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Bump cachekit-core 0.5 -> 0.6 and read through Keyring::decrypt_indexed so the winning key position reaches the SDK. EncryptionLayer counts reads served by each previous key (AtomicU64 per position, current-key reads not counted) and exposes them via previous_key_hits(), also on SecureCache. An operator running a rotation grace window watches the retiring key's count stop growing before dropping it, instead of guessing at a hard cut-over. Error-class mapping and attempt sequencing are unchanged (core owns the loop, LAB-683). No key material in the signal: positions and counts only.
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Included review availability: 0 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 1 review per hour. WalkthroughThe encryption layer now counts successful decryptions made with previous rotation keys. ChangesPrevious-key rotation telemetry
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant SecureCache
participant EncryptionLayer
participant Keyring
SecureCache->>EncryptionLayer: decrypt payload
EncryptionLayer->>Keyring: request indexed decryption
Keyring-->>EncryptionLayer: return plaintext and key position
EncryptionLayer->>EncryptionLayer: increment previous-key hit counter
EncryptionLayer-->>SecureCache: return decrypted value
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Docs: state that counts are per process and reset on restart, so operators aggregate across every instance holding the retiring key and watch a full TTL window before dropping it (a single restarted replica reading [0] is not a drained key). Operator workflow now lives in one Rust location (previous_key_hits rustdoc); type/field/handle docs point there. README code fence that restated the inline call removed. Code: debug_assert on the keyring index so an out-of-range index from core is loud under test while the release path stays panic-free. Integration test trimmed to the handle-wiring proof; index-0 silence is owned at the layer.
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Expert panel (critical stakes) — run in-session, findings applied at
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| Agent | Result |
|---|---|
| bug-hunter-supreme | NO FINDINGS |
| security-specialist | NO FINDINGS — verified: signal is Vec<u64> only, Debug omits it, no export; core 0.6.0 decrypt is a byte-equivalent delegate of decrypt_indexed, error-class mapping unchanged; lockfile checksum matches the crates.io .crate, 0.5→0.6 source diff is additive only |
| code-craftsman | MAJ applied: counters are per process and reset on restart, so the docs now tell operators to aggregate across every instance holding the retiring key and watch a full TTL window. MIN applied: debug_assert! on the keyring index (loud under test, release path stays panic-free) |
| catchphrase-agent | Cuts applied: operator workflow lives in one Rust location (previous_key_hits rustdoc; type/field/handle docs point there), README code fence that restated the inline call removed, integration test trimmed to the handle-wiring proof. Rejected: folding the drain assertions into rotation_round_trip_without_reencryption — the ticket requires the existing rotation tests to pass unmodified |
Verdict after fixes: SHIP. Vec<AtomicU64> + Relaxed + one guard + one delegate was judged the shortest working shape; the SecureCache passthrough is kept because both encryption fields are private and the alternative (an EncryptionLayer accessor) exposes raw encrypt/decrypt.
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Inline comments:
In `@crates/cachekit/src/encryption.rs`:
- Line 194: Update the counter increment around hits.fetch_add in the encryption
code to compile for wasm32-unknown-unknown without atomics, using a
WASM-compatible implementation or gating the counter while preserving hit
counting on targets that support AtomicU64.
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…678) The 'safe to drop' guidance said a flat counter over one TTL window was enough. The normative runbook (protocol decisions/key-rotation.md) is stricter, and the counter cannot see the gap: during a rolling promotion a lagging instance still writes under the retiring key and reads it as its own current key, which is deliberately silent (index 0). Per-entry TTLs via set_with_ttl can also outlive the default window. Both surfaces (README Key Rotation, previous_key_hits rustdoc) now state: complete the two-phase promotion first, start the clock when that deploy finishes fleet-wide, wait the longest TTL in use, aggregate across instances, and only then read a flat counter as drained. Adversarial finding by Helly R on PR #74.
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…LAB-1678) The beta job on this PR fails on 9 double_must_use errors in backend/mod.rs, all emitted by the async_trait macro: async-trait <=0.1.91 injects a bare #[must_use] onto every generated method, and beta clippy now flags that as redundant on methods already returning a must_use Result. Upstream fixed it in 0.1.92 (LAB-2545). That bump has sat unmerged in #72 for a week, so this PR carries the same one-package lockfile change rather than waiting on it; whichever lands second sees a trivial Cargo.lock conflict. Pulls syn 3.0.5 as a new transitive build dependency alongside syn 2 (deny.toml: multiple-versions = warn). Verified locally: beta clippy -D warnings clean, stable clippy clean, cargo +1.85 check passes, wasm32 check builds, 279 tests green.
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Resolves the Cargo.lock conflict: main now carries async-trait 0.1.92 with syn 3.0.4 (via #67), this branch had resolved syn 3.0.5. Taken main's lockfile and re-applied only the cachekit-core 0.6.0 pin, so the PR's lockfile diff against main is once again that single package.
