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

import datetime

import bitarray

from optparse import make_option

from synnefo.settings import PUBLIC_USE_POOL

from django.core.management.base import BaseCommand

from django.db import transaction

from synnefo.db.models import Backend, Network, BackendNetwork

from synnefo.db.pools import IPPool

from synnefo.logic import reconciliation, utils

from synnefo.logic import backend as backend_mod

fix = False

write = sys.stdout.write

class Command(BaseCommand):

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

Network reconciliation can detect and fix the following cases:

    - Missing database entries for a network in a Ganeti backend

    - Stale database networks, which do no exist in the Ganeti backend

    - Missing Ganeti networks

    - Ganeti networks that are not connected to all Ganeti nodegroups

    - Networks that have unsynced state

    - Networks that have unsynced IP pools

    - Orphan networks in the Ganeti backend

"""

    can_import_settings = True

    output_transaction = True  # The management command runs inside

                               # an SQL transaction

    option_list = BaseCommand.option_list + (

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

                    dest='fix', default=False,

                    help='Fix all issues.'),

        make_option('--conflicting-ips', action='store_true',

                    dest='conflicting_ips', default=False,

                    help='Detect conflicting ips')

        )

    def handle(self, **options):

        global fix, write

        fix = options['fix']

        write = self.stdout.write

        self.verbosity = int(options['verbosity'])

        conflicting_ips = options['conflicting_ips']

        reconcile_networks(conflicting_ips)

def reconcile_networks(conflicting_ips=False):

    # Get models from DB

    backends = Backend.objects.exclude(offline=True)

    networks = Network.objects.filter(deleted=False)

    # Get info from all ganeti backends

    ganeti_networks = {}

    ganeti_hanging_networks = {}

    for b in backends:

        g_nets = reconciliation.get_networks_from_ganeti(b)

        ganeti_networks[b] = g_nets

        g_hanging_nets = reconciliation.hanging_networks(b, g_nets)

        ganeti_hanging_networks[b] = g_hanging_nets

    # Perform reconciliation for each network

    for network in networks:

        ip_available_maps = []

        ip_reserved_maps = []

        uses_pool = not network.public or PUBLIC_USE_POOL

        for bend in backends:

            bnet = get_backend_network(network, bend)

            if not bnet:

                # CASE-1: Paritioned network

                if not network.public:

                    bnet = reconcile_parted_network(network, bend)

                    if not fix:

                        continue

                else:

                    continue

            try:

                gnet = ganeti_networks[b][network.id]

            except KeyError:

                # Network does not exist in backend. If the network action is

                # DESTROY, then we must destroy the network in the backend.

                # Else we have to create it!

                if network.action == "DESTROY" and bnet.operstate != "DELETED":

                    # CASE-2: Stale DB network

                    reconcile_stale_network(bnet)

                    # Skip rest reconciliation as the backend is just being

                    # deleted

                    continue

                else:

                    # CASE-3: Missing Ganeti network

                    reconcile_missing_network(network, bend)

                    # Skip rest reconciliation as the network is just

                    # being created

                    continue

            try:

                hanging_groups = ganeti_hanging_networks[bend][network.id]

            except KeyError:

                # Network is connected to all nodegroups

                hanging_groups = []

            if hanging_groups:

                # CASE-3: Ganeti networks not connected to all nodegroups

                reconcile_hanging_groups(network, bend, hanging_groups)

                continue

            if bnet.operstate != 'ACTIVE':

                # CASE-4: Unsynced network state. At this point the network

                # exists and is connected to all nodes so is must be active!

                reconcile_unsynced_network(network, bend, bnet)

            if uses_pool:

                # Get ganeti IP Pools

                available_map, reserved_map = get_network_pool(gnet)

                ip_available_maps.append(available_map)

                ip_reserved_maps.append(reserved_map)

        if uses_pool and (ip_available_maps or ip_reserved_maps):

            # CASE-5: Unsynced IP Pools

            reconcile_ip_pools(network, ip_available_maps, ip_reserved_maps)

        if conflicting_ips:

            detect_conflicting_ips()

