mirror of https://github.com/mastodon/flodgatt
104 lines
3.7 KiB
Rust
104 lines
3.7 KiB
Rust
use super::ClientAgent;
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use warp::ws::WebSocket;
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use futures::{future::Future, stream::Stream, Async};
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use log;
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use std::time::{Duration, Instant};
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pub struct EventStream;
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impl EventStream {
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/// Send a stream of replies to a WebSocket client.
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pub fn to_ws(
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socket: WebSocket,
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mut client_agent: ClientAgent,
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update_interval: Duration,
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) -> impl Future<Item = (), Error = ()> {
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let (ws_tx, mut ws_rx) = socket.split();
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let timeline = client_agent.subscription.timeline;
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// Create a pipe
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let (tx, rx) = futures::sync::mpsc::unbounded();
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// Send one end of it to a different thread and tell that end to forward whatever it gets
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// on to the websocket client
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warp::spawn(
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rx.map_err(|()| -> warp::Error { unreachable!() })
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.forward(ws_tx)
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.map(|_r| ())
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.map_err(|e| match e.to_string().as_ref() {
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"IO error: Broken pipe (os error 32)" => (), // just closed unix socket
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_ => log::warn!("websocket send error: {}", e),
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}),
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);
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// Yield new events for as long as the client is still connected
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let event_stream = tokio::timer::Interval::new(Instant::now(), update_interval).take_while(
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move |_| match ws_rx.poll() {
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Ok(Async::NotReady) | Ok(Async::Ready(Some(_))) => futures::future::ok(true),
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Ok(Async::Ready(None)) => {
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// TODO: consider whether we should manually drop closed connections here
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log::info!("Client closed WebSocket connection for {:?}", timeline);
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futures::future::ok(false)
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}
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Err(e) if e.to_string() == "IO error: Broken pipe (os error 32)" => {
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// no err, just closed Unix socket
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log::info!("Client closed WebSocket connection for {:?}", timeline);
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futures::future::ok(false)
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}
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Err(e) => {
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log::warn!("Error in {:?}: {}", timeline, e);
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futures::future::ok(false)
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}
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},
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);
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let mut time = Instant::now();
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// Every time you get an event from that stream, send it through the pipe
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event_stream
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.for_each(move |_instant| {
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if let Ok(Async::Ready(Some(msg))) = client_agent.poll() {
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tx.unbounded_send(warp::ws::Message::text(msg.to_json_string()))
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.expect("No send error");
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};
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if time.elapsed() > Duration::from_secs(30) {
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tx.unbounded_send(warp::ws::Message::text("{}"))
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.expect("Can ping");
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time = Instant::now();
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}
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Ok(())
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})
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.then(move |result| {
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// TODO: consider whether we should manually drop closed connections here
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log::info!("WebSocket connection for {:?} closed.", timeline);
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result
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})
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.map_err(move |e| log::warn!("Error sending to {:?}: {}", timeline, e))
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}
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pub fn to_sse(
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mut client_agent: ClientAgent,
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connection: warp::sse::Sse,
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update_interval: Duration,
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) ->impl warp::reply::Reply {
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let event_stream =
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tokio::timer::Interval::new(Instant::now(), update_interval).filter_map(move |_| {
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match client_agent.poll() {
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Ok(Async::Ready(Some(event))) => Some((
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warp::sse::event(event.event_name()),
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warp::sse::data(event.payload().unwrap_or_else(String::new)),
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)),
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_ => None,
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}
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});
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connection.reply(
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warp::sse::keep_alive()
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.interval(Duration::from_secs(30))
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.text("thump".to_string())
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.stream(event_stream),
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)
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}
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}
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