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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
from pipelines.utils.safety_checker import SafetyChecker
from PIL import Image
import logging
from config import config, Args
from connection_manager import ConnectionManager, ServerFullException
import uuid
from uuid import UUID
import time
from typing import Any, Protocol, runtime_checkable
from util import pil_to_frame, bytes_to_pil, is_firefox, get_pipeline_class, ParamsModel
from device import device, torch_dtype
import asyncio
import os
import time
import torch
from pydantic import BaseModel, create_model
@runtime_checkable
class BasePipeline(Protocol):
class Info:
@classmethod
def schema(cls) -> dict[str, Any]:
...
page_content: str | None
input_mode: str
class InputParams(ParamsModel):
@classmethod
def schema(cls) -> dict[str, Any]:
...
def dict(self) -> dict[str, Any]:
...
def predict(self, params: ParamsModel) -> Image.Image | None:
...
THROTTLE = 1.0 / 120
class App:
def __init__(self, config: Args, pipeline_instance: BasePipeline):
self.args = config
self.pipeline = pipeline_instance
self.app = FastAPI()
self.conn_manager = ConnectionManager()
self.safety_checker: SafetyChecker | None = None
if self.args.safety_checker:
self.safety_checker = SafetyChecker(device=device.type)
self.init_app()
def init_app(self) -> None:
self.app.add_middleware(
CORSMiddleware,
allow_origins=["*"],
allow_credentials=True,
allow_methods=["*"],
allow_headers=["*"],
)
@self.app.websocket("/api/ws/{user_id}")
async def websocket_endpoint(user_id: UUID, websocket: WebSocket) -> None:
try:
await self.conn_manager.connect(
user_id, websocket, self.args.max_queue_size
)
await handle_websocket_data(user_id)
except ServerFullException as e:
logging.error(f"Server Full: {e}")
finally:
await self.conn_manager.disconnect(user_id)
logging.info(f"User disconnected: {user_id}")
async def handle_websocket_data(user_id: UUID) -> None:
if not self.conn_manager.check_user(user_id):
raise HTTPException(status_code=404, detail="User not found")
last_time = time.time()
try:
while True:
if (
self.args.timeout > 0
and time.time() - last_time > self.args.timeout
):
await self.conn_manager.send_json(
user_id,
{
"status": "timeout",
"message": "Your session has ended",
},
)
await self.conn_manager.disconnect(user_id)
return
data = await self.conn_manager.receive_json(user_id)
if data is None:
continue
if data["status"] == "next_frame":
info = self.pipeline.Info()
params_data = await self.conn_manager.receive_json(user_id)
if params_data is None:
continue
params = self.pipeline.InputParams.model_validate(params_data)
if info.input_mode == "image":
image_data = await self.conn_manager.receive_bytes(user_id)
if image_data is None or len(image_data) == 0:
await self.conn_manager.send_json(
user_id, {"status": "send_frame"}
)
continue
# Create a new Pydantic model with the image field
params_dict = params.model_dump()
params_dict["image"] = bytes_to_pil(image_data)
params = self.pipeline.InputParams.model_validate(params_dict)
await self.conn_manager.update_data(user_id, params)
await self.conn_manager.send_json(user_id, {"status": "wait"})
except Exception as e:
logging.error(f"Websocket Error: {e}, {user_id} ")
await self.conn_manager.disconnect(user_id)
@self.app.get("/api/queue")
async def get_queue_size() -> JSONResponse:
queue_size = self.conn_manager.get_user_count()
return JSONResponse({"queue_size": queue_size})
@self.app.get("/api/stream/{user_id}")
async def stream(user_id: UUID, request: Request) -> StreamingResponse:
try:
async def generate() -> bytes:
last_params: ParamsModel | None = None
while True:
last_time = time.time()
await self.conn_manager.send_json(
user_id, {"status": "send_frame"}
)
params = await self.conn_manager.get_latest_data(user_id)
if (params is None or
(last_params is not None and
params.model_dump() == last_params.model_dump())):
await asyncio.sleep(THROTTLE)
continue
last_params = params
image = self.pipeline.predict(params)
if self.args.safety_checker and self.safety_checker is not None and image is not None:
image, has_nsfw_concept = self.safety_checker(image)
if has_nsfw_concept:
image = None
if image is None:
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
if self.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} ")
raise HTTPException(status_code=404, detail="User not found")
# route to setup frontend
@self.app.get("/api/settings")
async def settings() -> JSONResponse:
info_schema = self.pipeline.Info.schema()
info = self.pipeline.Info()
page_content = ""
if hasattr(info, 'page_content') and info.page_content:
page_content = markdown2.markdown(info.page_content)
input_params = self.pipeline.InputParams.schema()
return JSONResponse(
{
"info": info_schema,
"input_params": input_params,
"max_queue_size": self.args.max_queue_size,
"page_content": page_content,
}
)
if not os.path.exists("public"):
os.makedirs("public")
self.app.mount(
"/", StaticFiles(directory="frontend/public", html=True), name="public"
)
# def create_app(config):
# print(f"Device: {device}")
# print(f"torch_dtype: {torch_dtype}")
# # Create pipeline once
# pipeline_class = get_pipeline_class(config.pipeline)
# pipeline_instance = pipeline_class(config, device, torch_dtype)
# # Pass the existing pipeline instance to App
# app = App(config, pipeline_instance).app
# return app
# Create app instance at module level
print(f"Device: {device}")
print(f"torch_dtype: {torch_dtype}")
pipeline_class = get_pipeline_class(config.pipeline)
pipeline_instance = pipeline_class(config, device, torch_dtype)
app = App(config, pipeline_instance).app # This creates the FastAPI app instance
if __name__ == "__main__":
import uvicorn
# app = create_app(config) # Create the app once
uvicorn.run(
app,
host=config.host,
port=config.port,
reload=config.reload,
ssl_certfile=config.ssl_certfile,
ssl_keyfile=config.ssl_keyfile,
)
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