deps: update to tokio 0.3

This uses a git dependency on Hyper for now.

Cargo.toml

@@ -9,3 +9,7 @@ members = [
   "metrics-tracing-context",
 ]
 exclude = ["metrics-observer"]
+
+[patch.crates-io]
+hyper = { git = "https://github.com/hyperium/hyper/", rev = "ed2b22a7f66899d338691552fbcb6c0f2f4e06b9" }
+

metrics-exporter-prometheus/Cargo.toml

@@ -27,8 +27,8 @@ parking_lot = "0.11"
 thiserror = "1.0"
 
 # Optional
-hyper = { version = "0.13", default-features = false, features = ["tcp"], optional = true }
-tokio = { version = "0.2", features = ["rt-core", "tcp", "time", "macros"], optional = true }
+hyper = { version = "0.14.0-dev", default-features = false, features = ["tcp", "server", "http1", "http2"], optional = true }
+tokio = { version = "0.3", features = ["rt", "net", "time", "macros"], optional = true }
 
 [dev-dependencies]
 quanta = "0.6"

metrics-exporter-prometheus/src/lib.rs

@@ -443,12 +443,14 @@ impl PrometheusBuilder {
     /// installing the recorder as the global recorder.
     #[cfg(feature = "tokio-exporter")]
     pub fn install(self) -> Result<(), Error> {
-        let mut runtime = runtime::Builder::new()
-            .basic_scheduler()
+        let runtime = runtime::Builder::new_current_thread()
             .enable_all()
             .build()?;
 
-        let (recorder, exporter) = runtime.enter(|| self.build_with_exporter())?;
+        let (recorder, exporter) = {
+            let _guard = runtime.enter();
+            self.build_with_exporter()
+        }?;
         metrics::set_boxed_recorder(Box::new(recorder))?;
 
         thread::Builder::new()