Synnefo

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"""Reconciliation management command

Management command to reconcile the contents of the Synnefo DB with

the state of the Ganeti backend. See docstring on top of

logic/reconciliation.py for a description of reconciliation rules.

"""

import sys

from optparse import make_option

from django.conf import settings

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

from synnefo.db.models import VirtualMachine

from synnefo.logic import reconciliation, backend

from synnefo.util.rapi import GanetiRapiClient

class Command(BaseCommand):

    can_import_settings = True

    help = 'Reconcile contents of Synnefo DB with state of Ganeti backend'

    output_transaction = True  # The management command runs inside

                               # an SQL transaction

    option_list = BaseCommand.option_list + (

        make_option('--detect-stale', action='store_true', dest='detect_stale',

                    default=False, help='Detect stale VM entries in DB'),

        make_option('--detect-orphans', action='store_true',

                    dest='detect_orphans',

                    default=False, help='Detect orphan instances in Ganeti'),

        make_option('--detect-unsynced', action='store_true',

                    dest='detect_unsynced',

                    default=False, help='Detect unsynced operstate between ' +

                                        'DB and Ganeti'),

        make_option('--detect-all', action='store_true',

                    dest='detect_all',

                    default=False, help='Enable all --detect-* arguments'),

        make_option('--fix-stale', action='store_true', dest='fix_stale',

                    default=False, help='Fix (remove) stale DB entries in DB'),

        make_option('--fix-orphans', action='store_true', dest='fix_orphans',

                    default=False, help='Fix (remove) orphan Ganeti VMs'),

        make_option('--fix-unsynced', action='store_true', dest='fix_unsynced',

                    default=False, help='Fix server operstate in DB, set ' +

                                        'from Ganeti'),

        make_option('--fix-all', action='store_true', dest='fix_all',

                    default=False, help='Enable all --fix-* arguments'))

    def _process_args(self, options):

        keys_detect = [k for k in options.keys() if k.startswith('detect_')]

        keys_fix = [k for k in options.keys() if k.startswith('fix_')]

        if options['detect_all']:

            for kd in keys_detect:

                options[kd] = True

        if options['fix_all']:

            for kf in keys_fix:

                options[kf] = True

        if not reduce(lambda x, y: x or y,

                      map(lambda x: options[x], keys_detect)):

            raise CommandError("At least one of --detect-* must be specified")

        for kf in keys_fix:

            kd = kf.replace('fix_', 'detect_', 1)

            if (options[kf] and not options[kd]):

                raise CommandError("Cannot use --%s without corresponding "

                                   "--%s argument" % (kf, kd))

    def handle(self, **options):

        verbosity = int(options['verbosity'])

        self._process_args(options)

        D = reconciliation.get_servers_from_db()

        G = reconciliation.get_instances_from_ganeti()

        #

        # Detect problems

        #

        if options['detect_stale']:

            stale = reconciliation.stale_servers_in_db(D, G)

            if len(stale) > 0:

                print >> sys.stderr, "Found the following stale server IDs: "

                print "    " + "\n    ".join(

                    [str(x) for x in stale])

            elif verbosity == 2:

                print >> sys.stderr, "Found no stale server IDs in DB."

        if options['detect_orphans']:

            orphans = reconciliation.orphan_instances_in_ganeti(D, G)

            if len(orphans) > 0:

                print >> sys.stderr, "Found orphan Ganeti instances with IDs: "

                print "    " + "\n    ".join(

                    [str(x) for x in orphans])

            elif verbosity == 2:

                print >> sys.stderr, "Found no orphan Ganeti instances."

        if options['detect_unsynced']:

            unsynced = reconciliation.unsynced_operstate(D, G)

            if len(unsynced) > 0:

                print >> sys.stderr, "The operstate of the following server" \

                                     " IDs is out-of-sync:"

                print "    " + "\n    ".join(

                    ["%d is %s in DB, %s in Ganeti" %

                     (x[0], x[1], ('UP' if x[2] else 'DOWN'))

                     for x in unsynced])

            elif verbosity == 2:

                print >> sys.stderr, "The operstate of all servers is in sync."

        #

        # Then fix them

        #

        if options['fix_stale'] and len(stale) > 0:

            print >> sys.stderr, \

                "Simulating successful Ganeti removal for %d " \

                "servers in the DB:" % len(stale)

            for vm in VirtualMachine.objects.filter(pk__in=stale):

                backend.process_op_status(vm=vm, jobid=-0,

                    opcode='OP_INSTANCE_REMOVE', status='success',

                    logmsg='Reconciliation: simulated Ganeti event')

            print >> sys.stderr, "    ...done"

        if options['fix_orphans'] and len(orphans) > 0:

            print >> sys.stderr, \

                "Issuing OP_INSTANCE_REMOVE for %d Ganeti instances:" % \

                len(orphans)

            for id in orphans:

                rapi = GanetiRapiClient(*settings.GANETI_CLUSTER_INFO)

                rapi.DeleteInstance('%s%s' %

                                    (settings.BACKEND_PREFIX_ID, str(id)))

            print >> sys.stderr, "    ...done"

        if options['fix_unsynced'] and len(unsynced) > 0:

            print >> sys.stderr, "Setting the state of %d out-of-sync VMs:" % \

                len(unsynced)

            for id, db_state, ganeti_up in unsynced:

                vm = VirtualMachine.objects.get(pk=id)

                opcode = "OP_INSTANCE_REBOOT" if ganeti_up \

                         else "OP_INSTANCE_SHUTDOWN"

                backend.process_op_status(vm=vm, jobid=-0,

                    opcode=opcode, status='success',

                    logmsg='Reconciliation: simulated Ganeti event')

            print >> sys.stderr, "    ...done"