python-publish-lambda-layer.yml

name: "Python: Publish Lambda Layer"

on:
  workflow_dispatch:
    inputs:
      package_version:
        description: 'Package version to download'
        required: true
        type: string
      layer_version:
        description: 'Layer version'
        required: true
        type: string
      python_version:
        description: 'Python version'
        required: true
        default: 'ALL'
        type: choice
        options: ['ALL', '3.10', '3.11', '3.12', '3.13']
      architecture:
        description: 'Architecture'
        required: true
        default: 'ALL'
        type: choice
        options: ['ALL', 'x86_64', 'aarch64']
      region:
        description: 'AWS region'
        required: true
        default: 'ALL'
        type: choice
        # Only non opt-in regions included for now
        options: ['ALL', 'us-east-1', 'us-east-2', 'us-west-1', 'us-west-2', 'ap-south-1', 'ap-northeast-1', 'ap-northeast-2', 'ap-northeast-3', 'ap-southeast-1', 'ap-southeast-2', 'ca-central-1', 'eu-central-1', 'eu-west-1', 'eu-west-2', 'eu-west-3', 'eu-north-1', 'sa-east-1']
      confirm:
        description: 'Type "Create Lambda Layer {PyPI version}-layer{layer version}" to confirm publishing the layer'
        required: true
        type: string

jobs:
  validate:
    runs-on: strands-agents_ubuntu-latest_4-core
    permissions: {}
    steps:
      - name: Validate confirmation
        run: |
          CONFIRM="${{ inputs.confirm }}"
          EXPECTED="Create Lambda Layer ${{ inputs.package_version }}-layer${{ inputs.layer_version }}"
          if [ "$CONFIRM" != "$EXPECTED" ]; then
            echo "Confirmation failed. You must type exactly '$EXPECTED' to proceed."
            exit 1
          fi
          echo "Confirmation validated"

  package-and-upload:
    needs: validate
    runs-on: strands-agents_ubuntu-latest_4-core
    strategy:
      matrix:
        python-version: ${{ inputs.python_version == 'ALL' && fromJson('["3.10", "3.11", "3.12", "3.13"]') || fromJson(format('["{0}"]', inputs.python_version)) }}
        architecture: ${{ inputs.architecture == 'ALL' && fromJson('["x86_64", "aarch64"]') || fromJson(format('["{0}"]', inputs.architecture)) }}
        region: ${{ inputs.region == 'ALL' && fromJson('["us-east-1", "us-east-2", "us-west-1", "us-west-2", "ap-south-1", "ap-northeast-1", "ap-northeast-2", "ap-northeast-3", "ap-southeast-1", "ap-southeast-2", "ca-central-1", "eu-central-1", "eu-west-1", "eu-west-2", "eu-west-3", "eu-north-1", "sa-east-1"]') || fromJson(format('["{0}"]', inputs.region)) }}

    permissions:
      id-token: write

    steps:
      - name: Set up Python
        uses: actions/setup-python@v7.0.0
        with:
          python-version: ${{ matrix.python-version }}

      - name: Configure AWS credentials
        uses: aws-actions/configure-aws-credentials@v6
        with:
          role-to-assume: ${{ secrets.STRANDS_LAMBDA_LAYER_PUBLISHER_ROLE }}
          aws-region: ${{ matrix.region }}

      - name: Create layer directory structure
        run: |
          mkdir -p layer/python

      - name: Download and install package
        run: |
          pip install strands-agents==${{ inputs.package_version }} \
            --python-version ${{ matrix.python-version }} \
            --platform manylinux2014_${{ matrix.architecture }} \
            -t layer/python/ \
            --only-binary=:all:

      - name: Create layer zip
        run: |
          cd layer
          zip -r ../lambda-layer.zip .

