/// <summary>
/// Gets the user storing the file at recovery time
/// </summary>
/// <param name="nodeName">username for storing user</param>
/*private void GetSource(string nodeName){
* PeerNode source = null;
* action = ActionType.Restore;
*
* if (GetClientEvent != null)
* source = GetClientEvent(nodeName);
* if (source != null){
* SendMessage("LET" + " " + this.IP + " " + this.Name + " " + this.PubKey);
* if(LogEvent != null) LogEvent(source.Name, false, "LET" + " " + this.IP + " " + this.Name + " " + this.PubKey);
* }
* else{
* SendMessage("405");
* if(LogEvent != null) LogEvent(nodeName, false, "405");
* }
* }*/
internal void SendSession(PeerSession session, SessionType type, bool isIndexSession)
{
string action = string.Empty;
MessageContext ctx = MessageContext.Generic;
session.Kind = type;
bool synchronous = false;
if (type == SessionType.Backup)
{
ctx = MessageContext.Task;
action = "ASKSTORAGE";
}
else if (type == SessionType.Store)
{
action = "STORE";
// wait for confirmation that the receive/store session has been started on storage node.
// We avoid client node to connect to a storage node that is not yet ready.
synchronous = true;
}
SendMessage(new NodeMessage {
Context = ctx,
TaskId = session.TaskId,
Action = action,
Data = session.ToJson <PeerSession>(),
Data2 = isIndexSession.ToString(),
Synchroneous = synchronous
});
}
/// <summary>
/// Creates a session for receiving a backup
/// </summary>
/// <param name="cIp">client1 IP</param>
private void StartStoreSession(PeerSession s)
{
this.Status = NodeStatus.Storing;
foreach (Session listeningSess in sessions /*Listen*/)
{
if (listeningSess.Kind == SessionType.Store && listeningSess.FromNode.Id == s.FromNode.Id &&
listeningSess.Id == s.Id)
{
Logger.Append(Severity.DEBUG, "Reusing existing session " + s.Id + " with node #" + s.FromNode.Id + ", " + s.FromNode.Name + " (" + s.FromNode.IP + ":" + ")");
listeningSess.RenewBudget(s.Budget);
return;
}
}
Logger.Append(Severity.DEBUG, "Creating new session to receive data from node #" + s.FromNode.Id + ", " + s.FromNode.Name + " (" + s.FromNode.IP + ":" + ")");
Session client1 = new Session(s, cert);
client1.SessionRemoved += new Node.Session.RemoveSessionHandler(this.RemoveSession);
client1.FileReceivedEvent += new Node.Session.FileReceivedHandler(this.FileReceived);
client1.UpdateStorageEvent += this.SendSessionUpdate;
client1.RenewBudget(s.Budget);
sessions.Add(client1);
try{
StartListeningForClient(client1);
}
catch (Exception e) {
Logger.Append(Severity.WARNING, "Could not accept session with client node #" + s.FromNode.Id + " : " + e.Message);
RemoveSession(client1);
}
}
/*private Session GetCleanSession(int taskId, int nodeId, string nodeIp, int port, string cN, string cK){
* Session cleanSession = null;
* foreach(Session sess in sessionsConnect)
* if(sess.Type == SessionType.Clean && sess.ClientId == nodeId){
* Logger.Append(Severity.DEBUG, "Already have an open cleaning session with storage node "+cN+" ("+nodeIp+":"+port+"), reusing it. ");
* cleanSession = sess;
* }
* if(cleanSession == null){
* cleanSession = new Session(SessionType.Backup, nodeId, nodeIp, port, cN, cK, this.keyPairCrypto);
* //with threadpool, ALT doesnt work (no exceptions propagation between threads)
* ThreadPool.QueueUserWorkItem(cleanSession.ConnectToStorageNode);
* //storageSession.ConnectToStorageNode(null);
* cleanSession.RemoveSessionEvent += new Node.Session.RemoveSessionHandler(this.RemoveSession);
* //storageSession.FileSentEvent += new Node.Session.FileSentHandler(this.ChunkSent); //, bsId, chunkName, nodeId);
* cleanSession.FileReceivedEvent += new Node.Session.FileReceivedHandler(this.FileReceived);
* sessionsConnect.Add(cleanSession);
* cleanSession.AuthenticatedAndReadyEvent.WaitOne();
* }
* return cleanSession;
* }*/
private Session GetStorageSession(PeerSession s)
{
Session storageSession = null;
