add subnet allocation from subnet pool on network creation

circle/circle/settings/base.py

@@ -577,3 +577,4 @@ DEFAULT_SUBNETPOOL_NAME_FOR_USER = "default"
 DEFAULT_SUBNETPOOL_PREFIXES = (
     "10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"
 )
+DEFAULT_SUBNETPOOL_PREFIX_LEN = 20
\ No newline at end of file

circle/network/models.py

@@ -80,14 +80,25 @@ class Vxlan(models.Model):
     def get_absolute_url(self):
         return reverse('network.vxlan', kwargs={'vni': self.vni})
 
-def create_subnet_pool(sender, user, request, **kwargs):
+class SubnetPool(object):
+    @classmethod
+    def get(cls, request):
         subnet_pools = openstack_api.neutron.subnetpool_list(request)
         subnet_pools = [sp for sp in subnet_pools if sp.name == settings.DEFAULT_SUBNETPOOL_NAME_FOR_USER]
-    if(len(subnet_pools) == 0):
+        return subnet_pools[0] if len(subnet_pools) > 0 else None
+
+    @classmethod
+    def create_if_not_exists(cls, sender, user, request, **kwargs):
+        if SubnetPool.get(request) is None:
             openstack_api.neutron.subnetpool_create(
                 request,
                 settings.DEFAULT_SUBNETPOOL_NAME_FOR_USER,
                 settings.DEFAULT_SUBNETPOOL_PREFIXES,
+                default_prefixlen=settings.DEFAULT_SUBNETPOOL_PREFIX_LEN
             )
 
-user_logged_in.connect(create_subnet_pool)
\ No newline at end of file
+    @classmethod
+    def get_id(cls, request):
+        return SubnetPool.get(request).id
+
+user_logged_in.connect(SubnetPool.create_if_not_exists)

circle/network/views.py

@@ -46,7 +46,7 @@ from firewall.models import (
     SwitchPort, EthernetDevice, Firewall
 )
 from netaddr import IPNetwork
-from network.models import Vxlan, EditorElement
+from network.models import Vxlan, EditorElement, SubnetPool
 from openstack_api.utils.lazy_encoder import LazyTranslationEncoder
 from vm.models import Interface, Instance
 
@@ -1002,8 +1002,20 @@ class VxlanCreate(LoginRequiredMixin, FormView):
         if form.cleaned_data['isAdvancedConfig']:
             pass
         else:
-            openstack_api.neutron.subnet_create(self.request, network_created.id, ip_version=4)
+            try:
+                raise Exception
                 # TODO: default ip version should read from SETTINGS
+                openstack_api.neutron.subnet_create(
+                    self.request,
+                    network_created.id,
+                    ip_version=4,
+                    subnetpool_id=SubnetPool.get_id(self.request)
+                )
+            except:
+                openstack_api.neutron.network_delete(self.request, network_created.id)
+                #TODO: user friendly error handling
+                raise Exception("Could not create subnet for network, deleted network.")
+
         return redirect(reverse_lazy('network.vxlan', kwargs={'pk': network_created.id}))
 
 class VxlanDelete(LoginRequiredMixin, DeleteView): #TODO: check user