Example of backend datasource plugins writing data back to store?

[cbrake]

From the documentation, I found this:

Send a command to a device, such as a micro controller or IOT device.

Are there any examples that would show how this is done?

I’m working on integration with Simple IoT where we want to change configuration settings in a Grafana dashboard that then get written to SIOT.

I’ve experimented with the Button panel, but cors issues makes this messy. It would be much cleaner if I could run some Go code in the backend to talk NATS directly to SIOT.

[marcusolsson]

For a frontend data source solution, you can check out this code example.

For a backend data source solution, you can register a resource handler, which extends the Grafana HTTP API with plugin-specific endpoints, which you can then call from your dashboard.

Since you specifically asked for examples of data source plugins, here’s how you extend your backend plugin with a resource handler:

func (d *SampleDatasource) CallResource(ctx context.Context, req *backend.CallResourceRequest, sender backend.CallResourceResponseSender) error {
	items, err := d.client.ListItems()
	if err != nil {
		return err
	}

	b, err := json.Marshal(items)
	if err != nil {
		return err
	}

	return sender.Send(&backend.CallResourceResponse{
		Status: http.StatusOK,
		Body:   b,
	})
}

You can then access the plugin resource from: /api/datasources/<your-plugin-id>/resources/, where your-plugin-id is an integer that identifies the data source instance you want to access.

Here’s the frontend code to query the data source resource:

const items = await getBackendSrv()
                .fetch<any>({
                  url: `/api/datasources/${props.datasource.id}/resources/`,
                })
                .toPromise();

[cbrake]

thanks for the pointers!

[marcusolsson]

For anyone dropping in here from Google, I’ve shared a few more examples on how to use resource handlers in this post:

How to add a resource handler for your data source

The primary way for a data source to retrieve data is through the query method. But sometimes your data source needs to request auxiliary data on demand, for example to offer auto-completion inside the data source’s query editor. In this post, I want to show you how to add a resource handler to your data source. By adding a resource handler to your backend plugin, you can extend the Grafana HTTP API with your own data source-specific routes. Resource handler are great, not only for auto-comple…