Add initial MSC4186 (Simplified Sliding Sync) implementation

Signed-off-by: morguldir <morguldir@protonmail.com>
Signed-off-by: strawberry <strawberry@puppygock.gay>

src/api/client/sync/mod.rs

@@ -1,16 +1,31 @@
 mod v3;
 mod v4;
+mod v5;
 
 use conduwuit::{
-	utils::stream::{BroadbandExt, ReadyExt, TryIgnore},
+	utils::{
+		stream::{BroadbandExt, ReadyExt, TryIgnore},
+		IterStream,
+	},
 	PduCount,
 };
 use futures::{pin_mut, StreamExt};
-use ruma::{RoomId, UserId};
+use ruma::{
+	directory::RoomTypeFilter,
+	events::TimelineEventType::{
+		self, Beacon, CallInvite, PollStart, RoomEncrypted, RoomMessage, Sticker,
+	},
+	RoomId, UserId,
+};
 
-pub(crate) use self::{v3::sync_events_route, v4::sync_events_v4_route};
+pub(crate) use self::{
+	v3::sync_events_route, v4::sync_events_v4_route, v5::sync_events_v5_route,
+};
 use crate::{service::Services, Error, PduEvent, Result};
 
+pub(crate) const DEFAULT_BUMP_TYPES: &[TimelineEventType; 6] =
+	&[CallInvite, PollStart, Beacon, RoomEncrypted, RoomMessage, Sticker];
+
 async fn load_timeline(
 	services: &Services,
 	sender_user: &UserId,
@@ -69,3 +84,33 @@ async fn share_encrypted_room(
 		})
 		.await
 }
+
+pub(crate) async fn filter_rooms<'a>(
+	services: &Services,
+	rooms: &[&'a RoomId],
+	filter: &[RoomTypeFilter],
+	negate: bool,
+) -> Vec<&'a RoomId> {
+	rooms
+		.iter()
+		.stream()
+		.filter_map(|r| async move {
+			let room_type = services.rooms.state_accessor.get_room_type(r).await;
+
+			if room_type.as_ref().is_err_and(|e| !e.is_not_found()) {
+				return None;
+			}
+
+			let room_type_filter = RoomTypeFilter::from(room_type.ok());
+
+			let include = if negate {
+				!filter.contains(&room_type_filter)
+			} else {
+				filter.is_empty() || filter.contains(&room_type_filter)
+			};
+
+			include.then_some(r)
+		})
+		.collect()
+		.await
+}

src/api/client/sync/v4.rs

@@ -23,24 +23,23 @@ use ruma::{
 			DeviceLists, UnreadNotificationsCount,
 		},
 	},
-	directory::RoomTypeFilter,
 	events::{
 		room::member::{MembershipState, RoomMemberEventContent},
 		AnyRawAccountDataEvent, AnySyncEphemeralRoomEvent, StateEventType,
-		TimelineEventType::{self, *},
+		TimelineEventType::*,
 	},
 	serde::Raw,
-	uint, MilliSecondsSinceUnixEpoch, OwnedEventId, OwnedRoomId, OwnedUserId, UInt,
+	uint, MilliSecondsSinceUnixEpoch, OwnedEventId, OwnedRoomId, OwnedUserId, RoomId, UInt,
 };
-use service::{rooms::read_receipt::pack_receipts, Services};
+use service::rooms::read_receipt::pack_receipts;
 
 use super::{load_timeline, share_encrypted_room};
-use crate::{client::ignored_filter, Ruma};
+use crate::{
+	client::{filter_rooms, ignored_filter, sync::v5::TodoRooms, DEFAULT_BUMP_TYPES},
+	Ruma,
+};
 
-const SINGLE_CONNECTION_SYNC: &str = "single_connection_sync";
-
-const DEFAULT_BUMP_TYPES: &[TimelineEventType; 6] =
-	&[CallInvite, PollStart, Beacon, RoomEncrypted, RoomMessage, Sticker];
+pub(crate) const SINGLE_CONNECTION_SYNC: &str = "single_connection_sync";
 
 /// POST `/_matrix/client/unstable/org.matrix.msc3575/sync`
 ///
@@ -121,13 +120,19 @@ pub(crate) async fn sync_events_v4_route(
 		.collect()
 		.await;
 
-	let all_rooms = all_joined_rooms
+	let all_invited_rooms: Vec<&RoomId> = all_invited_rooms.iter().map(AsRef::as_ref).collect();
+	let all_knocked_rooms: Vec<&RoomId> = all_knocked_rooms.iter().map(AsRef::as_ref).collect();
+
+	let all_rooms: Vec<&RoomId> = all_joined_rooms
 		.iter()
-		.chain(all_invited_rooms.iter())
-		.chain(all_knocked_rooms.iter())
-		.map(Clone::clone)
+		.map(AsRef::as_ref)
+		.chain(all_invited_rooms.iter().map(AsRef::as_ref))
+		.chain(all_knocked_rooms.iter().map(AsRef::as_ref))
 		.collect();
 
+	let all_joined_rooms = all_joined_rooms.iter().map(AsRef::as_ref).collect();
+	let all_invited_rooms = all_invited_rooms.iter().map(AsRef::as_ref).collect();
+
 	if body.extensions.to_device.enabled.unwrap_or(false) {
 		services
 			.users
@@ -180,6 +185,7 @@ pub(crate) async fn sync_events_v4_route(
 		);
 
 		for room_id in &all_joined_rooms {
+			let room_id: &&RoomId = room_id;
 			let Ok(current_shortstatehash) =
 				services.rooms.state.get_room_shortstatehash(room_id).await
 			else {
@@ -332,7 +338,7 @@ pub(crate) async fn sync_events_v4_route(
 	}
 
 	let mut lists = BTreeMap::new();
-	let mut todo_rooms = BTreeMap::new(); // and required state
+	let mut todo_rooms: TodoRooms = BTreeMap::new(); // and required state
 
 	for (list_id, list) in &body.lists {
 		let active_rooms = match list.filters.clone().and_then(|f| f.is_invite) {
@@ -353,7 +359,7 @@ pub(crate) async fn sync_events_v4_route(
 			| None => active_rooms,
 		};
 
-		let mut new_known_rooms = BTreeSet::new();
+		let mut new_known_rooms: BTreeSet<OwnedRoomId> = BTreeSet::new();
 
 		let ranges = list.ranges.clone();
 		lists.insert(list_id.clone(), sync_events::v4::SyncList {
@@ -375,9 +381,9 @@ pub(crate) async fn sync_events_v4_route(
 						Vec::new()
 					};
 
