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2 <img src="./images/logo.png" width="340px" height="266px"/>
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6
7# Node.js Worker_Threads and Cluster Worker Pool
8
9</div>
10
11<div align="center">
12
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24</div>
25
26## Why Poolifier?
27
28Poolifier is used to perform CPU and/or I/O intensive tasks on Node.js servers, it implements worker pools using [worker_threads](https://nodejs.org/api/worker_threads.html) and [cluster](https://nodejs.org/api/cluster.html) Node.js modules.
29With poolifier you can improve your **performance** and resolve problems related to the event loop.
30Moreover you can execute your tasks using an API designed to improve the **developer experience**.
31Please consult our [general guidelines](#general-guidelines).
32
33- Easy to use :white_check_mark:
34- Fixed and dynamic pool size :white_check_mark:
35- Easy switch from a pool type to another :white_check_mark:
36- Performance [benchmarks](./benchmarks/README.md) :white_check_mark:
37- No runtime dependencies :white_check_mark:
38- Proper integration with Node.js [async_hooks](https://nodejs.org/api/async_hooks.html) :white_check_mark:
39- Support for CommonJS, ESM and TypeScript :white_check_mark:
40- Support for [worker_threads](https://nodejs.org/api/worker_threads.html) and [cluster](https://nodejs.org/api/cluster.html) Node.js modules :white_check_mark:
41- Support for multiple task functions :white_check_mark:
42- Support for task functions [CRUD](https://en.wikipedia.org/wiki/Create,_read,_update_and_delete) operations at runtime :white_check_mark:
43- Support for sync and async task functions :white_check_mark:
44- Tasks distribution strategies :white_check_mark:
45- Lockless tasks queueing :white_check_mark:
46- Queued tasks rescheduling:
47 - Task stealing on idle :white_check_mark:
48 - Tasks stealing under back pressure :white_check_mark:
49 - Tasks redistribution on worker error :white_check_mark:
50- General guidelines on pool choice :white_check_mark:
51- Error handling out of the box :white_check_mark:
52- Widely tested :white_check_mark:
53- Active community :white_check_mark:
54- Code quality [![Bugs](https://sonarcloud.io/api/project_badges/measure?project=poolifier_poolifier&metric=bugs)](https://sonarcloud.io/dashboard?id=poolifier_poolifier)
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60- Code security [![Security Rating](https://sonarcloud.io/api/project_badges/measure?project=poolifier_poolifier&metric=security_rating)](https://sonarcloud.io/dashboard?id=poolifier_poolifier) [![Vulnerabilities](https://sonarcloud.io/api/project_badges/measure?project=poolifier_poolifier&metric=vulnerabilities)](https://sonarcloud.io/dashboard?id=poolifier_poolifier)
61
62## Table of contents
63
64- [Overview](#overview)
65- [Installation](#installation)
66- [Usage](#usage)
67- [Node.js versions](#nodejs-versions)
68- [API](#api)
69- [General guidelines](#general-guidelines)
70- [Worker choice strategies](#worker-choice-strategies)
71- [Contribute](#contribute)
72- [Team](#team)
73- [License](#license)
74
75## Overview
76
77Poolifier contains two [worker_threads](https://nodejs.org/api/worker_threads.html#class-worker)/[cluster](https://nodejs.org/api/cluster.html#cluster_class_worker) worker pool implementations, you don't have to deal with [worker_threads](https://nodejs.org/api/worker_threads.html)/[cluster](https://nodejs.org/api/cluster.html) complexity.
78The first implementation is a fixed worker pool, with a defined number of workers that are started at creation time and will be reused.
79The second implementation is a dynamic worker pool, with a number of worker started at creation time (these workers will be always active and reused) and other workers created when the load will increase (with an upper limit, these workers will be reused when active), the newly created workers will be stopped after a configurable period of inactivity.
80You have to implement your worker by extending the _ThreadWorker_ or _ClusterWorker_ class.
