views.py 文件源码

def post(self, request):
        if not (request.POST.get('uuid') and
                request.POST.get('long') and
                request.POST.get('lat') and
                request.POST.get('bands')
        ):
            return Response("Missing arguments", status=status.HTTP_406_NOT_ACCEPTABLE)

        req_bands = request.POST.get('bands').split(',')
        for band in req_bands:
            if not (band in BTS.bands):
                return Response("Invalid Arguments", status=status.HTTP_400_BAD_REQUEST)

        pnt = GEOSGeometry(Point(float(request.POST.get('long')),
                                 float(request.POST.get('lat'))))

        with transaction.atomic():
            tower = BTS.objects.get(uuid=request.POST.get('uuid'))
            nearby_towers = BTS.objects.filter(
                location__distance_lt=(pnt,D(km=RANGE))).exclude(uuid=request.POST.get('uuid'))
            used_channels = dict.fromkeys(BTS.bands.keys(), set())
            for tower in nearby_towers:
                if (tower.band): #skip those without set bands
                    used_channels[tower.band].add(tower.channel)
            free_channels = dict.fromkeys(req_bands)
            for band in req_bands:
                free_channels[band] = BTS.bands[band]['valid_values'].difference(used_channels[band])
                if (len(free_channels[band]) > 0): #something available
                    return Response({ band : free_channels[band],
                                      'power_level' : POWER_LEVEL},
                                    status=status.HTTP_200_OK)
            return Response("No Available Bands", status=status.HTTP_404_NOT_FOUND)