async Task DoAsyncWork()
{
if (await ExposureNotification.IsEnabledAsync())
{
await ExposureNotification.UpdateKeysFromServer();
}
}
static Task PlatformScheduleFetch()
{
// This is a special ID suffix which iOS treats a certain way
// we can basically request infinite background tasks
// and iOS will throttle it sensibly for us.
var id = AppInfo.PackageName + ".exposure-notification";
void scheduleBgTask()
{
var newBgTask = new BGProcessingTaskRequest(id);
newBgTask.RequiresNetworkConnectivity = true;
BGTaskScheduler.Shared.Submit(newBgTask, out _);
}
BGTaskScheduler.Shared.Register(id, null, async t =>
{
if (await PlatformIsEnabled())
{
var cancelSrc = new CancellationTokenSource();
t.ExpirationHandler = cancelSrc.Cancel;
Exception ex = null;
try
{
await ExposureNotification.UpdateKeysFromServer();
}
catch (Exception e)
{
ex = e;
}
t.SetTaskCompleted(ex != null);
}
scheduleBgTask();
});
scheduleBgTask();
return(Task.CompletedTask);
}
protected override async void OnHandleWork(Intent workIntent)
{
if (workIntent.Action == ExposureNotificationCallbackBroadcastReceiver.ActionExposureStateUpdated)
{
var summary = await ExposureNotification.AndroidGetExposureSummary();
if (summary != null && summary.MatchedKeyCount > 0)
{
// Invoke the custom implementation handler code with the summary info
await ExposureNotification.Handler.ExposureDetected(
summary,
() => ExposureNotification.GetExposureInformationAsync());
}
}
else if (workIntent.Action == ExposureNotificationCallbackBroadcastReceiver.ActionRequestDiagnosisKeys)
{
// Go fetch latest keys from server
await ExposureNotification.UpdateKeysFromServer();
}
}
