Fix some potential issues related to threads.

main.py

@@ -371,6 +371,18 @@ class PromptQueue:
                     return True
         return False
 
+    def get_history(self):
+        with self.mutex:
+            return copy.deepcopy(self.history)
+
+    def wipe_history(self):
+        with self.mutex:
+            self.history = {}
+
+    def delete_history_item(self, id_to_delete):
+        with self.mutex:
+            self.history.pop(id_to_delete, None)
+
 async def run(server, address='', port=8188):
     await asyncio.gather(server.start(address, port), server.publish_loop())
 

server.py

@@ -47,7 +47,7 @@ class PromptServer():
         @routes.get("/")
         async def get_root(request):
             return web.FileResponse(os.path.join(self.web_root, "index.html"))
-        
+
         @routes.get("/view/{file}")
         async def view_image(request):
             if "file" in request.match_info:
@@ -59,11 +59,11 @@ class PromptServer():
                     return web.FileResponse(file)
                 
             return web.Response(status=404)
-        
+
         @routes.get("/prompt")
         async def get_prompt(request):
             return web.json_response(self.get_queue_info())
-        
+
         @routes.get("/object_info")
         async def get_object_info(request):
             out = {}
@@ -79,11 +79,11 @@ class PromptServer():
                     info['category'] = obj_class.CATEGORY
                 out[x] = info
             return web.json_response(out)
-        
+
         @routes.get("/history")
         async def get_history(request):
-            return web.json_response(self.prompt_queue.history)
-        
+            return web.json_response(self.prompt_queue.get_history())
+
         @routes.get("/queue")
         async def get_queue(request):
             queue_info = {}
@@ -91,7 +91,7 @@ class PromptServer():
             queue_info['queue_running'] = current_queue[0]
             queue_info['queue_pending'] = current_queue[1]
             return web.json_response(queue_info)
-        
+
         @routes.post("/prompt")
         async def post_prompt(request):
             print("got prompt")
@@ -146,14 +146,14 @@ class PromptServer():
             json_data =  await request.json()
             if "clear" in json_data:
                 if json_data["clear"]:
-                    self.prompt_queue.history = {}
+                    self.prompt_queue.wipe_history()
             if "delete" in json_data:
                 to_delete = json_data['delete']
                 for id_to_delete in to_delete:
-                    self.prompt_queue.history.pop(id_to_delete, None)
-                    
+                    self.prompt_queue.delete_history_item(id_to_delete)
+
             return web.Response(status=200)
-    
+
         self.app.add_routes(routes)
         self.app.add_routes([
             web.static('/', self.web_root),
@@ -181,7 +181,7 @@ class PromptServer():
     def send_sync(self, event, data, sid=None):
         self.loop.call_soon_threadsafe(
             self.messages.put_nowait, (event, data, sid))
-    
+
     def queue_updated(self):
         self.send_sync("status", { "status": self.get_queue_info() })
 
@@ -195,8 +195,8 @@ class PromptServer():
         await runner.setup()
         site = web.TCPSite(runner, address, port)
         await site.start()
-    
+
         if address == '':
             address = '0.0.0.0'
         print("Starting server\n")
-        print("To see the GUI go to: http://{}:{}".format(address, port))   
+        print("To see the GUI go to: http://{}:{}".format(address, port))
\ No newline at end of file