[vpn] implement creating vpns

uncloud_net/selectors.py

@@ -4,7 +4,10 @@ from django.db.models import Count, F
 
 from .models import *
 
-def get_suitable_pool(subnetwork_mask):
+# def get_num_used_networks(pool):
+#     return pool.wireguardvpn_set.count()
+
+def get_suitable_pools(subnetwork_mask):
     """
     Find suitable pools for a certain network size.
 
@@ -42,3 +45,16 @@ def allowed_vpn_network_reservation_size():
     # Need to return set of tuples, see
     # https://docs.djangoproject.com/en/3.1/ref/models/fields/#field-choices
     return set([ (pool.subnetwork_mask, pool.subnetwork_mask) for pool in pools ])
+
+
+#def get_next_vpnnetwork(pool):
+    # get all associated networks
+    # look for the lowest free number
+    # return that
+
+
+    # select last used one
+    # try to increment by one -> get new network
+
+    # if that fails search through the existing vpns for the first unused number
+    #