150 lines
4.2 KiB
Python
150 lines
4.2 KiB
Python
# Copyright 2016 Huawei Technologies Co.,LTD.
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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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"""
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Mapping of bare metal instance states.
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Setting the instance `power_state` is handled by the engine's power
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synchronization thread. Based on the power state retrieved from the
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hypervisor for the instance.
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"""
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from oslo_log import log as logging
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from mogan.common import fsm
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LOG = logging.getLogger(__name__)
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#################
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# Instance states
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#################
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""" Mapping of state-changing events that are PUT to the REST API
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This is a mapping of target states which are PUT to the API.
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This provides a reference set of supported actions, and in the future
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may be used to support renaming these actions.
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"""
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ACTIVE = 'active'
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""" The server is active """
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BUILDING = 'building'
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""" The server has not finished the original build process """
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DELETED = 'deleted'
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""" The server is permanently deleted """
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DELETING = 'deleting'
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""" The server has not finished the original delete process """
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ERROR = 'error'
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""" The server is in error """
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POWERING_ON = 'powering-on'
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""" The server is in powering on """
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POWERING_OFF = 'powering-off'
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""" The server is in powering off """
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REBOOTING = 'rebooting'
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""" The server is in rebooting """
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STOPPED = 'stopped'
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""" The server is powered off """
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REBUILDING = 'rebuilding'
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""" The server is in rebuilding process """
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STABLE_STATES = (ACTIVE, ERROR, DELETED, STOPPED)
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"""States that will not transition unless receiving a request."""
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UNSTABLE_STATES = (BUILDING, DELETING, POWERING_ON, POWERING_OFF, REBOOTING,
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REBUILDING)
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"""States that can be changed without external request."""
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#####################
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# State machine model
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#####################
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def on_exit(old_state, event):
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"""Used to log when a state is exited."""
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LOG.debug("Exiting old state '%s' in response to event '%s'",
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old_state, event)
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def on_enter(new_state, event):
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"""Used to log when entering a state."""
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LOG.debug("Entering new state '%s' in response to event '%s'",
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new_state, event)
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watchers = {}
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watchers['on_exit'] = on_exit
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watchers['on_enter'] = on_enter
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machine = fsm.FSM()
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# Add stable states
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for state in STABLE_STATES:
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machine.add_state(state, stable=True, **watchers)
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# Add build* states
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machine.add_state(BUILDING, target=ACTIVE, **watchers)
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# Add delete* states
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machine.add_state(DELETING, target=DELETED, **watchers)
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# Add rebuild* states
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machine.add_state(REBUILDING, target=ACTIVE, **watchers)
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# Add power on* states
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machine.add_state(POWERING_ON, target=ACTIVE, **watchers)
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# Add power off* states
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machine.add_state(POWERING_OFF, target=STOPPED, **watchers)
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# Add reboot* states
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machine.add_state(REBOOTING, target=ACTIVE, **watchers)
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# from active* states
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machine.add_transition(ACTIVE, REBUILDING, 'rebuild')
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machine.add_transition(ACTIVE, POWERING_OFF, 'stop')
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machine.add_transition(ACTIVE, REBOOTING, 'reboot')
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machine.add_transition(ACTIVE, DELETING, 'delete')
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# from stopped* states
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machine.add_transition(STOPPED, POWERING_ON, 'start')
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machine.add_transition(STOPPED, REBUILDING, 'rebuild')
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machine.add_transition(STOPPED, DELETING, 'delete')
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# from error* states
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machine.add_transition(ERROR, DELETING, 'delete')
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# from *ing states
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machine.add_transition(BUILDING, ACTIVE, 'done')
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machine.add_transition(DELETING, DELETED, 'done')
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machine.add_transition(REBUILDING, ACTIVE, 'done')
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machine.add_transition(POWERING_ON, ACTIVE, 'done')
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machine.add_transition(POWERING_OFF, STOPPED, 'done')
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machine.add_transition(REBOOTING, ACTIVE, 'done')
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# All unstable states are allowed to transition to ERROR and DELETING
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for state in UNSTABLE_STATES:
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machine.add_transition(state, ERROR, 'error')
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machine.add_transition(state, DELETING, 'delete')
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