Initial curated projectbrain source from 8a7b1e0651dbdab97d744cbd2e653ab3970ac6c5

backend/src/plugins/requestId.ts

@@ -0,0 +1,32 @@
+import type { FastifyInstance, FastifyRequest } from "fastify";
+import { randomUUID } from "node:crypto";
+
+declare module "fastify" {
+  interface FastifyRequest {
+    requestId: string;
+  }
+}
+
+const firstHeaderValue = (
+  value: string | string[] | undefined,
+): string | undefined => (Array.isArray(value) ? value[0] : value);
+
+export const createRequestId = (
+  incomingRequestId: string | string[] | undefined,
+): string => {
+  const requestId = firstHeaderValue(incomingRequestId);
+
+  return requestId && /^[A-Za-z0-9_-]{1,128}$/.test(requestId)
+    ? requestId
+    : `req-${randomUUID()}`;
+};
+
+export const requestIdPlugin = async (app: FastifyInstance) => {
+  app.addHook("onRequest", async (request, reply) => {
+    request.requestId = request.id;
+    reply.header("x-request-id", request.requestId);
+  });
+};
+
+export const getRequestId = (request: FastifyRequest): string =>
+  request.requestId ?? request.id ?? `req-${randomUUID()}`;