Synnefo

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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

from synnefo.db.utils import validate_mac

from synnefo.db.pools import EmptyPool

from synnefo.logic import backend as backend_mod

from synnefo.logic import utils

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, link=None, mac_prefix=None, mode=None,

           floating_ip_pool=False, tags=None, public=False, drained=False,

           project=None):

    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("Cannot override MAC_FILTERED mac-prefix")

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

        raise faults.BadRequest("Cannot override PHYSICAL_VLAN link")

    utils.check_name_length(name, Network.NETWORK_NAME_LENGTH, "Network name "

                            "is too long")

    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

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

    # Check that given link is unique!

    if (link is not None and 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)

    if project is None:

        project = userid

    network = Network.objects.create(

        name=name,

        userid=userid,

        project=project,

        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',

        drained=drained)

    if link is None:

        network.link = "%slink-%d" % (settings.BACKEND_PREFIX_ID, network.id)

        network.save()

    # 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)

    return network

def create_network_in_backends(network):

    job_ids = []

    for bend in Backend.objects.filter(offline=False):

        network.create_backend_network(bend)

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

                                          connect=True)

        job_ids.extend(jobs)

    return job_ids

@network_command("RENAME")

def rename(network, name):

    network.name = name

    network.save()

    return network

@network_command("DESTROY")

def delete(network):

    if network.nics.exists():

        raise faults.Conflict("Cannot delete network. There are ports still"

                              " configured on network network %s" % network.id)

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

        msg = "Cannot delete netowrk. Network has allocated floating IPs."

        raise faults.Conflict(msg)

    network.action = "DESTROY"

    # Mark network as drained to prevent automatic allocation of

    # public/floating IPs while the network is being deleted

    if network.public:

        network.drained = True

    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

@network_command("REASSIGN")

def reassign(network, project):

    action_fields = {"to_project": project, "from_project": network.project}

    network.project = project

    network.save()

    quotas.issue_and_accept_commission(network, action="REASSIGN",

                                       action_fields=action_fields)

    return network