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OpenStack Study: managers.py**** CubicPower OpenStack Study ****
# 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 import stevedore from neutron.common import exceptions as exc from neutron.extensions import portbindings from neutron.openstack.common import log from neutron.plugins.ml2.common import exceptions as ml2_exc from neutron.plugins.ml2 import driver_api as api LOG = log.getLogger(__name__)
**** CubicPower OpenStack Study **** class TypeManager(stevedore.named.NamedExtensionManager): """Manage network segment types using drivers."""
**** CubicPower OpenStack Study **** def __init__(self): # Mapping from type name to DriverManager self.drivers = {} LOG.info(_("Configured type driver names: %s"), cfg.CONF.ml2.type_drivers) super(TypeManager, self).__init__('neutron.ml2.type_drivers', cfg.CONF.ml2.type_drivers, invoke_on_load=True) LOG.info(_("Loaded type driver names: %s"), self.names()) self._register_types() self._check_tenant_network_types(cfg.CONF.ml2.tenant_network_types)
**** CubicPower OpenStack Study **** def _register_types(self): for ext in self: network_type = ext.obj.get_type() if network_type in self.drivers: LOG.error(_("Type driver '%(new_driver)s' ignored because type" " driver '%(old_driver)s' is already registered" " for type '%(type)s'"), {'new_driver': ext.name, 'old_driver': self.drivers[network_type].name, 'type': network_type}) else: self.drivers[network_type] = ext LOG.info(_("Registered types: %s"), self.drivers.keys())
**** CubicPower OpenStack Study **** def _check_tenant_network_types(self, types): self.tenant_network_types = [] for network_type in types: if network_type in self.drivers: self.tenant_network_types.append(network_type) else: msg = _("No type driver for tenant network_type: %s. " "Service terminated!") % network_type LOG.error(msg) raise SystemExit(msg) LOG.info(_("Tenant network_types: %s"), self.tenant_network_types)
**** CubicPower OpenStack Study **** def initialize(self): for network_type, driver in self.drivers.iteritems(): LOG.info(_("Initializing driver for type '%s'"), network_type) driver.obj.initialize()
**** CubicPower OpenStack Study **** def validate_provider_segment(self, segment): network_type = segment[api.NETWORK_TYPE] driver = self.drivers.get(network_type) if driver: driver.obj.validate_provider_segment(segment) else: msg = _("network_type value '%s' not supported") % network_type raise exc.InvalidInput(error_message=msg)
**** CubicPower OpenStack Study **** def reserve_provider_segment(self, session, segment): network_type = segment.get(api.NETWORK_TYPE) driver = self.drivers.get(network_type) driver.obj.reserve_provider_segment(session, segment)
**** CubicPower OpenStack Study **** def allocate_tenant_segment(self, session): for network_type in self.tenant_network_types: driver = self.drivers.get(network_type) segment = driver.obj.allocate_tenant_segment(session) if segment: return segment raise exc.NoNetworkAvailable()
**** CubicPower OpenStack Study **** def release_segment(self, session, segment): network_type = segment.get(api.NETWORK_TYPE) driver = self.drivers.get(network_type) driver.obj.release_segment(session, segment)
**** CubicPower OpenStack Study **** class MechanismManager(stevedore.named.NamedExtensionManager): """Manage networking mechanisms using drivers."""
