chore: Add blocknig server example (#277)

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

examples/helloworld-tutorial.md

@@ -129,7 +129,7 @@ At the root of your crate, create a `build.rs` file and add the following code:
 
 ```rust
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    tonic_build::prost::compile_protos("proto/helloworld.proto")?;
+    tonic_build::compile_protos("proto/helloworld.proto")?;
     Ok(())
 }
 ```

examples/routeguide-tutorial.md

@@ -199,7 +199,7 @@ Create a `build.rs` file at the root of your crate:
 
 ```rust
 fn main() {
-    tonic_build::prost::compile_protos("proto/route_guide.proto")
+    tonic_build::compile_protos("proto/route_guide.proto")
         .unwrap_or_else(|e| panic!("Failed to compile protos {:?}", e));
 }
 ```

examples/src/helloworld/server_blocking.rs

@@ -0,0 +1,40 @@
+use tonic::{transport::Server, Request, Response, Status};
+
+use hello_world::greeter_server::{Greeter, GreeterServer};
+use hello_world::{HelloReply, HelloRequest};
+
+use tokio::runtime::Runtime;
+
+pub mod hello_world {
+    tonic::include_proto!("helloworld");
+}
+
+#[derive(Debug, Default)]
+pub struct MyGreeter {}
+
+#[tonic::async_trait]
+impl Greeter for MyGreeter {
+    async fn say_hello(
+        &self,
+        request: Request<HelloRequest>,
+    ) -> Result<Response<HelloReply>, Status> {
+        println!("Got a request: {:?}", request);
+
+        let reply = hello_world::HelloReply {
+            message: format!("Hello {}!", request.into_inner().name).into(),
+        };
+
+        Ok(Response::new(reply))
+    }
+}
+
+fn main() {
+    let addr = "[::1]:50051".parse().unwrap();
+    let greeter = MyGreeter::default();
+
+    let mut rt = Runtime::new().expect("failed to obtain a new RunTime object");
+    let server_future = Server::builder()
+                        .add_service(GreeterServer::new(greeter))
+                        .serve(addr);
+    rt.block_on(server_future).expect("failed to successfully run the future on RunTime");
+}