--- a/rust/src/params.rs	Sat Jul 06 18:28:34 2019 +0800
+++ b/rust/src/params.rs	Thu Aug 22 23:59:50 2019 +0800
@@ -1,10 +1,3 @@
-extern crate tokio_core;
-extern crate futures_await as futures;
-extern crate rand;
-extern crate serde_json;
-extern crate base64;
-extern crate atomicwrites;
-
 use std::time::Duration;
 use std::io;
 use std::str;
@@ -14,19 +7,15 @@
 use std::cell::{Cell,RefCell};
 use std::fs::File;
 use std::io::Read;
-use futures::prelude::*;
 
 
-use tokio_core::reactor::Interval;
-use tokio_core::reactor::Handle;
-use futures::{Stream,Future,future};
-use self::rand::Rng;
+use rand::Rng;
 use std::str::FromStr;
 use hyper;
 use hyper::header::{Headers, ETag, EntityTag};
 use hyper::client::Client;
 
-use types::*;
+use crate::types::*;
 use ::Config;
 
 #[derive(Deserialize, Serialize, Debug, Clone)]