Synnefo

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

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#      disclaimer.

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#   2. Redistributions in binary form must reproduce the above

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#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

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

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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

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

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from django.conf.urls.defaults import patterns

from django.db.models import Q

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, OverLimit, Unauthorized

from synnefo.db.models import Network

from synnefo.logic import backend

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, detail=True):

    network_id = str(network.id) if not network.public else 'public'

    d = {'id': network_id, 'name': network.name}

    if detail:

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

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

        d['servers'] = {'values': [vm.id for vm in network.machines.all()]}

        d['status'] = network.state

    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)

    owner = request.user

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

    user_networks = Network.objects.filter(Q(owner=owner) | 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(state='ACTIVE')

    networks = [network_to_dict(network, 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')

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)

    try:

        d = req['network']

        name = d['name']

    except (KeyError, ValueError):

        raise BadRequest('Malformed request.')

    network = backend.create_network(name, request.user)

    if not network:

        raise OverLimit('Maximum number of networks reached.')

    networkdict = network_to_dict(network)

    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)

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

    netdict = network_to_dict(net)

    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)

    try:

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

    except (TypeError, KeyError):

        raise BadRequest('Malformed request.')

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

    if net.public:

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

    net.name = name

    net.save()

    return HttpResponse(status=204)

@util.api_method('DELETE')

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)

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

    if net.public:

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

    backend.delete_network(net)

    return HttpResponse(status=204)

@util.api_method('POST')

def network_action(request, network_id):

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

    if net.public:

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

    req = util.get_request_dict(request)

    if len(req) != 1:

        raise BadRequest('Malformed request.')

    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.')