crypto: add logging for withheld data in key bundles

Author: richvdh

crates/matrix-sdk-crypto/src/machine/mod.rs

@@ -897,7 +897,7 @@ impl OlmMachine {
         // This function is only ever called by add_room_key via
         // handle_decrypted_to_device_event, so sender, sender_key, and algorithm are
         // already recorded.
-        fields(room_id = ? content.room_id, session_id, message_index)
+        fields(room_id = ? content.room_id, session_id, message_index, shared_history = content.shared_history)
     )]
     async fn handle_key(
         &self,

crates/matrix-sdk-crypto/src/store/mod.rs

@@ -1717,6 +1717,8 @@ impl Store {
         bundle_info: &StoredRoomKeyBundleData,
         bundle: &RoomKeyBundle,
     ) -> Result<(), CryptoStoreError> {
+        let mut session_id_to_withheld_code_map = BTreeMap::new();
+
         let mut changes = Changes::default();
         for withheld in &bundle.withheld {
             let (room_id, session_id) = match withheld {
@@ -1744,9 +1746,17 @@ impl Store {
                     content: withheld.to_owned(),
                 },
             );
+            session_id_to_withheld_code_map.insert(session_id, withheld.withheld_code());
         }
+
         self.save_changes(changes).await?;
 
+        info!(
+            room_id = ?bundle_info.bundle_data.room_id,
+            ?session_id_to_withheld_code_map,
+            "Successfully imported withheld info from room key bundle",
+        );
+
         Ok(())
     }
 }