samvars: SAM vars.json Generator

Overview

This script, in python or bash, generates vars.json, a file used when testing locally your lambda function running:

sam local invoke MyLambdaFunction --env-vars vars.json

vars.json contains the environment variables used by Lambda functions. The structure is as follows:

{
  "LambdaFunctionName1": {
    "VariableName1": "VariableValue1",
    "VariableName2": "VariableValue2",
    ...
  },
  "LambdaFunctionName2": {
    "VariableName1": "VariableValue1",
    "VariableName2": "VariableValue2",
    ...
  },
  ...
}

Installation

Clone the repository to your local machine:

git clone https://github.com/valeriosalvucci/samvars.git

Ensure that

1. Your AWS CLI is configured with the necessary credentials
2. The cloludformation is deployed. samvars gets the parameter value from the deployed cloudformation.

How to use

Python version

Requirements

• Python 3.x
• AWS CLI configured with the necessary credentials
• boto3, toml

Install the required dependencies:

pip install -r requirements.txt

sam-app$ python samvars.py [ --stack-name YourCloudFormationStackName ]

Bash version

Run the script by executing the following command:

sam-app$ sh samvars.sh [ --stack-name YourCloudFormationStackName ]

If the --stack-name parameter is omitted, the script will attempt to read the CloudFormation stack name from samconfig.toml. If samconfig.toml file is not present or does not contain the necessary information, the script will prompt you to enter the CloudFormation stack name manually.