How to setup automated deployment from CodeCommit to a Lambda Function? - amazon-web-services

Question

I'm trying to "deploy" the content of a CodeCommit repository to a Lambda function (not an application).
In this particular case it's a simple copy/paste from source to destination.
I'm struggling to find a solution that doesn't involve setting up another Lambda function. From what I understand, there is a solution using CodeBuild and CloudFormation.
Does anyone have a solution for this? Alternatively, can you point to any good documentation?
P.S:
I found this question that seems to answer my question but the links in the relevant answer are outdated.

Answer 1

You can build a Code Commit Pipeline with a CodeBuild Job where you CodeCommit repository has a SAM Template like below and you run
sam build && sam deploy
From the codebuild job.
AWSTemplateFormatVersion : '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: A sample SAM template for deploying Lambda functions.
Resources:
# Details about the myDateTimeFunction Lambda function
myDateTimeFunction:
Type: AWS::Serverless::Function
Properties:
Handler: myDateTimeFunction.handler
Runtime: nodejs12.x
# Creates an alias named "live" for the function, and automatically publishes when you update the function.
AutoPublishAlias: live
DeploymentPreference:
# Specifies the deployment configuration
Type: Linear10PercentEvery2Minutes
This documentation page describes the same CodeCommit Rolling deployments for Lambda functions

Answer 2

This is the solution that worked for me.
I setup a pipeline with CodeCommit as source and a Build Phase (no Deploy Phase).
The Build phase reads a buildspec.yml file which itself reads SAM template called template.yml. The SAM stack is created via CloudFormation.
I created an s3 bucket to hold the build artifacts.
Here is the sample buildspec.yml file:
version: 0.2
phases:
install:
commands:
- echo Nothing to do in the install phase...
pre_build:
commands:
- echo Nothing to do in the pre_build phase...
build:
commands:
- aws cloudformation package --template-file template.yml
--s3-bucket <bucketname>
--output-template-file newtemplate.yml
- aws cloudformation deploy --stack-name <stackname>
--capabilities CAPABILITY_IAM
--template-file newtemplate.yml
--role-arn arn:aws:iam::<account number>:role/CloudFormationServiceRole
post_build:
commands:
- echo Build completed
Here is the sample template.yml file :
AWSTemplateFormatVersion : '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: CloudFormation Stack for the lambda function
Resources:
# Details about the Lambda function
<StackName>:
Type: AWS::Serverless::Function
Properties:
Handler: index.handler
Runtime: nodejs12.x
CodeUri: src/
# Creates an alias named "live" for the function, and automatically publishes when you update the function.
AutoPublishAlias: live
DeploymentPreference:
# Specifies the deployment configuration
Type: AllAtOnce
The file structure is :
.
├── src/
│ ├── node_modules/
│ └── index.js
├── builspec.yml
└── template.yml
Make sure you set the correct IAM policies for the CloudFormation and CodeBuild IAMs.