fix(invalidation): invalidate_cache(args) also deletes the pre-0.20.0 key (LAB-5288)

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What

fn.invalidate_cache(*args) / await fn.ainvalidate_cache(*args) on a generated-key decorator now also deletes the pre-0.20.0 key for the same call, not just the current one.

Why

Before 0.20.0, every generated key ended in serializer code s whatever the serializer was. #311 put the real code in the key. So a decorator on serializer="auto", "orjson", "arrow" or a serializer instance now writes and invalidates :1a, :1o, :1w or :1x…, while its pre-upgrade entries still sit at :{integrity_flag}s. Old replicas also keep writing that key during a rolling deploy.

Single-key invalidation deleted only the new key. An erasure, consent-withdrawal or permission-revocation call therefore returned normally, and the pre-upgrade copy survived to its TTL. At ttl=None it survived forever, and with encryption off it was plaintext.

Change

Since #312, single-key invalidation deletes the key _resolve_cache_key derives, through _invalidate_key in decorators/wrapper.py. This PR adds the pre-0.20.0 twin to that path:

• CacheOperationHandler.get_legacy_cache_key returns the key a pre-0.20.0 release wrote for the call, which is the same arguments with the default serializer's code. It shares one _generated_key helper with get_cache_key, so both hash the same arguments with reserved kwargs filtered out.
• The wrapper adds the twin only on the generated-key path, gated by one _generated_key_mode flag that also selects the generated branch in _resolve_cache_key. Interop, key= and fast_mode keys carry no serializer code. When the serializer is the default, the twin equals the current key and the wrapper issues one delete.
• Each key goes through _invalidate_key, so a failed twin delete is logged at ERROR with a redacted key, doesn't skip the current key, and is re-tracked so a later no-args invalidate_cache() retries it. The async path runs both deletes in one asyncio.to_thread hop, as #312 does for one.

There is one cost. A default-serializer decorator on the same function, namespace and arguments loses that entry and recomputes once. For an erasure, that is the right outcome.

Out of scope, on purpose: reading the legacy key (it would bring back the collision #311 fixed), any bulk or namespace flush helper, and any change to the key format.

Docs

docs/serializers/README.md now states what the SDK reaches (single-key invalidation on a generated key) and what still needs a backend flush: entries whose arguments are never invalidated, no-args invalidate_cache() / cache_clear() on a function that takes parameters (which reach only keys this release tracked, never a pre-upgrade one), and ttl=None personal data. It also says what stays uncovered: an erasure served by a pre-0.20.0 replica mid-rollout or after a rollback misses the new key, and any move away from a non-default serializer still orphans the old copy. docs/features/l1-invalidation.md mentions the twin delete on single-key invalidation.

The same pass fixes a wrong version. The migration section and docs/api-reference.md said the re-key shipped in v0.19.0, but #311 merged after the v0.19.0 tag and ships in 0.20.0.

Release notes

If this merges while #332 is still open, #311's 0.20.0 entry still says invalidate_cache() "can no longer reach the old copy". That sentence would then be false, so it needs a BEGIN_COMMIT_OVERRIDE on #311; the replacement text is on the tracking ticket. If this merges after 0.20.0 ships, this entry records the gap as closed from the next release.

Tests

• tests/unit/test_key_serializer_suffix.py::TestInvalidationReachesPre020Keys drives real decorators, sync and async, with serializer="auto" and with a serializer instance. Each test seeds the pre-0.20.0 key directly and asserts both keys are gone. It also covers exactly one delete for the default serializer, failure isolation in both directions, no twin for key=, fast_mode and interop, and a failed twin retried by no-args invalidation.
• tests/unit/test_error_path_key_redaction.py: both deletes log at ERROR with redacted keys.
• With the twin removed from both paths, 10 tests fail. With the key-mode guard removed, the three no-twin tests fail. With the full-key dedupe removed, the exactly-one-delete and one-delete redaction tests fail.
• Local: tests/unit + tests/critical pass (2891 passed, 13 skipped), --markdown-docs docs/ passes (122), tests/docs passes (70), cache_handler.py doctests pass, and ruff and basedpyright are clean.

---

Summary

Single-key invalidate_cache(args) / ainvalidate_cache(args) now deletes both the current key and the key a pre-0.20.0 release wrote for the same arguments. Before 0.20.0, generated keys always ended in the default serializer code s. This fix prevents an erasure from returning successfully while the pre-upgrade copy survives. The legacy key logic moves out of the removed CacheInvalidator into the operation handler and the decorator wrapper. Invalidation now uses the same key derivation as the read/write path.

The PR also adds whole-function invalidation through a server-side key registry, changes circuit-breaker rejection behavior, and deprecates encryption auto-activation.

