mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-18 03:24:05 -08:00
111 lines
4.3 KiB
Markdown
111 lines
4.3 KiB
Markdown
## Overview
|
|
|
|
The `ui` directory contains static files and templates used in the web UI. For easier distribution they are statically
|
|
compiled into the Prometheus binary using the vfsgen library (c.f. Makefile).
|
|
|
|
During development it is more convenient to always use the files on disk to directly see changes without recompiling. To
|
|
make this work, remove the `builtinassets` build tag in the `flags` entry in `.promu.yml`, and then `make build` (or
|
|
build Prometheus using
|
|
`go build ./cmd/prometheus`).
|
|
|
|
This will serve all files from your local filesystem. This is for development purposes only.
|
|
|
|
## React-app
|
|
|
|
### Introduction
|
|
|
|
The react application is a monorepo composed by multiple different npm packages. The main one is `react-app` which
|
|
contains the code of the react application.
|
|
|
|
Then you have different npm packages located in the folder `modules`. These packages are supposed to be used by the
|
|
react-app and also by others consumers (like Thanos)
|
|
|
|
### Pre-requisite
|
|
|
|
To be able to build the react application you need:
|
|
|
|
* npm >= v7
|
|
* node >= v16
|
|
|
|
### Installing npm dependencies
|
|
|
|
The React UI depends on a large number of [npm](https://www.npmjs.com/) packages. These are not checked in, so you will
|
|
need to move to the directory `web/ui` and then download and install them locally via the npm package manager:
|
|
|
|
npm install
|
|
|
|
npm consults the `package.json` and `package-lock.json` files for dependencies to install. It creates a `node_modules`
|
|
directory with all installed dependencies.
|
|
|
|
**NOTE**: Do not run `npm install` in the `react-app` folder or in any sub folder of the `module` directory.
|
|
|
|
### Upgrading npm dependencies
|
|
|
|
As it is a monorepo, when upgrading a dependency, you have to upgrade it in every packages that composed this monorepo (
|
|
aka, in all sub folder of `module` and in `react-app`)
|
|
|
|
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.
|
|
|
|
### Running a local development server
|
|
|
|
You can start a development server for the React UI outside of a running Prometheus server by running:
|
|
|
|
npm start
|
|
|
|
This will open a browser window with the React app running on http://localhost:3000/. The page will reload if you make
|
|
edits to the source code. You will also see any lint errors in the console.
|
|
|
|
**NOTE**: It will reload only if you change the code in `react-app` folder. Any code changes in the folder `module` is
|
|
not considered by the command `npm start`. In order to see the changes in the react-app you will have to
|
|
run `npm run build:module`
|
|
|
|
Due to a `"proxy": "http://localhost:9090"` setting in the `package.json` file, any API requests from the React UI are
|
|
proxied to `localhost` on port `9090` by the development server. This allows you to run a normal Prometheus server to
|
|
handle API requests, while iterating separately on the UI.
|
|
|
|
[browser] ----> [localhost:3000 (dev server)] --(proxy API requests)--> [localhost:9090 (Prometheus)]
|
|
|
|
### Running tests
|
|
|
|
To run the test for the react-app and for all modules, you can simply run:
|
|
|
|
```bash
|
|
npm test
|
|
```
|
|
|
|
if you want to run the test only for a specific module, you need to go to the folder of the module and run
|
|
again `npm test`.
|
|
|
|
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`
|
|
|
|
To generate an HTML-based test coverage report, run:
|
|
|
|
CI=true npm test:coverage
|
|
|
|
This creates a `coverage` subdirectory with the generated report. Open `coverage/lcov-report/index.html` in the browser
|
|
to view it.
|
|
|
|
The `CI=true` environment variable prevents the tests from being run in interactive / watching mode.
|
|
|
|
See the [Create React App documentation](https://create-react-app.dev/docs/running-tests/) for more information about
|
|
running tests.
|
|
|
|
### Building the app for production
|
|
|
|
To build a production-optimized version of the React app to a `build` subdirectory, run:
|
|
|
|
npm run build
|
|
|
|
**NOTE:** You will likely not need to do this directly. Instead, this is taken care of by the `build` target in the main
|
|
Prometheus `Makefile` when building the full binary.
|
|
|
|
### Integration into Prometheus
|
|
|
|
To build a Prometheus binary that includes a compiled-in version of the production build of the React app, change to the
|
|
root of the repository and run:
|
|
|
|
make build
|
|
|
|
This installs dependencies via npm, builds a production build of the React app, and then finally compiles in all web
|
|
assets into the Prometheus binary.
|