2026-04-29-21-51-19 - 全栈系统改造：FastAPI后端+SAM2+PostgreSQL+Redis+MinIO+前端Zustand重构

backend/main.py

@@ -0,0 +1,83 @@
+"""FastAPI application entrypoint."""
+
+import logging
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from config import settings
+from database import Base, engine
+from minio_client import ensure_bucket_exists
+from redis_client import ping as redis_ping
+
+from routers import projects, templates, media, ai, export, auth
+
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s | %(levelname)s | %(name)s | %(message)s",
+)
+logger = logging.getLogger(__name__)
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    """Application lifespan: startup and shutdown hooks."""
+    # Startup
+    logger.info("Starting up SegServer backend...")
+
+    # Initialize database tables
+    try:
+        Base.metadata.create_all(bind=engine)
+        logger.info("Database tables initialized.")
+    except Exception as exc:  # noqa: BLE001
+        logger.error("Database initialization failed: %s", exc)
+
+    # Check MinIO bucket
+    try:
+        ensure_bucket_exists()
+    except Exception as exc:  # noqa: BLE001
+        logger.error("MinIO bucket check failed: %s", exc)
+
+    # Check Redis
+    if redis_ping():
+        logger.info("Redis connection OK.")
+    else:
+        logger.warning("Redis connection failed.")
+
+    yield
+
+    # Shutdown
+    logger.info("Shutting down SegServer backend...")
+    engine.dispose()
+
+
+app = FastAPI(
+    title="SegServer API",
+    description="Semantic Segmentation System Backend",
+    version="1.0.0",
+    lifespan=lifespan,
+)
+
+# CORS
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=settings.cors_origins,
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Routers
+app.include_router(auth.router)
+app.include_router(projects.router)
+app.include_router(templates.router)
+app.include_router(media.router)
+app.include_router(ai.router)
+app.include_router(export.router)
+
+
+@app.get("/health", tags=["Health"])
+def health_check() -> dict:
+    """Health check endpoint."""
+    return {"status": "ok", "service": "SegServer"}