Synnefo

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from optparse import make_option

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

from django.db import transaction

from snf_django.management.utils import pprint_table

from astakos.im.models import Component, AstakosUser

from astakos.im.quotas import service_get_quotas, SYSTEM

from astakos.im.functions import count_pending_app

import astakos.quotaholder_app.callpoint as qh

import astakos.quotaholder_app.exception as qh_exception

class Command(BaseCommand):

    help = """Reconcile resource usage of Quotaholder with Astakos DB.

    Detect unsynchronized usage between Quotaholder and Astakos DB resources

    and synchronize them if specified so.

    """

    option_list = BaseCommand.option_list + (

        make_option("--userid", dest="userid",

                    default=None,

                    help="Reconcile resources only for this user"),

        make_option("--fix", dest="fix",

                    default=False,

                    action="store_true",

                    help="Synchronize Quotaholder with Astakos DB."),

        make_option("--force",

                    default=False,

                    action="store_true",

                    help="Override Quotaholder. Force Quotaholder to impose"

                         " the quota, independently of their value.")

    )

    @transaction.commit_on_success

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

        write = self.stderr.write

        force = options['force']

        userid = options['userid']

        try:

            astakos = Component.objects.get(name="astakos")

        except Component.DoesNotExist:

            raise CommandError("Component 'astakos' not found.")

        query = [userid] if userid is not None else None

        qh_holdings = service_get_quotas(astakos, query)

        if userid is None:

            users = AstakosUser.objects.accepted()

        else:

            try:

                user = AstakosUser.objects.get(uuid=userid)

            except AstakosUser.DoesNotExist:

                raise CommandError("There is no user with uuid '%s'." % userid)

            if not user.is_accepted():

                raise CommandError("%s is not an accepted user." % userid)

            users = [user]

        db_holdings = count_pending_app(users)

        pending_exists = False

        unknown_user_exists = False

        unsynced = []

        for user in users:

            uuid = user.uuid

            db_value = db_holdings.get(uuid, 0)

            try:

                qh_all = qh_holdings[uuid]

            except KeyError:

                write("User '%s' does not exist in Quotaholder!\n" % uuid)

                unknown_user_exists = True

                continue

            # Assuming only one source

            system_qh = qh_all.get(SYSTEM, {})

            # Assuming only one resource

            resource = 'astakos.pending_app'

            try:

                qh_values = system_qh[resource]

                qh_value = qh_values['usage']

                qh_pending = qh_values['pending']

            except KeyError:

                write("Resource '%s' does not exist in Quotaholder"

                      " for user '%s'!\n" % (resource, uuid))

                continue

            if qh_pending:

                write("Pending commission. User '%s', resource '%s'.\n" %

                      (uuid, resource))

                pending_exists = True

                continue

            if db_value != qh_value:

                data = (uuid, resource, db_value, qh_value)

                unsynced.append(data)

        headers = ("User", "Resource", "Astakos", "Quotaholder")

        if unsynced:

            pprint_table(self.stdout, unsynced, headers)

            if options["fix"]:

                provisions = map(create_provision, unsynced)

                try:

                    s = qh.issue_commission('astakos', provisions,

                                            name='RECONCILE', force=force)

                except qh_exception.NoCapacityError:

                    write("Reconciling failed because a limit has been "

                          "reached. Use --force to ignore the check.\n")

                    return

                qh.resolve_pending_commission('astakos', s)

                write("Fixed unsynced resources\n")

        if pending_exists:

            write("Found pending commissions. "

                  "This is probably a bug. Please report.\n")

        elif not (unsynced or unknown_user_exists):

            write("Everything in sync.\n")

def create_provision(provision_info):

    user, resource, db_value, qh_value = provision_info

    return (user, SYSTEM, resource), (db_value - qh_value)