fix(decorators): key and name the registry set by a str namespace's exact value (LAB-6197)

[27Bslash6]

This PR makes create_cache_wrapper (used by @cache) normalize any str namespace, including str subclasses, to its underlying str value before the namespace is used anywhere. No-args invalidate_cache() also drains the registry set named under the pre-fix rendering, so entries tracked before the upgrade are still invalidated.

Changes to public behavior

@cache(namespace=...) / create_cache_wrapper

• A str namespace is rebound to str.__str__(namespace) before interop validation, the reserved-ck check, registry id construction and key= key construction.
• As a result, a (str, Enum) member USERS = "users" resolves to users on every Python version. Previously, on 3.11+, it rendered as NS.USERS in:
  • registry ids (ck:reg:{namespace}:…)
  • custom key= keys ({namespace}:{key})
  • the namespace metrics label, the structured-log field and the cache.namespace span attribute
• str subclasses that override __format__, __eq__ or startswith can no longer:
  • produce a registry id or key that differs from their underlying value
  • get past the ck / ck:* reservation

invalidate_cache() (no-args)

• _drain_all now issues a second drain_tracked(_legacy_registry_id, ()) call when the pre-fix f-string rendering differs from the exact value. The deleted keys from both calls are merged.
• Plain str, StrEnum and namespace=None still produce identical ids and a single drain call.
• A code comment states that the legacy drain may be removed only in a major release that declares upgrades from pre-fix versions unsupported.

Upgrade impact for (str, Enum) namespaces on Python 3.11+

• Auto-mode keys: unchanged.
• Registry set: renamed. Pre-upgrade entries are covered by the legacy drain.
• Custom key= entries: move from NS.USERS:k to users:k.
  • Old entries are no longer served.
  • They are not deleted; they expire by TTL, or never if no TTL was set.
• Rolling deploys: a no-args invalidation from a replica still on the old release misses keys tracked by upgraded replicas until the rollout completes.

Documentation

docs/features/l1-invalidation.md gains a "str subclass namespaces" section covering:

• the three upgrade effects above
• a SCAN/UNLINK recipe for removing orphaned key= entries on Redis
• the rolling-deploy caveat

Tests

TestNamespaceExactStr in tests/unit/test_key_registry.py covers:

• the registry id and key= key for a (str, Enum) namespace
• __format__ forgery
• __eq__/startswith bypass of the ck reservation
• draining of the legacy registry set
• the single-drain behavior for plain str, StrEnum-style and None namespaces

---

Summary

This PR changes how the key registry handles str subclass namespaces, such as (str, Enum) members, in two ways:

• Interop is excluded from the legacy drain. With interop= set, a no-args invalidate_cache() no longer drains a second, pre-fix registry set.
• The upgrade notes are rewritten. The documentation now spells out what changes for (str, Enum) namespaces when upgrading.

Changes

• create_cache_wrapper (src/cachekit/decorators/wrapper.py)

  • The legacy registry set ID (ck:reg:{legacy_namespace}:{hash}) is now computed only when interop is None.
  • Rationale in the code: 0.20.0 shipped the registry with interop's exact-str rebind, so no release ever wrote a non-exact interop set. Draining one would target a set that does not exist.
  • The code comments now say the legacy drain covers the set name 0.20.x wrote. It should be removed only in a major release that declares upgrades from 0.20.x unsupported.
  • Comments were also updated to say that namespace is already exact before the interop validation block. That block now rebinds only interop.

• Documentation (docs/features/l1-invalidation.md)

  • The single paragraph on str subclass namespaces is replaced with a structured list:
    • Custom key= entries move (Python 3.11+): they move from NS.USERS:k to users:k.
      • Old entries that are still tracked in the old registry set can be deleted with one no-args invalidate_cache() per tenant.
      • Old entries that are not tracked retire only by TTL.
      • Cleanup instructions are given for tenant-scoped Redis backends (t:*:NS.USERS:*) and for plain RedisBackend (NS.USERS:*).
    • The key registry set is renamed (Python 3.11+): it moves from ck:reg:NS.USERS:… to ck:reg:users:…. A no-args invalidate_cache() drains both sets.
    • Rolling deploys and rollbacks: processes on the earlier release drain only the old set. Operators should run a no-args invalidate_cache() per tenant, from a process on this release, once the rollout or rollback completes.
    • Observability: the namespace metrics label changes on every Python version, including 3.10. The log-message prefix changes on 3.11 and later.

