Synnefo

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from optparse import make_option

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

from snf_django.management import utils

from astakos.im.models import Resource

from astakos.im import register

from ._common import style_options, check_style, units

class Command(BaseCommand):

    args = "<resource name>"

    help = "Modify a resource's default base quota and boolean flags."

    option_list = BaseCommand.option_list + (

        make_option('--base-default',

                    metavar='<limit>',

                    help="Specify default base quota"),

        make_option('--unit-style',

                    default='mb',

                    help=("Specify display unit for resource values "

                          "(one of %s); defaults to mb") % style_options),

        make_option('--api-visible',

                    metavar='True|False',

                    help="Control visibility of this resource in the API"),

        make_option('--ui-visible',

                    metavar='True|False',

                    help="Control visibility of this resource in the UI"),

    )

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

        resource_name = args[0] if len(args) > 0 else None

        if resource_name is None:

            raise CommandError("Please provide a resource name.")

        resource = self.get_resource(resource_name)

        actions = {

            'base_default': self.change_base_default,

            'api_visible': self.set_api_visible,

            'ui_visible': self.set_ui_visible,

        }

        opts = [(key, value)

                for (key, value) in options.items()

                if key in actions and value is not None]

        self.unit_style = options['unit_style']

        check_style(self.unit_style)

        for key, value in opts:

            action = actions[key]

            action(resource, value)

    def set_api_visible(self, resource, allow):

        try:

            allow = utils.parse_bool(allow)

        except ValueError:

            raise CommandError("Expecting a boolean value.")

        resource.api_visible = allow

        if not allow and resource.ui_visible:

            self.stderr.write("Also resetting 'ui_visible' for consistency.\n")

            resource.ui_visible = False

        resource.save()

    def set_ui_visible(self, resource, allow):

        try:

            allow = utils.parse_bool(allow)

        except ValueError:

            raise CommandError("Expecting a boolean value.")

        resource.ui_visible = allow

        if allow and not resource.api_visible:

            self.stderr.write("Also setting 'api_visible' for consistency.\n")

            resource.api_visible = True

        resource.save()

    def get_resource(self, resource_name):

        try:

            return Resource.objects.select_for_update().get(name=resource_name)

        except Resource.DoesNotExist:

            raise CommandError("Resource %s does not exist."

                               % resource_name)

    def change_base_default(self, resource, limit):

        limit = self.parse_limit(limit)

        register.update_base_default(resource, limit)

    def parse_limit(self, limit):

        try:

            return units.parse(limit)

        except units.ParseError:

            m = ("Quota limit should be an integer, "

                 "optionally followed by a unit, or 'inf'.")

            raise CommandError(m)