Public API changes

cachekit.cache_handler

• Removed: CacheInvalidator, along with its invalidate_cache, invalidate_cache_async, set_backend and _invalidation_keys.
• Added: CacheOperationHandler.get_legacy_cache_key(func, args, kwargs, namespace, integrity_checking=True). It returns the pre-0.20.0 key, which equals get_cache_key when the default serializer is used.
• Added: StoreOutcome(envelope, stored) NamedTuple.
• Changed: CacheOperationHandler.store_result and store_result_async now return StoreOutcome instead of Optional[bytes].
  • stored reports whether the backend write succeeded.
  • envelope holds the bytes eligible for L1.
  • cache_stored is logged only on success.
• Added: supports_key_tracking(backend), a class-level type guard for KeyTrackableBackend (track_key / drain_tracked).

create_cache_wrapper

• Removed: the circuit_breaker_config parameter. Breaker settings now come from config.circuit_breaker: failure_threshold, success_threshold, recovery_timeout, and half_open_requests are now applied to the live breaker.
• Changed: namespace="ck" and any namespace starting with ck: raise ConfigurationError. These are reserved for the key registry.

Behavioral changes

Single-key invalidation

• The key is resolved by the same function as reads and writes, so custom key= and fast_mode keys are invalidated correctly.
• The legacy twin key is deleted only for generated keys whose serializer code differs from the default.
• If a delete fails:
  • the failure is logged at ERROR;
  • the key is re-tracked, so a later no-args invalidate_cache() retries it.
• Async variants run the sync deletes via asyncio.to_thread.
• Interop mode now applies ensure_interop_backend_compatible on invalidation as well.

Whole-function invalidation

• On key-trackable backends:
  • each successful L2 write records its key in a per-function, tenant-scoped registry set;
  • no-args invalidation drains that set plus the locally tracked keys;
  • if the drain fails, it falls back to deleting process-local keys only.
• If tracking a key fails, a throttled WARNING is logged, at most once per 60 s per function, with a failure count.
• Local key tracking is now scoped per tenant prefix, so one tenant's invalidation does not delete or untrack another tenant's L2 entries.

Circuit breaker

• A rejected request (breaker OPEN, or half-open with its probe budget spent) now runs the function uncached instead of raising BackendError.
• Rejections are not recorded as failures, in both the sync and async paths.

Encryption

• Auto-enabling encryption because CACHEKIT_MASTER_KEY is present is now deprecated.
• A one-time, per-process WARNING is logged after a handler is constructed successfully.
• stale_ttl validation now runs before the serialization handler is built, so a decorator that fails validation does not use up that one warning.

Documentation

• API reference:
  • ttl defaults are now documented per preset.
  • The circuit-breaker config fields are corrected.
  • The removed CACHEKIT_DEFAULT_TTL / default_ttl references are dropped.
  • The "default" and "pythonic" serializer names are documented.
• L1 invalidation page:
  • adds the key registry: backend support, Redis requirements, set lifetime, tenant scoping, and the reserved namespace;
  • documents that single-key invalidation also deletes the legacy key;
  • marks secure() as not supporting SWR.
• Serializer README: notes that no-args invalidation cannot reach pre-upgrade keys.

Tests

• Tests that used CacheInvalidator now go through the decorator.
• New tests cover:
  • no legacy twin for the key=, fast_mode, and interop modes;
  • retry of a failed legacy-key delete by a later no-args invalidation.

Summary by CodeRabbit

• Bug Fixes
  • Cache invalidation now attempts to remove both the current entry and its matching pre-v0.20.0 entry when using a non-default serializer. A failure to delete one entry no longer prevents an attempt to delete the other.
• Documentation
  • Updated the v0.20.0 serializer-key migration guidance, including rolling-deployment considerations, invalidation coverage and when a backend flush may be needed. The API reference now links to the v0.20.0 breaking-change documentation.

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Walkthrough

Generated-key invalidation now attempts to delete the current key and its matching pre-v0.20.0 key when they differ. Sync and async tests cover deletion outcomes and error redaction. Documentation describes the updated migration behaviour and its limits.

