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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,
HTMLResponse,
FileResponse,
)
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=["*"],
)
@app.websocket("/ws")
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
@app.get("/queue_size")
async def get_queue_size():
queue_size = len(user_queue_map)
return JSONResponse({"queue_size": queue_size})
@app.get("/stream/{user_id}")
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.get("/", response_class=HTMLResponse)
async def root():
return FileResponse("./static/txt2img.html")
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