├── .gitignore ├── .travis.yml ├── History.md ├── Makefile ├── Readme.md ├── index.js ├── microtime.js ├── package-lock.json ├── package.json └── test └── index.js /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules 2 | dump.rdb 3 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: node_js 2 | node_js: 3 | - "8" 4 | - "10" 5 | - "12" 6 | services: 7 | - redis-server 8 | install: 9 | - npm install 10 | script: 11 | - make test 12 | 13 | -------------------------------------------------------------------------------- /History.md: -------------------------------------------------------------------------------- 1 | # ratelimiter Change Log. 2 | 3 | ## 1.0.3 / 2014-06-06 4 | ================== 5 | 6 | * Fixes #6: In concurrent environment, the race condition occurs. 7 | 8 | ## v1.0.2 / 2014-06-06 9 | 10 | * fix race condition when expiration happens between get and decr 11 | 12 | ## v1.0.1 / 2014-03-14 13 | 14 | * fix race condition resetting the keys. 15 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | 2 | test: 3 | @./node_modules/.bin/mocha \ 4 | --require should \ 5 | --reporter dot \ 6 | --timeout 10s \ 7 | --bail \ 8 | --exit 9 | 10 | .PHONY: test 11 | -------------------------------------------------------------------------------- /Readme.md: -------------------------------------------------------------------------------- 1 | # ratelimiter 2 | 3 | Rate limiter for Node.js backed by Redis. 4 | 5 | > **NOTE**: Promise version available at [async-ratelimiter](https://github.com/microlinkhq/async-ratelimiter). 6 | 7 | [![Build Status](https://travis-ci.org/tj/node-ratelimiter.svg)](https://travis-ci.org/tj/node-ratelimiter) 8 | 9 | ## Release Notes 10 | [v3.4.1](https://github.com/tj/node-ratelimiter/tree/v3.4.1) - [#55](/../../issues/55) by [@barwin](https://github.com/barwin) - Remove splice operation. 11 | 12 | [v3.3.1](https://github.com/tj/node-ratelimiter/tree/v3.3.1) - [#51](/../../issues/51) - Remove tidy option as it's always true. 13 | 14 | [v3.3.0](https://github.com/tj/node-ratelimiter/tree/v3.3.0) - [#47](/../../pull/47) by [@penghap](https://github.com/penghap) - Add tidy option to clean old records upon saving new records. Drop support in node 4. 15 | 16 | [v3.2.0](https://github.com/tj/node-ratelimiter/tree/v3.2.0) - [#44](/../../pull/44) by [@xdmnl](https://github.com/xdmnl) - Return accurate reset time for each limited call. 17 | 18 | [v3.1.0](https://github.com/tj/node-ratelimiter/tree/v3.1.0) - [#40](/../../pull/40) by [@ronjouch](https://github.com/ronjouch) - Add reset milliseconds to the result object. 19 | 20 | [v3.0.2](https://github.com/tj/node-ratelimiter/tree/v3.0.0) - [#33](/../../pull/33) by [@promag](https://github.com/promag) - Use sorted set to limit with moving window. 21 | 22 | [v2.2.0](https://github.com/tj/node-ratelimiter/tree/v2.2.0) - [#30](/../../pull/30) by [@kp96](https://github.com/kp96) - Race condition when using `async.times`. 23 | 24 | [v2.1.3](https://github.com/tj/node-ratelimiter/tree/v2.1.3) - [#22](/../../pull/22) by [@coderhaoxin](https://github.com/coderhaoxin) - Dev dependencies versions bump. 25 | 26 | [v2.1.2](https://github.com/tj/node-ratelimiter/tree/v2.1.2) - [#17](/../../pull/17) by [@waleedsamy](https://github.com/waleedsamy) - Add Travis CI support. 27 | 28 | [v2.1.1](https://github.com/tj/node-ratelimiter/tree/v2.1.1) - [#13](/../../pull/13) by [@kwizzn](https://github.com/kwizzn) - Fixes out-of-sync TTLs after running decr(). 29 | 30 | [v2.1.0](https://github.com/tj/node-ratelimiter/tree/v2.1.0) - [#12](/../../pull/12) by [@luin](https://github.com/luin) - Adding support for ioredis. 31 | 32 | [v2.0.1](https://github.com/tj/node-ratelimiter/tree/v2.0.1) - [#9](/../../pull/9) by [@ruimarinho](https://github.com/ruimarinho) - Update redis commands to use array notation. 