Changes

Cache key invalidation

Layer / File(s)	Summary
Key generation and deletion src/cachekit/cache_handler.py, src/cachekit/decorators/wrapper.py	Generated-key invalidation derives the current key and, when different, its pre-v0.20.0 counterpart. Sync and async paths attempt deletion of each key.
Invalidation behaviour and validation tests/unit/test_key_serializer_suffix.py, tests/unit/test_error_path_key_redaction.py	Tests cover default and non-default serializers, deletion failures, retry behaviour, single-delete modes, and redaction of key-bearing errors.
Upgrade and invalidation guidance docs/api-reference.md, docs/features/l1-invalidation.md, docs/serializers/README.md	The documentation updates the version references and describes legacy-key cleanup, migration limits, and flush guidance.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 72668

No actionable merge-blocking risk remains. The rollback guidance now gives the correct old-key suffix when integrity checking is disabled.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 72668

The change improves removal of pre-upgrade cache copies without establishing a new cross-tenant exposure. Erasure is still best effort, and mixed-version deployments need the documented replay or cleanup steps.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The newly reachable delete targets one additional serializer-suffix key for the same bound call, not an arbitrary caller-supplied function or namespace. It can also evict a default-serializer entry for that call, an effect the migration guide explicitly describes.

Security Findings and Attack Paths

• inferred — No PR-introduced privilege or cross-tenant attack path was established. A failed legacy delete can still leave an old copy after normal return, but the prior implementation never attempted that delete; this is a residual limit of the improvement, not evidence that the PR worsens that exposure.

Trust Boundaries and Controls

• observed — The inspected tenant-scoped Redis backend prefixes a key using the current tenant context before deletion. This supports isolation for that backend; the same guarantee was not verified for every backend or deployment configuration.

Resilience and Maintainability Implications

• inferred — In-process re-tracking provides a later retry for a caught deletion error, but does not demonstrate recovery if execution stops between the two deletes or the process loses its tracked state.

Hardening Proposals

• proposed — If callers require confirmed erasure rather than best-effort cache invalidation, define a completion or durable-retry contract for both keys and pair it with the documented mixed-version replay or backend-flush procedure.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

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Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 48.65% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 37 functions across 4 files. (3 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

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Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly identifies the primary change: generated-key invalidation now also deletes the pre-0.20.0 key. It is concise and specific.
Description check	✅ Passed	The description provides clear motivation, implementation details, scope limits, documentation updates, release-note impact, compatibility guidance, and detailed test results. It does not reproduce ev…

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Explanation

Docstring coverage is 48.65% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 37 functions across 4 files. (3 skipped: 3 unsupported.)

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---

### [1/2] src/cachekit/cache_handler.py:1812
Issue identified during code review:
Violates team rule 'Add specific exception handling': Catch and handle only the exceptions you expect (e.g., KeyError, ValueError, TimeoutError); let unknown ones bubble.

---

### [2/2] src/cachekit/cache_handler.py:1811
Issue identified during code review:
Swallowed exception in `_delete`: the `BackendError` handler logs the failure and returns normally, which violates the stated rule that erasure must not return normally while data survives. When the backend delete fails for a key, `invalidate_cache` / `invalidate_cache_async` report success and the retained entry stays in the cache. Fix: have `_delete` return the caught exception, then raise an aggregated error (or an `ExceptionGroup`) in `invalidate_cache` / `invalidate_cache_async` after all keys have been attempted.

**Also found in:**
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• Request a Review: Ask Kody to review your PR manually by adding a comment with the `@kody start-review` command at the root of your PR.

• Provide Feedback: Help Kody learn and improve by reacting to its comments with a 👍 for helpful suggestions or a 👎 if improvements are needed.

Providing Context (Files & MCPs)

Add these hints in your PR description (or a comment) to unlock deeper checks:

• Ticket / Acceptance Criteria: `Refs: ABC-123` (Linear/Jira/Asana/ClickUp/Trello) or a direct ticket link.
• Bugfix Validation: a Sentry/Datadog/Bugsnag event link (or paste the stack trace/error message).
• Endpoint Risk: mention the route (e.g., `POST /api/payments`) or controller/action name.
• Attach a repo file as context: use an explicit marker like `@file:docs/guide.mdx#L10-L50` (replace with your real path).
• API Contract Docs: include `@file:openapi.yaml` or `@file:swagger.json` when changing routes/schemas.
• Definition of Done / Standards: include `@file:DOD.md` or `@file:CONTRIBUTING.md` if your repo has them.
• Design System Source of Truth: include `@file:ui/index.ts` (replace with your DS entrypoint path).
• Feature Flags: include the flag key/name and `@file:flags.ts` / `@file:config.json` (and optionally the PostHog flag name).
• Edge/CDN Rules: link the Cloudflare rule/zone or describe the intended redirect/header behavior.
• Attach an MCP tool output: use `@mcp<provider|tool>` (replace with an installed MCP provider + tool, e.g., `@mcp<sentry|events.search>`).

Current Kody Configuration

Review Options

The following review options are enabled or disabled:

Options	Enabled
Bug	✅
Performance	✅
Security	✅
Business Logic	✅

Access your configuration settings here.