**** CubicPower OpenStack Study **** def __init__(self): # Registered mechanism drivers, keyed by name. self.mech_drivers = {} # Ordered list of mechanism drivers, defining # the order in which the drivers are called. self.ordered_mech_drivers = [] LOG.info(_("Configured mechanism driver names: %s"), cfg.CONF.ml2.mechanism_drivers) super(MechanismManager, self).__init__('neutron.ml2.mechanism_drivers', cfg.CONF.ml2.mechanism_drivers, invoke_on_load=True, name_order=True) LOG.info(_("Loaded mechanism driver names: %s"), self.names()) self._register_mechanisms()
**** CubicPower OpenStack Study **** def _register_mechanisms(self): """Register all mechanism drivers. This method should only be called once in the MechanismManager constructor. """ for ext in self: self.mech_drivers[ext.name] = ext self.ordered_mech_drivers.append(ext) LOG.info(_("Registered mechanism drivers: %s"), [driver.name for driver in self.ordered_mech_drivers])
**** CubicPower OpenStack Study **** def initialize(self): # For ML2 to support bulk operations, each driver must support them self.native_bulk_support = True for driver in self.ordered_mech_drivers: LOG.info(_("Initializing mechanism driver '%s'"), driver.name) driver.obj.initialize() self.native_bulk_support &= getattr(driver.obj, 'native_bulk_support', True)
**** CubicPower OpenStack Study **** def _call_on_drivers(self, method_name, context, continue_on_failure=False): """Helper method for calling a method across all mechanism drivers. :param method_name: name of the method to call :param context: context parameter to pass to each method call :param continue_on_failure: whether or not to continue to call all mechanism drivers once one has raised an exception :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver call fails. """ error = False for driver in self.ordered_mech_drivers: try: getattr(driver.obj, method_name)(context) except Exception: LOG.exception( _("Mechanism driver '%(name)s' failed in %(method)s"), {'name': driver.name, 'method': method_name} ) error = True if not continue_on_failure: break if error: raise ml2_exc.MechanismDriverError( method=method_name )
**** CubicPower OpenStack Study **** def create_network_precommit(self, context): """Notify all mechanism drivers during network creation. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver create_network_precommit call fails. Called within the database transaction. If a mechanism driver raises an exception, then a MechanismDriverError is propogated to the caller, triggering a rollback. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("create_network_precommit", context)
**** CubicPower OpenStack Study **** def create_network_postcommit(self, context): """Notify all mechanism drivers after network creation. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver create_network_postcommit call fails. Called after the database transaction. If a mechanism driver raises an exception, then a MechanismDriverError is propagated to the caller, where the network will be deleted, triggering any required cleanup. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("create_network_postcommit", context)
**** CubicPower OpenStack Study **** def update_network_precommit(self, context): """Notify all mechanism drivers during network update. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver update_network_precommit call fails. Called within the database transaction. If a mechanism driver raises an exception, then a MechanismDriverError is propogated to the caller, triggering a rollback. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("update_network_precommit", context)
**** CubicPower OpenStack Study **** def update_network_postcommit(self, context): """Notify all mechanism drivers after network update. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver update_network_postcommit call fails. Called after the database transaction. If a mechanism driver raises an exception, then a MechanismDriverError is propagated to the caller, where an error is returned to the user. The user is expected to take the appropriate action, whether by retrying the call or deleting the network. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("update_network_postcommit", context)
**** CubicPower OpenStack Study **** def delete_network_precommit(self, context): """Notify all mechanism drivers during network deletion. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver delete_network_precommit call fails. Called within the database transaction. If a mechanism driver raises an exception, then a MechanismDriverError is propogated to the caller, triggering a rollback. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("delete_network_precommit", context)
**** CubicPower OpenStack Study **** def delete_network_postcommit(self, context): """Notify all mechanism drivers after network deletion. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver delete_network_postcommit call fails. Called after the database transaction. If any mechanism driver raises an error, then the error is logged but we continue to call every other mechanism driver. A MechanismDriverError is then reraised at the end to notify the caller of a failure. In general we expect the caller to ignore the error, as the network resource has already been deleted from the database and it doesn't make sense to undo the action by recreating the network. """ self._call_on_drivers("delete_network_postcommit", context, continue_on_failure=True)
**** CubicPower OpenStack Study **** def create_subnet_precommit(self, context): """Notify all mechanism drivers during subnet creation. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver create_subnet_precommit call fails. Called within the database transaction. If a mechanism driver raises an exception, then a MechanismDriverError is propogated to the caller, triggering a rollback. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("create_subnet_precommit", context)
**** CubicPower OpenStack Study **** def create_subnet_postcommit(self, context): """Notify all mechanism drivers after subnet creation. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver create_subnet_postcommit call fails. Called after the database transaction. If a mechanism driver raises an exception, then a MechanismDriverError is propagated to the caller, where the subnet will be deleted, triggering any required cleanup. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("create_subnet_postcommit", context)
**** CubicPower OpenStack Study **** def update_subnet_precommit(self, context): """Notify all mechanism drivers during subnet update. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver update_subnet_precommit call fails. Called within the database transaction. If a mechanism driver raises an exception, then a MechanismDriverError is propogated to the caller, triggering a rollback. