Cleanup/optimize sliding sync types and arguments.

Signed-off-by: Jason Volk <jason@zemos.net>
2025-10-06 01:12:01 +00:00
parent b1ea7b101d
commit 6c724bbc2f
10 changed files with 436 additions and 392 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3509,7 +3509,7 @@ dependencies = [
 [[package]]
 name = "ruma"
 version = "0.13.0"
-source = "git+https://github.com/matrix-construct/ruma?rev=07fee6a5db8c1523399a2463fd8a1c50a04da759#07fee6a5db8c1523399a2463fd8a1c50a04da759"
+source = "git+https://github.com/matrix-construct/ruma?rev=e03efd9d228be89365ae0399e2178d0ffa3dc42f#e03efd9d228be89365ae0399e2178d0ffa3dc42f"
 dependencies = [
 "assign",
 "js_int",
@@ -3528,7 +3528,7 @@ dependencies = [
 [[package]]
 name = "ruma-appservice-api"
 version = "0.13.0"
-source = "git+https://github.com/matrix-construct/ruma?rev=07fee6a5db8c1523399a2463fd8a1c50a04da759#07fee6a5db8c1523399a2463fd8a1c50a04da759"
+source = "git+https://github.com/matrix-construct/ruma?rev=e03efd9d228be89365ae0399e2178d0ffa3dc42f#e03efd9d228be89365ae0399e2178d0ffa3dc42f"
 dependencies = [
 "js_int",
 "ruma-common",
@@ -3540,7 +3540,7 @@ dependencies = [
 [[package]]
 name = "ruma-client-api"
 version = "0.21.0"
-source = "git+https://github.com/matrix-construct/ruma?rev=07fee6a5db8c1523399a2463fd8a1c50a04da759#07fee6a5db8c1523399a2463fd8a1c50a04da759"
+source = "git+https://github.com/matrix-construct/ruma?rev=e03efd9d228be89365ae0399e2178d0ffa3dc42f#e03efd9d228be89365ae0399e2178d0ffa3dc42f"
 dependencies = [
 "as_variant",
 "assign",
@@ -3555,6 +3555,7 @@ dependencies = [
 "serde",
 "serde_html_form",
 "serde_json",
+ "smallstr",
 "thiserror 2.0.16",
 "url",
 "web-time",
@@ -3563,7 +3564,7 @@ dependencies = [
 [[package]]
 name = "ruma-common"
 version = "0.16.0"
-source = "git+https://github.com/matrix-construct/ruma?rev=07fee6a5db8c1523399a2463fd8a1c50a04da759#07fee6a5db8c1523399a2463fd8a1c50a04da759"
+source = "git+https://github.com/matrix-construct/ruma?rev=e03efd9d228be89365ae0399e2178d0ffa3dc42f#e03efd9d228be89365ae0399e2178d0ffa3dc42f"
 dependencies = [
 "as_variant",
 "base64",
@@ -3596,7 +3597,7 @@ dependencies = [
 [[package]]
 name = "ruma-events"
 version = "0.31.0"
-source = "git+https://github.com/matrix-construct/ruma?rev=07fee6a5db8c1523399a2463fd8a1c50a04da759#07fee6a5db8c1523399a2463fd8a1c50a04da759"
+source = "git+https://github.com/matrix-construct/ruma?rev=e03efd9d228be89365ae0399e2178d0ffa3dc42f#e03efd9d228be89365ae0399e2178d0ffa3dc42f"
 dependencies = [
 "as_variant",
 "indexmap",
@@ -3622,7 +3623,7 @@ dependencies = [
 [[package]]
 name = "ruma-federation-api"
 version = "0.12.0"
-source = "git+https://github.com/matrix-construct/ruma?rev=07fee6a5db8c1523399a2463fd8a1c50a04da759#07fee6a5db8c1523399a2463fd8a1c50a04da759"
+source = "git+https://github.com/matrix-construct/ruma?rev=e03efd9d228be89365ae0399e2178d0ffa3dc42f#e03efd9d228be89365ae0399e2178d0ffa3dc42f"
 dependencies = [
 "bytes",
 "headers",
@@ -3644,7 +3645,7 @@ dependencies = [
 [[package]]
 name = "ruma-identifiers-validation"
 version = "0.11.0"
-source = "git+https://github.com/matrix-construct/ruma?rev=07fee6a5db8c1523399a2463fd8a1c50a04da759#07fee6a5db8c1523399a2463fd8a1c50a04da759"
+source = "git+https://github.com/matrix-construct/ruma?rev=e03efd9d228be89365ae0399e2178d0ffa3dc42f#e03efd9d228be89365ae0399e2178d0ffa3dc42f"
 dependencies = [
 "js_int",
 "thiserror 2.0.16",
@@ -3653,7 +3654,7 @@ dependencies = [
 [[package]]
 name = "ruma-macros"
 version = "0.16.0"
-source = "git+https://github.com/matrix-construct/ruma?rev=07fee6a5db8c1523399a2463fd8a1c50a04da759#07fee6a5db8c1523399a2463fd8a1c50a04da759"
+source = "git+https://github.com/matrix-construct/ruma?rev=e03efd9d228be89365ae0399e2178d0ffa3dc42f#e03efd9d228be89365ae0399e2178d0ffa3dc42f"
 dependencies = [
 "cfg-if",
 "proc-macro-crate",
@@ -3668,7 +3669,7 @@ dependencies = [
 [[package]]
 name = "ruma-push-gateway-api"
 version = "0.12.0"
-source = "git+https://github.com/matrix-construct/ruma?rev=07fee6a5db8c1523399a2463fd8a1c50a04da759#07fee6a5db8c1523399a2463fd8a1c50a04da759"
+source = "git+https://github.com/matrix-construct/ruma?rev=e03efd9d228be89365ae0399e2178d0ffa3dc42f#e03efd9d228be89365ae0399e2178d0ffa3dc42f"
 dependencies = [
 "js_int",
 "ruma-common",
@@ -3680,7 +3681,7 @@ dependencies = [
 [[package]]
 name = "ruma-signatures"
 version = "0.18.0"
-source = "git+https://github.com/matrix-construct/ruma?rev=07fee6a5db8c1523399a2463fd8a1c50a04da759#07fee6a5db8c1523399a2463fd8a1c50a04da759"
+source = "git+https://github.com/matrix-construct/ruma?rev=e03efd9d228be89365ae0399e2178d0ffa3dc42f#e03efd9d228be89365ae0399e2178d0ffa3dc42f"
 dependencies = [
 "base64",
 "ed25519-dalek",
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -320,7 +320,7 @@ default-features = false

