⚡ Physis Serverless Basic APIS

We are using dynamodb with dynamoose setup

Basic implementation of JSON API endpoints for creating, reading, update and delete (CRUD) for a generic data structure called just item with the interest of making of this a boilerplate for quick starting projects based on Serverless Framework focused in AWS Lambda.

Features

• Includes webpack 4 support for packaging and including babel transpilation.
• Yarn support (previous versions of serverless webpack did not have well yarn support).
• Complete supprt for ES6+ syntax up to stage 2.
• Basic schema for "Item" model with Dynamoose.
• Create, Read, Update, Delete, List and Batch creation of items.
• In the case of new item data entries it includes auto id creation based on uuid/v1.
• Handlers only manages IO.
• Error parsing, logging and response to endpoint.
• API Gateway path described for every http verb included.

Starting

$ yarn
$ export AWS_PROFILE="Your AWS credentials profile"
$ serverless deploy

Adding a new Lambda Function

📢 Highlight

Every handler is built inside a template strutured for reusing with the folowing parts:

export const handler = async ({ body }, context, callback) => {
  // Action invocation through promisified method
  // handleErr and to are declared below.
  const [err, result] = await to(crudItem(body))

  // Error handling
  if (err) {
  callback(null, handleErr(err))
  } else {
    // Response construction
    const response = {
      statusCode: 200,
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(result)
    }

    console.log(` => Action logging...`)
    callback(null, response)
  }
}

// 🚧 Outside the handler 🚧
// Function responsible of data manipulation (✨ Where magic happens)
const crudItem = data => {
  const itemData = JSON.parse(data)
  // Dynamoose promisified API method for data manipulation
  return Item.crud()
}

// *** Error handling support in promises
const to = promise =>
  promise
    .then(data => [null, data])
    .catch(err => [pe(err)]) // parse-error (npm module)

const handleErr = (error, statusCode = 500) => {
  console.error(' => ERROR:', error.stack)

  return {
    statusCode,
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ error })
  }
}

Endpoint description

Basic Endpoint Structure

GET -> `https://[api-gateway-code].execute-api.[aws-region].amazonaws.com/[stage]/api/

All the other endpoint list is TBA

😎 Happy Coding and Enjoy. Peace!! 🤘