Synnefo

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from optparse import make_option

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

from synnefo.db.models import Backend

class Command(BaseCommand):

    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',

            default=False,

            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',

            default=False,

            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")

        try:

            backend_id = int(args[0])

            backend = Backend.objects.get(id=backend_id)

        except ValueError:

            raise CommandError("Invalid backend ID")

        except Backend.DoesNotExist:

            raise CommandError("Backend not found in DB")

        # 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)

        backend.save()