initial commit for a jabberbot based on slixmpp

manager.py

@@ -0,0 +1,96 @@
+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+
+
+import sys
+import logging
+logging = logging.getLogger()
+import os.path
+import importlib
+from os import listdir
+
+
+class Plugin(object):
+
+    '''
+    Proto type of plugin class. Only subclasses are valid plugins.
+    '''
+    
+    __command = ''
+
+    @staticmethod
+    def get_module():
+        return Plugin.__module
+
+    @staticmethod
+    def get_command():
+        return Plugin.__command
+
+    @staticmethod
+    def get_description():
+        return Plugin.__description
+
+    def __init__(self, callback):
+        self.callback = callback
+
+    def help(self):
+        return 'Sorry ... Help is unavailable at the moment'
+
+    def run(self, msg):
+        self.callback('Sorry ... Run is unavailable at the moment')
+
+
+class PluginManager():
+    
+    '''
+    Handles the plugins. Optional becomes a directory for search plugins.
+    '''
+    
+    def __init__(self, plug_dir=None):
+        '''
+        Initialize callback function and plugin directory. If no callback is
+        given it returns imediality. If no plugin directory is given it uses
+        actual directory.
+        '''
+        if plug_dir is None:
+            self.plugin_dir = './plugins'
+        else: self.plugin_dir = plug_dir
+
+    def collect_plugins(self):
+        '''
+        Find all files in plugin directory and grabs filename, provided
+        command and short description.
+        '''
+        self.plugins = {}
+        search_dir = os.path.realpath(self.plugin_dir)
+        sys.path.insert(0, search_dir)
+        logging.debug('Search plugins in {}'.format(search_dir))
+        files = [x[:-3] for x in os.listdir(search_dir) if x.endswith('.py')]
+        for filename in files:
+            plugin = self.import_plugin(filename)
+            if plugin is False:
+                continue
+            command = plugin.Plugin.get_command()
+            self.plugins[command] = plugin
+        return self.plugins
+
+    def import_plugin(self, filename):
+        '''
+        Imports or reimports a module depending its known or not. It's
+        tested by the command provided by the plugin. (Not best praxis but
+        the easyst way. And i dont know, what a trouble is causes, if a
+        module ist moved.)
+        param 1: string
+        '''
+        try:
+            plugin = importlib.import_module(filename)
+        except Exception as e:
+            logging.error('Cant import module: {}'.format(filename))
+            logging.error('Exception: {}'.format(e))
+            return False
+        if not issubclass(plugin.Plugin, Plugin):
+            logging.error('Not a valid plugin: {}'.format(filename))
+            return False
+        logging.debug('Found plugin {}.'.format(filename))
+        return plugin
+