SUPPORTS_NATIVE_TTL +
|
|
self::IS_SEARCHABLE +
|
|
self::DEREFERENCES_OBJECTS;
|
|
return $supported;
|
|
}
|
|
|
|
/**
|
|
* Returns false as this store does not support multiple identifiers.
|
|
* (This optional function is a performance optimisation; it must be
|
|
* consistent with the value from get_supported_features.)
|
|
*
|
|
* @return bool False
|
|
*/
|
|
public function supports_multiple_identifiers() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns the supported modes as a combined int.
|
|
*
|
|
* @param array $configuration
|
|
* @return int
|
|
*/
|
|
public static function get_supported_modes(array $configuration = array()) {
|
|
return self::MODE_APPLICATION + self::MODE_SESSION;
|
|
}
|
|
|
|
/**
|
|
* Returns true if the store requirements are met.
|
|
*
|
|
* @return bool
|
|
*/
|
|
public static function are_requirements_met() {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Returns true if the given mode is supported by this store.
|
|
*
|
|
* @param int $mode One of cache_store::MODE_*
|
|
* @return bool
|
|
*/
|
|
public static function is_supported_mode($mode) {
|
|
return ($mode === self::MODE_APPLICATION || $mode === self::MODE_SESSION);
|
|
}
|
|
|
|
/**
|
|
* Initialises the cache.
|
|
*
|
|
* Once this has been done the cache is all set to be used.
|
|
*
|
|
* @param cache_definition $definition
|
|
*/
|
|
public function initialise(cache_definition $definition) {
|
|
$this->definition = $definition;
|
|
$hash = preg_replace('#[^a-zA-Z0-9]+#', '_', $this->definition->get_id());
|
|
$this->path = $this->filestorepath.'/'.$hash;
|
|
make_writable_directory($this->path, false);
|
|
if ($this->prescan && $definition->get_mode() !== self::MODE_REQUEST) {
|
|
$this->prescan = false;
|
|
}
|
|
if ($this->prescan) {
|
|
$this->prescan_keys();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Pre-scan the cache to see which keys are present.
|
|
*/
|
|
protected function prescan_keys() {
|
|
$files = glob($this->glob_keys_pattern(), GLOB_MARK | GLOB_NOSORT);
|
|
if (is_array($files)) {
|
|
foreach ($files as $filename) {
|
|
$this->keys[basename($filename)] = filemtime($filename);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets a pattern suitable for use with glob to find all keys in the cache.
|
|
*
|
|
* @param string $prefix A prefix to use.
|
|
* @return string The pattern.
|
|
*/
|
|
protected function glob_keys_pattern($prefix = '') {
|
|
if ($this->singledirectory) {
|
|
return $this->path . '/'.$prefix.'*.cache';
|
|
} else {
|
|
return $this->path . '/*/'.$prefix.'*.cache';
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the file path to use for the given key.
|
|
*
|
|
* @param string $key The key to generate a file path for.
|
|
* @param bool $create If set to the true the directory structure the key requires will be created.
|
|
* @return string The full path to the file that stores a particular cache key.
|
|
*/
|
|
protected function file_path_for_key($key, $create = false) {
|
|
if ($this->singledirectory) {
|
|
// Its a single directory, easy, just the store instances path + the file name.
|
|
return $this->path . '/' . $key . '.cache';
|
|
} else {
|
|
// We are using a single subdirectory to achieve 1 level.
|
|
// We suffix the subdir so it does not clash with any windows
|
|
// reserved filenames like 'con'.
|
|
$subdir = substr($key, 0, 3) . '-cache';
|
|
$dir = $this->path . '/' . $subdir;
|
|
if ($create) {
|
|
// Create the directory. This function does it recursivily!
|
|
make_writable_directory($dir, false);
|
|
}
|
|
return $dir . '/' . $key . '.cache';
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Retrieves an item from the cache store given its key.
|
|
*
|
|
* @param string $key The key to retrieve
|
|
* @return mixed The data that was associated with the key, or false if the key did not exist.
|
|
*/
|
|
public function get($key) {
|
|
$filename = $key.'.cache';
|
|
$file = $this->file_path_for_key($key);
|
|
$ttl = $this->definition->get_ttl();
|
|
$maxtime = 0;
|
|
if ($ttl) {
|
|
$maxtime = cache::now() - $ttl;
|
|
}
|
|
$readfile = false;
|
|
if ($this->prescan && array_key_exists($filename, $this->keys)) {
|
|
if ((!$ttl || $this->keys[$filename] >= $maxtime) && file_exists($file)) {
|
|
$readfile = true;
|
|
} else {
|
|
$this->delete($key);
|
|
}
|
|
} else if (file_exists($file) && (!$ttl || filemtime($file) >= $maxtime)) {
|
|
$readfile = true;
|
|
}
|
|
if (!$readfile) {
|
|
return false;
|
|
}
|
|
// Open ensuring the file for reading in binary format.
