background.js

var upnpEventListener = null;

function upnpEventCallback(device, event) {
  chrome.runtime.sendMessage({
    type: 'deviceEvent',
    device: device,
    event: event
  });
}

function discoveryDeviceCallback(device) {
  chrome.runtime.sendMessage({
    type: 'deviceDiscovery',
    device: device
  });

  // Don't subscribe to events from Sonos BRIDGE device
  if (device.modelDescription === 'Sonos BRIDGE') {
    return;
  }

  // TODO: Allow foreground page to signal not to listen for events for this device
  // This would allow to ignore events for invisible Sonos devices
  // Track changes, play/stop events
  upnpEventListener.subscribeServiceEvent(device, 'AVTransport', upnpEventCallback);

  // Volume control events
  upnpEventListener.subscribeServiceEvent(device, 'RenderingControl', upnpEventCallback);

  // Queue change events
  upnpEventListener.subscribeServiceEvent(device, 'Queue', upnpEventCallback);

  // Group management events
  upnpEventListener.subscribeServiceEvent(device, 'GroupManagement', upnpEventCallback);
}

function discoveryTimeoutCallback() {
  chrome.runtime.sendMessage({
    type: 'discoveryTimeout'
  });
}

chrome.app.runtime.onLaunched.addListener(function() {
  chrome.app.window.create('zonos.html', {
    id: 'zonos',
    innerBounds: {
      width: 400,
      height: 500,
      minWidth: 400,
      minHeight: 500,
    }
  });

  upnpEventListener = new UpnpEventListener(3400, upnpEventCallback);
  new UpnpDiscovery(discoveryDeviceCallback, discoveryTimeoutCallback, 'urn:schemas-upnp-org:device:ZonePlayer:1');
});

chrome.runtime.onSuspend.addListener(function() {
  chrome.socket.destroy(upnpEventListener.socketId);
});