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* remove vfsgen usages Signed-off-by: Jan Fajerski <jfajersk@redhat.com> * web: use embed package for static assets This requires go 1.16. Signed-off-by: Jan Fajerski <jfajersk@redhat.com> * circleci: drop go generate in web/ui Signed-off-by: Jan Fajerski <jfajersk@redhat.com> * Makefile: compress web assets before build This commit add compression before (and decompression after) prometheus is build. This ensures that gzipped assets are embeded in the prometheus binary, if the builtinassets build tag is passed. If the build tag is not passed this step is still executed but has no effect. All this is executed in a subshell so that we can run the decompress step even if the build step fails, but retain the exit code of promu. This cleanup could also cover interrupts, but I left that out for now. Signed-off-by: Jan Fajerski <jfajersk@redhat.com>
112 lines
4.4 KiB
Markdown
112 lines
4.4 KiB
Markdown
## 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 compressend (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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