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// Copyright 2019 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::{
ws_client::{traits::SubscriptionClient, v2::params::JsonRpcParams, WsClientBuilder},
};
use std::net::SocketAddr;
#[tokio::main]
async fn main() -> anyhow::Result<()> {
env_logger::init();
let addr = run_server().await?;
let url = format!("ws://{}", addr);
let client = WsClientBuilder::default().build(&url).await?;
// Subscription with a single parameter
let params = JsonRpcParams::Array(vec![3.into()]);
let mut sub_params_one = client.subscribe::<Option<char>>("sub_one_param", params, "unsub_one_param").await?;
println!("subscription with one param: {:?}", sub_params_one.next().await);
// Subscription with multiple parameters
let params = JsonRpcParams::Array(vec![2.into(), 5.into()]);
let mut sub_params_two = client.subscribe::<String>("sub_params_two", params, "unsub_params_two").await?;
println!("subscription with two params: {:?}", sub_params_two.next().await);
Ok(())
}
async fn run_server() -> anyhow::Result<SocketAddr> {
const LETTERS: &str = "abcdefghijklmnopqrstuvxyz";
let mut server = WsServerBuilder::default().build("127.0.0.1:0").await?;
let mut module = RpcModule::new(());
module
.register_subscription("sub_one_param", "unsub_one_param", |params, sink, _| {
let idx: usize = params.one()?;
std::thread::spawn(move || loop {
let _ = sink.send(&LETTERS.chars().nth(idx));
std::thread::sleep(std::time::Duration::from_millis(50));
});
Ok(())
})
.unwrap();
module
.register_subscription("sub_params_two", "unsub_params_two", |params, sink, _| {
let (one, two): (usize, usize) = params.parse()?;
std::thread::spawn(move || loop {
let _ = sink.send(&LETTERS[one..two].to_string());
std::thread::sleep(std::time::Duration::from_millis(100));
});
Ok(())
})
.unwrap();
let addr = server.local_addr()?;
tokio::spawn(async move { server.start().await });
Ok(addr)
}