better warnings

infra/blender/blender_slice_nodes_generic.py

@@ -126,13 +126,13 @@ class SliceNode(Node, AutoBlIdName):
         from ..debug import dump_node_execution
         return dump_node_execution(self, socket_name, output_val=None, duration_s=0.0)
 
-    def resolve(self, fieldname) -> Any:
+    def resolve(self, fieldname: str) -> Any:
         cache = getattr(self, "_current_cache", None)
         visited = getattr(self, "_current_visited", None)
         inputs = getattr(self, "inputs", None)
         if inputs is None:
-            return None
+            return resolve_input(None, cache=cache, visited=visited, fieldname=fieldname, node=self)
-        return resolve_input(inputs.get(fieldname), cache=cache, visited=visited)
+        return resolve_input(inputs.get(fieldname), cache=cache, visited=visited, fieldname=fieldname, node=self)
 
     def add_output(self, bl_idname: str, name: str = "", identifier: str = "", hide: bool = False, display_shape: str = "", description: str = ""):
         bl_idname = NATIVE_SOCKET_MAP.get(bl_idname, bl_idname)
@@ -175,12 +175,12 @@ class SliceNode(Node, AutoBlIdName):
         }
         self._update_multi_groups()
     
-    def resolve_multi_input(self, fieldname) -> Any:
+    def resolve_multi_input(self, fieldname: str) -> Any:
         cache = getattr(self, "_current_cache", None)
         visited = getattr(self, "_current_visited", None)
         # Search by name or identifier prefix for multi-groups
         inputs = [i for i in list(self.inputs) if i.name == fieldname or i.identifier.startswith(f"{fieldname}_ms_in_")]
-        return [resolve_input(r, cache=cache, visited=visited) for r in inputs]
+        return [resolve_input(r, cache=cache, visited=visited, fieldname=fieldname, node=self) for r in inputs]
 
     def _update_multi_groups(self):
         if not self.get('multi_groups'): return
@@ -582,14 +582,80 @@ def _follow_reroute(current: NodeSocket) -> NodeSocket:
 
     return current
 
+def _format_node_description(node: Any) -> str:
+    if node is None:
+        return ""
+    name = getattr(node, "name", "")
+    bl_label = getattr(node, "bl_label", "")
+    bl_idname = getattr(node, "bl_idname", "") or type(node).__name__
+
+    label = bl_label or bl_idname
+    if name and label and name != label:
+        return f"'{name}' ({label})"
+    elif name:
+        return f"'{name}'"
+    elif label:
+        return f"'{label}'"
+    return str(node)
+
+
+def _extract_caller_context() -> tuple[Any, str | None]:
+    try:
+        import sys
+        for depth in range(2, 6):
+            try:
+                frame = sys._getframe(depth)
+            except ValueError:
+                break
+            caller_self = frame.f_locals.get("self")
+            caller_node = None
+            if caller_self is not None and (
+                isinstance(caller_self, Node) or 
+                hasattr(caller_self, "bl_idname") or 
+                hasattr(caller_self, "inputs")
+            ):
+                caller_node = caller_self
+
+            caller_fieldname = (
+                frame.f_locals.get("fieldname") or 
+                frame.f_locals.get("socket_name") or 
+                frame.f_locals.get("name")
+            )
+            if not isinstance(caller_fieldname, str):
+                caller_fieldname = None
+
+            if caller_node is not None or caller_fieldname is not None:
+                return caller_node, caller_fieldname
+    except Exception:
+        pass
+    return None, None
+
+
 def resolve_input(
     socket: SliceNodeSocket | None,
     *,
     cache: _EvalCache | None = None,
     visited: _VisitedSet | None = None,
+    fieldname: str | None = None,
+    node: Any = None,
 ):
     if socket is None:
-        raise Exception(f"The queried socket is non-existant")
+        if node is None or fieldname is None:
+            caller_node, caller_fieldname = _extract_caller_context()
+            if node is None:
+                node = caller_node
+            if fieldname is None:
+                fieldname = caller_fieldname
+
+        node_str = _format_node_description(node)
+        if fieldname and node_str:
+            raise NodeException(f"The queried socket '{fieldname}' on node {node_str} is non-existent")
+        elif fieldname:
+            raise NodeException(f"The queried socket '{fieldname}' is non-existent")
+        elif node_str:
+            raise NodeException(f"The queried socket on node {node_str} is non-existent")
+        else:
+            raise NodeException("The queried socket is non-existent")
 
     assert socket.node
 

tests/test_debug.py

@@ -321,7 +321,40 @@ class TestNodeDebugSystem(unittest.TestCase):
             dump = node.dump_inputs("Val")
             self.assertEqual(dump["inputs"]["Val"]["value_summary"], 42.0)
 
+    def test_non_existent_socket_error_message_with_resolve(self):
+        from NodeSlicer.infra.blender.blender_slice_nodes_generic import NodeException
+
+        class TestNode(SliceNode):
+            bl_idname = "SLICENODE_Test"
+            bl_label = "Test Node"
+
+            def __init__(self):
+                self.name = "My Test Node"
+                self.inputs = DummySocketCollection([
+                    DummyNodeSocket("Valid", "Valid", "NodeSocketFloat", value=1.0)
+                ], node=self)
+
+        node = TestNode()
+        with self.assertRaises(NodeException) as ctx:
+            node.resolve("NonExistentSocket")
+
+        err_msg = str(ctx.exception)
+        self.assertIn("NonExistentSocket", err_msg)
+        self.assertIn("My Test Node", err_msg)
+        self.assertIn("Test Node", err_msg)
+        self.assertIn("non-existent", err_msg)
+
+    def test_non_existent_socket_error_message_isolated(self):
+        from NodeSlicer.infra.blender.blender_slice_nodes_generic import NodeException, resolve_input
+
+        with self.assertRaises(NodeException) as ctx:
+            resolve_input(None)
+
+        err_msg = str(ctx.exception)
+        self.assertIn("non-existent", err_msg)
+
 
 if __name__ == '__main__':
     unittest.main()
 
+