Synnefo

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

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

import json

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,

                               pooled_rapi_client, VirtualMachineDiagnostic)

from synnefo.logic import utils

from logging import getLogger

log = getLogger(__name__)

_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())

@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:

        vm.operstate = state_for_success

    # Special case: if OP_INSTANCE_CREATE fails --> ERROR

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

        vm.operstate = 'ERROR'

        vm.backendtime = etime

    if opcode == 'OP_INSTANCE_REMOVE':

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

        # 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 == 'success' or (status == 'error' and

                                   vm.operstate == 'ERROR'):

            release_instance_nics(vm)

            vm.nics.all().delete()

            vm.deleted = True

            vm.operstate = state_for_success

            vm.backendtime = etime

    # Update backendtime only for jobs that have been successfully completed,

    # since only these jobs update the state of the VM. Else a "race condition"

    # may occur when a successful job (e.g. OP_INSTANCE_REMOVE) completes

    # before an error job and messages arrive in reversed order.

    if status == 'success':

        vm.backendtime = etime

    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_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)

        net = Network.objects.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)

        # Dummy save the network, because UI uses changed-since for VMs

        # and Networks in order to show the VM NICs

        net.save()

    vm.backendtime = etime

    vm.save()

def release_instance_nics(vm):

    for nic in vm.nics.all():

        net = nic.network

        if nic.ipv4:

            net.release_address(nic.ipv4)

        nic.delete()

        net.save()

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

        utils.update_state(back_network, 'ERROR')

        back_network.backendtime = etime

    if opcode == 'OP_NETWORK_REMOVE':

        if status == 'success' or (status == 'error' and

                                   back_network.operstate == 'ERROR'):

            back_network.operstate = state_for_success

            back_network.deleted = True

            back_network.backendtime = etime

    if status == 'success':

        back_network.backendtime = etime

    back_network.save()

@transaction.commit_on_success

def process_create_progress(vm, etime, progress):

    percentage = int(progress)

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

    # snf-image:copy-progress 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."""

    log.debug("Applying action %s to VM %s", action, vm)

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

        raise VirtualMachine.InvalidActionError(action)

    # No actions to deleted 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

    vm.save()

def create_instance_diagnostic(vm, message, source, level="DEBUG", etime=None,

    details=None):

    """

    Create virtual machine instance diagnostic entry.

    :param vm: VirtualMachine instance to create diagnostic for.

    :param message: Diagnostic message.

    :param source: Diagnostic source identifier (e.g. image-helper).

    :param level: Diagnostic level (`DEBUG`, `INFO`, `WARNING`, `ERROR`).

    :param etime: The time the message occured (if available).

    :param details: Additional details or debug information.

    """

    VirtualMachineDiagnostic.objects.create_for_vm(vm, level, source=source,

            source_date=etime, message=message, details=details)

def create_instance(vm, public_nic, 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.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

    # Identify if provider parameter should be set in disk options.

    # Current implementation support providers only fo ext template.

    # To select specific provider for an ext template, template name

    # should be formated as `ext_<provider_name>`.

    provider = None

    disk_template = flavor.disk_template

    if flavor.disk_template.startswith("ext"):

        disk_template, provider = flavor.disk_template.split("_", 1)

    kw['disk_template'] = disk_template

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

    if provider:

        kw['disks'][0]['provider'] = provider

        if provider == 'vlmc':

            kw['disks'][0]['origin'] = image['backend_id']

    kw['nics'] = [public_nic]

    if settings.GANETI_USE_HOTPLUG:

        kw['hotplug'] = True

    # 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)

    if provider != None and provider == 'vlmc':

        kw['osparams']['img_id'] = 'null'

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

    # Defined in settings.GANETI_CREATEINSTANCE_KWARGS

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

    log.debug("Creating instance %s", utils.hide_pass(kw))

    with pooled_rapi_client(vm) as client:

        return client.CreateInstance(**kw)

def delete_instance(vm):

    start_action(vm, 'DESTROY')

    with pooled_rapi_client(vm) as client:

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

def reboot_instance(vm, reboot_type):

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

    with pooled_rapi_client(vm) as client:

        return client.RebootInstance(vm.backend_vm_id, reboot_type,

                                     dry_run=settings.TEST)

def startup_instance(vm):

    start_action(vm, 'START')

    with pooled_rapi_client(vm) as client:

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

def shutdown_instance(vm):

    start_action(vm, 'STOP')

    with pooled_rapi_client(vm) as client:

        return 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.