foreach (Session sess in sessions)
{
if (sess.Kind == SessionType.Backup && sess.Id == s.Id)
{
Logger.Append(Severity.DEBUG, "Reusing open session #" + s.Id + " with storage node #" + s.ToNode.Id + " (" + s.ToNode.IP + ":" + s.ToNode.ListenPort + "), reusing it. ");
storageSession = sess;
storageSession.RenewBudget(s.Budget);
}
}
if (storageSession == null)
{
storageSession = new Session(s, cert);
storageSession.Connect();
storageSession.SessionRemoved += new Node.Session.RemoveSessionHandler(this.RemoveSession);
//storageSession.FileSentEvent += new Node.Session.FileSentHandler(this.ChunkSent); //, bsId, chunkName, nodeId);
storageSession.FileReceivedEvent += new Node.Session.FileReceivedHandler(this.FileReceived);
if (storageSession.AuthenticatedEvent.WaitOne(new TimeSpan(0, 0, 30)))
{
sessions.Add(storageSession);
}
else
{
throw new TimeoutException("Didn't receive handshake confirmation in time for session with peer #" + s.ToNode.Id);
}
}
//if(SessionReady != null) SessionReady(storageSession);
return(storageSession);
}
public static async Task MainAsync(string[] args)
{
Options options = Argument.Parse <Options>(args);
if (options.IsValid())
{
FileHash hash = FileHash.Parse(options.Hash);
NetworkAddress address = new NetworkAddress(options.Host, Int32.Parse(options.Port));
using (PeerClient client = new PeerClient())
{
Notification notification = null;
PeerSession session = await client.ConnectAsync(hash, address);
Console.WriteLine($"Hash: {hash}");
Console.WriteLine($"Peer: {session.Peer}");
Console.WriteLine();
switch (options.Command)
{
case "download":
session.Download(options.Destination);
break;
}
while (notification?.Type != NotificationType.DataCompleted)
{
notification = await session.NextAsync();
Console.WriteLine(notification);
}
}
}
}
void HandleSessionEvent(PeerSession s, PeerNode fromNode)
{
// check that the received Session doesn't claim to own something it doesn"t
Task curTask = TaskScheduler.Instance().GetTask(s.TaskId);
PeerSession curSess = sessionsList.GetById(s.Id);
if (curTask == null || curSess == null)
{
throw new NodeSecurityException("Node #" + fromNode.Id + " claims it handles a task (#" + s.TaskId + ") or a session (#" + s.Id + ") which doesn't exist");
}
if ((s.Kind == SessionType.Backup && (curTask.NodeId != fromNode.Id /*|| curTask.BackupSet.HandledBy != fromNode.Id */)) ||
(s.Kind == SessionType.Store && curSess.ToNode.Id != fromNode.Id)
)
{
throw new NodeSecurityException("Node #" + fromNode.Id + " claims it handles a task (#" + s.TaskId + ") it doesn't own !");
}
Logger.Append("HUBRN", Severity.TRIVIA, "Task #" + s.TaskId + " : session #" + s.Id + " between node #" + s.FromNode.Id + " and node #" + s.ToNode.Id + " ended.");
curSess.SetUsage(s);
if (curSess.IsStorageUsageConfirmed())
{
Logger.Append("HUBRN", Severity.TRIVIA, "Task #" + s.TaskId + " : session #" + s.Id + " : Storage space usage has been double-confirmed");
PeerNode n = NodesList[curSess.ToNode.Id];
lock (n){ // Release reserved space and set really consumed space
n.ReservedSpace -= curSess.Budget * curTask.BackupSet.MaxChunkSize;
n.StorageUsed += curSess.RealHandledData;
}
}
}
public void AddIceCandidate(string sdpMid, int sdpMlineIndex, string candidate)
{
PeerSession.AddIceCandidate(new IceCandidate()
{
Content = candidate,
SdpMid = sdpMid,
SdpMlineIndex = sdpMlineIndex
});
}
/// <summary>
/// Send used space Hub, in order to update storagegroup available space
/// </summary>
public void SendSessionUpdate(PeerSession s)
{
this.StorageSize -= s.RealHandledData;
HubWrite(new NodeMessage {
Context = MessageContext.Task,
TaskId = s.TaskId,
Action = "SESSION",
Data = s.ToJson <PeerSession>()
//Data2 = sessionId+""
});
}
public void Dispose()
{
try
{
// Unable to exit process until DataChannel is removed/disposed,
// and this throws internally (at least in 2.0 version).
