vmware-nsx/vmware_nsx/common/managers.py
Gary Kotton 792a6a0103 NSX TVD: V, T and simple DVS Coexist in the same plugin
Introduce a plugin that can work with all of the VC and NSX
offerings under the same umbrella of a single plugin.

Co-Authored-By: Adit Sarfaty <asarfaty@vmware.com>

Change-Id: I0449d64e3cf79b7a3a846dacba95e8854d53bdf8
2017-12-17 01:31:43 -08:00

136 lines
5.8 KiB
Python

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