Synnefo

# Copyright 2011 GRNET S.A. All rights reserved.

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# Utility functions

from synnefo.db.models import VirtualMachine, Network

from django.conf import settings

from copy import deepcopy

def id_from_instance_name(name):

    """Returns VirtualMachine's Django id, given a ganeti machine name.

    Strips the ganeti prefix atm. Needs a better name!

    """

    sname = str(name)

    if not sname.startswith(settings.BACKEND_PREFIX_ID):

        raise VirtualMachine.InvalidBackendIdError(sname)

    ns = sname.replace(settings.BACKEND_PREFIX_ID, "", 1)

    if not ns.isdigit():

        raise VirtualMachine.InvalidBackendIdError(sname)

    return int(ns)

def id_to_instance_name(id):

    return "%s%s" % (settings.BACKEND_PREFIX_ID, str(id))

def id_from_network_name(name):

    """Returns Network's Django id, given a ganeti machine name.

    Strips the ganeti prefix atm. Needs a better name!

    """

    if not str(name).startswith(settings.BACKEND_PREFIX_ID):

        raise Network.InvalidBackendIdError(str(name))

    ns = str(name).replace(settings.BACKEND_PREFIX_ID + 'net-', "", 1)

    if not ns.isdigit():

        raise Network.InvalidBackendIdError(str(name))

    return int(ns)

def id_to_network_name(id):

    return "%snet-%s" % (settings.BACKEND_PREFIX_ID, str(id))

def get_rsapi_state(vm):

    """Returns the API state for a virtual machine

    The API state for an instance of VirtualMachine is derived as follows:

    * If the deleted flag has been set, it is "DELETED".

    * Otherwise, it is a mapping of the last state reported by Ganeti

      (vm.operstate) through the RSAPI_STATE_FROM_OPER_STATE dictionary.

      The last state reported by Ganeti is set whenever Ganeti reports

      successful completion of an operation. If Ganeti says an

      OP_INSTANCE_STARTUP operation succeeded, vm.operstate is set to

      "STARTED".

    * To support any transitional states defined by the API (only REBOOT for

    the time being) this mapping is amended with information reported by Ganeti

    regarding any outstanding operation. If an OP_INSTANCE_STARTUP had

    succeeded previously and an OP_INSTANCE_REBOOT has been reported as in

    progress, the API state is "REBOOT".

    """

    try:

        r = VirtualMachine.RSAPI_STATE_FROM_OPER_STATE[vm.operstate]

    except KeyError:

        return "UNKNOWN"

    # A machine is DELETED if the deleted flag has been set

    if vm.deleted:

        return "DELETED"

    # A machine is in REBOOT if an OP_INSTANCE_REBOOT request is in progress

    if r == 'ACTIVE' and vm.backendopcode == 'OP_INSTANCE_REBOOT' and \

        vm.backendjobstatus in ('queued', 'waiting', 'running'):

        return "REBOOT"

    return r

def hide_pass(kw):

    if 'osparams' in kw and 'img_passwd' in kw['osparams']:

        kw1 = deepcopy(kw)

        kw1['osparams']['img_passwd'] = 'x' * 8

        return kw1

    else:

        return kw