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# Copyright 2014 Rackspace, Inc.
#
# 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_concurrency import lockutils
import stevedore
from ironic.common import exception
from ironic.conf import CONF
_dhcp_provider = None
EM_SEMAPHORE = 'dhcp_provider'
class DHCPFactory(object):
# NOTE(lucasagomes): Instantiate a stevedore.driver.DriverManager
# only once, the first time DHCPFactory.__init__
# is called.
_dhcp_provider = None
def __init__(self, **kwargs):
if not DHCPFactory._dhcp_provider:
DHCPFactory._set_dhcp_provider(**kwargs)
# NOTE(lucasagomes): Use lockutils to avoid a potential race in eventlet
# that might try to create two dhcp factories.
@classmethod
@lockutils.synchronized(EM_SEMAPHORE)
def _set_dhcp_provider(cls, **kwargs):
"""Initialize the dhcp provider
:raises: DHCPLoadError if the dhcp_provider cannot be loaded.
"""
# NOTE(lucasagomes): In case multiple greenthreads queue up on
# this lock before _dhcp_provider is initialized,
# prevent creation of multiple DriverManager.
if cls._dhcp_provider:
return
dhcp_provider_name = CONF.dhcp.dhcp_provider
try:
_extension_manager = stevedore.driver.DriverManager(
'ironic.dhcp',
dhcp_provider_name,
invoke_kwds=kwargs,
invoke_on_load=True)
except Exception as e:
raise exception.DHCPLoadError(
dhcp_provider_name=dhcp_provider_name, reason=e
)
cls._dhcp_provider = _extension_manager.driver
def update_dhcp(self, task, dhcp_opts, ports=None):
"""Send or update the DHCP BOOT options for this node.
:param task: A TaskManager instance.
:param dhcp_opts: this will be a list of dicts, e.g.
::
[{'opt_name': '67',
'opt_value': 'pxelinux.0'},
{'opt_name': '66',
'opt_value': '123.123.123.456'}]
:param ports: A dict with keys 'ports' and 'portgroups' and
dicts as values. Each dict has key/value pairs of the form
<ironic UUID>:<neutron port UUID>. e.g.
::
{'ports': {'port.uuid': vif.id},
'portgroups': {'portgroup.uuid': vif.id}}
If the value is None, will get the list of ports/portgroups
from the Ironic port/portgroup objects.
"""
self.provider.update_dhcp_opts(task, dhcp_opts, ports)
def clean_dhcp(self, task):
"""Clean up the DHCP BOOT options for this node.
:param task: A TaskManager instance.
"""
self.provider.clean_dhcp_opts(task)
@property
def provider(self):
return self._dhcp_provider
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