Synnefo

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from optparse import make_option

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

from synnefo.management.common import get_backend, check_backend_credentials

class Command(BaseCommand):

    output_transaction = True

    args = "<backend ID>"

    help = "Modify a backend"

    option_list = BaseCommand.option_list + (

        make_option('--clustername',

            dest='clustername',

            help="Set backend's clustername"),

        make_option('--port',

            dest='port',

            help="Set backend's port"),

        make_option('--username',

            dest='username',

            help="Set backend'username"),

        make_option('--password',

            dest='password',

            help="Set backend's password"),

        make_option('--drained',

            dest='drained',

            action='store_true',

            help="Set the backend as drained to exclude from allocation "\

                 "operations"),

        make_option('--no-drained',

            dest='drained',

            action='store_false'),

        make_option('--offline',

            dest='offline',

            action='store_true',

            help="Set the backend as offline to not communicate in order "\

                 "to avoid delays"),

        make_option('--no-offline',

            dest='offline',

            action='store_false')

        )

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

        if len(args) != 1:

            raise CommandError("Please provide a backend ID")

        backend = get_backend(args[0])

        # Ensure fields correspondence with options and Backend model

        fields = ('clustername', 'port', 'username', 'password', 'drained',

                  'offline')

        for field in fields:

            value = options.get(field)

            if value is not None:

                backend.__setattr__(field, value)

        credentials = ('clustername', 'port', 'username', 'password')

        for field in credentials:

            if options.get(field):

                # check credentials, if any of them changed!

                check_backend_credentials(backend.clustername, backend.port,

                                          backend.username, backend.password)

                return

        backend.save()