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<time class="post-full-meta-date" datetime="25 July 2017">25 July 2017</time>
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<a href='/tag/aws/'>AWS</a>,
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<h1 class="post-full-title">AWS - Creating my first lambda function</h1>
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<p>Since creating my AWS account a few days ago i have been dying to try out there lambda functions and thought I should create a very simple rest endpoint that will return a lorem lipsum message.</p>
<h2 id="creating-the-function">Creating the function</h2>
<p>To get started I created a very basic index.js file in a new project with a function handler that will be called by aws.</p>
<p><img src="assets/posts/2018-07-25-aws-first-lambda/first.jpg" alt="" /></p>
<p>To keep it simple I used the lorem-ipsum node module available <a href="https://www.npmjs.com/package/lorem-ipsum">here</a> which i pulled down using a package.json file and npm</p>
<p><img src="assets/posts/2018-07-25-aws-first-lambda/second.jpg" alt="" /></p>
<p>I then created a zip folder containing the index.js file and also its dependencies in the node_modules subfolder.</p>
<p>I did run into an issue when zipping these folders where it created a folder wrapping these files in the artifact and as such when uploading and testing in AWS I received errors saying the handler does not exist.</p>
<h2 id="mapping-the-lambda-function">Mapping the lambda function</h2>
<p>Now that I had created the artifact it was time to login to the AWS console and go to the lambda <a href="https://console.aws.amazon.com/lambda/home?#/create/configure-function">dashboard</a> to create the lambda and map it to the function that I just created.</p>
<p>Below is the configurations I used when configuring the new lambda</p>
<p><img src="assets/posts/2018-07-25-aws-first-lambda/third.jpg" alt="" /></p>
<p>Once done you should be able to test it out and if all works out well see the response :D</p>
<p><img src="assets/posts/2018-07-25-aws-first-lambda/fourth.jpg" alt="" /></p>
<h2 id="creating-the-gateway">Creating the gateway</h2>
<p>Now that I had a function running I wanted to be able to trigger it and get the response using a rest call. This was setup by using the AWS <a href="https://console.aws.amazon.com/apigateway/home">gateway</a>.</p>
<p>First up I created an api and then created a get method to the lambda created above</p>
<p><img src="assets/posts/2018-07-25-aws-first-lambda/fifth.jpg" alt="" /></p>
<p>Once the method is created I tested it out within the gateway and all looks good</p>
<p><img src="assets/posts/2018-07-25-aws-first-lambda/six.jpg" alt="" /></p>
<p>The final step is to deploy the gateway API. At first I missed this step and was stuck wondering why I was receiving error’s when trying to hit the same endpoint that was displayed when testing.</p>
<p><img src="assets/posts/2018-07-25-aws-first-lambda/7.jpg" alt="" /></p>
<p>Once done I was able to successfully hit the endpoint using postman and see the generated Lipsum text.</p>
<p>While I used the AWS console to manually configure the different components since it was my first time. Next time I would use their aws-cli and cloudformation to try and do it all automatically enabling quicker changes and updates to the function.</p>
<p>The code can be found <a href="https://github.com/headly48/blog-samples/tree/master/lorem-lipsum-lambda">here</a></p>
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<li><a href="/aws-serverless-crud">Creating a CRUD API with AWS lambda and dynamoDB</a></li>
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<h2 class="post-card-title">Serverless - Making lambda deployments easy</h2>
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<p>In my last post I worked on my first lambda function and went through the process of manually setting up the function, gateway and roles. While this works it does slow down development</p>
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