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.management import utils

from astakos.im.models import Resource

from astakos.im.register import update_resources

from ._common import show_resource_value, 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('--default-quota',

                    metavar='<limit>',

                    help="Specify default base quota"),

        make_option('--default-quota-interactive',

                    action='store_true',

                    default=None,

                    help=("Prompt user to change default base quota. "

                          "If no resource is given, prompts for all "

                          "resources.")),

        make_option('--default-quota-from-file',

                    metavar='<limits_file.json>',

                    help=("Read default base quota from a file. "

                          "File should contain a json dict mapping resource "

                          "names to limits")),

        make_option('--unit-style',

                    default='mb',

                    help=("Specify display unit for resource values "

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

        make_option('--allow-in-projects',

                    metavar='True|False',

                    help=("Specify whether to allow this resource "

                          "in projects.")),

    )

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

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

        actions = {

            'default_quota': self.change_limit,

            'default_quota_interactive': self.change_interactive,

            'default_quota_from_file': self.change_from_file,

            'allow_in_projects': self.set_allow_in_projects,

        }

        opts = [(key, value)

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

                if key in actions and value is not None]

        if len(opts) != 1:

            raise CommandError("Please provide exactly one of the options: "

                               "--default-quota, --default-quota-interactive, "

                               "--default-quota-from-file, "

                               "--allow-in-projects.")

        self.unit_style = options['unit_style']

        check_style(self.unit_style)

        key, value = opts[0]

        action = actions[key]

        action(resource_name, value)

    def set_allow_in_projects(self, resource_name, allow):

        if resource_name is None:

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

        try:

            allow = utils.parse_bool(allow)

        except ValueError:

            raise CommandError("Expecting a boolean value.")

        resource = self.get_resource(resource_name)

        resource.allow_in_projects = allow

        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_limit(self, resource_name, limit):

        if resource_name is None:

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

        resource = self.get_resource(resource_name)

        self.change_resource_limit(resource, limit)

    def change_from_file(self, resource_name, filename):

        with open(filename) as file_data:

            try:

                config = json.load(file_data)

            except json.JSONDecodeError:

                raise CommandError("Malformed JSON file.")

            if not isinstance(config, dict):

                raise CommandError("Malformed JSON file.")

            self.change_with_conf(resource_name, config)

    def change_with_conf(self, resource_name, config):

        if resource_name is None:

            resources = Resource.objects.all().select_for_update()

        else:

            resources = [self.get_resource(resource_name)]

        updates = []

        for resource in resources:

            limit = config.get(resource.name)

            if limit is not None:

                limit = self.parse_limit(limit)

                updates.append((resource, limit))

        if updates:

            update_resources(updates)

    def change_interactive(self, resource_name, _placeholder):

        if resource_name is None:

            resources = Resource.objects.all().select_for_update()

        else:

            resources = [self.get_resource(resource_name)]

        updates = []

        for resource in resources:

            self.stdout.write("Resource '%s' (%s)\n" %

                              (resource.name, resource.desc))

            value = show_resource_value(resource.uplimit, resource.name,

                                        self.unit_style)

            self.stdout.write("Current limit: %s\n" % value)

            while True:

                self.stdout.write("New limit (leave blank to keep current): ")

                response = raw_input()

                if response == "":

                    break

                else:

                    try:

                        value = units.parse(response)

                    except units.ParseError:

                        continue

                    updates.append((resource, value))

                    break

        if updates:

            self.stdout.write("Updating...\n")

            update_resources(updates)

    def parse_limit(self, limit):

        try:

            if isinstance(limit, (int, long)):

                return limit

            if isinstance(limit, basestring):

                return units.parse(limit)

            raise units.ParseError()

        except units.ParseError:

            m = ("Limit should be an integer, optionally followed by a unit,"

                 " or 'inf'.")

            raise CommandError(m)

    def change_resource_limit(self, resource, limit):

        limit = self.parse_limit(limit)

        update_resources([(resource, limit)])