private async Task RunUploader()
{
TimeSpan errorDelay = _serverErrorBackoffSettings.Delay;
while (true)
{
IEnumerable <LogEntryExtra> entries;
// Wait/loop until there are some log entries that need uploading.
// TODO: See if log4net can be shutdown. If so, then this loop needs to terminate after
// all log entries have been uploaded.
while (true)
{
DateTimeRange logEntriesLost;
lock (_lockObj)
{
logEntriesLost = _logEntriesLost;
_logEntriesLost = null;
}
entries = await _logQ.PeekAsync(_maxUploadBatchSize - (logEntriesLost != null ? 1 : 0));
if (logEntriesLost != null)
{
var lostEntryExtra = new LogEntryExtra(-1, MakeLostEntry(logEntriesLost));
entries = (new[] { lostEntryExtra }).Concat(entries ?? Enumerable.Empty <LogEntryExtra>());
}
if (entries != null && entries.Count() > 0)
{
// There are log entries that need uploading, so do that now.
break;
}
await _uploadReadyEvent.WaitAsync();
}
// Upload entries to the Cloud Logging server
try
{
await _client.WriteLogEntriesAsync("", null, s_emptyLabels, entries.Select(x => x.Entry));
await _logQ.RemoveUntilAsync(entries.Last().Id);
_emptyEvent.Set();
errorDelay = _serverErrorBackoffSettings.Delay;
}
catch (Exception)
{
// Always retry, regardless of error, as there's nothing much else to be done.
await _scheduler.Delay(errorDelay);
errorDelay = errorDelay.Scale(_serverErrorBackoffSettings.DelayMultiplier);
if (errorDelay > _serverErrorBackoffSettings.MaxDelay)
{
errorDelay = _serverErrorBackoffSettings.MaxDelay;
}
}
}
}
public LogEntryExtraSize(LogEntryExtra logEntryExtra, int size)
{
LogEntryExtra = logEntryExtra;
Size = size;
}