Image Builder Frontend

Principles

1. We want to use the latest and greatest web technologies.
2. We want to expose all the options and customizations possible, even if not all are visible by default.
3. The default path should be ‘short(est)’ clickpath, which should be determined in a data-driven way.
4. This is an Insights application, so it abides by some rules and standards of Insights.

Table of Contents

1. How to build and run image-builder-frontend
   1. Frontend Development
      1. API
      2. Unleash feature flags
   2. Backend Development
2. File structure
3. Style Guidelines
4. Test Guidelines

How to build and run image-builder-frontend

Frontend Development

To develop the frontend you can use a proxy to run image-builder-frontend locally against the chrome and backend at console.redhat.com.

Working against the production environment is preferred, as any work can be released without worrying if a feature from stage has been released yet.

Nodejs and npm version

Make sure you have npm@10 and node 18+ installed. If you need multiple versions of nodejs check out nvm.

Webpack proxy

1. run npm ci

2. run npm run start, select prod environment and choose beta or stable.

3. redirect prod.foo.redhat.com to localhost, if this has not been done already.

echo "127.0.0.1 prod.foo.redhat.com" >> /etc/hosts

4. open browser at https://prod.foo.redhat.com:1337/beta/insights/image-builder

Webpack proxy (staging) -- Runs with image-builder's stage deployment

1. run npm ci

2. run npm run start, select stage environment and choose beta or stable.

3. redirect stage.foo.redhat.com to localhost, if this has not been done already.

echo "127.0.0.1 stage.foo.redhat.com" >> /etc/hosts

4. open browser at https://stage.foo.redhat.com:1337/beta/insights/image-builder

Insights proxy (deprecated)

1. Clone the insights proxy: https://github.com/RedHatInsights/insights-proxy

2. Setting up the proxy

   Choose a runner (podman or docker), and point the SPANDX_CONFIG variable to profile/local-frontend.js included in image-builder-frontend.

       sudo insights-proxy/scripts/patch-etc-hosts.sh
       export RUNNER="podman"
       export SPANDX_CONFIG=$PATH_TO/image-builder-frontend/profiles/local-frontend.js
       sudo -E insights-proxy/scripts/run.sh
   

3. Starting up image-builder-frontend

   In the image-builder-frontend checkout directory

       npm install
       npm start
   

The UI should be running on https://prod.foo.redhat.com:1337/beta/insights/image-builder/landing. Note that this requires you to have access to either production or stage (plus VPN and proxy config) of insights.

API endpoints

API slice definitions are programmatically generated using the @rtk-query/codegen-openapi package.

OpenAPI schema for the endpoints are stored in /api/schema. Their corresponding configuration files are stored in /api/config. Each endpoint has a corresponding empty API slice and generated API slice which are stored in /src/store.

Add a new API

For a hypothetical API called foobar

1. Download the foobar API OpenAPI json or yaml representation under api/schema/foobar.json

2. Create a new "empty" API file under src/store/emptyFoobarApi.ts that has following content:

import { createApi, fetchBaseQuery } from '@reduxjs/toolkit/query/react';

import { FOOBAR_API } from '../constants';

// initialize an empty api service that we'll inject endpoints into later as needed
export const emptyFoobarApi = createApi({
  reducerPath: 'foobarApi',
  baseQuery: fetchBaseQuery({ baseUrl: window.location.origin + FOO_BAR }),
  endpoints: () => ({}),
});

3. Declare new constant FOOBAR_API with the API url in src/constants.ts

export const FOOBAR_API = 'api/foobar/v1'

4. Create the config file for code generation in api/config/foobar.ts containing:

import type { ConfigFile } from '@rtk-query/codegen-openapi';

const config: ConfigFile = {
  schemaFile: '../schema/foobar.json',
  apiFile: '../../src/store/emptyFoobarApi.ts',
  apiImport: 'emptyEdgeApi',
  outputFile: '../../src/store/foobarApi.ts',
  exportName: 'foobarApi',
  hooks: true,
  filterEndpoints: ['getFoo', 'getBar', 'getFoobar'],
};

5. Update the api.sh script by adding a new line for npx to generate the code:

npx @rtk-query/codegen-openapi ./api/config/foobar.ts &

6. Update the .eslintignore file by adding a new line for the generated code:

foobarApi.ts

7. run api generation

npm run api

And voilà!

