feat(presence,push) optionally suppress push notifications for active users

src/service/sending/sender.rs

@@ -19,14 +19,13 @@ use ruma::{
 	MilliSecondsSinceUnixEpoch, OwnedRoomId, OwnedServerName, OwnedUserId, RoomId, ServerName,
 	UInt,
 	api::{
-		appservice::event::push_events::v1::EphemeralData,
-		federation::transactions::{
+		appservice::event::push_events::v1::EphemeralData, federation::transactions::{
 			edu::{
 				DeviceListUpdateContent, Edu, PresenceContent, PresenceUpdate, ReceiptContent,
 				ReceiptData, ReceiptMap,
 			},
 			send_transaction_message,
-		},
+		}
 	},
 	device_id,
 	events::{
@@ -834,6 +833,26 @@ impl Service {
 				continue;
 			}
 
+			// optional suppression: heuristic combining presence age and recent sync activity.
+			if self.services.server.config.suppress_push_when_active {
+				if let Ok(presence) = self.services.presence.get_presence(&user_id).await {
+					let is_online = presence.content.presence == ruma::presence::PresenceState::Online;
+					let presence_age_ms = presence
+						.content
+						.last_active_ago
+						.map(u64::from)
+						.unwrap_or(u64::MAX);
+					let sync_gap_ms = self.services.presence.last_sync_gap_ms(&user_id).await;
+					let considered_active = is_online
+						&& presence_age_ms < 65_000
+						&& sync_gap_ms.is_some_and(|gap| gap < 32_000);
+					if considered_active {
+						trace!(?user_id, presence_age_ms, sync_gap_ms, "suppressing push: active heuristic");
+						continue;
+					}
+				}
+			}
+
 			let rules_for_user = self
 				.services
 				.account_data