Runway module using locally stored lookups to get the current lambda function s3 key

README.md

Overview

.
├── dev-us-east-1.env
├── local_lookups
│   ├── awslambda.py
│   └── __init__.py
├── my_function
│   ├── index.py
│   └── __init__.py
├── stacks.yaml
└── templates
    └── function.yaml

Instructions

1. Create the local_lookups directory into your CFN module, with an empty __init__.py file and the awslambda.py file detailed below.
2. Ensure your stack configuration module has:

• sys_path: ./ set
• The 2 custom lookups (lambda_upload_bucket & lambda_upload_key) defined

3. Use the lookups in conjunction with the upload_lambda_functions hook as shown in the example stacks.yaml config.

In this example, the function MyFunction is uploaded from the directory my_function with its upload information stored in the "data_key" lambda. The upload information is then referenced for the LambdaBucket/LambdaKey parameters in the form of data_key::function_name

awslambda.py

#!/usr/bin/env python
"""Helper classes for Runway CFN AWS Lambda hook."""


def bucket(value, context, **kwargs):  # pylint: disable=unused-argument
    """Extract the S3 bucket for a given package in hook_data.

    Format of value:
        <hook_name>::<key>
    """
    try:
        hook_name, hook_key = value.split("::")
    except ValueError:
        raise ValueError("Invalid value for hook_data: %s. Must be in "
                         "<hook_name>::<key> format." % value)

    code = context.hook_data[hook_name][hook_key]
    return code.to_dict()['S3Bucket']


def key(value, context, **kwargs):  # pylint: disable=unused-argument
    """Extract the S3 key for a given package in hook_data.

    Format of value:
        <hook_name>::<key>
    """
    try:
        hook_name, hook_key = value.split("::")
    except ValueError:
        raise ValueError("Invalid value for hook_data: %s. Must be in "
                         "<hook_name>::<key> format." % value)

    code = context.hook_data[hook_name][hook_key]
    return code.to_dict()['S3Key']

stacks.yaml

namespace: ${namespace}
cfngin_bucket: ${cfngin_bucket_name}

sys_path: ./

lookups:
  lambda_upload_bucket: local_lookups.awslambda.bucket
  lambda_upload_key: local_lookups.awslambda.key

pre_build:
  - path: runway.cfngin.hooks.aws_lambda.upload_lambda_functions
    required: true
    data_key: lambda
    args:
      functions:
        MyFunction:
          path: ./my_function
          include:
            - '*.py'
            - '*.txt'
          exclude:
            - '*.pyc'
            - test/

stacks:
  - name: functionstack
    template_path: templates/function.yaml
    variables:
      LambdaRole: arn...REPLACEME
      LambdaBucket: ${lambda_upload_bucket lambda::MyFunction}
      LambdaKey: ${lambda_upload_key lambda::MyFunction}