Synnefo

#!/usr/bin/env python

# -*- coding: utf-8 -*-

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"""Business logic for reconciliation

Reconcile the contents of the DB with the actual state of the

Ganeti backend.

Let D be the set of VMs in the DB, G the set of VMs in Ganeti.

RULES:

    R1. Stale servers in DB:

            For any v in D but not in G:

            Set deleted=True.

    R2. Orphan instances in Ganet:

            For any v in G with deleted=True in D:

            Issue OP_INSTANCE_DESTROY.

    R3. Unsynced operstate:

            For any v whose operating state differs between G and V:

            Set the operating state in D based on the state in G.

In the code, D, G are Python dicts mapping instance ids to operating state.

For D, the operating state is chosen from VirtualMachine.OPER_STATES.

For G, the operating state is True if the machine is up, False otherwise.

"""

import logging

import sys

import itertools

from django.core.management import setup_environ

try:

    from synnefo import settings

except ImportError:

    raise Exception("Cannot import settings, make sure PYTHONPATH contains "

                    "the parent directory of the Synnefo Django project.")

setup_environ(settings)

from datetime import datetime, timedelta

from collections import namedtuple

from synnefo.db.models import (VirtualMachine, NetworkInterface,

                               pooled_rapi_client)

from synnefo.logic.rapi import GanetiApiError

from synnefo.logic.backend import get_instances

from synnefo.logic import utils

log = logging.getLogger()

try:

    CHECK_INTERVAL = settings.RECONCILIATION_CHECK_INTERVAL

except AttributeError:

    CHECK_INTERVAL = 60

def needs_reconciliation(vm):

    now = datetime.now()

    return (now > vm.updated + timedelta(seconds=CHECK_INTERVAL)) or\

           (now > vm.backendtime + timedelta(seconds=2*CHECK_INTERVAL))

VMState = namedtuple("VMState", ["state", "nics"])

def stale_servers_in_db(D, G):

    idD = set(D.keys())

    idG = set(G.keys())

    stale = set()

    for i in idD - idG:

        if D[i] == 'BUILD':

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

            if needs_reconciliation(vm):

                with pooled_rapi_client(vm) as c:

                    try:

                        job_status = c.GetJobStatus(vm.backendjobid)['status']

                        if job_status in ('queued', 'waiting', 'running'):

                            # Server is still building in Ganeti

                            continue

                        else:

                            c.GetInstance(utils.id_to_instance_name(i))

                            # Server has just been created in Ganeti

                            continue

                    except GanetiApiError:

                        stale.add(i)

        else:

            stale.add(i)

    return stale

def orphan_instances_in_ganeti(D, G):

    idD = set(D.keys())

    idG = set(G.keys())

    return idG - idD

def unsynced_operstate(D, G):

    unsynced = set()

    idD = set(D.keys())

    idG = set(G.keys())

    for i in idD & idG:

        dbstate = D[i].state

        gntstate = G[i].state

        vm_unsynced = (gntstate and dbstate != "STARTED") or\

            (not gntstate and dbstate not in ('BUILD', 'ERROR', 'STOPPED'))

        if vm_unsynced:

            unsynced.add((i, dbstate, gntstate))

        if not gntstate and dbstate == 'BUILD':

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

            if needs_reconciliation(vm):

                with pooled_rapi_client(vm) as c:

                    try:

                        job_info = c.GetJobStatus(job_id=vm.backendjobid)

                        if job_info['status'] == 'success':

                            unsynced.add((i, dbstate, gntstate))

                    except GanetiApiError:

                        pass

    return unsynced

def instances_with_build_errors(D, G):

    failed = set()

    idD = set(D.keys())

    idG = set(G.keys())

    for i in idD & idG:

        if not G[i] and D[i] == 'BUILD':

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

            if not vm.backendjobid:  # VM has not been enqueued in the backend

                if datetime.now() > vm.created + timedelta(seconds=120):

                    # If a job has not been enqueued after 2 minutues, then

                    # it must be a stale entry..

                    failed.add(i)

            elif needs_reconciliation(vm):

                # Check time to avoid many rapi calls

                with pooled_rapi_client(vm) as c:

                    try:

                        job_info = c.GetJobStatus(job_id=vm.backendjobid)

                        if job_info['status'] == 'error':

                            failed.add(i)

                    except GanetiApiError:

