Synnefo

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from optparse import make_option

from django.core.management.base import BaseCommand, CommandError

from synnefo.management import common

from synnefo.db.models import VirtualMachine, Network, Flavor

from synnefo.logic.utils import id_from_network_name, id_from_instance_name

from synnefo.logic.backend import wait_for_job

from synnefo.logic.rapi import GanetiApiError

from synnefo.api.util import allocate_public_address

import sys

HELP_MSG = """

Import an existing Ganeti instance into Synnefo, with the attributes specified

by the command line options. In order to be imported, the instance will be

turned off, renamed and then turned on again.

Importing an instance will fail, if the instance has NICs that are connected to

a network not belonging to Synnefo. You can either manually modify the instance

or use --new-nics option, that will remove all old NICs, and create a new one

connected to a public network of Synnefo.

"""

class Command(BaseCommand):

    help = "Import an existing Ganeti VM into Synnefo." + HELP_MSG

    args = "<ganeti_instance_name>"

    output_transaction = True

    option_list = BaseCommand.option_list + (

        make_option(

            "--backend-id",

            dest="backend_id",

            help="Unique identifier of the Ganeti backend that"

                 " hosts the VM. Use snf-manage backend-list to"

                 " find out available backends."),

        make_option(

            "--user-id",

            dest="user_id",

            help="Unique identifier of the owner of the server"),

        make_option(

            "--image-id",

            dest="image_id",

            default=None,

            help="Unique identifier of the image."

                 " Use snf-manage image-list to find out"

                 " available images."),

        make_option(

            "--flavor-id",

            dest="flavor_id",

            help="Unique identifier of the flavor"

                 " Use snf-manage flavor-list to find out"

                 " available flavors."),

        make_option(

            "--new-nics",

            dest='new_nics',

            default=False,

            action="store_true",

            help="Remove old NICs of instance, and create"

                 " a new NIC connected to a public network of"

                 " Synnefo.")

    )

    REQUIRED = ("user-id", "backend-id", "image-id", "flavor-id")

    def handle(self, *args, **options):

        if len(args) < 1:

            raise CommandError("Please specify a Ganeti instance")

        instance_name = args[0]

        try:

            id_from_instance_name(instance_name)

            raise CommandError("%s is already a synnefo instance")

        except:

            pass

        user_id = options['user_id']

        backend_id = options['backend_id']

        image_id = options['image_id']

        flavor_id = options['flavor_id']

        new_public_nic = options['new_nics']

        for field in self.REQUIRED:

            if not locals()[field.replace("-", "_")]:

                raise CommandError(field + " is mandatory")

        import_server(instance_name, backend_id, flavor_id, image_id, user_id,

                      new_public_nic, self.stdout)

def import_server(instance_name, backend_id, flavor_id, image_id, user_id,

                  new_public_nic, stream=sys.stdout):

    flavor = common.get_flavor(flavor_id)

    backend = common.get_backend(backend_id)

    backend_client = backend.get_client()

    try:

        instance = backend_client.GetInstance(instance_name)

    except GanetiApiError as e:

        if e.code == 404:

            raise CommandError("Instance %s does not exist in backend %s"

                               % (instance_name, backend))

        else:

            raise CommandError("Unexpected error" + str(e))

    if new_public_nic:

        remove_instance_nics(instance, backend_client,

                             stream=stream)

        (network, address) = allocate_public_address(backend)

        if address is None:

            raise CommandError("Can not allocate a public address."

                               " No available public network.")

        nic = {'ip': address, 'network': network.backend_id}

        add_public_nic(instance_name, nic, backend_client,

                       stream=stream)

    else:

        check_instance_nics(instance)

    shutdown_instance(instance, backend_client, stream=stream)

    # Create the VM in DB

    stream.write("Creating VM entry in DB\n")

    vm = VirtualMachine.objects.create(name=instance_name,

                                       backend=backend,

                                       userid=user_id,

                                       imageid=image_id,

                                       flavor=flavor)

    # Rename instance

    rename_instance(instance_name, vm.backend_vm_id, backend_client,

                    stream)

    # Startup instance

    startup_instance(vm.backend_vm_id, backend_client, stream=stream)

    backend.put_client(backend_client)

    return

def flavor_from_instance(instance, flavor, stream=sys.stdout):

    beparams = instance['beparams']

    disk_sizes = instance['disk.sizes']

    if len(disk_sizes) != 1:

        stream.write("Instance has more than one disk.\n")

    disk = disk_sizes[0]

    disk_template = instance['disk_template']

    cpu = beparams['vcpus']

    ram = beparams['memory']

    return Flavor.objects.get_or_create(disk=disk, disk_template=disk_template,

                                        cpu=cpu, ram=ram)

def check_instance_nics(instance):

    instance_name = instance['name']

    networks = instance['nic.networks']

    try:

        networks = map(id_from_network_name, networks)

    except Network.InvalidBackendIdError:

        raise CommandError("Instance %s has NICs that do not belong to a"

                           " network belonging to synnefo. Either manually"

                           " modify the instance NICs or specify --new-nics"

                           " to clear the old NICs and create a new NIC to"

                           " a public network of synnefo." % instance_name)

def remove_instance_nics(instance, backend_client, stream=sys.stdout):

    instance_name = instance['name']

    ips = instance['nic.ips']

    nic_indexes = xrange(0, len(ips))

    op = map(lambda x: ('remove', x, {}), nic_indexes)

    stream.write("Removing instance nics\n")

    op.reverse()

    jobid = backend_client.ModifyInstance(instance_name, nics=op)

    (status, error) = wait_for_job(backend_client, jobid)

    if status != 'success':

        raise CommandError("Can not rename instance: %s" % error)

def add_public_nic(instance_name, nic, backend_client, stream=sys.stdout):

    stream.write("Adding public NIC %s\n" % nic)

    jobid = backend_client.ModifyInstance(instance_name, nics=[('add', nic)])

    (status, error) = wait_for_job(backend_client, jobid)

    if status != 'success':

        raise CommandError("Can not rename instance: %s" % error)

def shutdown_instance(instance, backend_client, stream=sys.stdout):

    instance_name = instance['name']

    if instance['status'] != 'ADMIN_down':

        stream.write("Instance is not down. Shutting down"

                     " instance\n")

        jobid = backend_client.ShutdownInstance(instance_name)

        (status, error) = wait_for_job(backend_client, jobid)

        if status != 'success':

            raise CommandError("Can not shutdown instance: %s" % error)

def rename_instance(old_name, new_name, backend_client, stream=sys.stdout):

    stream.write("Renaming instance to %s\n" % new_name)

    jobid = backend_client.RenameInstance(old_name, new_name,

                                          ip_check=False, name_check=False)

    (status, error) = wait_for_job(backend_client, jobid)

    if status != 'success':

        raise CommandError("Can not rename instance: %s" % error)

def startup_instance(name, backend_client, stream=sys.stdout):

    stream.write("Starting instance %s\n" % name)

    jobid = backend_client.StartupInstance(name)

    (status, error) = wait_for_job(backend_client, jobid)

    if status != 'success':

        raise CommandError("Can not rename instance: %s" % error)