• Tests (tests/unit/test_key_registry.py)

  • test_unchanged_namespaces_drain_once is replaced by the parametrized test_no_args_drain_ids. It checks the expected drain IDs for:
    • a plain str namespace
    • a StrEnum namespace
    • no namespace
    • a (str, Enum) namespace, which drains the legacy set only on Python 3.11 and later
    • a (str, Enum) namespace with interop set, which produces no legacy drain

Public API impact

• The signatures of invalidate_cache() and @cache(...) are unchanged.
• Behavioral change: a no-args invalidate_cache() on functions decorated with interop= no longer drains a legacy registry set.

---

Summary

This PR updates the str subclass namespace section of docs/features/l1-invalidation.md. It documents how upgrading affects (str, Enum) namespaces, which are now keyed and named by their exact str value (e.g. users, not NS.USERS). The update separates the upgrade behavior of functions that take parameters from that of zero-parameter functions. The patch contains no code changes and no public API signatures change. The documented behavior of the no-args invalidate_cache() is refined.

Documentation changes

Custom key= entries (Python 3.11+)

• Functions with parameters: a no-args invalidate_cache() from an upgraded process deletes old entries still tracked in the old registry set. It must be run once per tenant.
• Zero-parameter functions: a no-args invalidate_cache() deletes only the new users:k entry. It never drains a registry set, so the old NS.USERS:k entry survives.
• These old entries retire only by TTL, or never if no TTL was set. The scan_iter + unlink cleanup script is the way to erase them.

Registry set rename (Python 3.11+)

• Functions with parameters: a no-args invalidate_cache() drains both the old and new sets.
• Zero-parameter functions: the single auto-mode key is deleted directly.

Rolling deploys and rollbacks (Python 3.11+)

• During a rollout: a no-args invalidate_cache() from an older-release process misses entries that upgraded processes serve.
  • Functions with parameters: it drains only the old set.
  • Zero-parameter functions in auto mode: nothing is missed.
  • Zero-parameter functions with key=: users:k is left behind.
• After a rollout: run one no-args invalidate_cache() per tenant from an upgraded process.
• After a rollback: the gap runs in the reverse direction for entries tracked in the new set, which persists seven days after its last write. For key= functions, the earlier release also serves stale NS.USERS:k entries again. The recommended remediation is:
  1. Run a per-tenant no-args invalidate_cache() from a one-off script on this release.
  2. Run the scan_iter + unlink cleanup for the old key= entries.

---

Summary

A str subclass passed as namespace to @cache / create_cache_wrapper is now normalized to its exact str value (str.__str__(namespace)) before any use. Previously, such a value was rendered through its own __format__, __eq__ and startswith. As a result, a (str, Enum) member such as NS.USERS = "users" rendered as NS.USERS in some places and users in others, depending on the Python version. This affected:

• custom key= cache keys (Python 3.11+),
• key registry set names ck:reg:<namespace>:<hash> (Python 3.11+),
• log-message prefixes (Python 3.11+),
• the namespace metrics label (all versions).

Plain str and StrEnum namespaces are unaffected.

Changes

src/cachekit/decorators/wrapper.py — create_cache_wrapper

• Namespace normalization: a str namespace is rebound to its exact value at the start of wrapper creation, before interop validation, the reserved-namespace check, and registry naming.
• Reserved-namespace check hardened: the "ck" / "ck:*" check now runs against the exact value. A subclass that overrides __eq__ or startswith can no longer bypass it, and a subclass that overrides __format__ can no longer forge a ck:reg: key shape.
• Legacy registry drain: the pre-fix f-string rendering is kept as _legacy_registry_id. It is set only when it differs from the normalized value and interop is not in use; interop already used an exact-str rebind when the registry shipped in 0.20.0.
  • A no-args invalidate_cache() / ainvalidate_cache() drain now also empties the legacy set, so entries tracked before the upgrade are still invalidated.
  • The code comment states that this fallback should be removed only in a major release that declares upgrades from 0.20.x unsupported.