-					new_known_rooms.extend(room_ids.iter().cloned());
+					new_known_rooms.extend(room_ids.clone().into_iter().map(ToOwned::to_owned));
 					for room_id in &room_ids {
-						let todo_room = todo_rooms.entry(room_id.clone()).or_insert((
+						let todo_room = todo_rooms.entry((*room_id).to_owned()).or_insert((
 							BTreeSet::new(),
 							0_usize,
 							u64::MAX,
@@ -399,7 +405,7 @@ pub(crate) async fn sync_events_v4_route(
 						todo_room.2 = todo_room.2.min(
 							known_rooms
 								.get(list_id.as_str())
-								.and_then(|k| k.get(room_id))
+								.and_then(|k| k.get(*room_id))
 								.copied()
 								.unwrap_or(0),
 						);
@@ -408,7 +414,7 @@ pub(crate) async fn sync_events_v4_route(
 						op: SlidingOp::Sync,
 						range: Some(r),
 						index: None,
-						room_ids,
+						room_ids: room_ids.into_iter().map(ToOwned::to_owned).collect(),
 						room_id: None,
 					}
 				})
@@ -418,8 +424,8 @@ pub(crate) async fn sync_events_v4_route(
 
 		if let Some(conn_id) = &body.conn_id {
 			services.sync.update_sync_known_rooms(
-				sender_user.clone(),
-				sender_device.clone(),
+				sender_user,
+				&sender_device,
 				conn_id.clone(),
 				list_id.clone(),
 				new_known_rooms,
@@ -464,8 +470,8 @@ pub(crate) async fn sync_events_v4_route(
 
 	if let Some(conn_id) = &body.conn_id {
 		services.sync.update_sync_known_rooms(
-			sender_user.clone(),
-			sender_device.clone(),
+			sender_user,
+			&sender_device,
 			conn_id.clone(),
 			"subscriptions".to_owned(),
 			known_subscription_rooms,
@@ -489,7 +495,8 @@ pub(crate) async fn sync_events_v4_route(
 		let mut timestamp: Option<_> = None;
 		let mut invite_state = None;
 		let (timeline_pdus, limited);
-		if all_invited_rooms.contains(room_id) {
+		let new_room_id: &RoomId = (*room_id).as_ref();
+		if all_invited_rooms.contains(&new_room_id) {
 			// TODO: figure out a timestamp we can use for remote invites
 			invite_state = services
 				.rooms
@@ -519,7 +526,7 @@ pub(crate) async fn sync_events_v4_route(
 		}
 
 		account_data.rooms.insert(
-			room_id.clone(),
+			room_id.to_owned(),
 			services
 				.account_data
 				.changes_since(Some(room_id), sender_user, *roomsince)
@@ -749,10 +756,9 @@ pub(crate) async fn sync_events_v4_route(
 		});
 	}
 
-	if rooms
-		.iter()
-		.all(|(_, r)| r.timeline.is_empty() && r.required_state.is_empty())
-	{
+	if rooms.iter().all(|(id, r)| {
+		r.timeline.is_empty() && r.required_state.is_empty() && !receipts.rooms.contains_key(id)
+	}) {
 		// Hang a few seconds so requests are not spammed
 		// Stop hanging if new info arrives
 		let default = Duration::from_secs(30);
@@ -798,33 +804,3 @@ pub(crate) async fn sync_events_v4_route(
 		delta_token: None,
 	})
 }
-
-async fn filter_rooms(
-	services: &Services,
-	rooms: &[OwnedRoomId],
-	filter: &[RoomTypeFilter],
-	negate: bool,
-) -> Vec<OwnedRoomId> {
-	rooms
-		.iter()
-		.stream()
-		.filter_map(|r| async move {
-			let room_type = services.rooms.state_accessor.get_room_type(r).await;
-
-			if room_type.as_ref().is_err_and(|e| !e.is_not_found()) {
-				return None;
-			}
-
-			let room_type_filter = RoomTypeFilter::from(room_type.ok());
-
-			let include = if negate {
-				!filter.contains(&room_type_filter)
-			} else {
-				filter.is_empty() || filter.contains(&room_type_filter)
-			};
-
-			include.then_some(r.to_owned())
-		})
-		.collect()
-		.await
-}