    # CASE-6: Orphan networks

    reconcile_orphan_networks(networks, ganeti_networks)

def get_backend_network(network, backend):

    try:

        return BackendNetwork.objects.get(network=network, backend=backend)

    except BackendNetwork.DoesNotExist:

        return None

def reconcile_parted_network(network, backend):

    write("D: Missing DB entry for network %s in backend %s\n" %

          (network, backend))

    if fix:

        network.create_backend_network(backend)

        write("F: Created DB entry\n")

        bnet = get_backend_network(network, backend)

        return bnet

def reconcile_stale_network(backend_network):

    write("D: Stale DB entry for network %s in backend %s\n" %

          (backend_network.network, backend_network.backend))

    if fix:

        etime = datetime.datetime.now()

        backend_mod.process_network_status(backend_network, etime, 0,

                                          "OP_NETWORK_REMOVE",

                                          "success",

                                          "Reconciliation simulated event")

        write("F: Reconciled event: OP_NETWORK_REMOVE\n")

def reconcile_missing_network(network, backend):

    write("D: Missing Ganeti network %s in backend %s\n" %

          (network, backend))

    if fix:

        backend_mod.create_network(network, [backend])

        write("F: Issued OP_NETWORK_CONNECT\n")

def reconcile_hanging_groups(network, backend, hanging_groups):

    write('D: Network %s in backend %s is not connected to '

          'the following groups:\n' % (network, backend))

    write('-  ' + '\n-  '.join(hanging_groups) + '\n')

    if fix:

        for group in hanging_groups:

            write('F: Connecting network %s to nodegroup %s\n'

                  % (network, group))

            backend_mod.connect_network(network, backend, group=group)

def reconcile_unsynced_network(network, backend, backend_network):

    write("D: Unsynced network %s in backend %s\n" % (network, backend))

    if fix:

        write("F: Issuing OP_NETWORK_CONNECT\n")

        etime = datetime.datetime.now()

        backend_mod.process_network_status(backend_network, etime, 0,

                                          "OP_NETWORK_CONNECT",

                                          "success",

                                          "Reconciliation simulated eventd")

def reconcile_ip_pools(network, available_maps, reserved_maps):

    available_map = reduce(lambda x, y: x & y, available_maps)

    reserved_map = reduce(lambda x, y: x & y, reserved_maps)

    pool = network.get_pool()

    if pool.available != available_map:

        write("D: Unsynced available map of network %s:\n"

              "\tDB: %r\n\tGB: %r\n" %

              (network, pool.available.to01(), available_map.to01()))

        if fix:

            pool.available = available_map

    if pool.reserved != reserved_map:

        write("D: Unsynced reserved map of network %s:\n"

              "\tDB: %r\n\tGB: %r\n" %

              (network, pool.reserved.to01(), reserved_map.to01()))

        if fix:

            pool.reserved = reserved_map

    pool.save()

def detect_conflicting_ips(network):

    """Detect NIC's that have the same IP in the same network."""

    machine_ips = network.nics.all().values_list('ipv4', 'machine')

    ips = map(lambda x: x[0], machine_ips)

    distinct_ips = set(ips)

    if len(distinct_ips) < len(ips):

        for i in distinct_ips:

            ips.remove(i)

        for i in ips:

            machines = [utils.id_to_instance_name(x[1]) \

                        for x in machine_ips if x[0] == i]

            write('D: Conflicting IP:%s Machines: %s\n' %

                  (i, ', '.join(machines)))

def reconcile_orphan_networks(db_networks, ganeti_networks):

    # Detect Orphan Networks in Ganeti

    db_network_ids = set([net.id for net in db_networks])

    for back_end, ganeti_networks in ganeti_networks.items():

        ganeti_network_ids = set(ganeti_networks.keys())

        orphans = ganeti_network_ids - db_network_ids

        if len(orphans) > 0:

            write('D: Orphan Networks in backend %s:\n' % back_end.clustername)

            write('-  ' + '\n-  '.join([str(o) for o in orphans]) + '\n')

            if fix:

                for net_id in orphans:

                    write('Disconnecting and deleting network %d\n' % net_id)

                    network = Network.objects.get(id=net_id)

                    backend_mod.delete_network(network, backends=[back_end])

def get_network_pool(gnet):

    """Return available and reserved IP maps.

    Extract the available and reserved IP map from the info return from Ganeti

    for a network.

    """

    converter = IPPool(Foo(gnet['network']))

    a_map = bitarray_from_map(gnet['map'])

    a_map.invert()

    reserved = gnet['external_reservations']

    r_map = a_map.copy()

    r_map.setall(True)

    for address in reserved.split(','):

        index = converter.value_to_index(address)

        a_map[index] = True

        r_map[index] = False

    return a_map, r_map

def bitarray_from_map(bitmap):

    return bitarray.bitarray(bitmap.replace("X", "1").replace(".", "0"))

class Foo():

    def __init__(self, subnet):

        self.available_map = ''

        self.reserved_map = ''

        self.size = 0

        self.network = Foo.Foo1(subnet)

    class Foo1():

        def __init__(self, subnet):

            self.subnet = subnet

            self.gateway = None