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, keystone_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, self._keystone,
  67                 router_settings=self.router_settings,
  68                 project_name=self._os_creds.project_name)
  69         except Unauthorized as e:
  70             logger.warn('Unable to lookup router with name %s - %s',
  71                         self.router_settings.name, e)
  72
  73         if self.__router:
  74             for internal_subnet_name in self.router_settings.internal_subnets:
  75                 internal_subnet = neutron_utils.get_subnet(
  76                     self._neutron, subnet_name=internal_subnet_name)
  77                 if internal_subnet:
  78                     self.__internal_subnets.append(internal_subnet)
  79                 else:
  80                     raise RouterCreationError(
  81                         'Subnet not found with name ' + internal_subnet_name)
  82
  83             for port_setting in self.router_settings.port_settings:
  84                 port = neutron_utils.get_port(
  85                     self._neutron, self._keystone, port_settings=port_setting,
  86                     project_name=self._os_creds.project_name)
  87                 if port:
  88                     self.__ports.append(port)
  89
  90         return self.__router
  91
  92     def create(self):
  93         """
  94         Responsible for creating the router.
  95         :return: the Router domain object
  96         """
  97         self.initialize()
  98
  99         if not self.__router:
 100             self.__router = neutron_utils.create_router(
 101                 self._neutron, self._os_creds, self.router_settings)
 102
 103             for internal_subnet_name in self.router_settings.internal_subnets:
 104                 internal_subnet = neutron_utils.get_subnet(
 105                     self._neutron, subnet_name=internal_subnet_name)
 106                 if internal_subnet:
 107                     self.__internal_subnets.append(internal_subnet)
 108                     if internal_subnet:
 109                         logger.debug('Adding router to subnet...')
 110                         router_intf = neutron_utils.add_interface_router(
 111                             self._neutron, self.__router,
 112                             subnet=internal_subnet)
 113                         self.__internal_router_interface = router_intf
 114                 else:
 115                     raise RouterCreationError(
 116                         'Subnet not found with name ' + internal_subnet_name)
 117
 118             for port_setting in self.router_settings.port_settings:
 119                 port = neutron_utils.get_port(
 120                     self._neutron, self._keystone, port_settings=port_setting,
 121                     project_name=self._os_creds.project_name)
 122                 logger.info(
 123                     'Retrieved port %s for router - %s', port_setting.name,
 124                     self.router_settings.name)
 125                 if port:
 126                     self.__ports.append(port)
 127
 128                 if not port:
 129                     port = neutron_utils.create_port(
 130                         self._neutron, self._os_creds, port_setting)
 131                     if port:
 132                         logger.info(
 133                             'Created port %s for router - %s',
 134                             port_setting.name,
 135                             self.router_settings.name)
 136                         self.__ports.append(port)
 137                         neutron_utils.add_interface_router(
 138                             self._neutron, self.__router, port=port)
 139                     else:
 140                         raise RouterCreationError(
 141                             'Error creating port with name - '
 142                             + port_setting.name)
 143
 144         self.__router = neutron_utils.get_router_by_id(
 145             self._neutron, self.__router.id)
 146         return self.__router
 147
 148     def clean(self):
 149         """
 150         Removes and deletes all items created in reverse order.
 151         """
 152         for port in self.__ports:
 153             logger.info(
 154                 'Removing router interface from router %s and port %s',
 155                 self.router_settings.name, port.name)
 156             try:
 157                 neutron_utils.remove_interface_router(self._neutron,
 158                                                       self.__router, port=port)
 159             except NotFound:
 160                 pass
 161         self.__ports = list()
 162
 163         for internal_subnet in self.__internal_subnets:
 164             logger.info(
 165                 'Removing router interface from router %s and subnet %s',
 166                 self.router_settings.name, internal_subnet.name)
 167             try:
 168                 neutron_utils.remove_interface_router(self._neutron,
 169                                                       self.__router,
 170                                                       subnet=internal_subnet)
 171             except NotFound:
 172                 pass
 173         self.__internal_subnets = list()
 174
 175         if self.__router:
 176             logger.info('Removing router ' + self.router_settings.name)
 177             try:
 178                 neutron_utils.delete_router(self._neutron, self.__router)
 179             except NotFound:
 180                 pass
 181             self.__router = None
 182
 183         super(self.__class__, self).clean()
 184
 185     def get_router(self):
 186         """
 187         Returns the OpenStack router object
 188         :return:
 189         """
 190         return self.__router
 191
 192     def get_internal_router_interface(self):
 193         """
 194         Returns the OpenStack internal router interface object
 195         :return:
 196         """
 197         return self.__internal_router_interface
 198
 199
 200 class RouterCreationError(Exception):
 201     """
 202     Exception to be thrown when an router instance cannot be created
 203     """
 204
 205
 206 class RouterSettings(RouterConfig):
 207     """
 208     Class to hold the configuration settings required for creating OpenStack
 209     router objects
 210     deprecated
 211     """
 212
 213     def __init__(self, **kwargs):
 214         from warnings import warn
 215         warn('Use snaps.config.router.RouterConfig instead',
 216              DeprecationWarning)
 217         super(self.__class__, self).__init__(**kwargs)