public ProgressEventArgs(ProgressStatistic progressStatistic)
{
if (progressStatistic == null)
{
throw new ArgumentNullException(nameof(progressStatistic));
}
ProgressStatistic = progressStatistic;
}
public DownloadedEventArgs(DownloadedFile file, ProgressStatistic stats = null)
{
File = file;
ProgressStatistics = stats;
}
public bool DownloadFile(FtpListItem file)
{
var filePath = _settings.TempDownloadPath + file.Name;
try
{
var fileExists = File.Exists(filePath);
var stats = new ProgressStatistic
{
CurrentBytesSampleCount = 50
};
stats.ProgressChanged += OnProgressUpdated;
stats.Finished += OnProgressUpdated;
if (!_client.FileExists(file.FullName))
{
Log.Warn($"Attempted to download {file.Name}, but it no longer exists on the server.");
DownloadError(new DownloadedEventArgs(new DownloadedFile {DownloadLocation = filePath, FtpListItem = file}));
return false;
}
DownloadStarted(new DownloadedEventArgs(new DownloadedFile { DownloadLocation = filePath, FtpListItem = file }, stats));
using (var local = new FileStream(filePath, fileExists ? FileMode.Append : FileMode.Create))
{
using (var stream = _client.OpenRead(file.FullName, local.Position))
{
var args = new CopyFromArguments(stats.ProgressChange, new TimeSpan(0, 0, 1), stream.Length);
Log.Info($"{(fileExists ? "Resuming" : "Downloading")} {file.Name}");
local.CopyFrom(stream, args);
}
if (local.Length != file.Size)
{
throw new Exception("File reported as download, but is not complete.");
}
}
Log.Info("Completed " + file.Name);
DownloadComplete(new DownloadedEventArgs(new DownloadedFile {DownloadLocation = filePath, FtpListItem = file}, stats));
return true;
}
catch (FtpException e)
{
DownloadError(new DownloadedEventArgs(new DownloadedFile { DownloadLocation = filePath, FtpListItem = file }));
Log.Error("FTP error with " + file.Name);
Log.Error(e.Message);
TrackErrorCount(file);
return false;
}
catch (NotSupportedException)
{
//The file exists, but doesn't support seeking to the end for resume.
//Delete the existing file and try again from scratch.
File.Delete(filePath);
return DownloadFile(file);
}
catch (Exception e)
{
DownloadError(new DownloadedEventArgs(new DownloadedFile { DownloadLocation = filePath, FtpListItem = file }));
Log.Error("Error with " + file.Name);
Log.Error(e.Message);
TrackErrorCount(file);
return false;
}
}