No public signatures changed. The observable effects are the key, registry-name, log-prefix and metrics-label values for (str, Enum) namespaces.

docs/features/l1-invalidation.md

Adds a "str subclass namespaces" section covering upgrade impact for (str, Enum) namespaces:

• Custom key= entries relocate from NS.USERS:k to users:k, so each distinct key is recomputed once. The section covers clean-up via no-args invalidation or a scan_iter + unlink script, and the tenant-prefix patterns to use.
• Registry set rename and the dual-set drain behavior.
• Rolling deploys and rollbacks can leave stale entries. The recommended remediation is one no-args invalidate_cache() per tenant from an upgraded process.
• Observability: the metrics label changes on all Python versions, and the log prefix changes on 3.11+.

tests/unit/test_key_registry.py

Adds TestNamespaceExactStr, which covers:

• the registry ID and custom key using the enum value;
• __format__ overrides being unable to forge the registry shape;
• __eq__ / startswith overrides being unable to bypass the ck reservation;
• the no-args drain emptying the pre-fix registry set;
• a parametrized check that a second drain happens only when the set name actually changed. This is version-aware: 3.11+ versus 3.10, and interop is excluded.

---

This PR isolates the legacy key registry drain in invalidate_cache() so that its failure cannot discard the result of the primary drain.

Summary

On Python 3.11+, a (str, Enum) namespace's key registry set was renamed from ck:reg:NS.USERS:… to ck:reg:users:…. For functions that take parameters, a no-args invalidate_cache() drains both the new set and the legacy set. Previously, both drains ran in the same try block. If the legacy drain raised, the primary drain's results were thrown away, even though its keys had already been deleted from the backend. Other wrappers could then keep serving those keys from the shared L1 cache.

Changes

• src/cachekit/decorators/wrapper.py (_drain_all inside the cache wrapper): the legacy drain_tracked call now has its own try/except.
  • If it fails, a WARNING Legacy key registry drain failed: <redacted error> is logged.
  • The primary drain's deleted keys are still used to trim tracked keys and evict entries from the shared L1.
  • The legacy set's members stay in the backend, so the next no-args invalidate_cache() retries them.
  • The general fallback path (invalidating local keys only) no longer triggers because of a legacy-only failure.
• docs/features/l1-invalidation.md: the "key registry set is renamed" upgrade note now describes the new WARNING and states that the legacy set is kept and retried on the next no-args invalidation.
• tests/unit/test_key_registry.py: adds test_legacy_drain_failure_still_applies_primary_drain. With a backend whose legacy drain raises BackendError, the test checks that:
  • the warning is logged and the local-only fallback is not;
  • the legacy set is still present;
  • another wrapper's shared L1 copy was evicted, so the next call recomputes.

Public API impact

• No signatures change.
• The behavior of invalidate_cache() (no-args, on functions with parameters) changes only when the legacy drain fails: it becomes more resilient and logs a new WARNING message.

---

This PR contains a documentation-only change to docs/features/l1-invalidation.md. No code or public APIs are modified in this diff.

Summary

It clarifies how the key registry set for (str, Enum) namespaces is renamed on Python 3.11+, from ck:reg:NS.USERS:… to ck:reg:users:…. The change covers what happens when draining the legacy registry set fails during a no-args invalidate_cache().

Changes

In the "The key registry set is renamed (Python 3.11+)" bullet:

• Narrowed retention statement: After a failed legacy drain, only the old set's entries that the failed drain had not yet deleted remain in the set for the next no-args invalidate_cache(). Previously the text implied that all of the old set's entries stay.
• Added partial-failure caveat: For registry sets larger than 10 000 keys, a drain that fails part-way has already deleted some keys from L2. Other wrappers of the same function in the same process may keep serving their L1 copies of those keys until the L1 TTL expires. This matches the existing behavior when the new set's drain fails.

Affected Public APIs

• None modified. The documentation describes existing behavior of invalidate_cache() (no-args form) and the Legacy key registry drain failed WARNING log.

Summary by CodeRabbit

• Bug Fixes
  • Cache namespaces based on str subclasses now consistently use their underlying string value for cache keys and registry names.
  • Invalidation handles legacy registry entries after namespace naming changes, while preserving existing interop behaviour. If processing a legacy registry fails, the main invalidation can still complete.
• Documentation
  • Clarified namespace handling and upgrade or rollback effects, including which parameterised and zero-parameter cache entries can be invalidated, how long others may remain, and when Redis cleanup may be needed.

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---

Walkthrough

String-subclass namespaces now use their exact string value for cache keys and registry IDs. Whole-function invalidation also drains a recorded legacy registry ID. The documentation describes upgrade and rollback effects for (str, Enum) namespaces.

