[CACHE] Add a static wrapper around symfony/cache

src/Core/Cache.php

@@ -0,0 +1,61 @@
+<?php
+
+// {{{ License
+// This file is part of GNU social - https://www.gnu.org/software/social
+//
+// GNU social is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GNU social is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with GNU social.  If not, see <http://www.gnu.org/licenses/>.
+// }}}
+
+namespace App\Core\Cache;
+
+use Functional as F;
+use Symfony\Component\Cache\Adapter\AbstractAdapter;
+use Symfony\Component\Cache\Adapter\ChainAdapter;
+
+abstract class Cache
+{
+    protected static AbstractAdapter $pool;
+    private const ENV_VAR = 'SOCIAL_CACHE_ADAPTER';
+
+    /**
+     * Configure a cache pool, with adapters taken from `ENV_VAR`.
+     * We may want multiple of these in the future, but for now it seems
+     * unnecessary
+     */
+    public static function setPool()
+    {
+        if (!isset($_ENV[ENV_VAR])) {
+            return;
+        }
+
+        $adapters = F\map(explode(':', strtolower($_ENV[ENV_VAR])),
+                          function (string $a) {
+                              return 'Adapter\\' . ucfirst($a) . 'Adapter';
+                          });
+
+        if (count($adapters) === 1) {
+            self::$pool = new $adapters[0];
+        } else {
+            self::$pool = new ChainAdapter($adapters);
+        }
+    }
+
+    /**
+     * Forward calls to the configured $pool
+     */
+    public static function __callStatic(string $name, array $args)
+    {
+        return self::$pool->{$name}(...$args);
+    }
+}

src/Core/GNUsocial.php

@@ -99,6 +99,7 @@ class GNUsocial implements EventSubscriberInterface
         Form::setFactory($this->form_factory);
         Queue::setMessageBus($this->message_bus);
 
+        Cache::setPool();
         DefaultSettings::setDefaults();
         ModulesManager::loadModules();
     }