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README.md

Lab 3: Developing a Lambda function locally

So far, we used the web based editor but that's of course not how larger applications are developed. We want to use a local IDE and then deploy to Lambda. Usually this is even a necessity as much of Node.js power lies in the huge number of npm modules available and they can not be installed to a project via AWS console.

In this lab we will prepare, bundle and upload the same REST API we used on the console before.

Step-by-step Guide

  1. Open Visual Studio Code and this repository.

  2. In the integrated terminal, change to projects/rest-api

  3. While we are at it let's bring in the Dynatrace agent by running npm install --save @dynatrace/oneagent@next.

    By using @next we are making sure that we get the very latest agent version.

  4. The agent npm module contains pre-compiled versions for many platforms and Node.js versions. We should trim it down to what we actually need - and that's Node.js 8.10 on Linux. The npm module comes with a script that does exactly that.

    In the integrated terminal, run npx dt-oneagent-tailor --AwsLambdaV8 to trim the agent down. It should terminate with SUCCEEDED and the overall project size should be around 4 times smaller than before.

  5. To upload the package to AWS, we need to ZIP it first. A common pitfall is to ZIP the whole folder, which creates a nested folder when uploaded to AWS. We have to make sure that the ZIP only contains the files and not the folder they are contained in locally.

    On Mac or Linux

    • use the integrated terminal and run zip -r ../rest-api-deploy.zip .f from the project directory.

    On Windows

    1. open the File Explorer
    2. change into the project directory
    3. select all files
    4. click right
    5. choose Send to and choose Compressed (zipped) folder and enter rest-api-deploy.zip as filename.

  6. Open the AWS console and the previously created HotDayRestMicroservice function and now choose Upload a ZIP File in the Function code section.

  7. Select the deployment ZIP and click Save

  8. Let's use postman to do a quick test to see if everything still works

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