public void receiveAndSendHello(RingInfo ringInfo, Peer peer, Neighbor neighbor,
BinaryWriter writer)
{
if(!peer.node.syncCommunicationPoint.Address.Equals(neighbor.peer.node.syncCommunicationPoint.Address))
//REVISIT: alert security system
return;
neighbor.peer.node.syncCommunicationPoint = peer.node.syncCommunicationPoint;
neighbor.peer.node.asyncCommunicationPoint = peer.node.asyncCommunicationPoint;
neighbor.peer.IE = peer.IE;
byte[] message = new byte[Constants.WRITEBUFFSIZE];
MemoryStream stream;
try
{
User user = User.getInstance();
BinaryFormatter serializer = new BinaryFormatter();
stream = new MemoryStream(message);
NetLib.insertEntropyHeader(serializer, stream);
serializer.Serialize(stream, Constants.MessageTypes.MSG_HELLO);
serializer.Serialize(stream, ringInfo.ring.ringID);
serializer.Serialize(stream, ringInfo.token);
serializer.Serialize(stream, new Peer(user.node, user.publicUserInfo, ringInfo.IE));
writer.Write(message);
writer.Flush();
}
catch (Exception e)
{
int x = 2;
}
}
public void sendAndReceiveHello(Peer neighbor, Ring ring)
{
byte[] message = new byte[Constants.WRITEBUFFSIZE];
byte[] reply = new byte[Constants.READBUFFSIZE];
MemoryStream stream;
try
{
User user = User.getInstance();
BinaryFormatter serializer = new BinaryFormatter();
stream = new MemoryStream(message);
NetLib.insertEntropyHeader(serializer, stream);
RingInfo ringInfo = user.findRingInfo(ring.ringID);
serializer.Serialize(stream, Constants.MessageTypes.MSG_HELLO);
serializer.Serialize(stream, ring.ringID);
serializer.Serialize(stream, ringInfo.token);
serializer.Serialize(stream, new Peer(user.node, user.publicUserInfo, ringInfo.IE));
reply = NetLib.communicate(neighbor.node.syncCommunicationPoint, message, true);
Debug.Assert(reply != null, "Neighbor did not reply to Hello");
BinaryFormatter deserializer = new BinaryFormatter();
stream = new MemoryStream(reply);
NetLib.bypassEntropyHeader(deserializer, stream);
Constants.MessageTypes replyMsg = (Constants.MessageTypes)deserializer.Deserialize(stream);
switch(replyMsg)
{
case Constants.MessageTypes.MSG_HELLO:
uint ringID = (uint)deserializer.Deserialize(stream);
if(ringID != ring.ringID)
return;
ulong token = (ulong)deserializer.Deserialize(stream);
Peer peer = (Peer)deserializer.Deserialize(stream);
IPEndPoint neighborIPEndPoint = peer.node.syncCommunicationPoint;
if(!neighborIPEndPoint.Address.Equals(neighbor.node.syncCommunicationPoint.Address))
//REVISIT: alert security system
return;
neighbor.node.syncCommunicationPoint = neighborIPEndPoint;
neighbor.node.asyncCommunicationPoint = peer.node.asyncCommunicationPoint;
neighbor.IE = peer.IE;
break;
case Constants.MessageTypes.MSG_DISCONNECT:
neighbor.IE = null;
break;
default:
neighbor.IE = null;
break;
}
}
catch (Exception e)
{
int x = 2;
}
}
public Download(Peer __peer, RingInfo __ringInfo, ResourceHeader __header,
UICallBack __UIHandler)
{
peer = __peer;
ringInfo = __ringInfo;
header = __header;
//REVISIT: make sure there is enough room for meta data. Also if very large you want to split up into a list of
//buffers or circular buffer where the buffer is written to temp file at milestones.
