Add a way to interrupt current processing in the backend.

comfy/model_management.py

@@ -162,3 +162,31 @@ def maximum_batch_area():
     memory_free = get_free_memory() / (1024 * 1024)
     area = ((memory_free - 1024) * 0.9) / (0.6)
     return int(max(area, 0))
+#TODO: might be cleaner to put this somewhere else
+import threading
+
+class InterruptProcessingException(Exception):
+    pass
+
+interrupt_processing_mutex = threading.RLock()
+
+interrupt_processing = False
+def interrupt_current_processing(value=True):
+    global interrupt_processing
+    global interrupt_processing_mutex
+    with interrupt_processing_mutex:
+        interrupt_processing = value
+
+def processing_interrupted():
+    global interrupt_processing
+    global interrupt_processing_mutex
+    with interrupt_processing_mutex:
+        return interrupt_processing
+
+def throw_exception_if_processing_interrupted():
+    global interrupt_processing
+    global interrupt_processing_mutex
+    with interrupt_processing_mutex:
+        if interrupt_processing:
+            interrupt_processing = False
+            raise InterruptProcessingException()

comfy/samplers.py

@@ -172,6 +172,8 @@ def sampling_function(model_function, x, timestep, uncond, cond, cond_scale, con
                 output = model_function(input_x, timestep_, cond=c).chunk(batch_chunks)
                 del input_x
 
+                model_management.throw_exception_if_processing_interrupted()
+
                 for o in range(batch_chunks):
                     if cond_or_uncond[o] == COND:
                         out_cond[:,:,area[o][2]:area[o][0] + area[o][2],area[o][3]:area[o][1] + area[o][3]] += output[o] * mult[o]

execution.py

@@ -58,6 +58,7 @@ def recursive_execute(server, prompt, outputs, current_item, extra_data={}):
         server.send_sync("executing", { "node": unique_id }, server.client_id)
     obj = class_def()
 
+    nodes.before_node_execution()
     outputs[unique_id] = getattr(obj, obj.FUNCTION)(**input_data_all)
     if "ui" in outputs[unique_id] and server.client_id is not None:
         server.send_sync("executed", { "node": unique_id, "output": outputs[unique_id]["ui"] }, server.client_id)

nodes.py

@@ -41,6 +41,13 @@ def recursive_search(directory):
 def filter_files_extensions(files, extensions):
     return sorted(list(filter(lambda a: os.path.splitext(a)[-1].lower() in extensions, files)))
 
+
+def before_node_execution():
+    model_management.throw_exception_if_processing_interrupted()
+
+def interrupt_processing():
+    model_management.interrupt_current_processing()
+
 class CLIPTextEncode:
     @classmethod
     def INPUT_TYPES(s):

server.py

@@ -140,7 +140,12 @@ class PromptServer():
                     self.prompt_queue.delete_queue_item(delete_func)
                     
             return web.Response(status=200)
-        
+
+        @routes.post("/interrupt")
+        async def post_interrupt(request):
+            nodes.interrupt_processing()
+            return web.Response(status=200)
+
         @routes.post("/history")
         async def post_history(request):
             json_data =  await request.json()