re-structure code

app/dependencies/database.py

@@ -0,0 +1,34 @@
+from __future__ import annotations
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+try:
+    import redis
+except ImportError:
+    redis = None
+from app.config import settings
+
+# 数据库引擎
+engine = create_engine(settings.DATABASE_URL)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# Redis 连接
+if redis:
+    redis_client = redis.from_url(settings.REDIS_URL, decode_responses=True)
+else:
+    redis_client = None
+
+
+# 数据库依赖
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+# Redis 依赖
+def get_redis():
+    return redis_client