                        failed.add(i)

    return failed

def get_servers_from_db(backends, with_nics=True):

    vms = VirtualMachine.objects.filter(deleted=False, backend__in=backends)

    vm_info = vms.values_list("id", "operstate")

    if with_nics:

        nics = NetworkInterface.objects.filter(machine__in=vms)\

                               .order_by("machine")\

                               .values_list("machine", "index", "mac", "ipv4",

                                            "network")

        vm_nics = {}

        for machine, machine_nics in itertools.groupby(nics,

                                                       lambda nic: nic[0]):

            vm_nics[machine] = {}

            for machine, index, mac, ipv4, network in machine_nics:

                nic = {'mac':      mac,

                       'network':  utils.id_to_network_name(network),

                       'ipv4':     ipv4 if ipv4 != '' else None

                       }

                vm_nics[machine][index] = nic

    servers = dict([(vm_id, VMState(state=state, nics=vm_nics.get(vm_id, [])))

                    for vm_id, state in vm_info])

    return servers

def get_instances_from_ganeti(backends):

    instances = []

    for backend in backends:

        instances.append(get_instances(backend))

    ganeti_instances = reduce(list.__add__, instances, [])

    snf_instances = {}

    prefix = settings.BACKEND_PREFIX_ID

    for i in ganeti_instances:

        if i['name'].startswith(prefix):

            try:

                id = utils.id_from_instance_name(i['name'])

            except Exception:

                log.error("Ignoring instance with malformed name %s",

                          i['name'])

                continue

            if id in snf_instances:

                log.error("Ignoring instance with duplicate Synnefo id %s",

                          i['name'])

                continue

            nics = get_nics_from_instance(i)

            snf_instances[id] = VMState(state=i["oper_state"],

                                        nics=nics)

    return snf_instances

#

# Nics

#

def get_nics_from_ganeti(backends):

    """Get network interfaces for each ganeti instance.

    """

    instances = []

    for backend in backends:

        instances.append(get_instances(backend))

    instances = reduce(list.__add__, instances, [])

    prefix = settings.BACKEND_PREFIX_ID

    snf_instances_nics = {}

    for i in instances:

        if i['name'].startswith(prefix):

            try:

                id = utils.id_from_instance_name(i['name'])

            except Exception:

                log.error("Ignoring instance with malformed name %s",

                          i['name'])

                continue

            if id in snf_instances_nics:

                log.error("Ignoring instance with duplicate Synnefo id %s",

                          i['name'])

                continue

            snf_instances_nics[id] = get_nics_from_instance(i)

    return snf_instances_nics

def get_nics_from_instance(i):

    ips = zip(itertools.repeat('ipv4'), i['nic.ips'])

    macs = zip(itertools.repeat('mac'), i['nic.macs'])

    networks = zip(itertools.repeat('network'), i['nic.networks'])

    # modes = zip(itertools.repeat('mode'), i['nic.modes'])

    # links = zip(itertools.repeat('link'), i['nic.links'])

    # nics = zip(ips,macs,modes,networks,links)

    nics = zip(ips, macs, networks)

    nics = map(lambda x: dict(x), nics)

    nics = dict(enumerate(nics))

    return nics

def unsynced_nics(DBVMs, GanetiVMs):

    """Find unsynced network interfaces between DB and Ganeti.

    @ rtype: dict; {instance_id: ganeti_nics}

    @ return Dictionary containing the instances ids that have unsynced network

    interfaces between DB and Ganeti and the network interfaces in Ganeti.

    """

    idD = set(DBVMs.keys())

    idG = set(GanetiVMs.keys())

    unsynced = {}

    for i in idD & idG:

        nicsD = DBVMs[i].nics

        nicsG = GanetiVMs[i].nics

        if len(nicsD) != len(nicsG):

            unsynced[i] = (nicsD, nicsG)

            continue

        for index in nicsG.keys():

            nicD = nicsD[index]

            nicG = nicsG[index]

            diff = (nicD['ipv4'] != nicG['ipv4'] or

                    nicD['mac'] != nicG['mac'] or

                    nicD['network'] != nicG['network'])

            if diff:

                    unsynced[i] = (nicsD, nicsG)

                    break

    return unsynced

#

# Networks

#

def get_networks_from_ganeti(backend):

    prefix = settings.BACKEND_PREFIX_ID + 'net-'

    networks = {}

    with pooled_rapi_client(backend) as c:

        for net in c.GetNetworks(bulk=True):

            if net['name'].startswith(prefix):

                id = utils.id_from_network_name(net['name'])

                networks[id] = net

    return networks

def hanging_networks(backend, GNets):

    """Get networks that are not connected to all Nodegroups.

    """

    def get_network_groups(group_list):

        groups = set()

        for g in group_list:

            g_name = g.split('(')[0]

            groups.add(g_name)

        return groups

    with pooled_rapi_client(backend) as c:

        groups = set(c.GetGroups())

    hanging = {}

    for id, info in GNets.items():

        group_list = get_network_groups(info['group_list'])

        if group_list != groups:

            hanging[id] = groups - group_list

    return hanging

# Only for testing this module individually

def main():

    print get_instances_from_ganeti()

if __name__ == "__main__":

    sys.exit(main())