 [workspace.dependencies.ruma]
 git = "https://github.com/matrix-construct/ruma"
-rev = "07fee6a5db8c1523399a2463fd8a1c50a04da759"
+rev = "e03efd9d228be89365ae0399e2178d0ffa3dc42f"
 features = [
    "__compat",
    "appservice-api-c",
--- a/src/api/client/sync/v5.rs
+++ b/src/api/client/sync/v5.rs
@@ -15,7 +15,7 @@ use std::{
 use axum::extract::State;
 use futures::{
 	FutureExt, Stream, StreamExt, TryFutureExt, TryStreamExt,
-	future::{OptionFuture, join4, join5, try_join},
+	future::{OptionFuture, join, join3, join5, try_join},
 	pin_mut,
 };
 use ruma::{
@@ -24,6 +24,7 @@ use ruma::{
 		Request, Response, request::ExtensionRoomConfig, response,
 	},
 	directory::RoomTypeFilter,
+	events::room::member::MembershipState,
 	uint,
 };
 use tokio::time::{Instant, timeout_at};
@@ -44,16 +45,29 @@ use tuwunel_core::{
 };
 use tuwunel_service::{
 	Services,
-	sync::{KnownRooms, into_snake_key},
+	sync::{KnownRooms, ListId, into_connection_key},
 };

 use super::share_encrypted_room;
 use crate::{Ruma, client::DEFAULT_BUMP_TYPES};

-type SyncInfo<'a> = (&'a UserId, &'a DeviceId, u64, &'a Request);
+#[derive(Copy, Clone)]
+struct SyncInfo<'a> {
+	sender_user: &'a UserId,
+	sender_device: &'a DeviceId,
+	request: &'a Request,
+	globalsince: u64,
+}
+
+struct TodoRoom {
+	membership: MembershipState,
+	requested_state: BTreeSet<TypeStateKey>,
+	timeline_limit: usize,
+	roomsince: u64,
+}
+
 type TodoRooms = BTreeMap<OwnedRoomId, TodoRoom>;
-type TodoRoom = (BTreeSet<TypeStateKey>, usize, u64);
-type ResponseLists = BTreeMap<String, response::List>;
+type ResponseLists = BTreeMap<ListId, response::List>;

 /// `POST /_matrix/client/unstable/org.matrix.simplified_msc3575/sync`
 /// ([MSC4186])
@@ -88,8 +102,9 @@ pub(crate) async fn sync_events_v5_route(
 		.unwrap_or(0);

 	let (sender_user, sender_device) = body.sender();
-	let snake_key = into_snake_key(sender_user, sender_device, request.conn_id.as_deref());
-	if globalsince != 0 && !services.sync.snake_connection_cached(&snake_key) {
+	let conn_key = into_connection_key(sender_user, sender_device, request.conn_id.as_deref());
+
+	if globalsince != 0 && !services.sync.is_connection_cached(&conn_key) {
 		return Err!(Request(UnknownPos(
 			"Connection data unknown to server; restarting sync stream."
 		)));
@@ -97,15 +112,22 @@ pub(crate) async fn sync_events_v5_route(

 	// Client / User requested an initial sync
 	if globalsince == 0 {
-		services
-			.sync
-			.forget_snake_sync_connection(&snake_key);
+		services.sync.forget_connection(&conn_key);
 	}

 	// Get sticky parameters from cache
 	let known_rooms = services
 		.sync
-		.update_snake_sync_request_with_cache(&snake_key, &mut request);
+		.update_cache(&conn_key, &mut request);
+
+	let sync_info = SyncInfo {
+		sender_user,
+		sender_device,
+		globalsince,
+		request: &request,
+	};
+
+	let lists = handle_lists(services, sync_info, known_rooms);

 	let ping_presence = services
 		.presence
@@ -113,45 +135,7 @@ pub(crate) async fn sync_events_v5_route(
 		.inspect_err(inspect_log)
 		.ok();

-	let all_joined_rooms = services
-		.state_cache
-		.rooms_joined(sender_user)
-		.map(ToOwned::to_owned)
-		.collect::<Vec<OwnedRoomId>>();
-
-	let all_invited_rooms = services
-		.state_cache
-		.rooms_invited(sender_user)
-		.map(ToOwned::to_owned)
-		.collect::<Vec<OwnedRoomId>>();
-
-	let all_knocked_rooms = services
-		.state_cache
-		.rooms_knocked(sender_user)
-		.map(ToOwned::to_owned)
-		.collect::<Vec<OwnedRoomId>>();
-
-	let (all_joined_rooms, all_invited_rooms, all_knocked_rooms, _) =
-		join4(all_joined_rooms, all_invited_rooms, all_knocked_rooms, ping_presence).await;
-
-	let all_invited_rooms = all_invited_rooms.iter().map(AsRef::as_ref);
-	let all_knocked_rooms = all_knocked_rooms.iter().map(AsRef::as_ref);
-	let all_joined_rooms = all_joined_rooms.iter().map(AsRef::as_ref);
-	let all_rooms = all_joined_rooms
-		.clone()
-		.chain(all_invited_rooms.clone())
-		.chain(all_knocked_rooms.clone());
-
-	let sync_info: SyncInfo<'_> = (sender_user, sender_device, globalsince, &request);
-	let (known_rooms, todo_rooms, lists) = handle_lists(
-		services,
-		sync_info,
-		known_rooms,
-		all_invited_rooms.clone(),
-		all_joined_rooms.clone(),
-		all_rooms.clone(),
-	)
-	.await;
+	let ((known_rooms, todo_rooms, lists), _) = join(lists, ping_presence).await;

 	let timeout = request
 		.timeout
@@ -170,7 +154,7 @@ pub(crate) async fn sync_events_v5_route(
 	let mut response = Response {
 		txn_id: request.txn_id.clone(),
 		lists,
-		pos: String::new(),
+		pos: Default::default(),
 		rooms: Default::default(),
 		extensions: Default::default(),
 	};
@@ -181,15 +165,8 @@ pub(crate) async fn sync_events_v5_route(

 		debug_assert!(globalsince <= next_batch, "next_batch is monotonic");
 		if globalsince < next_batch {
-			let rooms = handle_rooms(
-				services,
-				&sync_info,
-				next_batch,
-				&known_rooms,
-				&todo_rooms,
-				all_invited_rooms.clone(),
-			)
-			.map_ok(|rooms| response.rooms = rooms);
+			let rooms = handle_rooms(services, sync_info, next_batch, &todo_rooms)
+				.map_ok(|rooms| response.rooms = rooms);

 			let extensions =
 				handle_extensions(services, sync_info, next_batch, &known_rooms, &todo_rooms)
@@ -199,14 +176,14 @@ pub(crate) async fn sync_events_v5_route(

 			if !is_empty_response(&response) {
 				trace!(globalsince, next_batch, "response {response:?}");
-				response.pos = next_batch.to_string();
+				response.pos = next_batch.to_string().into();
 				return Ok(response);
 			}
 		}

 		if timeout_at(stop_at, watchers).await.is_err() {
 			trace!(globalsince, next_batch, "timeout; empty response");
-			response.pos = next_batch.to_string();
+			response.pos = next_batch.to_string().into();
 			return Ok(response);
 		}

