mirror of https://github.com/mastodon/flodgatt
139 lines
4.4 KiB
Rust
139 lines
4.4 KiB
Rust
//! Receives data from Redis, sorts it by `ClientAgent`, and stores it until
|
|
//! polled by the correct `ClientAgent`. Also manages sububscriptions and
|
|
//! unsubscriptions to/from Redis.
|
|
mod err;
|
|
pub use err::ManagerErr;
|
|
|
|
use super::{RedisCmd, RedisConn};
|
|
use crate::config;
|
|
use crate::event::Event;
|
|
use crate::request::{Stream, Subscription, Timeline};
|
|
|
|
use futures::{Async, Stream as _Stream};
|
|
use hashbrown::HashMap;
|
|
use std::sync::{Arc, Mutex, MutexGuard, PoisonError};
|
|
use std::time::{Duration, Instant};
|
|
use tokio::sync::{mpsc, watch};
|
|
|
|
type Result<T> = std::result::Result<T, ManagerErr>;
|
|
|
|
/// The item that streams from Redis and is polled by the `ClientAgent`
|
|
#[derive(Debug)]
|
|
pub struct Manager {
|
|
redis_connection: RedisConn,
|
|
clients_per_timeline: HashMap<Timeline, i32>,
|
|
tx: watch::Sender<(Timeline, Event)>,
|
|
rx: mpsc::UnboundedReceiver<Timeline>,
|
|
ping_time: Instant,
|
|
}
|
|
|
|
impl Manager {
|
|
/// Create a new `Manager`, with its own Redis connections (but, as yet, no
|
|
/// active subscriptions).
|
|
pub fn try_from(
|
|
redis_cfg: config::Redis,
|
|
tx: watch::Sender<(Timeline, Event)>,
|
|
rx: mpsc::UnboundedReceiver<Timeline>,
|
|
) -> Result<Self> {
|
|
Ok(Self {
|
|
redis_connection: RedisConn::new(redis_cfg)?,
|
|
clients_per_timeline: HashMap::new(),
|
|
tx,
|
|
rx,
|
|
ping_time: Instant::now(),
|
|
})
|
|
}
|
|
|
|
pub fn into_arc(self) -> Arc<Mutex<Self>> {
|
|
Arc::new(Mutex::new(self))
|
|
}
|
|
|
|
pub fn subscribe(&mut self, subscription: &Subscription) {
|
|
let (tag, tl) = (subscription.hashtag_name.clone(), subscription.timeline);
|
|
if let (Some(hashtag), Timeline(Stream::Hashtag(id), _, _)) = (tag, tl) {
|
|
self.redis_connection.update_cache(hashtag, id);
|
|
};
|
|
|
|
let number_of_subscriptions = self
|
|
.clients_per_timeline
|
|
.entry(tl)
|
|
.and_modify(|n| *n += 1)
|
|
.or_insert(1);
|
|
|
|
use RedisCmd::*;
|
|
if *number_of_subscriptions == 1 {
|
|
self.redis_connection
|
|
.send_cmd(Subscribe, &tl)
|
|
.unwrap_or_else(|e| log::error!("Could not subscribe to the Redis channel: {}", e));
|
|
};
|
|
}
|
|
|
|
pub fn unsubscribe(&mut self, tl: Timeline) -> Result<()> {
|
|
let number_of_subscriptions = self
|
|
.clients_per_timeline
|
|
.entry(tl)
|
|
.and_modify(|n| *n -= 1)
|
|
.or_insert_with(|| {
|
|
log::error!(
|
|
"Attempted to unsubscribe from a timeline to which you were not subscribed: {:?}",
|
|
tl
|
|
);
|
|
0
|
|
});
|
|
use RedisCmd::*;
|
|
if *number_of_subscriptions == 0 {
|
|
self.redis_connection.send_cmd(Unsubscribe, &tl)?;
|
|
self.clients_per_timeline.remove_entry(&tl);
|
|
};
|
|
log::info!("Ended stream for {:?}", tl);
|
|
Ok(())
|
|
}
|
|
|
|
pub fn poll_broadcast(&mut self) -> Result<()> {
|
|
while let Ok(Async::Ready(Some(tl))) = self.rx.poll() {
|
|
self.unsubscribe(tl)?
|
|
}
|
|
|
|
if self.ping_time.elapsed() > Duration::from_secs(30) {
|
|
self.ping_time = Instant::now();
|
|
self.tx.broadcast((Timeline::empty(), Event::Ping))?
|
|
} else {
|
|
match self.redis_connection.poll_redis() {
|
|
Ok(Async::NotReady) => (),
|
|
Ok(Async::Ready(Some((timeline, event)))) => {
|
|
self.tx.broadcast((timeline, event))?
|
|
}
|
|
Ok(Async::Ready(None)) => (), // subscription cmd or msg for other namespace
|
|
Err(err) => log::error!("{}", err), // drop msg, log err, and proceed
|
|
}
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn recover(poisoned: PoisonError<MutexGuard<Self>>) -> MutexGuard<Self> {
|
|
log::error!("{}", &poisoned);
|
|
poisoned.into_inner()
|
|
}
|
|
|
|
pub fn count(&self) -> String {
|
|
format!(
|
|
"Current connections: {}",
|
|
self.clients_per_timeline.values().sum::<i32>()
|
|
)
|
|
}
|
|
|
|
pub fn list(&self) -> String {
|
|
let max_len = self
|
|
.clients_per_timeline
|
|
.keys()
|
|
.fold(0, |acc, el| acc.max(format!("{:?}:", el).len()));
|
|
self.clients_per_timeline
|
|
.iter()
|
|
.map(|(tl, n)| {
|
|
let tl_txt = format!("{:?}:", tl);
|
|
format!("{:>1$} {2}\n", tl_txt, max_len, n)
|
|
})
|
|
.collect()
|
|
}
|
|
}
|