Add fingerprint_inputs support (V3's IS_CHANGED)

comfy_api/v3/io.py

@@ -844,7 +844,9 @@ class HiddenHolder:
         return None
     
     @classmethod
-    def from_dict(cls, d: dict):
+    def from_dict(cls, d: dict | None):
+        if d is None:
+            d = {}
         return cls(
             unique_id=d.get(Hidden.unique_id, None),
             prompt=d.get(Hidden.prompt, None),

comfy_extras/nodes_v3_test.py

@@ -1,4 +1,5 @@
 import torch
+import time
 from comfy_api.v3 import io, ui, resources
 import logging
 import folder_paths
@@ -176,6 +177,10 @@ class NInputsTest(io.ComfyNodeV3):
     def validate_inputs(cls, nmock, nmock2):
         return True
 
+    @classmethod
+    def fingerprint_inputs(cls, nmock, nmock2):
+        return time.time()
+
     @classmethod
     def check_lazy_status(cls, **kwargs) -> list[str]:
         need = [name for name in kwargs if kwargs[name] is None]

execution.py

@@ -52,7 +52,15 @@ class IsChangedCache:
         node = self.dynprompt.get_node(node_id)
         class_type = node["class_type"]
         class_def = nodes.NODE_CLASS_MAPPINGS[class_type]
-        if not hasattr(class_def, "IS_CHANGED"):
+        has_is_changed = False
+        is_changed_name = None
+        if issubclass(class_def, ComfyNodeV3) and getattr(class_def, "fingerprint_inputs", None) is not None:
+            has_is_changed = True
+            is_changed_name = "fingerprint_inputs"
+        elif hasattr(class_def, "IS_CHANGED"):
+            has_is_changed = True
+            is_changed_name = "IS_CHANGED"
+        if not has_is_changed:
             self.is_changed[node_id] = False
             return self.is_changed[node_id]
 
@@ -63,7 +71,7 @@ class IsChangedCache:
         # Intentionally do not use cached outputs here. We only want constants in IS_CHANGED
         input_data_all, _, hidden_inputs = get_input_data(node["inputs"], class_def, node_id, None)
         try:
-            is_changed = _map_node_over_list(class_def, input_data_all, "IS_CHANGED")
+            is_changed = _map_node_over_list(class_def, input_data_all, is_changed_name)
             node["is_changed"] = [None if isinstance(x, ExecutionBlocker) else x for x in is_changed]
         except Exception as e:
             logging.warning("WARNING: {}".format(e))