Synnefo

# Copyright 2011 GRNET S.A. All rights reserved.

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import json

from logging import getLogger

from django.conf import settings

from django.db import transaction

from datetime import datetime

from synnefo.db.models import (Backend, VirtualMachine, Network,

                               BackendNetwork, BACKEND_STATUSES)

from synnefo.logic import utils, ippool

from synnefo.api.faults import OverLimit

from synnefo.util.rapi import GanetiRapiClient

log = getLogger('synnefo.logic')

_firewall_tags = {

    'ENABLED': settings.GANETI_FIREWALL_ENABLED_TAG,

    'DISABLED': settings.GANETI_FIREWALL_DISABLED_TAG,

    'PROTECTED': settings.GANETI_FIREWALL_PROTECTED_TAG}

_reverse_tags = dict((v.split(':')[3], k) for k, v in _firewall_tags.items())

def create_client(hostname, port=5080, username=None, password=None):

    return GanetiRapiClient(hostname, port, username, password)

@transaction.commit_on_success

def process_op_status(vm, etime, jobid, opcode, status, logmsg):

    """Process a job progress notification from the backend

    Process an incoming message from the backend (currently Ganeti).

    Job notifications with a terminating status (sucess, error, or canceled),

    also update the operating state of the VM.

    """

    # See #1492, #1031, #1111 why this line has been removed

    #if (opcode not in [x[0] for x in VirtualMachine.BACKEND_OPCODES] or

    if status not in [x[0] for x in BACKEND_STATUSES]:

        raise VirtualMachine.InvalidBackendMsgError(opcode, status)

    vm.backendjobid = jobid

    vm.backendjobstatus = status

    vm.backendopcode = opcode

    vm.backendlogmsg = logmsg

    # Notifications of success change the operating state

    state_for_success = VirtualMachine.OPER_STATE_FROM_OPCODE.get(opcode, None)

    if status == 'success' and state_for_success is not None:

        utils.update_state(vm, state_for_success)

        # Set the deleted flag explicitly, cater for admin-initiated removals

        if opcode == 'OP_INSTANCE_REMOVE':

            release_instance_nics(vm)

            vm.deleted = True

            vm.nics.all().delete()

    # Special case: if OP_INSTANCE_CREATE fails --> ERROR

    if status in ('canceled', 'error') and opcode == 'OP_INSTANCE_CREATE':

        utils.update_state(vm, 'ERROR')

    # Special case: OP_INSTANCE_REMOVE fails for machines in ERROR,

    # when no instance exists at the Ganeti backend.

    # See ticket #799 for all the details.

    #

    if (status == 'error' and opcode == 'OP_INSTANCE_REMOVE'):

        vm.deleted = True

        vm.nics.all().delete()

    vm.backendtime = etime

    # Any other notification of failure leaves the operating state unchanged

    vm.save()

@transaction.commit_on_success

def process_net_status(vm, etime, nics):

    """Process a net status notification from the backend

    Process an incoming message from the Ganeti backend,

    detailing the NIC configuration of a VM instance.

    Update the state of the VM in the DB accordingly.

    """

    # Release the ips of the old nics. Get back the networks as multiple

    # changes in the same network, must happen in the same Network object,

    # because transaction will be commited only on exit of the function.

    networks = release_instance_nics(vm)

    new_nics = enumerate(nics)

    for i, new_nic in new_nics:

        network = new_nic.get('network', '')

        n = str(network)

        pk = utils.id_from_network_name(n)

        # Get the cached Network or get it from DB

        if pk in networks:

            net = networks[pk]

        else:

            net = Network.objects.select_for_update().get(pk=pk)

        # Get the new nic info

        mac = new_nic.get('mac', '')

        ipv4 = new_nic.get('ip', '')

        ipv6 = new_nic.get('ipv6', '')

        firewall = new_nic.get('firewall', '')

        firewall_profile = _reverse_tags.get(firewall, '')

        if not firewall_profile and net.public:

            firewall_profile = settings.DEFAULT_FIREWALL_PROFILE

        if ipv4:

            net.reserve_address(ipv4)

        vm.nics.create(

            network=net,

            index=i,

            mac=mac,

            ipv4=ipv4,

            ipv6=ipv6,

            firewall_profile=firewall_profile,

            dirty=False)

    vm.backendtime = etime

    vm.save()

def release_instance_nics(vm):

    networks = {}

    for nic in vm.nics.all():

        pk = nic.network.pk

        # Get the cached Network or get it from DB

        if pk in networks:

            net = networks[pk]

        else:

