Add Config adapter interfaces/classes

src/Core/Config/JITConfigAdapter.php

@@ -0,0 +1,132 @@
+<?php
+namespace Friendica\Core\Config;
+
+use dba;
+use Friendica\BaseObject;
+use Friendica\Database\DBM;
+
+require_once 'include/dba.php';
+
+/**
+ * JustInTime ConfigAdapter
+ *
+ * Default Config Adapter. Provides the best performance for pages loading few configuration variables.
+ *
+ * @author Hypolite Petovan <mrpetovan@gmail.com>
+ */
+class JITConfigAdapter extends BaseObject implements IConfigAdapter
+{
+	private $cache;
+	private $in_db;
+
+	public function load($cat = "config")
+	{
+		// We don't preload "system" anymore.
+		// This reduces the number of database reads a lot.
+		if ($cat === 'system') {
+			return;
+		}
+
+		$a = self::getApp();
+
+		$configs = dba::select('config', ['v', 'k'], ['cat' => $cat]);
+		while ($config = dba::fetch($configs)) {
+			$k = $config['k'];
+			if ($cat === 'config') {
+				$a->config[$k] = $config['v'];
+			} else {
+				$a->config[$cat][$k] = $config['v'];
+				self::$cache[$cat][$k] = $config['v'];
+				self::$in_db[$cat][$k] = true;
+			}
+		}
+		dba::close($configs);
+	}
+
+	public function get($cat, $k, $default_value = null, $refresh = false)
+	{
+		$a = self::getApp();
+
+		if (!$refresh) {
+			// Do we have the cached value? Then return it
+			if (isset($this->cache[$cat][$k])) {
+				if ($this->cache[$cat][$k] === '!<unset>!') {
+					return $default_value;
+				} else {
+					return $this->cache[$cat][$k];
+				}
+			}
+		}
+
+		$config = dba::selectFirst('config', ['v'], ['cat' => $cat, 'k' => $k]);
+		if (DBM::is_result($config)) {
+			// manage array value
+			$value = (preg_match("|^a:[0-9]+:{.*}$|s", $config['v']) ? unserialize($config['v']) : $config['v']);
+
+			// Assign the value from the database to the cache
+			$this->cache[$cat][$k] = $value;
+			$this->in_db[$cat][$k] = true;
+			return $value;
+		} elseif (isset($a->config[$cat][$k])) {
+			// Assign the value (mostly) from the .htconfig.php to the cache
+			$this->cache[$cat][$k] = $a->config[$cat][$k];
+			$this->in_db[$cat][$k] = false;
+
+			return $a->config[$cat][$k];
+		}
+
+		$this->cache[$cat][$k] = '!<unset>!';
+		$this->in_db[$cat][$k] = false;
+
+		return $default_value;
+	}
+
+	public function set($cat, $k, $value)
+	{
+		$a = self::getApp();
+
+		// We store our setting values in a string variable.
+		// So we have to do the conversion here so that the compare below works.
+		// The exception are array values.
+		$dbvalue = (!is_array($value) ? (string)$value : $value);
+
+		$stored = $this->get($cat, $k, null, true);
+
+		if (($stored === $dbvalue) && $this->in_db[$cat][$k]) {
+			return true;
+		}
+
+		if ($cat === 'config') {
+			$a->config[$k] = $dbvalue;
+		} elseif ($cat != 'system') {
+			$a->config[$cat][$k] = $dbvalue;
+		}
+
+		// Assign the just added value to the cache
+		$this->cache[$cat][$k] = $dbvalue;
+
+		// manage array value
+		$dbvalue = (is_array($value) ? serialize($value) : $dbvalue);
+
+		$result = dba::update('config', ['v' => $dbvalue], ['cat' => $cat, 'k' => $k], true);
+
+		if ($result) {
+			$this->in_db[$cat][$k] = true;
+			return $value;
+		}
+
+		return $result;
+	}
+
+	public function delete($cat, $k)
+	{
+		if (isset($this->cache[$cat][$k])) {
+			unset($this->cache[$cat][$k]);
+			unset($this->in_db[$cat][$k]);
+		}
+
+		$result = dba::delete('config', ['cat' => $cat, 'k' => $k]);
+
+		return $result;
+	}
+}