├── .gitignore
├── Job Queue System.excalidraw
├── LICENSE
├── docker-compose.yml
├── package-lock.json
├── package.json
├── src
    ├── index.ts
    └── job-queue
    │   ├── queue.ts
    │   ├── redis-adapter.ts
    │   ├── types.ts
    │   └── worker.ts
└── tsconfig.json


/.gitignore:
--------------------------------------------------------------------------------
1 | node_modules


--------------------------------------------------------------------------------
/Job Queue System.excalidraw:
--------------------------------------------------------------------------------
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3503 |       "id": "QSeuuWKRse1a1Ij28Amv8",
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3509 |       "angle": 0,
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3547 | }


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | MIT License
 2 | 
 3 | Copyright (c) 2025 WebDevSimplified
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


--------------------------------------------------------------------------------
/docker-compose.yml:
--------------------------------------------------------------------------------
 1 | services:
 2 |   redis:
 3 |     image: redis:latest
 4 |     container_name: redis-job-queue
 5 |     restart: always
 6 |     ports:
 7 |       - "6379:6379"
 8 |     volumes:
 9 |       - redis_data:/data
10 |     command: ["redis-server", "--notify-keyspace-events", "Ex"]
11 | 
12 | volumes:
13 |   redis_data:
14 |     driver: local
15 | 


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "job-queue",
 3 |   "version": "1.0.0",
 4 |   "main": "index.js",
 5 |   "scripts": {
 6 |     "dev": "nodemon --watch src --exec ts-node src/index.ts",
 7 |     "inspect": "redis-commander"
 8 |   },
 9 |   "keywords": [],
10 |   "author": "",
11 |   "license": "ISC",
12 |   "description": "",
13 |   "devDependencies": {
14 |     "@types/node": "^22.13.17",
15 |     "nodemon": "^3.1.9",
16 |     "redis-commander": "^0.8.0",
17 |     "ts-node": "^10.9.2",
18 |     "typescript": "^5.8.2"
19 |   },
20 |   "dependencies": {
21 |     "ioredis": "^5.6.0"
22 |   }
23 | }
24 | 


--------------------------------------------------------------------------------
/src/index.ts:
--------------------------------------------------------------------------------
 1 | import { RedisQueue } from "./job-queue/redis-adapter"
 2 | import { Worker } from "./job-queue/worker"
 3 | 
 4 | const queue = new RedisQueue<{ email: string; body: string }>(
 5 |   "redis://localhost:6379",
 6 |   "test-queue",
 7 |   {
 8 |     retryAttempts: 3,
 9 |     retryDelay: 1000,
10 |   }
11 | )
12 | 
13 | queue.addJob({
14 |   data: { email: "test@test.com", body: "Hi" },
15 |   name: "1",
16 |   options: {
17 |     priority: 1,
18 |   },
19 | })
20 | 
21 | queue.addJob({
22 |   data: { email: "test@test.com", body: "Bye" },
23 |   name: "2",
24 |   options: {
25 |     priority: 3,
26 |     delay: 1000,
27 |   },
28 | })
29 | 
30 | queue.addJob({
31 |   data: { email: "test2@test.com", body: "Hello World" },
32 |   name: "3",
33 |   options: {
34 |     priority: 2,
35 |   },
36 | })
37 | 
38 | queue.addJob({
39 |   data: { email: "test2@test.com", body: "Error" },
40 |   name: "4",
41 | })
42 | 
43 | setTimeout(() => {
44 |   queue.addJob({
45 |     data: { email: "test@test.com", body: "High Priority" },
46 |     name: "5",
47 |     options: {
48 |       priority: 5,
49 |     },
50 |   })
51 | }, 2000)
52 | 
53 | const worker = new Worker(
54 |   queue,
55 |   async job => {
56 |     console.log(`Start: W1 ${job.name}`)
57 |     await sendEmail(job.data.email, job.data.body)
58 |   },
59 |   { concurrency: 3 }
60 | )
61 | 
62 | worker.start()
63 | 
64 | function sendEmail(email: string, body: string) {
65 |   if (body === "Error") {
66 |     console.log(`Error sending email to ${email}`)
67 |     throw new Error("Simulated error")
68 |   }
69 |   return new Promise(resolve => setTimeout(resolve, 1000))
70 | }
71 | 


