Changed how a node class is cloned and locked for execution, added EXECUTE_NORMALIZED to wrap around execute function so that a NodeOutput is always returned

comfy_api/v3/io.py

@@ -5,6 +5,7 @@ from enum import Enum
 from abc import ABC, abstractmethod
 from dataclasses import dataclass, asdict
 from collections import Counter
+from comfy_execution.graph import ExecutionBlocker
 from comfy_api.v3.resources import Resources, ResourcesLocal
 import copy
 # used for type hinting
@@ -1043,6 +1044,40 @@ class classproperty(object):
         return self.f(owner)
 
 
+# NOTE: this was ai generated and validated by hand
+def shallow_clone_class(cls, new_name=None):
+    '''
+    Shallow clone a class.
+    '''
+    return type(
+        new_name or f"{cls.__name__}Clone",
+        cls.__bases__,
+        dict(cls.__dict__)
+    )
+
+# NOTE: this was ai generated and validated by hand
+def lock_class(cls):
+    '''
+    Lock a class so that its top-levelattributes cannot be modified.
+    '''
+    # Locked instance __setattr__
+    def locked_instance_setattr(self, name, value):
+        raise AttributeError(
+            f"Cannot set attribute '{name}' on immutable instance of {type(self).__name__}"
+        )
+    # Locked metaclass
+    class LockedMeta(type(cls)):
+        def __setattr__(cls_, name, value):
+            raise AttributeError(
+                f"Cannot modify class attribute '{name}' on locked class '{cls_.__name__}'"
+            )
+    # Rebuild class with locked behavior
+    locked_dict = dict(cls.__dict__)
+    locked_dict['__setattr__'] = locked_instance_setattr
+
+    return LockedMeta(cls.__name__, cls.__bases__, locked_dict)
+
+
 def add_to_dict_v1(i: InputV3, input: dict):
     key = "optional" if i.optional else "required"
     input.setdefault(key, {})[i.id] = (i.get_io_type_V1(), i.as_dict_V1())
@@ -1127,14 +1162,28 @@ class ComfyNodeV3:
             raise Exception(f"No execute function was defined for node class {cls.__name__}.")
 
     @classmethod
-    def prepare_class_clone(cls, hidden_inputs: dict, *args, **kwargs) -> type[ComfyNodeV3]:
+    def EXECUTE_NORMALIZED(cls, *args, **kwargs) -> NodeOutput:
+        to_return = cls.execute(*args, **kwargs)
+        if to_return is None:
+            return NodeOutput()
+        elif isinstance(to_return, NodeOutput):
+            return to_return
+        elif isinstance(to_return, tuple):
+            return NodeOutput(*to_return)
+        elif isinstance(to_return, dict):
+            return NodeOutput.from_dict(to_return)
+        elif isinstance(to_return, ExecutionBlocker):
+            return NodeOutput(block_execution=to_return.message)
+        else:
+            raise Exception(f"Invalid return type from node: {type(to_return)}")
+
+    @classmethod
+    def prepare_class_clone(cls, hidden_inputs: dict) -> type[ComfyNodeV3]:
         """Creates clone of real node class to prevent monkey-patching."""
         c_type: type[ComfyNodeV3] = cls if is_class(cls) else type(cls)
-        type_clone: type[ComfyNodeV3] = type(f"CLEAN_{c_type.__name__}", c_type.__bases__, {})
-        # TODO: what parameters should be carried over?
-        type_clone.SCHEMA = c_type.SCHEMA
+        type_clone: type[ComfyNodeV3] = shallow_clone_class(c_type)
+        # set hidden
         type_clone.hidden = HiddenHolder.from_dict(hidden_inputs)
-        # TODO: add anything we would want to expose inside node's execute function
         return type_clone
 
     #############################################
@@ -1224,7 +1273,7 @@ class ComfyNodeV3:
             cls.GET_SCHEMA()
         return cls._NOT_IDEMPOTENT
 
-    FUNCTION = "execute"
+    FUNCTION = "EXECUTE_NORMALIZED"
 
     @classmethod
     def INPUT_TYPES(cls, include_hidden=True, return_schema=False) -> dict[str, dict] | tuple[dict[str, dict], SchemaV3]:
@@ -1353,6 +1402,25 @@ class NodeOutput:
         # TODO: use kwargs to refer to outputs by id + organize in proper order
         return self.args if len(self.args) > 0 else None
 
+    @classmethod
+    def from_dict(cls, data: dict[str, Any]) -> "NodeOutput":
+        args = ()
+        ui = None   
+        expand = None
+        if "result" in data:
+            result = data["result"]
+            if isinstance(result, ExecutionBlocker):
+                return cls(block_execution=result.message)
+            args = result
+        if "ui" in data:
+            ui = data["ui"]
+        if "expand" in data:
+            expand = data["expand"]
+        return cls(args=args, ui=ui, expand=expand)
+
+    def __getitem__(self, index) -> Any:
+        return self.args[index]
+
 class _UIOutput(ABC):
     def __init__(self):
         pass

comfy_extras/nodes_v3_test.py

@@ -104,7 +104,10 @@ class V3TestNode(io.ComfyNodeV3):
             raise Exception("The 'cls' variable leaked instance state between runs!")
         if hasattr(cls, "doohickey"):
             raise Exception("The 'cls' variable leaked state on class properties between runs!")
+        try:
             cls.doohickey = "LOLJK"
+        except AttributeError:
+            pass
         return io.NodeOutput(some_int, image, ui=ui.PreviewImage(image, cls=cls))
 
 

execution.py

@@ -28,7 +28,7 @@ from comfy_execution.graph import (
 )
 from comfy_execution.graph_utils import GraphBuilder, is_link
 from comfy_execution.validation import validate_node_input
-from comfy_api.v3.io import NodeOutput, ComfyNodeV3, Hidden, NodeStateLocal, ResourcesLocal, AutogrowDynamic, is_class
+from comfy_api.v3.io import NodeOutput, ComfyNodeV3, Hidden, NodeStateLocal, ResourcesLocal, AutogrowDynamic, is_class, lock_class
 
 
 class ExecutionResult(Enum):
@@ -233,8 +233,8 @@ def _map_node_over_list(obj, input_data_all, func, allow_interrupt=False, execut
                 # otherwise, use class instance to populate/reuse some fields
                 else:
                     type_obj = type(obj)
-                    type(obj).VALIDATE_CLASS()
-                    class_clone = type(obj).prepare_class_clone(hidden_inputs)
+                    type_obj.VALIDATE_CLASS()
+                    class_clone = type_obj.prepare_class_clone(hidden_inputs)
                     # NOTE: this is a mock of state management; for local, just stores NodeStateLocal on node instance
                     if hasattr(obj, "local_state"):
                         if obj.local_state is None:
@@ -255,7 +255,7 @@ def _map_node_over_list(obj, input_data_all, func, allow_interrupt=False, execut
                             dynamic_list.append(real_inputs.pop(d.id, None))
                         dynamic_list = [x for x in dynamic_list if x is not None]
                         inputs = {**real_inputs, add_key: dynamic_list}
-                results.append(getattr(type_obj, func).__func__(class_clone, **inputs))
+                results.append(getattr(type_obj, func).__func__(lock_class(class_clone), **inputs))
             # V1
             else:
                 results.append(getattr(obj, func)(**inputs))