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## Overview
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The `ui` directory contains static files and templates used in the web UI. For
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easier distribution they are compressed (c.f. Makefile) and statically compiled
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into the Prometheus binary using the embed package.
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During development it is more convenient to always use the files on disk to
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directly see changes without recompiling.
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To make this work, remove the `builtinassets` build tag in the `flags` entry
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in `.promu.yml`, and then `make build` (or build Prometheus using
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`go build ./cmd/prometheus`).
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This will serve all files from your local filesystem. This is for development purposes only.
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## React-app
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### Introduction
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The react application is a monorepo composed by multiple different npm packages. The main one is `react-app` which
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contains the code of the react application.
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Then you have different npm packages located in the folder `modules`. These packages are supposed to be used by the
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react-app and also by others consumers (like Thanos)
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### Pre-requisite
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To be able to build the react application you need:
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* npm >= v7
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* node >= v16
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### Installing npm dependencies
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The React UI depends on a large number of [npm](https://www.npmjs.com/) packages. These are not checked in, so you will
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need to move to the directory `web/ui` and then download and install them locally via the npm package manager:
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npm install
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npm consults the `package.json` and `package-lock.json` files for dependencies to install. It creates a `node_modules`
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directory with all installed dependencies.
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**NOTE**: Do not run `npm install` in the `react-app` folder or in any sub folder of the `module` directory.
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### Upgrading npm dependencies
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As it is a monorepo, when upgrading a dependency, you have to upgrade it in every packages that composed this monorepo (
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aka, in all sub folder of `module` and in `react-app`)
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Then you have to run the command `npm install` in `web/ui` and not in a sub folder / sub package. It won't simply work.
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### Running a local development server
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You can start a development server for the React UI outside of a running Prometheus server by running:
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npm start
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This will open a browser window with the React app running on http://localhost:3000/. The page will reload if you make
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edits to the source code. You will also see any lint errors in the console.
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**NOTE**: It will reload only if you change the code in `react-app` folder. Any code changes in the folder `module` is
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not considered by the command `npm start`. In order to see the changes in the react-app you will have to
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run `npm run build:module`
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Due to a `"proxy": "http://localhost:9090"` setting in the `package.json` file, any API requests from the React UI are
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proxied to `localhost` on port `9090` by the development server. This allows you to run a normal Prometheus server to
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handle API requests, while iterating separately on the UI.
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[browser] ----> [localhost:3000 (dev server)] --(proxy API requests)--> [localhost:9090 (Prometheus)]
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### Running tests
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To run the test for the react-app and for all modules, you can simply run:
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```bash
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npm test
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```
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if you want to run the test only for a specific module, you need to go to the folder of the module and run
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again `npm test`.
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For example, in case you only want to run the test of the react-app, go to `web/ui/react-app` and run `npm test`
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To generate an HTML-based test coverage report, run:
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CI=true npm test:coverage
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This creates a `coverage` subdirectory with the generated report. Open `coverage/lcov-report/index.html` in the browser
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to view it.
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The `CI=true` environment variable prevents the tests from being run in interactive / watching mode.
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See the [Create React App documentation](https://create-react-app.dev/docs/running-tests/) for more information about
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running tests.
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### Building the app for production
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To build a production-optimized version of the React app to a `build` subdirectory, run:
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npm run build
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**NOTE:** You will likely not need to do this directly. Instead, this is taken care of by the `build` target in the main
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Prometheus `Makefile` when building the full binary.
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### Integration into Prometheus
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To build a Prometheus binary that includes a compiled-in version of the production build of the React app, change to the
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root of the repository and run:
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make build
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This installs dependencies via npm, builds a production build of the React app, and then finally compiles in all web
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assets into the Prometheus binary.
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