PeerSession?.RemoveDataChannel(CaptureChannel);
}
catch { }
PeerSession.Transceivers.RemoveAll(x => true);
Disposer.TryDisposeAll(Transceiver?.LocalVideoTrack, VideoSource, PeerSession);
GC.SuppressFinalize(this);
}
/// <summary>
/// Adds or remove a transfer session. Also updates the storage node's load accordingly
/// </summary>
/// <param name='s'>
/// S : the PeerSession
/// </param>
/// <param name='added'>
/// If set to <c>true</c>,the session has to be added, else it has to be removed
/// </param>
private static void AddRemoveSession(PeerSession s, bool added)
{
Console.WriteLine("AddRemoveSession1(" + added + ") : Node #" + s.ToNode.Id + " load=" + s.ToNode.CurrentLoad);
if (added)
{
sessionsList.Add(s);
NodesList[s.ToNode.Id].CurrentLoad += 1 / (s.ToNode.StoragePriority);
}
else
{
sessionsList.Remove(s);
NodesList[s.ToNode.Id].CurrentLoad -= 1 / (s.ToNode.StoragePriority);
}
Console.WriteLine("AddRemoveSession2(" + added + ") : Node #" + s.ToNode.Id + " load=" + NodesList[s.ToNode.Id].CurrentLoad);
}
/// <summary>
/// Request a destination for data chunks.
/// Hub replies with Session object.
/// </summary>
private static void AskStorage(PeerSession s, int parallelism, bool isIndex, bool alternateRequest)
{
string action = "ASKSTORAGE";
if (isIndex)
{
action = "INDEXSTORAGE";
}
HubWrite(new NodeMessage {
Context = MessageContext.Task,
Action = action,
TaskId = s.TaskId,
Data = s.ToJson <PeerSession>(),
Data2 = string.Format("{0} {1}", parallelism, alternateRequest)
});
}
public void Dispose()
{
try
{
// Unable to exit process until DataChannel is removed/disposed,
// and this throws internally (at least in 2.0 version).
PeerSession?.RemoveDataChannel(CaptureChannel);
}
catch { }
Disposer.TryDisposeAll(new IDisposable[]
{
PeerSession,
Transceiver?.LocalVideoTrack,
VideoSource
});
}
public void Dispose()
{
try
{
Transceiver?.LocalVideoTrack?.Dispose();
VideoSource?.Dispose();
try
{
// Unable to exit process until DataChannel is removed/disposed,
// and this throws internally (at least in 2.0 version).
PeerSession?.RemoveDataChannel(CaptureChannel);
}
catch { }
PeerSession?.Dispose();
}
catch { }
}
private void CreateStorageSession(PeerSession s, Task currentTask, bool isIndexSession)
{
// 1 - we tell storage node to accept transfer from client, if shared key is verified
NodesList.GetById(s.ToNode.Id).SendSession(s, SessionType.Store, false);
// 2 - we tell client node where to put chunk
NodesList.GetById(s.FromNode.Id).SendSession(s, SessionType.Backup, isIndexSession);
NodesList.GetById(s.ToNode.Id).ReservedSpace += currentTask.BackupSet.MaxChunkSize * s.Budget;
if (sessionsList.GetById(s.Id) == null)
{
AddRemoveSession(s, true);
}
else
{
sessionsList[s.Id].RenewBudget(s.Budget);
}
}
public Session(PeerSession s, X509Certificate2 nodeCert)
{
logger = new SessionLogger(this);
this.Id = s.Id;
this.Kind = s.Kind;
this.Budget = s.Budget;
this.FromNode = s.FromNode;
this.ToNode = s.ToNode;
this.TaskId = s.TaskId;
this.GuidKey = System.Guid.NewGuid().ToByteArray();
this.Secret = s.Secret;
//myKeyPairCrypto = csp;
cert = nodeCert;
AuthenticatedEvent = new ManualResetEvent(false);
if (this.Kind == SessionType.Store)
{
this.Budget = 0; // bug?? do we have to initialize to 0 when receiving/storing?
