feat(concurrency): add plan and project locks #327

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opened 2026-02-22 23:41:19 +00:00 by freemo · 3 comments
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Metadata

  • Commit Message: feat(concurrency): add plan and project locks
  • Branch: feature/m4-concurrency-locks

Background

Plan-level and project-level locks are implemented with timeouts. A locks table stores lock metadata (owner_id, resource_type, resource_id, acquired_at, expires_at). Locks are enforced in PlanLifecycleService transitions and SubplanService scheduling.

Acceptance Criteria

  • Implement plan-level and project-level locks with timeouts.
  • Add locks table with owner_id, resource_type, resource_id, acquired_at, expires_at.
  • Ensure locks are enforced in PlanLifecycleService transitions and SubplanService scheduling.
  • Add lock renewal for long-running phases and release locks on graceful shutdown.
  • Allow re-entrant lock acquisition for the same owner and reject conflicting owners with explicit error.

Definition of Done

This issue is complete when:

  • All subtasks below are completed and checked off.
  • A Git commit is created where the first line of the commit message matches
    the Commit Message in Metadata exactly, followed by a blank line, then
    additional lines providing relevant details about the implementation. The
    commit body should be appropriate in size for a commit message and relatively
    complete in describing what was done.
  • The commit is pushed to the remote on the branch matching the Branch in
    Metadata exactly.
  • The commit is submitted as a pull request to master, reviewed, and
    merged before this issue is marked done.

Subtasks

  • Implement plan-level and project-level locks with timeouts.
  • Add locks table with owner_id, resource_type, resource_id, acquired_at, expires_at.
  • Ensure locks are enforced in PlanLifecycleService transitions and SubplanService scheduling.
  • Add lock renewal for long-running phases and release locks on graceful shutdown.
  • Allow re-entrant lock acquisition for the same owner and reject conflicting owners with explicit error.
  • Add lock cleanup routine to purge expired locks on startup.
  • Add agents diagnostics check to report stale locks count.
  • Add docs/reference/concurrency.md with lock behavior.
  • Document lock TTL defaults and renewal strategy.
  • Tests (Behave): Add features/concurrency.feature scenarios for lock contention and expiry.
  • Tests (Robot): Add lock integration smoke tests.
  • Tests (ASV): Add benchmarks/concurrency_lock_bench.py for lock overhead baseline.
  • Verify coverage >=97% via nox -s coverage_report. If coverage is <97% then review the current unit test coverage report at build/coverage.xml and use it to write new Behave based unit tests to improve code coverage. Specifically, write Behave style unit tests that are descriptively named and specifically improves coverage on whichever file has the most uncovered lines by writing tests that will target the uncovered lines in the report. Once that is done rerun nox -s coverage_report to verify all tests pass and coverage is above >=97%. Only mark this as complete once coverage is >=97%, if not repeat this task as many times as is needed until coverage reaches >=97%.
  • Run nox (all default sessions, including benchmark), fix any errors if needed ensuring nox passes across entire code base, do not ignore any failure even if it seems unrelated to this commit, fix it.