Add a new endpoint

To add a new endpoint, simply update the api/config/foobar.ts file with new endpoints in the filterEndpoints table.

Unleash feature flags

Your user needs to have the corresponding rights, do the same as this MR in internal gitlab https://gitlab.cee.redhat.com/service/app-interface/-/merge_requests/79225 you can ask on the slack channel https://redhat-internal.slack.com/archives/C023YSA47A4 for a merge if your MR stays unchecked for a little while.

Then connect to the following platforms:

• https://insights-stage.unleash.devshift.net/ for stage
• https://insights.unleash.devshift.net prod

Once you have a toggle to work with, on the frontend code there's just need to import the useFlag hook and to use it. You can get some inspiration from existing flags:

c84b493eba/src/Components/ImagesTable/ImageLink.js (L99)

Mocking flags for tests

Flags can be mocked for the unit tests to access some feature. Checkout: 9a464e416b/src/test/Components/CreateImageWizard/CreateImageWizard.test.tsx (L49)

If the two possible code path accessible via the toggles are defined in the code base, then it's good practice to test the two of them. If not, only test what's actually owned by the frontend project.

Cleaning the flags

Unleash toggles are expected to live for a limited amount of time, documentation specify 40 days for a release, we should keep that in mind for each toggle we're planning on using.

Backend Development

To develop both the frontend and the backend you can again use the proxy to run both the frontend and backend locally against the chrome at cloud.redhat.com. For instructions see the osbuild-getting-started project.

File Structure

Quick Reference

Directory	Description
/api	API schema and config files
/config	webpack configuration
/devel	tools for local development
/src	source code
/src/Components	source code split by individual components
/src/test	test utilities
/src/test/mocks	mock handlers and server config for MSW
/src/store	Redux store

Style Guidelines

This project uses eslint's recommended styling guidelines. These rules can be found here: https://eslint.org/docs/rules/

To run the linter, use:

npm run lint

Any errors that can be fixed automatically, can be corrected by running:

npm run lint --fix

All the linting rules and configuration of eslint can be found in .eslintrc.yml.

Additional eslint rules

There are also additional rules added to enforce code style. Those being:

• import/order -> enforces the order in import statements and separates them into groups based on their type
• prefer-const -> enforces use of const declaration for variables that are never reassigned
• no-console -> throws an error for any calls of console methods leftover after debugging

Test Guidelines

This project is tested using the Vitest framework, React Testing Library, and the Mock Service Worker library.

All UI contributions must also include a new test or update an existing test in order to maintain code coverage.

Running the tests

To run the unit tests, the linter, and the code coverage check run:

npm run test

These tests will also be run in our CI when a PR is opened.

Note that testing-library DOM printout is currently disabled for all tests by the following configuration in src/test/setup.ts:

configure({
  getElementError: (message: string) => {
    const error = new Error(message);
    error.name = 'TestingLibraryElementError';
    error.stack = '';
    return error;
  },
});

If you'd like to see the stack printed out you can either temporarily disable the configuration or generate a Testing Playground link by adding screen.logTestingPlaygroundURL() to your test.

Using MSW data in development - CURRENTLY NOT WORKING

If you want to develop in environment with mocked data, run the command npm run stage-beta:msw.

Enabling MSW

In a case you're seeing Error: [MSW] Failed to register the Service Worker in console, you might also need to configure SSL certification on your computer.

In order to do this install mkcert

After the installation, go to the /node_modules/.cache/webpack-dev-server folder and run following commands:

1. mkcert -install  to create a new certificate authority on your machine
2. mkcert prod.foo.redhat.com  to create the actual signed certificate

Mac Configuration

Follow these steps to find and paste the certification file into the 'Keychain Access' application:

1. Open the 'Keychain Access' application.

2. Select 'login' on the left side.

3. Navigate to the 'Certificates' tab.

4. Drag the certification file (located at /image-builder-frontend/node_modules/.cache/webpack-dev-server/server.pem) to the certification list.

5. Double-click on the added certificate (localhost certificate) to open the localhost window.

6. Open the 'Trust' dropdown menu.

7. Set all options to 'Always Trust'.

8. Close the localhost screen.

9. Run npm run stage-beta:msw and open the Firefox browser to verify that it is working as expected.