chaos-middleware

Express middleware for chaos testing

Usage

const chaos = require('chaos-middleware')
const express = require('express')
const app = express()
 
const options = {
  probability: 0.5,
  rules: [
    { event: 'httpStatus', params: 500 }
  ]
}
 
app.use(chaos(options))

chaos(options)

create a chaos middleware instance.

• options Object
  • probability Number (default = 0.1) - probability that is chaos happens. (0.0 - 1.0)
  • rules Array - rules for chaos.

Rule

• event String - event name. (eg. httpStatus)
• params Any - parameter for the event.
• weight Number ( defualt = 1) - weight for select this rule among the rules.

Events

An event is a function exposed in chaos.events.

events.httpStatus(status)

Return response with specific status code.

• status Number - status code.

events.delay(amount)

Return normal response with some delay.

• amount Number - millseconds to delay.

events.close()

Close connections.

events.exit(exitCode = 1)

Exit node process.

• exitCode Number - exit code.

events.kill(signal = "SIGHUP")

Send the signal to self process.

• signal Number|String - the signal name or number.

events.throwError(err)

Throw err.

• err Any - An error to throw.

events.reject(err)

Rise unhandledRejection.

• err Any - An error to reject promises.