src/api/client/sync/v5.rs

@@ -0,0 +1,886 @@
+use std::{
+	cmp::{self, Ordering},
+	collections::{BTreeMap, BTreeSet, HashMap, HashSet},
+	time::Duration,
+};
+
+use axum::extract::State;
+use conduwuit::{
+	debug, error, extract_variant, trace,
+	utils::{
+		math::{ruma_from_usize, usize_from_ruma},
+		BoolExt, IterStream, ReadyExt, TryFutureExtExt,
+	},
+	warn, Error, Result,
+};
+use futures::{FutureExt, StreamExt, TryFutureExt};
+use ruma::{
+	api::client::{
+		error::ErrorKind,
+		sync::sync_events::{self, DeviceLists, UnreadNotificationsCount},
+	},
+	events::{
+		room::member::{MembershipState, RoomMemberEventContent},
+		AnyRawAccountDataEvent, AnySyncEphemeralRoomEvent, StateEventType, TimelineEventType,
+	},
+	serde::Raw,
+	state_res::TypeStateKey,
+	uint, DeviceId, OwnedEventId, OwnedRoomId, OwnedUserId, RoomId, UInt, UserId,
+};
+use service::{rooms::read_receipt::pack_receipts, PduCount};
+
+use super::{filter_rooms, share_encrypted_room};
+use crate::{
+	client::{ignored_filter, sync::load_timeline, DEFAULT_BUMP_TYPES},
+	Ruma,
+};
+
+type SyncInfo<'a> = (&'a UserId, &'a DeviceId, u64, &'a sync_events::v5::Request);
+
+/// `POST /_matrix/client/unstable/org.matrix.simplified_msc3575/sync`
+/// ([MSC4186])
+///
+/// A simplified version of sliding sync ([MSC3575]).
+///
+/// Get all new events in a sliding window of rooms since the last sync or a
+/// given point in time.
+///
+/// [MSC3575]: https://github.com/matrix-org/matrix-spec-proposals/pull/3575
+/// [MSC4186]: https://github.com/matrix-org/matrix-spec-proposals/pull/4186
+pub(crate) async fn sync_events_v5_route(
+	State(services): State<crate::State>,
+	body: Ruma<sync_events::v5::Request>,
+) -> Result<sync_events::v5::Response> {
+	debug_assert!(DEFAULT_BUMP_TYPES.is_sorted(), "DEFAULT_BUMP_TYPES is not sorted");
+	let sender_user = body.sender_user.as_ref().expect("user is authenticated");
+	let sender_device = body.sender_device.as_ref().expect("user is authenticated");
+	let mut body = body.body;
+
+	// Setup watchers, so if there's no response, we can wait for them
+	let watcher = services.sync.watch(sender_user, sender_device);
+
+	let next_batch = services.globals.next_count()?;
+
+	let conn_id = body.conn_id.clone();
+
+	let globalsince = body
+		.pos
+		.as_ref()
+		.and_then(|string| string.parse().ok())
+		.unwrap_or(0);
+
+	if globalsince != 0
+		&& !services.sync.snake_connection_cached(
+			sender_user.clone(),
+			sender_device.clone(),
+			conn_id.clone(),
+		) {
+		debug!("Restarting sync stream because it was gone from the database");
+		return Err(Error::Request(
+			ErrorKind::UnknownPos,
+			"Connection data lost since last time".into(),
+			http::StatusCode::BAD_REQUEST,
+		));
+	}
+
+	// Client / User requested an initial sync
+	if globalsince == 0 {
+		services.sync.forget_snake_sync_connection(
+			sender_user.clone(),
+			sender_device.clone(),
+			conn_id.clone(),
+		);
+	}
+
+	// Get sticky parameters from cache
+	let known_rooms = services.sync.update_snake_sync_request_with_cache(
+		sender_user.clone(),
+		sender_device.clone(),
+		&mut body,
+	);
+
+	let all_joined_rooms: Vec<_> = services
+		.rooms
+		.state_cache
+		.rooms_joined(sender_user)
+		.map(ToOwned::to_owned)
+		.collect()
+		.await;
+
+	let all_invited_rooms: Vec<_> = services
+		.rooms
+		.state_cache
+		.rooms_invited(sender_user)
+		.map(|r| r.0)
+		.collect()
+		.await;
+
+	let all_knocked_rooms: Vec<_> = services
+		.rooms
+		.state_cache
+		.rooms_knocked(sender_user)
+		.map(|r| r.0)
+		.collect()
+		.await;
+
+	let all_rooms: Vec<&RoomId> = all_joined_rooms
+		.iter()
+		.map(AsRef::as_ref)
+		.chain(all_invited_rooms.iter().map(AsRef::as_ref))
+		.chain(all_knocked_rooms.iter().map(AsRef::as_ref))
+		.collect();
+
+	let all_joined_rooms = all_joined_rooms.iter().map(AsRef::as_ref).collect();
+	let all_invited_rooms = all_invited_rooms.iter().map(AsRef::as_ref).collect();
+
+	let pos = next_batch.clone().to_string();
+
+	let mut todo_rooms: TodoRooms = BTreeMap::new();
+
+	let sync_info: SyncInfo<'_> = (sender_user, sender_device, globalsince, &body);
+	let mut response = sync_events::v5::Response {
+		txn_id: body.txn_id.clone(),
+		pos,
+		lists: BTreeMap::new(),
+		rooms: BTreeMap::new(),
+		extensions: sync_events::v5::response::Extensions {
+			account_data: collect_account_data(services, sync_info).await,
+			e2ee: collect_e2ee(services, sync_info, &all_joined_rooms).await?,
+			to_device: collect_to_device(services, sync_info, next_batch).await,
+			receipts: collect_receipts(services).await,
+			typing: sync_events::v5::response::Typing::default(),
+		},
+	};
+
+	handle_lists(
+		services,
+		sync_info,
+		&all_invited_rooms,
+		&all_joined_rooms,
+		&all_rooms,
+		&mut todo_rooms,
+		&known_rooms,
+		&mut response,
+	)
+	.await;
+
+	fetch_subscriptions(services, sync_info, &known_rooms, &mut todo_rooms).await;
+
+	response.rooms = process_rooms(
+		services,
+		sender_user,
+		next_batch,
+		&all_invited_rooms,
+		&todo_rooms,
+		&mut response,
+		&body,
+	)
+	.await?;
+
+	if response.rooms.iter().all(|(id, r)| {
+		r.timeline.is_empty()
+			&& r.required_state.is_empty()
+			&& !response.extensions.receipts.rooms.contains_key(id)
+	}) && response
+		.extensions
+		.to_device
+		.clone()
+		.is_none_or(|to| to.events.is_empty())
+	{
+		// Hang a few seconds so requests are not spammed
+		// Stop hanging if new info arrives
+		let default = Duration::from_secs(30);
+		let duration = cmp::min(body.timeout.unwrap_or(default), default);
+		_ = tokio::time::timeout(duration, watcher).await;
+	}
+
+	trace!(
+		rooms=?response.rooms.len(),
+		account_data=?response.extensions.account_data.rooms.len(),
+		receipts=?response.extensions.receipts.rooms.len(),
+		"responding to request with"
+	);
+	Ok(response)
+}
+
+type KnownRooms = BTreeMap<String, BTreeMap<OwnedRoomId, u64>>;
+pub(crate) type TodoRooms = BTreeMap<OwnedRoomId, (BTreeSet<TypeStateKey>, usize, u64)>;
+
+async fn fetch_subscriptions(
+	services: crate::State,
+	(sender_user, sender_device, globalsince, body): SyncInfo<'_>,
+	known_rooms: &KnownRooms,
+	todo_rooms: &mut TodoRooms,
+) {
+	let mut known_subscription_rooms = BTreeSet::new();
+	for (room_id, room) in &body.room_subscriptions {
+		if !services.rooms.metadata.exists(room_id).await {
+			continue;
+		}
+		let todo_room =
+			todo_rooms
+				.entry(room_id.clone())
+				.or_insert((BTreeSet::new(), 0_usize, u64::MAX));
+
+		let limit: UInt = room.timeline_limit;
+
+		todo_room.0.extend(room.required_state.iter().cloned());
+		todo_room.1 = todo_room.1.max(usize_from_ruma(limit));
+		// 0 means unknown because it got out of date
+		todo_room.2 = todo_room.2.min(
+			known_rooms
+				.get("subscriptions")
+				.and_then(|k| k.get(room_id))
+				.copied()
+				.unwrap_or(0),
+		);
+		known_subscription_rooms.insert(room_id.clone());
+	}
+	// where this went (protomsc says it was removed)
+	//for r in body.unsubscribe_rooms {
+	//	known_subscription_rooms.remove(&r);
+	//	body.room_subscriptions.remove(&r);
+	//}
+
+	if let Some(conn_id) = &body.conn_id {
+		services.sync.update_snake_sync_known_rooms(
+			sender_user,
+			sender_device,
+			conn_id.clone(),
+			"subscriptions".to_owned(),
+			known_subscription_rooms,
+			globalsince,
+		);
+	}
+}
+
+#[allow(clippy::too_many_arguments)]
+async fn handle_lists<'a>(
+	services: crate::State,
+	(sender_user, sender_device, globalsince, body): SyncInfo<'_>,
+	all_invited_rooms: &Vec<&'a RoomId>,
+	all_joined_rooms: &Vec<&'a RoomId>,
+	all_rooms: &Vec<&'a RoomId>,
+	todo_rooms: &'a mut TodoRooms,
+	known_rooms: &'a KnownRooms,
+	response: &'_ mut sync_events::v5::Response,
+) -> KnownRooms {
+	for (list_id, list) in &body.lists {
+		let active_rooms = match list.filters.clone().and_then(|f| f.is_invite) {
+			| Some(true) => all_invited_rooms,
+			| Some(false) => all_joined_rooms,
+			| None => all_rooms,
+		};
+
+		let active_rooms = match list.filters.clone().map(|f| f.not_room_types) {
