style(presence): make type alias for presence_since iter

src/database/key_value/rooms/edus/presence.rs

@@ -13,7 +13,8 @@ use tokio::{sync::mpsc, time::sleep};
 
 use crate::{
     database::KeyValueDatabase,
-    service, services, utils,
+    service::{self, rooms::edus::presence::PresenceIter},
+    services, utils,
     utils::{millis_since_unix_epoch, u64_from_bytes},
     Error, Result,
 };
@@ -148,11 +149,7 @@ impl service::rooms::edus::presence::Data for KeyValueDatabase {
             .transpose()
     }
 
-    fn presence_since<'a>(
-        &'a self,
-        room_id: &RoomId,
-        since: u64,
-    ) -> Result<Box<dyn Iterator<Item = (OwnedUserId, PresenceEvent)> + 'a>> {
+    fn presence_since<'a>(&'a self, room_id: &RoomId, since: u64) -> Result<PresenceIter<'a>> {
         let user_timestamp: HashMap<OwnedUserId, u64> = self
             .userid_presenceupdate
             .iter()

src/service/rooms/edus/presence/data.rs

@@ -2,6 +2,8 @@ use crate::Result;
 use ruma::{events::presence::PresenceEvent, OwnedUserId, RoomId, UserId};
 use tokio::sync::mpsc;
 
+use super::PresenceIter;
+
 pub trait Data: Send + Sync {
     /// Adds a presence event which will be saved until a new event replaces it.
     ///
@@ -34,11 +36,7 @@ pub trait Data: Send + Sync {
     ) -> Result<Option<PresenceEvent>>;
 
     /// Returns the most recent presence updates that happened after the event with id `since`.
-    fn presence_since<'a>(
-        &'a self,
-        room_id: &RoomId,
-        since: u64,
-    ) -> Result<Box<dyn Iterator<Item = (OwnedUserId, PresenceEvent)> + 'a>>;
+    fn presence_since<'a>(&'a self, room_id: &RoomId, since: u64) -> Result<PresenceIter<'a>>;
 
     fn presence_maintain(&self, timer_receiver: mpsc::UnboundedReceiver<OwnedUserId>)
         -> Result<()>;

src/service/rooms/edus/presence/mod.rs

@@ -6,6 +6,8 @@ use tokio::sync::mpsc;
 
 use crate::{services, Error, Result};
 
+pub(crate) type PresenceIter<'a> = Box<dyn Iterator<Item = (OwnedUserId, PresenceEvent)> + 'a>;
+
 pub struct Service {
     pub db: &'static dyn Data,
 
@@ -99,11 +101,7 @@ impl Service {
 
     /// Returns the most recent presence updates that happened after the event with id `since`.
     #[tracing::instrument(skip(self, since, room_id))]
-    pub fn presence_since(
-        &self,
-        room_id: &RoomId,
-        since: u64,
-    ) -> Result<Box<dyn Iterator<Item = (OwnedUserId, PresenceEvent)>>> {
+    pub fn presence_since<'a>(&'a self, room_id: &RoomId, since: u64) -> Result<PresenceIter<'a>> {
         if !services().globals.allow_presence() {
             return Ok(Box::new(std::iter::empty()));
         }