Add new settings service

[MAILPOET-1757]

lib/Settings/SettingsController.php

@@ -0,0 +1,104 @@
+<?php
+namespace MailPoet\Settings;
+
+use Composer\Package\Package;
+use MailPoet\Models\Setting;
+
+class SettingsController {
+  private static $loaded = false;
+
+  private static $settings = [];
+
+  function get($key, $default = null) {
+    $this->ensureLoaded();
+    $keys = explode('.', $key);
+    $setting = self::$settings;
+    if($default === null) {
+      $default = $this->getDefault($keys);
+    }
+    foreach($keys as $key) {
+      if(array_key_exists($key, $setting)) {
+        $setting = $setting[$key];
+      } else {
+        return $default;
+      }
+    }
+    if(is_array($setting) && is_array($default)) {
+      return array_replace_recursive($default, $setting);
+    }
+    return $setting;
+  }
+
+  function getDefaults() {
+    return Setting::getDefaults();
+  }
+
+  /**
+   * Fetches the value from DB and update in cache
+   * This is required for sync settings between parallel processes e.g. cron
+   */
+  function fetch($key, $default = null) {
+    $keys = explode('.', $key);
+    $main_key = $keys[0];
+    self::$settings[$main_key] = Setting::getValue($main_key);
+    return $this->get($key, $default);
+  }
+
+  function getAll() {
+    $this->ensureLoaded();
+    return self::$settings;
+  }
+
+  function set($key, $value) {
+    $this->ensureLoaded();
+    $keys = explode('.', $key);
+    $main_key = $keys[0];
+    $last_key = array_pop($keys);
+    $settings = self::$settings;
+    $setting =& $settings;
+    foreach($keys as $key) {
+      $setting =& $setting[$key];
+      if(!is_array($setting)) {
+        $setting = [];
+      }
+    }
+    $setting[$last_key] = $value;
+    Setting::setValue($main_key, $settings[$main_key]);
+    self::$settings = $settings;
+  }
+
+  function delete($key) {
+    Setting::deleteValue($key);
+    unset(self::$settings[$key]);
+  }
+
+  private function ensureLoaded() {
+    if(self::$loaded) {
+      return;
+    }
+    self::$settings = Setting::getAll() ?: [];
+    self::$loaded = true;
+  }
+
+  private function getDefault($keys) {
+    $default = $this->getDefaults();
+    foreach($keys as $key) {
+      if(array_key_exists($key, $default)) {
+        $default = $default[$key];
+      } else {
+        return null;
+      }
+    }
+    return $default;
+  }
+
+  /**
+   * Temporary function for tests use only.
+   * It is needed until this is only instantiated in one place (DI Container)
+   * Once this is achieved we can make properties not static and remove this method
+   */
+  static function resetCache() {
+    self::$settings = [];
+    self::$loaded = false;
+  }
+}