buffer = new byte[header.size];
bytesRead = 0;
UIHandler = __UIHandler;
}
public bool Download(Peer peer, RingInfo ringInfo, ResourceHeader resourceHeader,
UICallBack UIHndlr)
{
Download download = new Download(peer, ringInfo, resourceHeader, UIHndlr);
int downloadIndex = Add(download);
if (downloadIndex < 0)
{
Queue(download);
return false;
}
Download_Internal(download);
return true;
}
public void addPeer(Peer newPeer)
{
RRLib.SortedList peers;
foreach (InformationEntropy IE in newPeer.IE)
{
peers = (RRLib.SortedList)contentIndex.getInvertedList(IE.keyword);
if (peers == null)
{
peers = new RRLib.SortedList();
contentIndex.add(IE.keyword, peers);
}
peers.Add(new WeightedPeer(IE.weight, newPeer));
}
}
public Peer[] getAdjacentPeers(Peer peer, int IEConsiderationLength, int peersConsiderationLength, int maxPeers)
{
int IEcount = 0, peerCount, matchIndex = 0;
WeightedPeer[] matches = new WeightedPeer[IEConsiderationLength * peersConsiderationLength];
RRLib.SortedList peers;
IEnumerator peersWalker;
Peer match;
foreach (InformationEntropy IE in peer.IE)
{
if (++IEcount == IEConsiderationLength)
break;
peers = (RRLib.SortedList)contentIndex.getInvertedList(IE.keyword);
if (peers == null)
continue;
peersWalker = peers.GetEnumerator();
peerCount = 0;
while(peersWalker.MoveNext() && peerCount++ < peersConsiderationLength)
{
if(((WeightedPeer)peersWalker.Current).peer.token == peer.token)
continue;
matches[matchIndex++] = (WeightedPeer)peersWalker.Current;
}
}
Array.Sort(matches, 0, matchIndex);
Peer[] peerMatches = new Peer[matchIndex > maxPeers ? maxPeers : matchIndex];
for (matchIndex = 0; matchIndex < peerMatches.Length; matchIndex++)
{
peerMatches[matchIndex] = matches[matchIndex].peer;
}
return peerMatches;
}
public Constants.LoginStatus logon(User user)
{
Constants.LoginStatus retval = Constants.LoginStatus.STATUS_SERVERNOTREACHED;
byte[] message = new byte[Constants.WRITEBUFFSIZE];
byte[] reply;
MemoryStream stream = null;
try
{
//Serialize data in memory so you can send them as a continuous stream
BinaryFormatter serializer = new BinaryFormatter();
stream = new MemoryStream(message);
NetLib.insertEntropyHeader(serializer, stream);
serializer.Serialize(stream, Constants.MessageTypes.MSG_LOGIN);
serializer.Serialize(stream, user.ringsInfo[0].userName);
serializer.Serialize(stream, user.ringsInfo[0].password);
serializer.Serialize(stream, user.node);
reply = NetLib.communicate(Constants.SERVER,message, true);
stream.Close();
stream = new MemoryStream(reply);
Constants.MessageTypes replyMsg = (Constants.MessageTypes)serializer.Deserialize(stream);
switch(replyMsg)
{
case Constants.MessageTypes.MSG_OK:
retval = Constants.LoginStatus.STATUS_LOGGEDIN;
ulong sessionID = (ulong)serializer.Deserialize(stream);
int numAdjPeers = (int)serializer.Deserialize(stream);
Peer[] adjPeers = null;
if(numAdjPeers > 0)
{
adjPeers = new Peer[numAdjPeers];
adjPeers = (Peer[])serializer.Deserialize(stream);
}
//add the adjacent peers reported to our list (callback to Client)
this.loginCallbackTable.addAdjacentPeers(adjPeers);
loggedIn = true;
//set the session ID (callback to ServerProxy)
this.loginCallbackTable.setSessionID(sessionID);
break;
case Constants.MessageTypes.MSG_NOTAMEMBER:
retval = Constants.LoginStatus.STATUS_NOTAMEMBER;
break;
case Constants.MessageTypes.MSG_ALREADYSIGNEDIN:
retval = Constants.LoginStatus.STATUS_ALREADYSIGNEDIN;
break;
default:
break;
}
}
catch (Exception e)
{
int x = 2;
}
return retval;
}
public void sendQuery(Peer neighbor, RingInfo ringInfo, string[] columns, string[] query,
Node sender, int ttl)
{
byte[] message = new byte[Constants.WRITEBUFFSIZE];
MemoryStream stream;
if (ttl <= 0)
return;
try
{
BinaryFormatter serializer = new BinaryFormatter();
stream = new MemoryStream(message);
NetLib.insertEntropyHeader(serializer, stream);
if (columns == null)
serializer.Serialize(stream, Constants.MessageTypes.MSG_SIMPLEQUERY);
else
serializer.Serialize(stream, Constants.MessageTypes.MSG_COLUMNQUERY);
serializer.Serialize(stream, ringInfo.token);
serializer.Serialize(stream, ringInfo.ring.ringID);
serializer.Serialize(stream, sender.asyncCommunicationPoint);
serializer.Serialize(stream, ttl); //TTL
if (columns == null)
serializer.Serialize(stream, Constants.NULL_STRING_ARRAY);
else
serializer.Serialize(stream, columns);
serializer.Serialize(stream, query);
NetLib.communicateAsync(neighbor.node.asyncCommunicationPoint, message, false);
}
catch (Exception e)
{
int x = 2; //REVISIT: probably need to send info to logger.
