public Task <bool> CopyTo(Stream stream, CancellationToken cancellationToken)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
return(stream.CanSeek
? _errorHandler.HandleErrors(() => CopyToImpl(stream, cancellationToken), _stream.FileInfo.Filename, cancellationToken)
: CopyToImpl(stream, cancellationToken));
}
public Task <bool> CopyTo(Stream stream, CancellationToken cancellationToken)
{
if (stream is null)
{
throw new ArgumentNullException(nameof(stream));
}
const int MinBufferSize = 81920;
const int MaxBufferSize = 1 << 20;
var bufferSize = Math.Min(Math.Max(_stream.FileInfo.ChunkSizeBytes, MinBufferSize), MaxBufferSize);
return(_errorHandler.HandleErrors(
Copy,
Filename,
() => (stream.CanSeek && _stream.CanSeek) || _stream.Position == 0,
cancellationToken));
async Task <bool> Copy()
{
var position = stream.CanSeek ? stream.Position : 0;
try
{
if (_stream.Position != 0)
{
_stream.Position = 0;
}
await _stream.CopyToAsync(stream, bufferSize, cancellationToken);
}
catch (GridFSChunkException) when(position == 0 && _stream.Position == 0)
{
return(false);
}
catch (GridFSChunkException) when(stream.CanSeek)
{
stream.SetLength(position);
return(false);
}
catch when(stream.CanSeek)
{
stream.SetLength(position);
throw;
}
return(true);
}
}
public async Task <Components.IFileInfo> FetchFile(string filename, CancellationToken cancellationToken)
{
if (string.IsNullOrEmpty(filename))
{
return(null);
}
var stream = await _errorHandler.HandleErrors(
() => FetchStream(filename, cancellationToken),
filename,
cancellationToken);
if (stream == null)
{
return(null);
}
return(new GridFSFileInfo(stream, _bucket, _errorHandler));
}
public Task <bool> CopyTo(Stream stream, CancellationToken cancellationToken)
=> stream?.CanSeek == true
? _errorHandler.HandleErrors(() => CopyToImpl(stream, cancellationToken), Filename, cancellationToken)
: CopyToImpl(stream, cancellationToken);