views.py 文件源码

def alter_queryset(self, request):

        if request.GET.get('family') == '6':
            family = 6
            denominator = 2 ** 64  # Count /64s for IPv6 rather than individual IPs
        else:
            family = 4
            denominator = 1

        rirs = []
        for rir in self.queryset:

            stats = {
                'total': 0,
                'active': 0,
                'reserved': 0,
                'deprecated': 0,
                'available': 0,
            }
            aggregate_list = Aggregate.objects.filter(family=family, rir=rir)
            for aggregate in aggregate_list:

                queryset = Prefix.objects.filter(prefix__net_contained_or_equal=str(aggregate.prefix))

                # Find all consumed space for each prefix status (we ignore containers for this purpose).
                active_prefixes = netaddr.cidr_merge([p.prefix for p in queryset.filter(status=PREFIX_STATUS_ACTIVE)])
                reserved_prefixes = netaddr.cidr_merge([p.prefix for p in queryset.filter(status=PREFIX_STATUS_RESERVED)])
                deprecated_prefixes = netaddr.cidr_merge([p.prefix for p in queryset.filter(status=PREFIX_STATUS_DEPRECATED)])

                # Find all available prefixes by subtracting each of the existing prefix sets from the aggregate prefix.
                available_prefixes = (
                    netaddr.IPSet([aggregate.prefix]) -
                    netaddr.IPSet(active_prefixes) -
                    netaddr.IPSet(reserved_prefixes) -
                    netaddr.IPSet(deprecated_prefixes)
                )

                # Add the size of each metric to the RIR total.
                stats['total'] += aggregate.prefix.size / denominator
                stats['active'] += netaddr.IPSet(active_prefixes).size / denominator
                stats['reserved'] += netaddr.IPSet(reserved_prefixes).size / denominator
                stats['deprecated'] += netaddr.IPSet(deprecated_prefixes).size / denominator
                stats['available'] += available_prefixes.size / denominator

            # Calculate the percentage of total space for each prefix status.
            total = float(stats['total'])
            stats['percentages'] = {
                'active': float('{:.2f}'.format(stats['active'] / total * 100)) if total else 0,
                'reserved': float('{:.2f}'.format(stats['reserved'] / total * 100)) if total else 0,
                'deprecated': float('{:.2f}'.format(stats['deprecated'] / total * 100)) if total else 0,
            }
            stats['percentages']['available'] = (
                100 -
                stats['percentages']['active'] -
                stats['percentages']['reserved'] -
                stats['percentages']['deprecated']
            )
            rir.stats = stats
            rirs.append(rir)

        return rirs