How do I use AWS SAM layers in my serverless application?

How do I use AWS SAM layers in my serverless application?

AWS SAM layers allow you to package and share code across multiple serverless functions. You can define layers in your SAM template.

Can you give me an example of a SAM template with layers?

Sure! Here's a simple example:

Resources:
  MyFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: ./my-function
      Handler: app.handler
      Layers:
        - !Ref MyLayer

  MyLayer:
    Type: AWS::Serverless::LayerVersion
    Properties:
      ContentUri: ./my-layer
      CompatibleRuntimes:
        - python3.8

What are the benefits of using layers?

Using layers helps you manage dependencies more efficiently, reduces deployment package size, and promotes code reuse across functions.

Can I use multiple layers in a single function?

Yes, you can specify multiple layers in the Layers property of your function definition in the SAM template.