33 | 34 | [v2.0.0](https://github.com/tj/node-ratelimiter/tree/v2.0.0) - **API CHANGE** - Change `remaining` to include current call instead of decreasing it. Decreasing caused an off-by-one problem and caller could not distinguish between last legit call and a rejected call. 35 | 36 | ## Requirements 37 | 38 | - Redis 2.6.12+ 39 | - Node 8.0.0+ 40 | 41 | ## Installation 42 | 43 | ``` 44 | $ npm install ratelimiter 45 | ``` 46 | 47 | ## Example 48 | 49 | Example Connect middleware implementation limiting against a `user._id`: 50 | 51 | ```js 52 | var id = req.user._id; 53 | var limit = new Limiter({ id: id, db: db }); 54 | limit.get(function(err, limit){ 55 | if (err) return next(err); 56 | 57 | res.set('X-RateLimit-Limit', limit.total); 58 | res.set('X-RateLimit-Remaining', limit.remaining - 1); 59 | res.set('X-RateLimit-Reset', limit.reset); 60 | 61 | // all good 62 | debug('remaining %s/%s %s', limit.remaining - 1, limit.total, id); 63 | if (limit.remaining) return next(); 64 | 65 | // not good 66 | var delta = (limit.reset * 1000) - Date.now() | 0; 67 | var after = limit.reset - (Date.now() / 1000) | 0; 68 | res.set('Retry-After', after); 69 | res.send(429, 'Rate limit exceeded, retry in ' + ms(delta, { long: true })); 70 | }); 71 | ``` 72 | 73 | ## Result Object 74 | - `total` - `max` value 75 | - `remaining` - number of calls left in current `duration` without decreasing current `get` 76 | - `reset` - time since epoch in seconds at which the rate limiting period will end (or already ended) 77 | - `resetMs` - time since epoch in milliseconds at which the rate limiting period will end (or already ended) 78 | 79 | ## Options 80 | 81 | - `id` - the identifier to limit against (typically a user id) 82 | - `db` - redis connection instance 83 | - `max` - max requests within `duration` [2500] 84 | - `duration` - of limit in milliseconds [3600000] 85 | 86 | # License 87 | 88 | MIT 89 | -------------------------------------------------------------------------------- /index.js: -------------------------------------------------------------------------------- 1 | /** 2 | * Module dependencies. 3 | */ 4 | 5 | var assert = require('assert'); 6 | var microtime = require('./microtime'); 7 | 8 | /** 9 | * Expose `Limiter`. 10 | */ 11 | 12 | module.exports = Limiter; 13 | 14 | /** 15 | * Initialize a new limiter with `opts`: 16 | * 17 | * - `id` identifier being limited 18 | * - `db` redis connection instance 19 | * 20 | * @param {Object} opts 21 | * @api public 22 | */ 23 | 24 | function Limiter(opts) { 25 | this.id = opts.id; 26 | this.db = opts.db; 27 | assert(this.id, '.id required'); 28 | assert(this.db, '.db required'); 29 | this.max = opts.max || 2500; 30 | this.duration = opts.duration || 3600000; 31 | this.key = 'limit:' + this.id; 32 | } 33 | 34 | /** 35 | * Inspect implementation. 36 | * 37 | * @api public 38 | */ 39 | 40 | Limiter.prototype.inspect = function() { 41 | return ''; 45 | }; 46 | 47 | /** 48 | * Get values and header / status code and invoke `fn(err, info)`. 49 | * 50 | * redis is populated with the following keys 51 | * that expire after N milliseconds: 52 | * 53 | * - limit: 54 | * 55 | * @param {Function} fn 56 | * @api public 57 | */ 58 | 59 | Limiter.prototype.get = function (fn) { 60 | var db = this.db; 61 | var duration = this.duration; 62 | var key = this.key; 63 | var max = this.max; 64 | var now = microtime.now(); 65 | var start = now - duration * 1000; 66 | var operations = [ 67 | ['zremrangebyscore', key, 0, start], 68 | ['zcard', key], 69 | ['zadd', key, now, now], 70 | ['zrange', key, 0, 0], 71 | ['zrange', key, -max, -max], 72 | ['zremrangebyrank', key, 0, -(max + 1)], 73 | ['pexpire', key, duration], 74 | ] 75 | 76 | db.multi(operations) 77 | .exec(function (err, res) { 78 | if (err) return fn(err); 79 | 80 | var isIoRedis = Array.isArray(res[0]); 81 | var count = parseInt(isIoRedis ? res[1][1] : res[1]); 82 | var oldest = parseInt(isIoRedis ? res[3][1] : res[3]); 83 | var oldestInRange = parseInt(isIoRedis ? res[4][1] : res[4]); 84 | var resetMicro = (Number.isNaN(oldestInRange) ? oldest : oldestInRange) + duration * 1000; 85 | 86 | fn(null, { 87 | remaining: count < max ? max - count : 0, 88 | reset: Math.floor(resetMicro / 1000000), 89 | resetMs: Math.floor(resetMicro / 1000), 90 | total: max 91 | }); 92 | }); 93 | }; 94 | 95 | /** 96 | * Check whether the first item of multi replies is null, 97 | * works with ioredis and node_redis 98 | * 99 | * @param {Array} replies 100 | * @return {Boolean} 101 | * @api private 102 | */ 103 | 104 | function isFirstReplyNull(replies) { 105 | if (!replies) { 106 | return true; 107 | } 108 | 109 | return Array.isArray(replies[0]) ? 110 | // ioredis 111 | !replies[0][1] : 112 | // node_redis 113 | !replies[0]; 114 | } 115 | -------------------------------------------------------------------------------- /microtime.js: -------------------------------------------------------------------------------- 1 | 2 | var time = Date.now() * 1e3; 3 | var start = process.hrtime(); 4 | 5 | /** 6 | * Expose `now`. 7 | */ 8 | 9 | module.exports.now = function() { 10 | var diff = process.hrtime(start); 11 | 12 | return time + diff[0] * 1e6 + Math.round(diff[1] * 1e-3); 13 | } 14 | -------------------------------------------------------------------------------- /package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "ratelimiter", 3 | "version": "3.4.1", 4 | "lockfileVersion": 1, 5 | "requires": true, 6 | "dependencies": { 7 | "ansi-colors": { 8 | "version": "3.2.3", 9 | "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.2.3.tgz", 10 | "integrity": "sha512-LEHHyuhlPY3TmuUYMh2oz89lTShfvgbmzaBcxve9t/9Wuy7Dwf4yoAKcND7KFT1HAQfqZ12qtc+DUrBMeKF9nw==", 11 | "dev": true 12 | }, 13 | "ansi-regex": { 14 | "version": "3.0.0", 15 | "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz", 16 | "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=", 17 | "dev": true 18 | }, 19 | "ansi-styles": { 20 | "version": "3.2.1", 21 | "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz", 22 | 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"resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.5.0.tgz", 2168 | "integrity": "sha512-HK25qidFTCVuj/D1VfNiEndpLIeJN78aqgR23nL3y4N0U/91cOAzqfHlF8n2BvoNDcZmJKin3ddNSvOxSr8flw==", 2169 | "dev": true, 2170 | "requires": { 2171 | "flat": "^4.1.0", 2172 | "lodash": "^4.17.11", 2173 | "yargs": "^12.0.5" 2174 | } 2175 | } 2176 | } 2177 | } 2178 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "ratelimiter", 3 | "version": "3.4.1", 4 | "repository": "visionmedia/node-ratelimiter", 5 | "description": "abstract rate limiter backed by redis", 6 | "keywords": [ 7 | "rate", 8 | "ratelimit", 9 | "limiter", 10 | "limit" 11 | ], 12 | "scripts": { 13 | "test": "mocha --exit" 14 | }, 15 | "dependencies": {}, 16 | "devDependencies": { 17 | "async": "3.1.0", 18 | "ioredis": "4.14.1", 19 | "mocha": "*", 20 | "redis": "2.8.0", 21 | "should": "*" 22 | }, 23 | "license": "MIT", 24 | "contributors": [ 25 | "Francois-Guillaume Ribreau " 26 | ] 27 | } 28 | -------------------------------------------------------------------------------- /test/index.js: -------------------------------------------------------------------------------- 1 | require('should'); 2 | var Limiter = require('..'), 3 | async = require('async'); 4 | 5 | // Uncomment the following line if you want to see 6 | // debug logs from the node-redis module. 