Synnefo

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

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#from django.conf import settings

import ipaddr

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.template.loader import render_to_string

from snf_django.lib import api

from snf_django.lib.api import faults

from synnefo.api import util

from synnefo.db.models import NetworkInterface

from synnefo.logic import servers, ips

from logging import getLogger

log = getLogger(__name__)

urlpatterns = patterns(

    'synnefo.api.ports',

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

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

    (r'^/([-\w]+)(?:/|.json|.xml)?$', 'port_demux'))

def demux(request):

    if request.method == 'GET':

        return list_ports(request)

    elif request.method == 'POST':

        return create_port(request)

    else:

        return api.api_method_not_allowed(request)

def port_demux(request, port_id):

    if request.method == 'GET':

        return get_port_details(request, port_id)

    elif request.method == 'DELETE':

        return delete_port(request, port_id)

    elif request.method == 'PUT':

        return update_port(request, port_id)

    else:

        return api.api_method_not_allowed(request)

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

def list_ports(request, detail=True):

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

    user_ports = NetworkInterface.objects.filter(userid=request.user_uniq)

    if detail:

        user_ports = user_ports.prefetch_related("ips")

    port_dicts = [port_to_dict(port, detail)

                  for port in user_ports.order_by('id')]

    if request.serialization == 'xml':

        data = render_to_string('list_ports.xml', {

            "ports": port_dicts})

    else:

        data = json.dumps({'ports': port_dicts})

    return HttpResponse(data, status=200)

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

@transaction.commit_on_success

def create_port(request):

    user_id = request.user_uniq

    req = api.utils.get_request_dict(request)

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

    port_dict = api.utils.get_attribute(req, "port")

    net_id = api.utils.get_attribute(port_dict, "network_id")

    device_id = api.utils.get_attribute(port_dict, "device_id", required=False)

    vm = None

    if device_id is not None:

        vm = util.get_vm(device_id, user_id, for_update=True, non_deleted=True,

                         non_suspended=True)

    # Check if the request contains a valid IPv4 address

    fixed_ips = api.utils.get_attribute(port_dict, "fixed_ips", required=False)

    if fixed_ips is not None and len(fixed_ips) > 0:

        if len(fixed_ips) > 1:

            msg = "'fixed_ips' attribute must contain only one fixed IP."

            raise faults.BadRequest(msg)

        fixed_ip_address = fixed_ips[0].get("ip_address")

        if fixed_ip_address is not None:

            try:

                ip = ipaddr.IPAddress(fixed_ip_address)

                if ip.version == 6:

                    msg = "'ip_address' can be only an IPv4 address'"

                    raise faults.BadRequest(msg)

            except ValueError:

                msg = "%s is not a valid IPv4 Address" % fixed_ip_address

                raise faults.BadRequest(msg)

    else:

        fixed_ip_address = None

    network = util.get_network(net_id, user_id, non_deleted=True,

                               for_update=True)

    ipaddress = None

    if network.public:

        # Creating a port to a public network is only allowed if the user has

        # already a floating IP address in this network which is specified

        # as the fixed IP address of the port

        if fixed_ip_address is None:

            msg = ("'fixed_ips' attribute must contain a floating IP address"

                   " in order to connect to a public network.")

            raise faults.BadRequest(msg)

        ipaddress = util.get_floating_ip_by_address(user_id, fixed_ip_address,

                                                    for_update=True)

    elif fixed_ip_address:

        ipaddress = ips.allocate_ip(network, user_id,

                                    address=fixed_ip_address)

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

    if name is None:

        name = ""

    security_groups = api.utils.get_attribute(port_dict,

                                              "security_groups",

                                              required=False)

    #validate security groups

    # like get security group from db

    sg_list = []

    if security_groups:

        for gid in security_groups:

            sg = util.get_security_group(int(gid))

            sg_list.append(sg)

    new_port = servers.create_port(user_id, network, use_ipaddress=ipaddress,

                                   machine=vm, name=name)

    response = render_port(request, port_to_dict(new_port), status=201)

    return response

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

def get_port_details(request, port_id):

    log.debug('get_port_details %s', port_id)

    port = util.get_port(port_id, request.user_uniq)

    return render_port(request, port_to_dict(port))

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

def update_port(request, port_id):

    '''

    You can update only name, security_groups

    '''

    port = util.get_port(port_id, request.user_uniq, for_update=True)

    req = api.utils.get_request_dict(request)

    port_info = api.utils.get_attribute(req, "port", required=True)

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

    if name:

        port.name = name

    security_groups = api.utils.get_attribute(port_info, "security_groups",

                                              required=False)

    if security_groups:

        sg_list = []

        #validate security groups

        for gid in security_groups:

            sg = util.get_security_group(int(gid))

            sg_list.append(sg)

        #clear the old security groups

        port.security_groups.clear()

        #add the new groups

        port.security_groups.add(*sg_list)

    port.save()

    return render_port(request, port_to_dict(port), 200)

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

@transaction.commit_on_success

def delete_port(request, port_id):

    log.info('delete_port %s', port_id)

    user_id = request.user_uniq

    port = util.get_port(port_id, user_id, for_update=True)

    # Deleting port that is connected to a public network is allowed only if

    # the port has an associated floating IP address.

    if port.network.public and not port.ips.filter(floating_ip=True,

                                                   deleted=False).exists():

        raise faults.Forbidden("Cannot disconnect from public network.")

    servers.delete_port(port)

    return HttpResponse(status=204)

#util functions

def port_to_dict(port, detail=True):

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

    d['links'] = util.port_to_links(port.id)

    if detail:

        user_id = port.userid

        machine_id = port.machine_id

        d['user_id'] = user_id

        d['tenant_id'] = user_id

        d['device_id'] = str(machine_id) if machine_id else None

        # TODO: Change this based on the status of VM

        d['admin_state_up'] = True

        d['mac_address'] = port.mac

        d['status'] = port.state

        d['device_owner'] = port.device_owner

        d['network_id'] = str(port.network_id)

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

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

        d['fixed_ips'] = []

        for ip in port.ips.all():

            d['fixed_ips'].append({"ip_address": ip.address,

                                   "subnet": str(ip.subnet_id)})

        # Avoid extra queries until security groups are implemented!

        #sg_list = list(port.security_groups.values_list('id', flat=True))

        d['security_groups'] = []

    return d

def render_port(request, portdict, status=200):

    if request.serialization == 'xml':

        data = render_to_string('port.xml', {'port': portdict})

    else:

        data = json.dumps({'port': portdict})

    return HttpResponse(data, status=status)