load configuration options from database at runtime

classes/Config.php

@@ -1,8 +1,29 @@
 <?php
+/*
+ * Laconica - a distributed open-source microblogging tool
+ * Copyright (C) 2008, 2009, Control Yourself, Inc.
+ *
+ * This program 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.
+ *
+ * This program 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 this program.     If not, see <http://www.gnu.org/licenses/>.
+ */
+
+if (!defined('LACONICA')) { exit(1); }
+
 /**
  * Table Definition for config
  */
-require_once 'classes/Memcached_DataObject.php';
+
+require_once INSTALLDIR.'/classes/Memcached_DataObject.php';
 
 class Config extends Memcached_DataObject
 {
@@ -19,4 +40,90 @@ class Config extends Memcached_DataObject
 
     /* the code above is auto generated do not remove the tag below */
     ###END_AUTOCODE
+
+    const settingsKey = 'config:settings';
+
+    static function loadSettings()
+    {
+        $settings = self::_getSettings();
+        if (!empty($settings)) {
+            self::_applySettings($settings);
+        }
+    }
+
+    static function _getSettings()
+    {
+        $c = self::memcache();
+
+        if (!empty($c)) {
+            $settings = $c->get(common_cache_key(self::settingsKey));
+            if (!empty($settings)) {
+                return $settings;
+            }
+        }
+
+        $settings = array();
+
+        $config = new Config();
+
+        $config->find();
+
+        while ($config->fetch()) {
+            $settings[] = array($config->section, $config->setting, $config->value);
+        }
+
+        $config->free();
+
+        if (!empty($c)) {
+            $c->set(common_cache_key(self::settingsKey), $settings);
+        }
+
+        return $settings;
+    }
+
+    static function _applySettings($settings)
+    {
+        global $config;
+
+        foreach ($settings as $s) {
+            list($section, $setting, $value) = $s;
+            $config[$section][$setting] = $value;
+        }
+    }
+
+    function insert()
+    {
+        $result = parent::insert();
+        if ($result) {
+            Config::_blowSettingsCache();
+        }
+        return $result;
+    }
+
+    function delete()
+    {
+        $result = parent::delete();
+        if ($result) {
+            Config::_blowSettingsCache();
+        }
+        return $result;
+    }
+
+    function update($orig=null)
+    {
+        $result = parent::update($orig);
+        if ($result) {
+            Config::_blowSettingsCache();
+        }
+        return $result;
+    }
+
+    function _blowSettingsCache()
+    {
+        $c = self::memcache();
+
+        if (!empty($c)) {
+            $c->delete(common_cache_key(self::settingsKey));
+        }
+    }
 }

lib/common.php

@@ -21,6 +21,8 @@ if (!defined('LACONICA')) { exit(1); }
 
 define('LACONICA_VERSION', '0.9.0dev');
 
+// XXX: move these to class variables
+
 define('AVATAR_PROFILE_SIZE', 96);
 define('AVATAR_STREAM_SIZE', 48);
 define('AVATAR_MINI_SIZE', 24);
@@ -369,26 +371,6 @@ if ($_db_name != 'laconica' && !array_key_exists('ini_'.$_db_name, $config['db']
     $config['db']['ini_'.$_db_name] = INSTALLDIR.'/classes/laconica.ini';
 }
 
-// XXX: how many of these could be auto-loaded on use?
-
-require_once 'Validate.php';
-require_once 'markdown.php';
-
-require_once INSTALLDIR.'/lib/util.php';
-require_once INSTALLDIR.'/lib/action.php';
-require_once INSTALLDIR.'/lib/theme.php';
-require_once INSTALLDIR.'/lib/mail.php';
-require_once INSTALLDIR.'/lib/subs.php';
-require_once INSTALLDIR.'/lib/Shorturl_api.php';
-require_once INSTALLDIR.'/lib/twitter.php';
-
-require_once INSTALLDIR.'/lib/clientexception.php';
-require_once INSTALLDIR.'/lib/serverexception.php';
-
-// XXX: other formats here
-
-define('NICKNAME_FMT', VALIDATE_NUM.VALIDATE_ALPHA_LOWER);
-
 function __autoload($cls)
 {
     if (file_exists(INSTALLDIR.'/classes/' . $cls . '.php')) {
@@ -405,6 +387,32 @@ function __autoload($cls)
     }
 }
 
+// XXX: how many of these could be auto-loaded on use?
+// XXX: note that these files should not use config options
+// at compile time since DB config options are not yet loaded.
+
+require_once 'Validate.php';
+require_once 'markdown.php';
+
+require_once INSTALLDIR.'/lib/util.php';
+require_once INSTALLDIR.'/lib/action.php';
+require_once INSTALLDIR.'/lib/theme.php';
+require_once INSTALLDIR.'/lib/mail.php';
+require_once INSTALLDIR.'/lib/subs.php';
+require_once INSTALLDIR.'/lib/Shorturl_api.php';
+require_once INSTALLDIR.'/lib/twitter.php';
+
+require_once INSTALLDIR.'/lib/clientexception.php';
+require_once INSTALLDIR.'/lib/serverexception.php';
+
+// Load settings from database; note we need autoload for this
+
+Config::loadSettings();
+
+// XXX: other formats here
+
+define('NICKNAME_FMT', VALIDATE_NUM.VALIDATE_ALPHA_LOWER);
+
 // Give plugins a chance to initialize in a fully-prepared environment
 
 Event::handle('InitializePlugin');