Synnefo

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

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from django.conf import settings

from django.conf.urls import patterns

from django.http import HttpResponse

from django.utils import simplejson as json

from django.db import transaction

from django.db.models import Q

from django.template.loader import render_to_string

from snf_django.lib import api

from synnefo.api import util

from synnefo.db.models import Network

from synnefo.logic import networks

from logging import getLogger

log = getLogger(__name__)

urlpatterns = patterns(

    'synnefo.api.networks',

    (r'^(?:/|.json|.xml)?$', 'demux'),

    (r'^/detail(?:.json|.xml)?$', 'list_networks', {'detail': True}),

    (r'^/(\w+)(?:/|.json|.xml)?$', 'network_demux'))

def demux(request):

    if request.method == 'GET':

        return list_networks(request)

    elif request.method == 'POST':

        return create_network(request)

    else:

        return api.api_method_not_allowed(request,

                                          allowed_methods=['GET', 'POST'])

def network_demux(request, network_id):

    if request.method == 'GET':

        return get_network_details(request, network_id)

    elif request.method == 'DELETE':

        return delete_network(request, network_id)

    elif request.method == 'PUT':

        return update_network(request, network_id)

    else:

        return api.api_method_not_allowed(request,

                                          allowed_methods=['GET',

                                                           'PUT',

                                                           'DELETE'])

@api.api_method(http_method='GET', user_required=True, logger=log)

def list_networks(request, detail=True):

    log.debug('list_networks detail=%s', detail)

    user_networks = Network.objects.filter(Q(userid=request.user_uniq) |

                                           Q(public=True))\

                                   .order_by('id')

    if detail:

        user_networks = user_networks.prefetch_related("subnets")

    user_networks = api.utils.filter_modified_since(request,

                                                    objects=user_networks)

    network_dicts = [network_to_dict(network, detail)

                     for network in user_networks]

    if request.serialization == 'xml':

        data = render_to_string('list_networks.xml', {

            "networks": network_dicts})

    else:

        data = json.dumps({'networks': network_dicts})

    return HttpResponse(data, status=200)

@api.api_method(http_method='POST', user_required=True, logger=log)

def create_network(request):

    userid = request.user_uniq

    req = api.utils.get_request_dict(request)

    log.info('create_network %s', req)

    network_dict = api.utils.get_attribute(req, "network")

    flavor = api.utils.get_attribute(network_dict, "type")

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

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

    if flavor not in settings.API_ENABLED_NETWORK_FLAVORS:

        raise api.faults.Forbidden("Cannot create network of type '%s'." %

                                   flavor)

    name = api.utils.get_attribute(network_dict, "name", required=False)

    if name is None:

        name = ""

    network = networks.create(userid=userid, name=name, flavor=flavor,

                              public=False)

    networkdict = network_to_dict(network, detail=True)

    response = render_network(request, networkdict, status=201)

    return response

@api.api_method(http_method='GET', user_required=True, logger=log)

def get_network_details(request, network_id):

    log.debug('get_network_details %s', network_id)

    network = util.get_network(network_id, request.user_uniq)

    return render_network(request, network_to_dict(network, detail=True))

@api.api_method(http_method='PUT', user_required=True, logger=log)

def update_network(request, network_id):

    info = api.utils.get_request_dict(request)

    network = api.utils.get_attribute(info, "network", required=True)

    new_name = api.utils.get_attribute(network, "name")

    network = util.get_network(network_id, request.user_uniq, for_update=True)

    if network.public:

        raise api.faults.Forbidden("Cannot rename the public network.")

    network = networks.rename(network, new_name)

    return render_network(request, network_to_dict(network), 200)

@api.api_method(http_method='DELETE', user_required=True, logger=log)

@transaction.commit_on_success

def delete_network(request, network_id):

    log.info('delete_network %s', network_id)

    network = util.get_network(network_id, request.user_uniq, for_update=True)

    if network.public:

        raise api.faults.Forbidden("Cannot delete the public network.")

    networks.delete(network)

    return HttpResponse(status=204)

def network_to_dict(network, detail=True):

    d = {'id': str(network.id), 'name': network.name}

    d['links'] = util.network_to_links(network.id)

    if detail:

        # Loop over subnets. Do not perform any extra query because of prefetch

        # related!

        subnet_ids = []

        for subnet in network.subnets.all():

            subnet_ids.append(network.id)

        state = "SNF:DRAINED" if network.drained else network.state

        d['user_id'] = network.userid

        d['tenant_id'] = network.userid

        d['type'] = network.flavor

        d['updated'] = api.utils.isoformat(network.updated)

        d['created'] = api.utils.isoformat(network.created)

        d['status'] = state

        d['public'] = network.public

        d['router:external'] = network.external_router

        d['admin_state_up'] = True

        d['subnets'] = subnet_ids

        d['SNF:floating_ip_pool'] = network.floating_ip_pool

    return d

def render_network(request, networkdict, status=200):

    if request.serialization == 'xml':

        data = render_to_string('network.xml', {'network': networkdict})

    else:

        data = json.dumps({'network': networkdict})

    return HttpResponse(data, status=status)