+			| Some(filter) if filter.is_empty() => active_rooms,
+			| Some(value) => &filter_rooms(&services, active_rooms, &value, true).await,
+			| None => active_rooms,
+		};
+
+		let mut new_known_rooms: BTreeSet<OwnedRoomId> = BTreeSet::new();
+
+		let ranges = list.ranges.clone();
+
+		for mut range in ranges {
+			range.0 = uint!(0);
+			range.1 = range
+				.1
+				.clamp(range.0, UInt::try_from(active_rooms.len()).unwrap_or(UInt::MAX));
+
+			let room_ids =
+				active_rooms[usize_from_ruma(range.0)..usize_from_ruma(range.1)].to_vec();
+
+			let new_rooms: BTreeSet<OwnedRoomId> =
+				room_ids.clone().into_iter().map(From::from).collect();
+			new_known_rooms.extend(new_rooms);
+			//new_known_rooms.extend(room_ids..cloned());
+			for room_id in room_ids {
+				let todo_room = todo_rooms.entry(room_id.to_owned()).or_insert((
+					BTreeSet::new(),
+					0_usize,
+					u64::MAX,
+				));
+
+				let limit: usize = usize_from_ruma(list.room_details.timeline_limit).min(100);
+
+				todo_room
+					.0
+					.extend(list.room_details.required_state.iter().cloned());
+
+				todo_room.1 = todo_room.1.max(limit);
+				// 0 means unknown because it got out of date
+				todo_room.2 = todo_room.2.min(
+					known_rooms
+						.get(list_id.as_str())
+						.and_then(|k| k.get(room_id))
+						.copied()
+						.unwrap_or(0),
+				);
+			}
+		}
+		response
+			.lists
+			.insert(list_id.clone(), sync_events::v5::response::List {
+				count: ruma_from_usize(active_rooms.len()),
+			});
+
+		if let Some(conn_id) = &body.conn_id {
+			services.sync.update_snake_sync_known_rooms(
+				sender_user,
+				sender_device,
+				conn_id.clone(),
+				list_id.clone(),
+				new_known_rooms,
+				globalsince,
+			);
+		}
+	}
+	BTreeMap::default()
+}
+
+async fn process_rooms(
+	services: crate::State,
+	sender_user: &UserId,
+	next_batch: u64,
+	all_invited_rooms: &[&RoomId],
+	todo_rooms: &TodoRooms,
+	response: &mut sync_events::v5::Response,
+	body: &sync_events::v5::Request,
+) -> Result<BTreeMap<OwnedRoomId, sync_events::v5::response::Room>> {
+	let mut rooms = BTreeMap::new();
+	for (room_id, (required_state_request, timeline_limit, roomsince)) in todo_rooms {
+		let roomsincecount = PduCount::Normal(*roomsince);
+
+		let mut timestamp: Option<_> = None;
+		let mut invite_state = None;
+		let (timeline_pdus, limited);
+		let new_room_id: &RoomId = (*room_id).as_ref();
+		if all_invited_rooms.contains(&new_room_id) {
+			// TODO: figure out a timestamp we can use for remote invites
+			invite_state = services
+				.rooms
+				.state_cache
+				.invite_state(sender_user, room_id)
+				.await
+				.ok();
+
+			(timeline_pdus, limited) = (Vec::new(), true);
+		} else {
+			(timeline_pdus, limited) = match load_timeline(
+				&services,
+				sender_user,
+				room_id,
+				roomsincecount,
+				Some(PduCount::from(next_batch)),
+				*timeline_limit,
+			)
+			.await
+			{
+				| Ok(value) => value,
+				| Err(err) => {
+					warn!("Encountered missing timeline in {}, error {}", room_id, err);
+					continue;
+				},
+			};
+		}
+
+		if body.extensions.account_data.enabled == Some(true) {
+			response.extensions.account_data.rooms.insert(
+				room_id.to_owned(),
+				services
+					.account_data
+					.changes_since(Some(room_id), sender_user, *roomsince)
+					.ready_filter_map(|e| extract_variant!(e, AnyRawAccountDataEvent::Room))
+					.collect()
+					.await,
+			);
+		}
+
+		let last_privateread_update = services
+			.rooms
+			.read_receipt
+			.last_privateread_update(sender_user, room_id)
+			.await > *roomsince;
+
+		let private_read_event = if last_privateread_update {
+			services
+				.rooms
+				.read_receipt
+				.private_read_get(room_id, sender_user)
+				.await
+				.ok()
+		} else {
+			None
+		};
+
+		let mut receipts: Vec<Raw<AnySyncEphemeralRoomEvent>> = services
+			.rooms
+			.read_receipt
+			.readreceipts_since(room_id, *roomsince)
+			.filter_map(|(read_user, _ts, v)| async move {
+				services
+					.users
+					.user_is_ignored(read_user, sender_user)
+					.await
+					.or_some(v)
+			})
+			.collect()
+			.await;
+
+		if let Some(private_read_event) = private_read_event {
+			receipts.push(private_read_event);
+		}
+
+		let receipt_size = receipts.len();
+
+		if receipt_size > 0 {
+			response
+				.extensions
+				.receipts
+				.rooms
+				.insert(room_id.clone(), pack_receipts(Box::new(receipts.into_iter())));
+		}
+
+		if roomsince != &0
+			&& timeline_pdus.is_empty()
+			&& response
+				.extensions
+				.account_data
+				.rooms
+				.get(room_id)
+				.is_none_or(Vec::is_empty)
+			&& receipt_size == 0
+		{
+			continue;
+		}
+
+		let prev_batch = timeline_pdus
+			.first()
+			.map_or(Ok::<_, Error>(None), |(pdu_count, _)| {
+				Ok(Some(match pdu_count {
+					| PduCount::Backfilled(_) => {
+						error!("timeline in backfill state?!");
+						"0".to_owned()
+					},
+					| PduCount::Normal(c) => c.to_string(),
+				}))
+			})?
+			.or_else(|| {
+				if roomsince != &0 {
+					Some(roomsince.to_string())
+				} else {
+					None
+				}
+			});
+
+		let room_events: Vec<_> = timeline_pdus
+			.iter()
+			.stream()
+			.filter_map(|item| ignored_filter(&services, item.clone(), sender_user))
+			.map(|(_, pdu)| pdu.to_sync_room_event())
+			.collect()
+			.await;
+
+		for (_, pdu) in timeline_pdus {
+			let ts = pdu.origin_server_ts;
+			if DEFAULT_BUMP_TYPES.binary_search(&pdu.kind).is_ok()
+				&& timestamp.is_none_or(|time| time <= ts)
+			{
+				timestamp = Some(ts);
+			}
+		}
+
+		let required_state = required_state_request
+			.iter()
+			.stream()
+			.filter_map(|state| async move {
+				services
+					.rooms
+					.state_accessor
+					.room_state_get(room_id, &state.0, &state.1)
+					.await
+					.map(|s| s.to_sync_state_event())
+					.ok()
+			})
+			.collect()
+			.await;
+
+		// Heroes
+		let heroes: Vec<_> = services
+			.rooms
+			.state_cache
+			.room_members(room_id)
+			.ready_filter(|member| *member != sender_user)
+			.filter_map(|user_id| {
+				services
+					.rooms
+					.state_accessor
+					.get_member(room_id, user_id)
+					.map_ok(|memberevent| sync_events::v5::response::Hero {
+						user_id: user_id.into(),
+						name: memberevent.displayname,
+						avatar: memberevent.avatar_url,
+					})
+					.ok()
+			})
+			.take(5)
+			.collect()
+			.await;
+
+		let name = match heroes.len().cmp(&(1_usize)) {
+			| Ordering::Greater => {
+				let firsts = heroes[1..]
+					.iter()
+					.map(|h| h.name.clone().unwrap_or_else(|| h.user_id.to_string()))
+					.collect::<Vec<_>>()
+					.join(", ");
+
+				let last = heroes[0]
+					.name
+					.clone()
+					.unwrap_or_else(|| heroes[0].user_id.to_string());
+
+				Some(format!("{firsts} and {last}"))
+			},
+			| Ordering::Equal => Some(
+				heroes[0]
+					.name
+					.clone()
+					.unwrap_or_else(|| heroes[0].user_id.to_string()),
+			),
+			| Ordering::Less => None,
+		};
+
+		let heroes_avatar = if heroes.len() == 1 {
+			heroes[0].avatar.clone()
+		} else {
+			None
+		};
+
+		rooms.insert(room_id.clone(), sync_events::v5::response::Room {
+			name: services
+				.rooms
+				.state_accessor
+				.get_name(room_id)
+				.await
+				.ok()
+				.or(name),
+			avatar: if let Some(heroes_avatar) = heroes_avatar {
+				ruma::JsOption::Some(heroes_avatar)
+			} else {
+				match services.rooms.state_accessor.get_avatar(room_id).await {
+					| ruma::JsOption::Some(avatar) => ruma::JsOption::from_option(avatar.url),
+					| ruma::JsOption::Null => ruma::JsOption::Null,
+					| ruma::JsOption::Undefined => ruma::JsOption::Undefined,
+				}
+			},
+			initial: Some(roomsince == &0),
+			is_dm: None,
+			invite_state,
+			unread_notifications: UnreadNotificationsCount {
+				highlight_count: Some(
+					services
+						.rooms
+						.user
+						.highlight_count(sender_user, room_id)
+						.await
+						.try_into()
+						.expect("notification count can't go that high"),
+				),
+				notification_count: Some(
+					services
+						.rooms
+						.user