@@ -234,26 +211,50 @@ fn is_empty_response(response: &Response) -> bool {
    level = "debug",
    skip_all,
    fields(
-        all_invited_rooms = all_invited_rooms.clone().count(),
-        all_joined_rooms = all_joined_rooms.clone().count(),
-        all_rooms = all_rooms.clone().count(),
        known_rooms = known_rooms.len(),
    )
 )]
 #[allow(clippy::too_many_arguments)]
-async fn handle_lists<'a, Rooms, AllRooms>(
+async fn handle_lists(
 	services: &Services,
 	sync_info: SyncInfo<'_>,
 	known_rooms: KnownRooms,
-	all_invited_rooms: Rooms,
-	all_joined_rooms: Rooms,
-	all_rooms: AllRooms,
-) -> (KnownRooms, TodoRooms, ResponseLists)
-where
-	Rooms: Iterator<Item = &'a RoomId> + Clone + Send + 'a,
-	AllRooms: Iterator<Item = &'a RoomId> + Clone + Send + 'a,
-{
-	let &(sender_user, sender_device, globalsince, request) = &sync_info;
+) -> (KnownRooms, TodoRooms, ResponseLists) {
+	let &SyncInfo {
+		sender_user,
+		sender_device,
+		request,
+		globalsince,
+	} = &sync_info;
+
+	let all_joined_rooms = services
+		.state_cache
+		.rooms_joined(sender_user)
+		.map(ToOwned::to_owned)
+		.collect::<Vec<OwnedRoomId>>();
+
+	let all_invited_rooms = services
+		.state_cache
+		.rooms_invited(sender_user)
+		.map(ToOwned::to_owned)
+		.collect::<Vec<OwnedRoomId>>();
+
+	let all_knocked_rooms = services
+		.state_cache
+		.rooms_knocked(sender_user)
+		.map(ToOwned::to_owned)
+		.collect::<Vec<OwnedRoomId>>();
+
+	let (all_joined_rooms, all_invited_rooms, all_knocked_rooms) =
+		join3(all_joined_rooms, all_invited_rooms, all_knocked_rooms).await;
+
+	let all_invited_rooms = all_invited_rooms.iter().map(AsRef::as_ref);
+	let all_knocked_rooms = all_knocked_rooms.iter().map(AsRef::as_ref);
+	let all_joined_rooms = all_joined_rooms.iter().map(AsRef::as_ref);
+	let all_rooms = all_joined_rooms
+		.clone()
+		.chain(all_invited_rooms.clone())
+		.chain(all_knocked_rooms.clone());

 	let mut todo_rooms: TodoRooms = BTreeMap::new();
 	let mut response_lists = ResponseLists::new();
@@ -298,13 +299,25 @@ where

 			new_known_rooms.extend(new_rooms);
 			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 todo_room = todo_rooms
+					.entry(room_id.to_owned())
+					.or_insert(TodoRoom {
+						membership: MembershipState::Join,
+						requested_state: BTreeSet::new(),
+						timeline_limit: 0_usize,
+						roomsince: u64::MAX,
+					});

-				todo_room.0.extend(
+				todo_room.membership = if all_invited_rooms
+					.clone()
+					.any(is_equal_to!(room_id))
+				{
+					MembershipState::Invite
+				} else {
+					MembershipState::Join
+				};
+
+				todo_room.requested_state.extend(
 					list.room_details
 						.required_state
 						.iter()
@@ -312,10 +325,10 @@ where
 				);

 				let limit: usize = usize_from_ruma(list.room_details.timeline_limit).min(100);
-				todo_room.1 = todo_room.1.max(limit);
+				todo_room.timeline_limit = todo_room.timeline_limit.max(limit);

 				// 0 means unknown because it got out of date
-				todo_room.2 = todo_room.2.min(
+				todo_room.roomsince = todo_room.roomsince.min(
 					known_rooms
 						.get(list_id.as_str())
 						.and_then(|k| k.get(room_id))
@@ -326,14 +339,11 @@ where
 		}

 		if let Some(conn_id) = request.conn_id.as_deref() {
-			let snake_key = into_snake_key(sender_user, sender_device, conn_id.into());
+			let conn_key = into_connection_key(sender_user, sender_device, conn_id.into());
 			let list_id = list_id.as_str().into();
-			services.sync.update_snake_sync_known_rooms(
-				&snake_key,
-				list_id,
-				new_known_rooms,
-				globalsince,
-			);
+			services
+				.sync
+				.update_known_rooms(&conn_key, list_id, new_known_rooms, globalsince);
 		}

 		response_lists.insert(list_id.clone(), response::List {
@@ -358,7 +368,12 @@ where
 )]
 async fn fetch_subscriptions(
 	services: &Services,
-	(sender_user, sender_device, globalsince, request): SyncInfo<'_>,
+	SyncInfo {
+		sender_user,
+		sender_device,
+		globalsince,
+		request,
+	}: SyncInfo<'_>,
 	known_rooms: KnownRooms,
 	todo_rooms: TodoRooms,
 ) -> (KnownRooms, TodoRooms) {
@@ -381,22 +396,28 @@ async fn fetch_subscriptions(
 				.then_some((room_id, room))
 		})
 		.ready_fold(subs, |(mut todo_rooms, mut known_subs), (room_id, room)| {
-			let todo_room =
-				todo_rooms
-					.entry(room_id.clone())
-					.or_insert((BTreeSet::new(), 0_usize, u64::MAX));
+			let todo_room = todo_rooms
+				.entry(room_id.clone())
+				.or_insert(TodoRoom {
+					membership: MembershipState::Join,
+					requested_state: BTreeSet::new(),
+					timeline_limit: 0_usize,
+					roomsince: u64::MAX,
+				});

