fix: stuck typing indicators

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

@@ -1,4 +1,5 @@
 use std::collections::HashSet;
+use std::mem;
 
 use ruma::{OwnedUserId, RoomId, UserId};
 
@@ -53,6 +54,48 @@ impl service::rooms::edus::typing::Data for KeyValueDatabase {
         Ok(())
     }
 
+    fn typings_maintain(
+        &self,
+        room_id: &RoomId,
+    ) -> Result<()> {
+        let mut prefix = room_id.as_bytes().to_vec();
+        prefix.push(0xff);
+
+        let current_timestamp = utils::millis_since_unix_epoch();
+
+        let mut found_outdated = false;
+
+        // Find all outdated edus before inserting a new one
+        for outdated_edu in self
+            .typingid_userid
+            .scan_prefix(prefix)
+            .map(|(key, _)| {
+                Ok::<_, Error>((
+                    key.clone(),
+                    utils::u64_from_bytes(
+                        &key.splitn(2, |&b| b == 0xff).nth(1).ok_or_else(|| {
+                            Error::bad_database("RoomTyping has invalid timestamp or delimiters.")
+                        })?[0..mem::size_of::<u64>()],
+                    )
+                    .map_err(|_| Error::bad_database("RoomTyping has invalid timestamp bytes."))?,
+                ))
+            })
+            .filter_map(|r| r.ok())
+            .take_while(|&(_, timestamp)| timestamp < current_timestamp)
+        {
+            // This is an outdated edu (time > timestamp)
+            self.typingid_userid.remove(&outdated_edu.0)?;
+            found_outdated = true;
+        }
+
+        if found_outdated {
+            self.roomid_lasttypingupdate
+                .insert(room_id.as_bytes(), &services().globals.next_count()?.to_be_bytes())?;
+        }
+
+        Ok(())
+    }
+
     fn last_typing_update(&self, room_id: &RoomId) -> Result<u64> {
         Ok(self
             .roomid_lasttypingupdate