feat(indexeddb): implement 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 88.85%. Comparing base (0e622cc) to head (45db71f).
Report is 5 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

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- Coverage   88.85%   88.85%   -0.01%     
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  Files         333      333              
  Lines       91547    91547              
  Branches    91547    91547              
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- Hits        81343    81340       -3     
- Misses       6379     6382       +3     
  Partials     3825     3825              

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[bnjbvr]

Thanks for the PR! Stealing review, as I'm more acquainted with the event cache.

[bnjbvr]

Sorry about the long review time! Holidays make it so that there are fewer of us working around this time.

Looks good in general, there's a tiny logic issue in the first commit, but the rest looks great, thanks!

[bnjbvr]

Thanks, with the linked-chunk-id keying postponed to later, LGTM 👍