Random & crazy pranks to check your app resiliency

Installation

npm install chaos-monkey

Import and initialize

Require this package at the very beginning of your app, before registering other routes

const ChaosMonkey = require('chaos-monkey');
new ChaosMonkey(app, require('./chaos.config') ).start();

Activate

You may start doing pranks using two methods:

1. Configuration Provide the following config file to the constructor Example:

module.exports = {
  sideMonkeyPort: 3000,
  startMode: "passive", //config, passive (for API calls)
  pranks: [{
      name: "500-error-on-route",
      file: "500-error-on-route",
      active: true,
      properties: {
        urls: ["/api/products", "/anyurl"]

      },
      schedule: {
        type: "immediate-schedule",
        fadeOutInMS: 10000
      }
    },
    {
      name: "process-exit",
      file: "process-exit",
      active: false,
      properties: {
        exitCode: 1
      },
      schedule: {
        type: "one-time-schedule",
        delay: 60000
      }
    },
    {
      name: "uncaught-exception",
      file: "uncaught-exception",
      active: false,
      properties: {
        message: "Uncaught exception was thrown by the chaos monkey"
      },
      schedule: {
        type: "one-time-schedule",
        delay: 9000
      }
    },
    {
      name: "memory-load",
      file: "memory-load",
      active: true,
      properties: {
        maxMemorySizeInMB: 10
      },
      schedule: {
        type: "one-time-schedule",
        delay: 1000,
        fadeOutInMS: 30000
      }
    },
    {
      name: "cpu-load",
      file: "cpu-load",
      active: false,
      properties: {},
      schedule: {
        type: "peaks",
        sleepTimeBetweenPeaksInMS: 3000,
        pickLengthInMS: 10000,
        forHowLong: 8000
      }
    }
  ]
};

2. API calls Perform POST call to ~server/chaos/pranks providing any prank configuration object, for example:

{"name":"uncaught-exception","file":"uncaught-exception","active":true,"properties":{"message":"Uncaught exception was thrown by the chaos monkey"},"schedule":{"type":"one-time-schedule","delay":2000}}