+						.notification_count(sender_user, room_id)
+						.await
+						.try_into()
+						.expect("notification count can't go that high"),
+				),
+			},
+			timeline: room_events,
+			required_state,
+			prev_batch,
+			limited,
+			joined_count: Some(
+				services
+					.rooms
+					.state_cache
+					.room_joined_count(room_id)
+					.await
+					.unwrap_or(0)
+					.try_into()
+					.unwrap_or_else(|_| uint!(0)),
+			),
+			invited_count: Some(
+				services
+					.rooms
+					.state_cache
+					.room_invited_count(room_id)
+					.await
+					.unwrap_or(0)
+					.try_into()
+					.unwrap_or_else(|_| uint!(0)),
+			),
+			num_live: None, // Count events in timeline greater than global sync counter
+			bump_stamp: timestamp,
+			heroes: Some(heroes),
+		});
+	}
+	Ok(rooms)
+}
+async fn collect_account_data(
+	services: crate::State,
+	(sender_user, _, globalsince, body): (&UserId, &DeviceId, u64, &sync_events::v5::Request),
+) -> sync_events::v5::response::AccountData {
+	let mut account_data = sync_events::v5::response::AccountData {
+		global: Vec::new(),
+		rooms: BTreeMap::new(),
+	};
+
+	if !body.extensions.account_data.enabled.unwrap_or(false) {
+		return sync_events::v5::response::AccountData::default();
+	}
+
+	account_data.global = services
+		.account_data
+		.changes_since(None, sender_user, globalsince)
+		.ready_filter_map(|e| extract_variant!(e, AnyRawAccountDataEvent::Global))
+		.collect()
+		.await;
+
+	if let Some(rooms) = &body.extensions.account_data.rooms {
+		for room in rooms {
+			account_data.rooms.insert(
+				room.clone(),
+				services
+					.account_data
+					.changes_since(Some(room), sender_user, globalsince)
+					.ready_filter_map(|e| extract_variant!(e, AnyRawAccountDataEvent::Room))
+					.collect()
+					.await,
+			);
+		}
+	}
+
+	account_data
+}
+
+async fn collect_e2ee<'a>(
+	services: crate::State,
+	(sender_user, sender_device, globalsince, body): (
+		&UserId,
+		&DeviceId,
+		u64,
+		&sync_events::v5::Request,
+	),
+	all_joined_rooms: &'a Vec<&'a RoomId>,
+) -> Result<sync_events::v5::response::E2EE> {
+	if !body.extensions.e2ee.enabled.unwrap_or(false) {
+		return Ok(sync_events::v5::response::E2EE::default());
+	}
+	let mut left_encrypted_users = HashSet::new(); // Users that have left any encrypted rooms the sender was in
+	let mut device_list_changes = HashSet::new();
+	let mut device_list_left = HashSet::new();
+	// Look for device list updates of this account
+	device_list_changes.extend(
+		services
+			.users
+			.keys_changed(sender_user, globalsince, None)
+			.map(ToOwned::to_owned)
+			.collect::<Vec<_>>()
+			.await,
+	);
+
+	for room_id in all_joined_rooms {
+		let Ok(current_shortstatehash) =
+			services.rooms.state.get_room_shortstatehash(room_id).await
+		else {
+			error!("Room {room_id} has no state");
+			continue;
+		};
+
+		let since_shortstatehash = services
+			.rooms
+			.user
+			.get_token_shortstatehash(room_id, globalsince)
+			.await
+			.ok();
+
+		let encrypted_room = services
+			.rooms
+			.state_accessor
+			.state_get(current_shortstatehash, &StateEventType::RoomEncryption, "")
+			.await
+			.is_ok();
+
+		if let Some(since_shortstatehash) = since_shortstatehash {
+			// Skip if there are only timeline changes
+			if since_shortstatehash == current_shortstatehash {
+				continue;
+			}
+
+			let since_encryption = services
+				.rooms
+				.state_accessor
+				.state_get(since_shortstatehash, &StateEventType::RoomEncryption, "")
+				.await;
+
+			let since_sender_member: Option<RoomMemberEventContent> = services
+				.rooms
+				.state_accessor
+				.state_get_content(
+					since_shortstatehash,
+					&StateEventType::RoomMember,
+					sender_user.as_str(),
+				)
+				.ok()
+				.await;
+
+			let joined_since_last_sync = since_sender_member
+				.as_ref()
+				.is_none_or(|member| member.membership != MembershipState::Join);
+
+			let new_encrypted_room = encrypted_room && since_encryption.is_err();
+
+			if encrypted_room {
+				let current_state_ids: HashMap<_, OwnedEventId> = services
+					.rooms
+					.state_accessor
+					.state_full_ids(current_shortstatehash)
+					.await?;
+
+				let since_state_ids = services
+					.rooms
+					.state_accessor
+					.state_full_ids(since_shortstatehash)
+					.await?;
+
+				for (key, id) in current_state_ids {
+					if since_state_ids.get(&key) != Some(&id) {
+						let Ok(pdu) = services.rooms.timeline.get_pdu(&id).await else {
+							error!("Pdu in state not found: {id}");
+							continue;
+						};
+						if pdu.kind == TimelineEventType::RoomMember {
+							if let Some(state_key) = &pdu.state_key {
+								let user_id =
+									OwnedUserId::parse(state_key.clone()).map_err(|_| {
+										Error::bad_database("Invalid UserId in member PDU.")
+									})?;
+
+								if user_id == *sender_user {
+									continue;
+								}
+
+								let content: RoomMemberEventContent = pdu.get_content()?;
+								match content.membership {
+									| MembershipState::Join => {
+										// A new user joined an encrypted room
+										if !share_encrypted_room(
+											&services,
+											sender_user,
+											&user_id,
+											Some(room_id),
+										)
+										.await
+										{
+											device_list_changes.insert(user_id);
+										}
+									},
+									| MembershipState::Leave => {
+										// Write down users that have left encrypted rooms we
+										// are in
+										left_encrypted_users.insert(user_id);
+									},
+									| _ => {},
+								}
+							}
+						}
+					}
+				}
+				if joined_since_last_sync || new_encrypted_room {
+					// If the user is in a new encrypted room, give them all joined users
+					device_list_changes.extend(
+						services
+						.rooms
+						.state_cache
+						.room_members(room_id)
+						// Don't send key updates from the sender to the sender
+						.ready_filter(|user_id| sender_user != *user_id)
+						// Only send keys if the sender doesn't share an encrypted room with the target
+						// already
+						.filter_map(|user_id| {
+							share_encrypted_room(&services, sender_user, user_id, Some(room_id))
+								.map(|res| res.or_some(user_id.to_owned()))
+						})
+						.collect::<Vec<_>>()
+						.await,
+					);
+				}
+			}
+		}
+		// Look for device list updates in this room
+		device_list_changes.extend(
+			services
+				.users
+				.room_keys_changed(room_id, globalsince, None)
+				.map(|(user_id, _)| user_id)
+				.map(ToOwned::to_owned)
+				.collect::<Vec<_>>()
+				.await,
+		);
+	}
+
+	for user_id in left_encrypted_users {
+		let dont_share_encrypted_room =
+			!share_encrypted_room(&services, sender_user, &user_id, None).await;
+
+		// If the user doesn't share an encrypted room with the target anymore, we need
+		// to tell them
+		if dont_share_encrypted_room {
+			device_list_left.insert(user_id);
+		}
+	}
+
+	Ok(sync_events::v5::response::E2EE {
+		device_lists: DeviceLists {
+			changed: device_list_changes.into_iter().collect(),
+			left: device_list_left.into_iter().collect(),
+		},
+		device_one_time_keys_count: services
+			.users
+			.count_one_time_keys(sender_user, sender_device)
+			.await,
+		device_unused_fallback_key_types: None,
+	})
+}
+
+async fn collect_to_device(
+	services: crate::State,
+	(sender_user, sender_device, globalsince, body): SyncInfo<'_>,
+	next_batch: u64,
+) -> Option<sync_events::v5::response::ToDevice> {
+	if !body.extensions.to_device.enabled.unwrap_or(false) {
+		return None;
+	}
+
+	services
+		.users
+		.remove_to_device_events(sender_user, sender_device, globalsince)
+		.await;
+
+	Some(sync_events::v5::response::ToDevice {
+		next_batch: next_batch.to_string(),
+		events: services
+			.users
+			.get_to_device_events(sender_user, sender_device)
+			.collect()
+			.await,
+	})
+}
+
+async fn collect_receipts(_services: crate::State) -> sync_events::v5::response::Receipts {
+	sync_events::v5::response::Receipts { rooms: BTreeMap::new() }
+	// TODO: get explicitly requested read receipts
+}

