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app.py
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125 lines (105 loc) · 4.01 KB
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from __future__ import annotations
import asyncio
import contextlib
import logging
from pathlib import Path
from fastapi import FastAPI, Request
from fastapi.exception_handlers import request_validation_exception_handler
from fastapi.exceptions import RequestValidationError
from fastapi.responses import JSONResponse
from fastapi.staticfiles import StaticFiles
from core.errors import OpenAIAPIError, openai_error_payload
from providers.doubao.router import (
DOUBAO_ROUTE_PREFIX,
DOUBAO_VIDEO_GENERATION_PATHS,
router as doubao_router,
service as doubao_service,
)
from providers.dyks.router import (
DYKS_ROUTE_PREFIX,
router as dyks_router,
)
from providers.flow.router import (
FLOW_IMAGE_GENERATION_PATHS,
FLOW_ROUTE_PREFIX,
FLOW_VIDEO_GENERATION_PATHS,
router as flow_router,
)
_WEB_DIST = Path(__file__).parent / "web" / "dist"
_DOUBAO_QUOTA_SYNC_INTERVAL_SEC = 30.0
app = FastAPI(
title="Local Browser API Proxy",
version="0.3.0",
description="Local-only browser automation API proxy container. Flow, Doubao and Dyks are currently implemented.",
)
app.include_router(flow_router)
app.include_router(doubao_router)
app.include_router(dyks_router)
@app.on_event("startup")
async def _startup_background_tasks() -> None:
doubao_service.refresh_daily_quota_cache()
app.state.doubao_quota_maintenance_task = asyncio.create_task(_maintain_doubao_quota_cache())
@app.on_event("shutdown")
async def _shutdown_background_tasks() -> None:
task = getattr(app.state, "doubao_quota_maintenance_task", None)
if task is None:
return
task.cancel()
with contextlib.suppress(asyncio.CancelledError):
await task
async def _maintain_doubao_quota_cache() -> None:
log = logging.getLogger("app.startup")
while True:
try:
doubao_service.refresh_daily_quota_cache()
except Exception as exc:
log.warning("Doubao daily quota cache maintenance failed: %s", exc)
await asyncio.sleep(_DOUBAO_QUOTA_SYNC_INTERVAL_SEC)
if _WEB_DIST.is_dir():
app.mount("/ui", StaticFiles(directory=str(_WEB_DIST), html=True), name="react-ui")
@app.exception_handler(OpenAIAPIError)
async def handle_openai_api_error(_: Request, exc: OpenAIAPIError) -> JSONResponse:
return JSONResponse(status_code=exc.status_code, content=openai_error_payload(exc))
@app.exception_handler(RequestValidationError)
async def handle_validation_error(request: Request, exc: RequestValidationError):
if request.url.path not in FLOW_IMAGE_GENERATION_PATHS | FLOW_VIDEO_GENERATION_PATHS | DOUBAO_VIDEO_GENERATION_PATHS:
return await request_validation_exception_handler(request, exc)
first = exc.errors()[0] if exc.errors() else {}
loc = tuple(first.get("loc") or ())
param = str(loc[1]) if len(loc) >= 2 and loc[0] == "body" else None
message = first.get("msg", "Invalid request body.")
api_error = OpenAIAPIError(
status_code=400,
message=message,
error_type="invalid_request_error",
param=param,
code="invalid_request",
)
return JSONResponse(status_code=api_error.status_code, content=openai_error_payload(api_error))
@app.get("/providers")
async def list_providers() -> dict[str, object]:
return {
"providers": [
{
"key": "flow",
"display_name": "Google Flow",
"route_prefix": FLOW_ROUTE_PREFIX,
"legacy_aliases": True,
"management_url": f"{FLOW_ROUTE_PREFIX}/ui",
},
{
"key": "doubao",
"display_name": "Doubao",
"route_prefix": DOUBAO_ROUTE_PREFIX,
"legacy_aliases": False,
"management_url": f"{DOUBAO_ROUTE_PREFIX}/ui",
},
{
"key": "dyks",
"display_name": "Dyks",
"route_prefix": DYKS_ROUTE_PREFIX,
"legacy_aliases": True,
"management_url": f"{DYKS_ROUTE_PREFIX}/ui",
},
]
}