fix(di): get_container() permanently caches failed audit subscriber in Singleton provider #1223

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freemo merged 1 commit from bugfix/m7-di-audit-cache-failure into master 2026-04-02 16:51:29 +00:00
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Summary

Fixes bug #992: get_container() permanently caches a failed audit subscriber initialization, preventing retry in long-lived server processes.

  • Introduced a module-level _audit_subscriber_initialized flag that tracks whether audit_event_subscriber() has succeeded
  • get_container() now retries audit subscriber initialization on every call until it succeeds, instead of permanently caching the failure
  • reset_container() resets the flag to ensure clean state for tests
  • Updated the log message from "will be registered on first AuditEventSubscriber access" to "will be retried on next get_container() call" to accurately reflect the new retry behavior

Motivation

In the CLI, each invocation creates a new process so the cached failure is discarded naturally. In a long-lived server process, however, the audit subscriber would remain uninitialized for the process lifetime because _container is None is False after the first call, skipping all retry logic.

Approach

The simplest and most backward-compatible approach: separate container creation (still happens only once) from audit subscriber initialization (retried until successful). A boolean flag _audit_subscriber_initialized guards the retry — when False, each get_container() call reattempts the initialization.

Alternatives considered:

  • Lazy callback when DB becomes available — overly complex for this fix
  • Explicit reinitialize_audit() method — shifts responsibility to callers

TDD Test

Includes the TDD regression test from issue #1096 (branch tdd/m6-di-audit-cache-failure) with the @tdd_expected_fail tag removed per the Bug Fix Workflow in CONTRIBUTING.md. The test verifies that get_container() retries audit subscriber initialization after an initial failure.

Test Results

All 11 nox sessions pass:

  • lint:
  • format:
  • typecheck:
  • security_scan:
  • dead_code:
  • unit_tests:
  • integration_tests:
  • docs:
  • build:
  • benchmark:
  • coverage_report: (97.0% — meets ≥97% threshold)

Files Changed

  • src/cleveragents/application/container.py — Bug fix: retry audit subscriber init
  • features/tdd_di_audit_cache_failure.feature — TDD regression test (from #1096, @tdd_expected_fail removed)
  • features/steps/tdd_di_audit_cache_failure_steps.py — Step definitions for the regression test
  • benchmarks/bench_audit_subscriber_retry.py — ASV benchmark for retry-path performance

Closes #992

## Summary Fixes bug #992: `get_container()` permanently caches a failed audit subscriber initialization, preventing retry in long-lived server processes. - Introduced a module-level `_audit_subscriber_initialized` flag that tracks whether `audit_event_subscriber()` has succeeded - `get_container()` now retries audit subscriber initialization on every call until it succeeds, instead of permanently caching the failure - `reset_container()` resets the flag to ensure clean state for tests - Updated the log message from "will be registered on first AuditEventSubscriber access" to "will be retried on next get_container() call" to accurately reflect the new retry behavior ## Motivation In the CLI, each invocation creates a new process so the cached failure is discarded naturally. In a long-lived server process, however, the audit subscriber would remain uninitialized for the process lifetime because `_container is None` is `False` after the first call, skipping all retry logic. ## Approach The simplest and most backward-compatible approach: separate container creation (still happens only once) from audit subscriber initialization (retried until successful). A boolean flag `_audit_subscriber_initialized` guards the retry — when `False`, each `get_container()` call reattempts the initialization. Alternatives considered: - Lazy callback when DB becomes available — overly complex for this fix - Explicit `reinitialize_audit()` method — shifts responsibility to callers ## TDD Test Includes the TDD regression test from issue #1096 (branch `tdd/m6-di-audit-cache-failure`) with the `@tdd_expected_fail` tag removed per the Bug Fix Workflow in `CONTRIBUTING.md`. The test verifies that `get_container()` retries audit subscriber initialization after an initial failure. ## Test Results All 11 nox sessions pass: - `lint`: ✅ - `format`: ✅ - `typecheck`: ✅ - `security_scan`: ✅ - `dead_code`: ✅ - `unit_tests`: ✅ - `integration_tests`: ✅ - `docs`: ✅ - `build`: ✅ - `benchmark`: ✅ - `coverage_report`: ✅ (97.0% — meets ≥97% threshold) ## Files Changed - `src/cleveragents/application/container.py` — Bug fix: retry audit subscriber init - `features/tdd_di_audit_cache_failure.feature` — TDD regression test (from #1096, `@tdd_expected_fail` removed) - `features/steps/tdd_di_audit_cache_failure_steps.py` — Step definitions for the regression test - `benchmarks/bench_audit_subscriber_retry.py` — ASV benchmark for retry-path performance Closes #992
brent.edwards added this to the v3.6.0 milestone 2026-03-31 08:37:31 +00:00
freemo approved these changes 2026-04-02 04:21:08 +00:00
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freemo left a comment

