Function onResponse

src/utils/cacheStatsState.ts:54–79

(usage: CacheUsage)

 * Returns the updated in-memory state.
 */
export function onResponse(usage: CacheUsage): MemState {
  const sig = tokenSignature(usage)
  const hitRate = computeHitRate(usage)

  if (sig !== memState.signature) {
    // New API response — reset the TTL clock
    memState = {
      signature: sig,
      lastResetAt: Date.now(),
      lastHitRate: hitRate,
    }
    // Persist asynchronously; intentionally fire-and-forget
    if (sessionId !== null) {
      const filePath = getStateFilePath(sessionId)
      const toWrite: CacheStatsState = {
        version: 1,
        signature: sig,
        lastResetAt: memState.lastResetAt,
        lastHitRate: hitRate,
      }
      void writeStateAtomic(filePath, toWrite)
    }
  }

  return { ...memState }
}

/** Read current in-memory state without triggering a response update. */
export function getCacheStatsState(): MemState {