Confirmation of a socket connection

Picking up from @ToryByte’s tweet: https://twitter.com/ToryByte/status/1267225319947280385

Is there a way to wait for a subscription to connect? I cant find a way to wait for a subscription to be ready before I start running other statements. It would be nice if subscribe() returned a promise.

[VictorioBerra]

This does help, this means that I can poll those until they return true.

Consider a use case for say, an ExpressJS app. You would want to launch your Express app but not start accepting requests until all your sockets were connected and ready.

[w3b6x9]

This can be accomplished now depending on which version of realtime-js you’re using.

If you’re using realtime-js master/v1 then you can do:

 const mySubscription = supabase
  .from('*')
  .on('*', payload => {
    console.log('Change received!', payload)
  })
  .subscribe()
  .receive('ok', () => console.log('Subscribed successfully so do something'))

If you’re using realtime-js rc/v2 then you can do:

 const myChannel = supabase
  .channel('any')
  .on('postgres_changes', { event: '*', schema: 'public' }, payload => {
    console.log('Change received!', payload)
  })
  .subscribe(status => {
    if (status === 'SUBSCRIBED') {
       console.log('Subscribed successfully so do something')
    }
  })