Cloud functions for handling Firebase errors

Question

I am wondering how to write node.js code correctly when I received the promises chain, and I need to update the database in real time if something goes wrong?

Here is the code:

export const testErrorHandling = functions.database
      .ref('/workqueue/{pushId}/something').onWrite(event => {

  // Exit when the data is deleted.
  if (!event.data.exists()) {
    return;
  }

  //This is the retry count, give up if more than 5 times have been retried.
  const data = event.data.val()
  if (data.count >= 5) {
    return
  }

  return event.data.ref.root.child(data.fulluri).once('value').then(snapshot => {
    //Process all, if ok, delete the work queue entry
    return event.data.ref.remove()  
  }).catch(exception => {
    console.log('Error!: ' + exception)

    //Log error, increase retry count by one an write to that 
    //location to trigger a retry

    //Is the line below OK?
    //return event.data.ref.child('count').set(data.count + 1)
  })

})

I would suggest that this is a common requirement in many cases, but cannot find an example, since all the examples seem to just be written to console.error and executed. (What rarely happens in the real world.)

Answer 1

[ Firebase] . , , - ( Promise.race, ).

. , . , / ? ?