leox-cdk-aws-lambda-powertools-layer 0.0.0

Powertools for AWS Lambda layer for python and typescript

Powertools for AWS Lambda Layer

Why this project exists

This is a custom construct that will create AWS Lambda Layer with Powertools for AWS Lambda for Python or NodeJS library. There are different ways how to create a layer and when working with CDK you need to install the library, create a zip file and wire it correctly. With this construct you don't have to care about packaging and dependency management. Create a construct and add it to your function. The construct is an extension of the existing LayerVersion construct from the CDK library, so you have access to all fields and methods.

⚠️ This construct uses docker to build and bundle the dependencies!

See the API for details.

import {LambdaPowertoolsLayer} from 'cdk-aws-lambda-powertools-layer';
import {RuntimeFamily } from "aws-cdk-lib/aws-lambda";

  const powertoolsLayerPython = new LambdaPowertoolsLayer(this, 'TestLayer', {runtimeFamily: RuntimeFamily.PYTHON});
  const powertoolsLayerNodeJS = new LambdaPowertoolsLayer(this, 'TestLayer', {runtimeFamily: RuntimeFamily.NODEJS});

Python

from cdk_aws_lambda_powertools_layer import LambdaPowertoolsLayer

powertoolsLayer = LambdaPowertoolsLayer(self, 'PowertoolsLayer')

The layer will be created during the CDK synth step and thus requires Docker.

Install

TypeSript/JavaScript:

npm i cdk-aws-lambda-powertools-layer

Python:

pip install cdk-aws-lambda-powertools-layer

Usage

Python

A single line will create a layer with Powertools for AWS Lambda (Python). For NodeJS you need to specifically set the runtimeFamily: Runtime.NODEJS property.

from cdk_aws_lambda_powertools_layer import LambdaPowertoolsLayer

powertoolsLayer = LambdaPowertoolsLayer(self, 'PowertoolsLayer')

You can then add the layer to your funciton:

from aws_cdk import aws_lambda

aws_lambda.Function(self, 'LambdaFunction',
                            code=aws_lambda.Code.from_asset('function'),
                            handler='app.handler',
                            layers=[powertoolsLayer])

You can specify the powertools version by passing the optional version paramter, otherwise the construct will take the latest version from pypi repository.

LambdaPowertoolsLayer(self, 'PowertoolsLayer', version='1.24.0')

Additionally, powertools have extras depenedncies such as Pydantic, documented here. This is not included by default, and you have to set this option in the construct definition if you need it:

LambdaPowertoolsLayer(self, 'PowertoolsLayer', include_extras=True)

Full example:

from aws_cdk import Stack, aws_lambda
from cdk_aws_lambda_powertools_layer import LambdaPowertoolsLayer
from constructs import Construct


class LayerTestStack(Stack):

    def __init__(self, scope: Construct, construct_id: str, **kwargs) -> None:
        super().__init__(scope, construct_id, **kwargs)

        powertoolsLayer = LambdaPowertoolsLayer(
            self, 'PowertoolsLayer', include_extras=True, version='1.24.0')

        aws_lambda.Function(self, 'LambdaFunction',
                            code=aws_lambda.Code.from_asset('function'),
                            handler='app.handler',
                            layers=[powertoolsLayer])

TypeScript

Full example for TypeScript:

import { Stack, StackProps } from 'aws-cdk-lib';
import { Construct } from 'constructs';
import { LambdaPowertoolsLayer } from 'cdk-aws-lambda-powertools-layer';
import { Code, Function, Runtime } from 'aws-cdk-lib/aws-lambda';
import * as path from 'path';

export class CdkPowertoolsExampleStack extends Stack {
  constructor(scope: Construct, id: string, props?: StackProps) {
    super(scope, id, props);

    const powertoolsLayer = new LambdaPowertoolsLayer(this, 'TestLayer', {
      version: '1.22.0',
      includeExtras: true
    });

    new Function(this, 'LambdaFunction', {
      code: Code.fromAsset(path.join('./function')),
      handler: 'app.handler',
      layers: [powertoolsLayer],
    });
  }
}