151 lines
6.2 KiB
Python
151 lines
6.2 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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import abc
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import six
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from neutron.extensions import portbindings
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from neutron.openstack.common import log
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from neutron.plugins.ml2 import driver_api as api
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LOG = log.getLogger(__name__)
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@six.add_metaclass(abc.ABCMeta)
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class AgentMechanismDriverBase(api.MechanismDriver):
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"""Base class for drivers that attach to networks using an L2 agent.
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The AgentMechanismDriverBase provides common code for mechanism
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drivers that integrate the ml2 plugin with L2 agents. Port binding
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with this driver requires the driver's associated agent to be
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running on the port's host, and that agent to have connectivity to
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at least one segment of the port's network.
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MechanismDrivers using this base class must pass the agent type to
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__init__(), and must implement try_to_bind_segment_for_agent().
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"""
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def __init__(self, agent_type,
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supported_vnic_types=[portbindings.VNIC_NORMAL]):
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"""Initialize base class for specific L2 agent type.
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:param agent_type: Constant identifying agent type in agents_db
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:param supported_vnic_types: The binding:vnic_type values we can bind
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"""
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self.agent_type = agent_type
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self.supported_vnic_types = supported_vnic_types
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def initialize(self):
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pass
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def bind_port(self, context):
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LOG.debug(_("Attempting to bind port %(port)s on "
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"network %(network)s"),
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{'port': context.current['id'],
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'network': context.network.current['id']})
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vnic_type = context.current.get(portbindings.VNIC_TYPE,
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portbindings.VNIC_NORMAL)
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if vnic_type not in self.supported_vnic_types:
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LOG.debug(_("Refusing to bind due to unsupported vnic_type: %s"),
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vnic_type)
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return
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for agent in context.host_agents(self.agent_type):
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LOG.debug(_("Checking agent: %s"), agent)
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if agent['alive']:
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for segment in context.network.network_segments:
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if self.try_to_bind_segment_for_agent(context, segment,
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agent):
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LOG.debug(_("Bound using segment: %s"), segment)
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return
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else:
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LOG.warning(_("Attempting to bind with dead agent: %s"),
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agent)
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@abc.abstractmethod
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def try_to_bind_segment_for_agent(self, context, segment, agent):
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"""Try to bind with segment for agent.
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:param context: PortContext instance describing the port
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:param segment: segment dictionary describing segment to bind
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:param agent: agents_db entry describing agent to bind
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:returns: True iff segment has been bound for agent
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Called outside any transaction during bind_port() so that
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derived MechanismDrivers can use agent_db data along with
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built-in knowledge of the corresponding agent's capabilities
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to attempt to bind to the specified network segment for the
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agent.
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If the segment can be bound for the agent, this function must
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call context.set_binding() with appropriate values and then
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return True. Otherwise, it must return False.
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"""
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@six.add_metaclass(abc.ABCMeta)
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class SimpleAgentMechanismDriverBase(AgentMechanismDriverBase):
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"""Base class for simple drivers using an L2 agent.
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The SimpleAgentMechanismDriverBase provides common code for
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mechanism drivers that integrate the ml2 plugin with L2 agents,
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where the binding:vif_type and binding:vif_details values are the
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same for all bindings. Port binding with this driver requires the
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driver's associated agent to be running on the port's host, and
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that agent to have connectivity to at least one segment of the
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port's network.
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MechanismDrivers using this base class must pass the agent type
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and the values for binding:vif_type and binding:vif_details to
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__init__(), and must implement check_segment_for_agent().
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"""
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def __init__(self, agent_type, vif_type, vif_details,
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supported_vnic_types=[portbindings.VNIC_NORMAL]):
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"""Initialize base class for specific L2 agent type.
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:param agent_type: Constant identifying agent type in agents_db
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:param vif_type: Value for binding:vif_type when bound
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:param vif_details: Dictionary with details for VIF driver when bound
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:param supported_vnic_types: The binding:vnic_type values we can bind
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"""
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super(SimpleAgentMechanismDriverBase, self).__init__(
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agent_type, supported_vnic_types)
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self.vif_type = vif_type
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self.vif_details = vif_details
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def try_to_bind_segment_for_agent(self, context, segment, agent):
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if self.check_segment_for_agent(segment, agent):
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context.set_binding(segment[api.ID],
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self.vif_type,
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self.vif_details)
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return True
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else:
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return False
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@abc.abstractmethod
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def check_segment_for_agent(self, segment, agent):
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"""Check if segment can be bound for agent.
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:param segment: segment dictionary describing segment to bind
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:param agent: agents_db entry describing agent to bind
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:returns: True iff segment can be bound for agent
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Called inside transaction during bind_port so that derived
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MechanismDrivers can use agent_db data along with built-in
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knowledge of the corresponding agent's capabilities to
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determine whether or not the specified network segment can be
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bound for the agent.
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"""
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