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Example code of happyr/bref-hook-handler

Informations about the package bref-hook-handler

Bref Hook Handler

Latest Version Total Downloads

This small library helps you to make sure the new version of your lambda application is actually working before you directing traffic it. It makes it simple to run a "PreTrafficHook".

Install

We also need serverless-plugin-canary-deployments from davidgf:

Configure

The idea is to create a new lambda function that can verify that everything is working. When we are sure all things are green, we will signal CodeDeploy to allow real traffic.

Example serverless.yml

Example prehook.php

The prehook script is where you start your application kernel, test writing to the database, dispatch a message on the queue etc etc. If you use the HookHandler it will automatically communicate back to CodeDeploy.

One can of course add as much or little logic as one need.

Making HTTP requests

In the example above we are making a HTTP request to our homepage. We cannot use API Gateway because it does not route traffic to the new Lambda version. So we invoke the lambda version directly with parameters that look like it comes from ApiGateway. The ApiGatewayFaker helps us with that.

This is the only reason why we need to configure lambda:InvokeFunction in the IAM Role.

Note

If the prehook.php does not make a request to CodeDeploy then the deployment will hey stuck at "Checking Stack update progress". This is a good thing. This ensures that the prehook script always reports "Succeeded".

Check the CloudWatch logs if this happens.

Cool, lets to canary deployments!

It is tempting to change the deploymentSettings.type to something else but "AllAtOnce" to expose your new version to 10% of the requests first... But it might not be optimal. Consider reading this article first: https://lumigo.io/blog/canary-deployment-for-aws-lambda/

All versions of bref-hook-handler with dependencies

PHP Build Version
Package Version
Requires php Version >=7.3
ext-json Version *
async-aws/code-deploy Version ^1.0
async-aws/lambda Version ^1.0
bref/bref Version ^0.5.20 || ^1.0
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