mirror of https://github.com/mastodon/flodgatt
94 lines
3.3 KiB
Rust
94 lines
3.3 KiB
Rust
//! Stream the updates appropriate for a given `User`/`timeline` pair from Redis.
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pub mod client_agent;
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pub mod receiver;
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pub mod redis_cmd;
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pub mod redis_stream;
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use crate::config;
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pub use client_agent::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;
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/// Send a stream of replies to a Server Sent Events client.
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pub fn send_updates_to_sse(
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mut client_agent: ClientAgent,
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connection: warp::sse::Sse,
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update_interval: time::Duration,
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) -> impl warp::reply::Reply {
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let event_stream = tokio::timer::Interval::new(time::Instant::now(), update_interval)
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.filter_map(move |_| match client_agent.poll() {
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Ok(Async::Ready(Some(json_value))) => Some((
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warp::sse::event(json_value["event"].clone().to_string()),
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warp::sse::data(json_value["payload"].clone()),
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)),
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_ => None,
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});
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connection.reply(
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warp::sse::keep_alive()
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.interval(time::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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/// Send a stream of replies to a WebSocket client.
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pub fn send_updates_to_ws(
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socket: warp::ws::WebSocket,
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mut stream: ClientAgent,
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update_interval: time::Duration,
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) -> impl futures::future::Future<Item = (), Error = ()> {
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let (ws_tx, mut ws_rx) = socket.split();
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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| eprintln!("websocket send error: {}", e)),
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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(time::Instant::now(), update_interval)
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.take_while(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");
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futures::future::ok(false)
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}
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Err(e) => {
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log::warn!("{}", e);
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futures::future::ok(false)
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}
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});
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let mut time = 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(json_value))) = stream.poll() {
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let msg = warp::ws::Message::text(json_value.to_string());
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tx.unbounded_send(msg).expect("No send error");
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};
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if time.elapsed() > time::Duration::from_secs(30) {
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let msg = warp::ws::Message::ping(Vec::new());
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tx.unbounded_send(msg).expect("Can ping");
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time = 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 closed.");
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result
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})
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.map_err(move |e| log::error!("{}", e))
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}
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