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use internal::prelude::*;
use internal::ws_impl::ReceiverExt;
use model::event::{Event, GatewayEvent};
use parking_lot::Mutex as ParkingLotMutex;
use std::sync::mpsc::{self, Receiver, Sender};
use std::sync::Arc;
use super::super::super::{EventHandler, dispatch};
use super::{LockedShard, ShardId, ShardManagerMessage};
use threadpool::ThreadPool;
use typemap::ShareMap;
use websocket::WebSocketError;
#[cfg(feature = "framework")]
use framework::Framework;
#[cfg(feature = "framework")]
use std::sync::Mutex;
pub struct ShardRunner<H: EventHandler + Send + Sync + 'static> {
data: Arc<ParkingLotMutex<ShareMap>>,
event_handler: Arc<H>,
#[cfg(feature = "framework")]
framework: Arc<Mutex<Option<Box<Framework + Send>>>>,
manager_tx: Sender<ShardManagerMessage>,
runner_rx: Receiver<ShardManagerMessage>,
runner_tx: Sender<ShardManagerMessage>,
shard: LockedShard,
shard_info: [u64; 2],
threadpool: ThreadPool,
}
impl<H: EventHandler + Send + Sync + 'static> ShardRunner<H> {
#[cfg(feature = "framework")]
pub fn new(
shard: LockedShard,
manager_tx: Sender<ShardManagerMessage>,
framework: Arc<Mutex<Option<Box<Framework + Send>>>>,
data: Arc<ParkingLotMutex<ShareMap>>,
event_handler: Arc<H>,
threadpool: ThreadPool,
) -> Self {
let (tx, rx) = mpsc::channel();
let shard_info = shard.lock().shard_info();
Self {
runner_rx: rx,
runner_tx: tx,
data,
event_handler,
framework,
manager_tx,
shard,
shard_info,
threadpool,
}
}
#[cfg(not(feature = "framework"))]
pub fn new(
shard: LockedShard,
manager_tx: Sender<ShardManagerMessage>,
data: Arc<ParkingLotMutex<ShareMap>>,
event_handler: Arc<H>,
threadpool: ThreadPool,
) -> Self {
let (tx, rx) = mpsc::channel();
let shard_info = shard.lock().shard_info();
Self {
runner_rx: rx,
runner_tx: tx,
data,
event_handler,
manager_tx,
shard,
shard_info,
threadpool,
}
}
pub fn run(&mut self) -> Result<()> {
debug!("[ShardRunner {:?}] Running", self.shard_info);
loop {
{
let mut shard = self.shard.lock();
let incoming = self.runner_rx.try_recv();
// Check for an incoming message over the runner channel.
//
// If the message is to shutdown, first verify the ID so we know
// for certain this runner is to shutdown.
if let Ok(ShardManagerMessage::Shutdown(id)) = incoming {
if id.0 == self.shard_info[0] {
let _ = shard.shutdown_clean();
return Ok(());
}
}
if let Err(why) = shard.check_heartbeat() {
error!("Failed to heartbeat and reconnect: {:?}", why);
return self.request_restart();
}
#[cfg(feature = "voice")]
{
shard.cycle_voice_recv();
}
}
let (event, successful) = self.recv_event();
if let Some(event) = event {
let data = self.data.clone();
let event_handler = self.event_handler.clone();
let shard = self.shard.clone();
feature_framework! {{
let framework = self.framework.clone();
self.threadpool.execute(|| {
dispatch(
event,
shard,
framework,
data,
event_handler,
);
});
} else {
self.threadpool.execute(|| {
dispatch(
event,
shard,
data,
event_handler,
);
});
}}
}
if !successful && !self.shard.lock().stage().is_connecting() {
return self.request_restart();
}
}
}
pub(super) fn runner_tx(&self) -> Sender<ShardManagerMessage> {
self.runner_tx.clone()
}
/// Returns a received event, as well as whether reading the potentially
/// present event was successful.
fn recv_event(&mut self) -> (Option<Event>, bool) {
let mut shard = self.shard.lock();
let gw_event = match shard.client.recv_json(GatewayEvent::decode) {
Err(Error::WebSocket(WebSocketError::IoError(_))) => {
// Check that an amount of time at least double the
// heartbeat_interval has passed.
//
// If not, continue on trying to receive messages.
//
// If it has, attempt to auto-reconnect.
let last = shard.last_heartbeat_ack();
let interval = shard.heartbeat_interval();
if let (Some(last_heartbeat_ack), Some(interval)) = (last, interval) {
let seconds_passed = last_heartbeat_ack.elapsed().as_secs();
let interval_in_secs = interval / 1000;
if seconds_passed <= interval_in_secs * 2 {
return (None, true);
}
} else {
return (None, true);
}
debug!("Attempting to auto-reconnect");
if let Err(why) = shard.autoreconnect() {
error!("Failed to auto-reconnect: {:?}", why);
}
return (None, true);
},
Err(Error::WebSocket(WebSocketError::NoDataAvailable)) => {
// This is hit when the websocket client dies this will be
// hit every iteration.
return (None, false);
},
other => other,
};
let event = match gw_event {
Ok(Some(event)) => Ok(event),
Ok(None) => return (None, true),
Err(why) => Err(why),
};
let event = match shard.handle_event(event) {
Ok(Some(event)) => event,
Ok(None) => return (None, true),
Err(why) => {
error!("Shard handler received err: {:?}", why);
return (None, true);
},
};
(Some(event), true)
}
fn request_restart(&self) -> Result<()> {
debug!("[ShardRunner {:?}] Requesting restart", self.shard_info);
let msg = ShardManagerMessage::Restart(ShardId(self.shard_info[0]));
let _ = self.manager_tx.send(msg);
Ok(())
}
}
|