|
|
if (!$handle = fopen($file, 'rb')) {
|
|
return false;
|
|
}
|
|
// Lock it up!
|
|
// We don't care if this succeeds or not, on some systems it will, on some it won't, meah either way.
|
|
flock($handle, LOCK_SH);
|
|
$data = '';
|
|
// Read the data in 1Mb chunks. Small caches will not loop more than once. We don't use filesize as it may
|
|
// be cached with a different value than what we need to read from the file.
|
|
do {
|
|
$data .= fread($handle, 1048576);
|
|
} while (!feof($handle));
|
|
// Unlock it.
|
|
flock($handle, LOCK_UN);
|
|
// Return it unserialised.
|
|
return $this->prep_data_after_read($data);
|
|
}
|
|
|
|
/**
|
|
* Retrieves several items from the cache store in a single transaction.
|
|
*
|
|
* If not all of the items are available in the cache then the data value for those that are missing will be set to false.
|
|
*
|
|
* @param array $keys The array of keys to retrieve
|
|
* @return array An array of items from the cache. There will be an item for each key, those that were not in the store will
|
|
* be set to false.
|
|
*/
|
|
public function get_many($keys) {
|
|
$result = array();
|
|
foreach ($keys as $key) {
|
|
$result[$key] = $this->get($key);
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Deletes an item from the cache store.
|
|
*
|
|
* @param string $key The key to delete.
|
|
* @return bool Returns true if the operation was a success, false otherwise.
|
|
*/
|
|
public function delete($key) {
|
|
$filename = $key.'.cache';
|
|
$file = $this->file_path_for_key($key);
|
|
if (@unlink($file)) {
|
|
unset($this->keys[$filename]);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Deletes several keys from the cache in a single action.
|
|
*
|
|
* @param array $keys The keys to delete
|
|
* @return int The number of items successfully deleted.
|
|
*/
|
|
public function delete_many(array $keys) {
|
|
$count = 0;
|
|
foreach ($keys as $key) {
|
|
if ($this->delete($key)) {
|
|
$count++;
|
|
}
|
|
}
|
|
return $count;
|
|
}
|
|
|
|
/**
|
|
* Sets an item in the cache given its key and data value.
|
|
*
|
|
* @param string $key The key to use.
|
|
* @param mixed $data The data to set.
|
|
* @return bool True if the operation was a success false otherwise.
|
|
*/
|
|
public function set($key, $data) {
|
|
$this->ensure_path_exists();
|
|
$filename = $key.'.cache';
|
|
$file = $this->file_path_for_key($key, true);
|
|
$result = $this->write_file($file, $this->prep_data_before_save($data));
|
|
if (!$result) {
|
|
// Couldn't write the file.
|
|
return false;
|
|
}
|
|
// Record the key if required.
|
|
if ($this->prescan) {
|
|
$this->keys[$filename] = cache::now() + 1;
|
|
}
|
|
// Return true.. it all worked **miracles**.
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Prepares data to be stored in a file.
|
|
*
|
|
* @param mixed $data
|
|
* @return string
|
|
*/
|
|
protected function prep_data_before_save($data) {
|
|
return serialize($data);
|
|
}
|
|
|
|
/**
|
|
* Prepares the data it has been read from the cache. Undoing what was done in prep_data_before_save.
|
|
*
|
|
* @param string $data
|
|
* @return mixed
|
|
* @throws coding_exception
|
|
*/
|
|
protected function prep_data_after_read($data) {
|
|
$result = @unserialize($data);
|
|
if ($result === false) {
|
|
throw new coding_exception('Failed to unserialise data from file. Either failed to read, or failed to write.');
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Sets many items in the cache in a single transaction.
|
|
*
|
|
* @param array $keyvaluearray An array of key value pairs. Each item in the array will be an associative array with two
|
|
* keys, 'key' and 'value'.
|
|
* @return int The number of items successfully set. It is up to the developer to check this matches the number of items
|
|
* sent ... if they care that is.
|
|
*/
|
|
public function set_many(array $keyvaluearray) {
|
|
$count = 0;
|
|
foreach ($keyvaluearray as $pair) {
|
|
if ($this->set($pair['key'], $pair['value'])) {
|
|
$count++;
|
|
}
|
|
}
|
|
return $count;
|
|
}
|
|
|
|
/**
|
|
* Checks if the store has a record for the given key and returns true if so.
