Sidecar — Deploy and execute AWS Lambda functions from your Laravel application.

Deploying Functions

After you have created your function class and all the handler code, you'll need to deploy it to AWS Lambda.

The simplest way to deploy and activate all of your configured functions is to run the following command

1php artisan sidecar:deploy --activate

When you run that, you'll see an output log similar to the one below:

1[Sidecar] ---------
2[Sidecar] Deploying App\Sidecar\OgImage to Lambda. (Runtime nodejs12.x)
3[Sidecar] Creating new lambda function.
4[Sidecar] Packaging function code.
5[Sidecar] Creating a new zip file.
6[Sidecar] Zip file created at s3://sidecar-us-east-2-XXX/sidecar/
7[Sidecar] ---------
8[Sidecar] Activating the latest version (1) of SC-Laravel-local-Sidecar-OgImage.

The deployment process consists of

  • zipping the handler code
  • uploading the zip file to S3
  • creating the Lambda function if it doesn't exist
  • updating the function if it already exists
  • (optionally) activating the newest version of the function

Deploying vs. Activating

There are two required steps in order to make your functions live and usable.

  • The first is to deploy the handler code and create the Lambda function.
  • The second step is to activate that new version of your Lambda function.

Because your handler code may require you to npm install, bundle install, or something similar, you may be building and deploying your handler code in CI or from your local computer.

Once that handler code is all bundled and deployed to Lambda, there may be a secondary step required to deploy your main application.

During this secondary step, your Lambda functions are going to be updated but your application code will not be, which could lead to errors for your users.

That's why we have separated the two steps into Deploy and Activate.

To deploy but not activate your code, you would run the deploy command without the --activate flag.

1php artisan sidecar:deploy

Then, when it is time to flip the switch over to your new application code, you can call sidecar:activate to activate the newest version of all your Sidecar functions on Lambda.

1php artisan sidecar:activate

A Vapor Example

Laravel Vapor provides you with two hooks during its deploy process. The first is the build hook, where you can install all of your dependencies, run any scripts, etc, on the machine that is running the deployment.

The second step is the deploy hook, that is run in the Vapor environment.

You might set your vapor.yml up to use those hooks to deploy and activate your functions:

1id: XXX
2name: hammerstonedev
4 production:
5 domain:
6 memory: 512
7 cli-memory: 512
8 build:
9 - 'php artisan sidecar:deploy'
10 deploy:
11 - 'php artisan sidecar:activate'

Your functions would be built and deployed on whatever machine is handling the Vapor deploy process, and then would be activated as Vapor activates your newest application code.

Faking the Environment

Sidecar names your function based on environment, to prevent collisions between local, staging, production, etc. This could pose a problem if you are deploying your production functions from your build or CI server.

If you need to deploy an environment other than the one you are in, you can override the environment from the config by passing an --env flag to the Deploy and Activate commands.

1php artisan sidecar:deploy --env=production
2php artisan sidecar:activate --env=production

Reusing Package Files

If you're deploying your Sidecar functions every time you deploy your app, you will likely be deploying functions that have not changed at all.

In the case where no code has changed, Sidecar will not upload a new zip file to your bucket, but will reuse the old one.

In the event that neither the code nor function configuration have changed, Sidecar won't touch the Lambda function at all!

You will see output similar to the following:

1[Sidecar] ---------
2[Sidecar] Deploying App\Sidecar\OgImage to Lambda. (Runtime nodejs12.x.)
3[Sidecar] Function already exists, potentially updating code and configuration.
4[Sidecar] Packaging function code.
5[Sidecar] Package unchanged, reusing previous code package at s3://sidecar-us-east-2-XXX/sidecar/
6[Sidecar] Function code and configuration are unchanged! Not updating anything.
7[Sidecar] ---------
8[Sidecar] Activating the latest version (1) of SC-Laravel-local-Sidecar-OgImage.