-			todo_room.0.extend(
+			todo_room.requested_state.extend(
 				room.required_state
 					.iter()
 					.map(|(ty, sk)| (ty.clone(), sk.as_str().into())),
 			);

 			let limit: UInt = room.timeline_limit;
-			todo_room.1 = todo_room.1.max(usize_from_ruma(limit));
+			todo_room.timeline_limit = todo_room
+				.timeline_limit
+				.max(usize_from_ruma(limit));

 			// 0 means unknown because it got out of date
-			todo_room.2 = todo_room.2.min(
+			todo_room.roomsince = todo_room.roomsince.min(
 				known_rooms
 					.get("subscriptions")
 					.and_then(|k| k.get(room_id))
@@ -410,11 +431,11 @@ async fn fetch_subscriptions(
 		.await;

 	if let Some(conn_id) = request.conn_id.as_deref() {
-		let snake_key = into_snake_key(sender_user, sender_device, conn_id.into());
+		let conn_key = into_connection_key(sender_user, sender_device, conn_id.into());
 		let list_id = "subscriptions".into();
 		services
 			.sync
-			.update_snake_sync_known_rooms(&snake_key, list_id, known_subs, globalsince);
+			.update_known_rooms(&conn_key, list_id, known_subs, globalsince);
 	}

 	(known_rooms, todo_rooms)
@@ -461,32 +482,20 @@ where
    skip_all,
    fields(
        next_batch,
-        all_invited_rooms = all_invited_rooms.clone().count(),
        todo_rooms = todo_rooms.len(),
    )
 )]
-async fn handle_rooms<'a, Rooms>(
+async fn handle_rooms(
 	services: &Services,
-	sync_info: &SyncInfo<'_>,
+	sync_info: SyncInfo<'_>,
 	next_batch: u64,
-	_known_rooms: &KnownRooms,
 	todo_rooms: &TodoRooms,
-	all_invited_rooms: Rooms,
-) -> Result<BTreeMap<OwnedRoomId, response::Room>>
-where
-	Rooms: Iterator<Item = &'a RoomId> + Clone + Send + Sync + 'a,
-{
+) -> Result<BTreeMap<OwnedRoomId, response::Room>> {
 	let rooms: BTreeMap<_, _> = todo_rooms
 		.iter()
 		.try_stream()
 		.broad_and_then(async |(room_id, todo_room)| {
-			let is_invited = all_invited_rooms
-				.clone()
-				.any(is_equal_to!(room_id));
-
-			let room =
-				room::handle(services, next_batch, sync_info, room_id, todo_room, is_invited)
-					.await?;
+			let room = room::handle(services, next_batch, sync_info, room_id, todo_room).await?;

 			Ok((room_id, room))
 		})
@@ -513,7 +522,7 @@ async fn handle_extensions(
 	known_rooms: &KnownRooms,
 	todo_rooms: &TodoRooms,
 ) -> Result<response::Extensions> {
-	let &(_, _, _, request) = &sync_info;
+	let SyncInfo { request, .. } = sync_info;

 	let account_data: OptionFuture<_> = request
 		.extensions
@@ -569,26 +578,31 @@ async fn handle_extensions(
 	})
 }

-fn extension_rooms_todo<'a>(
-	(_, _, _, request): SyncInfo<'a>,
+fn extension_rooms_todo<'a, ListIter, ConfigIter>(
+	SyncInfo { request, .. }: SyncInfo<'a>,
 	known_rooms: &'a KnownRooms,
 	todo_rooms: &'a TodoRooms,
-	lists: Option<&'a Vec<String>>,
-	rooms: Option<&'a Vec<ExtensionRoomConfig>>,
-) -> impl Iterator<Item = &'a RoomId> + Send + 'a {
-	let lists_explicit = lists.into_iter().flat_map(|vec| vec.iter());
+	lists: Option<ListIter>,
+	rooms: Option<ConfigIter>,
+) -> impl Iterator<Item = &'a RoomId> + Send + Sync + 'a
+where
+	ListIter: Iterator<Item = &'a ListId> + Clone + Send + Sync + 'a,
+	ConfigIter: Iterator<Item = &'a ExtensionRoomConfig> + Clone + Send + Sync + 'a,
+{
+	let lists_explicit = lists.clone().into_iter().flatten();
+
+	let rooms_explicit = rooms
+		.clone()
+		.into_iter()
+		.flatten()
+		.filter_map(|erc| extract_variant!(erc, ExtensionRoomConfig::Room))
+		.map(AsRef::<RoomId>::as_ref);

 	let lists_requested = request
 		.lists
 		.keys()
 		.filter(move |_| lists.is_none());

-	let rooms_explicit = rooms
-		.into_iter()
-		.flat_map(|vec| vec.iter())
-		.filter_map(|erc| extract_variant!(erc, ExtensionRoomConfig::Room))
-		.map(AsRef::<RoomId>::as_ref);
-
 	let rooms_implicit = todo_rooms
 		.keys()
 		.map(AsRef::as_ref)
--- a/src/api/client/sync/v5/account_data.rs
+++ b/src/api/client/sync/v5/account_data.rs
@@ -6,7 +6,7 @@ use tuwunel_core::{
 };
 use tuwunel_service::Services;

-use super::{KnownRooms, SyncInfo, TodoRooms, extension_rooms_todo};
+use super::{KnownRooms, SyncInfo, TodoRoom, TodoRooms, extension_rooms_todo};

 #[tracing::instrument(level = "trace", skip_all, fields(globalsince, next_batch))]
 pub(super) async fn collect(
@@ -16,31 +16,39 @@ pub(super) async fn collect(
 	known_rooms: &KnownRooms,
 	todo_rooms: &TodoRooms,
 ) -> Result<response::AccountData> {
-	let (sender_user, _, globalsince, request) = sync_info;
-	let data = &request.extensions.account_data;
-	let rooms = extension_rooms_todo(
-		sync_info,
-		known_rooms,
-		todo_rooms,
-		data.lists.as_ref(),
-		data.rooms.as_ref(),
-	)
-	.stream()
-	.broad_filter_map(async |room_id| {
-		let &(_, _, roomsince) = todo_rooms.get(room_id)?;
-		let changes: Vec<_> = services
-			.account_data
-			.changes_since(Some(room_id), sender_user, roomsince, Some(next_batch))
-			.ready_filter_map(|e| extract_variant!(e, AnyRawAccountDataEvent::Room))
-			.collect()
-			.await;
+	let SyncInfo { sender_user, globalsince, request, .. } = sync_info;

