ember-service-worker-request-chaos

Often our applications talk to external APIs. Sometimes our apps talk to external APIs that ~~suck~~ are unreliable. Often, we don't test the failure cases well enough (or at all).

• What does it look like when a request to X service flakes out?
• Where could we add recovery options?

We can answer these questions with Service Workers and not have to spend time setting up a proxy on our local machines to MITM all of our traffic. This addon adds a service worker via ember-service-worker to intercept specified requests and will randomly return error responses in the 5xx range.

Find out how well your application tolerates failure!

Runtime dependencies

• ember-service-worker

Installation

• ember install ember-service-worker - (If you're not already using it)

• ember install ember-service-worker-request-chaos

• Define some patterns to intercept in your ember-cli-build.js

  /* eslint-env node */
  'use strict';
  
  const EmberAddon = require('ember-cli/lib/broccoli/ember-addon');
  
  module.exports = function(defaults) {
    let app = new EmberApp(defaults, {
      'esw-request-chaos': {
        // RegExp patterns specifying which URLs to wreck chaos.
        patterns: [
          'https://scaling.is.difficult/api/(.+)',
        ]
      }
    });
  
    // [...]
  };
  

Installation for development

• git clone <repository-url> this repository
• cd ember-service-worker-request-chaos
• yarn install

Running Tests

• yarn test (Runs ember try:each to test your addon against multiple Ember versions)
• ember test
• ember test --server

TODO

• [ ] Configure to only include in development environment