testsuites/vstf/vstf_scripts/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
  15     def __init__(self):
  16         self.plugins = {}
  17         self.mgr = stevedore.extension.ExtensionManager(
  18             namespace="drivers.plugins", invoke_on_load=True)
  19
  20     def load(self, drivers):
  21         plugin = self.determine_driver_type(drivers)
  22         ext = self.mgr[plugin]
  23         ext.obj.load(drivers)
  24         return True
  25
  26     def clean(self):
  27         self.mgr.map(self._clean)
  28         return True
  29
  30     def _clean(self, ext, *args, **kwargs):
  31         ext.obj.clean()
  32
  33     def get_all_supported_drivers(self):
  34         if not self.plugins:
  35             for ext_name in self.mgr.names():
  36                 ext = self.mgr[ext_name]
  37                 self.plugins[ext_name] = ext.obj.get_supported_drivers()
  38         return self.plugins
  39
  40     def determine_driver_type(self, drivers):
  41         s = set(drivers)
  42         for plugin, supported in self.get_all_supported_drivers().items():
  43             if not (s - set(supported)):
  44                 return plugin
  45         else:
  46             raise Exception('unspported drivers: %s' % drivers)