feat(indexeddb): add IndexedDB-backed impl for EventCacheStore::find_event

Signed-off-by: Michael Goldenberg <[email protected]>

Author: mgoldenberg

crates/matrix-sdk-indexeddb/src/event_cache_store/integration_tests.rs

@@ -755,6 +755,13 @@ macro_rules! event_cache_store_integration_tests {
                     get_event_cache_store().await.unwrap().into_event_cache_store();
                 event_cache_store.test_filter_duplicated_events().await;
             }
+
+            #[async_test]
+            async fn test_find_event() {
+                let event_cache_store =
+                    get_event_cache_store().await.unwrap().into_event_cache_store();
+                event_cache_store.test_find_event().await;
+            }
         }
     };
 }

crates/matrix-sdk-indexeddb/src/event_cache_store/mod.rs

@@ -462,10 +462,14 @@ impl_event_cache_store! {
         event_id: &EventId,
     ) -> Result<Option<Event>, IndexeddbEventCacheStoreError> {
         let _timer = timer!("method");
-        self.memory_store
-            .find_event(room_id, event_id)
+
+        let transaction =
+            self.transaction(&[keys::EVENTS], IdbTransactionMode::Readonly)?;
+        transaction
+            .get_event_by_id(room_id, &event_id.to_owned())
             .await
-            .map_err(IndexeddbEventCacheStoreError::MemoryStore)
+            .map(|ok| ok.map(Into::into))
+            .map_err(Into::into)
     }
 
     #[instrument(skip(self, event_id, filters))]