Serverless Golang API with AWS Lambda

AWS has announced few days ago, Go as supported language for AWS Lambda. So, I got my hand dirty and I made a Serverless Golang Lambda Function to discover new Movies by genres, I went even further and created a Frontend in top of my API with Angular 5.

Note: The full source code for this application can be found on GitHub 

To get started, install the dependencies below:

Create a main.go file with the following code:

The handler function takes as a parameter the movie genre ID then query the TMDb API  – Awesome free API for Movies and TV Shows – to get list of movies. I registred the handler using the lambda.Start() method.

To test our handler before deploying it, we can create a basic Unit Test:

Issue the following command to run the test:

Next, build an executable binary for Linux:

Zip it up into a deployment package:

Use the AWS CLI to create a new Lambda Function:

Note: substitute role flag with your own IAM role.

Sign in to the AWS Management Console, and navigate to Lambda Dashboard, you should see your lambda function has been created:

Set TMDb API KEY (Sign up for an account) as environment variable:

Create a new test event:

 Upon successful execution, view results in the console:

To provide the HTTPS frontend for our API, let’s add API Gateway as a trigger to the function:

Deployment:

Now, if you point your favorite browser to the Invoke URL:

Congratulations   you have created your first Lambda function in Go.

Let’s build a quick UI in top of the API with Angular 5. Create an Angular project from scratch using Angular CLI. Then, generate a new Service to calls the API Gateway URL:

In the main component iterate over the API response:

Note: the full code is in GitHub.

Generate production grade artifacts:

The build artifacts will be stored in the dist/ directory

Next, create an S3 bucket with AWS CLI:

Upload the build artifacts to the bucket:

Finally, turns website hosting on for your bucket:

If you point your browser to the S3 Bucket URL, you should be happy:

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