private static async Task WriteTimetableAsync(Person person, Settings settings, int line)
{
var service = new GoogleCalendarService(person.Email);
var calendar = await service.GetTimetableCalendarIdAsync() ?? await service.CreateTimetableCalendarAsync();
ConsoleHelper.WriteProgress(line, 1);
var fields = "id,summary,location,start(dateTime),end(dateTime)";
var existing = await service.GetFutureEvents(calendar, DateTime.Today, fields);
var expected = CreateExpectedEvents(person, settings);
ConsoleHelper.WriteProgress(line, 2);
var comparer = new EventComparer();
var obsolete = existing.Except(expected, comparer);
var missing = expected.Except(existing, comparer);
await service.InsertEventsAsync(calendar, missing);
await service.DeleteEventsAsync(calendar, obsolete);
ConsoleHelper.WriteProgress(line, 3);
}
private static async Task MainAsync()
{
#if !DEBUG
try
{
#endif
Console.Clear();
Console.CursorVisible = false;
Console.WriteLine("TIMETABLE CALENDAR GENERATOR\n");
var settings = await LoadSettingsAsync();
var students = await LoadStudentsAsync();
var teachers = await LoadTeachersAsync();
GoogleCalendarService.Configure(settings.ServiceAccountKey);
Console.WriteLine("\nSetting up calendars:");
var tasks = new List <Task>();
var throttler = new SemaphoreSlim(initialCount: simultaneousRequests);
var people = students.Concat(teachers).ToList();
Console.SetBufferSize(Console.BufferWidth, Math.Max(headerHeight + people.Count + 1, Console.BufferHeight));
for (var i = 0; i < people.Count; i++)
{
var countLocal = i;
await Task.Delay(10);
await throttler.WaitAsync();
var person = people[countLocal];
tasks.Add(Task.Run(async() =>
{
try
{
var line = countLocal + headerHeight;
ConsoleHelper.WriteDescription(line, $"({countLocal + 1}/{people.Count}) {person.Email}");
ConsoleHelper.WriteProgress(line, 0);
for (var attempt = 1; attempt <= maxAttempts; attempt++)
{
try
{
await WriteTimetableAsync(person, settings, line);
break;
}
catch (Google.GoogleApiException) when(attempt < maxAttempts)
{
var backoff = retryFirst * (int)Math.Pow(retryExponent, attempt - 1);
ConsoleHelper.WriteStatus(line, $"Error. Retrying ({attempt} of {maxAttempts - 1})...", ConsoleColor.DarkYellow);
await Task.Delay(backoff);
}
catch (Exception exc)
{
ConsoleHelper.WriteStatus(line, $"Failed. {exc.Message}", ConsoleColor.Red);
break;
}
}
}
finally
{
throttler.Release();
}
}));
}
await Task.WhenAll(tasks);
Console.SetCursorPosition(0, headerHeight + people.Count);
Console.WriteLine("\nCalendar generation complete.\n");
#if !DEBUG
}
catch (Exception exc)
{
ConsoleHelper.WriteError(exc.Message);
}
#endif
if (waitForInput)
{
Console.ReadKey();
}
}