            # Get the network object in exclusive mode in order

            # to guarantee consistency of the address pool

            net = Network.objects.select_for_update().get(pk=pk)

        if nic.ipv4:

            net.release_address(nic.ipv4)

        nic.delete()

    return networks

@transaction.commit_on_success

def process_network_status(back_network, etime, jobid, opcode, status, logmsg):

    if status not in [x[0] for x in BACKEND_STATUSES]:

        return

        #raise Network.InvalidBackendMsgError(opcode, status)

    back_network.backendjobid = jobid

    back_network.backendjobstatus = status

    back_network.backendopcode = opcode

    back_network.backendlogmsg = logmsg

    # Notifications of success change the operating state

    state_for_success = BackendNetwork.OPER_STATE_FROM_OPCODE.get(opcode, None)

    if status == 'success' and state_for_success is not None:

        back_network.operstate = state_for_success

        if opcode == 'OP_NETWORK_REMOVE':

            back_network.deleted = True

    if status in ('canceled', 'error') and opcode == 'OP_NETWORK_CREATE':

        utils.update_state(back_network, 'ERROR')

    if (status == 'error' and opcode == 'OP_NETWORK_REMOVE'):

        back_network.deleted = True

        back_network.operstate = 'DELETED'

    back_network.save()

@transaction.commit_on_success

def process_create_progress(vm, etime, rprogress, wprogress):

    # XXX: This only uses the read progress for now.

    #      Explore whether it would make sense to use the value of wprogress

    #      somewhere.

    percentage = int(rprogress)

    # The percentage may exceed 100%, due to the way

    # snf-progress-monitor tracks bytes read by image handling processes

    percentage = 100 if percentage > 100 else percentage

    if percentage < 0:

        raise ValueError("Percentage cannot be negative")

    # FIXME: log a warning here, see #1033

#   if last_update > percentage:

#       raise ValueError("Build percentage should increase monotonically " \

#                        "(old = %d, new = %d)" % (last_update, percentage))

    # This assumes that no message of type 'ganeti-create-progress' is going to

    # arrive once OP_INSTANCE_CREATE has succeeded for a Ganeti instance and

    # the instance is STARTED.  What if the two messages are processed by two

    # separate dispatcher threads, and the 'ganeti-op-status' message for

    # successful creation gets processed before the 'ganeti-create-progress'

    # message? [vkoukis]

    #

    #if not vm.operstate == 'BUILD':

    #    raise VirtualMachine.IllegalState("VM is not in building state")

    vm.buildpercentage = percentage

    vm.backendtime = etime

    vm.save()

def start_action(vm, action):

    """Update the state of a VM when a new action is initiated."""

    if not action in [x[0] for x in VirtualMachine.ACTIONS]:

        raise VirtualMachine.InvalidActionError(action)

    # No actions to deleted and no actions beside destroy to suspended VMs

    if vm.deleted:

        raise VirtualMachine.DeletedError

    # No actions to machines being built. They may be destroyed, however.

    if vm.operstate == 'BUILD' and action != 'DESTROY':

        raise VirtualMachine.BuildingError

    vm.action = action

    vm.backendjobid = None

    vm.backendopcode = None

    vm.backendjobstatus = None

    vm.backendlogmsg = None

    # Update the relevant flags if the VM is being suspended or destroyed.

    # Do not set the deleted flag here, see ticket #721.

    #

    # The deleted flag is set asynchronously, when an OP_INSTANCE_REMOVE

    # completes successfully. Hence, a server may be visible for some time

    # after a DELETE /servers/id returns HTTP 204.

    #

    if action == "DESTROY":

        # vm.deleted = True

        pass

    elif action == "SUSPEND":

        vm.suspended = True

    elif action == "START":

        vm.suspended = False

    vm.save()

@transaction.commit_on_success

def create_instance(vm, flavor, image, password, personality):

    """`image` is a dictionary which should contain the keys:

            'backend_id', 'format' and 'metadata'

        metadata value should be a dictionary.

