internal FtpSessionConnected(FtpClient h, FtpControlChannel ctrl, bool caseInsensitive)
{
m_host = h;
m_ctrlChannel = ctrl;
m_ctrlChannel.Session = this;
m_caseInsensitive = caseInsensitive;
}
internal FtpControlChannel(FtpClient host)
{
m_connection = new TcpClient();
m_server = "localhost";
m_port = 21;
m_sessionHost = host;
m_currentTransferMode = TransferMode.Unknown;
}
private void ReplicateToHadoop(FtpClient ftpClient, string replicationFolder, DataTable replicationLog)
{
WriteTrace("Replicating folder '{0}'", FilePath.TrimFileName(replicationFolder, FilePathTrimLength));
// Create list of files to be replicated.
List<string> files = new List<string>(Directory.GetFiles(replicationFolder, "*_to_*.d", SearchOption.AllDirectories));
files.Sort();
// Process all the files in the list.
WriteTrace("Found {0} files in folder", files.Count);
foreach (string file in files)
{
// Initialize local variables.
int requests = int.MinValue;
bool uploading = false;
double hashingStartTime = double.MinValue;
double hashingTotalTime = double.MinValue;
double transferStartTime = double.MinValue;
double transferTotalTime = double.MinValue;
string justFileName = FilePath.GetFileName(file);
DataRow record = null;
DataRow[] filter = replicationLog.Select(string.Format("FileName ='{0}'", justFileName));
FileInfo fileInfo = new FileInfo(file);
WriteTrace("Replicating file '{0}' of size {1:0,0} KB", FilePath.TrimFileName(file, FilePathTrimLength), Convert.ToInt32(fileInfo.Length / 1024D));
try
{
// Continue to "ping" FTP server so that it knows we are alive and well
ftpClient.ControlChannel.Command("NOOP");
// Compute HDFS file hash.
WriteTrace("Hashing file");
hashingStartTime = Common.SystemTimer;
byte[] localHash = ComputeHdfsFileHash(file, m_bytesPerCrc32, m_hdfsBlockSize, m_applyBufferPadding);
hashingTotalTime = Common.SystemTimer - hashingStartTime;
WriteTrace("File hashed in {0} seconds", Convert.ToInt32(hashingTotalTime));
// Check if file is to be uploaded.
if (filter.Length == 0 ||
filter[0]["FileSync"].ToString() == "Fail" ||
localHash.CompareTo(ByteEncoding.Hexadecimal.GetBytes(filter[0]["FileHash"].ToString())) != 0)
{
// Upload file to HDFS since:
// 1) File has not been replicated previously.
// OR
// 2) File has been replicated in the past, but its content has changed since then.
uploading = true;
WriteTrace("Uploading file");
transferStartTime = Common.SystemTimer;
ftpClient.CurrentDirectory.PutFile(file);
transferTotalTime = Common.SystemTimer - transferStartTime;
WriteTrace("File uploaded in {0} seconds", Convert.ToInt32(transferTotalTime));
// Request file hash from HDFS.
for (requests = 1; requests <= m_hashRequestAttempts; requests++)
{
try
{
// Wait before request.
WriteTrace("Waiting {0} seconds before HDFS hash request", m_hashRequestWaitTime / 1000);
Thread.Sleep(m_hashRequestWaitTime);
// Request file hash.
WriteTrace("Requesting HDFS hash (Attempt {0})", requests);
ftpClient.ControlChannel.Command(string.Format("HDFSCHKSM {0}{1}", ftpClient.CurrentDirectory.FullPath, justFileName));
WriteTrace("Hash request response - {0}", ftpClient.ControlChannel.LastResponse.Message.RemoveCrLfs());
// Exit when successful.
if (ftpClient.ControlChannel.LastResponse.Code == 200)
break;
}
catch (Exception ex)
{
// Try again - Apache MINA FTP server acts funny with updoad & hash check of large files.
