How to close a connection properly after a @live, @stream or @defer request has closed

[romeovs]

How to properly handle the user going away in a @live, @stream or @defer query (or a subscription)?

As far as I can tell there are no hooks to listen to subscriptions or streams closing or stopping.

This makes it hard to properly free up resources (like database connections) when the user goes away.

[EmrysMyrddin]

If you want to free up resources, you probably want to execute something after the end of the execution.
This can be done 9with the ExecuteDoneHook:

import { isAsyncIterable, Plugin } from '@envelop/types'

function myCustomPlugin() {
  async function cleanup() {
    // Free up whatever ressources you need here
  }

  return {
    onExeucte: () => ({
      onExecuteDone: result => isAsyncIterable(result) ? { onEnd: cleanup } : cleanup()
    })
  }
}