Delayware

I created a resiliency tool that helps applications tolerate random instance failures within Azure.

Why?

An Azure Website has limited tools for testing resiliency, so I created a tool to allow any website to be taken offline with the click of a button. Simply put, this is my attempt at creating the SimianArmy for Azure.

But what is it?

Delayware is a middleware that introduces a random delay into any request or take down a server for a limited time. It listens for a X-POISON header in an request. This header will contain a JWT encoded message to either delay or take down a service.

How do I use it?

Middleware Setup

public static class WebApiConfig {

  public static void Register(HttpConfiguration config) {

    string secret = "SHHH_SECRET";
    config.MessageHandlers.Add(new PoisonHandler(new DefaultPoisonStrategy(secret)));

  }
}

Create JWT payload

Create JWT @ https://jwt.io/

Poison pill payload

Example to delay the request into service randomly from 500ms to 1000 ms

{
  "from" : 500,
  "to" : 1000,
  "action" : "single",
  "type" : "delay"
}

Example to delay any requests into service randomly from 500ms to 1000 ms for the next 30 secs

{
  "from" : 500,
  "to" : 1000,
  "duration": 30,
  "action" : "timed",
  "type" : "delay"
}

Example to return 500 status code in the request

{
  "code" : 500,
  "action" : "single",
  "type" : "status"
}

Example to return 500 for any requests into service randomly for the next 30 secs

{
  "code" : 500,
  "duration": 30,
  "action" : "timed",
  "type" : "status"
}

Encoded JWT with secret SHHH_SECRET eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmcm9tIjo1MDAsInRvIjoxMDAwLCJhY3Rpb24iOiJzaW5nbGUiLCJ0eXBlIjoiZGVsYXkifQ.qklMQ8H7kJhFfNxpAGTACoBs_7XdMytgg5DPYNpXEPE

Send request to service

curl --header "X-POISON: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmcm9tIjo1MDAsInRvIjoxMDAwLCJhY3Rpb24iOiJzaW5nbGUiLCJ0eXBlIjoiZGVsYXkifQ.qklMQ8H7kJhFfNxpAGTACoBs_7XdMytgg5DPYNpXEPE" www.myservice.com

Demo @ https://youtu.be/d82SSmGBsgo