First draft for plugins system

2015-09-13 14:07:56 -04:00
parent c405f99fc8
commit a6a00a0040
31 changed files with 626 additions and 237 deletions
--- a/app/Core/PluginLoader.php
+++ b/app/Core/PluginLoader.php
@@ -0,0 +1,144 @@
+<?php
+
+namespace Core;
+
+use DirectoryIterator;
+use PDOException;
+
+/**
+ * Plugin Loader
+ *
+ * @package  core
+ * @author   Frederic Guillot
+ */
+class PluginLoader extends Base
+{
+    /**
+     * Schema version table for plugins
+     *
+     * @var string
+     */
+    const TABLE_SCHEMA = 'plugin_schema_versions';
+
+    /**
+     * Plugin folder
+     *
+     * @var string
+     */
+    const PATH = __DIR__.'/../../plugins';
+
+    /**
+     * Scan plugin folder and load plugins
+     *
+     * @access public
+     */
+    public function scan()
+    {
+        if (file_exists(self::PATH)) {
+            $dir = new DirectoryIterator(self::PATH);
+
+            foreach ($dir as $fileinfo) {
+                if (! $fileinfo->isDot() && $fileinfo->isDir()) {
+                    $plugin = $fileinfo->getFilename();
+                    $this->loadSchema($plugin);
+                    $this->load($plugin);
+                }
+            }
+        }
+    }
+
+    /**
+     * Load plugin
+     *
+     * @access public
+     */
+    public function load($plugin)
+    {
+        $class = '\Plugin\\'.$plugin.'\\Plugin';
+        $instance = new $class($this->container);
+
+        Tool::buildDic($this->container, $instance->getClasses());
+
+        $instance->initialize();
+    }
+
+    /**
+     * Load plugin schema
+     *
+     * @access public
+     * @param  string  $plugin
+     */
+    public function loadSchema($plugin)
+    {
+        $filename = __DIR__.'/../../plugins/'.$plugin.'/Schema/'.ucfirst(DB_DRIVER).'.php';
+
+        if (file_exists($filename)) {
+            require($filename);
+            $this->migrateSchema($plugin);
+        }
+    }
+
+    /**
+     * Execute plugin schema migrations
+     *
+     * @access public
+     * @param  string  $plugin
+     */
+    public function migrateSchema($plugin)
+    {
+        $last_version = constant('\Plugin\\'.$plugin.'\Schema\VERSION');
+        $current_version = $this->getSchemaVersion($plugin);
+
+        try {
+
+            $this->db->startTransaction();
+            $this->db->getDriver()->disableForeignKeys();
+
+            for ($i = $current_version + 1; $i <= $last_version; $i++) {
+                $function_name = '\Plugin\\'.$plugin.'\Schema\version_'.$i;
+
+                if (function_exists($function_name)) {
+                    call_user_func($function_name, $this->db->getConnection());
+                }
+            }
+
+            $this->db->getDriver()->enableForeignKeys();
+            $this->db->closeTransaction();
+            $this->setSchemaVersion($plugin, $i - 1);
+        }
+        catch (PDOException $e) {
+            $this->db->cancelTransaction();
+            $this->db->getDriver()->enableForeignKeys();
+            die('Unable to migrate schema for the plugin: '.$plugin.' => '.$e->getMessage());
+        }
+    }
+
+    /**
+     * Get current plugin schema version
+     *
+     * @access public
+     * @param  string  $plugin
+     * @return integer
+     */
+    public function getSchemaVersion($plugin)
+    {
+        return (int) $this->db->table(self::TABLE_SCHEMA)->eq('plugin', strtolower($plugin))->findOneColumn('version');
+    }
+
+    /**
+     * Save last plugin schema version
+     *
+     * @access public
+     * @param  string   $plugin
+     * @param  integer  $version
+     * @return boolean
+     */
+    public function setSchemaVersion($plugin, $version)
+    {
+        $dictionary = array(
+            strtolower($plugin) => $version
+        );
+
+        return $this->db->getDriver()->upsert(self::TABLE_SCHEMA, 'plugin', 'version', $dictionary);
+    }
+}