81
82## Installation
83
84```shell
85npm install poolifier --save
86```
87
88## Usage
89
90You can implement a poolifier [worker_threads](https://nodejs.org/api/worker_threads.html#class-worker) worker in a simple way by extending the class _ThreadWorker_:
91
92```js
93import { ThreadWorker } from 'poolifier'
94
95function yourFunction(data) {
96 // this will be executed in the worker thread,
97 // the data will be received by using the execute method
98 return { ok: 1 }
99}
100
101module.exports = new ThreadWorker(yourFunction, {
102 maxInactiveTime: 60000
103})
104```
105
106Instantiate your pool based on your needs :
107
108```js
109import { DynamicThreadPool, FixedThreadPool, PoolEvents, availableParallelism } from 'poolifier'
110
111// a fixed worker_threads pool
112const pool = new FixedThreadPool(availableParallelism(), './yourWorker.js', {
113 errorHandler: e => console.error(e),
114 onlineHandler: () => console.info('worker is online')
115})
116
117pool.emitter?.on(PoolEvents.ready, () => console.info('Pool is ready'))
118pool.emitter?.on(PoolEvents.busy, () => console.info('Pool is busy'))
119
120// or a dynamic worker_threads pool
121const pool = new DynamicThreadPool(Math.floor(availableParallelism() / 2), availableParallelism(), './yourWorker.js', {
122 errorHandler: e => console.error(e),
123 onlineHandler: () => console.info('worker is online')
124})
125
126pool.emitter?.on(PoolEvents.full, () => console.info('Pool is full'))
127pool.emitter?.on(PoolEvents.ready, () => console.info('Pool is ready'))
128pool.emitter?.on(PoolEvents.busy, () => console.info('Pool is busy'))
129
130// the execute method signature is the same for both implementations,
131// so you can easily switch from one to another
132pool
133 .execute()
134 .then(res => {
135 console.info(res)
136 })
137 .catch(err => {
138 console.error(err)
139 })
140```
141
142You can do the same with the classes _ClusterWorker_, _FixedClusterPool_ and _DynamicClusterPool_.
143
144**See [examples](./examples/) for more details**:
145
146- [Javascript](./examples/javascript/)
147- [Typescript](./examples/typescript/)
148 - [HTTP client pool](./examples/typescript/http-client-pool/)
149 - [SMTP client pool](./examples/typescript/smtp-client-pool/)
150 - [HTTP server pool](./examples/typescript/http-server-pool/)
151 - [Express worker_threads pool](./examples/typescript/http-server-pool/express-worker_threads/)
152 - [Express cluster pool](./examples/typescript/http-server-pool/express-cluster/)
153 - [Express hybrid pool](./examples/typescript/http-server-pool/express-hybrid/)
154 - [Fastify worker_threads pool](./examples/typescript/http-server-pool/fastify-worker_threads/)
155 - [Fastify cluster pool](./examples/typescript/http-server-pool/fastify-cluster/)
156 - [Fastify hybrid pool](./examples/typescript/http-server-pool/fastify-hybrid/)
157 - [WebSocket server pool](./examples/typescript/websocket-server-pool/)
158 - [ws worker_threads pool](./examples/typescript/websocket-server-pool/ws-worker_threads/)
159 - [ws cluster pool](./examples/typescript/websocket-server-pool/ws-cluster/)
160 - [ws hybrid pool](./examples/typescript/websocket-server-pool/ws-hybrid/)
161
162Remember that workers can only send and receive structured-cloneable data.
163
164## Node.js versions
165
166Node.js versions >= 18.x.x are supported.
167
168## [API](./docs/api.md)
169
170## [General guidelines](./docs/general-guidelines.md)
171
172## [Worker choice strategies](./docs/worker-choice-strategies.md)
173
174## Contribute
175
176Choose your task [here](https://github.com/orgs/poolifier/projects/1), propose an idea, a fix, an improvement.
177
178See [CONTRIBUTING](./CONTRIBUTING.md) guidelines.
179
180## Team
181
182**Creator/Owner:**
183
184- [**Alessandro Pio Ardizio**](https://github.com/pioardi)
185
186**Maintainers:**
187
188- [**Jérôme Benoit**](https://github.com/jerome-benoit)
189
190**Contributors:**
191
192- [**Shinigami92**](https://github.com/Shinigami92)
193
194## License
195
196[MIT](./LICENSE)