Upgrade to Tokio 1.0.0 ecosystem (#530)

* Upgrade Tonic to Tokio 1.0

Work in progress for updating Tonic to Tokio 1.0. Since tower has not
been released to crates.io, a git dependency is taken instead.

* Upgrade Tonic to Tokio 1.0 phase 2

* tonic: remove tower-* deps

* Apply suggestions from code review

Co-authored-by: Ed Marshall <[email protected]>
Co-authored-by: Lucio Franco <[email protected]>

tests/integration_tests/tests/connection.rs

@@ -41,14 +41,14 @@ async fn connect_returns_err_via_call_after_connected() {
             .unwrap();
     });
 
-    tokio::time::delay_for(Duration::from_millis(100)).await;
+    tokio::time::sleep(Duration::from_millis(100)).await;
 
     let mut client = TestClient::connect("http://127.0.0.1:1338").await.unwrap();
 
     // First call should pass, then shutdown the server
     client.unary_call(Request::new(Input {})).await.unwrap();
 
-    tokio::time::delay_for(Duration::from_millis(100)).await;
+    tokio::time::sleep(Duration::from_millis(100)).await;
 
     let res = client.unary_call(Request::new(Input {})).await;
 
@@ -81,11 +81,11 @@ async fn connect_lazy_reconnects_after_first_failure() {
             .unwrap();
     });
 
-    tokio::time::delay_for(Duration::from_millis(100)).await;
+    tokio::time::sleep(Duration::from_millis(100)).await;
     client.unary_call(Request::new(Input {})).await.unwrap();
 
     // The server shut down, third call should fail
-    tokio::time::delay_for(Duration::from_millis(100)).await;
+    tokio::time::sleep(Duration::from_millis(100)).await;
     client.unary_call(Request::new(Input {})).await.unwrap_err();
 
     jh.await.unwrap();

tests/integration_tests/tests/status.rs

@@ -33,7 +33,7 @@ async fn status_with_details() {
             .unwrap();
     });
 
-    tokio::time::delay_for(Duration::from_millis(100)).await;
+    tokio::time::sleep(Duration::from_millis(100)).await;
 
     let mut channel = test_client::TestClient::connect("http://127.0.0.1:1337")
         .await
@@ -87,7 +87,7 @@ async fn status_with_metadata() {
             .unwrap();
     });
 
-    tokio::time::delay_for(Duration::from_millis(100)).await;
+    tokio::time::sleep(Duration::from_millis(100)).await;
 
     let mut channel = test_client::TestClient::connect("http://127.0.0.1:1338")
         .await

tests/integration_tests/tests/user_agent.rs

@@ -33,7 +33,7 @@ async fn writes_user_agent_header() {
             .unwrap();
     });
 
-    tokio::time::delay_for(Duration::from_millis(100)).await;
+    tokio::time::sleep(Duration::from_millis(100)).await;
 
     let channel = Endpoint::from_static("http://127.0.0.1:1322")
         .user_agent("my-client")