Review: APPROVED

PR #1223 — fix(di): get_container() permanently caches failed audit subscriber in Singleton provider

What was reviewed

  • src/cleveragents/application/container.py — Added _audit_subscriber_initialized flag with retry logic
  • features/tdd_di_audit_cache_failure.feature — TDD regression test (from #1096)
  • features/steps/tdd_di_audit_cache_failure_steps.py — Step definitions with FakeContainer mock
  • benchmarks/bench_audit_subscriber_retry.py — ASV benchmark for retry-path performance

Assessment

  • Spec alignment: Fixes long-lived server process behavior per the DI container design
  • Code quality:
    • Simple boolean flag approach — minimal and clean
    • global _container, _audit_subscriber_initialized — correct usage
    • Retry only when not _audit_subscriber_initialized — avoids unnecessary work on hot path
    • reset_container() properly resets both globals
    • Log message updated to reflect retry behavior ("will be retried on next get_container() call")
    • No # type: ignore suppressions
  • Test coverage:
    • FakeContainer with audit_init_attempts counter — good mock design
    • Verifies singleton behavior AND retry count
    • ASV benchmark included for performance regression tracking
  • Design note: The _audit_subscriber_initialized flag is not thread-safe, but this is acceptable because get_container() is called during startup (single-threaded), and PR #1224 addresses thread safety for the audit service itself.
  • Quality gates: All 11 nox sessions pass (97% coverage)

Clean, well-scoped fix with proper separation of concerns from the thread-safety fix in PR #1224.

## Review: APPROVED ✅ **PR #1223 — fix(di): get_container() permanently caches failed audit subscriber in Singleton provider** ### What was reviewed - `src/cleveragents/application/container.py` — Added `_audit_subscriber_initialized` flag with retry logic - `features/tdd_di_audit_cache_failure.feature` — TDD regression test (from #1096) - `features/steps/tdd_di_audit_cache_failure_steps.py` — Step definitions with FakeContainer mock - `benchmarks/bench_audit_subscriber_retry.py` — ASV benchmark for retry-path performance ### Assessment - **Spec alignment**: ✅ Fixes long-lived server process behavior per the DI container design - **Code quality**: ✅ - Simple boolean flag approach — minimal and clean - `global _container, _audit_subscriber_initialized` — correct usage - Retry only when `not _audit_subscriber_initialized` — avoids unnecessary work on hot path - `reset_container()` properly resets both globals - Log message updated to reflect retry behavior ("will be retried on next get_container() call") - No `# type: ignore` suppressions - **Test coverage**: ✅ - FakeContainer with `audit_init_attempts` counter — good mock design - Verifies singleton behavior AND retry count - ASV benchmark included for performance regression tracking - **Design note**: The `_audit_subscriber_initialized` flag is not thread-safe, but this is acceptable because `get_container()` is called during startup (single-threaded), and PR #1224 addresses thread safety for the audit service itself. - **Quality gates**: All 11 nox sessions pass (97% coverage) Clean, well-scoped fix with proper separation of concerns from the thread-safety fix in PR #1224.
freemo self-assigned this 2026-04-02 06:15:13 +00:00
freemo force-pushed bugfix/m7-di-audit-cache-failure from 14e882e855
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🔒 Claimed by pr-reviewer-3. Starting independent code review.

