140 lines
4.2 KiB
Python
140 lines
4.2 KiB
Python
"""FastAPI application entrypoint."""
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import logging
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from contextlib import asynccontextmanager
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from fastapi import FastAPI, WebSocket, WebSocketDisconnect
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from fastapi.middleware.cors import CORSMiddleware
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from config import settings
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from database import Base, engine
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from minio_client import ensure_bucket_exists
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from redis_client import ping as redis_ping
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from routers import projects, templates, media, ai, export, auth
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logging.basicConfig(
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level=logging.INFO,
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format="%(asctime)s | %(levelname)s | %(name)s | %(message)s",
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)
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logger = logging.getLogger(__name__)
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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"""Application lifespan: startup and shutdown hooks."""
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# Startup
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logger.info("Starting up SegServer backend...")
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# Initialize database tables
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try:
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Base.metadata.create_all(bind=engine)
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logger.info("Database tables initialized.")
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except Exception as exc: # noqa: BLE001
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logger.error("Database initialization failed: %s", exc)
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# Check MinIO bucket
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try:
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ensure_bucket_exists()
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except Exception as exc: # noqa: BLE001
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logger.error("MinIO bucket check failed: %s", exc)
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# Check Redis
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if redis_ping():
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logger.info("Redis connection OK.")
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else:
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logger.warning("Redis connection failed.")
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yield
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# Shutdown
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logger.info("Shutting down SegServer backend...")
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engine.dispose()
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app = FastAPI(
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title="SegServer API",
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description="Semantic Segmentation System Backend",
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version="1.0.0",
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lifespan=lifespan,
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)
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# CORS
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app.add_middleware(
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CORSMiddleware,
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allow_origins=settings.cors_origins,
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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# Routers
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app.include_router(auth.router)
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app.include_router(projects.router)
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app.include_router(templates.router)
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app.include_router(media.router)
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app.include_router(ai.router)
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app.include_router(export.router)
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@app.get("/health", tags=["Health"])
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def health_check() -> dict:
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"""Health check endpoint."""
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return {"status": "ok", "service": "SegServer"}
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# ---------------------------------------------------------------------------
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# WebSocket: 实时进度推送
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# ---------------------------------------------------------------------------
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class ConnectionManager:
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"""Manage WebSocket connections for progress broadcasting."""
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def __init__(self):
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self.active_connections: list[WebSocket] = []
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async def connect(self, websocket: WebSocket):
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await websocket.accept()
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self.active_connections.append(websocket)
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logger.info("WebSocket client connected. Total: %d", len(self.active_connections))
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def disconnect(self, websocket: WebSocket):
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if websocket in self.active_connections:
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self.active_connections.remove(websocket)
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logger.info("WebSocket client disconnected. Total: %d", len(self.active_connections))
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async def broadcast(self, message: dict):
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"""Broadcast a message to all connected clients."""
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for connection in self.active_connections.copy():
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try:
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await connection.send_json(message)
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except Exception as exc:
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logger.warning("WebSocket send failed: %s", exc)
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self.disconnect(connection)
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manager = ConnectionManager()
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@app.websocket("/ws/progress")
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async def websocket_progress(websocket: WebSocket):
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"""WebSocket endpoint for real-time parsing/AI progress updates."""
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await manager.connect(websocket)
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try:
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while True:
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# Receive client messages (heartbeat / subscription requests)
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data = await websocket.receive_text()
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logger.debug("WebSocket received: %s", data)
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# Echo heartbeat to keep connection alive
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await websocket.send_json({
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"type": "status",
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"status": "connected",
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"message": "Progress stream active",
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"timestamp": str(logging.time.time() if hasattr(logging, 'time') else __import__('time').time()),
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})
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except WebSocketDisconnect:
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manager.disconnect(websocket)
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except Exception as exc:
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logger.error("WebSocket error: %s", exc)
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manager.disconnect(websocket)
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