Synnefo

# Copyright 2011-2012 GRNET S.A. All rights reserved.

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from logging import getLogger

from django.conf.urls.defaults import patterns

from django.conf import settings

from django.db.models import Q

from django.db import transaction

from django.http import HttpResponse

from django.template.loader import render_to_string

from django.utils import simplejson as json

from synnefo.api import util

from synnefo.api.actions import network_actions

from synnefo.api.common import method_not_allowed

from synnefo.api.faults import (BadRequest, Unauthorized,

                                NetworkInUse, OverLimit)

from synnefo.db.models import Network

from synnefo.db.pools import EmptyPool

from synnefo.logic import backend

log = getLogger('synnefo.api')

urlpatterns = patterns('synnefo.api.networks',

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

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

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

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

)

def demux(request):

    if request.method == 'GET':

        return list_networks(request)

    elif request.method == 'POST':

        return create_network(request)

    else:

        return method_not_allowed(request)

def network_demux(request, network_id):

    if request.method == 'GET':

        return get_network_details(request, network_id)

    elif request.method == 'PUT':

        return update_network_name(request, network_id)

    elif request.method == 'DELETE':

        return delete_network(request, network_id)

    else:

        return method_not_allowed(request)

def network_to_dict(network, user_id, detail=True):

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

    if detail:

        d['cidr'] = network.subnet

        d['cidr6'] = network.subnet6

        d['gateway'] = network.gateway

        d['gateway6'] = network.gateway6

        d['dhcp'] = network.dhcp

        d['type'] = network.type

        d['updated'] = util.isoformat(network.updated)

        d['created'] = util.isoformat(network.created)

        d['status'] = network.state

        d['public'] = network.public

        attachments = [util.construct_nic_id(nic)

                       for nic in network.nics.filter(machine__userid=user_id)]

        d['attachments'] = {'values': attachments}

    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)

@util.api_method('GET')

def list_networks(request, detail=False):

    # Normal Response Codes: 200, 203

    # Error Response Codes: computeFault (400, 500),

    #                       serviceUnavailable (503),

    #                       unauthorized (401),

    #                       badRequest (400),

    #                       overLimit (413)

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

    since = util.isoparse(request.GET.get('changes-since'))

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

                                           Q(public=True))

    if since:

        user_networks = user_networks.filter(updated__gte=since)

        if not user_networks:

            return HttpResponse(status=304)

    else:

        user_networks = user_networks.filter(deleted=False)

    networks = [network_to_dict(network, request.user_uniq, detail)

                for network in user_networks]

    if request.serialization == 'xml':

        data = render_to_string('list_networks.xml', {

            'networks': networks,

            'detail': detail})

    else:

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

    return HttpResponse(data, status=200)

@util.api_method('POST')

@transaction.commit_on_success

def create_network(request):

    # Normal Response Code: 202

    # Error Response Codes: computeFault (400, 500),

    #                       serviceUnavailable (503),

    #                       unauthorized (401),

    #                       badMediaType(415),

    #                       badRequest (400),

    #                       overLimit (413)

    req = util.get_request_dict(request)

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

    try:

        d = req['network']

        name = d['name']

        # TODO: Fix this temp values:

        subnet = d.get('cidr', '192.168.1.0/24')

        subnet6 = d.get('cidr6', None)

        gateway = d.get('gateway', None)

        gateway6 = d.get('gateway6', None)

        net_type = d.get('type', 'PRIVATE_MAC_FILTERED')

        dhcp = d.get('dhcp', True)

    except (KeyError, ValueError):

        raise BadRequest('Malformed request.')

    if net_type == 'PUBLIC_ROUTED':

        raise Unauthorized('Can not create a public network.')

    user_networks = len(Network.objects.filter(userid=request.user_uniq,

                                               deleted=False))

    if user_networks == settings.MAX_NETWORKS_PER_USER:

        raise OverLimit('Network count limit exceeded for your account.')

    cidr_block = int(subnet.split('/')[1])

    if not util.validate_network_size(cidr_block):

        raise OverLimit("Unsupported network size.")

    try:

        link, mac_prefix = util.net_resources(net_type)

        if not link:

            raise Exception("Can not create network. No connectivity link.")

        network = Network.objects.create(

                name=name,

                userid=request.user_uniq,

                subnet=subnet,

                subnet6=subnet6,

                gateway=gateway,

                gateway6=gateway6,

                dhcp=dhcp,

                type=net_type,

                link=link,

                mac_prefix=mac_prefix,

                action='CREATE',

                state='PENDING')

    except EmptyPool:

        raise OverLimit('Network count limit exceeded.')

    # Create BackendNetwork entries for each Backend

    network.create_backend_network()

    # Create the network in the actual backends

    backend.create_network(network)

    networkdict = network_to_dict(network, request.user_uniq)

    return render_network(request, networkdict, status=202)

@util.api_method('GET')

def get_network_details(request, network_id):

    # Normal Response Codes: 200, 203

    # Error Response Codes: computeFault (400, 500),

    #                       serviceUnavailable (503),

    #                       unauthorized (401),

    #                       badRequest (400),

    #                       itemNotFound (404),

    #                       overLimit (413)

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

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

    netdict = network_to_dict(net, request.user_uniq)

    return render_network(request, netdict)

@util.api_method('PUT')

def update_network_name(request, network_id):

    # Normal Response Code: 204

    # Error Response Codes: computeFault (400, 500),

    #                       serviceUnavailable (503),

    #                       unauthorized (401),

    #                       badRequest (400),

    #                       badMediaType(415),

    #                       itemNotFound (404),

    #                       overLimit (413)

    req = util.get_request_dict(request)

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

    try:

        name = req['network']['name']

    except (TypeError, KeyError):

        raise BadRequest('Malformed request.')

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

    if net.public:

        raise Unauthorized('Can not rename the public network.')

    net.name = name

    net.save()

    return HttpResponse(status=204)

@util.api_method('DELETE')

@transaction.commit_on_success

def delete_network(request, network_id):

    # Normal Response Code: 204

    # Error Response Codes: computeFault (400, 500),

    #                       serviceUnavailable (503),

    #                       unauthorized (401),

    #                       itemNotFound (404),

    #                       unauthorized (401),

    #                       overLimit (413)

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

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

    if net.public:

        raise Unauthorized('Can not delete the public network.')

    if net.machines.all():  # Nics attached on network

        raise NetworkInUse('Machines are connected to network.')

    net.action = 'DESTROY'

    net.save()

    backend.delete_network(net)

    return HttpResponse(status=204)

@util.api_method('POST')

def network_action(request, network_id):

    req = util.get_request_dict(request)

    log.debug('network_action %s %s', network_id, req)

    if len(req) != 1:

        raise BadRequest('Malformed request.')

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

    if net.public:

        raise Unauthorized('Can not modify the public network.')

    key = req.keys()[0]

    val = req[key]

    try:

        assert isinstance(val, dict)

        return network_actions[key](request, net, req[key])

    except KeyError:

        raise BadRequest('Unknown action.')

    except AssertionError:

        raise BadRequest('Invalid argument.')