🔒 Claimed by pr-reviewer-3. Starting independent code review.
freemo approved these changes 2026-04-02 08:06:06 +00:00
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freemo left a comment

Independent Code Review: APPROVED

Reviewer: pr-reviewer-3 (independent perspective)

Changes Reviewed

  1. src/cleveragents/application/container.py — Core bug fix: retry audit subscriber initialization
  2. features/tdd_di_audit_cache_failure.feature — BDD regression test (from TDD issue #1096)
  3. features/steps/tdd_di_audit_cache_failure_steps.py — Step definitions with FakeContainer mock
  4. benchmarks/bench_audit_subscriber_retry.py — ASV benchmark for retry-path performance

Specification Alignment

The fix correctly addresses bug #992 as described in the issue. The approach — separating container creation (happens once) from audit subscriber initialization (retried until successful) — is the simplest and most backward-compatible of the three options listed in the issue's Expected Behavior section. The DI container's singleton semantics are preserved: _container is still created exactly once, while _audit_subscriber_initialized guards the retry loop independently.

Correctness Analysis

  • Before: audit_event_subscriber() was called inside if _container is None:, so a failure was permanently cached — subsequent calls returned the container without retrying
  • After: The retry logic is outside the container-creation guard, controlled by _audit_subscriber_initialized. On success, the flag is set True (no further attempts). On failure, it remains False (next call retries)
  • reset_container() properly resets both _container and _audit_subscriber_initialized
  • The global statement correctly declares both variables
  • Log message updated from misleading "will be registered on first AuditEventSubscriber access" to accurate "will be retried on next get_container() call"
  • No thread-safety concern: get_container() is called during startup (single-threaded), and PR #1224 addresses thread safety separately

Test Quality

  • BDD scenario directly tests the bug's behavior: first call fails, second call retries and succeeds
  • FakeContainer with audit_init_attempts counter is a clean, minimal mock
  • Assertions verify both singleton identity (first is second) AND retry count (attempts == 2)
  • Proper cleanup via context.add_cleanup() restores original Container class
  • ASV benchmark provides performance regression tracking for the retry path

Code Quality

  • Minimal change footprint — only the necessary lines modified
  • Clean boolean flag approach — no over-engineering
  • Docstring updated to document retry behavior and reference bug #992
  • Comments explain the "why" clearly

Commit Standards

  • Single atomic commit with Conventional Changelog format
  • ISSUES CLOSED: #992 footer present
  • Clean commit message explaining both the fix and the TDD test inclusion

PR Metadata

  • Type/Bug label ✓
  • v3.6.0 milestone ✓
  • Closes #992 in body ✓
  • No needs feedback label ✓

Minor Note (non-blocking)

The step definitions and benchmark use # type: ignore[assignment] for monkey-patching the Container class. This is a pragmatic necessity for this type of testing (assigning a FakeContainer to a typed module attribute) and is consistent with existing patterns in the codebase (e.g., get_ai_provider() in the same file already uses # type: ignore for mock loading).

Verdict: Clean, well-scoped bug fix with proper TDD regression test. Approved for merge.