Changes

Namespace handling

Layer / File(s)	Summary
Namespace normalisation and registry IDs src/cachekit/decorators/wrapper.py, tests/unit/test_key_registry.py	The wrapper normalises string namespaces before validation and key generation. Registry IDs use the normalised value. Tests cover customised string behaviour, reserved ck namespaces and custom keys.
Legacy registry cleanup and upgrade guidance src/cachekit/decorators/wrapper.py, tests/unit/test_key_registry.py, docs/features/l1-invalidation.md	Whole-function invalidation also drains a recorded legacy registry ID. Tests cover legacy drain success and failure, and cases where the registry name moved. The documentation describes upgrade and rollback effects and Redis cleanup patterns.

Priority: ⬇️ Low

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

Change: Bug fix

Merge Risk: ⚪ Minimal · up to db76a

The change consistently uses underlying string namespaces and preserves legacy registry cleanup. No concrete merge-blocking risk remains in the supplied evidence; normal checks should pass before merging.

Security Architecture Review

Security architecture risk: 🔵 Low · up to db76a

String-subclass namespaces now behave consistently and reserved names are checked more reliably. Affected applications still need coordinated upgrades and cleanup to avoid key collisions or stale cached data.

Retained concerns

• Low · security · inferred: On affected Python versions, a string-subclass namespace can newly converge with an existing plain-string namespace. Custom keys contain no function identifier, so identical custom-key values can then address the same cached data. This is a configuration-dependent migration risk, not a verified attacker-reachable vulnerability.
• Low · reliability · observed: Mixed-version deployments and rollback can leave affected entries outside the invalidating process's registry or key spelling. Old custom-key entries can become readable again after rollback, and missed entries without a TTL can persist indefinitely. The documented per-tenant cleanup mitigates this gap but requires operational coordination.

Security review details

Security Blast Radius

• inferred — The demonstrated migration exposure concerns affected namespaces sharing cache storage. In the examined tenant-scoped Redis implementation, registry and member deletion remain within the caller's tenant prefix. Equivalent guarantees for other backend implementations depend on their existing contracts.

Security Findings and Attack Paths

• inferred — The supported aliasing path requires application configuration to select namespaces whose previous rendering differed from their underlying value. Custom-key values can derive from call arguments, but the examined change does not establish request-controlled namespace selection or a verified privilege-escalation path.

Trust Boundaries and Controls

• observed — The current and legacy registry identifiers retain the same module-and-qualified-function hash. Tenant prefixing remains backend-owned, and interop mode does not receive a legacy registry drain because its existing validation already canonicalized namespace strings.

Resilience and Maintainability Implications

• observed — A partially failed legacy drain can delete L2 entries without returning their keys for shared-L1 eviction. Other wrappers may therefore serve those L1 copies until expiry. The documentation identifies this as the same limitation already present for primary-drain failures, not a newly introduced failure mode.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 23.81% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 21 functions across 2 files. (1 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: normalising str namespace values for registry keys and names. It is concise and specific.
Description check	✅ Passed	The description provides detailed motivation, behaviour changes, upgrade impact, documentation updates, tests, and backward-compatibility information. It does not follow the template fully and contain…
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.

Full details: Docstring Coverage

Explanation

Docstring coverage is 23.81% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 21 functions across 2 files. (1 skipped: 1 unsupported.)

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---

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Inline comments:
Review comments at @src/cachekit/decorators/wrapper.py:
- Around line 2358-2359: Handle the current and legacy drains independently in
the drain flow near `_legacy_registry_id`: retain any keys returned by a
successful drain if the other drain raises, then pass those keys to
`_l1_cache.invalidate_many(deleted | ...)`. Keep `_local_invalidate_all()` as
the fallback when both drains fail, without letting one drain’s exception
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Kody Guide: Usage and Configuration

Interacting with Kody

• 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.

[kodus-27b]

Code Review Completed! 🔥

The code review was successfully completed based on your current configurations.

Kody Guide: Usage and Configuration

Interacting with Kody

• 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.

[27Bslash6]

@coderabbitai review

[coderabbitai]

✅ Action performed

Review finished.

Note: CodeRabbit is an incremental review system and does not re-review already reviewed commits. This command is applicable only when automatic reviews are paused.