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| import asyncio | |
| import json | |
| import logging | |
| import traceback | |
| from pydantic import BaseModel | |
| from fastapi import FastAPI, WebSocket, HTTPException, WebSocketDisconnect | |
| from fastapi.middleware.cors import CORSMiddleware | |
| from fastapi.responses import StreamingResponse, JSONResponse | |
| from fastapi.staticfiles import StaticFiles | |
| from diffusers import DiffusionPipeline, AutoencoderTiny | |
| from compel import Compel | |
| import torch | |
| try: | |
| import intel_extension_for_pytorch as ipex | |
| except: | |
| pass | |
| from PIL import Image | |
| import numpy as np | |
| import gradio as gr | |
| import io | |
| import uuid | |
| import os | |
| import time | |
| import psutil | |
| MAX_QUEUE_SIZE = int(os.environ.get("MAX_QUEUE_SIZE", 0)) | |
| TIMEOUT = float(os.environ.get("TIMEOUT", 0)) | |
| SAFETY_CHECKER = os.environ.get("SAFETY_CHECKER", None) | |
| TORCH_COMPILE = os.environ.get("TORCH_COMPILE", None) | |
| WIDTH = 768 | |
| HEIGHT = 768 | |
| # disable tiny autoencoder for better quality speed tradeoff | |
| USE_TINY_AUTOENCODER = False | |
| # check if MPS is available OSX only M1/M2/M3 chips | |
| mps_available = hasattr(torch.backends, "mps") and torch.backends.mps.is_available() | |
| xpu_available = hasattr(torch, "xpu") and torch.xpu.is_available() | |
| device = torch.device( | |
| "cuda" if torch.cuda.is_available() else "xpu" if xpu_available else "cpu" | |
| ) | |
| torch_device = device | |
| # change to torch.float16 to save GPU memory | |
| torch_dtype = torch.float32 | |
| print(f"TIMEOUT: {TIMEOUT}") | |
| print(f"SAFETY_CHECKER: {SAFETY_CHECKER}") | |
| print(f"MAX_QUEUE_SIZE: {MAX_QUEUE_SIZE}") | |
| print(f"device: {device}") | |
| if mps_available: | |
| device = torch.device("mps") | |
| torch_device = "cpu" | |
| torch_dtype = torch.float32 | |
| if SAFETY_CHECKER == "True": | |
| pipe = DiffusionPipeline.from_pretrained( | |
| "SimianLuo/LCM_Dreamshaper_v7", | |
| ) | |
| else: | |
| pipe = DiffusionPipeline.from_pretrained( | |
| "SimianLuo/LCM_Dreamshaper_v7", | |
| safety_checker=None, | |
| ) | |
| if USE_TINY_AUTOENCODER: | |
| pipe.vae = AutoencoderTiny.from_pretrained( | |
| "madebyollin/taesd", torch_dtype=torch_dtype, use_safetensors=True | |
| ) | |
| pipe.set_progress_bar_config(disable=True) | |
| pipe.to(device=torch_device, dtype=torch_dtype).to(device) | |
| pipe.unet.to(memory_format=torch.channels_last) | |
| # check if computer has less than 64GB of RAM using sys or os | |
| if psutil.virtual_memory().total < 64 * 1024**3: | |
| pipe.enable_attention_slicing() | |
| if TORCH_COMPILE: | |
| pipe.unet = torch.compile(pipe.unet, mode="reduce-overhead", fullgraph=True) | |
| pipe.vae = torch.compile(pipe.vae, mode="reduce-overhead", fullgraph=True) | |
| pipe(prompt="warmup", num_inference_steps=1, guidance_scale=8.0) | |
| compel_proc = Compel( | |
| tokenizer=pipe.tokenizer, | |
| text_encoder=pipe.text_encoder, | |
| truncate_long_prompts=False, | |
| ) | |
| user_queue_map = {} | |
| class InputParams(BaseModel): | |
| seed: int = 2159232 | |
| prompt: str | |
| guidance_scale: float = 8.0 | |
| strength: float = 0.5 | |
| steps: int = 4 | |
| lcm_steps: int = 50 | |
| width: int = WIDTH | |
| height: int = HEIGHT | |
| def predict(params: InputParams): | |
| generator = torch.manual_seed(params.seed) | |
| prompt_embeds = compel_proc(params.prompt) | |
| # Can be set to 1~50 steps. LCM support fast inference even <= 4 steps. Recommend: 1~8 steps. | |
| results = pipe( | |
| prompt_embeds=prompt_embeds, | |
| generator=generator, | |
| num_inference_steps=params.steps, | |
| guidance_scale=params.guidance_scale, | |