--------------------------------------------------------------------------------
/src/job-queue/queue.ts:
--------------------------------------------------------------------------------
 1 | import { Job, JobOptions } from "./types"
 2 | 
 3 | export type QueueOptions = {
 4 |   retryAttempts: number
 5 |   retryDelay: number
 6 | }
 7 | 
 8 | export type OptionalJobOptions = Partial<JobOptions> & {
 9 |   retry?: Partial<JobOptions["retry"]>
10 | }
11 | 
12 | export abstract class Queue<T> {
13 |   protected queueName: string
14 |   protected options: QueueOptions
15 | 
16 |   constructor(
17 |     queueName: string,
18 |     options: QueueOptions = { retryAttempts: 10, retryDelay: 1000 }
19 |   ) {
20 |     this.queueName = queueName
21 |     this.options = options
22 |   }
23 | 
24 |   async addJob(
25 |     job: Omit<Job<T>, "id" | "options"> & {
26 |       options?: OptionalJobOptions
27 |       id?: string
28 |     }
29 |   ) {
30 |     const id = job.id ?? crypto.randomUUID()
31 |     if (
32 |       (job.options?.retry?.totalAttempts ?? 0) >=
33 |       (job.options?.retry?.maxAttempts ?? 1)
34 |     ) {
35 |       return id
36 |     }
37 | 
38 |     await this.push({
39 |       ...job,
40 |       id,
41 |       options: {
42 |         delay: job.options?.delay ?? 0,
43 |         priority: job.options?.priority ?? 0,
44 |         retry: {
45 |           totalAttempts: job.options?.retry?.totalAttempts ?? 0,
46 |           maxAttempts:
47 |             job.options?.retry?.maxAttempts ?? this.options.retryAttempts,
48 |           delay: job.options?.retry?.delay ?? this.options.retryDelay,
49 |         },
50 |       },
51 |     })
52 | 
53 |     return id
54 |   }
55 | 
56 |   protected abstract push(
57 |     job: Job<T> & { options: { retry: Required<Job<T>["options"]["retry"]> } }
58 |   ): Promise<unknown>
59 |   abstract getOrWaitForJob(): Promise<
60 |     | (Job<T> & { options: { retry: Required<Job<T>["options"]["retry"]> } })
61 |     | null
62 |   >
63 |   abstract get length(): Promise<number>
64 | }
65 | 


--------------------------------------------------------------------------------
/src/job-queue/redis-adapter.ts:
--------------------------------------------------------------------------------
  1 | import IORedis from "ioredis"
  2 | import { Job } from "./types"
  3 | import { Queue, QueueOptions } from "./queue"
  4 | 
  5 | export class RedisQueue<T> extends Queue<T> {
  6 |   private redisBlocking: IORedis
  7 |   private redisNonBlocking: IORedis
  8 |   private redisSubscriber: IORedis
  9 | 
 10 |   constructor(redisUrl: string, queueName: string, options?: QueueOptions) {
 11 |     super(queueName, options)
 12 | 
 13 |     this.redisBlocking = new IORedis(redisUrl)
 14 |     this.redisNonBlocking = new IORedis(redisUrl)
 15 |     this.redisSubscriber = new IORedis(redisUrl)
 16 | 
 17 |     this.listenForExpiredJobs()
 18 |     this.checkForExpiredJobs()
 19 |   }
 20 | 
 21 |   get length() {
 22 |     return this.redisNonBlocking.zcard(this.activeJobsQueue)
 23 |   }
 24 | 
 25 |   async getOrWaitForJob() {
 26 |     const data = await this.redisBlocking.bzpopmin(this.activeJobsQueue, 0)
 27 |     return data?.[1] ? JSON.parse(data[1]) : null
 28 |   }
 29 | 
 30 |   protected async push(job: Job<T>) {
 31 |     if (job.options.delay > 0) {
 32 |       return await this.redisNonBlocking
 33 |         .multi()
 34 |         .set(this.expiringJobIdList(job.id), job.id)
 35 |         .pexpire(this.expiringJobIdList(job.id), job.options.delay)
 36 |         .zadd(this.delayedJobIdsQueue, Date.now() + job.options.delay, job.id)
 37 |         .hset(this.delayedJobsList, job.id, JSON.stringify(job))
 38 |         .exec()
 39 |     } else {
 40 |       return await this.addActiveJob(job)
 41 |     }
 42 |   }
 43 | 
 44 |   // Ready to execute jobs sorted by priority
 45 |   private get activeJobsQueue() {
 46 |     return `${this.queueName}:active`
 47 |   }
 48 | 
 49 |   // Full job data for delayed jobs
 50 |   private get delayedJobsList() {
 51 |     return `${this.queueName}:jobs`
 52 |   }
 53 | 
 54 |   // Delayed job ids sorted by execution date
 55 |   private get delayedJobIdsQueue() {
 56 |     return `${this.queueName}:delayed`
 57 |   }
 58 | 
 59 |   // Delayed job ids that will expire after the delay
 60 |   private expiringJobIdList(jobId: string) {
 61 |     return `${this.queueName}:expiringJobs:${jobId}`
 62 |   }
 63 | 
 64 |   private async addActiveJob(job: Job<T>) {
 65 |     return await this.redisNonBlocking.zadd(
 66 |       this.activeJobsQueue,
 67 |       (job.options.priority ?? 0) * -1,
 68 |       JSON.stringify(job)
 69 |     )
 70 |   }
 71 | 
 72 |   private async moveJobToActive(jobId: string) {
 73 |     const job = await this.redisNonBlocking.hget(this.delayedJobsList, jobId)
 74 |     if (job == null) return
 75 | 
 76 |     await this.addActiveJob(JSON.parse(job))
 77 |     await this.redisNonBlocking
 78 |       .multi()
 79 |       .zrem(this.delayedJobIdsQueue, jobId)
 80 |       .hdel(this.delayedJobsList, jobId)
 81 |       .exec()
 82 |   }
 83 | 
 84 |   private async listenForExpiredJobs() {
 85 |     await this.redisSubscriber.subscribe("__keyevent@0__:expired")
 86 | 
 87 |     this.redisSubscriber.on("message", async (channel, message) => {
 88 |       if (channel !== "__keyevent@0__:expired") return
 89 |       if (!message.startsWith(this.expiringJobIdList(""))) return
 90 | 
 91 |       const jobId = message.split(":").pop()
 92 |       if (jobId == null) return
 93 | 
 94 |       await this.moveJobToActive(jobId)
 95 |     })
 96 |   }
 97 | 
 98 |   private async checkForExpiredJobs() {
 99 |     const expiredJobs = await this.redisNonBlocking.zrangebyscore(
100 |       this.delayedJobIdsQueue,
101 |       0,
102 |       Date.now()
103 |     )
104 | 
105 |     for (const jobId of expiredJobs) {
106 |       await this.moveJobToActive(jobId)
107 |     }
108 |   }
109 | }
110 | 