    """

    if settings.PUBLIC_ROUTED_USE_POOL:

        # Get the Network object in exclusive mode in order to

        # safely (isolated) reserve an IP address

        try:

            network = Network.objects.select_for_update().get(public=True)

        except Network.DoesNotExist:

            raise Exception('No public network available')

        pool = ippool.IPPool(network)

        try:

            address = pool.get_free_address()

        except ippool.IPPool.IPPoolExhausted:

            raise OverLimit("Can not allocate IP for new machine."

                            " Public network is full.")

        pool.save()

        nic = {'ip': address, 'network': settings.GANETI_PUBLIC_NETWORK}

    else:

        nic = {'ip': 'pool', 'network': settings.GANETI_PUBLIC_NETWORK}

    if settings.IGNORE_FLAVOR_DISK_SIZES:

        if image['backend_id'].find("windows") >= 0:

            sz = 14000

        else:

            sz = 4000

    else:

        sz = flavor.disk * 1024

    # Handle arguments to CreateInstance() as a dictionary,

    # initialize it based on a deployment-specific value.

    # This enables the administrator to override deployment-specific

    # arguments, such as the disk template to use, name of os provider

    # and hypervisor-specific parameters at will (see Synnefo #785, #835).

    #

    kw = settings.GANETI_CREATEINSTANCE_KWARGS

    kw['mode'] = 'create'

    kw['name'] = vm.backend_vm_id

    # Defined in settings.GANETI_CREATEINSTANCE_KWARGS

    kw['disk_template'] = flavor.disk_template

    kw['disks'] = [{"size": sz}]

    kw['nics'] = [nic]

    # Defined in settings.GANETI_CREATEINSTANCE_KWARGS

    # kw['os'] = settings.GANETI_OS_PROVIDER

    kw['ip_check'] = False

    kw['name_check'] = False

    # Do not specific a node explicitly, have

    # Ganeti use an iallocator instead

    #

    # kw['pnode']=rapi.GetNodes()[0]

    kw['dry_run'] = settings.TEST

    kw['beparams'] = {

        'auto_balance': True,

        'vcpus': flavor.cpu,

        'memory': flavor.ram}

    kw['osparams'] = {

        'img_id': image['backend_id'],

        'img_passwd': password,

        'img_format': image['format']}

    if personality:

        kw['osparams']['img_personality'] = json.dumps(personality)

    kw['osparams']['img_properties'] = json.dumps(image['metadata'])

    # Defined in settings.GANETI_CREATEINSTANCE_KWARGS

    # kw['hvparams'] = dict(serial_console=False)

    return vm.client.CreateInstance(**kw)

def delete_instance(vm):

    start_action(vm, 'DESTROY')

    vm.client.DeleteInstance(vm.backend_vm_id, dry_run=settings.TEST)

def reboot_instance(vm, reboot_type):

    assert reboot_type in ('soft', 'hard')

    vm.client.RebootInstance(vm.backend_vm_id, reboot_type, dry_run=settings.TEST)

    log.info('Rebooting instance %s', vm.backend_vm_id)

def startup_instance(vm):

    start_action(vm, 'START')

    vm.client.StartupInstance(vm.backend_vm_id, dry_run=settings.TEST)

def shutdown_instance(vm):

    start_action(vm, 'STOP')

    vm.client.ShutdownInstance(vm.backend_vm_id, dry_run=settings.TEST)

def get_instance_console(vm):

    # RAPI GetInstanceConsole() returns endpoints to the vnc_bind_address,

    # which is a cluster-wide setting, either 0.0.0.0 or 127.0.0.1, and pretty

    # useless (see #783).

    #

    # Until this is fixed on the Ganeti side, construct a console info reply

    # directly.

    #

    # WARNING: This assumes that VNC runs on port network_port on

    #          the instance's primary node, and is probably

    #          hypervisor-specific.

    #

    console = {}

    console['kind'] = 'vnc'

    i = vm.client.GetInstance(vm.backend_vm_id)

    if i['hvparams']['serial_console']:

        raise Exception("hv parameter serial_console cannot be true")

    console['host'] = i['pnode']

    console['port'] = i['network_port']

    return console

    # return rapi.GetInstanceConsole(vm.backend_vm_id)

def request_status_update(vm):

    return vm.client.GetInstanceInfo(vm.backend_vm_id)

def update_status(vm, status):

    utils.update_state(vm, status)

def create_network(network, backends=None):

    """ Add and connect a network to backends.

