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@middy/warmup

@middy/warmup

v3.1.1

Warmup (cold start mitigation) middleware for the middy framework

npm install @middy/warmup

README

Middy warmup middleware

Middy logo

Warmup middleware for the middy framework, the stylish Node.js middleware engine for AWS Lambda

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You can read the documentation at: https://middy.js.org/docs/middlewares/warmup

Warmup middleware that helps to reduce the cold-start issue. Compatible by default with serverless-plugin-warmup, but it can be configured to suit your implementation.

This middleware allows you to specify a schedule to keep Lambdas that always need to be very responsive warmed-up. It does this by regularly invoking the Lambda, but will terminate early to avoid the actual handler logic from being run.

If you use serverless-plugin-warmup the scheduling part is done by the plugin and you just have to attach the middleware to your "middyfied" handler. If you don't want to use the plugin you have to create the schedule yourself and define the isWarmingUp function to define whether the current event is a warmup event or an actual business logic execution.

Important: AWS recently announced Lambda Provisioned Concurrency. If you have this enabled, you do not need this middleware.

To update your code to use Provisioned Concurrency see:

Install

To install this middleware you can use NPM:

npm install --save @middy/warmup

Options

  • isWarmingUp: (function) a function that accepts the event object as a parameter and returns true if the current event is a warmup event and false if it's a regular execution. The default function will check if the event object has a source property set to serverless-plugin-warmup.

Sample usage

import middy from '@middy/core'
import warmup from '@middy/warmup'

const isWarmingUp = (event) => event.isWarmingUp === true

const originalHandler = (event, context, cb) => {
  /* ... */
}

const handler = middy(originalHandler)
  .use(warmup({ isWarmingUp }))

Middy documentation and examples

For more documentation and examples, refers to the main Middy monorepo on GitHub or Middy official website.

Contributing

Everyone is very welcome to contribute to this repository. Feel free to raise issues or to submit Pull Requests.

License

Licensed under MIT License. Copyright (c) 2017-2022 Luciano Mammino, will Farrell, and the Middy team.

FOSSA Status

Release Notes

3.1.1
By will Farrell • Published on August 4, 2022

What's Changed

  • Add in module to package.json files @willfarrell
  • performance improvements @willfarrell

TypeScript

Docs

New Contributors

Full Changelog: https://github.com/middyjs/middy/compare/3.1.0...3.1.1

3.1.0
By will Farrell • Published on June 21, 2022

What's Changed

New Contributors

Full Changelog: https://github.com/middyjs/middy/compare/3.0.4...3.1.0

3.0.4
By will Farrell • Published on June 4, 2022

What's Changed

New Contributors

Full Changelog: https://github.com/middyjs/middy/compare/3.0.3...3.0.4

3.0.3
By will Farrell • Published on May 17, 2022

What's Changed

New Contributors

Full Changelog: https://github.com/middyjs/middy/compare/3.0.2...3.0.3

3.0.2
By will Farrell • Published on May 13, 2022

What's Changed

New Contributors

Full Changelog: https://github.com/middyjs/middy/compare/3.0.1...3.0.2

3.0.1
By will Farrell • Published on May 13, 2022

What's Changed

  • Updated dependencies

Full Changelog: https://github.com/middyjs/middy/compare/3.0.0...3.0.1

2.5.7
By will Farrell • Published on January 25, 2022

Fix publishing transpiling error in 2.5.6. Thanks to @maximepichou and @rreubenreyes for reporting.

General

License
MIT
Typescript Types
Built-in
Tree-shakeable
Yes

Popularity

GitHub Stargazers
3,038
Community Interest
2,905
Number of Forks
293

Maintenance

Commits
11/2110/220250
Last Commit
Open Issues
5
Closed Issues
410
Open Pull Requests
1
Closed Pull Requests
149

Versions

Versions Released
11/2110/22010
Latest Version Released
Aug 4, 2022
Current Tags
latest3.1.1
next3.1.0-rc.1

Dependencies

Dependencies (0)
Dev Dependencies (1)

Contributors

willfarrell
willfarrell
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lmammino
lmammino
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greenkeeper[bot]
greenkeeper[bot]
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vladgolubev
vladgolubev
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thejuan
thejuan
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dkatavic
dkatavic
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gsingh1
gsingh1
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joseSantacruz
joseSantacruz
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theburningmonk
theburningmonk
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leog
leog
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ossareh
ossareh
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JimiPedros
JimiPedros
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munierujp
munierujp
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sdomagala
sdomagala
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denovodavid
denovodavid
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