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express-rate-limit 8.6.2: MemoryStore

검증된 샘플 — npm express-rate-limit 8.6.2: MemoryStore. node 22 · linux debian/x64 · docker에서 contract를 실행해 통과했습니다: MemoryStore initializes with windowMs and…

sha256:cb8664f79e1586e70c327da550f7c59e76f93741e08795b3cc6de107f34a3607

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실행 증거

선언된 환경과 서명된 실행을 분리해 두었습니다. 이 샘플이 무엇을 어디서 실행했는지 그대로 볼 수 있습니다.

증거 기준
서명된 컨트랙트 통과
검증 영수증
1
빌드한 서명 키
1
선언된 환경 linux 24 · ubuntu · glibc 2.39 x64 npm

검증 실행 환경

환경 컨트랙트 단계 실행일
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-07

케이스

HOW
목표
verify express-rate-limit.MemoryStore in pkg:npm/express-rate-limit@8.6.2
패키지
심벌
  • express-rate-limit.MemoryStore
생성일
2026-09-07T03:33:29Z

컨트랙트

  1. MemoryStore initializes with windowMs and sets localKeys flag to true
  2. MemoryStore increment records hits and returns totalHits count and resetTime Date
  3. MemoryStore get retrieves hit count and resetTime for active keys and returns undefined for unknown keys
  4. MemoryStore decrement reduces totalHits without dropping below zero
  5. MemoryStore resetKey clears hit records for a specific key
  6. MemoryStore resetAll clears hit records for all keys
  7. MemoryStore resets totalHits when incremented after windowMs expiration
  8. MemoryStore shutdown stops internal timers and resets all stored keys
  9. MemoryStore integrates seamlessly as the store option for rateLimit middleware

파일

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • test/contract.mjs

소스 아티팩트 내려받기 (tar.gz)

소스

PROMPT.md
Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify express-rate-limit.MemoryStore in pkg:npm/express-rate-limit@8.6.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/express-rate-limit@8.6.2
Demonstrate these symbols/APIs:
  - express-rate-limit.MemoryStore

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.
csx.json
{"case":{"caseId":"case:sha256:d9db0f23028670cd91c1a65ad80a253528561257ddbbb46e9bf0fed7ee637c34","contract":["MemoryStore initializes with windowMs and sets localKeys flag to true","MemoryStore increment records hits and returns totalHits count and resetTime Date","MemoryStore get retrieves hit count and resetTime for active keys and returns undefined for unknown keys","MemoryStore decrement reduces totalHits without dropping below zero","MemoryStore resetKey clears hit records for a specific key","MemoryStore resetAll clears hit records for all keys","MemoryStore resets totalHits when incremented after windowMs expiration","MemoryStore shutdown stops internal timers and resets all stored keys","MemoryStore integrates seamlessly as the store option for rateLimit middleware"],"goal":"verify express-rate-limit.MemoryStore in pkg:npm/express-rate-limit@8.6.2","kind":"HOW","packages":["pkg:npm/express-rate-limit@8.6.2"],"schemaVersion":1,"symbols":["express-rate-limit.MemoryStore"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/express-rate-limit@8.6.2"],"schemaVersion":1,"subject":"pkg:npm/express-rate-limit@8.6.2","symbols":["express-rate-limit.MemoryStore"],"verifierAdapter":"node-typescript@1"}
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package.json
{
  "name": "sample-express-rate-limit-memorystore",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "express-rate-limit": "8.6.2"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify express-rate-limit.MemoryStore in pkg:npm/express-rate-limit@8.6.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/express-rate-limit@8.6.2"
  ],
  "symbols": [
    "express-rate-limit.MemoryStore"
  ]
}
src/index.mjs
import { MemoryStore, rateLimit } from 'express-rate-limit';

/**
 * Creates and initializes an express-rate-limit MemoryStore instance.
 * @param {number} [windowMs=60000] - Time window in milliseconds.
 * @returns {MemoryStore} Initialized MemoryStore instance.
 */
export function createMemoryStore(windowMs = 60000) {
  const store = new MemoryStore();
  store.init({ windowMs });
  return store;
}