--------------------------------------------------------------------------------
/src/job-queue/types.ts:
--------------------------------------------------------------------------------
 1 | export type JobOptions = {
 2 |   delay: number
 3 |   priority: number
 4 |   retry: {
 5 |     totalAttempts: number
 6 |     maxAttempts: number
 7 |     delay: number
 8 |   }
 9 | }
10 | 
11 | export type Job<T> = {
12 |   id: string
13 |   name: string
14 |   data: T
15 |   options: JobOptions
16 | }
17 | 


--------------------------------------------------------------------------------
/src/job-queue/worker.ts:
--------------------------------------------------------------------------------
 1 | import { Queue } from "./queue"
 2 | import { Job } from "./types"
 3 | 
 4 | export class Worker<T> {
 5 |   private queue: Queue<T>
 6 |   private processJob: (job: Job<T>) => Promise<void>
 7 |   private concurrency
 8 |   private activeJobs: Map<string, Promise<void>> = new Map()
 9 | 
10 |   constructor(
11 |     queue: Queue<T>,
12 |     processJob: (job: Job<T>) => Promise<void>,
13 |     { concurrency = 1 } = {}
14 |   ) {
15 |     this.processJob = processJob
16 |     this.queue = queue
17 |     this.concurrency = concurrency
18 |   }
19 | 
20 |   async start() {
21 |     while (true) {
22 |       const job = await this.queue.getOrWaitForJob()
23 |       if (job == null) {
24 |         await new Promise(resolve => setTimeout(resolve, 15000))
25 |       } else {
26 |         this.activeJobs.set(
27 |           job.id,
28 |           this.processJob(job)
29 |             .catch(async () => {
30 |               await this.queue.addJob({
31 |                 ...job,
32 |                 options: {
33 |                   ...job.options,
34 |                   retry: {
35 |                     ...job.options.retry,
36 |                     totalAttempts: job.options.retry.totalAttempts + 1,
37 |                   },
38 |                   delay:
39 |                     job.options.retry.delay *
40 |                     (job.options.retry.totalAttempts + 1) ** 2,
41 |                 },
42 |               })
43 |             })
44 |             .finally(() => {
45 |               this.activeJobs.delete(job.id)
46 |             })
47 |         )
48 |       }
49 |       if (this.activeJobs.size >= this.concurrency) {
50 |         await Promise.any(this.activeJobs.values())
51 |       }
52 |     }
53 |   }
54 | }
55 | 


--------------------------------------------------------------------------------
/tsconfig.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "$schema": "https://json.schemastore.org/tsconfig",
 3 |   "display": "Node 22",
 4 |   "_version": "22.0.0",
 5 | 
 6 |   "compilerOptions": {
 7 |     "lib": ["es2023"],
 8 |     "module": "nodenext",
 9 |     "target": "es2022",
10 | 
11 |     "strict": true,
12 |     "esModuleInterop": true,
13 |     "skipLibCheck": true,
14 |     "moduleResolution": "node16"
15 |   }
16 | }
17 | 


--------------------------------------------------------------------------------