gomplate-lambda-extension

a Gomplate extension for AWS Lambda

Getting Started

The example directory provides a sample Terraform module that can be used to provision a Lambda function with this extension enabled.

Prereqs:

• Terraform v1+
• An AWS Account

cd example
terraform init
terraform apply

Installation

Lambda layer For Lambda functions that use .zip deployments, include the following ARN as a layer in your Lambda function:

arn:aws:lambda:us-west-2:010013098410:layer:gomplate-lambda-extension:4

or publish your own layer:

just publish

Embed within Lambda container image
For Lambda functions that use container images, install the extension as part of the container build:

ADD https://github.com/cludden/gomplate-lambda-extension/releases/v0.1.0/download/gomplate-lambda-extension_0.1.0_linux_amd64 /opt/extensions/gomplate-lambda-extension

Configuration

The extension is configured via Lambda environment variables.

Name	Description
GOMPLATE_DATASOURCE_{name}	defines a named datasource
GOMPLATE_INPUT	anonymous input template (either inline or file path)
GOMPLATE_INPUT_{name}	configures a named template with an associated input file path
GOMPLATE_OUTPUT	output file path (e.g. /tmp/config.json)
GOMPLATE_OUTPUT_{name}	configures a named template output file path

The extension supports either a single anonymous template:

# inline
GOMPLATE_INPUT={"foo":"{{ (getenv "FOO" "bar") }}"}
GOMPLATE_OUTPUT=/tmp/config.json

# filesystem
GOMPLATE_INPUT=/tmp/config.tpl.json
GOMPLATE_OUTPUT=/tmp/config.json

or one or more named templates:

GOMPLATE_INPUT_config=/tmp/config.tpl.json
COMPLATE_OUTPUT_config=/tmp/config.json
COMPLATE_INPUT_data=/tmp/data.tpl.yml
COMPLATE_OUTPUT_data=/tmp/data.yml

License

Licensed under the MIT License
Copyright (c) 2022 Chris Ludden