+ # If the position info is provided for all the interfaces, it will be sorted
+ # according to position number ascendingly.
+ if all(
+ i.get("position") + 1
+ for i in target_vdu["interfaces"]
+ if i.get("position") is not None
+ ):
+ sorted_interfaces = sorted(
+ target_vdu["interfaces"],
+ key=lambda x: (x.get("position") is None, x.get("position")),
+ )
+ target_vdu["interfaces"] = sorted_interfaces
+
+ # If the position info is provided for some interfaces but not all of them, the interfaces
+ # which has specific position numbers will be placed and others' positions will not be taken care.
+ else:
+ if any(
+ i.get("position") + 1
+ for i in target_vdu["interfaces"]
+ if i.get("position") is not None
+ ):
+ n = len(target_vdu["interfaces"])
+ sorted_interfaces = [-1] * n
+ k, m = 0, 0
+ while k < n:
+ if target_vdu["interfaces"][k].get("position"):
+ idx = target_vdu["interfaces"][k]["position"]
+ sorted_interfaces[idx - 1] = target_vdu["interfaces"][k]
+ k += 1
+ while m < n:
+ if not target_vdu["interfaces"][m].get("position"):
+ idy = sorted_interfaces.index(-1)
+ sorted_interfaces[idy] = target_vdu["interfaces"][m]
+ m += 1
+
+ target_vdu["interfaces"] = sorted_interfaces
+
+ # If the position info is not provided for the interfaces, interfaces will be attached
+ # according to the order in the VNFD.