Updates

reference_jsonrpsee_crate_examples/proc_macro_bounds.rs

@@ -0,0 +1,95 @@
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
+//
+// Permission is hereby granted, free of charge, to any
+// person obtaining a copy of this software and associated
+// documentation files (the "Software"), to deal in the
+// Software without restriction, including without
+// limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software
+// is furnished to do so, subject to the following
+// conditions:
+//
+// The above copyright notice and this permission notice
+// shall be included in all copies or substantial portions
+// of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+// IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+use std::net::SocketAddr;
+
+use jsonrpsee::core::async_trait;
+use jsonrpsee::proc_macros::rpc;
+use jsonrpsee::server::Server;
+use jsonrpsee::types::ErrorObjectOwned;
+use jsonrpsee::ws_client::WsClientBuilder;
+type ExampleHash = [u8; 32];
+
+pub trait Config {
+	type Hash: Send + Sync + 'static;
+}
+
+impl Config for ExampleHash {
+	type Hash = Self;
+}
+
+/// The RPC macro requires `DeserializeOwned` for output types for the client implementation, while the
+/// server implementation requires output types to be bounded by `Serialize`.
+///
+/// In this example, we don't want the `Conf` to be bounded by default to
+/// `Conf : Send + Sync + 'static + jsonrpsee::core::DeserializeOwned` for client implementation and
+/// `Conf : Send + Sync + 'static + jsonrpsee::core::Serialize` for server implementation.
+///
+/// Explicitly, specify client and server bounds to handle the `Serialize` and `DeserializeOwned` cases
+/// just for the `Conf::hash` part.
+#[rpc(server, client, namespace = "foo", client_bounds(T::Hash: jsonrpsee::core::DeserializeOwned), server_bounds(T::Hash: jsonrpsee::core::Serialize + Clone))]
+pub trait Rpc<T: Config> {
+	#[method(name = "bar")]
+	fn method(&self) -> Result<T::Hash, ErrorObjectOwned>;
+}
+
+pub struct RpcServerImpl;
+
+#[async_trait]
+impl RpcServer<ExampleHash> for RpcServerImpl {
+	fn method(&self) -> Result<<ExampleHash as Config>::Hash, ErrorObjectOwned> {
+		Ok([0u8; 32])
+	}
+}
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+	tracing_subscriber::FmtSubscriber::builder()
+		.with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
+		.try_init()
+		.expect("setting default subscriber failed");
+
+	let server_addr = run_server().await?;
+	let url = format!("ws://{}", server_addr);
+
+	let client = WsClientBuilder::default().build(&url).await?;
+	assert_eq!(RpcClient::<ExampleHash>::method(&client).await.unwrap(), [0u8; 32]);
+
+	Ok(())
+}
+
+async fn run_server() -> anyhow::Result<SocketAddr> {
+	let server = Server::builder().build("127.0.0.1:0").await?;
+
+	let addr = server.local_addr()?;
+	let handle = server.start(RpcServerImpl.into_rpc());
+
+	// In this example we don't care about doing shutdown so let's it run forever.
+	// You may use the `ServerHandle` to shut it down or manage it yourself.
+	tokio::spawn(handle.stopped());
+
+	Ok(addr)
+}