Tips and Tricks for Local AWS

Maria Livia Chiorean

Software Developer @ Sky

@MariaLiviaCh

Problem

(Story Time)

The Developer ^-^

A

B

C

Account 1

Account 2

  1. Credentials for account 1;

  2. Credentials for account 2;

  3. Create testing resources for 2 DynamoDB tables, 2 S3 buckets and 1 Kinesis;

  4. Add some test data;

  5. Start app C;

  6. Start app B;

  7. Start app A.

Steps

Solution

Localstack

Docker container

with Localstack image

...

Application

Prerequisites

> brew cask install docker
> brew install docker-compose

docker-compose.yml

version: "3.7"

services:
  localstack:
    image: localstack/localstack
    ports:
      - "4569:4569"
      - "4572:4572"
    environment:
      - SERVICES=dynamodb,s3

sbt-docker-compose plugin

addSbtPlugin("com.tapad" % "sbt-docker-compose" % "1.0.34")

lazy val root = (project in file("."))
  .enablePlugins(DockerComposePlugin)
  .settings(
    name := "localstack-example"
  )

Or simply run:

> docker-compose -d up
> sbt dockerComposeUp

Spin up docker:

Create AWS resources

> brew install awscli

> aws s3api 
    create-bucket
    --endpoint-url=http://localhost:4572 
    --bucket Config
AWSTemplateFormatVersion: "2010-09-09"

Resources:
  ConfigBucket:
    DeletionPolicy: "Retain"
    Type: "AWS::S3::Bucket"
    Properties:
      BucketName: "Config"

Update AWS Client

import software.amazon.awssdk.core.sync.RequestBody
import software.amazon.awssdk.services.s3.S3Client
import software.amazon.awssdk.services.s3.model.PutObjectRequest

val client = S3Client.builder()
    .endpointOverride(URI.create("http://localhost:4572"))
    .build()

val request = PutObjectRequest.builder()
    .bucket("Config")
    .key("application")
    .build()
    
client.putObject(request, RequestBody.fromString("config data"))

Start application

Can we do better?

Write a plugin to do it for you!

Old World :(

 

  1. Install Docker and Docker Compose

  2. Write docker-compose.yml

  3. Spin up Docker

  4. Create resources

  5. Update client to use endpoint-url

  6. Run app

New World :)

 

  1. Install Docker and Docker Compose

  2. Run plugin command

  3. Update client to use endpoint-url

  4. Run app

The sbt-local-aws plugin

  • Spins up a docker container with localstack running.

  • Only starts up the requested AWS services.

  • Automatically creates AWS CLI resource creation commands form available cloudformation.

  • Performs cloudformation substitutions.

  • Commands for start, stop and printing out the commands.

The sbt-local-aws plugin

  • At the moment only works with DynamoDB resources.

  • Only supports yml cloudformation.

Demo

Resources

Special thanks to @OscarTheLargeCat (Instagram)

Tips and Tricks for Running AWS Dependencies Locally

By Maria Livia

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Tips and Tricks for Running AWS Dependencies Locally

Sphere.it 2019

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