704840a8ad
* cmd, dashboard: remove custom assets, webpack dev server * dashboard: yarn commands, small fixes
59 lines
3.3 KiB
Markdown
59 lines
3.3 KiB
Markdown
## Go Ethereum Dashboard
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The dashboard is a data visualizer integrated into geth, intended to collect and visualize useful information of an Ethereum node. It consists of two parts:
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* The client visualizes the collected data.
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* The server collects the data, and updates the clients.
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The client's UI uses [React][React] with JSX syntax, which is validated by the [ESLint][ESLint] linter mostly according to the [Airbnb React/JSX Style Guide][Airbnb]. The style is defined in the `.eslintrc` configuration file. The resources are bundled into a single `bundle.js` file using [Webpack][Webpack], which relies on the `webpack.config.js`. The bundled file is referenced from `dashboard.html` and takes part in the `assets.go` too. The necessary dependencies for the module bundler are gathered by [Node.js][Node.js].
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### Development and bundling
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As the dashboard depends on certain NPM packages (which are not included in the `go-ethereum` repo), these need to be installed first:
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```
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$ (cd dashboard/assets && yarn install && yarn flow)
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```
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Normally the dashboard assets are bundled into Geth via `go-bindata` to avoid external dependencies. Rebuilding Geth after each UI modification however is not feasible from a developer perspective. Instead, we can run `yarn dev` to watch for file system changes and refresh the browser automatically.
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```
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$ geth --dashboard --vmodule=dashboard=5
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$ (cd dashboard/assets && yarn dev)
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```
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To bundle up the final UI into Geth, run `go generate`:
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```
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$ (cd dashboard && go generate)
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```
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### Static type checking
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Since JavaScript doesn't provide type safety, [Flow][Flow] is used to check types. These are only useful during development, so at the end of the process Babel will strip them.
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To take advantage of static type checking, your IDE needs to be prepared for it. In case of [Atom][Atom] a configuration guide can be found [here][Atom config]: Install the [Nuclide][Nuclide] package for Flow support, making sure it installs all of its support packages by enabling `Install Recommended Packages on Startup`, and set the path of the `flow-bin` which were installed previously by `yarn`.
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For more IDE support install the `linter-eslint` package too, which finds the `.eslintrc` file, and provides real-time linting. Atom warns, that these two packages are incompatible, but they seem to work well together. For third-party library errors and auto-completion [flow-typed][flow-typed] is used.
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### Have fun
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[Webpack][Webpack] offers handy tools for visualizing the bundle's dependency tree and space usage.
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* Generate the bundle's profile running `yarn stats`
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* For the _dependency tree_ go to [Webpack Analyze][WA], and import `stats.json`
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* For the _space usage_ go to [Webpack Visualizer][WV], and import `stats.json`
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[React]: https://reactjs.org/
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[ESLint]: https://eslint.org/
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[Airbnb]: https://github.com/airbnb/javascript/tree/master/react
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[Webpack]: https://webpack.github.io/
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[WA]: http://webpack.github.io/analyse/
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[WV]: http://chrisbateman.github.io/webpack-visualizer/
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[Node.js]: https://nodejs.org/en/
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[Flow]: https://flow.org/
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[Atom]: https://atom.io/
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[Atom config]: https://medium.com/@fastphrase/integrating-flow-into-a-react-project-fbbc2f130eed
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[Nuclide]: https://nuclide.io/docs/quick-start/getting-started/
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[flow-typed]: https://github.com/flowtype/flow-typed
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