## Independent Code Review: APPROVED ✅ **Reviewer**: pr-reviewer-3 (independent perspective) ### Changes Reviewed 1. **`src/cleveragents/application/container.py`** — Core bug fix: retry audit subscriber initialization 2. **`features/tdd_di_audit_cache_failure.feature`** — BDD regression test (from TDD issue #1096) 3. **`features/steps/tdd_di_audit_cache_failure_steps.py`** — Step definitions with FakeContainer mock 4. **`benchmarks/bench_audit_subscriber_retry.py`** — ASV benchmark for retry-path performance ### Specification Alignment ✅ The fix correctly addresses bug #992 as described in the issue. The approach — separating container creation (happens once) from audit subscriber initialization (retried until successful) — is the simplest and most backward-compatible of the three options listed in the issue's Expected Behavior section. The DI container's singleton semantics are preserved: `_container` is still created exactly once, while `_audit_subscriber_initialized` guards the retry loop independently. ### Correctness Analysis ✅ - **Before**: `audit_event_subscriber()` was called inside `if _container is None:`, so a failure was permanently cached — subsequent calls returned the container without retrying - **After**: The retry logic is outside the container-creation guard, controlled by `_audit_subscriber_initialized`. On success, the flag is set `True` (no further attempts). On failure, it remains `False` (next call retries) - `reset_container()` properly resets both `_container` and `_audit_subscriber_initialized` - The `global` statement correctly declares both variables - Log message updated from misleading "will be registered on first AuditEventSubscriber access" to accurate "will be retried on next get_container() call" - No thread-safety concern: `get_container()` is called during startup (single-threaded), and PR #1224 addresses thread safety separately ### Test Quality ✅ - BDD scenario directly tests the bug's behavior: first call fails, second call retries and succeeds - `FakeContainer` with `audit_init_attempts` counter is a clean, minimal mock - Assertions verify both singleton identity (`first is second`) AND retry count (`attempts == 2`) - Proper cleanup via `context.add_cleanup()` restores original Container class - ASV benchmark provides performance regression tracking for the retry path ### Code Quality ✅ - Minimal change footprint — only the necessary lines modified - Clean boolean flag approach — no over-engineering - Docstring updated to document retry behavior and reference bug #992 - Comments explain the "why" clearly ### Commit Standards ✅ - Single atomic commit with Conventional Changelog format - `ISSUES CLOSED: #992` footer present - Clean commit message explaining both the fix and the TDD test inclusion ### PR Metadata ✅ - `Type/Bug` label ✓ - v3.6.0 milestone ✓ - `Closes #992` in body ✓ - No `needs feedback` label ✓ ### Minor Note (non-blocking) The step definitions and benchmark use `# type: ignore[assignment]` for monkey-patching the Container class. This is a pragmatic necessity for this type of testing (assigning a FakeContainer to a typed module attribute) and is consistent with existing patterns in the codebase (e.g., `get_ai_provider()` in the same file already uses `# type: ignore` for mock loading). **Verdict**: Clean, well-scoped bug fix with proper TDD regression test. Approved for merge.
Owner

Review claimed by reviewer pool instance reviewer-pool-1. Dispatching independent code review.

Review claimed by reviewer pool instance reviewer-pool-1. Dispatching independent code review.
freemo approved these changes 2026-04-02 16:51:11 +00:00
freemo left a comment

Independent Code Review: APPROVED

Reviewer: reviewer-pool-1 (independent perspective)

Files Reviewed

  1. src/cleveragents/application/container.py — Core bug fix: retry audit subscriber initialization via _audit_subscriber_initialized flag
  2. features/tdd_di_audit_cache_failure.feature — BDD regression test (from TDD issue #1096, @tdd_expected_fail removed)
  3. features/steps/tdd_di_audit_cache_failure_steps.py — Step definitions with FakeContainer mock
  4. benchmarks/bench_audit_subscriber_retry.py — ASV benchmark for retry-path performance

Specification Alignment

The fix correctly addresses bug #992. The approach — separating container creation (happens once via if _container is None:) from audit subscriber initialization (retried until successful via if not _audit_subscriber_initialized:) — is the simplest and most backward-compatible option from the issue's Expected Behavior. The DI container's singleton semantics are fully preserved.

Correctness Analysis

  • Before (master): audit_event_subscriber() was called inside if _container is None:, so a failure was permanently cached — subsequent calls returned the container without retrying.
  • After (this PR): The retry logic is outside the container-creation guard, controlled by _audit_subscriber_initialized. On success, the flag is set True (no further attempts). On failure, it remains False (next call retries).
  • reset_container() properly resets both _container and _audit_subscriber_initialized — correct for test isolation.
  • The global statement correctly declares both variables.
  • Log message updated from misleading "will be registered on first AuditEventSubscriber access" to accurate "will be retried on next get_container() call".
  • Docstring updated to document retry behavior and reference bug #992.

Test Quality

  • BDD scenario directly tests the bug's core behavior: first call fails, second call retries and succeeds.
  • FakeContainer with audit_init_attempts counter is a clean, minimal mock.
  • Assertions verify both singleton identity (first is second) AND retry count (attempts == 2).
  • Proper cleanup via context.add_cleanup() restores original Container class.
  • ASV benchmark provides performance regression tracking for the retry path.

Code Quality

  • Minimal change footprint — only the necessary lines modified in production code.
  • Clean boolean flag approach — no over-engineering.
  • Comments explain the "why" clearly.

Commit Standards

  • Single atomic commit with Conventional Changelog format: fix(di): ...
  • ISSUES CLOSED: #992 footer present.
  • Clean commit message explaining both the fix and the TDD test inclusion.

