âī¸Technical stack
Technologies at play in Onyxia-web
Technologies at play in Onyxia-web
To find your way in Onyxia, the best approach is to start by getting a surface-level understanding of the libraries that are leveraged in the project.
Modules marked by đ are our own.
We are fully committed on keeping everything type safe. If you are a seasoned developer but not fully comfortable with TypeScript yet a good way to get you quickly up to speed is to go through the What's new section of the official website.
You can skip anything related to class we don't do OOP in the project.
We also heavily rely on tsafe. It's a collection of utilities that help write cleaner TypeScript code. It is crutial to understand at least assert, id, Equals and symToStr to be able to contribute on the codebase.
We try, whenever we see an opportunity for it, to publish as standalone NPM module chunks of the code we write for Onyxia-web. It help keep the complexity in check. We use TS-CI as a starter for everything we publish on NPM.
Anything contained in the src/ui directory.
The UI toolkit used in the project, you can find the setup of onyxia-UI in onyxia-web here: src/ui/theme.tsx.
Onyxia-UI is fully compatible with MUI.
Onyxia-UI offers a library of reusable components but you can also use MUI components in the project, their aspect will automatically be adapted to blend in with the theme.
We currently offers builtin support for four color palettes:
Ultraviolet: datalab.sspcloud.fr?THEME_ID=ultraviolet
Verdant: datalab.sspcloud?THEME_ID=verdant
Onyxia (default): datalab.sspcloud.fr?THEME_ID=onyxia
You can also provide your own palette.
The fonts are loaded in the public/index.html. It's important to keep it that way for Keycloakify.
To release a new version of Onyxia-UI. You just need to bump the package.json's version and push. The CI will automate publish a new version on NPM.
If you want to test some changes made to onyxia-ui in onyxia-web before releasing a new version of onyxia-ui to NPM you can link locally onyxia-ui in onyxia-web.
Now you can make changes in ~/github/onyxia/ui/and see the live updates.
If you want to install/update some dependencies, you must remove the node_modules, do you updates, then link again.
The library we use for styling.
Rules of thumbs when it comes to styling:
Every component should accept an optional classNameprop it should always overwrite the internal styles.
A component should not size or position itself. It should always be the responsibility of the parent component to do it. In other words, you should never have height, width, top, left, right, bottom or margin in the root styles of your components.
You should never have a color or a dimension hardcoded elsewhere than in the theme configuration. Use theme.spacing() (ex1, ex2, ex3) and theme.colors.useCases.xxx.
Onyxia is mostly used on desktop computer screens. It's not worth the effort to create a fully flege responsive design for the UI. screen-scaler enables us to design for a sigle canonical screen size. The library take charge of scaling/shrinking the image. depending on the real size of the screen. It also asks to rotate the screen when the app is rendered in protrait mode.
It enables us to test the graphical components in isolation. See sources.
To launch Storybook locally run the following command:
We need to be able to do:
Then, somehow, access OIDC_URL in the code like process.env["OIDC_URL"].
In theory it shouldn't be possible, onyxia-web is an SPA, it is just static JS/CSS/HTML. If we want to bundle values in the code, we should have to recompile. But this is where cra-envs comes into play.
It enables to run onyxia-web again a specific infrastructure while keeping the app docker image generic.
Checkout the helm chart:
All the accepted environment variables are defined here: .env. They are all prefixed with REACT_APP_ to be compatible with create-react-app. Default values are defined in this file.
Only in development (yarn start) .env.local is also loaded and have priority over .env
Then, in the code the variable can be accessed like this.
It's a collection general purpose react hooks. Let's document the few use cases you absolutely need to understand:
For the sake of performance we enforce that every component be wrapped into React.memo(). It makes that a component only re-render if one of their prop has changed.
However if you use inline functions or useCallback as callbacks props your components will re-render every time anyway:
We always use useConstCallback for callback props. And useCallbackFactory for callback prop in lists.
It is very handy to be able to get the height and the width of components dynamically. It prevents from having to hardcode dimension when we donât need to. For that we use useDomRect``
It's a build tool that enables to implement the login and register pages that users see when they are redirected to Keycloak for authentication.
If the app is being run on Keycloak the kcContext isn't undefined and it means shat we should render the login/register pages.
If you want to test, uncomment this line and run yarn start. You can also test the login pages in a local keycloak container by running yarn keycloak. All the instructions will be printed on the console.
The keycloak-theme.jar file is automatically build and uploaded as a GitHub release asset by the CI.
The library we use for routing. It's like react-router but type safe.
For internalization and translation.
We plane to move to Vite when Keycloakify will support it.
The project is a non-ejected create-react-app using typescript template (you can find here the template repo that was used as a base for this project).
We use react-app-rewired instead of the default react-scripts to be able to use custom Webpack plugins without having to eject the App. The custom webpack plugins that we use are defined here /config-overrides.json. Currently we only one we use is circular-dependency-plugins.
Anything contained in the src/core directory.
The framework used to implement strict separation of concern betwen the UI and the Core and high modularity of the code.
EVT is an event management library (like RxJS is).
A lot of the things we do is powered under the hood by EVT. You don't need to know EVT to work on onyxia-web however, in order to demystify the parts of the codes that involve it, here are the key ideas to take away:
If we need to perform particular actions when a value gets changed, we useStatefullEvt.
We use Ctxto detaches event handlers when we no longer need them. (See line 108 on this playground)
In React, we use the useEvt hook to work with DOM events.
