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Viewing changes to ironic/common/states.py

  • Committer: Package Import Robot
  • Author(s): James Page
  • Date: 2015-01-05 12:21:37 UTC
  • mfrom: (1.2.4)
  • Revision ID: package-import@ubuntu.com-20150105122137-171bqrdpcxqipunk
Tags: 2015.1~b1-0ubuntu1
* New upstream beta release:
  - d/control: Align version requirements with upstream release.
* d/watch: Update uversionmangle to deal with kilo beta versioning
  changes.
* d/control: Bumped Standards-Version to 3.9.6, no changes.

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ironic/common/states.py
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maintenance mode in this case.
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"""
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from ironic.common import fsm
 
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from ironic.openstack.common import log as logging
 
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LOG = logging.getLogger(__name__)
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#####################
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# Provisioning states
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"""
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REBUILD = 'rebuild'
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""" Node is currently being rebuilt. """
 
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""" Node is to be rebuilt.
 
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This is not used as a state, but rather as a "verb" when changing the node's
 
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provision_state via the REST API.
 
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"""
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##############
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REBOOT = 'rebooting'
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""" Node is rebooting. """
 
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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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machine.add_state(NOSTATE, **watchers)
 
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machine.add_state(ACTIVE, **watchers)
 
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machine.add_state(ERROR, **watchers)
 
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# Add deploy* states
 
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machine.add_state(DEPLOYDONE, target=ACTIVE, **watchers)
 
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machine.add_state(DEPLOYING, target=DEPLOYDONE, **watchers)
 
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machine.add_state(DEPLOYWAIT, **watchers)
 
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machine.add_state(DEPLOYFAIL, **watchers)
 
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# Add delete* states
 
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machine.add_state(DELETED, target=NOSTATE, **watchers)
 
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machine.add_state(DELETING, target=DELETED, **watchers)
 
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# From NOSTATE, a deployment may be started
 
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machine.add_transition(NOSTATE, DEPLOYING, 'deploy')
 
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# A deployment may fail
 
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machine.add_transition(DEPLOYING, DEPLOYFAIL, 'fail')
 
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# A failed deployment may be retried
 
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# ironic/conductor/manager.py:do_node_deploy()
 
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machine.add_transition(DEPLOYFAIL, DEPLOYING, 'rebuild')
 
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# A deployment may also wait on external callbacks
 
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machine.add_transition(DEPLOYING, DEPLOYWAIT, 'wait')
 
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machine.add_transition(DEPLOYWAIT, DEPLOYING, 'resume')
 
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# A deployment waiting on callback may time out
 
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machine.add_transition(DEPLOYWAIT, DEPLOYFAIL, 'fail')
 
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# A deployment may complete
 
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machine.add_transition(DEPLOYING, ACTIVE, 'done')
 
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# An active instance may be re-deployed
 
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# ironic/conductor/manager.py:do_node_deploy()
 
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machine.add_transition(ACTIVE, DEPLOYING, 'rebuild')
 
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# An active instance may be deleted
 
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# ironic/conductor/manager.py:do_node_tear_down()
 
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machine.add_transition(ACTIVE, DELETING, 'delete')
 
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# While a deployment is waiting, it may be deleted
 
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# ironic/conductor/manager.py:do_node_tear_down()
 
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machine.add_transition(DEPLOYWAIT, DELETING, 'delete')
 
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# A failed deployment may also be deleted
 
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# ironic/conductor/manager.py:do_node_tear_down()
 
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machine.add_transition(DEPLOYFAIL, DELETING, 'delete')
 
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# A delete may complete
 
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machine.add_transition(DELETING, NOSTATE, 'done')
 
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# These states can also transition to error
 
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machine.add_transition(NOSTATE, ERROR, 'error')
 
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machine.add_transition(DEPLOYING, ERROR, 'error')
 
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machine.add_transition(ACTIVE, ERROR, 'error')
 
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machine.add_transition(DELETING, ERROR, 'error')
 
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# An errored instance can be rebuilt
 
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# ironic/conductor/manager.py:do_node_deploy()
 
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machine.add_transition(ERROR, DEPLOYING, 'rebuild')
 
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# or deleted
 
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# ironic/conductor/manager.py:do_node_tear_down()
 
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machine.add_transition(ERROR, DELETING, 'delete')