Synnefo

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from optparse import make_option

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

from django.utils import simplejson as json

from snf_django.lib.db.transaction import commit_on_success_strict

from astakos.im.register import add_service, ServiceException

from astakos.im.models import Component

from ._common import read_from_file

class Command(BaseCommand):

    help = "Register services"

    option_list = BaseCommand.option_list + (

        make_option('--json',

                    dest='json',

                    metavar='<json.file>',

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

    )

    @commit_on_success_strict()

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

        json_file = options['json']

        if not json_file:

            m = "Expecting option --json."

            raise CommandError(m)

        else:

            data = read_from_file(json_file)

            m = ('Input should be a JSON dict mapping service names '

                 'to definitions.')

            try:

                data = json.loads(data)

            except json.JSONDecodeError:

                raise CommandError(m)

            if not isinstance(data, dict):

                raise CommandError(m)

        self.add_services(data)

    def add_services(self, data):

        write = self.stdout.write

        output = []

        for name, service_dict in data.iteritems():

            try:

                component_name = service_dict['component']

                service_type = service_dict['type']

                endpoints = service_dict['endpoints']

            except KeyError:

                raise CommandError('Malformed service definition.')

            try:

                component = Component.objects.get(name=component_name)

            except Component.DoesNotExist:

                m = "Component '%s' is not registered." % component_name

                raise CommandError(m)

            try:

                existed = add_service(component, name, service_type, endpoints)

            except ServiceException as e:

                raise CommandError(e.message)

            m = "%s service %s.\n" % ("Updated" if existed else "Added", name)

            output.append(m)

        for line in output:

            write(line)