maro
45261a0461
- Next.js 16 App Router site with the ANOUMA design system - Payload CMS (PostgreSQL) for offers, events, posts and page content - WebRTC video-call system with custom signaling server - SMTP email reminders and booking-request notifications - Customer accounts, calendar-based availability, and booking workflow
26 lines
1.2 KiB
TypeScript
26 lines
1.2 KiB
TypeScript
import { sql } from "drizzle-orm";
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import type { PayloadRequest } from "payload";
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/**
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* Acquires a Postgres transaction-scoped advisory lock so that two
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* concurrent requests confirming a booking for the same day can't both pass
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* the "is this slot free?" check before either has committed (Payload's
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* default transaction isolation is READ COMMITTED, which alone would allow
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* that race). The lock is automatically released when the transaction ends.
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*
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* Must be called from inside a Payload hook/operation that already has an
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* active `req.transactionID` (true for collection create/update by default).
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*/
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export async function acquireBookingDayLock(req: PayloadRequest, dateKey: string): Promise<void> {
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const txID = req.transactionID ? String(await req.transactionID) : undefined;
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if (!txID) return; // No active transaction — nothing to lock against.
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const adapter = req.payload.db as unknown as {
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sessions?: Record<string, { db: { execute: (query: unknown) => Promise<unknown> } }>;
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drizzle: { execute: (query: unknown) => Promise<unknown> };
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};
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const tx = adapter.sessions?.[txID]?.db ?? adapter.drizzle;
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await tx.execute(sql`SELECT pg_advisory_xact_lock(hashtext(${dateKey}))`);
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}
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