feat: added MetaHub Timer Node for accurate timing

timer_node.py

@@ -0,0 +1,78 @@
+"""
+MetaHub Timer Node for ComfyUI
+Measures workflow execution time from start to finish
+"""
+
+import time
+
+# Global storage for workflow timers
+_TIMER_START_TIMES = {}
+
+
+class MetaHubTimerNode:
+    """
+    Timer node that measures workflow execution time.
+
+    Usage:
+    1. Place this node at the START of your workflow
+    2. Connect any input (image, latent, conditioning, etc.) to trigger it early
+    3. Connect the 'elapsed_time' output to MetaHub Save Node's 'generation_time_override'
+
+    The timer starts when this node first executes in a workflow run.
+    """
+
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "required": {
+                # Accept any type as passthrough to ensure early execution
+                "trigger": ("*",),
+            },
+        }
+
+    RETURN_TYPES = ("*", "FLOAT")
+    RETURN_NAMES = ("passthrough", "elapsed_time")
+    FUNCTION = "measure_time"
+    CATEGORY = "image/save"
+    DESCRIPTION = "Measures workflow execution time for MetaHub Save Node"
+
+    def measure_time(self, trigger):
+        """
+        Measures elapsed time since workflow start.
+
+        Args:
+            trigger: Any input to trigger early execution (passed through unchanged)
+
+        Returns:
+            (passthrough, elapsed_time): Original input and elapsed time in seconds
+        """
+        current_time = time.time()
+
+        # Use trigger object ID as workflow identifier
+        # This works because ComfyUI reuses the same objects within a workflow execution
+        workflow_id = id(trigger)
+
+        # Start timer on first execution
+        if workflow_id not in _TIMER_START_TIMES:
+            _TIMER_START_TIMES[workflow_id] = current_time
+            print(f"[MetaHub Timer] Started timer for workflow")
+
+            # Cleanup old timers (keep only last 20)
+            if len(_TIMER_START_TIMES) > 20:
+                oldest_key = min(_TIMER_START_TIMES.keys(), key=lambda k: _TIMER_START_TIMES[k])
+                del _TIMER_START_TIMES[oldest_key]
+
+        # Calculate elapsed time
+        elapsed = current_time - _TIMER_START_TIMES[workflow_id]
+
+        # Passthrough the input unchanged + return elapsed time
+        return (trigger, elapsed)
+
+
+NODE_CLASS_MAPPINGS = {
+    "MetaHubTimerNode": MetaHubTimerNode
+}
+
+NODE_DISPLAY_NAME_MAPPINGS = {
+    "MetaHubTimerNode": "MetaHub Timer"
+}