Synnefo

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from optparse import make_option

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

from synnefo.db.models import Backend

from django.db.utils import IntegrityError

from synnefo.logic.backend import get_physical_resources, \

                                  update_resources, \

                                  create_client

from synnefo.util.rapi import GanetiApiError

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

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

        make_option('--drained', action='store_true',

                    dest='drained',default=False,

                    help="Set as drained to exclude from allocations"),

        make_option('--no-check', action='store_false',

                    dest='check', default=True,

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

        )

    def handle(self, **options):

        clustername = options['clustername']

        port= options['port']

        username = options['username']

        password = options['password']

        drained = options['drained']

        if not (clustername and username and password):

            raise CommandError("Clustername, username and password must be supplied")

        # Ensure correctness of credentials

        if options['check']:

            self.stdout.write('Checking connectivity and credentials.\n')

            try:

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

                # This command will raise an exception if there is no write-access

                client.ModifyCluster()

            except GanetiApiError as e:

                self.stdout.write('Check failed:\n%s\n' %e)

                return

            else:

                self.stdout.write('Check passed.\n')

        # Create the new backend in database

        try:

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

                                             port=port,

                                             username=username,

                                             password=password,

                                             drained=drained)

        except IntegrityError as e:

            self.stdout.write("Cannot create backend: %s\n" % e)

        else:

            if options['check']:

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

                resources = get_physical_resources(backend)

                attr = ['mfree', 'mtotal', 'dfree', 'dtotal', 'pinst_cnt', 'ctotal']

                for a in attr:

                    self.stdout.write(a + ' : ' + str(resources[a])+'\n')

                update_resources(backend, resources)

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

                              backend.id)