class-text-domain-cache.php

<?php
/*
Plugin Name: WooCart Machine Objects Cache
Description: Cache for localization files.
Version: 1.5.0
*/


class TexDomainCache
{
    public function __construct($redis_dsn)
    {
        $this->redis = new Redis();
        $this->redis->pconnect($redis_dsn);
        $this->redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_IGBINARY);

        add_filter('override_load_textdomain', [ & $this, 'cache_hook'], 1, 3);
    }

    public function cache_hook($retval, $domain, $mofile)
    {
        global $l10n;
        if (!is_readable($mofile)) {
            return false;
        }

        // WooCart defaults prunes all Redis keys prefixed with "cache:"
        // on cache invalidation action.
        $hash = "cache:mo:" . md5($mofile);

        $data = $this->redis->get($hash);
        $mo = new MO();

        if (!$data) {
            if (!$mo->import_from_file($mofile)) {
                return false;
            }
            $data = [
                'entries' => $mo->entries,
                'headers' => $mo->headers,
            ];
            $this->redis->set($hash, $data);
        } else {
            $mo->entries = $data['entries'];
            $mo->headers = $data['headers'];
        }

        if (isset($l10n[$domain])) {
            $mo->merge_with($l10n[$domain]);
        }

        $l10n[$domain] = &$mo;
        return true;
    }
}

new TexDomainCache("127.0.0.1");