    @param network: Network object

    @param backends: List of Backend objects. None defaults to all.

    """

    backend_jobs = _create_network(network, backends)

    connect_network(network, backend_jobs)

    return network

def _create_network(network, backends=None):

    """Add a network to backends.

    @param network: Network object

    @param backends: List of Backend objects. None defaults to all.

    """

    network_type = network.public and 'public' or 'private'

    if not backends:

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

    tags = network.backend_tag

    if network.dhcp:

        tags.append('nfdhcpd')

    tags = ','.join(tags)

    backend_jobs = []

    for backend in backends:

        try:

            backend_network = BackendNetwork.objects.get(network=network,

                                                         backend=backend)

        except BackendNetwork.DoesNotExist:

            raise Exception("BackendNetwork for network '%s' in backend '%s'"\

                            " does not exist" % (network.id, backend.id))

        job = backend.client.CreateNetwork(

                network_name=network.backend_id,

                network=network.subnet,

                gateway=network.gateway,

                network_type=network_type,

                mac_prefix=backend_network.mac_prefix,

                tags=tags)

        backend_jobs.append((backend, job))

    return backend_jobs

def connect_network(network, backend_jobs=None):

    """Connect a network to all nodegroups.

    @param network: Network object

    @param backend_jobs: List of tuples of the form (Backend, jobs) which are

                         the backends to connect the network and the jobs on

                         which the connect job depends.

    """

    if network.type in ('PUBLIC_ROUTED', 'CUSTOM_ROUTED'):

        mode = 'routed'

    else:

        mode = 'bridged'

    if not backend_jobs:

        backend_jobs = [(backend, []) for backend in

                        Backend.objects.exclude(offline=True)]

    for backend, job in backend_jobs:

        client = backend.client

        for group in client.GetGroups():

            client.ConnectNetwork(network.backend_id, group, mode,

                                  network.link, [job])

def connect_network_group(backend, network, group):

    """Connect a network to a specific nodegroup of a backend.

    """

    if network.type in ('PUBLIC_ROUTED', 'CUSTOM_ROUTED'):

        mode = 'routed'

    else:

        mode = 'bridged'

    return backend.client.ConnectNetwork(network.backend_id, group, mode,

                                         network.link)

def delete_network(network, backends=None):

    """ Disconnect and a remove a network from backends.

    @param network: Network object

    @param backends: List of Backend objects. None defaults to all.

    """

    backend_jobs = disconnect_network(network, backends)

    _delete_network(network, backend_jobs)

def disconnect_network(network, backends=None):

    """Disconnect a network from all nodegroups.

    @param network: Network object

    @param backends: List of Backend objects. None defaults to all.

    """

    if not backends:

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

    backend_jobs = []

    for backend in backends:

        client = backend.client

        jobs = []

        for group in client.GetGroups():

            job = client.DisconnectNetwork(network.backend_id, group)

            jobs.append(job)

        backend_jobs.append((backend, jobs))

    return backend_jobs

def disconnect_from_network(vm, nic):

    """Disconnect a virtual machine from a network by removing it's nic.

    @param vm: VirtualMachine object

    @param network: Network object

    """

    op = [('remove', nic.index, {})]

    return vm.client.ModifyInstance(vm.backend_vm_id, nics=op,

                                   hotplug=True, dry_run=settings.TEST)

def _delete_network(network, backend_jobs=None):

    if not backend_jobs:

        backend_jobs = [(backend, []) for backend in

                Backend.objects.exclude(offline=True)]

    for backend, jobs in backend_jobs:

        backend.client.DeleteNetwork(network.backend_id, jobs)

def connect_to_network(vm, network, address):

    """Connect a virtual machine to a network.