-		changes
-			.is_empty()
-			.eq(&false)
-			.then(move || (room_id.to_owned(), changes))
-	})
-	.collect();
+	let lists = request
+		.extensions
+		.account_data
+		.lists
+		.as_deref()
+		.map(<[_]>::iter);
+
+	let rooms = request
+		.extensions
+		.account_data
+		.rooms
+		.as_deref()
+		.map(<[_]>::iter);
+
+	let rooms = extension_rooms_todo(sync_info, known_rooms, todo_rooms, lists, rooms)
+		.stream()
+		.broad_filter_map(async |room_id| {
+			let &TodoRoom { roomsince, .. } = todo_rooms.get(room_id)?;
+			let changes: Vec<_> = services
+				.account_data
+				.changes_since(Some(room_id), sender_user, roomsince, Some(next_batch))
+				.ready_filter_map(|e| extract_variant!(e, AnyRawAccountDataEvent::Room))
+				.collect()
+				.await;
+
+			changes
+				.is_empty()
+				.eq(&false)
+				.then(move || (room_id.to_owned(), changes))
+		})
+		.collect();

 	let global = services
 		.account_data
--- a/src/api/client/sync/v5/e2ee.rs
+++ b/src/api/client/sync/v5/e2ee.rs
@@ -29,10 +29,13 @@ use super::{SyncInfo, share_encrypted_room};
 #[tracing::instrument(level = "trace", skip_all, fields(globalsince, next_batch,))]
 pub(super) async fn collect(
 	services: &Services,
-	syncinfo: SyncInfo<'_>,
+	sync_info: SyncInfo<'_>,
 	next_batch: u64,
 ) -> Result<response::E2EE> {
-	let &(sender_user, sender_device, globalsince, _) = &syncinfo;
+	let SyncInfo {
+		sender_user, sender_device, globalsince, ..
+	} = sync_info;
+
 	let keys_changed = services
 		.users
 		.keys_changed(sender_user, globalsince, Some(next_batch))
@@ -46,7 +49,7 @@ pub(super) async fn collect(
 		.rooms_joined(sender_user)
 		.map(ToOwned::to_owned)
 		.broad_filter_map(async |room_id| {
-			collect_room(services, syncinfo, next_batch, &room_id)
+			collect_room(services, sync_info, next_batch, &room_id)
 				.await
 				.ok()
 		})
@@ -101,7 +104,7 @@ pub(super) async fn collect(
 #[tracing::instrument(level = "trace", skip_all, fields(room_id))]
 async fn collect_room(
 	services: &Services,
-	(sender_user, _, globalsince, _): SyncInfo<'_>,
+	SyncInfo { sender_user, globalsince, .. }: SyncInfo<'_>,
 	next_batch: u64,
 	room_id: &RoomId,
 ) -> Result<pair_of!(HashSet<OwnedUserId>)> {
--- a/src/api/client/sync/v5/receipts.rs
+++ b/src/api/client/sync/v5/receipts.rs
@@ -11,7 +11,7 @@ use tuwunel_core::{
 };
 use tuwunel_service::{Services, rooms::read_receipt::pack_receipts};

-use super::{KnownRooms, SyncInfo, TodoRooms, extension_rooms_todo};
+use super::{KnownRooms, SyncInfo, TodoRoom, TodoRooms, extension_rooms_todo};

 #[tracing::instrument(level = "trace", skip_all)]
 pub(super) async fn collect(
@@ -21,33 +21,41 @@ pub(super) async fn collect(
 	known_rooms: &KnownRooms,
 	todo_rooms: &TodoRooms,
 ) -> Result<response::Receipts> {
-	let (_, _, _, request) = sync_info;
-	let data = &request.extensions.receipts;
-	let rooms = extension_rooms_todo(
-		sync_info,
-		known_rooms,
-		todo_rooms,
-		data.lists.as_ref(),
-		data.rooms.as_ref(),
-	)
-	.stream()
-	.broad_filter_map(async |room_id| {
-		collect_room(services, sync_info, next_batch, todo_rooms, room_id).await
-	})
-	.collect()
-	.await;
+	let SyncInfo { request, .. } = sync_info;
+
+	let lists = request
+		.extensions
+		.receipts
+		.lists
+		.as_deref()
+		.map(<[_]>::iter);
+
+	let rooms = request
+		.extensions
+		.receipts
+		.rooms
+		.as_deref()
+		.map(<[_]>::iter);
+
+	let rooms = extension_rooms_todo(sync_info, known_rooms, todo_rooms, lists, rooms)
+		.stream()
+		.broad_filter_map(async |room_id| {
+			collect_room(services, sync_info, next_batch, todo_rooms, room_id).await
+		})
+		.collect()
+		.await;

 	Ok(response::Receipts { rooms })
 }

 async fn collect_room(
 	services: &Services,
-	(sender_user, ..): SyncInfo<'_>,
+	SyncInfo { sender_user, .. }: SyncInfo<'_>,
 	next_batch: u64,
 	todo_rooms: &TodoRooms,
 	room_id: &RoomId,
 ) -> Option<(OwnedRoomId, Raw<SyncReceiptEvent>)> {
-	let &(_, _, roomsince) = todo_rooms.get(room_id)?;
+	let &TodoRoom { roomsince, .. } = todo_rooms.get(room_id)?;
 	let private_receipt = services
 		.read_receipt
 		.last_privateread_update(sender_user, room_id)
--- a/src/api/client/sync/v5/room.rs
+++ b/src/api/client/sync/v5/room.rs
@@ -7,7 +7,7 @@ use futures::{
 use ruma::{
 	JsOption, MxcUri, OwnedMxcUri, RoomId, UInt, UserId,
 	api::client::sync::sync_events::{UnreadNotificationsCount, v5::response},
-	events::StateEventType,
+	events::{StateEventType, room::member::MembershipState},
 };
 use tuwunel_core::{
 	Result, at, debug_error, is_equal_to,
@@ -25,21 +25,25 @@ use crate::client::{DEFAULT_BUMP_TYPES, ignored_filter, sync::load_timeline};
 pub(super) async fn handle(
 	services: &Services,
 	next_batch: u64,
-	(sender_user, _, _globalsince, _): &SyncInfo<'_>,
+	SyncInfo { sender_user, .. }: SyncInfo<'_>,
 	room_id: &RoomId,
-	(required_state_request, timeline_limit, roomsince): &TodoRoom,
-	is_invited: bool,
+	&TodoRoom {
+		ref membership,
+		ref requested_state,
+		timeline_limit,
+		roomsince,
+	}: &TodoRoom,
 ) -> Result<Option<response::Room>> {
-	let timeline: OptionFuture<_> = is_invited
-		.eq(&false)
+	let timeline: OptionFuture<_> = membership
+		.ne(&MembershipState::Invite)
 		.then(|| {
 			load_timeline(
 				services,
 				sender_user,
 				room_id,
-				PduCount::Normal(*roomsince),
+				PduCount::Normal(roomsince),
 				Some(PduCount::from(next_batch)),
-				*timeline_limit,
+				timeline_limit,
 			)
 		})
 		.into();
@@ -52,7 +56,7 @@ pub(super) async fn handle(
 	let (timeline_pdus, limited, _lastcount) =
 		timeline.unwrap_or_else(|| (Vec::new(), true, PduCount::default()));

