Capturing Exception from Service Worker

I’m trying to track exceptions happening inside a service worker to Sentry. I have a very basic setting and everything seams to be fine, except that the error are never sent (or even tried to be send to sentry). The code looks something like this:

self.importScripts('https://cdn.ravenjs.com/3.19.1/raven.min.js');
Raven.config('sentryPublicKey').install();

self.addEventListener('install', function(event) {
  try {
    // some actions
  } catch (err) {
    console.log(Raven.isSetup());
    Raven.captureException(err);
  }
});

The console.log(Raven.isSetup()); line always print true, so Raven should be correctly set up at this point. And the line Raven.captureException(err); doesn’t show any kind of error, but it doesn’t do anything either. There’s something that makes sentry not being able to run inside a service worker? Some one knows if there is a way to achieve this? Thanks a lot!

[kamilogorek]

Hey @coluccini, ServiceWorkers doesn’t have an access to XHR APIs, therefore it cannot communicate with an outside world – https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API

It is designed to be fully async; as a consequence, APIs such as synchronous XHR and localStorage can’t be used inside a service worker.

I’ll look into how this can be handled soon.

[kamilogorek]

There’s already a PR for this https://github.com/getsentry/raven-js/pull/1115 I’ll try to merge it before the end of the week.

Can we use https://github.com/github/fetch so that modern browsers use fetch implementation and use XHR APIs for fallback?

Not really, it’ll increase a total size of raven, which we want to mitigate.