139 lines
4.8 KiB
Rust
139 lines
4.8 KiB
Rust
// Copyright 2019-2021 Parity Technologies (UK) Ltd.
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//
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// Permission is hereby granted, free of charge, to any
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// person obtaining a copy of this software and associated
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// documentation files (the "Software"), to deal in the
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// Software without restriction, including without
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// limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software
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// is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice
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// shall be included in all copies or substantial portions
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// of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
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// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
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// IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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use std::net::SocketAddr;
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use std::time::Duration;
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use futures::{Stream, StreamExt};
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use jsonrpsee::core::Serialize;
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use jsonrpsee::core::client::{Subscription, SubscriptionClientT};
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use jsonrpsee::server::{RpcModule, Server, ServerConfig, TrySendError};
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use jsonrpsee::ws_client::WsClientBuilder;
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use jsonrpsee::{PendingSubscriptionSink, rpc_params};
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use tokio::time::interval;
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use tokio_stream::wrappers::IntervalStream;
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#[tokio::main]
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async fn main() -> anyhow::Result<()> {
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tracing_subscriber::FmtSubscriber::builder()
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.with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
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.try_init()
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.expect("setting default subscriber failed");
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let addr = run_server().await?;
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let url = format!("ws://{}", addr);
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let client = WsClientBuilder::default().build(&url).await?;
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// Subscription with a single parameter
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let mut sub_params_one: Subscription<Option<char>> =
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client.subscribe("sub_one_param", rpc_params![3], "unsub_one_param").await?;
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tracing::info!("subscription with one param: {:?}", sub_params_one.next().await);
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// Subscription with multiple parameters
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let mut sub_params_two: Subscription<String> =
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client.subscribe("sub_params_two", rpc_params![2, 5], "unsub_params_two").await?;
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tracing::info!("subscription with two params: {:?}", sub_params_two.next().await);
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Ok(())
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}
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async fn run_server() -> anyhow::Result<SocketAddr> {
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const LETTERS: &str = "abcdefghijklmnopqrstuvxyz";
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let config = ServerConfig::builder().set_message_buffer_capacity(10).build();
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let server = Server::builder().set_config(config).build("127.0.0.1:0").await?;
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let mut module = RpcModule::new(());
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module
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.register_subscription(
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"sub_one_param",
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"sub_one_param",
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"unsub_one_param",
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|params, pending, _, _| async move {
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// we are doing this verbose way to get a customized reject error on the subscription.
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let idx = match params.one::<usize>() {
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Ok(p) => p,
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Err(e) => {
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let _ = pending.reject(e).await;
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return Ok(());
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}
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};
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let item = LETTERS.chars().nth(idx);
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let interval = interval(Duration::from_millis(200));
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let stream = IntervalStream::new(interval).map(move |_| item);
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pipe_from_stream_and_drop(pending, stream).await.map_err(Into::into)
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},
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)
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.unwrap();
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module
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.register_subscription("sub_params_two", "params_two", "unsub_params_two", |params, pending, _, _| async move {
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let (one, two) = params.parse::<(usize, usize)>()?;
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let item = &LETTERS[one..two];
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let interval = interval(Duration::from_millis(200));
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let stream = IntervalStream::new(interval).map(move |_| item);
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pipe_from_stream_and_drop(pending, stream).await.map_err(Into::into)
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})
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.unwrap();
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let addr = server.local_addr()?;
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let handle = server.start(module);
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// In this example we don't care about doing shutdown so let's it run forever.
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// You may use the `ServerHandle` to shut it down or manage it yourself.
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tokio::spawn(handle.stopped());
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Ok(addr)
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}
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pub async fn pipe_from_stream_and_drop<T: Serialize>(
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pending: PendingSubscriptionSink,
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mut stream: impl Stream<Item = T> + Unpin,
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) -> Result<(), anyhow::Error> {
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let mut sink = pending.accept().await?;
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loop {
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tokio::select! {
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_ = sink.closed() => break Err(anyhow::anyhow!("Subscription was closed")),
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maybe_item = stream.next() => {
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let item = match maybe_item {
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Some(item) => item,
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None => break Err(anyhow::anyhow!("Subscription was closed")),
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};
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let msg = serde_json::value::to_raw_value(&item)?;
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match sink.try_send(msg) {
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Ok(_) => (),
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Err(TrySendError::Closed(_)) => break Err(anyhow::anyhow!("Subscription was closed")),
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// channel is full, let's be naive an just drop the message.
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Err(TrySendError::Full(_)) => (),
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}
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}
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}
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}
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}
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