feat: 添加PAYMENT_MAINTENANCE_MODE维护模式 + ServiceUnavailable错误

src/error.rs

@@ -53,6 +53,7 @@ pub enum AppError {
     Internal(String),
     Database(String),
     TooManyRequests(String),
+    ServiceUnavailable(String),
 }
 
 impl fmt::Display for AppError {
@@ -65,6 +66,7 @@ impl fmt::Display for AppError {
             AppError::Internal(msg) => write!(f, "{}", msg),
             AppError::Database(msg) => write!(f, "{}", msg),
             AppError::TooManyRequests(msg) => write!(f, "{}", msg),
+            AppError::ServiceUnavailable(msg) => write!(f, "{}", msg),
         }
     }
 }
@@ -78,6 +80,7 @@ impl ResponseError for AppError {
             AppError::BadRequest(_) => StatusCode::BAD_REQUEST,
             AppError::Internal(_) | AppError::Database(_) => StatusCode::INTERNAL_SERVER_ERROR,
             AppError::TooManyRequests(_) => StatusCode::TOO_MANY_REQUESTS,
+            AppError::ServiceUnavailable(_) => StatusCode::SERVICE_UNAVAILABLE,
         }
     }
 
@@ -169,6 +172,7 @@ impl ResponseError for AppError {
                 AppError::BadRequest(_) => "请求无效",
                 AppError::Internal(_) | AppError::Database(_) => "服务器错误",
                 AppError::TooManyRequests(_) => "请求过于频繁",
+                AppError::ServiceUnavailable(_) => "服务暂不可用",
             }
         );