473 lines
19 KiB
PHP
473 lines
19 KiB
PHP
<?php
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declare(strict_types = 1);
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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\Core\DB\DB;
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use App\Entity\Actor;
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use App\Entity\LocalUser;
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use App\Entity\Note;
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use App\Util\Common;
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use App\Util\Exception\ConfigurationException;
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use App\Util\Exception\NotImplementedException;
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use Functional as F;
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use InvalidArgumentException;
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use Redis;
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use RedisCluster;
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use Symfony\Component\Cache\Adapter;
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use Symfony\Component\Cache\Adapter\ChainAdapter;
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use Symfony\Component\Cache\CacheItem;
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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::$redis = null;
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$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 $dsn) {
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if (str_contains($dsn, '://')) {
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[$scheme, $rest] = explode('://', $dsn);
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} else {
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$scheme = $dsn;
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$rest = '';
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}
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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(';', $dsn);
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if (\count($dsns) === 1) {
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$class = Redis::class;
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$r = new Redis();
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$r->pconnect($rest);
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} else {
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// @codeCoverageIgnoreStart
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// This requires extra server configuration, but the code was tested
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// manually and works, so it'll be excluded from automatic tests, for now, at least
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if (F\Every($dsns, function ($str) { [$scheme, $rest] = explode('://', $str); return str_contains($rest, ':'); }) == false) {
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throw new ConfigurationException('The configuration of a redis cluster requires specifying the ports to use');
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}
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$class = RedisCluster::class; // true for persistent connection
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$seeds = F\Map($dsns, fn ($str) => explode('://', $str)[1]);
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$r = new RedisCluster(name: null, seeds: $seeds, timeout: null, readTimeout: null, persistent: true);
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// Distribute reads randomly
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$r->setOption($class::OPT_SLAVE_FAILOVER, $class::FAILOVER_DISTRIBUTE);
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// @codeCoverageIgnoreEnd
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}
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// Improved serializer
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$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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// @codeCoverageIgnoreStart
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// These all are excluded from automatic testing, as they require an unreasonable amount
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// of configuration in the testing environment. The code is really simple, so it should work
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// memcached can also have multiple servers
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$dsns = explode(';', $dsn);
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$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 Adapter\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 '{$scheme}'");
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return;
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// @codeCoverageIgnoreEnd
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}
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}
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if (self::$redis[$pool] == null) {
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unset(self::$redis[$pool]);
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}
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if (\count($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[$pool]);
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}
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}
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}
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/**
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* Worker function for doing redis requests that may need to be recomputed. Given a key, it
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* either uses the configuration value or the object lifetime to statistically determine if a
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* cache entry specified by $key should be recomputed, to avoid cache stampedes (when a lot of keys expire at once)
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*/
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private static function redisMaybeRecompute(string $key, callable $recompute, callable $no_recompute, string $pool = 'default', float $beta = 1.0): mixed
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{
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$should_recompute = $beta === \INF || !self::$redis[$pool]->exists($key);
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if (!$should_recompute) {
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$er = Common::config('cache', 'early_recompute');
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if (\is_float($er)) {
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if ($should_recompute = (mt_rand() / mt_getrandmax() > $er)) {
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Log::info('Item "{key}" elected for early recomputation', ['key' => $key]);
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}
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} elseif ($er === true) {
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if ($should_recompute = ($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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// @codeCoverageIgnoreStart
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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', $expiry - microtime(true)),
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]);
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// @codeCoverageIgnoreEnd
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}
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} else {
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$should_recompute = false;
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}
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}
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if ($should_recompute) {
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return $recompute();
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} else {
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return $no_recompute();
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}
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}
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public static function set(string $key, mixed $value, string $pool = 'default')
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{
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if (isset(self::$redis[$pool])) {
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return self::$redis[$pool]->set($key, $value);
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} else {
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// there's no set method, must be done this way
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return self::$pools[$pool]->get($key, fn ($i) => $value, \INF);
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}
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}
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/**
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* @param callable(mixed, bool &$save): mixed $calculate
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*/
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public static function get(string $key, callable $calculate, string $pool = 'default', float $beta = 1.0)
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{
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if (isset(self::$redis[$pool])) {
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return self::redisMaybeRecompute(
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$key,
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recompute: function () use ($key, $calculate, $pool) {
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$save = true; // Pass by reference
