chore(docs): Add hyper example (#267)

Signed-off-by: Lucio Franco <luciofranco14@gmail.com>

examples/Cargo.toml

@@ -94,6 +94,14 @@ path = "src/interceptor/client.rs"
 name = "interceptor-server"
 path = "src/interceptor/server.rs"
 
+[[bin]]
+name = "hyper-client"
+path = "src/hyper/client.rs"
+
+[[bin]]
+name = "hyper-server"
+path = "src/hyper/server.rs"
+
 [dependencies]
 tonic = { path = "../tonic", features = ["tls"] }
 prost = "0.6"
@@ -112,6 +120,8 @@ tracing-attributes = "0.1"
 tracing-futures = "0.2"
 # Required for wellknown types
 prost-types = "0.6"
+# Hyper example
+hyper = "0.13"
 
 [build-dependencies]
 tonic-build = { path = "../tonic-build" }

examples/src/hyper/client.rs

@@ -0,0 +1,42 @@
+use hello_world::greeter_client::GreeterClient;
+use hello_world::HelloRequest;
+use hyper::{Client, Uri};
+
+pub mod hello_world {
+    tonic::include_proto!("helloworld");
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let client = Client::builder().http2_only(true).build_http();
+
+    let uri = Uri::from_static("http://[::1]:50051");
+
+    // Hyper's client requires that requests contain full Uris include a scheme and
+    // an authority. Tonic's transport will handle this for you but when using the client
+    // manually you need ensure the uri's are set correctly.
+    let add_origin = tower::service_fn(|mut req: hyper::Request<tonic::body::BoxBody>| {
+        let uri = Uri::builder()
+            .scheme(uri.scheme().unwrap().clone())
+            .authority(uri.authority().unwrap().clone())
+            .path_and_query(req.uri().path_and_query().unwrap().clone())
+            .build()
+            .unwrap();
+
+        *req.uri_mut() = uri;
+
+        client.request(req)
+    });
+
+    let mut client = GreeterClient::new(add_origin);
+
+    let request = tonic::Request::new(HelloRequest {
+        name: "Tonic".into(),
+    });
+
+    let response = client.say_hello(request).await?;
+
+    println!("RESPONSE={:?}", response);
+
+    Ok(())
+}

examples/src/hyper/server.rs

@@ -0,0 +1,46 @@
+use futures::future;
+use hyper::{service::make_service_fn, Server};
+use std::convert::Infallible;
+use tonic::{Request, Response, Status};
+
+use hello_world::greeter_server::{Greeter, GreeterServer};
+use hello_world::{HelloReply, HelloRequest};
+
+pub mod hello_world {
+    tonic::include_proto!("helloworld");
+}
+
+#[derive(Default)]
+pub struct MyGreeter {}
+
+#[tonic::async_trait]
+impl Greeter for MyGreeter {
+    async fn say_hello(
+        &self,
+        request: Request<HelloRequest>,
+    ) -> Result<Response<HelloReply>, Status> {
+        let reply = hello_world::HelloReply {
+            message: format!("Hello {}!", request.into_inner().name),
+        };
+        Ok(Response::new(reply))
+    }
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let addr = "[::1]:50051".parse().unwrap();
+    let greeter = MyGreeter::default();
+
+    println!("GreeterServer listening on {}", addr);
+
+    let svc = GreeterServer::new(greeter);
+
+    Server::bind(&addr)
+        .http2_only(true)
+        .serve(make_service_fn(|_| {
+            future::ok::<_, Infallible>(svc.clone())
+        }))
+        .await?;
+
+    Ok(())
+}