Synnefo

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from optparse import make_option

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

from django.db import transaction

from synnefo.db.models import Backend, Network

from django.db.utils import IntegrityError

from synnefo.logic.backend import (get_physical_resources,

                                   update_resources,

                                   create_network_synced,

                                   connect_network_synced)

from synnefo.management.common import check_backend_credentials, pprint_table

class Command(BaseCommand):

    can_import_settings = True

    help = 'Create a new backend.'

    output_transaction = True  # The management command runs inside

                               # an SQL transaction

    option_list = BaseCommand.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('--no-init', action='store_false',

            dest='init', default=True,

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

        )

    @transaction.commit_on_success

    def handle(self, **options):

        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)

        # Create the new backend in database

        try:

            backend = Backend.objects.create(clustername=clustername,

                                             port=port,

                                             username=username,

                                             password=password,

                                             drained=True)

        except IntegrityError as e:

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

        self.stdout.write('\nSuccessfully created backend with id %d\n' %

                          backend.id)

        if not options['check']:

            return

        self.stdout.write('\rRetrieving backend resources:\n')

        resources = 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)

        update_resources(backend, resources)

        if not options['init']:

            return

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

        if not networks:

            return

        self.stdout.write('\nCreating the follow networks:\n')

        headers = ('Name', 'Subnet', 'Gateway', 'Mac Prefix', 'Public')

        table = []

        for net in networks:

            table.append((net.backend_id, str(net.subnet), str(net.gateway),

                         str(net.mac_prefix), str(net.public)))

        pprint_table(self.stdout, table, headers)

        for net in networks:

            net.create_backend_network(backend)

            result = create_network_synced(net, backend)

            if result[0] != "success":

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

                                  (net.backend_id, result[1]))

            else:

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

                                 net.backend_id)

            result = connect_network_synced(network=net, backend=backend)

            if result[0] != "success":

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

                                  (net.backend_id, result[1]))

            else:

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

                                 net.backend_id)