Move to std::futures to support async/await.

examples/test-device/src/main.rs

@@ -1,20 +1,20 @@
-use futures::prelude::*;
 use yup_oauth2::{self, Authenticator, DeviceFlow, GetToken};
 
 use std::path;
 use tokio;
 
-fn main() {
+#[tokio::main]
+async fn main() {
     let creds = yup_oauth2::read_application_secret(path::Path::new("clientsecret.json"))
         .expect("clientsecret");
-    let mut auth = Authenticator::new(DeviceFlow::new(creds))
+    let auth = Authenticator::new(DeviceFlow::new(creds))
         .persist_tokens_to_disk("tokenstorage.json")
         .build()
         .expect("authenticator");
 
     let scopes = vec!["https://www.googleapis.com/auth/youtube.readonly"];
-    let mut rt = tokio::runtime::Runtime::new().unwrap();
-    let fut = auth.token(scopes).and_then(|tok| Ok(println!("{:?}", tok)));
-
-    println!("{:?}", rt.block_on(fut));
+    match auth.token(scopes).await {
+        Err(e) => println!("error: {:?}", e),
+        Ok(t) => println!("token: {:?}", t),
+    }
 }