README.md

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# Luminous

Luminous is a framework for creating dashboards within [Phoenix Live
View](https://www.phoenixframework.org/). It is somewhat inspired by
grafana both conceptually and functionally in that:

- it focuses on time series data (albeit not exclusively)
- it is organized around panels
- it is parameterized by a time range
- it can be parameterized by user-defined variables

Dashboards are defined at compile time using elixir code (see
`Luminous.Dashboard.define/4`). At runtime, Luminous uses the
following javascript libraries (as [live view
hooks](https://hexdocs.pm/phoenix_live_view/js-interop.html#client-hooks-via-phx-hook))
for supporting client-side visualizations and interactions with the
live view process:

- [chartjs](https://www.chartjs.org/) for rendering plots
- [tabulator](https://tabulator.info/) for rendering tabular data
- [flatpickr](https://flatpickr.js.org/) for time range selection

## Features

- Time range selection and refresh of all dashboard panel queries
- Asynchronous queries and page updates
- User-facing variable dropdowns that are available to panel queries
- Client-side zoom in charts
- Multiple supported chart types (currently `:line` and `:bar`)
- Download panel data (CSV, PNG)
- Stat panels (show single or multiple stats)
- Table panels
- Summary statistics in charts

## Installation

The package can be installed from `hex.pm` as follows:

```elixir
def deps do
  [
    {:luminous, "~> 1.1.2"}
  ]
end
```

In order to be able to use the provided components, the library's
`javascript` and `CSS` files must be imported to your project:

In `assets/js/app.js`:

```javascript
import { ChartJSHook, TableHook, TimeRangeHook } from "luminous"

let Hooks = {
  TimeRangeHook: new TimeRangeHook(),
  ChartJSHook: new ChartJSHook(),
  TableHook: new TableHook()
}

...

let liveSocket = new LiveSocket("/live", Socket, {
  ...
  hooks: Hooks
})
...
```

Finally, in `assets/css/app.css`:
```CSS
@import "../../deps/luminous/dist/luminous.css";
```

## Usage

A [demo dashboard](dev/demo_dashboard_live.ex) has been provided that
showcases some of Luminous' capabilities.

The demo can be inspected live using the project's dev server (run
`mix dev` in the project and then visit [this
page](http://localhost:5000/demo)).

Luminous is a framework in the sense that the luminous client is
responsible for specifying queries, variables etc. and `Luminous.Live`
will call the client's code by setting up all the required plumbing.

In general, a custom dashboard needs to:

- implement the `Luminous.Variable` behaviour for the
  dashboard-specific variables
- implement the `Luminous.Query` behaviour for loading the necessary
  data that will be visualized in the client
- implement the `Luminous.TimeRangeSelector` behaviour for determining
  the default time range for the dashboard
- `use` the `Luminous.Live` module for leveraging the live dashboard
  functionality and capabilities
- render the dashboard in the view template (only
  `Luminous.Components.dashboard` is necessary but the layout can be
  customized by using directly the various components in
  `Luminous.Components`)