from fastapi import FastAPI, WebSocket, HTTPException, WebSocketDisconnect from fastapi.responses import StreamingResponse, JSONResponse from fastapi.middleware.cors import CORSMiddleware from fastapi.staticfiles import StaticFiles from fastapi import Request import markdown2 import logging import traceback from config import Args from user_queue import UserData import uuid import time from types import SimpleNamespace from util import pil_to_frame, bytes_to_pil, is_firefox import asyncio import os import time THROTTLE = 1.0 / 120 def init_app(app: FastAPI, user_data: UserData, args: Args, pipeline): app.add_middleware( CORSMiddleware, allow_origins=["*"], allow_credentials=True, allow_methods=["*"], allow_headers=["*"], ) @app.websocket("/api/ws") async def websocket_endpoint(websocket: WebSocket): await websocket.accept() user_count = user_data.get_user_count() if args.max_queue_size > 0 and user_count >= args.max_queue_size: print("Server is full") await websocket.send_json({"status": "error", "message": "Server is full"}) await websocket.close() return try: user_id = uuid.uuid4() print(f"New user connected: {user_id}") await user_data.create_user(user_id, websocket) await websocket.send_json( {"status": "connected", "message": "Connected", "userId": str(user_id)} ) await websocket.send_json({"status": "send_frame"}) await handle_websocket_data(user_id, websocket) except WebSocketDisconnect as e: logging.error(f"WebSocket Error: {e}, {user_id}") traceback.print_exc() finally: print(f"User disconnected: {user_id}") user_data.delete_user(user_id) async def handle_websocket_data(user_id: uuid.UUID, websocket: WebSocket): if not user_data.check_user(user_id): return HTTPException(status_code=404, detail="User not found") last_time = time.time() try: while True: if args.timeout > 0 and time.time() - last_time > args.timeout: await websocket.send_json( { "status": "timeout", "message": "Your session has ended", "userId": str(user_id), } ) await websocket.close() return data = await websocket.receive_json() if data["status"] != "next_frame": asyncio.sleep(THROTTLE) continue params = await websocket.receive_json() params = pipeline.InputParams(**params) info = pipeline.Info() params = SimpleNamespace(**params.dict()) if info.input_mode == "image": image_data = await websocket.receive_bytes() if len(image_data) == 0: await websocket.send_json({"status": "send_frame"}) await asyncio.sleep(THROTTLE) continue params.image = bytes_to_pil(image_data) await user_data.update_data(user_id, params) await websocket.send_json({"status": "wait"}) except Exception as e: logging.error(f"Error: {e}") traceback.print_exc() @app.get("/api/queue") async def get_queue_size(): queue_size = user_data.get_user_count() return JSONResponse({"queue_size": queue_size}) @app.get("/api/stream/{user_id}") async def stream(user_id: uuid.UUID, request: Request): try: async def generate(): websocket = user_data.get_websocket(user_id) last_params = SimpleNamespace() while True: last_time = time.time() params = await user_data.get_latest_data(user_id) if not vars(params) or params.__dict__ == last_params.__dict__: await websocket.send_json({"status": "send_frame"}) await asyncio.sleep(THROTTLE) continue last_params = params image = pipeline.predict(params) if image is None: await websocket.send_json({"status": "send_frame"}) await asyncio.sleep(THROTTLE) continue frame = pil_to_frame(image) yield frame # https://bugs.chromium.org/p/chromium/issues/detail?id=1250396 if not is_firefox(request.headers["user-agent"]): yield frame await websocket.send_json({"status": "send_frame"}) if args.debug: print(f"Time taken: {time.time() - last_time}") return StreamingResponse( generate(), media_type="multipart/x-mixed-replace;boundary=frame", headers={"Cache-Control": "no-cache"}, ) except Exception as e: logging.error(f"Streaming Error: {e}, {user_id} ") traceback.print_exc() return HTTPException(status_code=404, detail="User not found") # route to setup frontend @app.get("/api/settings") async def settings(): info_schema = pipeline.Info.schema() info = pipeline.Info() if info.page_content: page_content = markdown2.markdown(info.page_content) input_params = pipeline.InputParams.schema() return JSONResponse( { "info": info_schema, "input_params": input_params, "max_queue_size": args.max_queue_size, "page_content": page_content if info.page_content else "", } ) if not os.path.exists("public"): os.makedirs("public") app.mount("/", StaticFiles(directory="public", html=True), name="public")