private void BeforeFileDownload(UpdateFile file)
{
//Create any parent directories for this file
var dir = Path.GetDirectoryName(file.Path);
if (!string.IsNullOrEmpty(dir) && !Directory.Exists(dir))
{
Directory.CreateDirectory(dir);
}
}
private void AddToUpdateList(UpdateFile file, List <UpdateFile> downloadFirst)
{
if (IsUpdaterFile(file.Path.ToLower()))
{
downloadFirst.Add(file);
}
else
{
mDownloadQueue.Push(file);
}
}
private void CheckFileData(UpdateFile file, byte[] fileData)
{
if (fileData.Length != file.Size)
{
throw new Exception("[File Length Mismatch - Got " + fileData.Length + " bytes, Expected " + file.Size + "]");
}
//Check MD5
var md5Hash = "";
using (var md5 = MD5.Create())
{
using (var stream = new MemoryStream(fileData))
{
md5Hash = BitConverter.ToString(md5.ComputeHash(stream)).Replace("-", "").ToLowerInvariant();
}
}
if (md5Hash != file.Hash)
{
throw new Exception("File Hash Mismatch");
}
}
private void BeforeReplaceFile(UpdateFile file)
{
//Delete .old first if exists
if (File.Exists(file.Path + ".old"))
{
try
{
File.Delete(file.Path + ".old");
}
catch { }
}
//Delete Existing File
if (File.Exists(file.Path))
{
try
{
File.Delete(file.Path);
}
catch
{
try
{
File.Move(file.Path, file.Path + ".old");
}
catch
{
throw new Exception("Failed to delete or move existing file!");
}
}
}
if (file.Path == Path.GetFileName(Assembly.GetEntryAssembly().Location))
{
ReplacedSelf = true;
}
}
private async void DownloadUpdates()
{
while (mDownloadQueue.Count > 0 && !mFailed)
{
UpdateFile file = null;
var streamDl = false;
lock (mUpdate)
{
if (mDownloadQueue.TryPop(out file))
{
mActiveDownloads.TryAdd(file, 0);
}
}
if (file != null)
{
//Download File
BeforeFileDownload(file);
try
{
//Use WebClient to Download File To Memory
var wc = new WebClient();
wc.DownloadProgressChanged += ((sender, args) => mActiveDownloads[file] = args.BytesReceived);
var rawUri = mBaseUrl +
"/" +
Uri.EscapeUriString(file.Path) +
"?token=" +
Environment.TickCount;
var fileUri = new Uri(rawUri);
var fileData = await wc.DownloadDataTaskAsync(fileUri);
wc.Dispose();
CheckFileData(file, fileData);
BeforeReplaceFile(file);
//Save New File
File.WriteAllBytes(file.Path, fileData);
lock (mUpdate)
{
mCompletedDownloads.Add(file);
mActiveDownloads.TryRemove(file, out long val);
mDownloadedBytes += file.Size;
if (IsUpdaterFile(file.Path))
{
mUpdaterContentLoaded = true;
}
}
}
catch (Exception ex)
{
lock (mUpdate)
{
mActiveDownloads.TryRemove(file, out long val);
if (mFailedDownloads.ContainsKey(file))
{
mFailedDownloads[file]++;
}
else
{
mFailedDownloads.TryAdd(file, 1);
}
if (mFailedDownloads[file] > 2)
{
Exception = new Exception("[" + file.Path + "] - " + ex.Message, ex);
mFailed = true;
}
else
{
mDownloadQueue.Push(file);
}
}
}
}
Thread.Sleep(10);
}
}
