INNER CODE UNIT · TypeScript

cachedOrCompute

harvard-edge/cs249r_book · interviews/staffml-vault-worker/src/index.ts:199

async function cachedOrCompute(
  req: Request,
  env: Env,
  ctx: ExecutionContext,
  ttlSec: number,
  compute: () => Promise<Response>,
  opts: { useCache: boolean } = { useCache: true },
): Promise<Response> {
  // Graceful degradation when the CF Cache API isn't available (Node test
  // env, vault-api local shim, or a runtime regression) — always compute
  // and skip caching. Prevents crashing the handler on missing globals.
  if (!opts.useCache || typeof caches === "undefined" || !caches?.default) {
    return compute();
  }
  const manifest = await getManifest(env);
  const key = cacheKey(req, manifest.release_id);
  const cached = await caches.default.match(key);
  if (cached) {

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