simplify usage of mpmc channels which don't require receiver lock

Signed-off-by: Jason Volk <jason@zemos.net>

src/service/admin/mod.rs

@@ -20,14 +20,13 @@ use ruma::{
 	events::room::message::{Relation, RoomMessageEventContent},
 	OwnedEventId, OwnedRoomId, RoomId, UserId,
 };
-use tokio::sync::{Mutex, RwLock};
+use tokio::sync::RwLock;
 
 use crate::{account_data, globals, rooms, rooms::state::RoomMutexGuard, Dep};
 
 pub struct Service {
 	services: Services,
-	sender: Sender<CommandInput>,
+	channel: (Sender<CommandInput>, Receiver<CommandInput>),
-	receiver: Mutex<Receiver<CommandInput>>,
 	pub handle: RwLock<Option<Processor>>,
 	pub complete: StdRwLock<Option<Completer>>,
 	#[cfg(feature = "console")]
@@ -78,7 +77,6 @@ const COMMAND_QUEUE_LIMIT: usize = 512;
 #[async_trait]
 impl crate::Service for Service {
 	fn build(args: crate::Args<'_>) -> Result<Arc<Self>> {
-		let (sender, receiver) = loole::bounded(COMMAND_QUEUE_LIMIT);
 		Ok(Arc::new(Self {
 			services: Services {
 				server: args.server.clone(),
@@ -90,8 +88,7 @@ impl crate::Service for Service {
 				account_data: args.depend::<account_data::Service>("account_data"),
 				services: None.into(),
 			},
-			sender,
+			channel: loole::bounded(COMMAND_QUEUE_LIMIT),
-			receiver: Mutex::new(receiver),
 			handle: RwLock::new(None),
 			complete: StdRwLock::new(None),
 			#[cfg(feature = "console")]
@@ -100,8 +97,8 @@ impl crate::Service for Service {
 	}
 
 	async fn worker(self: Arc<Self>) -> Result<()> {
-		let receiver = self.receiver.lock().await;
 		let mut signals = self.services.server.signal.subscribe();
+		let receiver = self.channel.1.clone();
 
 		self.startup_execute().await?;
 		self.console_auto_start().await;
@@ -128,8 +125,9 @@ impl crate::Service for Service {
 		#[cfg(feature = "console")]
 		self.console.interrupt();
 
-		if !self.sender.is_closed() {
+		let (sender, _) = &self.channel;
-			self.sender.close();
+		if !sender.is_closed() {
+			sender.close();
 		}
 	}
 
@@ -159,7 +157,8 @@ impl Service {
 	/// will take place on the service worker's task asynchronously. Errors if
 	/// the queue is full.
 	pub fn command(&self, command: String, reply_id: Option<OwnedEventId>) -> Result<()> {
-		self.sender
+		self.channel
+			.0
 			.send(CommandInput { command, reply_id })
 			.map_err(|e| err!("Failed to enqueue admin command: {e:?}"))
 	}

src/service/presence/mod.rs

@@ -6,15 +6,15 @@ use std::{sync::Arc, time::Duration};
 use async_trait::async_trait;
 use conduwuit::{checked, debug, error, result::LogErr, Error, Result, Server};
 use futures::{stream::FuturesUnordered, Stream, StreamExt, TryFutureExt};
+use loole::{Receiver, Sender};
 use ruma::{events::presence::PresenceEvent, presence::PresenceState, OwnedUserId, UInt, UserId};
-use tokio::{sync::Mutex, time::sleep};
+use tokio::time::sleep;
 
 use self::{data::Data, presence::Presence};
 use crate::{globals, users, Dep};
 
 pub struct Service {
-	timer_sender: loole::Sender<TimerType>,
+	timer_channel: (Sender<TimerType>, Receiver<TimerType>),
-	timer_receiver: Mutex<loole::Receiver<TimerType>>,
 	timeout_remote_users: bool,
 	idle_timeout: u64,
 	offline_timeout: u64,
@@ -36,10 +36,8 @@ impl crate::Service for Service {
 		let config = &args.server.config;
 		let idle_timeout_s = config.presence_idle_timeout_s;
 		let offline_timeout_s = config.presence_offline_timeout_s;
-		let (timer_sender, timer_receiver) = loole::unbounded();
 		Ok(Arc::new(Self {
-			timer_sender,
+			timer_channel: loole::unbounded(),
-			timer_receiver: Mutex::new(timer_receiver),
 			timeout_remote_users: config.presence_timeout_remote_users,
 			idle_timeout: checked!(idle_timeout_s * 1_000)?,
 			offline_timeout: checked!(offline_timeout_s * 1_000)?,
@@ -53,8 +51,9 @@ impl crate::Service for Service {
 	}
 
 	async fn worker(self: Arc<Self>) -> Result<()> {
+		let receiver = self.timer_channel.1.clone();
+
 		let mut presence_timers = FuturesUnordered::new();
-		let receiver = self.timer_receiver.lock().await;
 		while !receiver.is_closed() {
 			tokio::select! {
 				Some(user_id) = presence_timers.next() => {
@@ -74,8 +73,9 @@ impl crate::Service for Service {
 	}
 
 	fn interrupt(&self) {
-		if !self.timer_sender.is_closed() {
+		let (timer_sender, _) = &self.timer_channel;
-			self.timer_sender.close();
+		if !timer_sender.is_closed() {
+			timer_sender.close();
 		}
 	}
 
@@ -150,7 +150,8 @@ impl Service {
 				| _ => self.services.server.config.presence_offline_timeout_s,
 			};
 
-			self.timer_sender
+			self.timer_channel
+				.0
 				.send((user_id.to_owned(), Duration::from_secs(timeout)))
 				.map_err(|e| {
 					error!("Failed to add presence timer: {}", e);