Upgrade to tokio 0.3 (#1839)

## Description

This PR updates Lighthouse to tokio 0.3. It includes a number of dependency updates and some structural changes as to how we create and spawn tasks.

This also brings with it a number of various improvements:

- Discv5 update
- Libp2p update
- Fix for recompilation issues
- Improved UPnP port mapping handling
- Futures dependency update
- Log downgrade to traces for rejecting peers when we've reached our max



Co-authored-by: blacktemplar <blacktemplar@a1.net>

beacon_node/http_metrics/Cargo.toml

@@ -8,7 +8,7 @@ edition = "2018"
 
 [dependencies]
 prometheus = "0.10.0"
-warp = { git = "https://github.com/paulhauner/warp", branch = "cors-wildcard" }
+warp = { git = "https://github.com/sigp/warp ", branch = "lighthouse" }
 serde = { version = "1.0.116", features = ["derive"] }
 slog = "2.5.2"
 beacon_chain = { path = "../beacon_chain" }
@@ -22,7 +22,8 @@ lighthouse_version = { path = "../../common/lighthouse_version" }
 warp_utils = { path = "../../common/warp_utils" }
 
 [dev-dependencies]
-tokio = { version = "0.2.22", features = ["sync"] }
+tokio = { version = "0.3.2", features = ["sync"] }
 reqwest = { version = "0.10.8", features = ["json"] }
 environment = { path = "../../lighthouse/environment" }
 types = { path = "../../consensus/types" }
+tokio-compat-02 = "0.1"

beacon_node/http_metrics/tests/tests.rs

@@ -5,42 +5,47 @@ use reqwest::StatusCode;
 use std::net::Ipv4Addr;
 use std::sync::Arc;
 use tokio::sync::oneshot;
+use tokio_compat_02::FutureExt;
 use types::MainnetEthSpec;
 
 type Context = http_metrics::Context<EphemeralHarnessType<MainnetEthSpec>>;
 
-#[tokio::test(core_threads = 2)]
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn returns_200_ok() {
-    let log = null_logger().unwrap();
+    async {
+        let log = null_logger().unwrap();
 
-    let context = Arc::new(Context {
-        config: Config {
-            enabled: true,
-            listen_addr: Ipv4Addr::new(127, 0, 0, 1),
-            listen_port: 0,
-            allow_origin: None,
-        },
-        chain: None,
-        db_path: None,
-        freezer_db_path: None,
-        log,
-    });
+        let context = Arc::new(Context {
+            config: Config {
+                enabled: true,
+                listen_addr: Ipv4Addr::new(127, 0, 0, 1),
+                listen_port: 0,
+                allow_origin: None,
+            },
+            chain: None,
+            db_path: None,
+            freezer_db_path: None,
+            log,
+        });
 
-    let ctx = context.clone();
-    let (_shutdown_tx, shutdown_rx) = oneshot::channel::<()>();
-    let server_shutdown = async {
-        // It's not really interesting why this triggered, just that it happened.
-        let _ = shutdown_rx.await;
-    };
-    let (listening_socket, server) = http_metrics::serve(ctx, server_shutdown).unwrap();
+        let ctx = context.clone();
+        let (_shutdown_tx, shutdown_rx) = oneshot::channel::<()>();
+        let server_shutdown = async {
+            // It's not really interesting why this triggered, just that it happened.
+            let _ = shutdown_rx.await;
+        };
+        let (listening_socket, server) = http_metrics::serve(ctx, server_shutdown).unwrap();
 
-    tokio::spawn(async { server.await });
+        tokio::spawn(async { server.await });
 
-    let url = format!(
-        "http://{}:{}/metrics",
-        listening_socket.ip(),
-        listening_socket.port()
-    );
+        let url = format!(
+            "http://{}:{}/metrics",
+            listening_socket.ip(),
+            listening_socket.port()
+        );
 
-    assert_eq!(reqwest::get(&url).await.unwrap().status(), StatusCode::OK);
+        assert_eq!(reqwest::get(&url).await.unwrap().status(), StatusCode::OK);
+    }
+    .compat()
+    .await
 }