-	if *roomsince != 0 && timeline_pdus.is_empty() && !is_invited {
+	if roomsince != 0 && timeline_pdus.is_empty() && membership.ne(&MembershipState::Invite) {
 		return Ok(None);
 	}

@@ -60,7 +64,7 @@ pub(super) async fn handle(
 		.first()
 		.map(at!(0))
 		.map(PduCount::into_unsigned)
-		.or_else(|| roomsince.ne(&0).then_some(*roomsince))
+		.or_else(|| roomsince.ne(&0).then_some(roomsince))
 		.as_ref()
 		.map(ToString::to_string);

@@ -80,7 +84,7 @@ pub(super) async fn handle(
 			bump_stamp
 		});

-	let lazy = required_state_request
+	let lazy = requested_state
 		.iter()
 		.any(is_equal_to!(&(StateEventType::RoomMember, "$LAZY".into())));

@@ -97,7 +101,7 @@ pub(super) async fn handle(
 		.iter()
 		.map(|sender| (StateEventType::RoomMember, StateKey::from_str(sender.as_str())));

-	let required_state = required_state_request
+	let required_state = requested_state
 		.iter()
 		.cloned()
 		.chain(timeline_senders)
@@ -119,7 +123,8 @@ pub(super) async fn handle(
 		.collect();

 	// TODO: figure out a timestamp we can use for remote invites
-	let invite_state: OptionFuture<_> = is_invited
+	let invite_state: OptionFuture<_> = membership
+		.eq(&MembershipState::Invite)
 		.then(|| {
 			services
 				.state_cache
@@ -199,7 +204,7 @@ pub(super) async fn handle(
 	let num_live = None; // Count events in timeline greater than global sync counter

 	Ok(Some(response::Room {
-		initial: Some(*roomsince == 0),
+		initial: Some(roomsince == 0),
 		name: room_name.or(hero_name),
 		avatar: JsOption::from_option(room_avatar.or(heroes_avatar)),
 		invite_state: invite_state.flatten(),
--- a/src/api/client/sync/v5/to_device.rs
+++ b/src/api/client/sync/v5/to_device.rs
@@ -8,7 +8,9 @@ use super::SyncInfo;
 #[tracing::instrument(level = "trace", skip_all, fields(globalsince, next_batch))]
 pub(super) async fn collect(
 	services: &Services,
-	(sender_user, sender_device, globalsince, _request): SyncInfo<'_>,
+	SyncInfo {
+		sender_user, sender_device, globalsince, ..
+	}: SyncInfo<'_>,
 	next_batch: u64,
 ) -> Result<Option<response::ToDevice>> {
 	services
--- a/src/api/client/sync/v5/typing.rs
+++ b/src/api/client/sync/v5/typing.rs
@@ -2,7 +2,9 @@ use std::collections::BTreeMap;

 use futures::{FutureExt, StreamExt, TryFutureExt};
 use ruma::{
-	api::client::sync::sync_events::v5::response, events::typing::TypingEventContent, serde::Raw,
+	api::client::sync::sync_events::v5::response,
+	events::typing::{SyncTypingEvent, TypingEventContent},
+	serde::Raw,
 };
 use tuwunel_core::{
 	Result, debug_error,
@@ -21,37 +23,44 @@ pub(super) async fn collect(
 	todo_rooms: &TodoRooms,
 ) -> Result<response::Typing> {
 	use response::Typing;
-	use ruma::events::typing::SyncTypingEvent;

-	let (sender_user, _, _, request) = sync_info;
-	let data = &request.extensions.typing;
-	extension_rooms_todo(
-		sync_info,
-		known_rooms,
-		todo_rooms,
-		data.lists.as_ref(),
-		data.rooms.as_ref(),
-	)
-	.stream()
-	.filter_map(async |room_id| {
-		services
-			.typing
-			.typing_users_for_user(room_id, sender_user)
-			.inspect_err(|e| debug_error!(%room_id, "Failed to get typing events: {e}"))
-			.await
-			.ok()
-			.filter(|users| !users.is_empty())
-			.map(|users| (room_id, users))
-	})
-	.ready_filter_map(|(room_id, users)| {
-		let content = TypingEventContent::new(users);
-		let event = SyncTypingEvent { content };
-		let event = Raw::new(&event);
+	let SyncInfo { sender_user, request, .. } = sync_info;

-		Some((room_id.to_owned(), event.ok()?))
-	})
-	.collect::<BTreeMap<_, _>>()
-	.map(|rooms| Typing { rooms })
-	.map(Ok)
-	.await
+	let lists = request
+		.extensions
+		.typing
+		.lists
+		.as_deref()
+		.map(<[_]>::iter);
+
+	let rooms = request
+		.extensions
+		.typing
+		.rooms
+		.as_deref()
+		.map(<[_]>::iter);
+
+	extension_rooms_todo(sync_info, known_rooms, todo_rooms, lists, rooms)
+		.stream()
+		.filter_map(async |room_id| {
+			services
+				.typing
+				.typing_users_for_user(room_id, sender_user)
+				.inspect_err(|e| debug_error!(%room_id, "Failed to get typing events: {e}"))
+				.await
+				.ok()
+				.filter(|users| !users.is_empty())
+				.map(|users| (room_id, users))
+		})
+		.ready_filter_map(|(room_id, users)| {
+			let content = TypingEventContent::new(users);
+			let event = SyncTypingEvent { content };
+			let event = Raw::new(&event);
+
+			Some((room_id.to_owned(), event.ok()?))
+		})
+		.collect::<BTreeMap<_, _>>()
+		.map(|rooms| Typing { rooms })
+		.map(Ok)
+		.await
 }
--- a/src/service/sync/mod.rs
+++ b/src/service/sync/mod.rs
@@ -7,15 +7,18 @@ use std::{

