public DownloadOperationResult(DownloadOperationResult operationResult)
{
Status = operationResult.Status;
Exception = operationResult.Exception;
}
protected override DownloadOperationResult OnDownloadFile(string url, FileInfo fileInfo, long size, Action <long> progressReporter,
CancellationToken cancellationToken, List <string> hostList = null)
{
var destPath = fileInfo.FullName;
// WHEN DOWNLOAD IS PAUSED/CANCELED, REMAINING FILES STILL RUN THROUGH HERE, SO TRY TO SKIP IT ASAP.
if (cancellationToken.IsCancellationRequested)
{
return(DownloadStatus.Cancelled);
}
// PREPARE DESTINATION FOLDER
try
{
var folder = fileInfo.DirectoryName;
if (folder != null && !Directory.Exists(folder))
{
Directory.CreateDirectory(folder);
}
}
catch (Exception exc)
{
Logger.GetInstance(typeof(FileDownloader)).Error($"Unable to create directory: {destPath} ex: {exc}");
return(DownloadErrorToOperationResult(exc, cancellationToken));
}
// PREPARE MULTIPLE HOSTS
if (hostList == null || hostList.Count == 0)
{
try
{
hostList = new List <string> {
new Uri(url).GetLeftPart(UriPartial.Authority)
};
}
catch (Exception exc)
{
Logger.GetInstance(typeof(FileDownloader)).Error($"Url is incorrect. url: {url} Exception: {exc}");
return(DownloadStatus.InternalError);
}
}
var multipleHostHelper = new MultipleHostHelper(hostList, DownloadConfig.MaxRetryCountPerHost);
var trial = 0;
var fileUrl = string.Empty;
long progressSize = 0;
DownloadOperationResult retStatus = DownloadStatus.Unknown;
while (true)
{
try
{
if (cancellationToken.IsCancellationRequested)
{
return(DownloadStatus.Cancelled);
}
if (retStatus?.Status == DownloadStatus.OutOfFreeSpaceError ||
(retStatus?.Status == DownloadStatus.ServerConnectionError &&
!NetworkInterface.IsInternetAvailable()))
{
var errorMsg = retStatus?.Status == DownloadStatus.OutOfFreeSpaceError ? "Disk full error." : "No internet error.";
Logger.GetInstance(typeof(FileDownloader)).Error($"{errorMsg} File: {destPath} Trial: {trial}");
return(retStatus);
}
fileUrl = multipleHostHelper.GetNextUrl(url);
if (string.IsNullOrEmpty(fileUrl))
{
Logger.GetInstance(typeof(FileDownloader)).Error(
$"No more host to try. File: {destPath} Trial: {trial} Last error: {retStatus.Status} Last exception: {retStatus.Exception}");
return(retStatus.Success ? DownloadStatus.InternalError : retStatus);
}
progressSize = 0;
trial++;
Logger.GetInstance(typeof(FileDownloader)).Info($"Trial #{trial} started. File: {destPath} Size: {size} FileUrl: {fileUrl}");
using (var httpRequestMessage = new HttpRequestMessage(HttpMethod.Get, fileUrl))
{
using (var responseMessage = HttpClientInstance.SendAsync(
httpRequestMessage, HttpCompletionOption.ResponseHeadersRead, cancellationToken).Result)
{
if (cancellationToken.IsCancellationRequested)
{
return(DownloadStatus.Cancelled);
}
if (!responseMessage.IsSuccessStatusCode)
{
throw new HttpStatusErrorException(responseMessage.StatusCode,
$"Server response error. HttpStatusCode: {responseMessage.StatusCode} Url: {fileUrl}");
}
using (var urlStream = responseMessage.Content.ReadAsStreamAsync().Result)
{
using (var fileStream = new FileStream(destPath, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
IProgress <long> progress = new SynchronousProgress <long>(value =>
{
progressSize += value;
progressReporter(value);
});
StreamCopyTo(urlStream, fileStream, progress, cancellationToken,
DownloadConfig.SleepPerBufferDownloadedInMilli, DownloadConfig.StreamBufferSize);
}
}
}
}
if (cancellationToken.IsCancellationRequested)
{
return(DownloadStatus.Cancelled);
}
if (retStatus != null && retStatus.Cancel)
{
return(DownloadStatus.Cancelled);
}
Logger.GetInstance(typeof(FileDownloader)).Info($"File downloaded. File: {destPath} Size: {size} Trial: {trial}");
return(DownloadStatus.Success);
}
catch (Exception exc)
{
if (cancellationToken.IsCancellationRequested)
{
return(DownloadStatus.Cancelled);
}
retStatus = DownloadErrorToOperationResult(exc, cancellationToken);
progressReporter(progressSize * -1);
Logger.GetInstance(typeof(FileDownloader)).Error(
$"Exception. FileName: {destPath} Size: {size} FileUrl: {fileUrl} Trial: {trial} Error: {retStatus.Status} Exception: {exc}.");
}
}
}
