Add support of Unix socket

src/client/main.rs

@@ -1,13 +1,28 @@
-use hello_world::greeter_client::GreeterClient;
-use hello_world::HelloRequest;
+#![cfg_attr(not(unix), allow(unused_imports))]
 
 pub mod hello_world {
     tonic::include_proto!("helloworld");
 }
 
+use hello_world::{greeter_client::GreeterClient, HelloRequest};
+#[cfg(unix)]
+use tokio::net::UnixStream;
+use tonic::transport::{Endpoint, Uri};
+use tower::service_fn;
+
+#[cfg(unix)]
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let mut client = GreeterClient::connect("http://[::1]:50051").await?;
+    let channel = Endpoint::try_from("http://[::]:50051")?
+        .connect_with_connector(service_fn(|_: Uri| {
+            let path = "helloworld.sock";
+
+            // Connect to a Uds socket
+            UnixStream::connect(path)
+        }))
+        .await?;
+
+    let mut client = GreeterClient::new(channel);
 
     let request = tonic::Request::new(HelloRequest {
         name: "Tonic".into(),
@@ -18,4 +33,9 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     println!("RESPONSE={:?}", response);
 
     Ok(())
+}
+
+#[cfg(not(unix))]
+fn main() {
+    panic!("The `uds` example only works on unix systems!");
 }