Example Python CDK Bundling

With the PythonFunction CDK Construct the CDK attempts to use Docker to bundle the dependencies within the generated CloudArtifact or construct package. For an unknown reason this fails when using a Docker environment like GitHub Actions.

Issues tracking this:

As an alternative this project demonstrates using the localBundling CDK option with Python to generate the compatible CloudArtifact. Hopefully this will be resolved soon and no longer necessary.

import * as cdk from '@aws-cdk/core';
import { Code, Runtime, Function} from '@aws-cdk/aws-lambda';
import * as path from 'path';
import { execSync } from 'child_process';

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

    const functionDir = path.join(__dirname, "functions", "exampleFunction")

    const exampleFunction = new Function(this, "ExampleFunction", {
      handler: 'index.handler',
      runtime: Runtime.PYTHON_3_8,
      code: Code.fromAsset(functionDir, {
        bundling: {
          image: Runtime.PYTHON_3_8.bundlingImage,
          local: {
            tryBundle(outputDir: string) {
              try {
                execSync('pip3 --version')
              } catch {
                return false
              }

              execSync(`pip install -r ${path.join(functionDir, "requirements.txt")} -t ${path.join(outputDir)}`)
              execSync(`cp -au ${functionDir}/* ${path.join(outputDir)}`)
              return true
            }
          }
        }
      })
    })
  }
}

1davidmichael/cdk-local-bundling-example

Example Python CDK Bundling