Synnefo

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from django.core.management import CommandError

from synnefo.db.models import (Backend, VirtualMachine, Network,

                               Flavor, IPAddress, Subnet,

                               BridgePoolTable, MacPrefixPoolTable,

                               NetworkInterface)

from functools import wraps

from django.conf import settings

from snf_django.lib.api import faults

from synnefo.api import util

from synnefo.logic import backend as backend_mod

from synnefo.logic.rapi import GanetiApiError, GanetiRapiClient

from synnefo.logic.utils import (id_from_instance_name,

                                 id_from_network_name,

                                 id_from_nic_name)

from django.core.exceptions import ObjectDoesNotExist

import logging

log = logging.getLogger(__name__)

def format_vm_state(vm):

    if vm.operstate == "BUILD":

        return "BUILD(" + str(vm.buildpercentage) + "%)"

    else:

        return vm.operstate

RESOURCE_MAP = {

    "backend": Backend.objects,

    "flavor": Flavor.objects,

    "server": VirtualMachine.objects,

    "network": Network.objects,

    "subnet": Subnet.objects,

    "port": NetworkInterface.objects,

    "floating-ip": IPAddress.objects.filter(floating_ip=True)}

def get_resource(name, value, for_update=False):

    """Get object from DB based by it's ID

    Helper function for getting an object from DB by it's DB and raising

    appropriate command line errors if the object does not exist or the

    ID is invalid.

    """

    objects = RESOURCE_MAP[name]

    if name == "floating-ip":

        capital_name = "Floating IP"

    else:

        capital_name = name.capitalize()

    if isinstance(value, basestring) and name in ["server", "network", "port"]:

        if value.startswith(settings.BACKEND_PREFIX_ID):

            try:

                if name == "server":

                    value = id_from_instance_name(value)

                elif name == "network":

                    value = id_from_network_name(value)

                elif name == "port":

                    value = id_from_nic_name(value)

            except ValueError:

                raise CommandError("Invalid {} ID: {}".format(capital_name,

                                                              value))

    if for_update:

        objects = objects.select_for_update()

    try:

        return objects.get(id=value)

    except ObjectDoesNotExist:

        msg = ("{0} with ID {1} does not exist. Use {2}-list to find out"

               " available {2} IDs.")

        raise CommandError(msg.format(capital_name, value, name))

    except (ValueError, TypeError):

        raise CommandError("Invalid {} ID: {}".format(capital_name, value))

def get_image(image_id, user_id):

    if image_id:

        try:

            return util.get_image_dict(image_id, user_id)

        except faults.ItemNotFound:

            raise CommandError("Image with ID %s not found."

                               " Use snf-manage image-list to find"

                               " out available image IDs." % image_id)

    else:

        raise CommandError("image-id is mandatory")

def check_backend_credentials(clustername, port, username, password):

    try:

        client = GanetiRapiClient(clustername, port, username, password)

        # This command will raise an exception if there is no

        # write-access

        client.ModifyCluster()

    except GanetiApiError as e:

        raise CommandError(e)

    info = client.GetInfo()

    info_name = info['name']

    if info_name != clustername:

        raise CommandError("Invalid clustername value. Please use the"

                           " Ganeti Cluster name: %s" % info_name)

def convert_api_faults(func):

    @wraps(func)

    def wrapper(*args, **kwargs):

        try:

            return func(*args, **kwargs)

        except faults.Fault as e:

            raise CommandError(e.message)

    return wrapper

class Omit(object):

    pass

def wait_server_task(server, wait, stdout):

    jobID = server.task_job_id

    if jobID is None:

        return

    if wait:

        msg = "Issued job '%s'. Waiting to complete...\n"

        stdout.write(msg % jobID)

        client = server.get_client()

        wait_ganeti_job(client, jobID, stdout)

    else:

        msg = "Issued job '%s'.\n"

        stdout.write(msg % jobID)

def wait_ganeti_job(client, jobID, stdout):

    status, error = backend_mod.wait_for_job(client, jobID)

    if status == "success":

        stdout.write("Job finished successfully.\n")

    else:

        raise CommandError("Job failed! Error: %s\n" % error)

def pool_table_from_type(type_):

    if type_ == "mac-prefix":

        return MacPrefixPoolTable

    elif type_ == "bridge":

        return BridgePoolTable

    # elif type == "ip":

    #     return IPPoolTable

    else:

        raise ValueError("Invalid pool type")