Function fetchAppConfigProfile

apps/sim/lib/core/config/appconfig.ts:136–167

(
  ids: AppConfigProfileIdentifiers,
  parse: (json: unknown) => T
)

 * is empty/unseeded or the first fetch fails.
 */
export async function fetchAppConfigProfile<T>(
  ids: AppConfigProfileIdentifiers,
  parse: (json: unknown) => T
): Promise<T | null> {
  const key = cacheKey(ids)
  const entry = (cache.get(key) as CacheEntry<T> | undefined) ?? {
    value: null,
    loaded: false,
    nextToken: undefined,
    expiresAt: 0,
    inflight: null,
  }
  cache.set(key, entry)

  // Cold: never polled — await a single shared poll so concurrent callers don't
  // each hit AppConfig (and don't race the rotating session token).
  if (!entry.loaded) {
    entry.inflight ??= poll(ids, parse, entry).finally(() => {
      entry.inflight = null
    })
    return entry.inflight
  }

  // Warm but stale: serve cached value, refresh once in the background.
  if (Date.now() >= entry.expiresAt && !entry.inflight) {
    entry.inflight = poll(ids, parse, entry).finally(() => {
      entry.inflight = null
    })
  }

  return entry.value
}