/**
 * Increments the hit count for a specific key in the store.
 * @param {MemoryStore} store
 * @param {string} key
 * @returns {Promise<{ totalHits: number, resetTime: Date }>}
 */
export async function recordHit(store, key) {
  return await store.increment(key);
}

/**
 * Retrieves the rate limit info for a key.
 * @param {MemoryStore} store
 * @param {string} key
 * @returns {Promise<{ totalHits: number, resetTime: Date } | undefined>}
 */
export async function getHitInfo(store, key) {
  return await store.get(key);
}

/**
 * Decrements the hit count for a key.
 * @param {MemoryStore} store
 * @param {string} key
 * @returns {Promise<void>}
 */
export async function decrementHit(store, key) {
  await store.decrement(key);
}

/**
 * Resets a single key in the store.
 * @param {MemoryStore} store
 * @param {string} key
 * @returns {Promise<void>}
 */
export async function resetKey(store, key) {
  await store.resetKey(key);
}

/**
 * Resets all keys in the store.
 * @param {MemoryStore} store
 * @returns {Promise<void>}
 */
export async function resetAllKeys(store) {
  await store.resetAll();
}

/**
 * Creates an express-rate-limit middleware configured with an explicit MemoryStore.
 * @param {Object} options
 * @param {number} [options.windowMs=60000]
 * @param {number} [options.limit=5]
 * @param {MemoryStore} [options.store]
 * @returns {Function} Express middleware function.
 */
export function createLimiterWithMemoryStore(options = {}) {
  const windowMs = options.windowMs || 60000;
  const store = options.store || createMemoryStore(windowMs);
  return rateLimit({
    windowMs,
    limit: options.limit || 5,
    store,
    validate: false,
    ...options,
  });
}

export { MemoryStore, rateLimit };
export default MemoryStore;
test/contract.mjs
import assert from 'node:assert/strict';
import {
  MemoryStore,
  createMemoryStore,
  recordHit,
  getHitInfo,
  decrementHit,
  resetKey,
  resetAllKeys,
  createLimiterWithMemoryStore,
  rateLimit
} from '../src/index.mjs';

function createMockReq(options = {}) {
  return {
    ip: options.ip || '127.0.0.1',
    path: options.path || '/',
    headers: options.headers || {},
    get(name) {
      return this.headers[name.toLowerCase()] || '';
    },
    ...options
  };
}

function createMockRes() {
  return {
    statusCode: 200,
    headers: {},
    body: undefined,
    ended: false,
    setHeader(name, value) {
      this.headers[name.toLowerCase()] = String(value);
      return this;
    },
    getHeader(name) {
      return this.headers[name.toLowerCase()];
    },
    status(code) {
      this.statusCode = code;
      return this;
    },
    send(body) {
      this.body = body;
      this.ended = true;
      return this;
    }
  };
}

function runMiddleware(middleware, req, res) {
  return new Promise((resolve) => {
    let nextCalled = false;
    const next = (err) => {
      nextCalled = true;
      resolve({ nextCalled, err });
    };
    Promise.resolve(middleware(req, res, next)).then(() => {
      if (!nextCalled && res.ended) {
        resolve({ nextCalled: false });
      }
    });
  });
}

// 1. MemoryStore initializes with windowMs and sets localKeys flag to true
{
  const store = createMemoryStore(60000);
  assert.equal(store.localKeys, true);
  assert.equal(store.windowMs, 60000);
  store.shutdown();
}

// 2. MemoryStore increment records hits and returns totalHits count and resetTime Date
{
  const store = createMemoryStore(60000);
  const result1 = await recordHit(store, 'user-1');
  assert.equal(result1.totalHits, 1);
  assert.ok(result1.resetTime instanceof Date);

  const initialResetTime = result1.resetTime.getTime();
  const result2 = await recordHit(store, 'user-1');
  assert.equal(result2.totalHits, 2);
  assert.equal(result2.resetTime.getTime(), initialResetTime);
  store.shutdown();
}

