Hello World gRPC call

rust-lightclient/src/main.rs

@@ -0,0 +1,48 @@
+
+use futures::Future;
+use hyper::client::connect::{Destination, HttpConnector};
+use tower_grpc::Request;
+use tower_hyper::{client, util};
+use tower_util::MakeService;
+
+pub mod grpc_client {
+    include!(concat!(env!("OUT_DIR"), "/cash.z.wallet.sdk.rpc.rs"));
+}
+
+pub fn main() {
+    let uri: http::Uri = format!("http://127.0.0.1:9067").parse().unwrap();
+
+    let dst = Destination::try_from_uri(uri.clone()).unwrap();
+    let connector = util::Connector::new(HttpConnector::new(4));
+    let settings = client::Builder::new().http2_only(true).clone();
+    let mut make_client = client::Connect::with_builder(connector, settings);
+
+    let say_hello = make_client
+        .make_service(dst)
+        .map_err(|e| panic!("connect error: {:?}", e))
+        .and_then(move |conn| {
+            use crate::grpc_client::client::CompactTxStreamer;
+
+            let conn = tower_request_modifier::Builder::new()
+                .set_origin(uri)
+                .build(conn)
+                .unwrap();
+
+            // Wait until the client is ready...
+            CompactTxStreamer::new(conn).ready()
+        })
+        .and_then(|mut client| {
+            use crate::grpc_client::ChainSpec;
+
+            client.get_latest_block(Request::new(ChainSpec {}))
+        })
+        .and_then(|response| {
+            println!("RESPONSE = {:?}", response);
+            Ok(())
+        })
+        .map_err(|e| {
+            println!("ERR = {:?}", e);
+        });
+
+    tokio::run(say_hello);
+}