7 | //redis.debug_mode = true; 8 | 9 | ['redis', 'ioredis'].forEach(function(redisModuleName) { 10 | var redisModule = require(redisModuleName); 11 | var db = require(redisModuleName).createClient(); 12 | describe('Limiter with ' + redisModuleName, function() { 13 | beforeEach(function(done) { 14 | db.keys('limit:*', function(err, keys) { 15 | if (err) return done(err); 16 | if (!keys.length) return done(); 17 | var args = keys.concat(done); 18 | db.del.apply(db, args); 19 | }); 20 | }); 21 | 22 | describe('.total', function() { 23 | it('should represent the total limit per reset period', function(done) { 24 | var limit = new Limiter({ 25 | max: 5, 26 | id: 'something', 27 | db: db 28 | }); 29 | limit.get(function(err, res) { 30 | res.total.should.equal(5); 31 | done(); 32 | }); 33 | }); 34 | }); 35 | 36 | describe('.remaining', function() { 37 | it('should represent the number of requests remaining in the reset period', function(done) { 38 | var limit = new Limiter({ 39 | max: 5, 40 | duration: 100000, 41 | id: 'something', 42 | db: db 43 | }); 44 | limit.get(function(err, res) { 45 | res.remaining.should.equal(5); 46 | limit.get(function(err, res) { 47 | res.remaining.should.equal(4); 48 | limit.get(function(err, res) { 49 | res.remaining.should.equal(3); 50 | done(); 51 | }); 52 | }); 53 | }); 54 | }); 55 | }); 56 | 57 | describe('.reset', function() { 58 | it('should represent the next reset time in UTC epoch seconds', function(done) { 59 | var limit = new Limiter({ 60 | max: 5, 61 | duration: 60000, 62 | id: 'something', 63 | db: db 64 | }); 65 | limit.get(function(err, res) { 66 | var left = res.reset - (Date.now() / 1000); 67 | left.should.be.below(60).and.be.greaterThan(0); 68 | done(); 69 | }); 70 | }); 71 | }); 72 | 73 | describe('.resetMs', function() { 74 | it('should represent the next reset time in UTC epoch milliseconds', function(done) { 75 | var limit = new Limiter({ 76 | max: 5, 77 | duration: 60000, 78 | id: 'something', 79 | db: db 80 | }); 81 | limit.get(function(err, res) { 82 | var left = res.resetMs - Date.now(); 83 | Number.isInteger(left).should.be.true; 84 | left.should.be.within(0, 60000); 85 | done(); 86 | }); 87 | }); 88 | }); 89 | 90 | describe('when the limit is exceeded', function() { 91 | var limit; 92 | 93 | beforeEach(function (done) { 94 | limit = new Limiter({ 95 | max: 2, 96 | id: 'something', 97 | db: db 98 | }); 99 | 100 | limit.get(function() { 101 | limit.get(function() { 102 | done(); 103 | }); 104 | }); 105 | }); 106 | 107 | it('should retain .remaining at 0', function(done) { 108 | limit.get(function(err, res) { 109 | // function caller should reject this call 110 | res.remaining.should.equal(0); 111 | done(); 112 | }); 113 | }); 114 | 115 | it('should return an increasing reset time after each call', function (done) { 116 | setTimeout(function () { 117 | limit.get(function(err, res) { 118 | var originalResetMs = res.resetMs; 119 | 120 | setTimeout(function() { 121 | limit.get(function (err, res) { 122 | res.resetMs.should.be.greaterThan(originalResetMs); 123 | done(); 124 | }); 125 | }, 10); 126 | }); 127 | }, 10); 128 | }); 129 | }); 130 | 131 | describe('when the duration is exceeded', function() { 132 | it('should reset', function(done) { 133 | this.timeout(5000); 134 | var limit = new Limiter({ 135 | duration: 2000, 136 | max: 2, 137 | id: 'something', 138 | db: db 139 | }); 140 | limit.get(function(err, res) { 141 | res.remaining.should.equal(2); 142 | limit.get(function(err, res) { 143 | res.remaining.should.equal(1); 144 | setTimeout(function() { 145 | limit.get(function(err, res) { 146 | var left = res.reset - (Date.now() / 1000); 147 | left.should.be.below(2); 148 | res.remaining.should.equal(2); 149 | done(); 150 | }); 151 | }, 3000); 152 | }); 153 | }); 154 | }); 155 | }); 156 | 157 | describe('when multiple successive calls are made', function() { 158 | it('the next calls should not create again the limiter in Redis', function(done) { 159 | var limit = new Limiter({ 160 | duration: 10000, 161 | max: 2, 162 | id: 'something', 163 | db: db 164 | }); 165 | limit.get(function(err, res) { 166 | res.remaining.should.equal(2); 