Nailing Serverless Application Development

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1 Nailing Serverless Application Development Sanath Kumar Ramesh Software Engineer,

2 About Me Sanath Kumar Ramesh, Software Engineer, Obsessed about serverless developer tools since 2016 Built SAM, open sourced SAM implementation, and built SAM CLI Open source enthusiast Previously: Full stack developer at startups Windows Kernel Engineer at Microsoft Designed multicore processors at grad school To-be dad

3 Serverless means No servers to provision or manage Scales with usage Never pay for idle Availability and fault tolerance built in

4 Common Serverless use cases </> IT Automation Data Processing Backends Web Applications Amazon Alexa Chatbots Policy engines Extending AWS services Infrastructure management Real time MapReduce Batch Apps & services Mobile IoT Static websites Complex web apps Packages for Flask and Express Powering voice-enabled apps Alexa Skills Kit Powering chatbot logic

5 Serverless applications EVENT SOURCE FUNCTION SERVICES (ANYTHING) Changes in data state Requests to endpoints Changes in resource state Node.js Python Java C# Go

6 The broader community has also evolved

7 Nailing Application Development Source:

8 Building Web Applications Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod Building Serverless Applications

9 Development workflow is no different #ServerlessIsEasy

10 Building a web app.. Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod Application Code Infrastructure Non-Serverless Serverless

11 Building a web app.. Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod Application Code Non-Serverless Serverless MEAN Stack (Mongo Express Node Angular) MEAN stack + Compatibility Converter Node: aws-serverless-express Java: aws-serverless-java-container Python/Flask: Chalice Python/Django: Zappa

12 Building a web app.. Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod Application Code Non-Serverless Serverless MEAN Stack (Mongo Express Node Angular) MEAN stack + New programming model

13 Building a web app.. Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod Application Code Non-Serverless Serverless MEAN Stack (Mongo Express Node Angular) MEAN stack + New programming model exports.handler = function(event, context) { // Function Handler response = app.run(event) callback(null, response) } Immutable code Stateless Event-driven

14 Focus on the business logic, use tools to help with serverless #ServerlessIsEasy

15 Building a web app.. Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod Infrastructure Non-Serverless Serverless Terraform Terraform AWS CloudFormation AWS CloudFormation AWS SAM Serverless Framework Apex Sparta

16 Meet SAM!

17 AWS SAM Template <-THIS BECOMES THIS-> From:

18 Open Source SAM Toolset SAM Implementation github.com/awslabs/serverless-application-model SAM CLI github.com/awslabs/aws-sam-cli

19 Serverless specific tool will help, but not a necessity #ServerlessIsEasy

20 Building a web app.. Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod Non-Serverless Code + Manifest + Build Tool = Deployment Bundle Serverless Code + Manifest + Build Tool with Serverless Build Plugins = Deployment Bundle (.zip file)

21 Building a web app.. Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod Non-Serverless Code + Manifest + Build Tool = Deployment Bundle Serverless pom.xml

22 Your build tool might already support serverless #ServerlessIsEasy

23 Building a web app.. Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod Non-Serverless Serverless Manually Run Application Locally Unit Tests Integration Tests Manually Run Application Locally Unit Tests Integration Tests

24 Building a web app.. Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod Non-Serverless Serverless Manually Run Application Locally Tools: Node Webserver, Nginx, Apache Webserver etc Manually Run Application Locally with simulated cloud resources Tools: SAM CLI, serverless-offline, LocalStack

25 Local testing is possible, a serverless tool just makes it easier #ServerlessIsEasy

26 Building a web app.. Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod Non-Serverless Serverless Create a dev cluster (usually one per team on separate account) Run Integration Tests Create a dev stack (one per developer on separate account) Run Integration Tests

27 Building a web app.. Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod

28 Building a web app.. Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod Non-Serverless Serverless Jenkins, AWS CodePipeline, AWS CodeBuild, CircleCI, etc Build Package Run Tests Beta, Gamma, Prod Build Package Run Tests Beta, Gamma, Prod $ sam deploy

29 Building a web app.. Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod Non-Serverless Serverless Canary or Blue/Green Deployments Canary or Blue/Green Deployments sam.yaml

30 Building a web app.. Develop Build Test Locally Test on dev cluster Commit to Repo Deploy to Prod

31 Your existing tools work just fine

32 If you can build software, you can build on serverless #ServerlessIsEasy

33 Thank

34 Serverless Application Code (Java, Python, JS etc) Logic as Configura.on (Step Func.ons, APIGW etc) Sta.c Configura.on (S3, SQS, IAM)