IndexedDB: Add IndexedDB implementation of Event-related functions in EventCacheStore

[mgoldenberg]

Background

This pull request is part of a series of pull requests to add a full IndexedDB implementation of the EventCacheStore (see #4617, #4996, #5090, #5138, #5226, #5274, #5343, #5384, #5406). This particular pull request focuses on providing implementations for the Event-related functions in EventCacheStore.

Changes

The changes include implementations of the following functions, as well as tests for each of them.

• EventCacheStore::filter_duplicated_events
• EventCacheStore::find_event
• EventCacheStore::find_event_relations
• EventCacheStore::save_event

I have also added a few other functions which support the implementation of the functions above.

• IndexedEventRelationKey::set_related_event
• IndexeddbEventCacheStoreTransaction::get_event_by_id
• IndexeddbEventCacheStoreTransaction::get_events_by_relation
• IndexeddbEventCacheStoreTransaction::get_events_by_related_event

Bug Fixes

There is also a small change to how Update::PushItems is handled. Namely, if a given item already exists in the database, it will update that item, rather than returning an error. The new behavior is consistent with the SQLite implementation of EventCacheStore (see here).

This bug was surfaced by matrix_sdk_base::event_cache::store::integration_tests::test_find_event_relations.

Future Work

• Add implementation of EventCacheStore::try_take_leased_lock functions without relying on MemoryStore
• Add implementation of EventCacheStoreMedia

---

• Public API changes documented in changelogs (optional)

Signed-off-by: Michael Goldenberg m@mgoldenberg.net

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.83%. Comparing base (471e3c3) to head (783019e).

✅ All tests successful. No failed tests found.

Additional details and impacted files

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  Coverage   88.83%   88.83%           
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  Files         334      334           
  Lines       91015    91015           
  Branches    91015    91015           
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+ Hits        80854    80857    +3     
+ Misses       6348     6345    -3     
  Partials     3813     3813           

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