src/api/client/unversioned.rs

@@ -52,6 +52,7 @@ pub(crate) async fn get_supported_versions_route(
 			("org.matrix.msc4180".to_owned(), true), /* stable flag for 3916 (https://github.com/matrix-org/matrix-spec-proposals/pull/4180) */
 			("uk.tcpip.msc4133".to_owned(), true), /* Extending User Profile API with Key:Value Pairs (https://github.com/matrix-org/matrix-spec-proposals/pull/4133) */
 			("us.cloke.msc4175".to_owned(), true), /* Profile field for user time zone (https://github.com/matrix-org/matrix-spec-proposals/pull/4175) */
+			("org.matrix.simplified_msc3575".to_owned(), true), /* Simplified Sliding sync (https://github.com/matrix-org/matrix-spec-proposals/pull/4186) */
 		]),
 	};
 

src/api/router.rs

@@ -145,6 +145,7 @@ pub fn build(router: Router<State>, server: &Server) -> Router<State> {
 		)
 		.ruma_route(&client::sync_events_route)
 		.ruma_route(&client::sync_events_v4_route)
+		.ruma_route(&client::sync_events_v5_route)
 		.ruma_route(&client::get_context_route)
 		.ruma_route(&client::get_message_events_route)
 		.ruma_route(&client::search_events_route)

src/service/rooms/read_receipt/mod.rs

@@ -155,6 +155,7 @@ where
 	}
 	let content = ReceiptEventContent::from_iter(json);
 
