222 lines
9.2 KiB
PHP
222 lines
9.2 KiB
PHP
<?php
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// {{{ License
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero 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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// GNU social 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 Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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// }}}
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namespace App\Core;
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use App\Util\Common;
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use Functional as F;
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use Redis;
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use RedisCluster;
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use SplFixedArray;
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use Symfony\Component\Cache\Adapter;
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use Symfony\Component\Cache\Adapter\ChainAdapter;
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abstract class Cache
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{
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protected static $pools;
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protected static $redis;
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/**
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* Configure a cache pool, with adapters taken from `ENV_VAR`.
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* We may want multiple of these in the future, but for now it seems
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* unnecessary
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*/
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public static function setupCache()
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{
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self::$pools = [];
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self::$redis = [];
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$adapters = [];
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foreach (Common::config('cache', 'adapters') as $pool => $val) {
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self::$pools[$pool] = [];
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self::$redis[$pool] = [];
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foreach (explode(',', $val) as $dsn) {
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list($scheme, $rest) = explode('://', $dsn);
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$partial_to_dsn = function ($r) use ($scheme) { return $scheme . '://' . $r; };
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switch ($scheme) {
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case 'redis':
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// Redis can have multiple servers, but we want to take proper advantage of
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// redis, not just as a key value store, but using it's datastructures
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$dsns = explode(',', $rest);
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if (count($dsns) === 1) {
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$class = Redis::class;
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$r = new Redis();
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if ($rest[0] != '/' && strstr($rest, ':') != false) {
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list($host, $port) = explode(':', $rest);
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$r->pconnect($host, $port);
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} else {
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$r->pconnect($rest);
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}
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} else {
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$class = RedisCluster::class; // true for persistent connection
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$r = new RedisCluster(null, $dsns, null, null, true);
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// Distribute reads randomly
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$r->setOption($class::OPT_SLAVE_FAILOVER, $class::FAILOVER_DISTRIBUTE);
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}
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// Improved serializer
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$r->setOption($class::OPT_SERIALIZER, $class::SERIALIZER_MSGPACK);
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// Persistent connection
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$r->setOption($class::OPT_TCP_KEEPALIVE, true);
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// Use LZ4 for the improved decompression speed (while keeping an okay compression ratio)
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$r->setOption($class::OPT_COMPRESSION, $class::COMPRESSION_LZ4);
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self::$redis[$pool] = $r;
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$adapters[$pool][] = new Adapter\RedisAdapter($r);
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break;
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case 'memcached':
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// memcached can also have multiple servers
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$dsns = F\map(explode(',', $rest), $partial_to_dsn);
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$adapters[$pool][] = new Adapter\MemcachedAdapter($dsns);
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break;
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case 'filesystem':
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$adapters[$pool][] = new Adapter\FilesystemAdapter($rest);
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break;
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case 'apcu':
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$adapters[$pool][] = new Adapter\ApcuAdapter();
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break;
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case 'opcache':
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$adapters[$pool][] = new Adapter\PhpArrayAdapter($rest, new FilesystemAdapter($rest . '.fallback'));
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break;
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case 'doctrine':
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$adapters[$pool][] = new Adapter\PdoAdapter($dsn);
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break;
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default:
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Log::error("Unknown or discouraged cache scheme '{$scheme}'");
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return;
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}
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}
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if (count($adapters[$pool]) === 1) {
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self::$pools[$pool] = array_pop($adapters[$pool]);
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} else {
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self::$pools[$pool] = new ChainAdapter($adapters);
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}
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}
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}
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public static function set(string $key, mixed $value, string $pool = 'default')
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{
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// there's no set method, must be done this way
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return self::$pools[$pool]->get($key, function ($i) use ($value) { return $value; }, INF);
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}
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public static function get(string $key, callable $calculate, string $pool = 'default', float $beta = 1.0)
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{
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return self::$pools[$pool]->get($key, $calculate, $beta);
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}
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public static function delete(string $key, string $pool = 'default'): bool
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{
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return self::$pools[$pool]->delete($key);
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}
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/**
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* Retrieve a list from the cache, with a different implementation
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* for redis and others, trimming to $max_count if given
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*/
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public static function getList(string $key, callable $calculate, string $pool = 'default', int $max_count = -1, float $beta = 1.0): array
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{
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if (isset(self::$redis[$pool])) {
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if (!($recompute = $beta === INF || !(self::$redis[$pool]->exists($key)))) {
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if (is_float($er = Common::config('cache', 'early_recompute'))) {
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$recompute = (mt_rand() / mt_getrandmax() > $er);
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Log::info('Item "{key}" elected for early recomputation', ['key' => $key]);
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} else {
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if ($recompute = ($idletime = self::$redis[$pool]->object('idletime', $key) ?? false) && ($expiry = self::$redis[$pool]->ttl($key) ?? false) && $expiry <= $idletime / 1000 * $beta * log(random_int(1, PHP_INT_MAX) / PHP_INT_MAX)) {
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Log::info('Item "{key}" elected for early recomputation {delta}s before its expiration', [
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'key' => $key,
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'delta' => sprintf('%.1f', $expiry - microtime(true)),
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]);
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}
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}
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}
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if ($recompute) {
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$save = true; // Pass by reference
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$res = $calculate(null, $save);
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if ($save) {
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self::$redis[$pool]->del($key);
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self::$redis[$pool]->lPush($key, ...$res);
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}
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}
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self::$redis[$pool]->lTrim($key, 0, $max_count);
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return self::$redis[$pool]->lRange($key, 0, $max_count);
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} else {
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$keys = self::getKeyList($key, $max_count, $beta);
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$list = new SplFixedArray($keys->count());
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foreach ($keys as $k) {
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$list[] = self::get($k, $calculate, $pool, $beta);
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}
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return $list->toArray();
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}
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}
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/**
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* Push a value to the list, if not using redis, get, add to subkey and set
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*/
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public static function pushList(string $key, mixed $value, string $pool = 'default', int $max_count = 64, float $beta = 1.0): void
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{
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if (isset(self::$redis[$pool])) {
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self::$redis[$pool]
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// doesn't need to be atomic, adding at one end, deleting at the other
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->multi(Redis::PIPELINE)
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->lPush($key, $value)
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// trim to $max_count, unless it's 0
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->lTrim($key, 0, $max_count != 0 ? $max_count : -1)
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->exec();
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} else {
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$keys = self::getKeyList($key, $max_count, $beta);
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$vkey = $key . ':' . count($keys);
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self::set($vkey, $value);
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$keys[] = $vkey;
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self::set($key, $keys);
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}
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}
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/**
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* Delete a whole list at $key, if not using redis, recurse into keys
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*/
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public static function deleteList(string $key, string $pool = 'default'): bool
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{
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if (isset(self::$redis[$pool])) {
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return self::$redis[$pool]->del($key) == 1;
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} else {
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$keys = self::getKeyList($key, $max_count, $beta);
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if (!F\every($keys, function ($k) use ($pool) { return self::delete($k, $pool); })) {
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Log::warning("Some element of the list associated with {$key} was not deleted. There may be some memory leakage in the cache process");
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}
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return self::delete($key, $pool);
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}
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}
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/**
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* On non-Redis, get the list of keys that store a list at $key
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*/
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private static function getKeyList(string $key, int $max_count, string $pool, float $beta): RingBuffer
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{
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// Get the current keys associated with a list. If the cache
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// is not primed, the function is called and returns an empty
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// ring buffer
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return self::get($key,
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function (ItemInterface $i) use ($max_count) {
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return new RingBuffer($max_count);
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}, $pool, $beta);
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}
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}
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