AWS CloudFormation Resource Provider Java Plugin

The CloudFormation CLI (cfn) allows you to author your own resource providers that can be used by CloudFormation.

This plugin library helps to provide Java runtime bindings for the execution of your providers by CloudFormation.

Usage

If you are using this package to build resource providers for CloudFormation, install the CloudFormation CLI Java Plugin - this will automatically install the the CloudFormation CLI! A Python virtual environment is recommended.

Prerequisites

• Python version 3.8 or above
• Your choice of Java IDE
• Lombok: The code generated by the CloudFormation CLI uses Lombok, which requires support in IDEs for some syntax highlighting to work. For the best development experience, it is recommended you install Lombok support in your IDE.

Installation

pip3 install cloudformation-cli-java-plugin

Refer to the CloudFormation CLI User Guide for the CloudFormation CLI for usage instructions.

Alternate Type Formats

The format keyword can be specified on primitive types defined in a resource provider's schema to allow the CloudFormation CLI Java Plugin to generate more than the defaults for primitive types. Consult the table below for what formats are available and defaults for various types. The default value is used if omitted:

JSON Schema Type	Format value	Generated variable type
boolean	default	Boolean
integer	default, int32	Integer
integer	int64	Long
number	default	Double
string	default	String

For example, the below schema for a property would generate a variable of type Long.

{
    "type": "integer",
    "format": "int64"
}

Development

For changes to the plugin, a Python virtual environment is recommended. Check out and install the plugin in editable mode:

python3 -m venv env
source env/bin/activate
pip3 install -e /path/to/cloudformation-cli-java-plugin

Install pytest-cov, used when running unit tests for this plugin:

pip3 install pytest-cov

You may also want to check out the CloudFormation CLI if you wish to make edits to that. In this case, installing them in one operation works well:

pip3 install \
  -e /path/to/cloudformation-cli \
  -e /path/to/cloudformation-cli-java-plugin

That ensures neither is accidentally installed from PyPI.

Linting and running unit tests is done via pre-commit, and so is performed automatically on commit after being installed (pre-commit install). The continuous integration also runs these checks. Manual options are available so you don't have to commit:

# run all hooks on all files, mirrors what the CI runs
pre-commit run --all-files
# run unit tests only. can also be used for other hooks, e.g. black, flake8, pylint-local
pre-commit run pytest-local

License

This library is licensed under the Apache 2.0 License.