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fix: take the level-check unique lock after the transaction - #1252
rahul05ranjan wants to merge 2 commits into
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Co-authored-by: rahul05ranjan <11793455+rahul05ranjan@users.noreply.github.com>
Co-authored-by: rahul05ranjan <11793455+rahul05ranjan@users.noreply.github.com>
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No actionable comments were generated in the recent review.
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| Layer / File(s) | Summary |
|---|---|
After-commit dispatch and regression test app/Actions/CreateCommit.php, tests/Feature/Controllers/CommitControllerTest.php |
CreateCommit registers the CheckUserLevel dispatch with DB::afterCommit. The test holds the user-specific unique-job lock and verifies that the commit request redirects and creates a commit. |
Priority:
Estimated code review effort: 2 (Simple) | ~10 minutes
Change: Bug fix · Severity of issue fixed: Medium
Possibly related PRs
- dev-null-sh/dev-null.sh#1136: This PR calls CreateCommit inside a scheduled-submission transaction, which uses the same commit path changed here.
Suggested reviewers: hbenabdallah, xheaven
Merge Risk: 
9579b
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Creating a commit no longer fails or rolls back when a level-check job lock is already held, because the job is now dispatched only after the transaction commits. The only noted tradeoff is that if the process dies between commit and callback, the level check waits for a later XP-earning action. The regression test was not run locally, so confirm hosted CI passes before merging.
Security architecture risk: 
9579b
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This is a narrowly scoped transaction-lifecycle correction. The authenticated user, approval rules and per-user job identity remain unchanged. Recovery after a post-commit dispatch failure remains unverified.
Retained concerns
No architecture-level concerns identified.Security review details
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Security Blast Radius
- inferred — The changed scheduling decision remains scoped to the creating user's level-check identity and notification. The changed call does not introduce a caller-selected job owner or expand cross-user authority.
Trust Boundaries and Controls
- observed — The web commit-creation route remains inside the auth middleware group and retains posting-timeout, commit-rules and commit-throttling middleware. The controller supplies the current authenticated User to the action; the PR does not modify these boundary declarations.
Resilience and Maintainability Implications
- inferred — Moving dispatch after commit prevents this callback from acquiring a unique lock on a rolled-back create and separates lock contention from commit persistence. Conversely, interruption or dispatch failure after commit cannot undo the saved content and may omit its notification check. Queue execution was already post-commit in the base; the evidence does not establish this as a newly introduced security regression or prove durable recovery.
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Pre-merge checks: 
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: moving acquisition of the level-check unique lock until after the transaction. Linked Issues check Issue #1066requires the second approved commit to avoid the PostgreSQL unique-lock failure and transaction rollback.CreateCommitnow registersdispatch(new CheckUserLevel($user))with `DB::after…Out of Scope Changes check The changed production code and the new test directly address Issue #1066. The comments document the PostgreSQL failure mechanism. No unrelated production behavior or unrelated test scope appears in t…Docstring Coverage Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat… Full details: Linked Issues check
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Explanation
Issue
#1066requires the second approved commit to avoid the PostgreSQL unique-lock failure and transaction rollback.CreateCommitnow registersdispatch(new CheckUserLevel($user))withDB::afterCommit, so lock acquisition runs after the commit. The new regression test holds the database cache lock and verifies a redirect plus persisted commit creation. The change keepsCheckUserLevelunique-job behavior.
Full details: Out of Scope Changes check
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Explanation
The changed production code and the new test directly address Issue
#1066. The comments document the PostgreSQL failure mechanism. No unrelated production behavior or unrelated test scope appears in the reviewed diff.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 1 functions across 2 files.
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Thanks for picking this up! I tested this locally (macOS, PHP 8.5, Postgres 18), merged onto the current 1. The new test passes without the fix. I put 2. The moderation path has the same bug. There's also an earlier PR for the same issue, #1075, which covers both paths. Its tests fail without the fix and pass with it, though it needs a small update for the To reproduce point 1: gh pr checkout 1252
git fetch https://github.com/dev-null-sh/dev-null.sh production
git checkout FETCH_HEAD -- app/Actions/CreateCommit.php
vendor/bin/pest tests/Feature/Controllers/CommitControllerTest.php --filter="unique level-check" |
Summary
Fixes #1066.
CreateCommitruns in aDB::transactionand dispatchesCheckUserLevelwith->afterCommit().CheckUserLevelisShouldBeUnique, and the unique-job lock is acquired at dispatch time, inside the transaction, on the database cache store. When the lock is already held (previous check for the same user still queued or running),DatabaseLock::acquirefails the INSERT and falls back to an UPDATE — but on Postgres the failed INSERT has aborted the enclosing transaction, so the UPDATE dies with 25P02 and the whole create rolls back. The user's second approved commit inside the lock window returns 500 and is lost, exactly as reported.The star path already solved this:
CreateCommitStartakes the same job's unique lock inDB::afterCommit, outside the transaction (app/Actions/CreateCommitStar.php:45), andCommitStarControllerTesthas a regression test for posting a star while the lock is held.Changes
app/Actions/CreateCommit.php:dispatch(new CheckUserLevel($user))->afterCommit()becomesDB::afterCommit(fn () => dispatch(new CheckUserLevel($user))). The lock INSERT (and the duplicate-INSERT fallback UPDATE) now run after the commit, on their own statements, so a held lock can no longer abort the create.DB::afterCommitexecutes immediately when no transaction is active, so the behavior outside a transaction is unchanged.The job keeps its
ShouldBeUniquesemantics: when the lock is held,acquire()returns false after the fallback UPDATE and the second check is dropped as before — the level is looked at once the burst settles, which is the job's documented purpose.Validation
production:CreateCommitis the only remaining dispatch site ofCheckUserLevelinside a transaction (the star path moved inCreateCommitStar.php:45;UpdateCommitStatuses— the otherafterCommit + CheckUserLevelsite — was checked too); of the other jobs dispatched in this transaction onlyReplyAsTomisShouldBeUnique, and itsuniqueIdis the commit id, which is new per create, so it cannot collide and never triggers the duplicate-INSERT path.DB::afterCommitwrap → commit persists, the lock INSERT fails at statement level, the fallback UPDATE succeeds,acquire()returns false and the job is dropped as a duplicate. Output in the notes below; no PHP runtime was available on this machine.creates a commit while a unique level-check job already holds a database cache lockintests/Feature/Controllers/CommitControllerTest.php, mirroring the existing star test line for line (admin poster so the commit is approved and the check is dispatched,cache.defaultset todatabase,Cache::lock(...)->get()to hold the unique key,DatabaseTransactionsManagerswap so after-commit callbacks stay pending until the test's outer transaction). It fails on HEAD with the 500 and passes with the wrap. Not run locally — PHP is not available on this machine; hosted CI (tests.yml) is the run.Independent review
Agent-created PR. No independent reviewer was available for this revision; recorded verification is my own static trace and the Postgres-semantics mirror above. Hosted CI plus a maintainer review are requested before merge.
Limitations
CreateCommitStaralready accepts.DB::afterCommitdefers to the outermost transaction, so a future caller that opens a transaction aroundCreateCommitgets the same deferred behavior — noted here so the semantics are explicit.Summary by CodeRabbit