167 | }); 168 | 169 | limit.get(function(err, res) { 170 | res.remaining.should.equal(1); 171 | done(); 172 | }); 173 | }); 174 | 175 | it('updating the count should keep all TTLs in sync', function(done) { 176 | var limit = new Limiter({ 177 | duration: 10000, 178 | max: 2, 179 | id: 'something', 180 | db: db 181 | }); 182 | limit.get(function(err, res) {}); // All good here. 183 | limit.get(function(err, res) { 184 | db.multi() 185 | .pttl(['limit:something:count']) 186 | .pttl(['limit:something:limit']) 187 | .pttl(['limit:something:reset']) 188 | .exec(function(err, res) { 189 | if (err) return done(err); 190 | var ttlCount = (typeof res[0] === 'number') ? res[0] : res[0][1]; 191 | var ttlLimit = (typeof res[1] === 'number') ? res[1] : res[1][1]; 192 | var ttlReset = (typeof res[2] === 'number') ? res[2] : res[2][1]; 193 | ttlLimit.should.equal(ttlCount); 194 | ttlReset.should.equal(ttlCount); 195 | done(); 196 | }); 197 | }); 198 | }); 199 | }); 200 | 201 | describe('when trying to decrease before setting value', function() { 202 | it('should create with ttl when trying to decrease', function(done) { 203 | var limit = new Limiter({ 204 | duration: 10000, 205 | max: 2, 206 | id: 'something', 207 | db: db 208 | }); 209 | db.setex('limit:something:count', -1, 1, function() { 210 | limit.get(function(err, res) { 211 | res.remaining.should.equal(2); 212 | limit.get(function(err, res) { 213 | res.remaining.should.equal(1); 214 | limit.get(function(err, res) { 215 | res.remaining.should.equal(0); 216 | done(); 217 | }); 218 | }); 219 | }); 220 | }); 221 | }); 222 | }); 223 | 224 | describe('when multiple concurrent clients modify the limit', function() { 225 | var clientsCount = 7, 226 | max = 5, 227 | left = max, 228 | limits = []; 229 | 230 | for (var i = 0; i < clientsCount; ++i) { 231 | limits.push(new Limiter({ 232 | duration: 10000, 233 | max: max, 234 | id: 'something', 235 | db: redisModule.createClient() 236 | })); 237 | } 238 | 239 | it('should prevent race condition and properly set the expected value', function(done) { 240 | var responses = []; 241 | 242 | function complete() { 243 | responses.push(arguments); 244 | 245 | if (responses.length == clientsCount) { 246 | // If there were any errors, report. 247 | var err = responses.some(function(res) { 248 | return res[0]; 249 | }); 250 | 251 | if (err) { 252 | done(err); 253 | } else { 254 | responses.sort(function (r1, r2) { return r1[1].remaining < r2[1].remaining; }); 255 | responses.forEach(function(res) { 256 | res[1].remaining.should.equal(left < 0 ? 0 : left); 257 | left--; 258 | }); 259 | 260 | for (var i = max - 1; i < clientsCount; ++i) { 261 | responses[i][1].remaining.should.equal(0); 262 | } 263 | 264 | done(); 265 | } 266 | } 267 | } 268 | 269 | // Warm up and prepare the data. 270 | limits[0].get(function(err, res) { 271 | if (err) { 272 | done(err); 273 | } 274 | else { 275 | res.remaining.should.equal(left--); 276 | 277 | // Simulate multiple concurrent requests. 278 | limits.forEach(function(limit) { 279 | limit.get(complete); 280 | }); 281 | } 282 | }); 283 | }); 284 | }); 285 | 286 | describe('when limiter is called in parallel by multiple clients', function() { 287 | var max = 6, 288 | limiter; 289 | 290 | limiter = new Limiter({ 291 | duration: 10000, 292 | max: max, 293 | id: 'asyncsomething', 294 | db: redisModule.createClient() 295 | }); 296 | 297 | it('should set the count properly without race conditions', function(done) { 298 | async.times(max, function(n, next) { 299 | limiter.get(next); 300 | }, 301 | function(errs, limits) { 302 | 303 | limits.forEach(function(limit) { 304 | limit.remaining.should.equal(max--); 305 | }); 306 | done(); 307 | 308 | }); 309 | }); 310 | }); 311 | }); 312 | }); 313 | --------------------------------------------------------------------------------