http.rs

// 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 jsonrpsee::{
	http_client::HttpClientBuilder,
	http_server::{HttpServerBuilder, HttpServerHandle, RpcModule},
	rpc_params,
	types::traits::Client,
};
use std::net::SocketAddr;

#[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, _handle) = run_server().await?;
	let url = format!("http://{}", server_addr);

	let client = HttpClientBuilder::default().build(url)?;
	let params = rpc_params!(1_u64, 2, 3);
	let response: Result<String, _> = client.request("say_hello", params).await;
	tracing::info!("r: {:?}", response);

	Ok(())
}

async fn run_server() -> anyhow::Result<(SocketAddr, HttpServerHandle)> {
	let server = HttpServerBuilder::default().build("127.0.0.1:0".parse::<SocketAddr>()?)?;
	let mut module = RpcModule::new(());
	module.register_method("say_hello", |_, _| Ok("lo"))?;

	let addr = server.local_addr()?;
	let server_handle = server.start(module)?;
	Ok((addr, server_handle))
}