root
29 lines
972 B
TypeScript
29 lines
972 B
TypeScript
import { Injectable } from "@nestjs/common";
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import { type Prisma } from "@prisma/client";
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/**
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* Transaction-scoped serialization protocol for policy subjects.
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*
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* Every transaction that reads or writes block, sanction, or account-status
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* policy MUST call this method first for every affected account. IDs are
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* de-duplicated and sorted so overlapping multi-account operations cannot
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* deadlock. The lock is released by PostgreSQL only when the transaction ends;
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* callers must therefore pass the transaction client, never PrismaService.
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*/
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@Injectable()
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export class SafetyLockService {
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async lockAccounts(
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tx: Prisma.TransactionClient,
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accountIds: readonly string[],
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): Promise<void> {
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const canonicalIds = Array.from(new Set(accountIds)).sort();
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for (const accountId of canonicalIds) {
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await tx.$executeRaw`
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SELECT pg_advisory_xact_lock(
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hashtextextended(${`safety:${accountId}`}, 0)
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)
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`;
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}
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}
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}
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