WriteTrace("Hash request error - {0}", ex.Message);
}
}
// Initialize replication log entry.
if (filter.Length > 0)
{
record = filter[0];
}
else
{
record = replicationLog.NewRow();
replicationLog.Rows.Add(record);
}
// Update replication log entry.
record["DateTime"] = DateTime.UtcNow;
record["FileName"] = justFileName;
record["FileHash"] = ByteEncoding.Hexadecimal.GetString(localHash);
record["HashingTime"] = hashingTotalTime.ToString("0.000");
record["TransferTime"] = transferTotalTime.ToString("0.000");
record["TransferRate"] = ((new FileInfo(file).Length / SI2.Kilo) / transferTotalTime).ToString("0.00");
record["ServerRequests"] = requests < m_hashRequestAttempts ? requests : m_hashRequestAttempts;
record["ServerResponse"] = ftpClient.ControlChannel.LastResponse.Message.RemoveCrLfs();
// Compare local and HDFS hash.
if (ftpClient.ControlChannel.LastResponse.Code == 200 &&
localHash.CompareTo(ByteEncoding.Hexadecimal.GetBytes(ftpClient.ControlChannel.LastResponse.Message.RemoveCrLfs().Split(':')[1])) == 0)
{
// File uploaded and hashes match.
record["FileSync"] = "Pass";
WriteTrace("Replication successful");
// Deleted original file after replication.
if (m_deleteOriginalFiles)
DeleteOriginalFile(file, fileInfo);
// Notify about the successful replication.
OnReplicationProgress(new ProcessProgress<int>("ReplicateArchive", justFileName, 1, 1));
}
else
{
// Hashes are different - possible causes:
// 1) Local file got modified after hash was computed locally.
// OR
// 2) Local and remote hashing algorithms are not the same.
record["FileSync"] = "Fail";
WriteTrace("Replication unsuccessful");
throw new InvalidDataException("File hash mismatch");
}
// Write replication entry to the log file.
WriteTrace("Updating replication log file");
replicationLog.WriteXml(FilePath.GetAbsolutePath(ReplicationLogFile));
WriteTrace("Replication log file updated");
}
else
{
WriteTrace("Replication skipped - file content unchanged");
// Deleted original file if skipped previously.
if (m_deleteOriginalFiles)
DeleteOriginalFile(file, fileInfo);
}
}
catch (Exception ex)
{
WriteTrace("Replication error - {0}", ex.Message);
// Delete file from FTP site if an exception is encountered when processing the file.
try
{
if (uploading && ftpClient.IsConnected)
{
WriteTrace("Deleting partial upload");
ftpClient.CurrentDirectory.RemoveFile(justFileName);
WriteTrace("Partial upload deleted");
}
}
catch (Exception exDelete)
{
WriteTrace("Delete error - {0}", exDelete.Message);
}
if (ex is ThreadAbortException)
// Re-throw the encountered exception.
throw;
else
// Notify about the encountered exception.
OnReplicationException(ex);
}
}
WriteTrace("Folder '{0}' replicated", FilePath.TrimFileName(replicationFolder, FilePathTrimLength));
}
/// <summary>
/// Replicates the <see cref="TVA.Historian.IArchive"/>.
/// </summary>
protected override void ReplicateArchive()
{
WriteTrace("Archive replication started");
// Parse FTP client information.
Uri replicaUri = new Uri(ReplicaLocation);
string[] credentials = replicaUri.UserInfo.Split(':');
// Ensure credentials are supplied.
if (credentials.Length != 2)
throw new ArgumentException("FTP credentials are missing in ReplicaLocation.");
// Create FTP client for uploading.
FtpClient ftpClient = new FtpClient();
ftpClient.Server = replicaUri.Host;
ftpClient.Port = replicaUri.Port;
ftpClient.FileTransferProgress += FtpClient_FileTransferProgress;
// Initialize the replication log.
WriteTrace("Initializing archive replication log");
DataTable replicationLog = new DataTable("ReplicationRecord");
replicationLog.Columns.Add("DateTime");
replicationLog.Columns.Add("FileName");
replicationLog.Columns.Add("FileHash");
replicationLog.Columns.Add("FileSync");
replicationLog.Columns.Add("HashingTime");
replicationLog.Columns.Add("TransferTime");
replicationLog.Columns.Add("TransferRate");
replicationLog.Columns.Add("ServerRequests");
replicationLog.Columns.Add("ServerResponse");
if (File.Exists(FilePath.GetAbsolutePath(ReplicationLogFile)))
replicationLog.ReadXml(FilePath.GetAbsolutePath(ReplicationLogFile));
WriteTrace("Archive replication log initialized");
try
{
// Connect FTP client to server.
