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Make vote-shop debits atomic before granting rewards - #1600

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Make vote-shop debits atomic before granting rewards#1600
BenCodez wants to merge 39 commits into
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security/atomic-vote-shop

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@BenCodez

@BenCodez BenCodez commented Sep 7, 2026

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Summary

  • serialize purchases for the same user
  • recheck purchase limits inside the atomic section
  • use the synchronous point debit before any reward, message, or event is emitted
  • reserve the per-item limit alongside the debit
  • add a concurrent regression test proving one balance cannot fund two purchases

Testing

  • /tmp/apache-maven-3.9.11/bin/mvn -q -Dmaven.repo.local=/tmp/m2-votingplugin -Dtest=VoteShopPurchaseServiceTest test
  • git diff --check

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📝 Code Review Completed 2026-09-10T00:34:53.131727Z 21ac3f9 New commits
🔒 Security Review Completed 2026-09-07T21:31:06.987114Z 4b12ebf PR opened
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BenCodez commented Sep 7, 2026

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Addressed all review findings: locking is keyed by stable player identity, the striped lock table survives service reloads, persistence remains asynchronous, and the race test uses separate wrappers with a deliberately non-atomic debit. Full mvn clean package passes. @codex review

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Comment on lines +454 to +458
} catch (SQLException refundFailure) {
logFailure(refundFailure);
}
logFailure(markerFailure);
completeOnBukkit(source, completion, false);

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P1 Badge Retain a marker when transfer compensation cannot reach MySQL

When the approval callback is rejected and MySQL is unavailable for both markCompensating and the fallback refundHookStarted, this path only logs the failures and reports false; the journal remains HOOK_STARTED, while automatic recovery selects only RESERVED and COMPENSATING, leaving the source permanently charged. Unlike the already-fixed double-scheduler rejection, the fresh evidence here is that an accepted compensation task can itself lose the durable fence, so record the local compensation marker before returning from this failure path.

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Comment on lines +230 to +233
claimSharedMysqlPurchaseAsync(debit).whenComplete((claim, failure) -> {
if (failure != null || requiresCompensation(claim)) {
if (state.compareAndSet(COMPLETION_RUNNING, COMPLETION_COMPENSATING)) {
compensateSharedMysqlPurchase(player, user, completion, debit);

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P2 Badge Reschedule compensation after async claim rejection

If runTaskAsynchronously rejects synchronously in claimSharedMysqlPurchaseAsync, it returns an already-failed future, so this whenComplete callback runs inline on the player's entity lane and directly executes markCompensating plus the JDBC refund. During scheduler shutdown or rejection this can therefore block a Bukkit/Folia tick on multiple connection attempts; route this branch through scheduleSharedMysqlCompensation rather than calling the database routine inline.

AGENTS.md reference: AGENTS.md:L168-L168

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Comment on lines +668 to +669
private static boolean isSafeColumn(String column) {
return column != null && column.matches("[A-Za-z][A-Za-z0-9_-]{0,127}");

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P2 Badge Validate shop identifiers before creating durable debits

VoteShopLoader accepts section keys verbatim, but this recovery allow-list rejects valid YAML identifiers containing spaces or other quoted punctuation. In shared-MySQL mode, a limited item such as Daily Reward can still be reserved and debited because the normal SQL path quotes its column, yet its periodic reset fails this check and compensation cannot refund the stored debit. Validate this identifier grammar while loading the item before it becomes purchasable, or encode the durable column consistently.

AGENTS.md reference: AGENTS.md:L169-L169

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