https://github.com/mcollina/fastify-single-user-cache

https://github.com/mcollina/fastify-single-user-cache

Last synced: 12 days ago
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• Host: GitHub
• URL: https://github.com/mcollina/fastify-single-user-cache
• Owner: mcollina
• License: mit
• Created: 2019-03-08T17:46:09.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2019-04-19T10:11:02.000Z (over 5 years ago)
• Last Synced: 2024-12-20T02:37:56.297Z (20 days ago)
• Language: JavaScript
• Size: 6.84 KB
• Stars: 4
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# fastify-single-user-cache

[![Build

Status](https://travis-ci.com/mcollina/fastify-single-user-cache.svg?branch=master)](https://travis-ci.com/mcollina/fastify-single-user-cache)

Provide a cache for each request, so multiple fetches of the same data

are not performed. Moreover, it provides an API to batch requests, so

that a bulk query can be done to a database or an external endpoint.

The core caching functionality is provided by

[single-user-cache](http://npm.im/single-user-cache).

This is similar to Facebook Data Loader pattern.

## Install

```

npm i fastify-single-user-cache

```

## Usage

```js

const fastify = require('fastify')

const app = fastify()

app.register(require('fastify-single-user-cache'), {

  // key  is the property that is going to be decorated in the

  // app, Request and Reply

  key: 'data'

})

// We wrap our data definitions and routes in a plugin, so

// the cache plugin can actually load asynchronously.

app.register(async function (app) {

  // The result of this functions will be caches for the lifetime

  // of the request.

  app.data.add('fetchSomething', async (queries, { req, reply }) => {

    // queries include an array of all the requested ids

    reply.log.info({ queries }, 'executing fetchSomething')

    // It must return an array of length queries.length.

    return queries.map((k) => {

      return { k }

    })

  })

  app.get('/', async (req, reply) => {

    const data = await Promise.all([

      reply.data.fetchSomething(42),

      reply.data.fetchSomething(24)

    ])

    return data

  })

})

app.listen(3000)

```

## License

MIT