public async void Run(object state)
{
var response = await _client.GetAsync(_options.Value.UpstreamICalUrl);
response.EnsureSuccessStatusCode();
var stream = await response.Content.ReadAsStreamAsync();
var calendars = CalendarCollection.Load(stream);
var calendar = calendars.FirstOrDefault();
if (calendar is null)
{
_logger.LogWarning("Calendar is empty. Skipping sync");
return;
}
// Add or update events
var upstreamCalendarEvents = calendar.Events.OrderBy(x => x.Start).ToList();
foreach (var calendarEvent in upstreamCalendarEvents)
{
var entry = _mapper.Map <CalendarEventEntity>(calendarEvent);
entry.Source = _options.Value.UpstreamICalUrl;
await _calendarService.AddOrUpdateCalendarEntryAsync(entry);
}
// Purge obsolete events
var events = (await _calendarService.GetAllEventsAsync()).ToList();
var obsoleteEventIds = events.Where(x => x.Source == _options.Value.UpstreamICalUrl)
.Select(x => x.Id)
.Except(upstreamCalendarEvents
.Select(x => x.Uid));
// TODO: Add tests
foreach (var obsoleteEventId in obsoleteEventIds)
{
await _calendarService.RemoveEventAsync(obsoleteEventId);
}
_logger.LogInformation("Synchronized calendar from upstream source ({UpstreamSourceUrl})",
_options.Value.UpstreamICalUrl);
}