// client-side flags are not relevant here since the client data processing is not initialized by the Session.
if (s.Flags.HasFlag(DataProcessingFlags.CChecksum))
{
s.Flags ^= DataProcessingFlags.CChecksum;
}
if (s.Flags.HasFlag(DataProcessingFlags.CCompress))
{
s.Flags ^= DataProcessingFlags.CCompress;
}
if (s.Flags.HasFlag(DataProcessingFlags.CDedup))
{
s.Flags ^= DataProcessingFlags.CDedup;
}
if (s.Flags.HasFlag(DataProcessingFlags.CEncrypt))
{
s.Flags ^= DataProcessingFlags.CEncrypt;
}
this.Flags = s.Flags;
pipeline = new Node.DataProcessing.DataPipeline(Node.DataProcessing.PipelineMode.Read, this.Flags);
logger.Log(Severity.DEBUG, "Creating storage session (" + this.Kind.ToString() + ") with client node #" + this.FromNode.Id + " (" + this.FromNode.IP + ":<UNAVAILABLE>)");
}
else if (this.Kind == SessionType.Backup)
{
this.CryptoKey = System.Guid.NewGuid().ToByteArray();
logger.Log(Severity.DEBUG, "Creating client session #" + this.Id + " with storage node #" + this.ToNode.Id + " (" + this.ToNode.IP + ":" + this.ToNode.ListenPort + ")");
}
}
private void RenewStorageSession(Task task, long sessionId, int budget)
{
PeerSession existingSession = sessionsList.GetById(sessionId);
if (existingSession != null)
{
PeerNode n = NodesList[existingSession.ToNodeId];
existingSession.RenewBudget(budget);
if ((n.StorageSize - n.StorageUsed - n.ReservedSpace) > task.BackupSet.MaxChunkSize * budget)
{
CreateStorageSession(existingSession, task, false);
}
else
{
throw new Exception("Cannot Renew session #" + sessionId);
}
}
}
public async Task SetRemoteDescription(string type, string sdp)
{
if (!Enum.TryParse <SdpMessageType>(type, true, out var sdpMessageType))
{
Logger.Write("Unable to parse remote WebRTC description type.");
return;
}
await PeerSession.SetRemoteDescriptionAsync(new SdpMessage()
{
Content = sdp,
Type = sdpMessageType
});
if (sdpMessageType == SdpMessageType.Offer)
{
PeerSession.CreateAnswer();
}
}
private void StartBackupSession(PeerSession s, bool isIndex)
{
Logger.Append(Severity.DEBUG, "Received permission to store " + s.Budget + " chunks to node #" + s.ToNode.Id + ":" + s.ToNode.IP + " " + s.ToNode.ListenPort);
try{
Session backupSess = GetStorageSession(s);
if (!isIndex)
{
currentJobs[s.TaskId].SessionReceived(backupSess);
}
else
{
currentJobs[s.TaskId].SendIndex(backupSess);
}
}
catch (Exception e) { // could not get session with storage node, ask alternate destination to hub
Logger.Append(Severity.WARNING, "Could not connect to storage node #" + s.ToNode.Id + " (" + e.Message + "---" + e.StackTrace + "), asking ALTernate destination to hub");
//AskStorage(s.TaskId, s.Id, 1, true);
AskStorage(s, 1, false, true);
}
}
private void ReceiveDelete(PeerSession s, string chunkName)
{
bool alreadyExistingSession = false;
foreach (Session listeningSess in sessions)
{
if (listeningSess.Kind == SessionType.CleanData && listeningSess.Id == s.Id)
{
alreadyExistingSession = true;
Logger.Append(Severity.DEBUG, "Reusing existing cleaning session #" + s.Id + " with node " + s.FromNode.Id + " (" + s.FromNode.IP + ":" + ")");
}
}
if (!alreadyExistingSession)
{
Logger.Append(Severity.DEBUG, "Creating new session to delete data from node " + s.FromNode.Id + " (" + s.FromNode.IP + ":" + ")");
Session client1 = new Session(s, cert);
