feat: Implement gRPC Reflection Service (#340)

Co-authored-by: Samani G. Gikandi <[email protected]>

examples/src/reflection/server.rs

@@ -0,0 +1,46 @@
+use tonic::transport::Server;
+use tonic::{Request, Response, Status};
+
+mod proto {
+    tonic::include_proto!("helloworld");
+
+    pub(crate) const FILE_DESCRIPTOR_SET: &'static [u8] =
+        tonic::include_file_descriptor_set!("helloworld_descriptor");
+}
+
+#[derive(Default)]
+pub struct MyGreeter {}
+
+#[tonic::async_trait]
+impl proto::greeter_server::Greeter for MyGreeter {
+    async fn say_hello(
+        &self,
+        request: Request<proto::HelloRequest>,
+    ) -> Result<Response<proto::HelloReply>, Status> {
+        println!("Got a request from {:?}", request.remote_addr());
+
+        let reply = proto::HelloReply {
+            message: format!("Hello {}!", request.into_inner().name),
+        };
+        Ok(Response::new(reply))
+    }
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let service = tonic_reflection::server::Builder::configure()
+        .register_encoded_file_descriptor_set(proto::FILE_DESCRIPTOR_SET)
+        .build()
+        .unwrap();
+
+    let addr = "[::1]:50052".parse().unwrap();
+    let greeter = MyGreeter::default();
+
+    Server::builder()
+        .add_service(service)
+        .add_service(proto::greeter_server::GreeterServer::new(greeter))
+        .serve(addr)
+        .await?;
+
+    Ok(())
+}