vstf/vstf/agent/env/driver_plugins/manager.py

   1 ##############################################################################
   2 # Copyright (c) 2015 Huawei Technologies Co.,Ltd and others.
   3 #
   4 # All rights reserved. This program and the accompanying materials
   5 # are made available under the terms of the Apache License, Version 2.0
   6 # which accompanies this distribution, and is available at
   7 # http://www.apache.org/licenses/LICENSE-2.0
   8 ##############################################################################
   9
  10 import stevedore
  11
  12
  13 class DriverPluginManager(object):
  14     def __init__(self):
  15         self.plugins = {}
  16         self.mgr = stevedore.extension.ExtensionManager(namespace="drivers.plugins", invoke_on_load=True)
  17
  18     def load(self, drivers):
  19         plugin = self.determine_driver_type(drivers)
  20         ext = self.mgr[plugin]
  21         ext.obj.load(drivers)
  22         return True
  23
  24     def clean(self):
  25         self.mgr.map(self._clean)
  26         return True
  27
  28     def _clean(self, ext, *args, **kwargs):
  29         ext.obj.clean()
  30
  31     def get_all_supported_drivers(self):
  32         if not self.plugins:
  33             for ext_name in self.mgr.names():
  34                 ext = self.mgr[ext_name]
  35                 self.plugins[ext_name] = ext.obj.get_supported_drivers()
  36         return self.plugins
  37
  38     def determine_driver_type(self, drivers):
  39         s = set(drivers)
  40         for plugin, supported in self.get_all_supported_drivers().items():
  41             if not (s - set(supported)):
  42                 return plugin
  43         else:
  44             raise Exception('unspported drivers: %s' % drivers)