public DownloadProgress(PendingResponse pr)
{
transferID = pr.transferID;
mac = pr.uploader;
hash = pr.fileHash;
fileName = pr.fileName;
symKey = pr.symKey;
fileSize = pr.fileSize;
type = pr.type;
nick = pr.nick;
averageTransferRate = 0;
isComplete = false;
isFailed = false;
isHashMismatch = false;
attempts = 0;
if (pr.type == "secondleg" || pr.type == "direct")
{
downloadedFilePath = Configuration.downloadFolder + "\\" + pr.fileName;
visible = true;
}
else
{
downloadedFilePath = Utils.getAppDataPath(@"\Bounces\" + pr.fileHash + ".bounce");
visible = false;
}
bytesDownloaded = 0;
status = "Starting..";
}
public static string postDownload(DownloadProgress dp, PendingResponse pr, BackgroundWorker worker)
{
int percentComplete = (int)(100 * dp.bytesDownloaded / pr.fileSize);
if (dp.isFailed)
{
dp.attempts = dp.attempts + 1;
if (dp.attempts > 10)
{
dp.status = "Failed";
dp.isFailedUnrecoverably = true;
worker.ReportProgress(percentComplete, dp);
return(null);
}
dp.status = "Retrying.. (" + dp.attempts + ")";
dp.isFailed = false;
worker.ReportProgress(percentComplete, dp);
System.Threading.Thread.Sleep(3000);
return("FAILED");
}
BackgroundWorker updateWorker = new BackgroundWorker();
updateWorker.DoWork += Downloads.updateWorker_DoWork;
updateWorker.RunWorkerCompleted += Downloads.updateWorker_RunWorkerCompleted;
// Set update parameters
UpdateRequest updateRequest = new UpdateRequest();
updateRequest.transferID = dp.transferID;
updateRequest.uploader = dp.mac;
if (dp.isCanceled)
{
try
{ File.Delete(dp.downloadedFilePath); }
catch (Exception e2)
{ } // Do nothing. We only want to try and delete the file.
// Remove from pendingToDownload
DownloadProgress temp = null;
pendingToDownload.TryRemove(pr, out temp);
updateRequest.newHash = dp.hash;
updateRequest.status = "canceled";
updateWorker.RunWorkerAsync(updateRequest);
return(null);
}
// Download neither canceled nor failed
String newHash = Indexer.GenerateHash(dp.downloadedFilePath);
if (dp.type == "secondleg" || dp.type == "direct")
{
if (newHash == dp.hash)
{
Utils.writeLog("download: Hash verified");
dp.isComplete = true;
dp.status = "Completed";
worker.ReportProgress(100, dp);
// Removing from partially-downloaded-files list
Settings.Default.partiallyDownloadedFiles.Replace(dp.downloadedFilePath + "; ", "");
}
else
{
Utils.writeLog("download: Hash verification failed");
dp.status = "Failed integrity check";
dp.isHashMismatch = true;
dp.isFailed = true;
dp.isFailedUnrecoverably = true;
worker.ReportProgress(100, dp);
try
{ File.Delete(dp.downloadedFilePath); }
catch (Exception e2)
{ } // Do nothing. We only want to try and delete the file.
}
updateRequest.newHash = newHash;
updateRequest.status = "done";
updateWorker.RunWorkerAsync(updateRequest);
return(newHash);
}
if (dp.type == "firstleg")
{
// Rename the file to the new hash
String newPath = dp.downloadedFilePath.Substring(0, dp.downloadedFilePath.LastIndexOf(@"\"));
newPath = newPath + "\\" + newHash + ".bounced";
// Removing from partially-downloaded-files list
Settings.Default.partiallyDownloadedFiles.Replace(dp.downloadedFilePath + "; ", "");
try
{
File.Move(dp.downloadedFilePath, newPath);
}
catch (Exception e)
{
Utils.writeLog("download: Critical. Unable to rename file to the new hash.");
}
dp.status = "Completed";
dp.isComplete = true;
worker.ReportProgress(100, dp);
}
updateRequest.newHash = newHash;
updateRequest.status = "done";
updateWorker.RunWorkerAsync(updateRequest);
return(newHash);
}
public static string download(BackgroundWorker worker, PendingResponse pr, DownloadProgress dp, long startByte)
{
TcpClient tcpClient = new TcpClient();
NetworkStream clientStream = null;
try
{
tcpClient.Connect(pr.uploaderIP, 8002);
clientStream = tcpClient.GetStream();
Utils.writeLog("download: Sending download instruction to peer " + pr.uploaderIP + "...");
//Format: fileHash | transfer ID | transfer-type
Utils.writeLog("tid is " + pr.transferID);
ASCIIEncoding encoder = new ASCIIEncoding();
byte[] buffer = encoder.GetBytes(pr.fileHash + "|" + pr.transferID + "|" + pr.type + "|" + startByte);
clientStream.Write(buffer, 0, buffer.Length);
clientStream.Flush();
Utils.writeLog("download: Download started.");
}
catch (Exception e)
{
Utils.writeLog("download: Could not establish connection. Error : " + e);
dp.isFailed = true;
return(postDownload(dp, pr, worker));
}
// Begin file transfer
FileStream strLocal = null;
Downloads.currentDownloads.Add(dp);
// Add the download to the gridview
worker.ReportProgress(0, dp);
#region initvars
long bytesDownloaded = startByte; //Total bytes downloaded for the file
