Synnefo

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

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# Utility functions

from synnefo.db.models import VirtualMachine, Network

from snf_django.lib.api import faults

from django.conf import settings

from copy import deepcopy

from synnefo.util.text import uenc

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 network 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 id_from_nic_name(name):

    """Returns NIC's Django id, given a Ganeti's NIC name.

    """

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

        raise ValueError("Invalid NIC name: %s" % name)

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

    if not ns.isdigit():

        raise ValueError("Invalid NIC name: %s" % name)

    return int(ns)

def id_from_disk_name(name):

    """Returns Disk Django id, given a Ganeti's Disk name.

    """

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

        raise ValueError("Invalid Disk name: %s" % name)

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

    if not ns.isdigit():

        raise ValueError("Invalid Disk name: %s" % name)

    return int(ns)

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

    in_reboot = (r == "ACTIVE") and\

                (vm.backendopcode == "OP_INSTANCE_REBOOT") and\

                (vm.backendjobstatus in ("queued", "waiting", "running"))

    if in_reboot:

        return "REBOOT"

    in_resize = (r == "STOPPED") and\

                (vm.backendopcode == "OP_INSTANCE_MODIFY") and\

                (vm.task == "RESIZE") and \

                (vm.backendjobstatus in ("queued", "waiting", "running"))

    if in_resize:

        return "RESIZE"

    return r

TASK_STATE_FROM_ACTION = {

    "BUILD": "BUILDING",

    "START": "STARTING",

    "STOP": "STOPPING",

    "REBOOT": "REBOOTING",

    "DESTROY": "DESTROYING",

    "RESIZE": "RESIZING",

    "CONNECT": "CONNECTING",

    "DISCONNECT": "DISCONNECTING"}

def get_task_state(vm):

    if vm.task is None:

        return ""

    try:

        return TASK_STATE_FROM_ACTION[vm.task]

    except KeyError:

        return "UNKNOWN"

OPCODE_TO_ACTION = {

    "OP_INSTANCE_CREATE": "BUILD",

    "OP_INSTANCE_STARTUP": "START",

    "OP_INSTANCE_SHUTDOWN": "STOP",

    "OP_INSTANCE_REBOOT": "REBOOT",

    "OP_INSTANCE_REMOVE": "DESTROY"}

def get_action_from_opcode(opcode, job_fields):

    if opcode == "OP_INSTANCE_SET_PARAMS":

        nics = job_fields.get("nics")

        beparams = job_fields.get("beparams")

        if nics:

            try:

                nic_action = nics[0][0]

                if nic_action == "add":

                    return "CONNECT"

                elif nic_action == "remove":

                    return "DISCONNECT"

                else:

                    return None

            except:

                return None

        elif beparams:

            return "RESIZE"

        else:

            return None

    else:

        return OPCODE_TO_ACTION.get(opcode, None)

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

def check_name_length(name, max_length, message):

    """Check if a string is within acceptable value length"""

    if len(uenc(name)) > max_length:

        raise faults.BadRequest(message)