fastify-peekaboo
fastify plugin for memoize responses by expressive settings
Last updated 3 months ago by simone.sanfra .
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fastify-peekaboo

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fastify plugin for memoize responses by expressive settings.

Purpose

Use arbitrary cache to serve responses from previous elaboration, matching them by request and response.

Installing

npm i fastify-peekaboo

Quick start

const fastify = require('fastify')
const peekaboo = require('fastify-peekaboo')
const fs = require('fs')

const _fastify = fastify()
_fastify.register(peekaboo, {
  // default settings: cache good stuff for 1 day
  rules: [{
    request: {
      methods: true,
      route: true
    },
    response: {
      status: (code) => code > 199 && code < 300
    }
  }],
  mode: 'memoize',
  storage: { mode: 'memory' },
  expire: 86400000, // 1 day in ms
  xheader: true,
  log: false
})

_fastify.get('/home', async (request, response) => {
  const _home = 'welcome!'
  response.send(_home)
})

_fastify.get('/image', async (request, response) => {
  response.send(fs.createReadStream('image.png'))
})

await _fastify.listen(80)

First call to /home or /image will execute the handler; from second time content will be served straight from the cache without running the handlers.

Cache storage can be memory (ram), fs.

Storage and dataset

dataset feature allow to have different caches and switching between them.

Example: create a new dataset and use it

fastify.post('/dataset', async (request, response) => {
  try {
    const id = await _fastify.peekaboo.dataset.create(request.body.name)
    await _fastify.peekaboo.dataset.set(id)
    response.send({ id })
  } catch (error) {
    response.send({ message: error.message })
  }
})

See documentation for full information and examples.

Upgrade from v.1 to v.2

If you are using memory storage, cache is volatile, no action is required.
In order to keep cache using fs storage, move dir and content from peekaboo to peekaboo/default; otherwise, a new empty cache is created.

Update API calls for set.mode and get.mode to mode.set and mode.get.

Settings

Cache works by matching request and response.
If request (and response) match, response is saved by hashing the matching request.
The first rule that match the request is choosen.

settings

{
  rules: MatchingRule[],
  mode: Mode,
  storage: Storage,
  expire: number,
  xheader: boolean,
  noinfo: boolean
}

settings.rules

The set of rules that indicate to use cache or not for requests.
See matching system for details.

settings.mode

type: string, one of memoize, off, collector, stock default: memoize

It set how the cache system behave:

  • memoize
    on each request, if the relative cache entry is present serve that, or elaborate and cache on response if it doesn't
  • collector
    cache entries but don't use cache for serve responses
  • stock
    serve only responses from cache or 404 if the cache entry does not exists
  • off
    the plugin is not used at all

You can get/set also at runtime by

fastify.get('/cache/mode', async (request, response) => {
  response.send({ mode: fastify.peekaboo.mode.get() })
})
fastify.get('/cache/mode/:mode', async (request, response) => {
  fastify.peekaboo.mode.set(request.params.mode)
  response.send('set mode ' + request.params.mode)
})

settings.storage

  • mode
    type: string [ memory | fs ]
    default: memory

    • memory (default) cache use runtime memory
    • fs use filesystem, need also config.path
  • storage config
    type: object

    for file mode

    • path
      type: string
      dir path where files will be stored
    {
      mode: 'memory'
    }
    
    {
      mode: 'fs',
      config: { path: '/tmp/peekaboo' }
    }
    

See storage documentation for further information about to access and manipulate entries.

settings.expire

type: number
default: 86400000 // 1 day
cache expiration in ms, optional.

settings.xheader

type: boolean
default: true
add on response header x-peekaboo and x-peekaboo-hash if response comes from cache.

settings.noinfo

type: boolean
default: false
do not store info (matching rule, request) for entries, in order to speed up a little bit in write/read cache and save space; info are needed only for cache manipulation.

Log

Use server log settings

fastify({ logger: true })

Documentation

See documentation for further information and examples.


Changelog

  • v. 2.2.0 [ 2020-10-11 ]

    • update matching function allow cache based on values, see notes
    • update documentation
    • update deps
  • v. 2.0.0 [ 2020-09-25 ]

    • add dataset feature
    • update mode public methods
  • v. 1.3.0 [ 2020-07-25 ]

    • stable version
    • update to fastify v3
    • update deps
  • v. 1.2.0-beta [ 2020-06-18 ] beta

    • move to beta stage
    • fix fs storage persistence
    • add mode (memoize, off, collector, stock)
    • add storage access for editing: get, list, set, rm, clear
    • add info in stored entries and settings.noinfo to skip that
    • add x-peekaboo-hash in xheader
  • v. 1.1.0-alpha [ 2020-05-14 ] alpha

    • drop keyv storage
  • v. 1.0.0-alpha [ 2020-05-03 ] alpha

    • new matching system
    • drop redis storage
    • 100% test coverage
    • validate settings with superstruct
  • v. 0.5.0-beta [ 2020-04-30 ] beta

    • upgrade dependencies
  • v. 0.4.0-beta [ 2019-05-21 ] beta

  • v. 0.1.0-alpha [ 2018-12-27 ] alpha

    • first release

Roadmap

v. 2.3

  • [ ] remove got in favor of natvie http client
  • [ ] response.rewrite option
  • [ ] request.rewrite option
  • [ ] postgresql storage
  • [ ] redis storage

v. 2.4

  • [ ] doc: real world examples
  • [ ] benchmark plugin overhead (autocannon?)
    • [ ] benchmark with different storages
  • [ ] support binary request/response (upload, download)
  • [ ] test edge cases
    • [ ] querystring array or object
  • [ ] preset recipes (example graphql caching)
  • [ ] CI

v. 2.5

  • [ ] fine grained settings (storage, expiration, xheader ...) for each rule
  • [ ] invalidate cache (by ...?)
  • [ ] expire can be a function(request, response)

License

The MIT License (MIT)

Copyright (c) 2018-2020 Simone Sanfratello

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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