|
|
*
|
|
* @param string $key
|
|
* @return bool
|
|
*/
|
|
public function has($key) {
|
|
$filename = $key.'.cache';
|
|
$maxtime = cache::now() - $this->definition->get_ttl();
|
|
if ($this->prescan) {
|
|
return array_key_exists($filename, $this->keys) && $this->keys[$filename] >= $maxtime;
|
|
}
|
|
$file = $this->file_path_for_key($key);
|
|
return (file_exists($file) && ($this->definition->get_ttl() == 0 || filemtime($file) >= $maxtime));
|
|
}
|
|
|
|
/**
|
|
* Returns true if the store contains records for all of the given keys.
|
|
*
|
|
* @param array $keys
|
|
* @return bool
|
|
*/
|
|
public function has_all(array $keys) {
|
|
foreach ($keys as $key) {
|
|
if (!$this->has($key)) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Returns true if the store contains records for any of the given keys.
|
|
*
|
|
* @param array $keys
|
|
* @return bool
|
|
*/
|
|
public function has_any(array $keys) {
|
|
foreach ($keys as $key) {
|
|
if ($this->has($key)) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Purges the cache definition deleting all the items within it.
|
|
*
|
|
* @return boolean True on success. False otherwise.
|
|
*/
|
|
public function purge() {
|
|
if ($this->isready) {
|
|
$files = glob($this->glob_keys_pattern(), GLOB_MARK | GLOB_NOSORT);
|
|
if (is_array($files)) {
|
|
foreach ($files as $filename) {
|
|
@unlink($filename);
|
|
}
|
|
}
|
|
$this->keys = array();
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Purges all the cache definitions deleting all items within them.
|
|
*
|
|
* @return boolean True on success. False otherwise.
|
|
*/
|
|
protected function purge_all_definitions() {
|
|
// Warning: limit the deletion to what file store is actually able
|
|
// to create using the internal {@link purge()} providing the
|
|
// {@link $path} with a wildcard to perform a purge action over all the definitions.
|
|
$currpath = $this->path;
|
|
$this->path = $this->filestorepath.'/*';
|
|
$result = $this->purge();
|
|
$this->path = $currpath;
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Given the data from the add instance form this function creates a configuration array.
|
|
*
|
|
* @param stdClass $data
|
|
* @return array
|
|
*/
|
|
public static function config_get_configuration_array($data) {
|
|
$config = array();
|
|
|
|
if (isset($data->path)) {
|
|
$config['path'] = $data->path;
|
|
}
|
|
if (isset($data->autocreate)) {
|
|
$config['autocreate'] = $data->autocreate;
|
|
}
|
|
if (isset($data->singledirectory)) {
|
|
$config['singledirectory'] = $data->singledirectory;
|
|
}
|
|
if (isset($data->prescan)) {
|
|
$config['prescan'] = $data->prescan;
|
|
}
|
|
|
|
return $config;
|
|
}
|
|
|
|
/**
|
|
* Allows the cache store to set its data against the edit form before it is shown to the user.
|
|
*
|
|
* @param moodleform $editform
|
|
* @param array $config
|
|
*/
|
|
public static function config_set_edit_form_data(moodleform $editform, array $config) {
|
|
$data = array();
|
|
if (!empty($config['path'])) {
|
|
$data['path'] = $config['path'];
|
|
}
|
|
if (isset($config['autocreate'])) {
|
|
$data['autocreate'] = (bool)$config['autocreate'];
|
|
}
|
|
if (isset($config['singledirectory'])) {
|
|
$data['singledirectory'] = (bool)$config['singledirectory'];
|
|
}
|
|
if (isset($config['prescan'])) {
|
|
$data['prescan'] = (bool)$config['prescan'];
|
|
}
|
|
$editform->set_data($data);
|
|
}
|
|
|
|
/**
|
|
* Checks to make sure that the path for the file cache exists.
|
|
*
|
|
* @return bool
|
|
* @throws coding_exception
|
|
*/
|
|
protected function ensure_path_exists() {
|
|
global $CFG;
|
|
if (!is_writable($this->path)) {
|
|
if ($this->custompath && !$this->autocreate) {
|
|
throw new coding_exception('File store path does not exist. It must exist and be writable by the web server.');
|
|
}
|
|
$createdcfg = false;
|
|
if (!isset($CFG)) {
|
|
// This can only happen during destruction of objects.
|
|
// A cache is being used within a destructor, php is ending a request and $CFG has
|
|
// already being cleaned up.
|
|
// Rebuild $CFG with directory permissions just to complete this write.
|
|
$CFG = $this->cfg;
|
|
$createdcfg = true;
|
|
}
|
|
if (!make_writable_directory($this->path, false)) {
|
|
throw new coding_exception('File store path does not exist and can not be created.');
|
|
}
|
|
if ($createdcfg) {
|
|
// We re-created it so we'll clean it up.
