Remove the node from Firebase immediately upon losing network connectivity

I have an Angular application where I am managing users' online/offline status in Firebase. My goal is to delete a user's data from Firebase immediately after their internet connection goes offline. Here is the code snippet I currently have in my Angular project:

const db = getDatabase();
const connectedRef = ref(db, '.info/connected');

var myPresenceRef = this.angularFireDatabase.database.ref(
  '/presence/' + this.userInfo['username']
);

onValue(connectedRef, (snap) => {
  if (snap.val() === true) {
    console.log('Connected to database');
  } else {
    myPresenceRef.onDisconnect().remove();
  }

I want to ensure the data is deleted instantly when the internet connection is lost. How can I achieve this implementation?

javascriptfirebasefirebase-realtime-database

Answer №1

It is not possible to immediately trigger the deletion process once the connection has been terminated.

  • Once disconnected, the client loses the ability to initiate a delete action as it no longer communicates with the server.
  • The server will only execute the onDisconnect() handler after detecting that the client has left.
    • This detection may occur instantly if the disconnection was planned, with the client informing the server about its departure.
    • In cases of an abrupt disconnect, it may take a few minutes for the server to recognize the absence of the client. This delay is inherent in how internet connections operate, rather than a deliberate choice by the system.

It appears to be a scenario where the focus should shift from how to implement a solution to understanding what needs to be achieved and aligning it with the capabilities of the product(s) being utilized.

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