int bytesSize; //Number of bytes read by the stream reader
int tempTransferRate = 0; //Instantaneous (for 1 refresh cycle) download rate
long downloadedInCycle = 0; //Total bytes downloaded in the last refresh cycle
int percentComplete = 0;
DateTime startTime = DateTime.Now; //To track total download time
DateTime refresh = DateTime.Now; //To track time since last refresh
byte[] downBuffer = new byte[4096];
bool appendToExistingFile = false;
// Find a free filename
if (File.Exists(dp.downloadedFilePath))
{
long existingFileLength = new FileInfo(dp.downloadedFilePath).Length;
// First file found should be appended to
if (startByte > 0 && startByte == existingFileLength)
{
appendToExistingFile = true;
}
else
{
String candidatePath = "";
for (int i = 2; i < 100; i++) // 100 here is arbitrary, just want to make sure it doesnt loop forever
{
candidatePath = dp.downloadedFilePath.Substring(0, dp.downloadedFilePath.LastIndexOf('.'));
candidatePath += " (" + i + ")";
candidatePath += dp.downloadedFilePath.Substring(dp.downloadedFilePath.LastIndexOf('.'));
if (!File.Exists(candidatePath))
{
Utils.writeLog("download: Found free file path " + candidatePath);
dp.downloadedFilePath = candidatePath;
dp.fileName = dp.downloadedFilePath.Substring(dp.downloadedFilePath.LastIndexOf(@"\") + 1);
break;
}
else
{
existingFileLength = new FileInfo(candidatePath).Length;
if (startByte > 0 && startByte == existingFileLength)
{
dp.downloadedFilePath = candidatePath;
appendToExistingFile = true;
break;
}
}
}
}
}
try
{
if (appendToExistingFile)
{
strLocal = new FileStream(dp.downloadedFilePath,
FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
}
else
{
strLocal = new FileStream(dp.downloadedFilePath,
FileMode.Create, FileAccess.Write, FileShare.ReadWrite);
}
}
catch (Exception e)
{
Utils.writeLog("download: Error creating file : " + e);
// Attempt to recover from error that download folder doesn't exist.
String filePath = dp.downloadedFilePath;
String folderPath = filePath.Substring(0, filePath.LastIndexOf("\\"));
try
{
System.IO.Directory.CreateDirectory(folderPath);
strLocal = new FileStream(dp.downloadedFilePath,
FileMode.Create, FileAccess.Write, FileShare.ReadWrite);
}
catch (Exception e2)
{
Utils.writeLog("download: Unrecoverable error while creating folder to hold file");
MessageBox.Show("Could not download file as the download folder could not be found or created",
"Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
return(null);
}
}
Settings.Default.partiallyDownloadedFiles = dp.downloadedFilePath + "; " +
Settings.Default.partiallyDownloadedFiles;
#endregion
try
{
// Perform file transfer.
clientStream.ReadTimeout = 6000; // Need to timeout now to prevent stalled appearance in UI
while ((bytesSize = clientStream.Read(downBuffer, 0, downBuffer.Length)) > 0)
{
// In case user cancels download
if (pendingToDownload[pr] == null || worker.CancellationPending)
{
throw new DownloadCanceledException("Download canceled");
}
downloadedInCycle += bytesSize;
bytesDownloaded = bytesDownloaded + bytesSize;
dp.bytesDownloaded = bytesDownloaded;
strLocal.Write(downBuffer, 0, bytesSize);
if (pr.fileSize != 0)
{
percentComplete = (int)(100 * bytesDownloaded / pr.fileSize);
}
// Report progress to UI at intervals
double msElapsedSinceRefresh = (DateTime.Now - refresh).TotalMilliseconds;
if (msElapsedSinceRefresh > 1000)
{
tempTransferRate = (int)((downloadedInCycle / 1024.0) / (DateTime.Now - refresh).TotalSeconds);
dp.status = "Downloading";
// Initialize download speed
if (dp.averageTransferRate == 0)
{
dp.averageTransferRate = tempTransferRate;
}
// Compute download speed with smoothing factor
dp.transferRate = tempTransferRate;
dp.averageTransferRate = (0.01) * tempTransferRate + (0.99) * dp.averageTransferRate;
worker.ReportProgress(percentComplete, dp);
refresh = DateTime.Now;
downloadedInCycle = 0;
}
}
dp.bytesDownloaded = bytesDownloaded;
dp.transferRate = tempTransferRate;
worker.ReportProgress(100, dp);
Utils.writeLog("download: Completed download of " + pr.fileName +
" (" + dp.fileSize + ") Type:" + dp.type);
dp.status = "Checking file..";
}
catch (DownloadCanceledException dce) // Occurs when user cancels
{
Utils.writeLog("download: Canceled by user");
dp.status = "Canceled";
dp.isCanceled = true;
}
catch (Exception e) // Should only occur due to poor network/peer going offline
{
Utils.writeLog("download: Error:" + e.ToString());
dp.status = "Failed";
dp.isFailed = true;
}
finally
{
worker.ReportProgress(percentComplete, dp);
strLocal.Close();
clientStream.Close();
}
return(postDownload(dp, pr, worker));
}
