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// 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.
rpc_params,
types::{traits::SubscriptionClient, Error, Subscription},
const NUM_SUBSCRIPTION_RESPONSES: usize = 5;
async fn main() -> anyhow::Result<()> {
// init tracing `FmtSubscriber`.
let subscriber = tracing_subscriber::FmtSubscriber::builder().finish();
tracing::subscriber::set_global_default(subscriber).expect("setting default subscriber failed");
let addr = run_server().await?;
let url = format!("ws://{}", addr);
let client = WsClientBuilder::default().build(&url).await?;
let mut subscribe_hello: Subscription<String> =
client.subscribe("subscribe_hello", rpc_params![], "unsubscribe_hello").await?;
let mut i = 0;
while i <= NUM_SUBSCRIPTION_RESPONSES {
let r = subscribe_hello.next().await;
tracing::info!("received {:?}", r);
async fn run_server() -> anyhow::Result<SocketAddr> {
let server = WsServerBuilder::default().build("127.0.0.1:0").await?;
module.register_subscription("subscribe_hello", "unsubscribe_hello", |_, mut sink, _| {
std::thread::spawn(move || loop {
if let Err(Error::SubscriptionClosed(_)) = sink.send(&"hello my friend") {
return;
}
std::thread::sleep(std::time::Duration::from_secs(1));
});
Ok(())
})?;