 use ruma::{
 	OwnedDeviceId, OwnedRoomId, OwnedUserId,
-	api::client::sync::sync_events::v5::{Request, request},
+	api::client::sync::sync_events::v5::{
+		Request, request,
+		request::{AccountData, E2EE, Receipts, ToDevice, Typing},
+	},
 };
 use tuwunel_core::{Result, implement, smallstr::SmallString};
 use tuwunel_database::Map;

 pub struct Service {
-	db: Data,
 	services: Arc<crate::services::OnceServices>,
-	snake_connections: DbConnections<SnakeConnectionsKey, SnakeConnectionsVal>,
+	connections: Connections,
+	db: Data,
 }

 pub struct Data {
@@ -35,20 +38,22 @@ pub struct Data {
 }

 #[derive(Debug, Default)]
-struct SnakeSyncCache {
-	lists: BTreeMap<ListId, request::List>,
-	subscriptions: RoomSubscriptions,
+pub struct Cache {
+	lists: Lists,
 	known_rooms: KnownRooms,
+	subscriptions: Subscriptions,
 	extensions: request::Extensions,
 }

-pub type KnownRooms = BTreeMap<ListId, BTreeMap<OwnedRoomId, u64>>;
-pub type RoomSubscriptions = BTreeMap<OwnedRoomId, request::RoomSubscription>;
-pub type SnakeConnectionsKey = (OwnedUserId, OwnedDeviceId, Option<ConnId>);
-type SnakeConnectionsVal = Arc<Mutex<SnakeSyncCache>>;
-type DbConnections<K, V> = Mutex<BTreeMap<K, V>>;
+type Connections = Mutex<BTreeMap<ConnectionKey, Arc<Mutex<Cache>>>>;
+pub type ConnectionKey = (OwnedUserId, OwnedDeviceId, Option<ConnectionId>);
+pub type ConnectionId = SmallString<[u8; 16]>;
+
+pub type Subscriptions = BTreeMap<OwnedRoomId, request::RoomSubscription>;
+pub type Lists = BTreeMap<ListId, request::List>;
+pub type KnownRooms = BTreeMap<ListId, ListRooms>;
+pub type ListRooms = BTreeMap<OwnedRoomId, u64>;
 pub type ListId = SmallString<[u8; 16]>;
-pub type ConnId = SmallString<[u8; 16]>;

 impl crate::Service for Service {
 	fn build(args: &crate::Args<'_>) -> Result<Arc<Self>> {
@@ -69,7 +74,7 @@ impl crate::Service for Service {
 				userid_lastonetimekeyupdate: args.db["userid_lastonetimekeyupdate"].clone(),
 			},
 			services: args.services.clone(),
-			snake_connections: StdMutex::new(BTreeMap::new()),
+			connections: StdMutex::new(BTreeMap::new()),
 		}))
 	}

@@ -77,49 +82,54 @@ impl crate::Service for Service {
 }

 #[implement(Service)]
-pub fn update_snake_sync_request_with_cache(
-	&self,
-	snake_key: &SnakeConnectionsKey,
-	request: &mut Request,
-) -> KnownRooms {
-	let mut cache = self.snake_connections.lock().expect("locked");
-	let cached = Arc::clone(
-		cache
-			.entry(snake_key.clone())
-			.or_insert_with(|| Arc::new(Mutex::new(SnakeSyncCache::default()))),
-	);
+pub fn update_cache(&self, key: &ConnectionKey, request: &mut Request) -> KnownRooms {
+	let cache = self.get_connection(key);
+	let mut cached = cache.lock().expect("locked");

-	let cached = &mut cached.lock().expect("locked");
-	drop(cache);
-
-	//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.as_str()) {
-			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()),
-				| (..) => {},
-			}
-		}
+	Self::update_cache_lists(request, &mut cached);
+	Self::update_cache_subscriptions(request, &mut cached);
+	Self::update_cache_extensions(request, &mut cached);
+	cached.known_rooms.clone()
+}

+#[implement(Service)]
+fn update_cache_lists(request: &mut Request, cached: &mut Cache) {
+	for (list_id, request_list) in &mut request.lists {
 		cached
 			.lists
-			.insert(list_id.as_str().into(), list.clone());
+			.entry(list_id.as_str().into())
+			.and_modify(|cached_list| {
+				Self::update_cache_list(request_list, cached_list);
+			})
+			.or_insert_with(|| request_list.clone());
 	}
+}

+#[implement(Service)]
+fn update_cache_list(request: &mut request::List, cached: &mut request::List) {
+	list_or_sticky(
+		&mut request.room_details.required_state,
+		&mut cached.room_details.required_state,
+	);
+
+	match (&mut request.filters, &mut cached.filters) {
+		| (None, None) => {},
+		| (None, Some(cached)) => request.filters = Some(cached.clone()),
+		| (Some(request), None) => cached.filters = Some(request.clone()),
+		| (Some(request), Some(cached)) => {
+			some_or_sticky(&mut request.is_dm, &mut cached.is_dm);
+			some_or_sticky(&mut request.is_encrypted, &mut cached.is_encrypted);
+			some_or_sticky(&mut request.is_invite, &mut cached.is_invite);
+			list_or_sticky(&mut request.room_types, &mut cached.room_types);
+			list_or_sticky(&mut request.not_room_types, &mut cached.not_room_types);
+			list_or_sticky(&mut request.tags, &mut cached.not_tags);
+			list_or_sticky(&mut request.spaces, &mut cached.spaces);
+		},
+	}
+}
+
+#[implement(Service)]
+fn update_cache_subscriptions(request: &mut Request, cached: &mut Cache) {
 	cached
 		.subscriptions
 		.extend(request.room_subscriptions.clone());
@@ -127,150 +137,134 @@ pub fn update_snake_sync_request_with_cache(
 	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());
-
-	{
-		let (request, cached) = (&mut request.extensions.typing, &cached.extensions.typing);
-		some_or_sticky(&mut request.enabled, cached.enabled);
-		some_or_sticky(&mut request.rooms, cached.rooms.clone());
-		some_or_sticky(&mut request.lists, cached.lists.clone());
-	};
-	{
-		let (request, cached) = (&mut request.extensions.receipts, &cached.extensions.receipts);
-		some_or_sticky(&mut request.enabled, cached.enabled);
-		some_or_sticky(&mut request.rooms, cached.rooms.clone());
-		some_or_sticky(&mut request.lists, cached.lists.clone());
-	};
-
-	cached.extensions = request.extensions.clone();
-	cached.known_rooms.clone()
 }