Section: ### Section 14: Concurrency & Cleanup [Days 12-14]
Status: Open

## Metadata - **Commit Message**: `feat(concurrency): add plan and project locks` - **Branch**: `feature/m4-concurrency-locks` ## Background Plan-level and project-level locks are implemented with timeouts. A `locks` table stores lock metadata (owner_id, resource_type, resource_id, acquired_at, expires_at). Locks are enforced in PlanLifecycleService transitions and SubplanService scheduling. ## Acceptance Criteria - [ ] Implement plan-level and project-level locks with timeouts. - [ ] Add `locks` table with owner_id, resource_type, resource_id, acquired_at, expires_at. - [ ] Ensure locks are enforced in PlanLifecycleService transitions and SubplanService scheduling. - [ ] Add lock renewal for long-running phases and release locks on graceful shutdown. - [ ] Allow re-entrant lock acquisition for the same owner and reject conflicting owners with explicit error. ## Definition of Done This issue is complete when: - All subtasks below are completed and checked off. - A Git commit is created where the **first line** of the commit message matches the Commit Message in Metadata exactly, followed by a blank line, then additional lines providing relevant details about the implementation. The commit body should be appropriate in size for a commit message and relatively complete in describing what was done. - The commit is pushed to the remote on the branch matching the **Branch** in Metadata exactly. - The commit is submitted as a **pull request** to `master`, reviewed, and **merged** before this issue is marked done. ## Subtasks - [ ] Implement plan-level and project-level locks with timeouts. - [ ] Add `locks` table with owner_id, resource_type, resource_id, acquired_at, expires_at. - [ ] Ensure locks are enforced in PlanLifecycleService transitions and SubplanService scheduling. - [ ] Add lock renewal for long-running phases and release locks on graceful shutdown. - [ ] Allow re-entrant lock acquisition for the same owner and reject conflicting owners with explicit error. - [ ] Add lock cleanup routine to purge expired locks on startup. - [ ] Add `agents diagnostics` check to report stale locks count. - [ ] Add `docs/reference/concurrency.md` with lock behavior. - [ ] Document lock TTL defaults and renewal strategy. - [ ] Tests (Behave): Add `features/concurrency.feature` scenarios for lock contention and expiry. - [ ] Tests (Robot): Add lock integration smoke tests. - [ ] Tests (ASV): Add `benchmarks/concurrency_lock_bench.py` for lock overhead baseline. - [ ] Verify coverage >=97% via `nox -s coverage_report`. If coverage is <97% then review the current unit test coverage report at `build/coverage.xml` and use it to write new Behave based unit tests to improve code coverage. Specifically, write Behave style unit tests that are descriptively named and specifically improves coverage on whichever file has the most uncovered lines by writing tests that will target the uncovered lines in the report. Once that is done rerun `nox -s coverage_report` to verify all tests pass and coverage is above >=97%. Only mark this as complete once coverage is >=97%, if not repeat this task as many times as is needed until coverage reaches >=97%. - [ ] Run `nox` (all default sessions, including benchmark), fix any errors if needed ensuring nox passes across **entire** code base, do not ignore any failure even if it seems unrelated to this commit, fix it. **Section**: ### Section 14: Concurrency & Cleanup [Days 12-14] **Status**: Open
freemo added this to the (deleted) milestone 2026-02-22 23:41:19 +00:00
freemo modified the milestone from (deleted) to v3.1.0 2026-02-23 00:07:06 +00:00
Author
Owner

Expected completion updated (Day 15 rebaseline): Day 35 / 2026-03-15 (previously Day 26 / 2026-03-06)

**Expected completion updated (Day 15 rebaseline):** Day 35 / 2026-03-15 (previously Day 26 / 2026-03-06)
freemo added the due date 2026-02-20 2026-02-23 18:41:52 +00:00
freemo self-assigned this 2026-02-24 21:53:10 +00:00
Author
Owner

Parent Epic: #365 (Decision System & Corrections)

Parent Epic: #365 (Decision System & Corrections)
Author
Owner

Implementation Summary

Commit: e6a6271 on branch feature/m4-concurrency-locks
PR: Forthcoming

What was implemented

  1. Alembic migration (m4_001_concurrency_locks) — Creates the locks table with columns: id, owner_id, resource_type, resource_id, acquired_at, expires_at, plus a unique constraint on (resource_type, resource_id) and indexes on owner_id and expires_at.

  2. LockModel — SQLAlchemy model added to models.py.

  3. Exception classesLockConflictError and LockExpiredError added to core/exceptions.py.

  4. LockService (application/services/lock_service.py, 455 lines) — Full implementation:

    • acquire() — Acquire lock with configurable TTL (default 300s for plans, 600s for projects). Re-entrant for same owner; raises LockConflictError for different owner.
    • release() — Release a specific lock by resource.
    • renew() — Extend lock TTL; raises LockExpiredError if lock has already expired.
    • release_all_for_owner() — Graceful shutdown: release all locks for an owner.
    • cleanup_expired() — Startup routine: purge all expired locks.
    • count_stale_locks() — Diagnostics: count locks past expiry.
    • is_locked() — Check if a resource is currently locked.
  5. Diagnostics_check_stale_locks() added to cli/commands/system.py for the agents diagnostics command.

  6. Documentationdocs/reference/concurrency.md covering lock behavior, TTL defaults, renewal strategy.

  7. Tests:

    • Behave: 25 scenarios in features/concurrency.feature (all passing) — covers acquisition, re-entrancy, conflict detection, renewal, expiry, cleanup, diagnostics, graceful shutdown, validation errors.
    • Robot: robot/concurrency_locks.robot integration smoke test (passing).
    • ASV: benchmarks/concurrency_lock_bench.py with 6 benchmark classes.
  8. Quality gates: nox -e lint, nox -e typecheck, nox -e format -- --check all pass.

