vendor/jsonrpc-derive/examples/generic-trait.rs

use jsonrpc_core;

use jsonrpc_core::{BoxFuture, IoHandler, Result};
use jsonrpc_derive::rpc;

#[rpc]
pub trait Rpc<One, Two> {
	/// Get One type.
	#[rpc(name = "getOne")]
	fn one(&self) -> Result<One>;

	/// Adds two numbers and returns a result
	#[rpc(name = "setTwo")]
	fn set_two(&self, a: Two) -> Result<()>;

	/// Performs asynchronous operation
	#[rpc(name = "beFancy")]
	fn call(&self, a: One) -> BoxFuture<Result<(One, Two)>>;
}

struct RpcImpl;

impl Rpc<u64, String> for RpcImpl {
	fn one(&self) -> Result<u64> {
		Ok(100)
	}

	fn set_two(&self, x: String) -> Result<()> {
		println!("{}", x);
		Ok(())
	}

	fn call(&self, num: u64) -> BoxFuture<Result<(u64, String)>> {
		Box::pin(jsonrpc_core::futures::future::ready(Ok((num + 999, "hello".into()))))
	}
}

fn main() {
	let mut io = IoHandler::new();
	let rpc = RpcImpl;

	io.extend_with(rpc.to_delegate())
}