136 lines
5.8 KiB
Python
136 lines
5.8 KiB
Python
# Copyright (c) 2013 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from oslo_config import cfg
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from oslo_log import log
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from oslo_utils import excutils
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import stevedore
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LOG = log.getLogger(__name__)
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class ExtensionManager(stevedore.named.NamedExtensionManager):
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"""Manage extension drivers using drivers."""
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def __init__(self, extension_drivers=None):
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# Ordered list of extension drivers, defining
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# the order in which the drivers are called.
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self.ordered_ext_drivers = []
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if extension_drivers is None:
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extension_drivers = cfg.CONF.nsx_extension_drivers
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LOG.info("Configured extension driver names: %s",
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extension_drivers)
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super(ExtensionManager, self).__init__('vmware_nsx.extension_drivers',
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extension_drivers,
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invoke_on_load=True,
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name_order=True)
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LOG.info("Loaded extension driver names: %s", self.names())
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self._register_drivers()
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def _register_drivers(self):
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"""Register all extension drivers.
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This method should only be called once in the ExtensionManager
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constructor.
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"""
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for ext in self:
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self.ordered_ext_drivers.append(ext)
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LOG.info("Registered extension drivers: %s",
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[driver.name for driver in self.ordered_ext_drivers])
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def initialize(self):
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# Initialize each driver in the list.
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for driver in self.ordered_ext_drivers:
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LOG.info("Initializing extension driver '%s'", driver.name)
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driver.obj.initialize()
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def extension_aliases(self):
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exts = []
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for driver in self.ordered_ext_drivers:
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alias = driver.obj.extension_alias
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if alias:
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exts.append(alias)
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LOG.info("Got %(alias)s extension from driver '%(drv)s'",
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{'alias': alias, 'drv': driver.name})
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return exts
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def _call_on_ext_drivers(self, method_name, plugin_context, data, result):
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"""Helper method for calling a method across all extension drivers."""
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for driver in self.ordered_ext_drivers:
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try:
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getattr(driver.obj, method_name)(plugin_context, data, result)
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except Exception:
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with excutils.save_and_reraise_exception():
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LOG.info("Extension driver '%(name)s' failed in "
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"%(method)s",
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{'name': driver.name, 'method': method_name})
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def process_create_network(self, plugin_context, data, result):
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"""Notify all extension drivers during network creation."""
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self._call_on_ext_drivers("process_create_network", plugin_context,
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data, result)
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def process_update_network(self, plugin_context, data, result):
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"""Notify all extension drivers during network update."""
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self._call_on_ext_drivers("process_update_network", plugin_context,
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data, result)
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def process_create_subnet(self, plugin_context, data, result):
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"""Notify all extension drivers during subnet creation."""
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self._call_on_ext_drivers("process_create_subnet", plugin_context,
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data, result)
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def process_update_subnet(self, plugin_context, data, result):
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"""Notify all extension drivers during subnet update."""
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self._call_on_ext_drivers("process_update_subnet", plugin_context,
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data, result)
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def process_create_port(self, plugin_context, data, result):
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"""Notify all extension drivers during port creation."""
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self._call_on_ext_drivers("process_create_port", plugin_context,
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data, result)
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def process_update_port(self, plugin_context, data, result):
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"""Notify all extension drivers during port update."""
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self._call_on_ext_drivers("process_update_port", plugin_context,
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data, result)
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def _call_on_dict_driver(self, method_name, session, base_model, result):
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for driver in self.ordered_ext_drivers:
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try:
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getattr(driver.obj, method_name)(session, base_model, result)
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except Exception:
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LOG.error("Extension driver '%(name)s' failed in "
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"%(method)s",
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{'name': driver.name, 'method': method_name})
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raise
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def extend_network_dict(self, session, base_model, result):
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"""Notify all extension drivers to extend network dictionary."""
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self._call_on_dict_driver("extend_network_dict", session, base_model,
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result)
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def extend_subnet_dict(self, session, base_model, result):
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"""Notify all extension drivers to extend subnet dictionary."""
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self._call_on_dict_driver("extend_subnet_dict", session, base_model,
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result)
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def extend_port_dict(self, session, base_model, result):
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"""Notify all extension drivers to extend port dictionary."""
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self._call_on_dict_driver("extend_port_dict", session, base_model,
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result)
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