Synnefo

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from optparse import make_option

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

from django.db.utils import IntegrityError

from django.utils import simplejson as json

from snf_django.lib.db.transaction import commit_on_success_strict

from astakos.im.resources import add_resource

from astakos.im.models import Service

class Command(BaseCommand):

    help = "Register service resources"

    option_list = BaseCommand.option_list + (

        make_option('--json',

                    dest='json',

                    metavar='<json.file>',

                    help="Load resource definitions from a json file"),

    )

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

        json_file = options['json']

        if not json_file:

            m = "Expecting option --json."

            raise CommandError(m)

        else:

            with open(json_file) as file_data:

                m = ('Input should be a JSON dict containing "service" '

                     'and "resource" keys.')

                try:

                    data = json.load(file_data)

                except json.JSONDecodeError:

                    raise CommandError(m)

                if not isinstance(data, dict):

                    raise CommandError(m)

                else:

                    try:

                        service = data['service']

                        resources = data['resources']

                    except KeyError:

                        raise CommandError(m)

        self.add_resources(service, resources)

    @commit_on_success_strict()

    def add_resources(self, service, resources):

        try:

            s = Service.objects.get(name=service)

        except Service.DoesNotExist:

            raise CommandError("Service '%s' is not registered." % (service))

        for resource in resources:

            if not isinstance(resource, dict):

                raise CommandError("Malformed resource dict.")

            r, exists = add_resource(s, resource)

            name = r.name

            if exists:

                m = "Resource '%s' updated in database.\n" % (name)

            else:

                m = ("Resource '%s' created in database with default "

                     "quota limit 0.\n" % (name))

            self.stdout.write(m)