+	conduwuit::trace!(?content);
 	Raw::from_json(
 		serde_json::value::to_raw_value(&SyncEphemeralRoomEvent { content })
 			.expect("received valid json"),

src/service/sync/mod.rs

@@ -11,8 +11,9 @@ use ruma::{
 	api::client::sync::sync_events::{
 		self,
 		v4::{ExtensionsConfig, SyncRequestList},
+		v5,
 	},
-	OwnedDeviceId, OwnedRoomId, OwnedUserId,
+	DeviceId, OwnedDeviceId, OwnedRoomId, OwnedUserId, UserId,
 };
 
 use crate::{rooms, Dep};
@@ -20,7 +21,8 @@ use crate::{rooms, Dep};
 pub struct Service {
 	db: Data,
 	services: Services,
-	connections: DbConnections,
+	connections: DbConnections<DbConnectionsKey, DbConnectionsVal>,
+	snake_connections: DbConnections<SnakeConnectionsKey, SnakeConnectionsVal>,
 }
 
 pub struct Data {
@@ -52,9 +54,19 @@ struct SlidingSyncCache {
 	extensions: ExtensionsConfig,
 }
 
-type DbConnections = Mutex<BTreeMap<DbConnectionsKey, DbConnectionsVal>>;
+#[derive(Default)]
+struct SnakeSyncCache {
+	lists: BTreeMap<String, v5::request::List>,
+	subscriptions: BTreeMap<OwnedRoomId, v5::request::RoomSubscription>,
+	known_rooms: BTreeMap<String, BTreeMap<OwnedRoomId, u64>>,
+	extensions: v5::request::Extensions,
+}
+
+type DbConnections<K, V> = Mutex<BTreeMap<K, V>>;
 type DbConnectionsKey = (OwnedUserId, OwnedDeviceId, String);
 type DbConnectionsVal = Arc<Mutex<SlidingSyncCache>>;
+type SnakeConnectionsKey = (OwnedUserId, OwnedDeviceId, Option<String>);
+type SnakeConnectionsVal = Arc<Mutex<SnakeSyncCache>>;
 
 impl crate::Service for Service {
 	fn build(args: crate::Args<'_>) -> Result<Arc<Self>> {
@@ -79,12 +91,15 @@ impl crate::Service for Service {
 				typing: args.depend::<rooms::typing::Service>("rooms::typing"),
 			},
 			connections: StdMutex::new(BTreeMap::new()),
+			snake_connections: StdMutex::new(BTreeMap::new()),
 		}))
 	}
 
 	fn name(&self) -> &str { crate::service::make_name(std::module_path!()) }
 }
 
+/// load params from cache if body doesn't contain it, as long as it's allowed
+/// in some cases we may need to allow an empty list as an actual value
 fn list_or_sticky<T: Clone>(target: &mut Vec<T>, cached: &Vec<T>) {
 	if target.is_empty() {
 		target.clone_from(cached);
@@ -97,6 +112,30 @@ fn some_or_sticky<T>(target: &mut Option<T>, cached: Option<T>) {
 }
 
 impl Service {
+	pub fn snake_connection_cached(
+		&self,
+		user_id: OwnedUserId,
+		device_id: OwnedDeviceId,
+		conn_id: Option<String>,
+	) -> bool {
+		self.snake_connections
+			.lock()
+			.unwrap()
+			.contains_key(&(user_id, device_id, conn_id))
+	}
+
+	pub fn forget_snake_sync_connection(
+		&self,
+		user_id: OwnedUserId,
+		device_id: OwnedDeviceId,
+		conn_id: Option<String>,
+	) {
+		self.snake_connections
+			.lock()
+			.expect("locked")
+			.remove(&(user_id, device_id, conn_id));
+	}
+
 	pub fn remembered(
 		&self,
 		user_id: OwnedUserId,
@@ -121,6 +160,112 @@ impl Service {
 			.remove(&(user_id, device_id, conn_id));
 	}
 
