share hashcode implementation

yacv_server/server.py

@@ -162,7 +162,7 @@ class Server:
         """Publishes any single-file GLTF object to the server (GLB format recommended)."""
         start = time.time()
         # Precompute the info and send it to the client as if it was a CAD object
-        precomputed_info = self._show_common(name, hashlib.md5(gltf).hexdigest(), start)
+        precomputed_info = self._show_common(name, _hashcode(gltf, **kwargs), start)
         # Also pre-populate the GLTF data for the object API
         publish_to = BufferedPubSub[bytes]()
         publish_to.publish_nowait(gltf)
@@ -191,7 +191,7 @@ class Server:
         # Convert Z-up (OCCT convention) to Y-up (GLTF convention)
         obj = Shape(obj).rotate(Axis.X, -90).wrapped
 
-        self._show_common(name, _hashcode(obj), start, obj)
+        self._show_common(name, _hashcode(obj, **kwargs), start, obj)
 
     async def _api_object(self, request: web.Request) -> web.Response:
         """Returns the object file with the matching name, building it if necessary."""

yacv_server/tessellate.py

@@ -1,7 +1,7 @@
 import hashlib
 import io
 import re
-from typing import List, Dict, Tuple
+from typing import List, Dict, Tuple, Union
 
 from OCP.BRep import BRep_Tool
 from OCP.BRepAdaptor import BRepAdaptor_Curve
@@ -123,13 +123,19 @@ def _tessellate_vertex(mgr: GLTFMgr, ocp_vertex: TopoDS_Vertex, faces: List[Topo
     mgr.add_vertex(_push_point((c.X, c.Y, c.Z), faces))
 
 
-def _hashcode(obj: TopoDS_Shape) -> str:
+def _hashcode(obj: Union[bytes, TopoDS_Shape], **extras) -> str:
     """Utility to compute the hash code of a shape recursively without the need to tessellate it"""
     # NOTE: obj.HashCode(MAX_HASH_CODE) is not stable across different runs of the same program
     # This is best-effort and not guaranteed to be unique
     map_of_shapes = TopTools_IndexedMapOfShape()
     TopExp.MapShapes_s(obj, map_of_shapes)
     hasher = hashlib.md5(usedforsecurity=False)
+    for k, v in extras.items():
+        hasher.update(str(k).encode())
+        hasher.update(str(v).encode())
+    if isinstance(obj, bytes):
+        hasher.update(obj)
+    else:
         for i in range(1, map_of_shapes.Extent() + 1):
             sub_shape = map_of_shapes.FindKey(i)
             sub_data = io.BytesIO()