Persist-store NPM

persist-store

persist-store enables you to persist files across data stores (locally, S3, custom data store).

Install

npm install persist-store --save

Usage

const Persist = require('persist-store')

// Under the hood, persist-store uses Promises, so
// custom persisters should implement promises

class LogIt {
  save(file, value) {
    return Promise.resolve('this does nothing')
  }
  load(file) {
    return Promise.resolve('shh, act like i loaded something')
  }
}

// example options
const persist = new Persist([
    {
      type: 'local',
      path: './data/file',
    },
    {
      type: 's3',
      bucket: 'a_bucket',
      key: 'some_prefix/the_key',
      accessKeyId: '1234',
      secretAccessKey: '4567'
    },
    {
      type: 'custom',
      implementation: new LogIt()
    }
])

persist.save('file', '2017-04-04T12:00:00Z')

If no services are given, only a local persister is created and files are saved in $HOME/.persist

API

store#save(fileName, contents)

Saves a file across all stores

persist.save('file', '2017-04-04T12:00:00Z')

store#load(fileName)

Checks all data stores for the file, makes sure they are all equal, then returns the value

persist
  .load('file')
  .then((file) => {
    console.log(`Here is the file: ${file}`)
  })
  .catch((error) => {
    console.error(`Something happened:`, { error: String(error.stack || error) })
  })

Testing

If you want to mock the S3 persist-store in a test, you can pass localPath along with bucket and S3 will use ${localPath}/${bucket} as a mock S3 bucket