fix: send device list updates when user is in no rooms

src/client_server.rs

@@ -672,7 +672,11 @@ pub fn set_displayname_route(
                     displayname: body.displayname.clone(),
                     ..serde_json::from_value::<Raw<_>>(
                         db.rooms
-                            .room_state_get(&room_id, &EventType::RoomMember, &sender_id.to_string())?
+                            .room_state_get(
+                                &room_id,
+                                &EventType::RoomMember,
+                                &sender_id.to_string(),
+                            )?
                             .ok_or_else(|| {
                                 Error::bad_database(
                                     "Tried to send displayname update for user not in the room.",
@@ -770,7 +774,11 @@ pub fn set_avatar_url_route(
                     avatar_url: body.avatar_url.clone(),
                     ..serde_json::from_value::<Raw<_>>(
                         db.rooms
-                            .room_state_get(&room_id, &EventType::RoomMember, &sender_id.to_string())?
+                            .room_state_get(
+                                &room_id,
+                                &EventType::RoomMember,
+                                &sender_id.to_string(),
+                            )?
                             .ok_or_else(|| {
                                 Error::bad_database(
                                     "Tried to send avatar url update for user not in the room.",
@@ -1884,12 +1892,11 @@ pub fn ban_user_route(
                 third_party_invite: None,
             }),
             |event| {
-                let mut event = serde_json::from_value::<Raw<member::MemberEventContent>>(
-                    event.content,
-                )
-                .expect("Raw::from_value always works")
-                .deserialize()
-                .map_err(|_| Error::bad_database("Invalid member event in database."))?;
+                let mut event =
+                    serde_json::from_value::<Raw<member::MemberEventContent>>(event.content)
+                        .expect("Raw::from_value always works")
+                        .deserialize()
+                        .map_err(|_| Error::bad_database("Invalid member event in database."))?;
                 event.membership = ruma::events::room::member::MembershipState::Ban;
                 Ok(event)
             },
@@ -2211,6 +2218,7 @@ pub async fn get_public_rooms_filtered_route(
             Ok::<_, Error>(chunk)
         })
         .filter_map(|r| r.ok()) // Filter out buggy rooms
+        // We need to collect all, so we can sort by member count
         .collect::<Vec<_>>();
 
     chunk.sort_by(|l, r| r.num_joined_members.cmp(&l.num_joined_members));
@@ -2618,6 +2626,13 @@ pub async fn sync_events_route(
     let mut presence_updates = HashMap::new();
     let mut device_list_updates = HashSet::new();
 
+    // Look for device list updates of this account
+    device_list_updates.extend(
+        db.users
+            .keys_changed(&sender_id.to_string(), since, None)
+            .filter_map(|r| r.ok()),
+    );
+
     for room_id in db.rooms.rooms_joined(&sender_id) {
         let room_id = room_id?;
 
@@ -2869,7 +2884,7 @@ pub async fn sync_events_route(
         // Look for device list updates in this room
         device_list_updates.extend(
             db.users
-                .keys_changed(&room_id, since, None)
+                .keys_changed(&room_id.to_string(), since, None)
                 .filter_map(|r| r.ok()),
         );
 
@@ -3652,11 +3667,28 @@ pub fn get_key_changes_route(
     let sender_id = body.sender_id.as_ref().expect("user is authenticated");
 
     let mut device_list_updates = HashSet::new();
+
+    device_list_updates.extend(
+        db.users
+            .keys_changed(
+                &sender_id.to_string(),
+                body.from
+                    .parse()
+                    .map_err(|_| Error::BadRequest(ErrorKind::InvalidParam, "Invalid `from`."))?,
+                Some(
+                    body.to
+                        .parse()
+                        .map_err(|_| Error::BadRequest(ErrorKind::InvalidParam, "Invalid `to`."))?,
+                ),
+            )
+            .filter_map(|r| r.ok()),
+    );
+
     for room_id in db.rooms.rooms_joined(sender_id).filter_map(|r| r.ok()) {
         device_list_updates.extend(
             db.users
                 .keys_changed(
-                    &room_id,
+                    &room_id.to_string(),
                     body.from.parse().map_err(|_| {
                         Error::BadRequest(ErrorKind::InvalidParam, "Invalid `from`.")
                     })?,

src/database.rs

@@ -126,16 +126,17 @@ impl Database {
     }
 
     pub async fn watch(&self, user_id: &UserId, device_id: &DeviceId) {
-        let mut userid_prefix = user_id.to_string().as_bytes().to_vec();
+        let userid_bytes = user_id.to_string().as_bytes().to_vec();
+
+        let mut userid_prefix = userid_bytes.clone();
         userid_prefix.push(0xff);
+
         let mut userdeviceid_prefix = userid_prefix.clone();
         userdeviceid_prefix.extend_from_slice(device_id.as_bytes());
         userdeviceid_prefix.push(0xff);
 
         let mut futures = futures::stream::FuturesUnordered::new();
 
