Realm.open() hangs on Android

EDIT: This also happens after reloading the emulator on React Native, in a very simple setup (see below https://github.com/realm/realm-js/issues/1248#issuecomment-328313637)

Goals

Get an error message when opening a synced realm if server not available or user is offline.

Expected Results

Realm.open() returns a promise that gets rejected with useful error message.

Actual Results

The promise simply stays in pending status indefinitely.

This callback does not get called:

https://github.com/realm/realm-js/blob/416632c9adc7350cdca12dc792edcf3e9d0b30d8/lib/extensions.js#L47

Hence the promise never returns.

Steps to Reproduce

Run this code after log in with valid user:

const openRealm = (user, url, schema) => {
  return Realm.open({
    sync: { user, url },
    schema,
    schemaVersion: 1
  });
};

Version of Realm and Tooling

• Realm JS SDK Version: 1.10.3
• React Native: 0.44.3
• Which debugger for React Native: None

[Talor-A]

I’m able to reproduce this as well, on android the first app load works, but reloading JS code makes realm.open never resolve.

[ashwinphatak]

I’m able to reproduce the issue and indeed the callback to _waitForDownload never gets called.