      - name: Upload to S3
        run: |
          PYTHON_VERSION="${{ matrix.python-version }}"
          ARCH="${{ matrix.architecture }}"
          REGION="${{ matrix.region }}"
          LAYER_NAME="strands-agents-py${PYTHON_VERSION//./_}-${ARCH}"
          ACCOUNT_ID=$(aws sts get-caller-identity --query Account --output text)
          BUCKET_NAME="strands-layer-${ACCOUNT_ID}-${{ secrets.STRANDS_LAMBDA_LAYER_BUCKET_SALT }}-${REGION}"
          LAYER_KEY="$LAYER_NAME/${{ inputs.package_version }}/layer${{ inputs.layer_version }}/lambda-layer.zip"

          aws s3 cp lambda-layer.zip "s3://$BUCKET_NAME/$LAYER_KEY" --region "$REGION"
          echo "Uploaded layer to s3://$BUCKET_NAME/$LAYER_KEY"

  publish-layer:
    needs: package-and-upload
    runs-on: strands-agents_ubuntu-latest_4-core
    strategy:
      matrix:
        python-version: ${{ inputs.python_version == 'ALL' && fromJson('["3.10", "3.11", "3.12", "3.13"]') || fromJson(format('["{0}"]', inputs.python_version)) }}
        architecture: ${{ inputs.architecture == 'ALL' && fromJson('["x86_64", "aarch64"]') || fromJson(format('["{0}"]', inputs.architecture)) }}
        region: ${{ inputs.region == 'ALL' && fromJson('["us-east-1", "us-east-2", "us-west-1", "us-west-2", "ap-south-1", "ap-northeast-1", "ap-northeast-2", "ap-northeast-3", "ap-southeast-1", "ap-southeast-2", "ca-central-1", "eu-central-1", "eu-west-1", "eu-west-2", "eu-west-3", "eu-north-1", "sa-east-1"]') || fromJson(format('["{0}"]', inputs.region)) }}

    permissions:
      id-token: write

    steps:
      - name: Configure AWS credentials
        uses: aws-actions/configure-aws-credentials@v6
        with:
          role-to-assume: ${{ secrets.STRANDS_LAMBDA_LAYER_PUBLISHER_ROLE }}
          aws-region: ${{ matrix.region }}

      - name: Publish layer
        run: |
          PYTHON_VERSION="${{ matrix.python-version }}"
          ARCH="${{ matrix.architecture }}"
          REGION="${{ matrix.region }}"
          LAYER_NAME="strands-agents-py${PYTHON_VERSION//./_}-${ARCH}"
          ACCOUNT_ID=$(aws sts get-caller-identity --query Account --output text)
          REGION_BUCKET="strands-layer-${ACCOUNT_ID}-${{ secrets.STRANDS_LAMBDA_LAYER_BUCKET_SALT }}-${REGION}"
          LAYER_KEY="$LAYER_NAME/${{ inputs.package_version }}/layer${{ inputs.layer_version }}/lambda-layer.zip"

          DESCRIPTION="PyPI package: strands-agents v${{ inputs.package_version }} (Python $PYTHON_VERSION, $ARCH)"

          # Set compatible architecture based on matrix architecture
          if [ "$ARCH" = "x86_64" ]; then
            COMPATIBLE_ARCH="x86_64"
          else
            COMPATIBLE_ARCH="arm64"
          fi

          LAYER_OUTPUT=$(aws lambda publish-layer-version \
            --layer-name $LAYER_NAME \
            --description "$DESCRIPTION" \
            --content S3Bucket=$REGION_BUCKET,S3Key=$LAYER_KEY \
            --compatible-runtimes python${{ matrix.python-version }} \
            --compatible-architectures $COMPATIBLE_ARCH \
            --region "$REGION" \
            --license-info Apache-2.0 \
            --output json)

          LAYER_ARN=$(echo "$LAYER_OUTPUT" | jq -r '.LayerArn')
          LAYER_VERSION=$(echo "$LAYER_OUTPUT" | jq -r '.Version')

          echo "Published layer version $LAYER_VERSION with ARN: $LAYER_ARN in region $REGION"

          aws lambda add-layer-version-permission \
            --layer-name $LAYER_NAME \
            --version-number $LAYER_VERSION \
            --statement-id public \
            --action lambda:GetLayerVersion \
            --principal '*' \
            --region "$REGION"
      
          echo "Successfully published layer version $LAYER_VERSION in region $REGION"