Video - Swift, Server-Side, Serverless - Sébastien Stormacq

Similar Talks

• https://www.youtube.com/watch?v=ZLL4_GnlGWI

What is Serverless

00:48

• it means you don’t have to manage the server
• it scales with usage
• Built-in availability and fault tolerance
• pay for the value
  • pay only for what you use.
• AWS Lambda is a serverless solution provided by Amazon AWS
  • 02:56 lambda functions can be called with a REST API gateway, GraphQL, Database change, message queue, schedule or many other things.

How to set up a lambda function

04:03

How to deploy

04:57

• You can deploy through the online console
• It’s better to deploy using AWS CLI
• IAC: Infrastructure as Code
• SAM: Serverless Application Model: 06:02
  • yaml file description of your infrastructure
  • sam deploy CLI command

How much does it cost

07:04

• Almost free to develop and test
• charged by ms of CPU time
• price per million requests
• generous free tier

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Deploy an Existing Web App on Lambda

08:23

• 
• 
• Lambda runs on EC2 virtual machines
  • inside a MicroVM
• Vapor and Hummingbird provide a library that adapts your web app code to lambda
• But today I will be demonstrating a solution that is more generic that can be applied to any type of web app (Express, Java etc.)
  • To use this you must add 3 or 4 pieces
    • Must add an API gateway
    • lambda extension can intercept a lambda function call and convert it into an HTTP request that your web app can understand
    • Your web app must be put in a docker container
      • You only need to add one line to your docker file:
        • COPY --from=public.ecr.aws/awsguru/aws-lambda-adapter:0.6.4 /lambda-adapter jopt/extensions/lambda-adapter
    • This doesn’t require any code change at all
    • 
    • Write a SAM template
      • 
      • You provide:
        • the web app
        • the docker container
        • the SAM template yaml
      • SAM will generate:
        • the API gateway
        • the AWS lambda function adapter around your web app
      • SAM CLI
        • sam build
        • sam deploy
  • see repo: github.com/awslabs/aws-lambda-web-adaptor

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How to write Lambda functions in Swift

14:35

• AWS Lambda Custom Runtime:

Using swift-aws-lambda-runtime

• 17:57
• add dependency: swift-aws-lambda-events:
  • provides various event triggers
• Note: the code in these slides could change. They are not API stable yet.

How to build and package?

20:41

• swift package --disable-sandbox archive
  • it will create a docker container with the swift runtime for amazon linux. compiles your code to a binary and create a zip file ready to deploy on lambda
• How do you deploy the zip file? 22:09
  • You need to deploy more than just the zip file. you need the api gateway and other things
  • There are 2 plugins that can deploy to lambda:
    • AWSLambdaPackager:
      • developed by Apple
    • AWSLambdaDeployer:
      • developed by sebastien stormacq
      • swift package --disable-sandbox deploy
• AWSLambdaDeploymentDescriptor:
  • Swift replacement for SAM

Testing

• SAM local testing:
  • 25:34

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VS Code extension for Lambda Swift

28:09