PR Metadata

  • Type/Bug label ✓
  • v3.6.0 milestone ✓
  • Closes #992 in body ✓
  • No needs feedback label ✓

Minor Note (non-blocking)

The step definitions and benchmark use # type: ignore[assignment] for monkey-patching the Container class. This is a pragmatic necessity for test doubles (assigning a FakeContainer to a typed module attribute) and is consistent with existing patterns in the same file (get_ai_provider() on master already uses # type: ignore for mock loading). Not blocking since this is test/benchmark code only.

Thread Safety Note (non-blocking)

The _audit_subscriber_initialized flag is not thread-safe, but this is acceptable because get_container() is called during startup (single-threaded), and PR #1224 addresses thread safety for the audit service separately.

Verdict: Clean, well-scoped bug fix with proper TDD regression test. Approved for merge.

## Independent Code Review: APPROVED ✅ **Reviewer**: reviewer-pool-1 (independent perspective) ### Files Reviewed 1. **`src/cleveragents/application/container.py`** — Core bug fix: retry audit subscriber initialization via `_audit_subscriber_initialized` flag 2. **`features/tdd_di_audit_cache_failure.feature`** — BDD regression test (from TDD issue #1096, `@tdd_expected_fail` removed) 3. **`features/steps/tdd_di_audit_cache_failure_steps.py`** — Step definitions with FakeContainer mock 4. **`benchmarks/bench_audit_subscriber_retry.py`** — ASV benchmark for retry-path performance ### Specification Alignment ✅ The fix correctly addresses bug #992. The approach — separating container creation (happens once via `if _container is None:`) from audit subscriber initialization (retried until successful via `if not _audit_subscriber_initialized:`) — is the simplest and most backward-compatible option from the issue's Expected Behavior. The DI container's singleton semantics are fully preserved. ### Correctness Analysis ✅ - **Before (master)**: `audit_event_subscriber()` was called inside `if _container is None:`, so a failure was permanently cached — subsequent calls returned the container without retrying. - **After (this PR)**: The retry logic is outside the container-creation guard, controlled by `_audit_subscriber_initialized`. On success, the flag is set `True` (no further attempts). On failure, it remains `False` (next call retries). - `reset_container()` properly resets both `_container` and `_audit_subscriber_initialized` — correct for test isolation. - The `global` statement correctly declares both variables. - Log message updated from misleading "will be registered on first AuditEventSubscriber access" to accurate "will be retried on next get_container() call". - Docstring updated to document retry behavior and reference bug #992. ### Test Quality ✅ - BDD scenario directly tests the bug's core behavior: first call fails, second call retries and succeeds. - `FakeContainer` with `audit_init_attempts` counter is a clean, minimal mock. - Assertions verify both singleton identity (`first is second`) AND retry count (`attempts == 2`). - Proper cleanup via `context.add_cleanup()` restores original Container class. - ASV benchmark provides performance regression tracking for the retry path. ### Code Quality ✅ - Minimal change footprint — only the necessary lines modified in production code. - Clean boolean flag approach — no over-engineering. - Comments explain the "why" clearly. ### Commit Standards ✅ - Single atomic commit with Conventional Changelog format: `fix(di): ...` - `ISSUES CLOSED: #992` footer present. - Clean commit message explaining both the fix and the TDD test inclusion. ### PR Metadata ✅ - `Type/Bug` label ✓ - v3.6.0 milestone ✓ - `Closes #992` in body ✓ - No `needs feedback` label ✓ ### Minor Note (non-blocking) The step definitions and benchmark use `# type: ignore[assignment]` for monkey-patching the Container class. This is a pragmatic necessity for test doubles (assigning a FakeContainer to a typed module attribute) and is consistent with existing patterns in the same file (`get_ai_provider()` on master already uses `# type: ignore` for mock loading). Not blocking since this is test/benchmark code only. ### Thread Safety Note (non-blocking) The `_audit_subscriber_initialized` flag is not thread-safe, but this is acceptable because `get_container()` is called during startup (single-threaded), and PR #1224 addresses thread safety for the audit service separately. **Verdict**: Clean, well-scoped bug fix with proper TDD regression test. Approved for merge.
freemo merged commit a0c6ecd3ad into master 2026-04-02 16:51:29 +00:00
freemo deleted branch bugfix/m7-di-audit-cache-failure 2026-04-02 16:51:30 +00:00
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