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# OpenDC Frontend
[](https://opensource.org/licenses/MIT)
The user-facing component of the OpenDC stack, allowing users to build and interact with their own (virtual) datacenters. Built in *React.js* and *Redux*, with the help of `create-react-app`.
## Architecture
The codebase follows a standard React.js structure, with static assets being contained in the `public` folder, while dynamic components and their styles are contained in `src`. The app uses client-side routing (with `react-router`), meaning that the only HTML file needed to be served is a `index.html` file.
### Pages
All pages are represented by a component in the `src/pages` directory. There are components for the following pages:
**Home.js** - Entry page (`/`)
**Simulations.js** - Overview of simulations of the user (`/simulations`)
**App.js** - Main application, with datacenter construction and simulation UI (`/simulations/:simulationId` and `/simulations/:simulationId/experiments/:experimentId`)
**Experiments.js** - Overview of experiments of the current simulation (`/simulations/:simulationId/experiments`)
**Profile.js** - Profile of the current user (`/profile`)
**NotFound.js** - 404 page to appear when the route is invalid (`/*`)
### Components & Containers
The building blocks of the UI are divided into so-called *components* and *containers* (as [encouraged](https://medium.com/@dan_abramov/smart-and-dumb-components-7ca2f9a7c7d0) by the author of Redux). *Components* are considered 'pure', rendered as a function of input properties. *Containers*, on the other hand, are wrappers around *components*, injecting state through the properties of the components they wrap.
### State Management
Almost all state is kept in a central Redux store. State is kept there in an immutable form, only to be modified through actions being dispatched. These actions are contained in the `src/actions` folder, and the reducers (managing how state is updated according to dispatched actions) are located in `src/reducers`. If you're not familiar with the Redux approach to state management, have a look at [their official documentation](http://redux.js.org/).
### API Interaction
The web-app needs to pull data in from the API of a backend running on a server. The functions that call routes are located in `src/api`. The actual logic responsible for calling these functions is contained in `src/sagas`. These API fetch procedures are written with the help of `redux-saga`. Learn more about this way of getting API data in Redux on [their official documentation](https://redux-saga.js.org/).
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