AWS GitLab Connector

AWS CodeBuild/CodePipeline does not nativly support GitLab Repositories. You can only build repositories from CodeCommit, GitHub and Zip-Files stored in Amazon S3. This is a sample template for a GitLab connector for AWS CodeBuild. To use it you need to set up the Lambda endpoint as described below, add it as webhook for push-events to your GitLab repository and change your CodeBuild or CodePipeline configuration so that the destination S3-Bucket is your source of code.

.
├── Makefile                    <-- Make to automate build
├── README.md                   <-- This instructions file
├── gitlab-connector            <-- Source code for a lambda function
│   ├── main.go                 <-- Lambda function code
│   ├── main_test.go            <-- Test for main function
│   ├── GitCloneAndZip.go       <-- Routine for cloning and zipping repository 
│   ├── GitCloneAndZip_test.go  <-- Test for cloning and zipping routine
|   ├── Zipper.go               <-- Routine for compressing bytes into a Zip-archive 
|   └── Zipper_test.go          <-- Test for compressing routine
├── template.yaml               <-- SAM Template
└── .gitignore                  <-- Files to ignore by git

Status

Requirements

• AWS CLI already configured with Administrator permission
• Golang
• Makefile

Architecture

Setup process

Installing dependencies

You can use make to install all go dependencies or run the GO command directly.

make deps
// or
go get -u ./gitlab-connector/...

Building

Golang is a staticly compiled language, meaning that in order to run it you have to build the executeable target.

You can issue the following command in a shell to build it:

make build
// or 
GOOS=linux GOARCH=amd64 go build -o gitlab-connector/gitlab-connector ./gitlab-connector

NOTE: If you're not building the function on a Linux machine, you will need to specify the GOOS and GOARCH environment variables, this allows Golang to build your function for another system architecture and ensure compatability.

Local development

Invoking function locally through local API Gateway

sam local start-api

If the previous command ran successfully you should now be able to hit the following local endpoint to invoke your function http://localhost:3000/gitlab

SAM CLI is used to emulate both Lambda and API Gateway locally and uses the template.yaml to understand how to bootstrap this environment (runtime, where the source code is, etc.) - The following excerpt is what the CLI will read in order to initialize an API and its routes:

...
Events:
    GitLab:
        Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
        Properties:
            Path: /gitlab
            Method: post

Packaging and deployment

To deploy the connector you can simply use the Docker deployment.

First you need to build the image with some parameters you should define previously. Replace

• <Target Bucket> with the S3 bucket where the CloudFormation template shall be stored.
• <Lambda Bucket> with the S3 bucket where the Lambda deployment package shall be stored.
• <AWS Access Key> with your AWS access key (e.g. AKIAXXXXXXXXXXXXXXXQ)
• <AWS Secret Access Key> with your AWS secret access key (e.g. NMAXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXR)
• <Region> with the region you want to deploy the stack in

TARGET_BUCKET=<Target Bucket>
LAMBDA_BUCKET=<Lambda Bucket>
AWS_ACCESS_KEY=<AWS Access Key>
AWS_SECRET_ACCESS_KEY=<AWS Secret Access Key>
REGION=<Region>

docker build \
    --build-arg target_bucket=$TARGET_BUCKET \
    --build-arg lambda_bucket=$LAMBDA_BUCKET \
    --build-arg aws_access_key=$AWS_ACCESS_KEY \
    --build-arg aws_secret_key=$AWS_SECRET_ACCESS_KEY \ 
    --build-arg region=$REGION \
    -t hendricjabs/aws-gitlab-connector .

Now you can run the deployment process:

docker run hendricjabs/aws-gitlab-connector

After deployment is complete you can run the following command to retrieve the API Gateway Endpoint URL:

aws cloudformation describe-stacks \
    --stack-name gitlab-connector \
    --query 'Stacks[].Outputs'

Testing

We use testing package that is built-in in Golang and you can simply run the following command to run our tests:

make test
// or
go test -v ./gitlab-connector/

Appendix

Golang installation

Please ensure Go 1.x (where 'x' is the latest version) is installed as per the instructions on the official golang website: https://golang.org/doc/install

Bringing to the next level

Here are a few ideas that you can use to get more acquainted as to how this overall process works:

• Create an additional API resource for Atlassian BitBucket Now supported by AWS CodeBuild.

Next, you can use the following resources to know more about beyond hello world samples and how others structure their Serverless applications:

• AWS Serverless Application Repository

Contribute

I'm glad for every feedback, improvement, recommendation, pull-request, bug report and advise.