serverless-docker/lib/registry/data.js

This is a proof of concept to see if we can replicate Amazon API Gateway using docker images to run lambda

'use strict'

const BbPromise = require('bluebird')
const low = require('lowdb')
const fileAsync = require('lowdb/lib/storages/file-async')

const FUNCTIONS_KEY = 'functions'
const DATA_VERSION = 1

const createDb = (dbPath) => {
  const db = low(dbPath, {
    storage: fileAsync,
  })

  db.defaults({
    [FUNCTIONS_KEY]: {},
  })
  .write()

  return db
}

const getFunction = (db, functionIdentifier) => {
  const func = db.get(FUNCTIONS_KEY)
                .get(functionIdentifier)
                .value()
  return func ?
    BbPromise.resolve(func.config) :
    BbPromise.reject(new Error(`Cannot find function ${functionIdentifier}`))
}


const putFunction = (db, functionConfig) =>
  db.get(FUNCTIONS_KEY).set(functionConfig.key, {
    version: DATA_VERSION,
    config: functionConfig,
  })
  .write()

const putFunctions = (db, functions) =>
  functions.reduce((op, func) =>
    op.set(func.key, {
      version: DATA_VERSION,
      config: func,
    }),
    db.get(FUNCTIONS_KEY)
  ).write()

module.exports = {
  createDb,
  getFunction,
  putFunction,
  putFunctions,
}