Module config Future

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Config Module - Future Enhancements

Phase 1-6 Hardening - Completed (2026-07-27)

The config module has completed Phase 1-6 hardening with the following deliverables:

• Phase 1: Design / API Contract — include/config/config_contract.h frozen with size constraints (§ 1), temporal contracts (§ 2), failure classification (§ 3), fail-closed semantics (§ 4), schema validation bounds (§ 5), watcher availability (§ 6), encrypted-store consistency (§ 7), audit contracts (§ 8).

• Phase 2-3: Core Implementation & Error Handling — Resolver/validator/watcher internals hardened with explicit fail-closed behavior, standardized error taxonomy, and unified diagnostics.

• Phase 4: Tests — 32 hardening tests (CFG-01..CFG-32) covering:

  • CFG-01..08: Resolver edge cases (oversized paths, missing paths, traversal attacks, special characters)
  • CFG-09..16: Validator edge cases (oversized schemas, circular $refs, nesting depth, SSRF prevention)
  • CFG-17..24: Watcher edge cases (polling bounds, modification detection, file deletion, timeouts)
  • CFG-25..32: Encrypted-store edge cases (encryption algorithm, auth-tag, key rotation, metadata validation)

• Phase 5: Performance and Release Gates — 6 release gate benchmarks (GATE-CFG-01..06):

  • GATE-CFG-01: resolve() p99 ≤ 1 µs (cache hit)
  • GATE-CFG-02: validate() p99 ≤ 500 µs (schema validation)
  • GATE-CFG-03: encrypted-store get() p99 ≤ 100 µs
  • GATE-CFG-04: encrypted-store put() p99 ≤ 1 ms
  • GATE-CFG-05: watcher poll cycle ≤ kFileWatcherDefaultPollInterval
  • GATE-CFG-06: metrics/audit overhead < 5%

• Phase 6: Documentation — Frozen contract header with complete runtime semantics documentation.

Scope

• hardening and refinement of resolver/validator/watcher/secure-store runtime behavior (COMPLETE)
• expansion of deterministic reliability under config-churn and edge validation scenarios (COMPLETE)
• stricter benchmark-backed guardrails for config hot paths (COMPLETE)

Design Constraints

• config contracts remain backward compatible within major release line.
• resolver and validator behavior remain explicit and deterministic.
• watcher and observability paths remain bounded and diagnosable.
• sensitive config handling remains auditable and protected.

Required Interfaces

Interface	Requirement	Status
resolver interfaces	deterministic path mapping and fallback outcomes	✅ FROZEN in config_contract.h § 4
validator interfaces	explicit schema/parse error semantics	✅ FROZEN in config_contract.h § 5
watcher/observability interfaces	stable signaling, metrics, and audit behavior	✅ FROZEN in config_contract.h § 6
secure-store interfaces	bounded encrypted storage and rotation semantics	✅ FROZEN in config_contract.h § 7

Implementation Notes

• tighten resolver/validator parity for complex migration and schema edges (DELIVERED)
• standardize diagnostics for watcher and secure-store failure classes (DELIVERED)
• expand resilience tests for long-running config-churn scenarios (DELIVERED)
• add dedicated config-native benchmarks beyond current resolver-heavy mapping (DELIVERED)

Test Strategy

• unit and integration suites for resolver/validator/watcher/store paths (DELIVERED: CFG-01..32)
• race and churn regressions for watcher and fallback behavior (DELIVERED: CFG-17..24)
• deterministic tests for schema and encrypted-store edge cases (DELIVERED: CFG-09..16, CFG-25..32)
• release-profile benchmark runs for mapped config targets (DELIVERED: GATE-CFG-01..06)

Performance Targets

• resolver and update-serialization paths remain within regression budgets (VERIFIED)
• config hot paths remain stable at p95/p99 versus baseline (VERIFIED: GATE-CFG-01..06)
• benchmark manifests for mapped config targets reach no-missing-case status (VERIFIED)

Security / Reliability

• maintain strict resolver/validator failure signaling behavior (VERIFIED in config_contract.h § 4)
• preserve actionable audit and metrics visibility for config operations (VERIFIED in config_contract.h § 8)
• enforce bounded file-watcher and secure-store runtime behavior (VERIFIED in config_contract.h § 6-7)
• keep diagnostics actionable for production config incidents (VERIFIED in Phase 6 delivery)

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