static void InitializeNewDownload(FileDownloadInfo fileDownloadInfo)
{
lock (fileDownloadInfo)
{
var find = StorageCachingEngine.Exist(fileDownloadInfo.TableName, fileDownloadInfo.FileId);
if (find != null)
{
FileInfo file = new FileInfo(find.SavePath);
bool isExist = file.Exists;
if (isExist)
{
fileDownloadInfo.FinishAction(FileDownloadStatus.Success, find.SavePath, null);
}
var lastUpdate = fileDownloadInfo.GetLastUpdateFunction();
var dbDate = find.LastUpdateDateTime.AddTicks(-find.LastUpdateDateTime.Ticks % TimeSpan.TicksPerSecond);
lastUpdate = lastUpdate.AddTicks(-lastUpdate.Ticks % TimeSpan.TicksPerSecond);
if (lastUpdate != dbDate || !isExist || file.Length == 0 || !find.IsComplete)
{
Download(fileDownloadInfo, lastUpdate);
}
else
{
Dispose(fileDownloadInfo);
}
}
else
{
var lastUpdate = fileDownloadInfo.GetLastUpdateFunction();
Download(fileDownloadInfo, lastUpdate);
}
}
}
static void Download(FileDownloadInfo fileDownloadInfo, DateTime lastUpdate)
{
bool exceptionWhenDownloading = false;
try
{
var streamAndSize = fileDownloadInfo.GetStreamFunction();
//حواست باشه که در این موارد اگر رید و رایت تداخل بخوره و از طرف دیگه گوشی یا سیستم داره فایل رو میخونه و اینجا داره رایت میشه ممکنه فایل خراب نشون داده بشه یا خطا بخوره
int downloadedSize = 0;
using (var fileStream = new FileStream(fileDownloadInfo.SavePath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite))
{
exceptionWhenDownloading = true;
while (downloadedSize < streamAndSize.FileLength)
{
byte[] bytes = new byte[1024 * 20];
var socketStream = (streamAndSize.Stream as System.Net.Sockets.NetworkStream);
//if (socketStream != null)
//{
// var p = socketStream.GetType().GetProperty("Socket", System.Reflection.BindingFlags.GetProperty | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
// var socket = (System.Net.Sockets.Socket)p.GetValue(socketStream);
// if (!socket.Poll(10000, System.Net.Sockets.SelectMode.SelectRead))
// throw new TimeoutException();
// else if (!socket.Connected)
// throw new Exception("socket closed");
//}
var readCount = streamAndSize.Stream.Read(bytes, 0, bytes.Length);
downloadedSize += readCount;
//if (readCount == 0)
//{
// var p = socketStream.GetType().GetProperty("Socket", System.Reflection.BindingFlags.GetProperty | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
// var socket = (System.Net.Sockets.Socket)p.GetValue(socketStream);
// if (!socket.Poll(10000, System.Net.Sockets.SelectMode.SelectRead))
// throw new TimeoutException();
// else if (!socket.Connected)
// throw new Exception("socket closed");
// while (!socketStream.DataAvailable && socket.Connected)
// {
// Thread.Sleep(1000);
// }
//}
if (readCount <= 0)
{
throw new Exception("read zero client disconnected");
}
fileStream.Write(bytes, 0, readCount);
}
}
lock (DownloadQueues)
{
StorageCachingEngine.AddOrUpdate(fileDownloadInfo.TableName, fileDownloadInfo.FileId, fileDownloadInfo.SavePath, lastUpdate, true);
fileDownloadInfo.FinishAction(FileDownloadStatus.Success, fileDownloadInfo.SavePath, null);
Dispose(fileDownloadInfo);
}
}
catch (Exception ex)
{
lock (DownloadQueues)
{
if (exceptionWhenDownloading && File.Exists(fileDownloadInfo.SavePath))
{
DeleteFile(fileDownloadInfo.SavePath);
}
StorageCachingEngine.Delete(fileDownloadInfo.TableName, fileDownloadInfo.FileId);
fileDownloadInfo.FinishAction(FileDownloadStatus.Error, fileDownloadInfo.SavePath, ex);
Dispose(fileDownloadInfo);
}
}
}