client1.SessionRemoved += this.RemoveSession;
client1.UpdateStorageEvent += this.SendSessionUpdate;
sessions.Add(client1);
StartListeningForClient(client1);
}
}
private void CreateStorageSessions(PeerNode askingNode, List <PeerNode> targetNodes, Task currentTask, int budget, DataProcessingFlags flags, bool isIndexStorage)
{
foreach (PeerNode chunkDestNode in targetNodes)
{
PeerSession targetSess = null;
try{
int sessId = sessionsList.Count + 1;
targetSess = new PeerSession {
FromNode = askingNode,
ToNode = chunkDestNode,
Id = sessId, //sessionId,
Flags = flags, //currentTask.BackupSet.DataFlags,
TaskId = currentTask.Id,
Kind = SessionType.Backup,
Secret = currentTask.EncryptionKey
};
targetSess.RenewBudget(budget);
CreateStorageSession(targetSess, currentTask, isIndexStorage);
//if (SessionChanged != null && existingSession == null) SessionChanged(true, SessionType.Backup, targetSess.Id, this, chunkDestNode, currentTask.Id, budget);
// 3 - we add the storage node(s) to task
currentTask.AddStorageNode(chunkDestNode);
}
catch (IOException ioe) {
// change back destination's available space
//chunkDestNode.Available = chunkDestNode.Available + currentTask.BackupSet.MaxChunkSize*budget;
Utilities.Logger.Append("HUBRN", Severity.ERROR, "dest " + chunkDestNode.Name + " not available (" + ioe.Message + "), looking for an alternate one");
// try another node, recursive call
//ChooseStorage(askingNode.Id, s, 1, false, true);
ChooseStorage(askingNode.Id, new PeerSession {
TaskId = currentTask.Id, Id = -1
}, 1, false, true);
}
catch (Exception ex) {
Utilities.Logger.Append("HUBRN", Severity.ERROR, "dest " + chunkDestNode.Name + " : " + ex.Message);
}
}
}
/// <summary>
/// Gets destinations for storing data chunks. Destinations count can be 1 to R (redundancy level) or 1 to p (p=paralleism)
///
/// </summary>
/// <param name="bsId">
/// A <see cref="System.Int32"/>
/// </param>
/// <param name="chunkName">
/// A <see cref="System.String"/>
/// </param>
/// <param name="size">
/// A <see cref="System.Int64"/>
/// </param>
/// <param name="isIndex">
/// A <see cref="System.Boolean"/>. If set to true, this tells the client to send a confirmation when chunk has effectively
/// been transfered and stored : this way we can track index location(s) into database.
/// </param>
//private void ChooseStorage(int nodeId, long taskId, long sessionId, int parallelism, bool isIndex, bool isAlternateRequest){
private void ChooseStorage(uint nodeId, PeerSession s, int parallelism, bool isIndex, bool isAlternateRequest)
{
Task currentTask = TaskScheduler.Instance().GetTask(s.TaskId);
try{
if (s.Id > 0 && !isAlternateRequest)
{
RenewStorageSession(currentTask, s.Id, 20);
return;
}
}
catch (Exception e) {
Logger.Append("HUBRN", Severity.WARNING, "Could not renew storage session #" + s.Id + ", will try to obtain a new one. Error : " + e.Message);
isAlternateRequest = true;
}
PeerNode askingNode = NodesList[nodeId];
Console.WriteLine("choosedestinations : askingNode = #" + askingNode.Id);
List <PeerNode> dests = new List <PeerNode>();
List <P2PBackup.Common.Node> excludedDests = new List <P2PBackup.Common.Node>();
excludedDests.Add(askingNode);
int budget = currentTask.StorageBudget;
if (budget == 0)
{
budget = 20; // default value if task has never run before.
