Synnefo

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from optparse import make_option

from django.core.management.base import CommandError

from synnefo.db.models import Backend, Network

from django.db.utils import IntegrityError

from synnefo.logic import backend as backend_mod

from snf_django.management.commands import SynnefoCommand

from synnefo.management.common import check_backend_credentials

from snf_django.management.utils import pprint_table

HYPERVISORS = [h[0] for h in Backend.HYPERVISORS]

class Command(SynnefoCommand):

    can_import_settings = True

    help = 'Create a new backend.'

    option_list = SynnefoCommand.option_list + (

        make_option('--clustername', dest='clustername'),

        make_option('--port', dest='port', default=5080),

        make_option('--user', dest='username'),

        make_option('--pass', dest='password'),

        make_option(

            '--no-check',

            action='store_false',

            dest='check',

            default=True,

            help="Do not perform credentials check and resources update"),

        make_option(

            '--hypervisor',

            dest='hypervisor',

            default=None,

            choices=HYPERVISORS,

            metavar="|".join(HYPERVISORS),

            help="The hypervisor that the Ganeti backend uses"),

        make_option(

            '--no-init', action='store_false',

            dest='init', default=True,

            help="Do not perform initialization of the Backend Model")

    )

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

        if len(args) > 0:

            raise CommandError("Command takes no arguments")

        clustername = options['clustername']

        port = options['port']

        username = options['username']

        password = options['password']

        if not (clustername and username and password):

            raise CommandError("Clustername, user and pass must be supplied")

        # Ensure correctness of credentials

        if options['check']:

            check_backend_credentials(clustername, port, username, password)

        self.create_backend(clustername, port, username, password,

                            hypervisor=options["hypervisor"],

                            initialize=options["init"])

    def create_backend(self, clustername, port, username, password,

                       hypervisor=None, initialize=True):

            kw = {"clustername": clustername,

                  "port": port,

                  "username": username,

                  "password": password,

                  "drained": True}

            if hypervisor:

                kw["hypervisor"] = hypervisor

            # Create the new backend in database

            try:

                backend = Backend.objects.create(**kw)

            except IntegrityError as e:

                raise CommandError("Cannot create backend: %s\n" % e)

            self.stderr.write("Successfully created backend with id %d\n"

                              % backend.id)

            if not initialize:

                return

            self.stderr.write("Retrieving backend resources:\n")

            resources = backend_mod.get_physical_resources(backend)

            attr = ['mfree', 'mtotal', 'dfree',

                    'dtotal', 'pinst_cnt', 'ctotal']

            table = [[str(resources[x]) for x in attr]]

            pprint_table(self.stdout, table, attr)

            backend_mod.update_backend_resources(backend, resources)

            backend_mod.update_backend_disk_templates(backend)

            networks = Network.objects.filter(deleted=False, public=True)

            if not networks:

                return

            self.stderr.write("Creating the following public:\n")

            headers = ("ID", "Name", 'IPv4 Subnet',

                       "IPv6 Subnet", 'Mac Prefix')

            table = []

            for net in networks:

                subnet4 = net.subnet4.cidr if net.subnet4 else None

                subnet6 = net.subnet6.cidr if net.subnet6 else None

                table.append((net.id, net.backend_id, subnet4,

                              subnet6, str(net.mac_prefix)))

            pprint_table(self.stdout, table, headers)

            for net in networks:

                net.create_backend_network(backend)

                result = backend_mod.create_network_synced(net, backend)

                if result[0] != "success":

                    self.stderr.write('\nError Creating Network %s: %s\n'

                                      % (net.backend_id, result[1]))

                else:

                    self.stderr.write('Successfully created Network: %s\n'

                                      % net.backend_id)

                result = backend_mod.connect_network_synced(network=net,

                                                            backend=backend)

                if result[0] != "success":

                    self.stderr.write('\nError Connecting Network %s: %s\n'

                                      % (net.backend_id, result[1]))

                else:

                    self.stderr.write('Successfully connected Network: %s\n'

                                      % net.backend_id)