// 3. MemoryStore get retrieves hit count and resetTime for active keys and returns undefined for unknown keys
{
  const store = createMemoryStore(60000);
  await recordHit(store, 'user-2');
  const info = await getHitInfo(store, 'user-2');
  assert.ok(info !== undefined);
  assert.equal(info.totalHits, 1);
  assert.ok(info.resetTime instanceof Date);

  const unknownInfo = await getHitInfo(store, 'unknown-user');
  assert.equal(unknownInfo, undefined);
  store.shutdown();
}

// 4. MemoryStore decrement reduces totalHits without dropping below zero
{
  const store = createMemoryStore(60000);
  await recordHit(store, 'user-3');
  await recordHit(store, 'user-3');
  assert.equal((await getHitInfo(store, 'user-3')).totalHits, 2);

  await decrementHit(store, 'user-3');
  assert.equal((await getHitInfo(store, 'user-3')).totalHits, 1);

  await decrementHit(store, 'user-3');
  assert.equal((await getHitInfo(store, 'user-3')).totalHits, 0);

  // Decrementing when totalHits is 0 should not go negative
  await decrementHit(store, 'user-3');
  assert.equal((await getHitInfo(store, 'user-3')).totalHits, 0);
  store.shutdown();
}

// 5. MemoryStore resetKey clears hit records for a specific key
{
  const store = createMemoryStore(60000);
  await recordHit(store, 'key-a');
  await recordHit(store, 'key-b');

  await resetKey(store, 'key-a');
  assert.equal(await getHitInfo(store, 'key-a'), undefined);
  assert.equal((await getHitInfo(store, 'key-b')).totalHits, 1);
  store.shutdown();
}

// 6. MemoryStore resetAll clears hit records for all keys
{
  const store = createMemoryStore(60000);
  await recordHit(store, 'key-1');
  await recordHit(store, 'key-2');

  await resetAllKeys(store);
  assert.equal(await getHitInfo(store, 'key-1'), undefined);
  assert.equal(await getHitInfo(store, 'key-2'), undefined);
  store.shutdown();
}

// 7. MemoryStore resets totalHits when incremented after windowMs expiration
{
  const store = createMemoryStore(50);
  const first = await recordHit(store, 'short-lived');
  assert.equal(first.totalHits, 1);
  const firstResetTime = first.resetTime.getTime();

  await new Promise((r) => setTimeout(r, 70));

  const afterExpiry = await recordHit(store, 'short-lived');
  assert.equal(afterExpiry.totalHits, 1);
  assert.ok(afterExpiry.resetTime.getTime() > firstResetTime);
  store.shutdown();
}

// 8. MemoryStore shutdown stops internal timers and resets all stored keys
{
  const store = createMemoryStore(60000);
  await recordHit(store, 'shutdown-key');
  assert.equal((await getHitInfo(store, 'shutdown-key')).totalHits, 1);

  store.shutdown();
  assert.equal(await getHitInfo(store, 'shutdown-key'), undefined);
}

// 9. MemoryStore integrates seamlessly as the store option for rateLimit middleware
{
  const store = createMemoryStore(60000);
  const limiter = createLimiterWithMemoryStore({
    limit: 2,
    windowMs: 60000,
    store
  });

  const req1 = createMockReq({ ip: '10.10.10.1' });
  const res1 = createMockRes();
  const res1Status = await runMiddleware(limiter, req1, res1);
  assert.equal(res1Status.nextCalled, true);
  assert.equal(res1.statusCode, 200);

  const req2 = createMockReq({ ip: '10.10.10.1' });
  const res2 = createMockRes();
  const res2Status = await runMiddleware(limiter, req2, res2);
  assert.equal(res2Status.nextCalled, true);

  const req3 = createMockReq({ ip: '10.10.10.1' });
  const res3 = createMockRes();
  const res3Status = await runMiddleware(limiter, req3, res3);
  assert.equal(res3Status.nextCalled, false);
  assert.equal(res3.statusCode, 429);

  store.shutdown();
}

console.log('Contract assertions passed.');

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