}
}
private void processClientRingLogin(BinaryReader clientReader, BinaryWriter clientWriter)
{
//deserialize the message
BinaryFormatter deserializer = new BinaryFormatter();
uint ringID = (uint)deserializer.Deserialize(clientReader.BaseStream);
string userName = (string)deserializer.Deserialize(clientReader.BaseStream);
byte[] password = (byte[])deserializer.Deserialize(clientReader.BaseStream);
IPEndPoint commPoint = (IPEndPoint)deserializer.Deserialize(clientReader.BaseStream);
InformationEntropy[] IE = (InformationEntropy[])deserializer.Deserialize(clientReader.BaseStream);
ServerRingInfo serverRingInfo = ServerRingInfo.findServerRingInfoByID(this.serverRingsInfo, ringID);
byte[] message = new byte[Constants.WRITEBUFFSIZE];
MemoryStream stream = new MemoryStream(message);
BinaryFormatter serializer = deserializer; //reuse the object
Member member = null;
NetLib.insertEntropyHeader(serializer, stream);
//not a member need to signup first, goodbye =)
if((member = accountsManager.findMemberByUserName(userName)) == null)
{
deserializer.Serialize(stream, Constants.MessageTypes.MSG_NOTAMEMBER);
clientWriter.Write(message);
clientWriter.Flush();
return;
}
ClientSession session;
ulong sessionID;
Peer memberAsPeer = new Peer(member.node, member.publicUserInfo, IE);
//get users current node settings
member.node.syncCommunicationPoint = commPoint;
//Already on the network from the requesting device (are you a hacker?)
if((session = serverRingInfo.ringClientManager.findClientSession(member)) == null)
{
//get a session ID add the user to the client manager database
sessionID = serverRingInfo.getNextSessionID();
serverRingInfo.ringClientManager.addClient(member, sessionID);
}
else
sessionID = session.sessionID;
memberAsPeer.token = sessionID;
//give the session id and adjacent peers
serializer.Serialize(stream, Constants.MessageTypes.MSG_RINGNEIGHBORS);
serializer.Serialize(stream, sessionID);
serializer.Serialize(stream, serverRingInfo.serverPolicyManager.getSearchQueryPolicy());
serializer.Serialize(stream, serverRingInfo.serverPolicyManager.queryServer);
serializer.Serialize(stream, serverRingInfo.ringPeerManager.getAdjacentPeers(memberAsPeer,
Constants.IE_MAX_KEYWORDS_TO_CONSIDER, Constants.MAX_PEERS_TO_CONSIDER_FOR_KEYWORD,
Constants.MAX_PEERS));
clientWriter.Write(message);
clientWriter.Flush();
//Now add the new peer to the database
serverRingInfo.ringPeerManager.addPeer(memberAsPeer);
//invoke the user interface call back to update everything that depends on a new user
//joining the network
Member[] methodInvokeArgs = new Member[1];
methodInvokeArgs[0] = member;
//Asynchronous call to the UI thread
ServerUserInterface.serverUserInterfaceInstance.BeginInvoke(
serverUserInterfaceCallbackTable.addNewClient, methodInvokeArgs);
}
public WeightedPeer(float __weight, Peer __peer)
{
weight = __weight;
peer = __peer;
}
public Neighbor(Peer __peer, NeighborProxy __neighborProxy)
{
peer = __peer;
neighborProxy = __neighborProxy;
}
public void showQueryHit(RingInfo ringInfo, Peer hitPeer, ResourceHeader resourceHeader)
{
DataRow dr = queryResultsTable.NewRow();
dr[0] = hitPeer.userInfo.nickname;
dr[1] = resourceHeader.resourceID;
dr[2] = resourceHeader.name;
dr[3] = resourceHeader.size;
dr[4] = "";
dr[5] = hitPeer;
dr[6] = ringInfo;
dr[7] = resourceHeader;
this.queryResultsTable.Rows.Add(dr);
}
public void RetreiveResource(Peer peer, RingInfo ringInfo, ResourceHeader resourceHeader,
UICallBack UIHndlr)
{
downloadManager.Download(peer, ringInfo, resourceHeader, UIHndlr);
}
