2014-01-07 15:58:25 -08:00
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"""
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Copyright 2013 Rackspace, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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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,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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2014-01-21 17:14:40 -08:00
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from stevedore import enabled
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import structlog
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class BaseHardwareManager(object):
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@staticmethod
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def supports_hardware():
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return True
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2014-01-07 15:58:25 -08:00
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def get_primary_mac_address(self):
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return open('/sys/class/net/eth0/address', 'r').read().strip('\n')
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2014-01-21 17:14:40 -08:00
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def extension_supports_hardware(extension):
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return extension.plugin.supports_hardware()
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def load_hardware_manager():
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# The idea here is that there is an inheritance tree of Hardware Managers.
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# For example:
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#
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# BaseHardwareManager
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# / \
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# SmallServerManager LargeServerManager
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# / \ / \
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# v1 v2 v1 v2
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#
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# In this hierarchy, any manager can claim to support the hardware, but any
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# of its subclasses may supercede its claim. In cases where two managers
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# with no ancestral relationship both claim to support the hardware, the
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# result is undefined.
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#
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# NOTE(russellhaering): I don't know if this is actually a good idea, I
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# just want to be able to have a base manager which
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# tries to supply reasonable defaults, and be able to
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# override it simply by installing an appropriate
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# plugin.
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log = structlog.get_logger()
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selected_plugin = BaseHardwareManager
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extension_manager = enabled.EnabledExtensionManager(
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namespace='teeth_agent.hardware_managers',
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check_func=extension_supports_hardware)
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for extension in extension_manager:
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plugin = extension.plugin
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log.info('found qualified hardware manager',
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manager_name=plugin.__name__)
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if issubclass(plugin, selected_plugin):
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selected_plugin = plugin
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log.info('selected hardware manager',
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manager_name=selected_plugin.__name__)
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return selected_plugin()
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