What is NOT yet implemented

  • Subtask 3: Locks are not yet enforced in PlanLifecycleService transitions or SubplanService scheduling. The LockService exists standalone but is not wired into the DI container or called during plan state transitions.
  • Subtask 4: Lock renewal for long-running phases — the renew() method exists but is not yet invoked from phase execution code.
  • Coverage verification: The full nox -s coverage_report run could not complete because the entire unit test suite (287 feature files) hangs — this is a pre-existing issue also present on origin/master, not caused by this change.
  • Full nox run: Same hanging issue prevents nox from completing all default sessions.

Issues encountered

  • Pre-existing test suite hang: Running all 287 feature files together via nox -e unit_tests causes the test runner to hang indefinitely. This reproduces on origin/master as well. Individual feature files and small subsets run fine.
  • Behave step name collision: Had to rename the step "a validation error should be raised" to "a lock validation error should be raised" to avoid AmbiguousStep errors with an existing step in domain_models_steps.py.
## Implementation Summary **Commit**: `e6a6271` on branch `feature/m4-concurrency-locks` **PR**: Forthcoming ### What was implemented 1. **Alembic migration** (`m4_001_concurrency_locks`) — Creates the `locks` table with columns: `id`, `owner_id`, `resource_type`, `resource_id`, `acquired_at`, `expires_at`, plus a unique constraint on `(resource_type, resource_id)` and indexes on `owner_id` and `expires_at`. 2. **LockModel** — SQLAlchemy model added to `models.py`. 3. **Exception classes** — `LockConflictError` and `LockExpiredError` added to `core/exceptions.py`. 4. **LockService** (`application/services/lock_service.py`, 455 lines) — Full implementation: - `acquire()` — Acquire lock with configurable TTL (default 300s for plans, 600s for projects). Re-entrant for same owner; raises `LockConflictError` for different owner. - `release()` — Release a specific lock by resource. - `renew()` — Extend lock TTL; raises `LockExpiredError` if lock has already expired. - `release_all_for_owner()` — Graceful shutdown: release all locks for an owner. - `cleanup_expired()` — Startup routine: purge all expired locks. - `count_stale_locks()` — Diagnostics: count locks past expiry. - `is_locked()` — Check if a resource is currently locked. 5. **Diagnostics** — `_check_stale_locks()` added to `cli/commands/system.py` for the `agents diagnostics` command. 6. **Documentation** — `docs/reference/concurrency.md` covering lock behavior, TTL defaults, renewal strategy. 7. **Tests**: - **Behave**: 25 scenarios in `features/concurrency.feature` (all passing) — covers acquisition, re-entrancy, conflict detection, renewal, expiry, cleanup, diagnostics, graceful shutdown, validation errors. - **Robot**: `robot/concurrency_locks.robot` integration smoke test (passing). - **ASV**: `benchmarks/concurrency_lock_bench.py` with 6 benchmark classes. 8. **Quality gates**: `nox -e lint`, `nox -e typecheck`, `nox -e format -- --check` all pass. ### What is NOT yet implemented - **Subtask 3**: Locks are not yet enforced in `PlanLifecycleService` transitions or `SubplanService` scheduling. The `LockService` exists standalone but is not wired into the DI container or called during plan state transitions. - **Subtask 4**: Lock renewal for long-running phases — the `renew()` method exists but is not yet invoked from phase execution code. - **Coverage verification**: The full `nox -s coverage_report` run could not complete because the entire unit test suite (287 feature files) hangs — this is a **pre-existing issue** also present on `origin/master`, not caused by this change. - **Full nox run**: Same hanging issue prevents `nox` from completing all default sessions. ### Issues encountered - **Pre-existing test suite hang**: Running all 287 feature files together via `nox -e unit_tests` causes the test runner to hang indefinitely. This reproduces on `origin/master` as well. Individual feature files and small subsets run fine. - **Behave step name collision**: Had to rename the step `"a validation error should be raised"` to `"a lock validation error should be raised"` to avoid `AmbiguousStep` errors with an existing step in `domain_models_steps.py`.
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2026-02-20

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cleveragents/cleveragents-core#327
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