+	pub fn update_snake_sync_request_with_cache(
+		&self,
+		user_id: OwnedUserId,
+		device_id: OwnedDeviceId,
+		request: &mut v5::Request,
+	) -> BTreeMap<String, BTreeMap<OwnedRoomId, u64>> {
+		let conn_id = request.conn_id.clone();
+		let mut cache = self.snake_connections.lock().expect("locked");
+		let cached = Arc::clone(
+			cache
+				.entry((user_id, device_id, conn_id))
+				.or_insert_with(|| Arc::new(Mutex::new(SnakeSyncCache::default()))),
+		);
+		let cached = &mut cached.lock().expect("locked");
+		drop(cache);
+
+		//v5::Request::try_from_http_request(req, path_args);
+		for (list_id, list) in &mut request.lists {
+			if let Some(cached_list) = cached.lists.get(list_id) {
+				list_or_sticky(
+					&mut list.room_details.required_state,
+					&cached_list.room_details.required_state,
+				);
+				some_or_sticky(&mut list.include_heroes, cached_list.include_heroes);
+
+				match (&mut list.filters, cached_list.filters.clone()) {
+					| (Some(filters), Some(cached_filters)) => {
+						some_or_sticky(&mut filters.is_invite, cached_filters.is_invite);
+						// TODO (morguldir): Find out how a client can unset this, probably need
+						// to change into an option inside ruma
+						list_or_sticky(
+							&mut filters.not_room_types,
+							&cached_filters.not_room_types,
+						);
+					},
+					| (_, Some(cached_filters)) => list.filters = Some(cached_filters),
+					| (Some(list_filters), _) => list.filters = Some(list_filters.clone()),
+					| (..) => {},
+				}
+			}
+			cached.lists.insert(list_id.clone(), list.clone());
+		}
+
+		cached
+			.subscriptions
+			.extend(request.room_subscriptions.clone());
+		request
+			.room_subscriptions
+			.extend(cached.subscriptions.clone());
+
+		request.extensions.e2ee.enabled = request
+			.extensions
+			.e2ee
+			.enabled
+			.or(cached.extensions.e2ee.enabled);
+
+		request.extensions.to_device.enabled = request
+			.extensions
+			.to_device
+			.enabled
+			.or(cached.extensions.to_device.enabled);
+
+		request.extensions.account_data.enabled = request
+			.extensions
+			.account_data
+			.enabled
+			.or(cached.extensions.account_data.enabled);
+		request.extensions.account_data.lists = request
+			.extensions
+			.account_data
+			.lists
+			.clone()
+			.or_else(|| cached.extensions.account_data.lists.clone());
+		request.extensions.account_data.rooms = request
+			.extensions
+			.account_data
+			.rooms
+			.clone()
+			.or_else(|| cached.extensions.account_data.rooms.clone());
+
+		some_or_sticky(&mut request.extensions.typing.enabled, cached.extensions.typing.enabled);
+		some_or_sticky(
+			&mut request.extensions.typing.rooms,
+			cached.extensions.typing.rooms.clone(),
+		);
+		some_or_sticky(
+			&mut request.extensions.typing.lists,
+			cached.extensions.typing.lists.clone(),
+		);
+		some_or_sticky(
+			&mut request.extensions.receipts.enabled,
+			cached.extensions.receipts.enabled,
+		);
+		some_or_sticky(
+			&mut request.extensions.receipts.rooms,
+			cached.extensions.receipts.rooms.clone(),
+		);
+		some_or_sticky(
+			&mut request.extensions.receipts.lists,
+			cached.extensions.receipts.lists.clone(),
+		);
+
+		cached.extensions = request.extensions.clone();
+		cached.known_rooms.clone()
+	}
+
 	pub fn update_sync_request_with_cache(
 		&self,
 		user_id: OwnedUserId,
@@ -148,20 +293,30 @@ impl Service {
 		for (list_id, list) in &mut request.lists {
 			if let Some(cached_list) = cached.lists.get(list_id) {
 				list_or_sticky(&mut list.sort, &cached_list.sort);
-				list_or_sticky(&mut list.room_details.required_state, &cached_list.room_details.required_state);
-				some_or_sticky(&mut list.room_details.timeline_limit, cached_list.room_details.timeline_limit);
-				some_or_sticky(&mut list.include_old_rooms, cached_list.include_old_rooms.clone());
+				list_or_sticky(
+					&mut list.room_details.required_state,
+					&cached_list.room_details.required_state,
+				);
+				some_or_sticky(
+					&mut list.room_details.timeline_limit,
+					cached_list.room_details.timeline_limit,
+				);
+				some_or_sticky(
+					&mut list.include_old_rooms,
+					cached_list.include_old_rooms.clone(),
+				);
 				match (&mut list.filters, cached_list.filters.clone()) {
-					(Some(list_filters), Some(cached_filters)) => {
-						some_or_sticky(&mut list_filters.is_dm, cached_filters.is_dm);
-						list_or_sticky(&mut list_filters.spaces, &cached_filters.spaces);
-						some_or_sticky(&mut list_filters.is_encrypted, cached_filters.is_encrypted);
-						some_or_sticky(&mut list_filters.is_invite, cached_filters.is_invite);
-						list_or_sticky(&mut list_filters.room_types, &cached_filters.room_types);
-						list_or_sticky(&mut list_filters.not_room_types, &cached_filters.not_room_types);
-						some_or_sticky(&mut list_filters.room_name_like, cached_filters.room_name_like);
-						list_or_sticky(&mut list_filters.tags, &cached_filters.tags);
-						list_or_sticky(&mut list_filters.not_tags, &cached_filters.not_tags);
+					| (Some(filter), Some(cached_filter)) => {
+						some_or_sticky(&mut filter.is_dm, cached_filter.is_dm);
+						list_or_sticky(&mut filter.spaces, &cached_filter.spaces);
+						some_or_sticky(&mut filter.is_encrypted, cached_filter.is_encrypted);
+						some_or_sticky(&mut filter.is_invite, cached_filter.is_invite);
+						list_or_sticky(&mut filter.room_types, &cached_filter.room_types);
+						// Should be made possible to change
+						list_or_sticky(&mut filter.not_room_types, &cached_filter.not_room_types);
+						some_or_sticky(&mut filter.room_name_like, cached_filter.room_name_like);
+						list_or_sticky(&mut filter.tags, &cached_filter.tags);
+						list_or_sticky(&mut filter.not_tags, &cached_filter.not_tags);
 					},
 					| (_, Some(cached_filters)) => list.filters = Some(cached_filters),
 					| (Some(list_filters), _) => list.filters = Some(list_filters.clone()),
@@ -222,18 +377,16 @@ impl Service {
 		subscriptions: BTreeMap<OwnedRoomId, sync_events::v4::RoomSubscription>,
 	) {
 		let mut cache = self.connections.lock().expect("locked");
-		let cached = Arc::clone(
-			cache
-				.entry((user_id, device_id, conn_id))
-				.or_insert_with(|| {
+		let cached = Arc::clone(cache.entry((user_id, device_id, conn_id)).or_insert_with(
+			|| {
 				Arc::new(Mutex::new(SlidingSyncCache {
 					lists: BTreeMap::new(),
 					subscriptions: BTreeMap::new(),
 					known_rooms: BTreeMap::new(),
 					extensions: ExtensionsConfig::default(),
 				}))
-				}),
-		);
+			},
+		));
 		let cached = &mut cached.lock().expect("locked");
 		drop(cache);
 
@@ -241,13 +394,18 @@ impl Service {
 	}
 
 	pub fn update_sync_known_rooms(
-		&self, user_id: OwnedUserId, device_id: OwnedDeviceId, conn_id: String, list_id: String,
-		new_cached_rooms: BTreeSet<OwnedRoomId>, globalsince: u64,
+		&self,
+		user_id: &UserId,
+		device_id: &DeviceId,
+		conn_id: String,
+		list_id: String,
+		new_cached_rooms: BTreeSet<OwnedRoomId>,
+		globalsince: u64,
 	) {
 		let mut cache = self.connections.lock().expect("locked");
 		let cached = Arc::clone(
 			cache
-				.entry((user_id, device_id, conn_id))
+				.entry((user_id.to_owned(), device_id.to_owned(), conn_id))
 				.or_insert_with(|| {
 					Arc::new(Mutex::new(SlidingSyncCache {
 						lists: BTreeMap::new(),
@@ -275,4 +433,57 @@ impl Service {
 			list.insert(roomid, globalsince);
 		}
 	}
+
+	pub fn update_snake_sync_known_rooms(
+		&self,
+		user_id: &UserId,
+		device_id: &DeviceId,
+		conn_id: String,
+		list_id: String,
+		new_cached_rooms: BTreeSet<OwnedRoomId>,
+		globalsince: u64,
+	) {
+		let mut cache = self.snake_connections.lock().expect("locked");
+		let cached = Arc::clone(
+			cache
+				.entry((user_id.to_owned(), device_id.to_owned(), Some(conn_id)))
+				.or_insert_with(|| Arc::new(Mutex::new(SnakeSyncCache::default()))),
+		);
+		let cached = &mut cached.lock().expect("locked");
+		drop(cache);
+
+		for (roomid, lastsince) in cached
+			.known_rooms
+			.entry(list_id.clone())
+			.or_default()
+			.iter_mut()
+		{
+			if !new_cached_rooms.contains(roomid) {
+				*lastsince = 0;
+			}
+		}
+		let list = cached.known_rooms.entry(list_id).or_default();
+		for roomid in new_cached_rooms {
+			list.insert(roomid, globalsince);
+		}
+	}
+
+	pub fn update_snake_sync_subscriptions(
+		&self,
+		user_id: OwnedUserId,
+		device_id: OwnedDeviceId,
+		conn_id: Option<String>,
+		subscriptions: BTreeMap<OwnedRoomId, v5::request::RoomSubscription>,
+	) {
+		let mut cache = self.snake_connections.lock().expect("locked");
+		let cached = Arc::clone(
+			cache
+				.entry((user_id, device_id, conn_id))
+				.or_insert_with(|| Arc::new(Mutex::new(SnakeSyncCache::default()))),
+		);
+		let cached = &mut cached.lock().expect("locked");
+		drop(cache);
+
+		cached.subscriptions = subscriptions;
+	}
 }