cdk-lambda-powertools-python-layer 2.0.3

A lambda layer for AWS Powertools for python

Lambda powertools python layer

Why this project exists

This is a custom construct that will create AWS Lambda Layer with AWS Powertools for Python 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, just 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.

import { LambdaPowertoolsLayer } from 'cdk-lambda-powertools-python-layer';

const powertoolsLayer = new LambdaPowertoolsLayer(this, 'TestLayer');

Python

from cdk_lambda_powertools_python_layer import LambdaPowertoolsLayer

powertoolsLayer = LambdaPowertoolsLayer(self, 'PowertoolsLayer')

Install

TypeSript/JavaScript:

npm i cdk-lambda-powertools-python-layer

Python:

pip install cdk-lambda-powertools-python-layer

Usage

Python

A single line will create a layer with powertools for python:

from cdk_lambda_powertools_python_layer import LambdaPowertoolsLayer

powertoolsLayer = LambdaPowertoolsLayer(self, 'PowertoolsLayer')

You can then add the layer to your funciton:

aws_lambda.Function(self, 'LambdaFunction',
                            code=aws_lambda.Code.from_asset('function'),
                            handler='app.handler',
                            runtime=aws_lambda.Runtime.PYTHON_3_9,
                            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_lambda_powertools_python_layer import LambdaPowertoolsLayer
from constructs import Construct
from typing_extensions import runtime


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',
                            runtime=aws_lambda.Runtime.PYTHON_3_9,
                            layers=[powertoolsLayer])

TypeScript

These examples are for TypeScript:

Build the layer:

import { LambdaPowertoolsLayer } from 'cdk-lambda-powertools-python-layer';

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

Add to your function:

new Function(this, 'LambdaFunction', {
  code: Code.fromAsset(path.join('./function')),
  handler: 'app.handler',
  runtime: Runtime.PYTHON_3_9,
  layers: [powertoolsLayer],
});

You can specify the powertools version:

new LambdaPowertoolsLayer(this, 'PowertoolsLayer', {
  version: '1.21.0'
});

Decide if you want to incldue pydantic as extras dependencies:

new LambdaPowertoolsLayer(this, 'PowertoolsLayer', {
  includeExtras: true
});

Full example:

import { Stack, StackProps } from 'aws-cdk-lib';
import { Construct } from 'constructs';
import { LambdaPowertoolsLayer } from 'cdk-lambda-powertools-python-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',
      runtime: Runtime.PYTHON_3_9,
      layers: [powertoolsLayer],
    });
  }
}