GreenForce

Monorepo for the DataHub and Energy Origin frontends backed by Nx and Angular.

Table of Contents

• General
• Prerequisites
• DataHub
  • Documentation
  • Getting Started
  • Development
  • Backend For Frontend (BFF)
  • Configuration
• Energy Origin
• Watt Design System
• Workspace
  • Applications
  • Libraries
  • Tools
• Scripts
• Workflows (CI/CD)
• Visual Studio Code
• Domain C4 model

General

The documentation in this README assumes the reader has a general understanding of Nx and Angular. For beginners in these technologies, the Core Nx Tutorial and Angular Tour of Heroes serves as a good introduction.

This repository is a monorepo which hosts serveral applications that all share the same dependencies (for example, every application is running the same version of Angular).

Note: Since this is an Nx workspace, the Nx CLI should be used over the Angular CLI.

Prerequisites

• Volta: Manager for JavaScript command-line tools like Node.js®, Yarn and Bun.
• Bun: Alternative to Node.js® and Yarn that this repository use. Can also be installed with Volta.
• .NET SDK: Required for running and developing DataHub.

DataHub

The application is deployed to the following environments:

Development 001	Development 002	Test 001	Test 002	PreProd	Prod
dev_001	dev_002	test_001	test_002	preprod	prod

Documentation

Be sure to check out the additional DataHub documentation for the following areas:

• Testing
• Mocking
• Feature Flags
• Logging with Application Insights

Getting Started

Before starting the development server, you must install localhost.crt in your list of locally trusted roots. Run the following command as an administrator from the root of the repository (Windows):

certutil -addstore -f "Root" localhost.crt

Use the following command to serve the DataHub application locally (with request mocking):

bun dh:mock

The application utilizes request mocking for some of the requests to the backend for frontend (BFF), but there are still features that are not mocked. When working with those features, it might be required to serve the BFF locally as well. To do so, run the following command (requires some initial setup, see Setup of BFF).

bun api:dev

Note: It is recommended to use mocking as much as possible, see mocking.md.

Development

When it is time to add a new library, refrain from writing files manually or copying from existing libraries. Instead, use the provided local generators that takes care of all the manual work and avoids common pitfalls.

Note: Make sure to read the Workspace section beforehand to understand which library type to generate. It is currently not possible to generate libraries of type assets and styles.

To generate a new library, run the below command* and follow the instructions:

bun nx g workspace-tools:library-generator

While rarely needed, it is also possible to generate an entirely new domain. Running the following command* will create a new domain with data-access-api, feature, and shell libraries included:

bun nx g workspace-tools:domain-generator

Also available in Nx Console.

Backend For Frontend (BFF)

There is currenly only one BFF located in api-dh under apps/dh. It is for app-dh and is using .NET 8.x. Check the Development notes for how to get started.

Configuration

Configuration files are located in the libs/dh/shared/assets/src/assets/configuration folder. These local configurations have a .local filename suffix, but is overridable by a configuration file without the suffix. For example, dh-api-environment.local.json configures the DataHub frontend to use a local DataHub API. To use a remote DataHub API, place a dh-api-environment.json file in the same folder and set the remote address in the relevant property.

Energy Origin

Use the following command to serve the Energy Origin application locally (with request mocking):

bun eo:mock

Watt Design System

Contributing? Check the Watt Design System README for developer documentation.

This is a shared UI library meant to be used by all frontend apps and it contains basic components and functionality for speeding up app development. It is located in libs/watt and can be imported from @energinet-datahub/watt in other libraries.

The design system is showcased using Storybook, and can be found here: Latest version (main)

To use components or other functionality from Watt, import as in the following example:

import { WattButtonComponent } from '@energinet-datahub/watt/button';

Workspace

The structure of the monorepo is based on general conventions from Nx with a few extensions. On the highest level the workspace is separated into apps and libs, with most of the logic placed within the libs folder. The apps should mostly be slim containers that links to functionality implemented in libraries.

On the top level, the workspace is divided into the following folders:

Energinet-DataHub/greenforce-frontend
├── apps      # Source code for applications
├── build     # Infrastructure related to deployment
├── dist      # Output files when building artifacts
├── docs      # General documentation
├── libs      # Source code for libraries
├── scripts   # Code needed for running certain commands
└── tools     # Logic for executing or generating code

Applications

Within the apps folders resides the applications, which includes frontends, BFF and E2E tests. These applications are prefixed with their type and further grouped by a product root folder. Expanding the apps folder looks like this:

...
└── apps            # Source code for applications
   ├── dh           # DataHub application (product root)
   │  ├── api-dh    # - BFF for DataHub
   │  ├── app-dh    # - Frontend for DataHub
   │  └── e2e-dh    # - E2E tests for DataHub
   └── eo           # Energy Origin (product root)
      ├── app-eo    # - Frontend for Energy Origin
      └── e2e-eo    # - E2E tests for Energy Origin

In other words, all applications must follow the naming scheme apps/<product>/<type>-<product>.

Below is an exhaustive list of permitted application types, along with their intended purpose, folder name and which library types they are allowed to have direct dependendies to:

Type	Description	Name	Allowed Dependencies
api	Serves as BFF for the product	api‑<product>	-
app	Entry point for the frontend	app‑<product>	shell environments assets styles
e2e	Runs E2E tests on the frontend	e2e‑<product>	e2e-util

Libraries

As mentioned above, libraries are where most of the logic goes. They are all either related to a single product or shared across multiple products*. There are many different library types which are listed further below, but they all follow the same naming convention:

The special gf product can be used for libraries that must be shared across multiple products.