| width=params.width, | |
| height=params.height, | |
| original_inference_steps=params.lcm_steps, | |
| output_type="pil", | |
| ) | |
| nsfw_content_detected = ( | |
| results.nsfw_content_detected[0] | |
| if "nsfw_content_detected" in results | |
| else False | |
| ) | |
| if nsfw_content_detected: | |
| return None | |
| return results.images[0] | |
| app = FastAPI() | |
| app.add_middleware( | |
| CORSMiddleware, | |
| allow_origins=["*"], | |
| allow_credentials=True, | |
| allow_methods=["*"], | |
| allow_headers=["*"], | |
| ) | |
| async def websocket_endpoint(websocket: WebSocket): | |
| await websocket.accept() | |
| if MAX_QUEUE_SIZE > 0 and len(user_queue_map) >= MAX_QUEUE_SIZE: | |
| print("Server is full") | |
| await websocket.send_json({"status": "error", "message": "Server is full"}) | |
| await websocket.close() | |
| return | |
| try: | |
| uid = str(uuid.uuid4()) | |
| print(f"New user connected: {uid}") | |
| await websocket.send_json( | |
| {"status": "success", "message": "Connected", "userId": uid} | |
| ) | |
| user_queue_map[uid] = { | |
| "queue": asyncio.Queue(), | |
| } | |
| await websocket.send_json( | |
| {"status": "start", "message": "Start Streaming", "userId": uid} | |
| ) | |
| await handle_websocket_data(websocket, uid) | |
| except WebSocketDisconnect as e: | |
| logging.error(f"WebSocket Error: {e}, {uid}") | |
| traceback.print_exc() | |
| finally: | |
| print(f"User disconnected: {uid}") | |
| queue_value = user_queue_map.pop(uid, None) | |
| queue = queue_value.get("queue", None) | |
| if queue: | |
| while not queue.empty(): | |
| try: | |
| queue.get_nowait() | |
| except asyncio.QueueEmpty: | |
| continue | |
| async def get_queue_size(): | |
| queue_size = len(user_queue_map) | |
| return JSONResponse({"queue_size": queue_size}) | |
| async def stream(user_id: uuid.UUID): | |
| uid = str(user_id) | |
| try: | |
| user_queue = user_queue_map[uid] | |
| queue = user_queue["queue"] | |
| async def generate(): | |
| while True: | |
| params = await queue.get() | |
| if params is None: | |
| continue | |
| image = predict(params) | |
| if image is None: | |
| continue | |
| frame_data = io.BytesIO() | |
| image.save(frame_data, format="JPEG") | |
| frame_data = frame_data.getvalue() | |
| if frame_data is not None and len(frame_data) > 0: | |
| yield b"--frame\r\nContent-Type: image/jpeg\r\n\r\n" + frame_data + b"\r\n" | |
| await asyncio.sleep(1.0 / 120.0) | |
| return StreamingResponse( | |
| generate(), media_type="multipart/x-mixed-replace;boundary=frame" | |
| ) | |
| except Exception as e: | |
| logging.error(f"Streaming Error: {e}, {user_queue_map}") | |
| traceback.print_exc() | |
| return HTTPException(status_code=404, detail="User not found") | |
| async def handle_websocket_data(websocket: WebSocket, user_id: uuid.UUID): | |
| uid = str(user_id) | |
| user_queue = user_queue_map[uid] | |
| queue = user_queue["queue"] | |
| if not queue: | |
| return HTTPException(status_code=404, detail="User not found") | |
| last_time = time.time() | |
| try: | |
| while True: | |
| params = await websocket.receive_json() | |
| params = InputParams(**params) | |
| while not queue.empty(): | |
| try: | |
| queue.get_nowait() | |
| except asyncio.QueueEmpty: | |
| continue | |
| await queue.put(params) | |
| if TIMEOUT > 0 and time.time() - last_time > TIMEOUT: | |
| await websocket.send_json( | |
| { | |
| "status": "timeout", | |
| "message": "Your session has ended", | |
| "userId": uid, | |
| } | |
| ) | |
| await websocket.close() | |
| return | |
| except Exception as e: | |
| logging.error(f"Error: {e}") | |
| traceback.print_exc() | |
| app.mount("/", StaticFiles(directory="txt2img", html=True), name="public") | |