root / logic / utils.py @ 5509b599
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# Utility functions
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#
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# Various functions
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#
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# Copyright 2010 Greek Research and Technology Network
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#
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from synnefo.db.models import VirtualMachine |
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from synnefo.logic import credits |
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import synnefo.settings as settings |
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def id_from_instance_name(name): |
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"""Returns VirtualMachine's Django id, given a ganeti machine name.
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Strips the ganeti prefix atm. Needs a better name!
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"""
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if not str(name).startswith(settings.BACKEND_PREFIX_ID): |
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raise VirtualMachine.InvalidBackendIdError(str(name)) |
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ns = str(name).lstrip(settings.BACKEND_PREFIX_ID)
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if not ns.isdigit(): |
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raise VirtualMachine.InvalidBackendIdError(str(name)) |
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return int(ns) |
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def get_rsapi_state(vm): |
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"""Returns the API state for a virtual machine
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The API state for an instance of VirtualMachine is derived as follows:
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* If the deleted flag has been set, it is "DELETED".
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* Otherwise, it is a mapping of the last state reported by Ganeti
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(vm.operstate) through the RSAPI_STATE_FROM_OPER_STATE dictionary.
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The last state reported by Ganeti is set whenever Ganeti reports
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successful completion of an operation. If Ganeti says an OP_INSTANCE_STARTUP
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operation succeeded, vm.operstate is set to "STARTED".
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* To support any transitional states defined by the API (only REBOOT for the time
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being) this mapping is amended with information reported by Ganeti regarding
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any outstanding operation. If an OP_INSTANCE_STARTUP had succeeded previously
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and an OP_INSTANCE_REBOOT has been reported as in progress, the API state is
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"REBOOT".
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"""
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try:
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r = VirtualMachine.RSAPI_STATE_FROM_OPER_STATE[vm.operstate] |
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except KeyError: |
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return "UNKNOWN" |
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# A machine is DELETED if the deleted flag has been set
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if vm.deleted:
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return "DELETED" |
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# A machine is in REBOOT if an OP_INSTANCE_REBOOT request is in progress
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if r == 'ACTIVE' and vm.backendopcode == 'OP_INSTANCE_REBOOT' and \ |
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vm.backendjobstatus in ('queued', 'waiting', 'running'): |
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return "REBOOT" |
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return r
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def update_state(vm, new_operstate): |
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"""Wrapper around updates of the VirtualMachine.operstate field"""
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# Call charge() unconditionally before any change of
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# internal state.
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credits.charge(vm) |
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vm.operstate = new_operstate |