Synnefo

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# Reconcile VM state - Management Script

from django.core.management.base import NoArgsCommand

from synnefo.db.models import VirtualMachine

from django.conf import settings

from datetime import datetime, timedelta

from amqplib import client_0_8 as amqp

import time

import socket

import json

class Command(NoArgsCommand):

    help = 'Reconcile VM status with the backend'

    chan = None

    def open_channel(self):

        conn = None

        while conn == None:

            try:

                conn = amqp.Connection( host=settings.RABBIT_HOST,

                     userid=settings.RABBIT_USERNAME,

                     password=settings.RABBIT_PASSWORD,

                     virtual_host=settings.RABBIT_VHOST)

            except socket.error:

                time.sleep(1)

                pass

        self.chan = conn.channel()

    def handle_noargs(self, **options):

        now = datetime.now()

        last_update = timedelta(minutes = 30)

        not_updated = VirtualMachine.objects.filter(updated__lte = (now - last_update))

        all =  VirtualMachine.objects.all()

        to_update = all.count() / settings.RECONCILIATION_MIN

        vm_ids = map(lambda x: x.name,  VirtualMachine.objects.all()[:to_update])

        sent = False

        for vmid in vm_ids :

            while sent is False:

                try:

                    msg = dict(type = "reconciliate", vmid = vmid)

                    self.chan.basic_publish(json.dumps(msg),

                            exchange=settings.EXCHANGE_CRON,

                            routing_key="reconciliation.%s"%vmid)

                    sent = True

                except socket.error:

                    self.chan = self.open_channel()

                except Exception:

                    raise

        print "All: %d, To update: %d, Triggered update for: %s" % (all.count(), not_updated.count(), vm_ids)