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$res = $calculate(null, $save);
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if ($save) {
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self::set($key, $res, $pool);
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}
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return $res;
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},
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no_recompute: fn () => self::$redis[$pool]->get($key),
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pool: $pool,
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beta: $beta,
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);
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} else {
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return self::$pools[$pool]->get($key, $calculate, $beta);
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}
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}
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public static function delete(string $key, string $pool = 'default'): bool
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{
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if (isset(self::$redis[$pool])) {
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return self::$redis[$pool]->del($key) === 1;
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} else {
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return self::$pools[$pool]->delete($key);
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}
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}
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public static function exists(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[$pool]->exists($key);
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} else {
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// there's no set method, must be done this way
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return self::$pools[$pool]->hasItem($key);
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}
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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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* @param callable(?CacheItem $item, bool &$save): (string|object|array<int,mixed>) $calculate
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*/
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public static function getList(string $key, callable $calculate, string $pool = 'default', ?int $max_count = null, ?int $left = null, ?int $right = null, float $beta = 1.0): array
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{
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if (isset(self::$redis[$pool])) {
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return self::redisMaybeRecompute(
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$key,
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recompute: /**
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* Caculate and trim the list to the correct size
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*/
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function () use ($key, $calculate, $pool, $max_count, $left, $right, $beta) {
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$save = true; // Pass by reference
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$res = $calculate(null, $save);
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if ($save) {
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self::setList($key, $res, $pool, $max_count, $beta);
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}
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$offset = $left ?? 0;
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if (\is_null($right) && \is_null($max_count)) {
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$length = null;
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} else {
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$length = ($right ?? $max_count) - $offset;
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}
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return \array_slice($res, $offset, $length);
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},
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no_recompute: /**
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* Fetch (a portion of) the list from the cache
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*/
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fn () => self::$redis[$pool]->lRange($key, $left ?? 0, ($right ?? $max_count ?? 0) - 1),
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pool: $pool,
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beta: $beta,
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);
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} else {
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return self::get(
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$key,
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/**
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* Fetch the list from the cache and possibly trim the length
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*/
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function () use ($calculate, $max_count) {
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$save = true;
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$res = $calculate(null, $save);
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if ($max_count != -1) {
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$res = \array_slice($res, 0, $max_count);
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}
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return $res;
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},
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$pool,
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$beta,
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);
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}
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}
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/**
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* Set the list
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*/
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public static function setList(string $key, array $value, string $pool = 'default', ?int $max_count = null, float $beta = 1.0): void
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{
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if (isset(self::$redis[$pool])) {
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if (empty($value)) {
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self::$redis[$pool]->del($key); // Redis doesn't support empty lists
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} else {
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self::$redis[$pool] // Ensure atomic
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->multi(Redis::MULTI)
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->del($key)
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->rPush($key, ...$value)
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// trim to $max_count, unless it's 0
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->lTrim($key, 0, $max_count ?? -1)
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->exec();
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}
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} else {
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self::set($key, \array_slice($value, 0, $max_count), $pool);
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}
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}
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/**
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* Push a value to the list
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*/
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public static function pushList(string $key, mixed $value, string $pool = 'default', ?int $max_count = null, 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 $max_count, if given
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->lTrim($key, 0, ($max_count ?? 0) - 1)
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->exec();
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} else {
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$res = self::get($key, fn () => [], $pool, $beta);
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array_unshift($res, $value);
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if (!\is_null($max_count)) {
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$res = \array_slice($res, 0, $max_count); // Trim away the older values
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}
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self::set($key, $res, $pool);
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}
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}
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/**
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* Delete a whole list at $key
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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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return self::delete($key, $pool);
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}
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}
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/**
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* Retrieve a hashmap from the cache, with a different implementation
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* for redis and others. Different from lists, works with string map_keys
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*
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* @param callable(?CacheItem $item, bool &$save): (string|object|array<string,mixed>) $calculate