 #[implement(Service)]
-pub fn update_snake_sync_known_rooms(
+fn update_cache_extensions(request: &mut Request, cached: &mut Cache) {
+	let request = &mut request.extensions;
+	let cached = &mut cached.extensions;
+
+	Self::update_cache_account_data(&mut request.account_data, &mut cached.account_data);
+	Self::update_cache_receipts(&mut request.receipts, &mut cached.receipts);
+	Self::update_cache_typing(&mut request.typing, &mut cached.typing);
+	Self::update_cache_to_device(&mut request.to_device, &mut cached.to_device);
+	Self::update_cache_e2ee(&mut request.e2ee, &mut cached.e2ee);
+}
+
+#[implement(Service)]
+fn update_cache_account_data(request: &mut AccountData, cached: &mut AccountData) {
+	some_or_sticky(&mut request.enabled, &mut cached.enabled);
+	some_or_sticky(&mut request.lists, &mut cached.lists);
+	some_or_sticky(&mut request.rooms, &mut cached.rooms);
+}
+
+#[implement(Service)]
+fn update_cache_receipts(request: &mut Receipts, cached: &mut Receipts) {
+	some_or_sticky(&mut request.enabled, &mut cached.enabled);
+	some_or_sticky(&mut request.rooms, &mut cached.rooms);
+	some_or_sticky(&mut request.lists, &mut cached.lists);
+}
+
+#[implement(Service)]
+fn update_cache_typing(request: &mut Typing, cached: &mut Typing) {
+	some_or_sticky(&mut request.enabled, &mut cached.enabled);
+	some_or_sticky(&mut request.rooms, &mut cached.rooms);
+	some_or_sticky(&mut request.lists, &mut cached.lists);
+}
+
+#[implement(Service)]
+fn update_cache_to_device(request: &mut ToDevice, cached: &mut ToDevice) {
+	some_or_sticky(&mut request.enabled, &mut cached.enabled);
+}
+
+#[implement(Service)]
+fn update_cache_e2ee(request: &mut E2EE, cached: &mut E2EE) {
+	some_or_sticky(&mut request.enabled, &mut cached.enabled);
+}
+
+/// 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: &mut Vec<T>) {
+	if !target.is_empty() {
+		cached.clone_from(target);
+	} else {
+		target.clone_from(cached);
+	}
+}
+
+fn some_or_sticky<T: Clone>(target: &mut Option<T>, cached: &mut Option<T>) {
+	if let Some(target) = target {
+		cached.replace(target.clone());
+	} else {
+		target.clone_from(cached);
+	}
+}
+
+#[implement(Service)]
+pub fn update_known_rooms(
 	&self,
-	key: &SnakeConnectionsKey,
+	key: &ConnectionKey,
 	list_id: ListId,
-	new_cached_rooms: BTreeSet<OwnedRoomId>,
+	new_rooms: BTreeSet<OwnedRoomId>,
 	globalsince: u64,
 ) {
 	assert!(key.2.is_some(), "Some(conn_id) required for this call");

-	let mut cache = self.snake_connections.lock().expect("locked");
-	let cached = Arc::clone(
-		cache
-			.entry(key.clone())
-			.or_insert_with(|| Arc::new(Mutex::new(SnakeSyncCache::default()))),
-	);
+	let cache = self.get_connection(key);
+	let mut cached = cache.lock().expect("locked");
+	let list_rooms = cached.known_rooms.entry(list_id).or_default();

-	let cached = &mut cached.lock().expect("locked");
-	drop(cache);
-
-	for (room_id, lastsince) in cached
-		.known_rooms
-		.entry(list_id.clone())
-		.or_default()
-		.iter_mut()
-	{
-		if !new_cached_rooms.contains(room_id) {
+	for (room_id, lastsince) in list_rooms.iter_mut() {
+		if !new_rooms.contains(room_id) {
 			*lastsince = 0;
 		}
 	}

-	let list = cached.known_rooms.entry(list_id).or_default();
-	for room_id in new_cached_rooms {
-		list.insert(room_id, globalsince);
+	for room_id in new_rooms {
+		list_rooms.insert(room_id, globalsince);
 	}
 }

 #[implement(Service)]
-pub fn update_snake_sync_subscriptions(
-	&self,
-	key: &SnakeConnectionsKey,
-	subscriptions: RoomSubscriptions,
-) {
-	let mut cache = self.snake_connections.lock().expect("locked");
-	let cached = Arc::clone(
-		cache
-			.entry(key.clone())
-			.or_insert_with(|| Arc::new(Mutex::new(SnakeSyncCache::default()))),
-	);
-
-	let cached = &mut cached.lock().expect("locked");
-	drop(cache);
-
-	cached.subscriptions = subscriptions;
+pub fn update_subscriptions(&self, key: &ConnectionKey, subscriptions: Subscriptions) {
+	self.get_connection(key)
+		.lock()
+		.expect("locked")
+		.subscriptions = subscriptions;
 }

 #[implement(Service)]
-pub fn forget_snake_sync_connection(&self, key: &SnakeConnectionsKey) {
-	self.snake_connections
+pub fn get_connection(&self, key: &ConnectionKey) -> Arc<Mutex<Cache>> {
+	self.connections
+		.lock()
+		.expect("locked")
+		.entry(key.clone())
+		.or_insert_with(|| Arc::new(Mutex::new(Cache::default())))
+		.clone()
+}
+
+#[implement(Service)]
+pub fn forget_connection(&self, key: &ConnectionKey) {
+	self.connections
 		.lock()
 		.expect("locked")
 		.remove(key);
 }

 #[implement(Service)]
-pub fn snake_connection_cached(&self, key: &SnakeConnectionsKey) -> bool {
-	self.snake_connections
+pub fn is_connection_cached(&self, key: &ConnectionKey) -> bool {
+	self.connections
 		.lock()
 		.expect("locked")
 		.contains_key(key)
 }

 #[inline]
-pub fn into_snake_key<U, D, C>(
-	user_id: U,
-	device_id: D,
-	conn_id: Option<C>,
-) -> SnakeConnectionsKey
+pub fn into_connection_key<U, D, C>(user_id: U, device_id: D, conn_id: Option<C>) -> ConnectionKey
 where
 	U: Into<OwnedUserId>,
 	D: Into<OwnedDeviceId>,
-	C: Into<ConnId>,
+	C: Into<ConnectionId>,
 {
 	(user_id.into(), device_id.into(), conn_id.map(Into::into))
 }
-
-/// 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);
-	}
-}
-
-fn some_or_sticky<T>(target: &mut Option<T>, cached: Option<T>) {
-	if target.is_none() {
-		*target = cached;
-	}
-}