    @param vm: VirtualMachine object

    @param network: Network object

    """

    # ip = network.dhcp and 'pool' or None

    nic = {'ip': address, 'network': network.backend_id}

    vm.client.ModifyInstance(vm.backend_vm_id, nics=[('add',  nic)],

                             hotplug=True, dry_run=settings.TEST)

def set_firewall_profile(vm, profile):

    try:

        tag = _firewall_tags[profile]

    except KeyError:

        raise ValueError("Unsopported Firewall Profile: %s" % profile)

    client = vm.client

    # Delete all firewall tags

    for t in _firewall_tags.values():

        client.DeleteInstanceTags(vm.backend_vm_id, [t], dry_run=settings.TEST)

    client.AddInstanceTags(vm.backend_vm_id, [tag], dry_run=settings.TEST)

    # XXX NOP ModifyInstance call to force process_net_status to run

    # on the dispatcher

    vm.client.ModifyInstance(vm.backend_vm_id,

                        os_name=settings.GANETI_CREATEINSTANCE_KWARGS['os'])

def get_ganeti_instances(backend=None, bulk=False):

    Instances = [c.client.GetInstances(bulk=bulk)\

                 for c in get_backends(backend)]

    return reduce(list.__add__, Instances, [])

def get_ganeti_nodes(backend=None, bulk=False):

    Nodes = [c.client.GetNodes(bulk=bulk) for c in get_backends(backend)]

    return reduce(list.__add__, Nodes, [])

def get_ganeti_jobs(backend=None, bulk=False):

    Jobs = [c.client.GetJobs(bulk=bulk) for c in get_backends(backend)]

    return reduce(list.__add__, Jobs, [])

##

##

##

def get_backends(backend=None):

    if backend:

        return [backend]

    return Backend.objects.filter(offline=False)

def get_physical_resources(backend):

    """ Get the physical resources of a backend.

    Get the resources of a backend as reported by the backend (not the db).

    """

    nodes = get_ganeti_nodes(backend, bulk=True)

    attr = ['mfree', 'mtotal', 'dfree', 'dtotal', 'pinst_cnt', 'ctotal']

    res = {}

    for a in attr:

        res[a] = 0

    for n in nodes:

        # Filter out drained, offline and not vm_capable nodes since they will

        # not take part in the vm allocation process

        if n['vm_capable'] and not n['drained'] and not n['offline']\

           and n['cnodes']:

            for a in attr:

                res[a] += int(n[a])

    return res

def update_resources(backend, resources=None):

    """ Update the state of the backend resources in db.

    """

    if not resources:

        resources = get_physical_resources(backend)

    backend.mfree = resources['mfree']

    backend.mtotal = resources['mtotal']

    backend.dfree = resources['dfree']

    backend.dtotal = resources['dtotal']

    backend.pinst_cnt = resources['pinst_cnt']

    backend.ctotal = resources['ctotal']

    backend.updated = datetime.now()

    backend.save()

def get_memory_from_instances(backend):

    """ Get the memory that is used from instances.

    Get the used memory of a backend. Note: This is different for

    the real memory used, due to kvm's memory de-duplication.

    """

    instances = backend.client.GetInstances(bulk=True)

    mem = 0

    for i in instances:

        mem += i['oper_ram']

    return mem

##

## Synchronized operations for reconciliation

##

def create_network_synced(network, backend):

    result = _create_network_synced(network, backend)

    if result[0] != 'success':

        return result

    result = connect_network_synced(network, backend)

    return result

def _create_network_synced(network, backend):

    client = backend.client

    backend_jobs = _create_network(network, [backend])

    (_, job) = backend_jobs[0]

    return wait_for_job(client, job)

def connect_network_synced(network, backend):

    if network.type in ('PUBLIC_ROUTED', 'CUSTOM_ROUTED'):

        mode = 'routed'

    else:

        mode = 'bridged'

    client = backend.client

    for group in client.GetGroups():

        job = client.ConnectNetwork(network.backend_id, group, mode,

                                    network.link)

        result = wait_for_job(client, job)

        if result[0] != 'success':

            return result

    return result

def wait_for_job(client, jobid):

    result = client.WaitForJobChange(jobid, ['status', 'opresult'], None, None)

    status = result['job_info'][0]

    while status not in ['success', 'error', 'cancel']:

        result = client.WaitForJobChange(jobid, ['status', 'opresult'],

                                        [result], None)

        status = result['job_info'][0]

    if status == 'success':

        return (status, None)

    else:

        error = result['job_info'][1]

        return (status, error)