|
|
unset($CFG);
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Performs any necessary clean up when the file store instance is being deleted.
|
|
*
|
|
* 1. Purges the cache directory.
|
|
* 2. Deletes the directory we created for the given definition.
|
|
*/
|
|
public function instance_deleted() {
|
|
$this->purge_all_definitions();
|
|
@rmdir($this->filestorepath);
|
|
}
|
|
|
|
/**
|
|
* Generates an instance of the cache store that can be used for testing.
|
|
*
|
|
* Returns an instance of the cache store, or false if one cannot be created.
|
|
*
|
|
* @param cache_definition $definition
|
|
* @return cachestore_file
|
|
*/
|
|
public static function initialise_test_instance(cache_definition $definition) {
|
|
$name = 'File test';
|
|
$path = make_cache_directory('cachestore_file_test');
|
|
$cache = new cachestore_file($name, array('path' => $path));
|
|
if ($cache->is_ready()) {
|
|
$cache->initialise($definition);
|
|
}
|
|
return $cache;
|
|
}
|
|
|
|
/**
|
|
* Generates the appropriate configuration required for unit testing.
|
|
*
|
|
* @return array Array of unit test configuration data to be used by initialise().
|
|
*/
|
|
public static function unit_test_configuration() {
|
|
return array();
|
|
}
|
|
|
|
/**
|
|
* Writes your madness to a file.
|
|
*
|
|
* There are several things going on in this function to try to ensure what we don't end up with partial writes etc.
|
|
* 1. Files for writing are opened with the mode xb, the file must be created and can not already exist.
|
|
* 2. Renaming, data is written to a temporary file, where it can be verified using md5 and is then renamed.
|
|
*
|
|
* @param string $file Absolute file path
|
|
* @param string $content The content to write.
|
|
* @return bool
|
|
*/
|
|
protected function write_file($file, $content) {
|
|
// Generate a temp file that is going to be unique. We'll rename it at the end to the desired file name.
|
|
// in this way we avoid partial writes.
|
|
$path = dirname($file);
|
|
while (true) {
|
|
$tempfile = $path.'/'.uniqid(sesskey().'.', true) . '.temp';
|
|
if (!file_exists($tempfile)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Open the file with mode=x. This acts to create and open the file for writing only.
|
|
// If the file already exists this will return false.
|
|
// We also force binary.
|
|
$handle = @fopen($tempfile, 'xb+');
|
|
if ($handle === false) {
|
|
// File already exists... lock already exists, return false.
|
|
return false;
|
|
}
|
|
fwrite($handle, $content);
|
|
fflush($handle);
|
|
// Close the handle, we're done.
|
|
fclose($handle);
|
|
|
|
if (md5_file($tempfile) !== md5($content)) {
|
|
// The md5 of the content of the file must match the md5 of the content given to be written.
|
|
@unlink($tempfile);
|
|
return false;
|
|
}
|
|
|
|
// Finally rename the temp file to the desired file, returning the true|false result.
|
|
$result = rename($tempfile, $file);
|
|
@chmod($file, $this->cfg->filepermissions);
|
|
if (!$result) {
|
|
// Failed to rename, don't leave files lying around.
|
|
@unlink($tempfile);
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Returns the name of this instance.
|
|
* @return string
|
|
*/
|
|
public function my_name() {
|
|
return $this->name;
|
|
}
|
|
|
|
/**
|
|
* Finds all of the keys being used by this cache store instance.
|
|
*
|
|
* @return array
|
|
*/
|
|
public function find_all() {
|
|
$this->ensure_path_exists();
|
|
$files = glob($this->glob_keys_pattern(), GLOB_MARK | GLOB_NOSORT);
|
|
$return = array();
|
|
if ($files === false) {
|
|
return $return;
|
|
}
|
|
foreach ($files as $file) {
|
|
$return[] = substr(basename($file), 0, -6);
|
|
}
|
|
return $return;
|
|
}
|
|
|
|
/**
|
|
* Finds all of the keys whose keys start with the given prefix.
|
|
*
|
|
* @param string $prefix
|
|
*/
|
|
public function find_by_prefix($prefix) {
|
|
$this->ensure_path_exists();
|
|
$prefix = preg_replace('#(\*|\?|\[)#', '[$1]', $prefix);
|
|
$files = glob($this->glob_keys_pattern($prefix), GLOB_MARK | GLOB_NOSORT);
|
|
$return = array();
|
|
if ($files === false) {
|
|
return $return;
|
|
}
|
|
foreach ($files as $file) {
|
|
// Trim off ".cache" from the end.
|
|
$return[] = substr(basename($file), 0, -6);
|
|
}
|
|
return $return;
|
|
}
|
|
}
|
|
|