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TiDB Lightning Web Interface

TiDB Lightning provides a web interface for local monitoring task control. The app is written using Material-UI based on React.

Building

The web app requires npm to build. It can be compiled by running webpack in this directory

# from `web/src/*` produces `web/dist/*`
cd web/
npm install
npm run build

or, equivalently, running the make command in the parent directory.

# from `web/src/*` produces `web/dist/*`
make web

The output can be found in the web/dist/ folder. Lightning embeds the entire web/dist/ folder into Go code via vfsgen. The web app compilation and Go code conversion can be done via the make command

# from `web/dist/*` produces `lightning/web/res_vfsdata.go`
make data_parsers

For web development, you could build a special version of tidb-lightning which reads directly from web/dist/ by

make lightning_for_web

Run bin/tidb-lightning --server-mode --status-addr 127.0.0.1:8289, then open http://127.0.0.1:8289/ to use the web interface.

Local development tools like webpack-dev-server are not yet supported, since we do not allow cross-origin requests yet.

Front-end

The TiDB Lightning web interface is a single-page application (SPA). The file public/index.html is the HTML template before rendering. The actual source code are written in TypeScript in the src/* folder.

The application is divided into 3 "pages":

ProgressPage (reachable by clicking the "TiDB Lightning" link on the TitleBar)

TableProgressPage (reachable by clicking the ">" button on a TableProgressCard)

InfoPage (reachable by clicking the "ⓘ" InfoButton on the TitleBar)

The components inside the TitleBar and each page are highlighted in the above images. The associated dialogs and menus are embedded into each component directly.

Back-end

The "back-end" is Lightning itself. The API defined by Lightning is declared in src/api.ts. The corresponding server code is in lightning/lightning.go. Unless otherwise specified, all APIs return JSON and is in the form {"error": "message"} in case of error.

There is also an OpenAPI (Swagger) definition, but this is only a best-effort documentation of the current API. It should not be taken as a normative reference.