mirror of https://github.com/MISP/MISP
198 lines
6.7 KiB
PHP
198 lines
6.7 KiB
PHP
<?php
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declare(strict_types=1);
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class ApcuCacheTool implements \Psr\SimpleCache\CacheInterface
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{
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/** @var string */
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private $prefix;
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/**
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* @param string $prefix
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*/
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public function __construct(string $prefix)
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{
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$this->prefix = $prefix;
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}
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/**
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* Fetches a value from the cache.
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*
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* @param string $key The unique key of this item in the cache.
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* @param mixed $default Default value to return if the key does not exist.
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*
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* @return mixed The value of the item from the cache, or $default in case of cache miss.
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*
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* @throws \Psr\SimpleCache\InvalidArgumentException
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* MUST be thrown if the $key string is not a legal value.
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*/
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public function get($key, $default = null)
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{
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$value = \apcu_fetch("$this->prefix:$key", $success);
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if ($success) {
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return $value;
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}
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return $default;
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}
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/**
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* Persists data in the cache, uniquely referenced by a key with an optional expiration TTL time.
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*
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* @param string $key The key of the item to store.
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* @param mixed $value The value of the item to store, must be serializable.
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* @param null|int|\DateInterval $ttl Optional. The TTL value of this item. If no value is sent and
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* the driver supports TTL then the library may set a default value
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* for it or let the driver take care of that.
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*
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* @return bool True on success and false on failure.
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*
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* @throws \Psr\SimpleCache\InvalidArgumentException
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* MUST be thrown if the $key string is not a legal value.
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*/
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public function set($key, $value, $ttl = null)
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{
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return \apcu_store("$this->prefix:$key", $value, $this->tllToInt($ttl));
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}
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/**
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* Delete an item from the cache by its unique key.
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*
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* @param string $key The unique cache key of the item to delete.
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*
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* @return bool True if the item was successfully removed. False if there was an error.
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*
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* @throws \Psr\SimpleCache\InvalidArgumentException
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* MUST be thrown if the $key string is not a legal value.
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*/
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public function delete($key)
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{
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return \apcu_delete("$this->prefix:$key");
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}
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/**
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* Wipes clean the entire cache's keys.
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*
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* @return bool True on success and false on failure.
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*/
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public function clear()
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{
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$iterator = new APCUIterator(
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'/^' . preg_quote($this->prefix . ':', '/') . '/',
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APC_ITER_NONE
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);
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return \apcu_delete($iterator);
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}
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/**
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* Obtains multiple cache items by their unique keys.
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*
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* @param iterable $keys A list of keys that can obtained in a single operation.
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* @param mixed $default Default value to return for keys that do not exist.
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*
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* @return iterable A list of key => value pairs. Cache keys that do not exist or are stale will have $default as value.
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*
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* @throws \Psr\SimpleCache\InvalidArgumentException
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* MUST be thrown if $keys is neither an array nor a Traversable,
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* or if any of the $keys are not a legal value.
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*/
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public function getMultiple($keys, $default = null)
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{
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$keysToFetch = $this->keysToFetch($keys);
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$values = \apcu_fetch($keysToFetch);
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foreach ($keysToFetch as $keyToFetch) {
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if (!isset($values[$keyToFetch])) {
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$values[$keyToFetch] = $default;
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}
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}
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return $values;
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}
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/**
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* Persists a set of key => value pairs in the cache, with an optional TTL.
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*
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* @param iterable $values A list of key => value pairs for a multiple-set operation.
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* @param null|int|\DateInterval $ttl Optional. The TTL value of this item. If no value is sent and
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* the driver supports TTL then the library may set a default value
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* for it or let the driver take care of that.
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*
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* @return bool True on success and false on failure.
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*
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* @throws \Psr\SimpleCache\InvalidArgumentException
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* MUST be thrown if $values is neither an array nor a Traversable,
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* or if any of the $values are not a legal value.
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*/
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public function setMultiple($values, $ttl = null)
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{
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$dataToSave = [];
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foreach ($values as $key => $value) {
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$dataToSave["$this->prefix:$key"] = $value;
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}
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return \apcu_store($dataToSave, null, $this->tllToInt($ttl));
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}
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/**
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* Deletes multiple cache items in a single operation.
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*
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* @param iterable $keys A list of string-based keys to be deleted.
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*
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* @return bool True if the items were successfully removed. False if there was an error.
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*
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* @throws \Psr\SimpleCache\InvalidArgumentException
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* MUST be thrown if $keys is neither an array nor a Traversable,
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* or if any of the $keys are not a legal value.
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*/
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public function deleteMultiple($keys)
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{
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$keysToDelete = $this->keysToFetch($keys);
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return \apcu_delete($keysToDelete);
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}
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/**
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* Determines whether an item is present in the cache.
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*
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* NOTE: It is recommended that has() is only to be used for cache warming type purposes
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* and not to be used within your live applications operations for get/set, as this method
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* is subject to a race condition where your has() will return true and immediately after,
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* another script can remove it making the state of your app out of date.
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*
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* @param string $key The cache item key.
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*
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* @return bool
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*
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* @throws \Psr\SimpleCache\InvalidArgumentException
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* MUST be thrown if the $key string is not a legal value.
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*/
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public function has($key)
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{
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return \apcu_exists("$this->prefix:$key");
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}
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/**
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* @param iterable $keys
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* @return array
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*/
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private function keysToFetch(iterable $keys): array
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{
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$keysToFetch = [];
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foreach ($keys as $key) {
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$keysToFetch[] = "$this->prefix:$key";
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}
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return $keysToFetch;
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}
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/**
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* @param null|int|\DateInterval $ttl
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* @return int
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*/
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private function tllToInt($ttl = null): int
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{
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if ($ttl === null) {
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return 0;
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} elseif (is_int($ttl)) {
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return $ttl;
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} elseif ($ttl instanceof \DateInterval) {
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return $ttl->days * 86400 + $ttl->h * 3600 + $ttl->i * 60 + $ttl->s;
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} else {
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throw new \Psr\SimpleCache\InvalidArgumentException("Invalid ttl value '$ttl' provided.");
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}
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}
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} |