private async Task ProcessMessages()
{
using (var client = _settings.GetImapClient())
{
ImapUtils.InitMailboxes(client, _endpointName);
if (_purgeOnStartup)
{
ImapUtils.PurgeMailboxes(client, _endpointName);
}
client.Inbox.Open(FolderAccess.ReadWrite);
var query = SearchQuery.SubjectContains($"NSB-MSG-{_endpointName}-");
// Listen to new messages
void CheckForNewMessages(object o, EventArgs args)
{
_log.Debug("Mailbox count changed.");
_timeoutTokenSource.Cancel();
}
client.Inbox.CountChanged += CheckForNewMessages;
_cancellationTokenSource = new CancellationTokenSource();
while (!_cancellationTokenSource.IsCancellationRequested)
{
_timeoutTokenSource = new CancellationTokenSource(TimeSpan.FromMinutes(5));
using (_timeoutTokenSource)
{
try
{
foreach (var m in client.Inbox.Search(query))
{
_log.Debug($"Processing message with UID: {m}.");
await ProcessMessageWithTransaction(client, m);
}
if (client.Capabilities.HasFlag(ImapCapabilities.Idle))
{
_log.Debug("Waiting for IDLE from IMAP server.");
await client.IdleAsync(_timeoutTokenSource.Token, _cancellationTokenSource.Token);
}
else
{
_log.Debug("Waiting for new messages...");
client.NoOp(_cancellationTokenSource.Token);
WaitHandle.WaitAny(new[] { _timeoutTokenSource.Token.WaitHandle, _cancellationTokenSource.Token.WaitHandle });
}
}
catch (OperationCanceledException)
{
}
catch (ImapProtocolException)
{
break;
}
catch (ImapCommandException)
{
break;
}
catch (Exception ex)
{
_log.Error(ex.Message, ex);
_criticalError.Raise(ex.Message, ex);
}
}
}
}
}