-        futures.push(self.users.keychangeid_userid.watch_prefix(b""));
-
         // Return when *any* user changed his key
         // TODO: only send for user they share a room with
         futures.push(
@@ -171,6 +172,9 @@ impl Database {
                     .watch_prefix(&roomid_prefix),
             );
 
+            // Key changes
+            futures.push(self.users.keychangeid_userid.watch_prefix(&roomid_prefix));
+
             // Room account data
             let mut roomuser_prefix = roomid_prefix.clone();
             roomuser_prefix.extend_from_slice(&userid_prefix);
@@ -191,6 +195,16 @@ impl Database {
                 .watch_prefix(&globaluserdata_prefix),
         );
 
+        // More key changes (used when user is not joined to any rooms)
+        futures.push(self.users.keychangeid_userid.watch_prefix(&userid_prefix));
+
+        // One time keys
+        futures.push(
+            self.users
+                .userid_lastonetimekeyupdate
+                .watch_prefix(&userid_bytes),
+        );
+
         // Wait until one of them finds something
         futures.next().await;
     }

src/database/users.rs

@@ -9,7 +9,7 @@ use ruma::{
         },
     },
     events::{AnyToDeviceEvent, EventType},
-    DeviceId, Raw, RoomId, UserId,
+    DeviceId, Raw, UserId,
 };
 use std::{collections::BTreeMap, convert::TryFrom, mem, time::SystemTime};
 
@@ -23,7 +23,7 @@ pub struct Users {
 
     pub(super) onetimekeyid_onetimekeys: sled::Tree, // OneTimeKeyId = UserId + AlgorithmAndDeviceId
     pub(super) userid_lastonetimekeyupdate: sled::Tree, // LastOneTimeKeyUpdate = Count
-    pub(super) keychangeid_userid: sled::Tree,       // KeyChangeId = RoomId + Count
+    pub(super) keychangeid_userid: sled::Tree,       // KeyChangeId = UserId/RoomId + Count
     pub(super) keyid_key: sled::Tree,                // KeyId = UserId + KeyId (depends on key type)
     pub(super) userid_masterkeyid: sled::Tree,
     pub(super) userid_selfsigningkeyid: sled::Tree,
@@ -305,8 +305,7 @@ impl Users {
     }
 
     pub fn last_one_time_keys_update(&self, user_id: &UserId) -> Result<u64> {
-        self
-            .userid_lastonetimekeyupdate
+        self.userid_lastonetimekeyupdate
             .get(&user_id.to_string().as_bytes())?
             .map(|bytes| {
                 utils::u64_from_bytes(&bytes).map_err(|_| {
@@ -417,6 +416,11 @@ impl Users {
             self.keychangeid_userid.insert(key, &*user_id.to_string())?;
         }
 
+        let mut key = user_id.to_string().as_bytes().to_vec();
+        key.push(0xff);
+        key.extend_from_slice(&count);
+        self.keychangeid_userid.insert(key, &*user_id.to_string())?;
+
         Ok(())
     }
 
@@ -524,6 +528,11 @@ impl Users {
             self.keychangeid_userid.insert(key, &*user_id.to_string())?;
         }
 
+        let mut key = user_id.to_string().as_bytes().to_vec();
+        key.push(0xff);
+        key.extend_from_slice(&count);
+        self.keychangeid_userid.insert(key, &*user_id.to_string())?;
+
         Ok(())
     }
 
@@ -576,16 +585,22 @@ impl Users {
                 .insert(key, &*target_id.to_string())?;
         }
 
+        let mut key = target_id.to_string().as_bytes().to_vec();
+        key.push(0xff);
+        key.extend_from_slice(&count);
+        self.keychangeid_userid
+            .insert(key, &*target_id.to_string())?;
+
         Ok(())
     }
 
     pub fn keys_changed(
         &self,
-        room_id: &RoomId,
+        user_or_room_id: &str,
         from: u64,
         to: Option<u64>,
     ) -> impl Iterator<Item = Result<UserId>> {
-        let mut prefix = room_id.to_string().as_bytes().to_vec();
+        let mut prefix = user_or_room_id.as_bytes().to_vec();
         prefix.push(0xff);
 
         let mut start = prefix.clone();