mirror of https://github.com/mastodon/flodgatt
109 lines
4.5 KiB
Rust
109 lines
4.5 KiB
Rust
use super::ClientAgent;
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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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use warp::{
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reply::Reply,
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sse::Sse,
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ws::{Message, WebSocket},
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};
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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 send_to_ws(
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ws: WebSocket,
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mut client_agent: ClientAgent,
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interval: Duration,
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) -> impl Future<Item = (), Error = ()> {
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let (transmit_to_ws, _receive_from_ws) = ws.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(transmit_to_ws)
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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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let mut last_ping_time = Instant::now();
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tokio::timer::Interval::new(Instant::now(), interval)
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.take_while(move |_| {
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// Right now, we do not need to see if we have any messages _from_ the
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// WebSocket connection because the API doesn't support clients sending
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// commands via the WebSocket. However, if the [stream multiplexing API
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// change](github.com/tootsuite/flodgatt/issues/121) is implemented, we'll
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// need to receive messages from the client. If so, we'll need a
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// `receive_from_ws.poll() call here (or later)`
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match client_agent.poll() {
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Ok(Async::Ready(Some(msg))) => {
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match tx.unbounded_send(Message::text(msg.to_json_string())) {
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Ok(_) => futures::future::ok(true),
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Err(_) => client_agent.disconnect(),
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}
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}
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Ok(Async::Ready(None)) => {
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log::info!("WebSocket ClientAgent got Ready(None)");
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futures::future::ok(true)
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}
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Ok(Async::NotReady) if last_ping_time.elapsed() > Duration::from_secs(30) => {
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last_ping_time = Instant::now();
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match tx.unbounded_send(Message::text("{}")) {
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Ok(_) => futures::future::ok(true),
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Err(_) => client_agent.disconnect(),
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}
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}
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Ok(Async::NotReady) => futures::future::ok(true), // no new messages; nothing to do
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Err(e) => {
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log::error!("{}\n Dropping WebSocket message and continuing.", e);
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futures::future::ok(true)
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}
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}
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})
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.for_each(move |_instant| Ok(()))
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.then(move |result| {
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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 send_to_sse(mut client_agent: ClientAgent, sse: Sse, interval: Duration) -> impl Reply {
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let event_stream =
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tokio::timer::Interval::new(Instant::now(), 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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Ok(Async::Ready(None)) => {
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log::info!("SSE ClientAgent got Ready(None)");
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None
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}
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Ok(Async::NotReady) => None,
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Err(e) => {
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log::error!("{}\n Dropping SSE message and continuing.", e);
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None
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}
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}
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});
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sse.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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