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("update_subnet_precommit", context)
**** CubicPower OpenStack Study **** def update_subnet_postcommit(self, context): """Notify all mechanism drivers after subnet update. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver update_subnet_postcommit call fails. Called after the database transaction. If a mechanism driver raises an exception, then a MechanismDriverError is propagated to the caller, where an error is returned to the user. The user is expected to take the appropriate action, whether by retrying the call or deleting the subnet. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("update_subnet_postcommit", context)
**** CubicPower OpenStack Study **** def delete_subnet_precommit(self, context): """Notify all mechanism drivers during subnet deletion. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver delete_subnet_precommit call fails. Called within the database transaction. If a mechanism driver raises an exception, then a MechanismDriverError is propogated to the caller, triggering a rollback. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("delete_subnet_precommit", context)
**** CubicPower OpenStack Study **** def delete_subnet_postcommit(self, context): """Notify all mechanism drivers after subnet deletion. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver delete_subnet_postcommit call fails. Called after the database transaction. If any mechanism driver raises an error, then the error is logged but we continue to call every other mechanism driver. A MechanismDriverError is then reraised at the end to notify the caller of a failure. In general we expect the caller to ignore the error, as the subnet resource has already been deleted from the database and it doesn't make sense to undo the action by recreating the subnet. """ self._call_on_drivers("delete_subnet_postcommit", context, continue_on_failure=True)
**** CubicPower OpenStack Study **** def create_port_precommit(self, context): """Notify all mechanism drivers during port creation. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver create_port_precommit call fails. Called within the database transaction. If a mechanism driver raises an exception, then a MechanismDriverError is propogated to the caller, triggering a rollback. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("create_port_precommit", context)
**** CubicPower OpenStack Study **** def create_port_postcommit(self, context): """Notify all mechanism drivers of port creation. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver create_port_postcommit call fails. Called after the database transaction. Errors raised by mechanism drivers are left to propagate to the caller, where the port will be deleted, triggering any required cleanup. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("create_port_postcommit", context)
**** CubicPower OpenStack Study **** def update_port_precommit(self, context): """Notify all mechanism drivers during port update. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver update_port_precommit call fails. Called within the database transaction. If a mechanism driver raises an exception, then a MechanismDriverError is propogated to the caller, triggering a rollback. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("update_port_precommit", context)
**** CubicPower OpenStack Study **** def update_port_postcommit(self, context): """Notify all mechanism drivers after port update. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver update_port_postcommit call fails. Called after the database transaction. If a mechanism driver raises an exception, then a MechanismDriverError is propagated to the caller, where an error is returned to the user. The user is expected to take the appropriate action, whether by retrying the call or deleting the port. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("update_port_postcommit", context)
**** CubicPower OpenStack Study **** def delete_port_precommit(self, context): """Notify all mechanism drivers during port deletion. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver delete_port_precommit call fails. Called within the database transaction. If a mechanism driver raises an exception, then a MechanismDriverError is propogated to the caller, triggering a rollback. There is no guarantee that all mechanism drivers are called in this case. """ self._call_on_drivers("delete_port_precommit", context)
**** CubicPower OpenStack Study **** def delete_port_postcommit(self, context): """Notify all mechanism drivers after port deletion. :raises: neutron.plugins.ml2.common.MechanismDriverError if any mechanism driver delete_port_postcommit call fails. Called after the database transaction. If any mechanism driver raises an error, then the error is logged but we continue to call every other mechanism driver. A MechanismDriverError is then reraised at the end to notify the caller of a failure. In general we expect the caller to ignore the error, as the port resource has already been deleted from the database and it doesn't make sense to undo the action by recreating the port. """ self._call_on_drivers("delete_port_postcommit", context, continue_on_failure=True)
**** CubicPower OpenStack Study **** def bind_port(self, context): """Attempt to bind a port using registered mechanism drivers. :param context: PortContext instance describing the port Called inside transaction context on session, prior to create_port_precommit or update_port_precommit, to attempt to establish a port binding. """ binding = context._binding LOG.debug(_("Attempting to bind port %(port)s on host %(host)s " "for vnic_type %(vnic_type)s with profile %(profile)s"), {'port': context._port['id'], 'host': binding.host, 'vnic_type': binding.vnic_type, 'profile': binding.profile}) for driver in self.ordered_mech_drivers: try: driver.obj.bind_port(context) if binding.segment: binding.driver = driver.name LOG.debug(_("Bound port: %(port)s, host: %(host)s, " "vnic_type: %(vnic_type)s, " "profile: %(profile)s" "driver: %(driver)s, vif_type: %(vif_type)s, " "vif_details: %(vif_details)s, " "segment: %(segment)s"), {'port': context._port['id'], 'host': binding.host, 'vnic_type': binding.vnic_type, 'profile': binding.profile, 'driver': binding.driver, 'vif_type': binding.vif_type, 'vif_details': binding.vif_details, 'segment': binding.segment}) return except Exception: LOG.exception(_("Mechanism driver %s failed in " "bind_port"), driver.name) binding.vif_type = portbindings.VIF_TYPE_BINDING_FAILED LOG.warning(_("Failed to bind port %(port)s on host %(host)s"), {'port': context._port['id'], 'host': binding.host})
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