fix(cache): clean up lib

[MasterPtato]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

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Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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[MasterPtato]

• chore: envoy client #4521 : 2 dependent PRs (#4531 , #4534 )
• feat(pb): actors v3 #4463
• feat(ups): implement queue subs #4486
• feat(cache): add in flight deduping #4459
• fix(cache): clean up lib #4457 👈 (View in Graphite)
• fix(config): allow configuring topo dcs via map, fix pg ssl mode config #4456
• fix(api): dont 500 on cross dc response #4449
• chore: update byte units on frontend #4444
• fix: runner alloc idx logic, api auth for actor get #4443
• main

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commit: e65f84d

[claude]

PR Review: fix(cache): clean up lib

Overall this is a solid simplification PR - net -309 lines with cleaner APIs. A few notes:

Positives

• Double-encoding removed: the old encoder chain through a ValueSerde intermediate type was needlessly indirect. The new Encoder: Fn(&Value) -> Result<Vec<u8>> is much cleaner.
• Metrics moved to purge_local: previously tracked inside InMemoryDriver::delete_keys (wrong layer). Moving to RequestConfig::purge_local gives better cohesion and fires regardless of driver.
• Arc clone instead of Driver clone: replacing driver.clone() with cache.clone() (an Arc clone) in the write spawn is strictly better.
• todo!() removal: the Redis match arm was already todo!() before this PR; removing the enum variant entirely is the right move.

Issues to Verify

fetch_one and fetch_all were pub methods on RequestConfig. Check that nothing outside the cache package still calls them. A quick grep for fetch_one, fetch_all, or .rate_limit( would confirm.

rate_limit.rs is fully deleted. If any service was calling cache.rate_limit(), it would fail to compile. Worth confirming no downstream callers remain before merge.

Minor Notes

• The default capacity jump from 1,000 to 10,000 (10x) is fine but worth a brief comment explaining the rationale (e.g., measured memory use is acceptable, or the previous limit was causing unnecessary cache evictions).
• get now takes Vec<RawCacheKey> by value rather than &[String] by reference. This forces an allocation at each call site but is consistent with the new ownership model and not a real concern at this scale.

No blocking issues - the changes compile cleanly (Redis variant removed from both enum and match), and the simplifications are correct.

[NathanFlurry]

Merge activity

• Apr 5, 11:11 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Apr 5, 11:19 AM UTC: Graphite rebased this pull request as part of a merge.
• Apr 5, 11:19 AM UTC: @NathanFlurry merged this pull request with Graphite.