IndexedDB: Add (de)serialization functionality for EventCacheStore backend

[mgoldenberg]

Background

This pull request is part of a series of pull requests to add an IndexedDB implementation of the EventCacheStore (see #4617, #4996, #5090, #5138). This particular pull request provides (de)serialization functionality for the types defined in #5138.

Changes

This change add a few traits to aid in (de)serialization and implements those traits on a relevant types. Furthermore, there is a struct for conveniently calling into those (de)serialization traits - i.e., IndexeddbEventCacheStoreSerializer.

traits and impls

• Indexed - converts high-level types to/from indexed types
  • impls:
    • Chunk ↔ IndexedChunk
    • Event ↔ IndexedEvent
    • Gap ↔ IndexedGap
• IndexedKey - encodes a key for an indexed type
  • impls:
    • Chunk
      • IndexedChunkIdKey
      • IndexedNextChunkIdKey
    • Event
      • IndexedEventIdKey
      • IndexedEventPositionKey
      • IndexedEventRelationKey
    • Gap
      • IndexedGapIdKey
• IndexedKeyBounds - encodes the lower and upper keys for an indexed type
  • impls:
    • Chunk
      • IndexedChunkIdKey
      • IndexedNextChunkIdKey
    • Event
      • IndexedEventIdKey
      • IndexedEventPositionKey
      • IndexedEventRelationKey
    • Gap
      • IndexedGapIdKey

Future Work

• Add convenient query functions that wrap (de)serialization logic
• Add implementation of EventCacheStore which uses query functions mentioned above

---

• Public API changes documented in changelogs (optional)

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

[Hywan]

Hey, what great patches! Thanks for them. I've left a handful of questions. Apart from that, I'm happy to approve it and merge it!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.16%. Comparing base (47c8df0) to head (7d8c185).
Report is 10 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5226      +/-   ##
==========================================
- Coverage   90.18%   90.16%   -0.02%     
==========================================
  Files         334      334              
  Lines      104681   104681              
  Branches   104681   104681              
==========================================
- Hits        94402    94390      -12     
- Misses       6226     6238      +12     
  Partials     4053     4053              

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[Hywan]

Excellent, thanks for the fixup patches! You can rebase your issue, and I'll merge it as soon as the CI is fixed (not your problem, the maintainers are fixing it).

[Hywan]

Can you rebase on top of main to get the new code coverage infra please?