https://github.com/tmclaugh/aws-cfn-lambda-updater

AWS Lambda function to update Lambda functions via CloudFormation.
https://github.com/tmclaugh/aws-cfn-lambda-updater

Last synced: about 1 month ago
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AWS Lambda function to update Lambda functions via CloudFormation.

• Host: GitHub
• URL: https://github.com/tmclaugh/aws-cfn-lambda-updater
• Owner: tmclaugh
• Created: 2017-06-19T14:19:20.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2017-06-27T16:19:21.000Z (over 7 years ago)
• Last Synced: 2024-10-02T09:41:24.061Z (about 2 months ago)
• Language: Python
• Size: 8.79 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# aws-cfn-lambda-updater [![Build Status](https://travis-ci.org/tmclaugh/aws-cfn-lambda-updater.svg?branch=master)](https://travis-ci.org/tmclaugh/aws-cfn-lambda-updater)

Lambda function to update other Lambda function when called via CloudFormation.

This repository contains two Lambda functions along with CloudFormation templates for each function.

* __aws-cfn-lambda-updater__: Function for updating an AWS Lambda function when triggered via AWS CLoudFormation.

  * _deployable code_: https://s3.amazonaws.com/straycat-dhs-org-straycat-lambda-deploys/aws-cfn-lambda-updater.zip

  * _CloudFormation template_: https://s3.amazonaws.com/straycat-dhs-org-straycat-lambda-deploys/aws-cfn-lambda-updater.json

* __aws-cfn-lambda-updater-example-lambda__: Simple “Hello World” function to demonstrate using aws-cfn-lambda-updater.

  * _deployable code_: https://s3.amazonaws.com/straycat-dhs-org-straycat-lambda-deploys/aws-cfn-lambda-updater-example-lambda.zip

  * _CloudFormation template_: https://s3.amazonaws.com/straycat-dhs-org-straycat-lambda-deploys/aws-cfn-lambda-updater-example-lambda.json

## Deployment

Deploying Both stacks can be done by clicking on "Launch Stack" below.

* __aws-cfn-lambda-updater__: [![Launch CloudFormation

Stack](https://s3.amazonaws.com/cloudformation-examples/cloudformation-launch-stack.png)](https://console.aws.amazon.com/cloudformation/home?region=us-east-1#/stacks/new?stackName=aws-cfn-lambda-updater&templateURL=https://s3.amazonaws.com/straycat-dhs-org-straycat-lambda-deploys/aws-cfn-lambda-updater.json)

* __aws-cfn-lambda-updater-example-lambda__: [![Launch CloudFormation

Stack](https://s3.amazonaws.com/cloudformation-examples/cloudformation-launch-stack.png)](https://console.aws.amazon.com/cloudformation/home?region=us-east-1#/stacks/new?stackName=aws-cfn-lambda-updater-example-lambda&templateURL=https://s3.amazonaws.com/straycat-dhs-org-straycat-lambda-deploys/aws-cfn-lambda-updater-example-lambda.json)

## Usage

To use _aws-cfn-lambda-updater_ to update another Lambda function that is deployed via CloudFormation, add a resource similar to the following to your CloudFormation template.  You’ll need to add parameters for _LambdaName_ and _S3Bucket_.

```json

"LambdaInvokeUpdater": {

  "Type": "Custom::LambdaUpdaterInvoke",

  "Properties": {

    "ServiceToken":{

      "Fn::ImportValue": {

        "Fn::Sub": "aws-cfn-lambda-updater-LambdaFunctionArn"

      }

    },

    "FunctionName": {

      "Ref": "LambdaName"

    },

    "S3Bucket": {

      "Ref": "S3Bucket"

    },

    "S3Key": {

      "Fn::Sub": "${LambdaName}.zip"

    }

  }

}

```

To ensure that the _LambdaInvokeUpdater_ resource requires an update on each version, add a command like the following to your build process.

```

$ python -c "import json, sys; cfn=json.load(sys.stdin); cfn['Resources']['LambdaInvokeUpdater']['Properties']['CodeSha256'] = '$(openssl dgst -binary -sha256 dist/aws-cfn-lambda-updater.zip | openssl base64)'; json.dump(cfn, sys.stdout, indent=2)" < dist/aws-cfn-lambda-updater-example-lambda.json > dist/aws-cfn-lambda-updater-example-lambda.json.new; mv dist/aws-cfn-lambda-updater-example-lambda.json{.new,}

```

See this repository’s _.travis.yml_ for an example in practice.