Synnefo

# Copyright 2011-2013 GRNET S.A. All rights reserved.

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import ipaddr

from functools import wraps

from django.db import transaction

from django.conf import settings

from snf_django.lib.api import faults

from synnefo.api import util

from synnefo import quotas

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

from synnefo.db.utils import validate_mac

from synnefo.db.pools import EmptyPool

from synnefo.logic import backend as backend_mod

from logging import getLogger

log = getLogger(__name__)

def validate_network_action(network, action):

    if network.deleted:

        raise faults.BadRequest("Network has been deleted.")

def network_command(action):

    def decorator(func):

        @wraps(func)

        @transaction.commit_on_success()

        def wrapper(network, *args, **kwargs):

            validate_network_action(network, action)

            return func(network, *args, **kwargs)

        return wrapper

    return decorator

@transaction.commit_on_success

def create(userid, name, flavor, subnet=None, gateway=None, subnet6=None,

           gateway6=None, public=False, dhcp=True, link=None, mac_prefix=None,

           mode=None, floating_ip_pool=False, tags=None, backends=None,

           lazy_create=True):

    if flavor is None:

        raise faults.BadRequest("Missing request parameter 'type'")

    elif flavor not in Network.FLAVORS.keys():

        raise faults.BadRequest("Invalid network type '%s'" % flavor)

    if mac_prefix is not None and flavor == "MAC_FILTERED":

        raise faults.BadRequest("Can not override MAC_FILTERED mac-prefix")

    if link is not None and flavor == "PHYSICAL_VLAN":

        raise faults.BadRequest("Can not override PHYSICAL_VLAN link")

    if subnet is None and floating_ip_pool:

        raise faults.BadRequest("IPv6 only networks can not be floating"

                                " pools.")

    # Check that network parameters are valid

    validate_network_params(subnet, gateway, subnet6, gateway6)

    try:

        fmode, flink, fmac_prefix, ftags = util.values_from_flavor(flavor)

    except EmptyPool:

        log.error("Failed to allocate resources for network of type: %s",

                  flavor)

        msg = "Failed to allocate resources for network."

        raise faults.ServiceUnavailable(msg)

    mode = mode or fmode

    link = link or flink

    mac_prefix = mac_prefix or fmac_prefix

    tags = tags or ftags

    if (flavor == "IP_LESS_ROUTED" and

       Network.objects.filter(deleted=False, mode=mode, link=link).exists()):

        msg = "Link '%s' is already used." % link

        raise faults.BadRequest(msg)

    validate_mac(mac_prefix + "0:00:00:00")

    network = Network.objects.create(

        name=name,

        userid=userid,

        flavor=flavor,

        mode=mode,

        link=link,

        mac_prefix=mac_prefix,

        tags=tags,

        public=public,

        external_router=public,

        floating_ip_pool=floating_ip_pool,

        action='CREATE',

        state='ACTIVE')

    if subnet:

        s = Subnet.objects.create(network=network,

                                  ipversion=4,

                                  cidr=subnet,

                                  gateway=gateway,

                                  dhcp=dhcp)

        s.ip_pools.create(size=0)

    if subnet6:

        Subnet.objects.create(network=network,

                              ipversion=6,

                              cidr=subnet6,

                              gateway=gateway6,

                              dhcp=dhcp)

    # Issue commission to Quotaholder and accept it since at the end of

    # this transaction the Network object will be created in the DB.

    # Note: the following call does a commit!

    if not public:

        quotas.issue_and_accept_commission(network)

    if not lazy_create:

        if floating_ip_pool:

            backends = Backend.objects.filter(offline=False)

        elif backends is None:

            backends = []

        for bend in backends:

            network.create_backend_network(bend)

            backend_mod.create_network(network=network, backend=bend,

                                       connect=True)

    return network

@network_command("RENAME")

def rename(network, name):

    network.name = name

    network.save()

    return network

@network_command("DESTROY")

def delete(network):

    if network.machines.exists():

        raise faults.Conflict("Can not delete network. Servers connected"

                              " to this network exists.")

    if network.ips.filter(deleted=False, floating_ip=True).exists():

        msg = "Can not delete netowrk. Network has allocated floating IPs."

        raise faults.Conflict(msg)

    network.action = "DESTROY"

    network.save()

    # Delete network to all backends that exists

    for bnet in network.backend_networks.exclude(operstate="DELETED"):

        backend_mod.delete_network(network, bnet.backend)

    else:

        # If network does not exist in any backend, update the network state

        backend_mod.update_network_state(network)

    return network

def validate_network_params(subnet=None, gateway=None, subnet6=None,

                            gateway6=None):

    if subnet:

        try:

            # Use strict option to not all subnets with host bits set

            network = ipaddr.IPv4Network(subnet, strict=True)

        except ValueError:

            raise faults.BadRequest("Invalid network IPv4 subnet")

        # Check that network size is allowed!

        prefixlen = network.prefixlen

        if prefixlen > 29 or prefixlen <= settings.MAX_CIDR_BLOCK:

            raise faults.OverLimit(

                message="Unsupported network size",

                details="Netmask must be in range: (%s, 29]" %

                settings.MAX_CIDR_BLOCK)

        if gateway:  # Check that gateway belongs to network

            try:

                gateway = ipaddr.IPv4Address(gateway)

            except ValueError:

                raise faults.BadRequest("Invalid network IPv4 gateway")

            if not gateway in network:

                raise faults.BadRequest("Invalid network IPv4 gateway")

    if subnet6:

        try:

            # Use strict option to not all subnets with host bits set

            network6 = ipaddr.IPv6Network(subnet6, strict=True)

        except ValueError:

            raise faults.BadRequest("Invalid network IPv6 subnet")

        # Check that network6 is an /64 subnet, because this is imposed by

        # 'mac2eui64' utiity.

        if network6.prefixlen != 64:

            msg = ("Unsupported IPv6 subnet size. Network netmask must be"

                   " /64")

            raise faults.BadRequest(msg)

        if gateway6:

            try:

                gateway6 = ipaddr.IPv6Address(gateway6)

            except ValueError:

                raise faults.BadRequest("Invalid network IPv6 gateway")

            if not gateway6 in network6:

                raise faults.BadRequest("Invalid network IPv6 gateway")