    #

    log.debug("Getting console for vm %s", vm)

    console = {}

    console['kind'] = 'vnc'

    with pooled_rapi_client(vm) as client:

        i = 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

def get_instance_info(vm):

    with pooled_rapi_client(vm) as client:

        return client.GetInstanceInfo(vm.backend_vm_id)

def create_network(network, backends=None, connect=True):

    """Create and connect a network."""

    if not backends:

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

    log.debug("Creating network %s in backends %s", network, backends)

    for backend in backends:

        create_jobID = _create_network(network, backend)

        if connect:

            connect_network(network, backend, create_jobID)

def _create_network(network, backend):

    """Create a network."""

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

    tags = network.backend_tag

    if network.dhcp:

        tags.append('nfdhcpd')

    tags = ','.join(tags)

    try:

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

        mac_prefix = bn.mac_prefix

    except BackendNetwork.DoesNotExist:

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

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

    with pooled_rapi_client(backend) as client:

        return client.CreateNetwork(network_name=network.backend_id,

                                    network=network.subnet,

                                    network6=network.subnet6,

                                    gateway=network.gateway,

                                    gateway6=network.gateway6,

                                    network_type=network_type,

                                    mac_prefix=mac_prefix,

                                    tags=tags)

def connect_network(network, backend, depend_job=None, group=None):

    """Connect a network to nodegroups."""

    log.debug("Connecting network %s to backend %s", network, backend)

    mode = "routed" if "ROUTED" in network.type else "bridged"

    depend_jobs = [depend_job] if depend_job else []

    with pooled_rapi_client(backend) as client:

        if group:

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

                                  network.link, depend_jobs)

        else:

            for group in client.GetGroups():

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

                                      network.link, depend_jobs)

def delete_network(network, backends=None, disconnect=True):

    if not backends:

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

    log.debug("Deleting network %s from backends %s", network, backends)

    for backend in backends:

        disconnect_jobIDs = []

        if disconnect:

            disconnect_jobIDs = disconnect_network(network, backend)

        _delete_network(network, backend, disconnect_jobIDs)

def _delete_network(network, backend, depend_jobs=[]):

    with pooled_rapi_client(backend) as client:

        return client.DeleteNetwork(network.backend_id, depend_jobs)

def disconnect_network(network, backend, group=None):

    log.debug("Disconnecting network %s to backend %s", network, backend)

    with pooled_rapi_client(backend) as client:

        if group:

            return [client.DisconnectNetwork(network.backend_id, group)]

        else:

            jobs = []

            for group in client.GetGroups():

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

                jobs.append(job)

            return jobs

def connect_to_network(vm, network, address=None):

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

    log.debug("Connecting vm %s to network %s(%s)", vm, network, address)

    with pooled_rapi_client(vm) as client:

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

                                     hotplug=settings.GANETI_USE_HOTPLUG,

                                     dry_run=settings.TEST)

def disconnect_from_network(vm, nic):

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

    log.debug("Removing nic of VM %s, with index %s", vm, str(nic.index))

    with pooled_rapi_client(vm) as client:

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

                                     hotplug=settings.GANETI_USE_HOTPLUG,

                                     dry_run=settings.TEST)

def set_firewall_profile(vm, profile):

    try:

        tag = _firewall_tags[profile]

    except KeyError:

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

    log.debug("Setting tag of VM %s to %s", vm, profile)

    with pooled_rapi_client(vm) as 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

        client.ModifyInstance(vm.backend_vm_id,

                         os_name=settings.GANETI_CREATEINSTANCE_KWARGS['os'])

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

    instances = []

    for backend in get_backends(backend):

        with pooled_rapi_client(backend) as client:

            instances.append(client.GetInstances(bulk=bulk))

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

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

    nodes = []

    for backend in get_backends(backend):

        with pooled_rapi_client(backend) as client:

            nodes.append(client.GetNodes(bulk=bulk))

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

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

    jobs = []

    for backend in get_backends(backend):

        with pooled_rapi_client(backend) as client:

            jobs.append(client.GetJobs(bulk=bulk))

    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.

    """

    with pooled_rapi_client(backend) as client:

        instances = 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):

    with pooled_rapi_client(backend) as client:

        job = _create_network(network, backend)

        result = wait_for_job(client, job)

    return result

def connect_network_synced(network, backend):

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

        mode = 'routed'

    else:

        mode = 'bridged'

    with pooled_rapi_client(backend) as 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)