snaps/openstack/create_router.py

   1 # Copyright (c) 2017 Cable Television Laboratories, Inc. ("CableLabs")
   2 #                    and others.  All rights reserved.
   3 #
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at:
   7 #
   8 #     http://www.apache.org/licenses/LICENSE-2.0
   9 #
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15 import logging
  16
  17 from neutronclient.common.exceptions import NotFound, Unauthorized
  18
  19 from snaps.config.router import RouterConfig
  20 from snaps.openstack.openstack_creator import OpenStackNetworkObject
  21 from snaps.openstack.utils import neutron_utils
  22
  23 __author__ = 'spisarski'
  24
  25 logger = logging.getLogger('OpenStackNetwork')
  26
  27
  28 class OpenStackRouter(OpenStackNetworkObject):
  29     """
  30     Class responsible for managing a router in OpenStack
  31     """
  32
  33     def __init__(self, os_creds, router_settings):
  34         """
  35         Constructor - all parameters are required
  36         :param os_creds: The credentials to connect with OpenStack
  37         :param router_settings: The settings used to create a router object
  38                                 (must be an instance of the RouterConfig
  39                                 class)
  40         """
  41         super(self.__class__, self).__init__(os_creds)
  42
  43         if not router_settings:
  44             raise RouterCreationError('router_settings is required')
  45
  46         self.router_settings = router_settings
  47
  48         # Attributes instantiated on create()
  49         self.__router = None
  50         self.__internal_subnets = list()
  51         self.__internal_router_interface = None
  52
  53         # Dict where the port object is the key and any newly created router
  54         # interfaces are the value
  55         self.__ports = list()
  56
  57     def initialize(self):
  58         """
  59         Loads the existing router.
  60         :return: the Router domain object
  61         """
  62         super(self.__class__, self).initialize()
  63
  64         try:
  65             self.__router = neutron_utils.get_router(
  66                 self._neutron, router_settings=self.router_settings)
  67         except Unauthorized as e:
  68             logger.warn('Unable to lookup router with name %s - %s',
  69                         self.router_settings.name, e)
  70
  71         if self.__router:
  72             for internal_subnet_name in self.router_settings.internal_subnets:
  73                 internal_subnet = neutron_utils.get_subnet(
  74                     self._neutron, subnet_name=internal_subnet_name)
  75                 if internal_subnet:
  76                     self.__internal_subnets.append(internal_subnet)
  77                 else:
  78                     raise RouterCreationError(
  79                         'Subnet not found with name ' + internal_subnet_name)
  80
  81             for port_setting in self.router_settings.port_settings:
  82                 port = neutron_utils.get_port(
  83                     self._neutron, port_settings=port_setting)
  84                 if port:
  85                     self.__ports.append(port)
  86
  87         return self.__router
  88
  89     def create(self):
  90         """
  91         Responsible for creating the router.
  92         :return: the Router domain object
  93         """
  94         self.initialize()
  95
  96         if not self.__router:
  97             self.__router = neutron_utils.create_router(
  98                 self._neutron, self._os_creds, self.router_settings)
  99
 100             for internal_subnet_name in self.router_settings.internal_subnets:
 101                 internal_subnet = neutron_utils.get_subnet(
 102                     self._neutron, subnet_name=internal_subnet_name)
 103                 if internal_subnet:
 104                     self.__internal_subnets.append(internal_subnet)
 105                     if internal_subnet:
 106                         logger.debug('Adding router to subnet...')
 107                         router_intf = neutron_utils.add_interface_router(
 108                             self._neutron, self.__router,
 109                             subnet=internal_subnet)
 110                         self.__internal_router_interface = router_intf
 111                 else:
 112                     raise RouterCreationError(
 113                         'Subnet not found with name ' + internal_subnet_name)
 114
 115             for port_setting in self.router_settings.port_settings:
 116                 port = neutron_utils.get_port(
 117                     self._neutron, port_settings=port_setting)
 118                 logger.info(
 119                     'Retrieved port %s for router - %s', port_setting.name,
 120                     self.router_settings.name)
 121                 if port:
 122                     self.__ports.append(port)
 123
 124                 if not port:
 125                     port = neutron_utils.create_port(
 126                         self._neutron, self._os_creds, port_setting)
 127                     if port:
 128                         logger.info(
 129                             'Created port %s for router - %s',
 130                             port_setting.name,
 131                             self.router_settings.name)
 132                         self.__ports.append(port)
 133                         neutron_utils.add_interface_router(self._neutron,
 134                                                            self.__router,
 135                                                            port=port)
 136                     else:
 137                         raise RouterCreationError(
 138                             'Error creating port with name - '
 139                             + port_setting.name)
 140
 141         self.__router = neutron_utils.get_router_by_id(
 142             self._neutron, self.__router.id)
 143         return self.__router
 144
 145     def clean(self):
 146         """
 147         Removes and deletes all items created in reverse order.
 148         """
 149         for port in self.__ports:
 150             logger.info(
 151                 'Removing router interface from router %s and port %s',
 152                 self.router_settings.name, port.name)
 153             try:
 154                 neutron_utils.remove_interface_router(self._neutron,
 155                                                       self.__router, port=port)
 156             except NotFound:
 157                 pass
 158         self.__ports = list()
 159
 160         for internal_subnet in self.__internal_subnets:
 161             logger.info(
 162                 'Removing router interface from router %s and subnet %s',
 163                 self.router_settings.name, internal_subnet.name)
 164             try:
 165                 neutron_utils.remove_interface_router(self._neutron,
 166                                                       self.__router,
 167                                                       subnet=internal_subnet)
 168             except NotFound:
 169                 pass
 170         self.__internal_subnets = list()
 171
 172         if self.__router:
 173             logger.info('Removing router ' + self.router_settings.name)
 174             try:
 175                 neutron_utils.delete_router(self._neutron, self.__router)
 176             except NotFound:
 177                 pass
 178             self.__router = None
 179
 180     def get_router(self):
 181         """
 182         Returns the OpenStack router object
 183         :return:
 184         """
 185         return self.__router
 186
 187     def get_internal_router_interface(self):
 188         """
 189         Returns the OpenStack internal router interface object
 190         :return:
 191         """
 192         return self.__internal_router_interface
 193
 194
 195 class RouterCreationError(Exception):
 196     """
 197     Exception to be thrown when an router instance cannot be created
 198     """
 199
 200
 201 class RouterSettings(RouterConfig):
 202     """
 203     Class to hold the configuration settings required for creating OpenStack
 204     router objects
 205     deprecated
 206     """
 207
 208     def __init__(self, **kwargs):
 209         from warnings import warn
 210         warn('Use snaps.config.router.RouterConfig instead',
 211              DeprecationWarning)
 212         super(self.__class__, self).__init__(**kwargs)