}
if (isIndex) // only return a session with a budget of 1
{
Console.WriteLine("ChooseDestinations() : requested index storage");
budget = 1;
parallelism = 1;
}
if (isAlternateRequest) // request for new destination after failure with an already existing session
{
currentTask.AddLogEntry(new TaskLogEntry {
TaskId = s.TaskId, Code = 601, Message1 = "" + s.Id
});
AddRemoveSession(s.Id, false);
excludedDests.AddRange(currentTask.StorageNodes);
parallelism = 1;
}
if (dests.Count == 0) // if not asked to renew already existing session (thus existing destination)
{
dests = CalculateChunkDestinations(s.TaskId, parallelism, budget, excludedDests);
}
if (dests.Count > 0)
{
// for each storage node, budget = budget/nbnodes+1
int perNodeBudget = budget / dests.Count + 1;
CreateStorageSessions(askingNode, dests, currentTask, perNodeBudget, currentTask.BackupSet.DataFlags, isIndex);
}
else
{
Utilities.Logger.Append("HUBRN", Severity.WARNING, "Task #" + s.TaskId + " : No storage space available for request of client #" + askingNode.Id + " (" + askingNode.Name + "), <TODO> handle that and report");
TaskScheduler.AddTaskLogEntry(s.TaskId, new TaskLogEntry {
TaskId = s.TaskId, Code = 806
});
TaskScheduler.Instance().SetTaskStatus(s.TaskId, TaskStatus.Error);
TaskScheduler.Instance().SetTaskRunningStatus(s.TaskId, TaskRunningStatus.Cancelled);
askingNode.ManageTask(currentTask, TaskAction.Cancel);
}
}
private void HandleTaskMessage(NodeMessage message)
{
//TODO! security : verify that task is really assigned to this node
string[] decoded = message.Data.Split(new char[] { ' ' });
string[] decoded2 = string.IsNullOrEmpty(message.Data2)? null : message.Data2.Split(new char[] { ' ' });
switch (message.Action)
{
case "TASK":
long taskId = message.TaskId;
int code = int.Parse(decoded[0]);
string data = String.Empty;
string msg = String.Empty;
if (decoded.Length > 3)
{
data = decoded[3];
for (int i = 4; i < decoded.Length; i++)
{
msg += decoded[i] + " ";
}
}
if (code < 700)
{
if (code == 699) // session ended
//TaskScheduler.Instance().RemoveTaskSession(taskId, int.Parse(data));
//if (SessionChanged != null) SessionChanged(false, SessionType.Backup, short.Parse(data), this, null, taskId, 0);
{
}
}
if (code == 700) // messages updating CurrentAction, not archived
{
TaskScheduler.Instance().SetTaskCurrentActivity(taskId, code, msg);
return;
}
else if (code < 800) // INFO class messages
{
TaskScheduler.Instance().SetTaskCurrentActivity(taskId, code, data);
}
else if (code < 900) // WARNING class messages
{
TaskScheduler.Instance().SetTaskStatus(taskId, TaskStatus.Warning);
}
else // ERROR messages
{
TaskScheduler.Instance().SetTaskCurrentActivity(taskId, code, data);
TaskScheduler.Instance().SetTaskStatus(taskId, TaskStatus.Error);
}
TaskScheduler.AddTaskLogEntry(taskId, new TaskLogEntry {
TaskId = taskId, Code = code, Message1 = data
});
/*break;
* default:
* Logger.Append("DECODE_TASK", Severity.ERROR, "Unknown TaskContext message : "+message.Data);
* break;
* }*/
break;
case "TASKSTATS": // "DBU"
TaskScheduler.Instance().UpdateTaskStats(message.TaskId, long.Parse(decoded[0]), long.Parse(decoded[1]), long.Parse(decoded[2]), int.Parse(decoded[3]));
break;
case "ASKSTORAGE": // client node asks where to store data chunks
PeerSession s = message.Data.FromJson <PeerSession>();
if (s.Id > 0) // Nodes consumed previous session budget, update storage space
{
SessionEvent(s, this);
}
//NeedStorageEvent(this.Id, message.TaskId, sessionId, int.Parse(decoded[1]), false, bool.Parse(decoded[2]));
if (NeedStorageEvent != null)
{
NeedStorageEvent(this.Id, s, int.Parse(decoded2[0]), false, bool.Parse(decoded2[1]));
}
break;
case "SESSION":
if (SessionEvent != null)
{
SessionEvent(message.Data.FromJson <PeerSession>(), this);
}
break;
case "INDEXSTORAGE": // client node asks where to store chunks
PeerSession ps = message.Data.FromJson <PeerSession>();
if (NeedStorageEvent != null)
{
NeedStorageEvent(this.Id, ps, 1, true, false); // TODO : instead of false parse from message to know if index request is an alternate one
}
break;
case "TASKDONE":
SendAvailableSpace();
TaskScheduler.Instance().UpdateTerminatedTask(message.Data.FromJson <Task>());
break;
default:
throw new P2PBackup.Common.ProtocolViolationException(message);
}
}