WriteTrace("Connecting to ftp://{0}:{1}", ftpClient.Server, ftpClient.Port);
ftpClient.Connect(credentials[0], credentials[1]);
WriteTrace("Connection successful");
WriteTrace("Changing current directory to '{0}'", replicaUri.AbsolutePath);
ftpClient.SetCurrentDirectory(replicaUri.LocalPath);
WriteTrace("Current directory changed to '{0}'", ftpClient.CurrentDirectory.FullPath);
// Process all archive location(s).
foreach (string folder in ArchiveLocation.Split(';'))
{
if (!string.IsNullOrEmpty(folder))
ReplicateToHadoop(ftpClient, folder.Trim(), replicationLog);
}
}
finally
{
ftpClient.Dispose();
replicationLog.WriteXml(FilePath.GetAbsolutePath(ReplicationLogFile));
}
WriteTrace("Archive replication complete");
}
/// <summary>
/// Releases the unmanaged resources used by the <see cref="FtpSessionDisconnected"/> object and optionally releases the managed resources.
/// </summary>
/// <param name="disposing">true to release both managed and unmanaged resources; false to release only unmanaged resources.</param>
protected virtual void Dispose(bool disposing)
{
if (!m_disposed)
{
try
{
if (disposing)
m_host = null;
}
finally
{
m_disposed = true; // Prevent duplicate dispose.
}
}
}
internal FtpSessionDisconnected(FtpClient h, bool caseInsensitive)
{
m_port = 21;
m_host = h;
m_caseInsensitive = caseInsensitive;
}
/// <summary>
/// Releases the unmanaged resources used by the <see cref="FtpSessionConnected"/> object and optionally releases the managed resources.
/// </summary>
/// <param name="disposing">true to release both managed and unmanaged resources; false to release only unmanaged resources.</param>
protected virtual void Dispose(bool disposing)
{
if (!m_disposed)
{
try
{
// This will be done regardless of whether the object is finalized or disposed.
if (disposing)
{
m_host = null;
m_root = null;
m_current = null;
if (m_ctrlChannel != null)
m_ctrlChannel.Close();
m_ctrlChannel = null;
if (m_dataStream != null)
m_dataStream.Dispose();
m_dataStream = null;
}
}
finally
{
m_disposed = true; // Prevent duplicate dispose.
}
}
}
/// <summary>
/// Clones FTP session used by file watcher so it can be used for other purposes.
/// </summary>
/// <returns>New connected FTP session matching settings defined for FTP file watcher.</returns>
public virtual FtpClient CloneFtpSession()
{
// This method is just for convenience. We can't allow the end user to use the
// actual internal directory for sending files or other work because it is
// constantly being refreshed/used etc., so we instead create a new FTP Session
// based on the current internal session and watch directory information
FtpClient newSession = new FtpClient(m_session.CaseInsensitive);
newSession.Server = m_session.Server;
newSession.Connect(m_username, m_password);
newSession.SetCurrentDirectory(m_watchDirectory);
return newSession;
}
/// <summary>
/// Releases the unmanaged resources used by the <see cref="FtpFileWatcher"/> object and optionally releases the managed resources.
/// </summary>
/// <param name="disposing">true to release both managed and unmanaged resources; false to release only unmanaged resources.</param>
protected override void Dispose(bool disposing)
{
try
{
if (!m_disposed)
{
if (disposing)
{
Close();
if (m_session != null)
{
m_session.CommandSent -= OnCommandSent;
m_session.ResponseReceived -= OnResponseReceived;
m_session.Dispose();
}
m_session = null;
if (m_watchTimer != null)
{
m_watchTimer.Elapsed -= WatchTimer_Elapsed;
m_watchTimer.Dispose();
}
m_watchTimer = null;
if (m_restartTimer != null)
{
m_restartTimer.Elapsed -= RestartTimer_Elapsed;
m_restartTimer.Dispose();
}
m_restartTimer = null;
}
}
m_disposed = true;
}
finally
{
base.Dispose(disposing);
}
}
/// <summary>
/// Constructs a new FTP file watcher using the default settings.
/// </summary>
public FtpFileWatcher()
: base()
{
m_enabled = true;
m_notifyOnComplete = true;
m_currentFiles = new List<FtpFile>();
m_newFiles = new List<FtpFile>();
m_session = new FtpClient(false);
m_session.CommandSent += OnCommandSent;
m_session.ResponseReceived += OnResponseReceived;
// Define a timer to watch for new files
m_watchTimer = new System.Timers.Timer();
m_watchTimer.Elapsed += WatchTimer_Elapsed;
m_watchTimer.AutoReset = false;
m_watchTimer.Interval = 5000;
m_watchTimer.Enabled = false;
// Define a timer for FTP connection in case of availability failures
m_restartTimer = new System.Timers.Timer();
m_restartTimer.Elapsed += RestartTimer_Elapsed;
m_restartTimer.AutoReset = false;
m_restartTimer.Interval = 10000;
m_restartTimer.Enabled = false;
}
