Synnefo

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from optparse import make_option

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

from synnefo import settings

import datetime

from synnefo.db.models import Backend

from synnefo.logic.backend import update_resources

class Command(BaseCommand):

    can_import_settings = True

    help = "Update backend statistics, which are used for instance allocation."

    output_transaction = True  # The management command runs inside

                               # an SQL transaction

    option_list = BaseCommand.option_list + (

        make_option('--backend-id', dest='backend_id',

                   help="Update statistics of only this backend"),

        make_option('--older-than', dest='older_than', metavar="MINUTES",

                   help="Update only backends that have not been updated for\

                   MINUTES. Set to 0 to force update."),

        make_option('--include-drained', dest='drained',

                    default=False,

                    action='store_true',

                    help="Also update statistics of drained backends")

        )

    def handle(self, **options):

        if options['backend_id']:

            try:

                backend_id = int(options['backend_id'])

                backends = [Backend.objects.get(id=backend_id)]

            except ValueError:

                raise CommandError("Wrong backend ID")

            except Backend.DoesNotExist:

                raise CommandError("Backend not found in DB")

        else:

            backends = Backend.objects.filter(offline=False)

        if not options['drained']:

            backends = backends.filter(drained=False)

        now = datetime.datetime.now()

        if options['older_than'] is not None:

            minutes = int(options['older_than'])

        else:

            minutes = settings.BACKEND_REFRESH_MIN

        delta = datetime.timedelta(minutes=minutes)

        for b in backends:

            if now > b.updated + delta:

                update_resources(b)

                print 'Successfully updated backend with id: %d' % b.id

            else:

                print 'Backend %d does not need update' % b.id