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Closes LAB-1678. Consumes the cachekit-core 0.6.0
decrypt_indexedsurface (cachekit-io/cachekit-core#73) that #63 deferred: a previous-key hit is now observable, so an operator can watch a rotation drain reach zero before dropping the retired master key.What changed
crates/cachekit/Cargo.toml:cachekit-corepin0.5→0.6(features unchanged; 0.6.0 is additive).EncryptionLayer::decryptreads viaKeyring::decrypt_indexed. Plaintext, attempt sequencing (core-owned, LAB-683) and the error-class mapping (KeyDerivation/KeyringIndexOutOfRange→Config, elseEncryption) are unchanged; existing rotation tests pass unmodified.AtomicU64per previous key on the layer. Index 0 (current key) is not counted; indexi ≥ 1increments sloti - 1.EncryptionLayer::previous_key_hits() -> Vec<u64>(hits[i]↔previous_keys[i]) plus aSecureCache::previous_key_hits()passthrough so builder-configured clients can reach it. Pull-style, matching the crate'sMetricsProviderpattern; no new dependency, no user code on the decrypt hot path. The payload is positions and counts only, no key material, by type.current=k3, previous=[k2, k1]), and a failed decrypt counting nothing; an integration test reading the signal offSecureCache; a doc-test onprevious_key_hitsasserting the drain signal.### Key Rotationgains the operator workflow paragraph;EncryptionLayerrustdoc gains a "Rotation drain signal" section mirroring core'sdecrypt_indexedlanguage.Verification
cargo clippy --all-targets --features "cachekitio,redis,encryption,l1,macros,memcached,file" -- -D warnings: clean.cargo testwith the same feature set: all suites green (92 lib tests, doc-tests included).cargo +1.85 check --all-targets --features "cachekitio,redis,encryption,l1,macros": passes (MSRV).cargo check --target wasm32-unknown-unknown --no-default-features --features workers,cachekitio,encryption: builds; the 33 unused-import warnings are pre-existing in backend modules.prek run --all-files: every hook passes except detect-secrets, which flagstests/vectors/interop-mode.jsonon a cleanmaintoo (pre-existing, not touched here).Dependency bump evidence (cachekit-core 0.5 → 0.6)
Securityworkflow (cargo deny checkadvisories/bans/licenses/sources with--all-features+cargo auditonCargo.lock) passed on this branch: run 33617757729.cachekit-core@0.6.0(crates.io) returns no advisories (2026-09-03).Cargo.lock: sole change againstmainiscachekit-core 0.5.0 → 0.6.0, checksum93adc5646956ba8da140f4179a02e60a2cc7a401b83ebb1270cc4d03748e1fac(matches the published.crate); no new transitive packages. (mainalready carries theasync-trait0.1.92 bump that clears the betadouble_must_usecanary, so this PR no longer carries it — the branch is merged up tomain@92637cc.)Adversarial review (Helly R) — applied at
067ad65The "safe to drop" guidance omitted the runbook's write-fence and longest-TTL preconditions. README
### Key Rotationand theprevious_key_hitsrustdoc now state: complete the two-phase promotion first, start the clock only when that deploy completes fleet-wide (a lagging instance still writes under the retiring key and reads it silently as index 0), wait at least the longest TTL in use including explicitset_with_ttlvalues, aggregate across instances, and only then read a flat counter as drained. Positions are comparable across instances only once they share one keyring configuration.Out of scope, deliberately: switching the layer to core's new
TenantKeyring(LAB-1638 follow-up), py/ts exposure (neither has multi-key decrypt), the docs.cachekit.io runbook page (LAB-687).Summary by CodeRabbit
New Features
Documentation
Summary
Despite the PR title referencing a rotation drain signal via
decrypt_indexed(LAB-1678), the actual code changes in this PR are limited to documentation updates inREADME.md.Changes
The PR adds documentation to the security features section of the README describing the cache-key path encoding protection (CWE-22):
.,..,health,ttl,lock) is rejected rather than sent.urlencoding::encodeso a key can only address/v1/cache/{key}.reqweststrips dot segments before the request leaves the process, andhealth/ttl/lockare live route tokens).cachekit-tstwin and the stricter-thancachekit-pyhandling, and confirming no legitimate CacheKit keys are affected.Note
Based solely on the provided diff, this PR contains only documentation additions. No functional/source code changes (e.g., to
decrypt_indexedor a rotation drain signal) are present in the changes shown.Based on the code changes provided, here's a description for this pull request:
Description
Despite the PR title referencing rotation drain signals via
decrypt_indexed, the actual code changes in this PR are documentation and packaging updates. The changes fall into three areas:1. Version Bump in README (
0.5→0.7)All dependency examples throughout the README have been updated from
cachekit-rs = "0.5"tocachekit-rs = "0.7", covering the default, Redis, Memcached, File, and Cloudflare Workers configurations.2. New "Intent Presets" Documentation
A new Intent Presets (recommended) section was added to the Quick Start guide, documenting four one-call preset builders:
CacheKit::minimal(url)— development/public data, speed-first, no extrasCacheKit::production(url)— user sessions and production services with L1, reliability, and auto-reconnectCacheKit::encrypted(url, key)— PII/payments/GDPR-HIPAA data with AES-256-GCM encryptionCacheKit::io(api_key)— serverless/edge compute via cachekit.io without running RedisThe section includes a comparison table (backend, L1, encryption, reliability, auto-reconnect, default TTL), a runnable code example, and a detailed Resilience contract explaining connection-failure behavior at construction and mid-run for each preset (auto-reconnect vs. fail-fast semantics, initial connection handling, and master-key validation ordering).
The Overview intro was also rewritten to highlight the intent-preset approach.
3. docs.rs Build Configuration (
Cargo.toml)Added a
[package.metadata.docs.rs]section that enables thecachekitio,redis,encryption,l1,reliability,macros,memcached, andfilefeatures when building on docs.rs. This ensures the Redis intent presets and optional backends appear in the rendered documentation (docs.rs otherwise builds with default features only). Theworkersfeature is intentionally excluded due to being mutually exclusive with the other features.Note: The code changes shown do not include any modifications to
decrypt_indexedor rotation drain signal logic referenced in the PR title. The provided patches only touchREADME.mdandcrates/cachekit/Cargo.toml. If the rotation drain functionality is part of this PR, those source changes were not included in the diff provided for analysis.