private CloudAppendBlob GetBlob(DateTime eventTime)
{
string tagName = eventTime.ToString("yyyy-MM-dd");
if (tagName != _currentTagName)
{
_currentTagName = tagName;
_appendBlob = _blobContainer.GetAppendBlobReference($"{_blobNamePrefix}{_currentTagName}.txt");
if(!_appendBlob.Exists()) _appendBlob.CreateOrReplace();
}
return _appendBlob;
}
protected override void Write(LogEventInfo logEvent)
{
if (_client == null)
{
return;
}
string containerName = Container.Render(logEvent);
string blobName = BlobName.Render(logEvent);
if (_container == null || _container.Name != containerName)
{
_container = _client.GetContainerReference(containerName);
_blob = null;
}
if (_blob == null || _blob.Name != blobName)
{
_blob = _container.GetAppendBlobReference(blobName);
if (!_blob.Exists())
{
try
{
_blob.Properties.ContentType = "text/plain";
_blob.CreateOrReplace(AccessCondition.GenerateIfNotExistsCondition());
}
catch (StorageException ex) when (ex.RequestInformation.HttpStatusCode == (int) HttpStatusCode.Conflict)
{
// to be expected
}
}
}
_blob.AppendText(Layout.Render(logEvent) + "\r\n", Encoding.UTF8);
}
private void InstanciateStorageBlob(string formattedStorageContainerName, string formattedStorageBlobName)
{
if ((_appendBlob == null) || (_appendBlob.Name != formattedStorageBlobName))
{
_appendBlob = _blobContainer.GetAppendBlobReference(formattedStorageBlobName);
if (!_appendBlob.Exists())
{
try
{
_appendBlob.CreateOrReplace(AccessCondition.GenerateIfNotExistsCondition(), null, null);
}
catch (StorageException storageException)
{
WriteDebugError(String.Format("NLog.AzureStorage - Failed to create Azure Storage Append Blob '{0}' in the Container '{1}' - Storage Exception: {2} {3}", formattedStorageBlobName, formattedStorageContainerName, storageException.Message, GetStorageExceptionHttpStatusMessage(storageException)));
throw;
}
}
}
}