/// <summary>
/// Downloads a file from a specified Internet address.
/// </summary>
/// <param name="remotePath">Internet address of the file to download.</param>
/// <param name="localPath">Local file name where to store the content of the download, if null a temporary file name will be generated.</param>
/// <param name="timeOut">Duration in miliseconds before cancelling the operation.</param>
/// <param name="progress">Report the progress of the download</param>
/// <param name="ct">Cancellation token</param>
public static async Task <Tuple <string, string, Exception> > DownloadFileTaskAsync(string remotePath,
string localPath = null, int timeOut = int.MaxValue, IProgress <long> progress = null, CancellationTokenSource ct = null)
{
var watch = Stopwatch.StartNew();
try
{
if (remotePath == null)
{
Logger.Debug("DownloadFileTaskAsync (null remote path): skipping");
throw new ArgumentNullException(nameof(remotePath));
}
if (localPath == null)
{
Logger.Debug(
$"DownloadFileTaskAsync (null local path): generating a temporary file name for {remotePath}");
localPath = Path.GetTempFileName();
}
if (File.Exists(localPath))
{
var fileInfo = new FileInfo(localPath).Length;
if (fileInfo != 0)
{
return(new Tuple <string, string, Exception>(remotePath, localPath, null));
}
}
var direcory = Path.GetDirectoryName(localPath);
if (!string.IsNullOrEmpty(direcory) && !Directory.Exists(direcory))
{
Directory.CreateDirectory(direcory);
}
using (var client = new NoKeepAliveWebClient())
{
if (progress != null)
{
client.DownloadProgressChanged += delegate(object sender, DownloadProgressChangedEventArgs e)
{
progress.Report(e.BytesReceived / e.TotalBytesToReceive);
};
}
TimerCallback timerCallback = c =>
{
var webClient = (WebClient)c;
if (!webClient.IsBusy)
{
return;
}
webClient.CancelAsync();
Logger.Debug($"DownloadFileTaskAsync (time out due): {remotePath}");
};
try
{
using (new Timer(timerCallback, client, timeOut, Timeout.Infinite))
{
if (ct != null)
{
await client.DownloadFileTaskAsync(remotePath, localPath, ct.Token);
}
else
{
await client.DownloadFileTaskAsync(remotePath, localPath);
}
}
}
catch (Exception exception) when(exception is TaskCanceledException)
{
watch.Stop();
Logger.Debug(
"DownloadFileTaskAsync cancelled.");
return(new Tuple <string, string, Exception>(remotePath, null, exception));
}
catch (ObjectDisposedException exception)
{
watch.Stop();
Logger.Info(
$"DownloadFileTaskAsync (can't cancel download, it has finished previously): {remotePath}");
return(new Tuple <string, string, Exception>(remotePath, null, exception));
}
catch (WebException exception)
{
watch.Stop();
Logger.Error($"DownloadFileTaskAsync: {exception.Message}");
return(new Tuple <string, string, Exception>(remotePath, null, exception));
}
}
}
catch (Exception ex)
{
watch.Stop();
Logger.Error(
$"DownloadFileTaskAsync (download failed): {remotePath} Additional informations : {ex.Message}");
return(new Tuple <string, string, Exception>(remotePath, null, ex));
}
finally
{
watch.Stop();
var elapsedMs = watch.ElapsedMilliseconds;
Logger.Debug($"DownloadFileTaskAsync (downloaded in {elapsedMs} ms): {remotePath}");
}
return(new Tuple <string, string, Exception>(remotePath, localPath, null));
}
/// <summary>
/// Downloads a file from a specified Internet address.
/// </summary>
/// <param name="remotePath">Internet address of the file to download.</param>
/// <param name="localPath">Local file name where to store the content of the download, if null a temporary file name will be generated.</param>
/// <param name="timeOut">Duration in miliseconds before cancelling the operation.</param>
/// <param name="progress">Report the progress of the download</param>
/// <param name="ct">Cancellation token</param>
public static async Task<Tuple<string, string, Exception>> DownloadFileTaskAsync(string remotePath,
string localPath = null, int timeOut = 10000, IProgress<long> progress = null, CancellationTokenSource ct = null)
{
try
{
var watch = Stopwatch.StartNew();
if (remotePath == null)
{
Logger.Debug("DownloadFileTaskAsync (null remote path): skipping");
throw new ArgumentNullException(nameof(remotePath));
}
if (localPath == null)
{
Logger.Debug(
$"DownloadFileTaskAsync (null local path): generating a temporary file name for {remotePath}");
localPath = Path.GetTempFileName();
}
if (File.Exists(localPath))
{
var fileInfo = new FileInfo(localPath).Length;
if (fileInfo != 0)
{
return new Tuple<string, string, Exception>(remotePath, localPath, null);
}
}
var direcory = Path.GetDirectoryName(localPath);
if (!string.IsNullOrEmpty(direcory) && !Directory.Exists(direcory))
{
Directory.CreateDirectory(direcory);
}
using (var client = new NoKeepAliveWebClient())
{
if (progress != null)
{
client.DownloadProgressChanged += delegate(object sender, DownloadProgressChangedEventArgs e)
{
progress.Report(e.BytesReceived/e.TotalBytesToReceive);
};
}
TimerCallback timerCallback = c =>
{
var webClient = (WebClient) c;
if (!webClient.IsBusy) return;
webClient.CancelAsync();
Logger.Debug($"DownloadFileTaskAsync (time out due): {remotePath}");
};
try
{
using (ct?.Token.Register(() => client.CancelAsync()))
using (new Timer(timerCallback, client, timeOut, Timeout.Infinite))
{
await client.DownloadFileTaskAsync(remotePath, localPath);
}
}
catch (ObjectDisposedException)
{
//TODO:Manage the disposed client when cancel async
}
watch.Stop();
var elapsedMs = watch.ElapsedMilliseconds;
Logger.Debug($"DownloadFileTaskAsync (downloaded in {elapsedMs} ms): {remotePath}");
return new Tuple<string, string, Exception>(remotePath, localPath, null);
}
}
catch (Exception ex)
{
Logger.Error(
$"DownloadFileTaskAsync (download failed): {remotePath} Additional informations : {ex.Message}");
return new Tuple<string, string, Exception>(remotePath, null, ex);
}
}
