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231
vendor/google/auth/src/Cache/SysVCacheItemPool.php
vendored
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231
vendor/google/auth/src/Cache/SysVCacheItemPool.php
vendored
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<?php
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/**
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* Copyright 2018 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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namespace Google\Auth\Cache;
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use Psr\Cache\CacheItemInterface;
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use Psr\Cache\CacheItemPoolInterface;
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/**
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* SystemV shared memory based CacheItemPool implementation.
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*
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* This CacheItemPool implementation can be used among multiple processes, but
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* it doesn't provide any locking mechanism. If multiple processes write to
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* this ItemPool, you have to avoid race condition manually in your code.
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*/
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class SysVCacheItemPool implements CacheItemPoolInterface
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{
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const VAR_KEY = 1;
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const DEFAULT_PROJ = 'A';
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const DEFAULT_MEMSIZE = 10000;
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const DEFAULT_PERM = 0600;
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/** @var int */
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private $sysvKey;
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/**
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* @var CacheItemInterface[]
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*/
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private $items;
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/**
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* @var CacheItemInterface[]
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*/
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private $deferredItems;
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/**
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* @var array
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*/
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private $options;
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/**
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* Save the current items.
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*
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* @return bool true when success, false upon failure
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*/
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private function saveCurrentItems()
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{
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$shmid = shm_attach(
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$this->sysvKey,
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$this->options['memsize'],
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$this->options['perm']
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);
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if ($shmid !== false) {
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$ret = shm_put_var(
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$shmid,
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$this->options['variableKey'],
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$this->items
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);
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shm_detach($shmid);
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return $ret;
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}
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return false;
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}
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/**
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* Load the items from the shared memory.
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*
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* @return bool true when success, false upon failure
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*/
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private function loadItems()
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{
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$shmid = shm_attach(
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$this->sysvKey,
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$this->options['memsize'],
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$this->options['perm']
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);
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if ($shmid !== false) {
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$data = @shm_get_var($shmid, $this->options['variableKey']);
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if (!empty($data)) {
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$this->items = $data;
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} else {
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$this->items = [];
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}
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shm_detach($shmid);
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return true;
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}
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return false;
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}
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/**
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* Create a SystemV shared memory based CacheItemPool.
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*
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* @param array $options [optional] {
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* Configuration options.
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*
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* @type int $variableKey The variable key for getting the data from
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* the shared memory. **Defaults to** 1.
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* @type string $proj The project identifier for ftok. This needs to
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* be a one character string. **Defaults to** 'A'.
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* @type int $memsize The memory size in bytes for shm_attach.
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* **Defaults to** 10000.
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* @type int $perm The permission for shm_attach. **Defaults to** 0600.
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*/
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public function __construct($options = [])
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{
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if (! extension_loaded('sysvshm')) {
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throw \RuntimeException(
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'sysvshm extension is required to use this ItemPool');
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}
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$this->options = $options + [
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'variableKey' => self::VAR_KEY,
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'proj' => self::DEFAULT_PROJ,
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'memsize' => self::DEFAULT_MEMSIZE,
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'perm' => self::DEFAULT_PERM
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];
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$this->items = [];
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$this->deferredItems = [];
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$this->sysvKey = ftok(__FILE__, $this->options['proj']);
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$this->loadItems();
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}
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/**
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* {@inheritdoc}
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*/
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public function getItem($key)
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{
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$this->loadItems();
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return current($this->getItems([$key]));
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}
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/**
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* {@inheritdoc}
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*/
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public function getItems(array $keys = [])
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{
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$this->loadItems();
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$items = [];
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foreach ($keys as $key) {
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$items[$key] = $this->hasItem($key) ?
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clone $this->items[$key] :
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new Item($key);
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}
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return $items;
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}
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/**
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* {@inheritdoc}
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*/
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public function hasItem($key)
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{
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$this->loadItems();
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return isset($this->items[$key]) && $this->items[$key]->isHit();
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}
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/**
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* {@inheritdoc}
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*/
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public function clear()
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{
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$this->items = [];
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$this->deferredItems = [];
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return $this->saveCurrentItems();
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}
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/**
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* {@inheritdoc}
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*/
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public function deleteItem($key)
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{
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return $this->deleteItems([$key]);
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}
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/**
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* {@inheritdoc}
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*/
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public function deleteItems(array $keys)
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{
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foreach ($keys as $key) {
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unset($this->items[$key]);
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}
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return $this->saveCurrentItems();
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}
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/**
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* {@inheritdoc}
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*/
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public function save(CacheItemInterface $item)
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{
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$this->items[$item->getKey()] = $item;
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return $this->saveCurrentItems();
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}
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/**
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* {@inheritdoc}
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*/
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public function saveDeferred(CacheItemInterface $item)
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{
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$this->deferredItems[$item->getKey()] = $item;
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return true;
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}
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/**
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* {@inheritdoc}
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*/
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public function commit()
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{
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foreach ($this->deferredItems as $item) {
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if ($this->save($item) === false) {
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return false;
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}
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}
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$this->deferredItems = [];
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return true;
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}
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}
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