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* @TODO cleanup
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*/
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public static function getHashMap(string $map_key, callable $calculate, string $pool = 'default', float $beta = 1.0): array
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{
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if (isset(self::$redis[$pool])) {
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return self::redisMaybeRecompute(
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$map_key,
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recompute: function () use ($map_key, $calculate, $pool) {
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$save = true; // Pass by reference
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$res = $calculate(null, $save);
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if ($save) {
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self::setHashMap($map_key, $res, $pool);
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}
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return $res;
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},
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no_recompute: fn () => self::$redis[$pool]->hGetAll($map_key),
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pool: $pool,
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beta: $beta,
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);
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} else {
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throw new NotImplementedException();
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}
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}
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/**
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* Set the list
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*/
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public static function setHashMap(string $map_key, array $value, string $pool = 'default'): void
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{
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if (isset(self::$redis[$pool])) {
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if (empty($value)) {
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self::$redis[$pool]->del($map_key); // Redis doesn't support empty lists
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} else {
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self::$redis[$pool] // Ensure atomic
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->multi(Redis::MULTI)
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->del($map_key);
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foreach ($value as $field_key => $field_value) {
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self::$redis[$pool]->hSet($map_key, (string) $field_key, $field_value);
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}
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self::$redis[$pool]->exec();
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}
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} else {
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self::set($map_key, $value, $pool);
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}
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}
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/**
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* Fetch the value(s) for key $key in the hashmap identified by
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* $map_key. If not found, use $calculate_map to calculate the
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* _entire_ hashmap (not just those in $key)
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*/
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public static function getHashMapKey(string $map_key, string|array $key, callable $calculate_map, string $pool = 'default')
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{
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if (isset(self::$redis[$pool])) {
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$get = function () use ($key, $map_key, $pool) {
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if (\is_string($key)) {
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return self::$redis[$pool]->hget($map_key, $key);
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} else {
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return self::$redis[$pool]->hmget($map_key, $key);
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}
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};
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$res = $get();
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if (empty($res)) {
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self::setHashMap($map_key, $calculate_map(), $pool);
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$res = $get();
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}
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return $res;
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} else {
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throw new NotImplementedException;
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}
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}
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/**
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* Create a cached stream of Notes, paged
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*
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* Note: the number of notes per page may not always be the same,
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* because of scoping. This would make this even more complicated
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* and is left as an exercise to the reader :^)
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* TODO Ensure same number of notes per page
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*
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* @return Note[]
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*/
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public static function pagedStream(string $key, string $query, array $query_args, LocalUser|Actor|null $actor = null, int $page = 1, ?int $per_page = null, string $pool = 'default', ?int $max_count = null, float $beta = 1.0): array
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{
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$max_count ??= Common::config('cache', 'max_note_count');
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if ($per_page > $max_count) {
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throw new InvalidArgumentException;
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}
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if (\is_null($per_page)) {
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$per_page = Common::config('feeds', 'entries_per_page');
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}
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$filter_scope = fn (Note|Actor $o) => $o->isVisibleTo($actor);
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$getter = fn (int $offset, int $length) => DB::dql($query, $query_args, options: ['offset' => $offset, 'limit' => $length]);
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$requested_left = $offset = $per_page * ($page - 1);
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$requested_right = $requested_left + $per_page;
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[$stored_left, $stored_right] = F\map(
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explode(':', self::get("{$key}-bounds", fn () => "{$requested_left}:{$requested_right}")),
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fn (string $v) => (int) $v,
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);
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$length = $stored_right - $stored_left;
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if (!\is_null($max_count) && $length > $max_count) {
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$length = $max_count;
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$requested_right = $requested_left + $max_count;
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}
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if ($stored_left > $requested_left || $stored_right < $requested_right) {
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$res = $getter($stored_left, $stored_right);
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self::setList($key, value: $res, pool: $pool, max_count: $max_count, beta: $beta);
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self::set("{$key}-bounds", "{$stored_left}:{$stored_right}");
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return F\filter($res, $filter_scope);
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}
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return F\filter(
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self::getList(
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$key,
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fn () => $getter($requested_left, $length),
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max_count: $max_count,
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left: $requested_left,
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right: $requested_right,
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beta: $beta,
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),
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$filter_scope,
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);
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}
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}
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