Couldn’t find any questions/resources on this, hope I didn’t miss it.
What I want to do: Insert a variable into a query using my custom datasource
I’ve created a custom datasource plugin. It is based on the typescript datasource template. The idea is similar to the simplejson plugin: create a json request based on a user’s query. I’d like to set a template variable to control a field in the query, similar to $app or $server from this example:
If I have created a variable called $device, with the Graphite datasource, I am able to simply type into the query field “$app” and it will be set by the corresponding variable. For my custom datasource, this doesn’t work. However, typing “$device” in the title for the graph does set the title to the value of the variable! I am guessing I need to hook something up in either datasource or query_ctrl but I have no clue what.
What I’ve tried:
Simply typing “$device” into the query field:
This makes the query literally “$device” instead of the value of the $app variable.
In the datasource code, I can also check for the if the variable exists and put its value into the query, but this doesn’t reflect the change in the UI and is very hacky. I tried reading through Graphite source to figure out how they do it but couldn’t figure it out.
I am guessing it has something to do with templateSrv(), but I have no clue how.
Appreciate any and all help.