apps/gateway/src/middleware/correlation-id.ts

Metadata

• Purpose: Gateway middleware for cross-cutting concerns.
• Domain: applications
• Language: ts
• Bytes: 578
• Lines: 16
• Content hash (short): 6577f91c
• Source (start): apps/gateway/src/middleware/correlation-id.ts:1
• Source (end): apps/gateway/src/middleware/correlation-id.ts:16

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import { randomUUID } from "node:crypto";
import type { FastifyPluginAsync } from "fastify";
import { ensureUuid } from "../utils/uuid.js";

const CORRELATION_HEADER = "x-correlation-id";

export const correlationIdPlugin: FastifyPluginAsync = async (app) => {
  app.addHook("onRequest", async (request, reply) => {
    const incoming = request.headers[CORRELATION_HEADER] as string | undefined;
    const correlationId = ensureUuid(incoming, randomUUID());

    request.headers[CORRELATION_HEADER] = correlationId;
    reply.header(CORRELATION_HEADER, correlationId);
  });
};