protected override async Task EmitBatchAsync(IEnumerable <LogEvent> events)
{
_nextRequiredLevelCheckUtc = DateTime.UtcNow.Add(RequiredLevelCheckInterval);
string payload, payloadContentType;
if (_useCompactFormat)
{
payloadContentType = SeqApi.CompactLogEventFormatMimeType;
payload = FormatCompactPayload(events, _eventBodyLimitBytes);
}
else
{
payloadContentType = SeqApi.RawEventFormatMimeType;
payload = FormatRawPayload(events, _eventBodyLimitBytes);
}
var content = new StringContent(payload, Encoding.UTF8, payloadContentType);
if (!string.IsNullOrWhiteSpace(_apiKey))
{
content.Headers.Add(SeqApi.ApiKeyHeaderName, _apiKey);
}
var result = await _httpClient.PostAsync(SeqApi.BulkUploadResource, content).ConfigureAwait(false);
if (!result.IsSuccessStatusCode)
{
throw new LoggingFailedException($"Received failed result {result.StatusCode} when posting events to Seq");
}
var returned = await result.Content.ReadAsStringAsync();
_controlledSwitch.Update(SeqApi.ReadEventInputResult(returned));
}
async Task OnTick()
{
LogEventLevel?minimumAcceptedLevel = null;
try
{
int count;
do
{
count = 0;
// Locking the bookmark ensures that though there may be multiple instances of this
// class running, only one will ship logs at a time.
using (var bookmark = IOFile.Open(_bookmarkFilename, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.Read))
{
long nextLineBeginsAtOffset;
string currentFile;
TryReadBookmark(bookmark, out nextLineBeginsAtOffset, out currentFile);
var fileSet = GetFileSet();
if (currentFile == null || !IOFile.Exists(currentFile))
{
nextLineBeginsAtOffset = 0;
currentFile = fileSet.FirstOrDefault();
}
if (currentFile == null)
{
continue;
}
var payload = ReadPayload(currentFile, ref nextLineBeginsAtOffset, ref count);
if (count > 0 || _controlledSwitch.IsActive && _nextRequiredLevelCheckUtc < DateTime.UtcNow)
{
lock (_stateLock)
{
_nextRequiredLevelCheckUtc = DateTime.UtcNow.Add(RequiredLevelCheckInterval);
}
var content = new StringContent(payload, Encoding.UTF8, "application/json");
if (!string.IsNullOrWhiteSpace(_apiKey))
{
content.Headers.Add(SeqApi.ApiKeyHeaderName, _apiKey);
}
var result = await _httpClient.PostAsync(SeqApi.BulkUploadResource, content).ConfigureAwait(false);
if (result.IsSuccessStatusCode)
{
_connectionSchedule.MarkSuccess();
WriteBookmark(bookmark, nextLineBeginsAtOffset, currentFile);
var returned = await result.Content.ReadAsStringAsync().ConfigureAwait(false);
minimumAcceptedLevel = SeqApi.ReadEventInputResult(returned);
}
else if (result.StatusCode == HttpStatusCode.BadRequest ||
result.StatusCode == HttpStatusCode.RequestEntityTooLarge)
{
// The connection attempt was successful - the payload we sent was the problem.
_connectionSchedule.MarkSuccess();
await DumpInvalidPayload(result, payload).ConfigureAwait(false);
WriteBookmark(bookmark, nextLineBeginsAtOffset, currentFile);
}
else
{
_connectionSchedule.MarkFailure();
SelfLog.WriteLine("Received failed HTTP shipping result {0}: {1}", result.StatusCode, await result.Content.ReadAsStringAsync().ConfigureAwait(false));
break;
}
}
else
{
// For whatever reason, there's nothing waiting to send. This means we should try connecting again at the
// regular interval, so mark the attempt as successful.
_connectionSchedule.MarkSuccess();
// Only advance the bookmark if no other process has the
// current file locked, and its length is as we found it.
if (fileSet.Length == 2 && fileSet.First() == currentFile && IsUnlockedAtLength(currentFile, nextLineBeginsAtOffset))
{
WriteBookmark(bookmark, 0, fileSet[1]);
}
if (fileSet.Length > 2)
{
// Once there's a third file waiting to ship, we do our
// best to move on, though a lock on the current file
// will delay this.
IOFile.Delete(fileSet[0]);
}
}
}
}while (count == _batchPostingLimit);
}
catch (Exception ex)
{
SelfLog.WriteLine("Exception while emitting periodic batch from {0}: {1}", this, ex);
_connectionSchedule.MarkFailure();
}
finally
{
lock (_stateLock)
{
_controlledSwitch.Update(minimumAcceptedLevel);
if (!_unloading)
{
SetTimer();
}
}
}
}