...
└── libs                                      # Source code for libraries
   └── <product>                              # Libraries are grouped by a product root folder
      └── <domain>                            # Products can contain several domains ex. auth, core, etc.
         └── <library type>-<library name>    # Domains can contain several libraries prefixed by type
   └── watt                                   # Special product, see "Watt Design System" section

Note: Certain library types should not have a name; in that case simply omit the -<library name> suffix.

Following is an exhaustive list of permitted library types, what they should contain, their name and which other library* types they are allowed to depend on:

Only libraries of type data-access may have dependencies to apps and only apps of type api.

Library types

Type	Contains	Name	Allowed Dependencies
feature	Smart UI (with access to data sources) for specific business use cases or pages in an application.	feature‑<name>	assets configuration feature ui data‑access domain util test‑util environments
ui	Presentational logic (presentational components, pipes, presentational services, directives).	ui‑<name>	ui util test-util domain assets styles environments
data‑access	Code for interacting with a back-end system. It also includes all the code related to state management, and HTTP interceptors.	data‑access‑<name>	data-access util test-util domain environments
util	Low-level utilities used by many libraries and applications (services, pure functions, contants).	util‑<name>	util test-util environments domain
test‑util	Stubs, jest matchers, testing modules and test library configuration.	test‑util‑<name>	data-access util test-util domain configuration assets
e2e‑util	Cypress commands and fixtures.	e2e‑util‑<name>	util test-util e2e-util
domain	Interfaces, types, constants, functions and services related to domain objects.	domain	domain util test-util
shell	Entrypoint for an application or domain. Orchestration and routing.	shell	feature ui data-access util test-util e2e-util shell domain configuration environments assets styles
configuration	Configuration and setup of libraries and concerns (for example i18n).	configuration‑<name>	data-access util test-util configuration environments domain
environments	Code related to loading different environment configurations.	environments	util test-util environments assets
assets	Icons, images, fonts, JSON etc.	assets	assets
styles	SCSS functions, mixins, variables, partials, and global stylesheets.	styles	assets styles

Tools

This folder contains code only meant for use during development or within workflows. Expanding it looks like this:

...
└── tools/src
   ├── executors     # Perform all sorts of actions on your code
   ├── generators    # Automate tasks using code generation
   └── <helpers>     # Various other helper tools e.g. for scripting

Executors and generators are Nx inventions; for documentation on how to work with them, see Use Task Executors and Use Code Generators.

Scripts

• bun dep-graph: Generate a dependency graph for the applications in the monorepo.

Workflows (CI/CD)

The repository is using GitHub Actions workflows for automation including CI/CD pipelines for each application. Workflows are located in .github/workflows which currently contains the following:

• ci-orchestrator.yml - Markdown check and YAML validation, renders C4 model diagrams, detects changes to start relevant workflows and branch policy status check.
• clean-up-cache.yml - Cleanup GitHub workflow caches for closed branches.
• create-tokens.yml - Generates design tokens based on a JSON file exported from Figma.
• detect-changes.yml - Figures out what part of the codebase is affected by a change.
• dh-cd.yml: Used by DataHub for updating BFF code coverage, publishing a release, dispatching a deployment request, and dispatching a notification on failure.
• dh-ci-dotnet.yml - Verifies the ASP.NET Core Web API by building and running all tests. Used in ci-orchestrator.yml for verifying if PR merge is allowed.
• dh-ci-frontend.yml - Used by DataHub frontend for publishing a release and generating API clients. Used in ci-orchestrator.yml for verifying if PR merge is allowed.
• dh-healthchecks.yml - Runs E2E health check tests every hour against all DataHub environments.
• eo-cd.yml - Used by "Energy Origin" app.
• frontend-ci.yml - Used to build, format and lint all frontend apps. Also used for running unit, integration, component and E2E tests.
• license-check-ci.yml - Used to check for license headers in files and adding them if missing.
• production-dependencies-license-check.yml - Used for documenting used versions and licenses of production dependencies.
• watt-cd.yml - Used for publishing Watt to Chromatic and dispatching a notification on failure.
• watt-ci.yml - Used by Watt for verifying a production build can be created. Used in ci-orchestrator.yml for verifying if PR merge is allowed.

Bots are used for certain trivial tasks such as adding license headers to files, formatting code, fixing lint errors, and generating API clients based on OpenAPI. For this to work, bots have to use the repository secret PAT_TOKEN when pushing changes or creating releases that trigger a workflow. Only do this for idempotent tasks to prevent circular workflows from causing infinite workflow runs.

Visual Studio Code

It is recommended to use the Visual Studio Code editor, as it supports the entire toolchain of this repository and has been preconfigured with a list of recommended extensions stored in .vscode/extensions.json. The editor will automatically prompt for installing these extensions when the project is opened for the first time, but they can later be found by executing the Show recommended extensions command.

Domain C4 model

In the DataHub 3 project we use the C4 model to document the high-level software design.

The DataHub base model describes elements like organizations, software systems and actors. In domain repositories we should extend on this model and add additional elements within the DataHub 3.0 Software System (dh3).

The domain C4 model and rendered diagrams are located in the folder hierarchy docs/diagrams/c4-model and consists of:

• model.dsl: Structurizr DSL describing the domain C4 model.
• views.dsl: Structurizr DSL extending the dh3 software system by referencing domain C4 models using !include, and describing the views.
• views.json: Structurizr layout information for views.
• /views/*.png: A PNG file per view described in the Structurizr DSL.

This folder also contains package.json and package-lock.json to support the use of npm under this folder hierarchy. It is necessary for the rendering of diagrams handled by the workflow structurizr-render-diagrams.yml.

Maintenance of the C4 model should be performed using VS Code and a local version of Structurizr Lite running in Docker. See DataHub base model for a description of how to do this.

Thanks to all the people who already contributed