protected override void execute()
{
while (!Stop)
{
// Sleep for a certain time interval or while not waken up
sleepHandle.WaitOne(Settings.Instance.HELLO_CLEANUP_SLEEP_TIME);
if (Stop)
{
break; // quit
}
// The instant he woke up
//DateTime wakeup = new DateTime();
DateTime wakeup = DateTime.Now;
// Retrieves the peers list
PeersList peers = PeersList.Instance;
// Checks if anyone of the peers entry has to be removed
foreach (PeerEntry entry in peers.Rows)
{
// Computes the number of ticks (100ns) the peer entry has not been
// updated in the peers list.
TimeSpan notupdated = wakeup - entry.Timestamp;
TimeSpan t = new TimeSpan(TimeSpan.TicksPerMillisecond * Settings.Instance.MAXAGE_MILLIS);
// If this time is over a cetain threshold
if (notupdated.TotalMilliseconds > t.TotalMilliseconds)
{
// Removes the entry from the peers list
peers.del(entry.Peer.Id);
}
}
}
}
/// <summary>
/// EXECUTABLE THREAD METHOD
/// </summary>
protected override void execute()
{
// If we have no network, we can return
if (network == null)
{
NetworkCannotConnect?.Invoke();
return;
}
// Obtain a reference to the peers table
PeersList peers = PeersList.Instance;
// Run a thread dedicated to the sending of the
// hello packets (one each 20 sec.)
HelloSenderThread sender = new HelloSenderThread(network);
RegisterChild(sender); // a new child wa created
sender.CannotSend += () => {
NetworkCannotConnect?.Invoke();
};
sender.run();
// Run a thread dedicated to the cleaning of the
// peers table.
HelloCleanupThread cleanup = new HelloCleanupThread();
RegisterChild(cleanup); // a new child wa created
cleanup.run();
// Register the callback to invoke when a new packet is received
network.HelloPacketReception += onPacketReceived;
// Callback: what should we do when an information like username or picture path changes?
Settings.Instance.PropertyChanged += (object s, System.ComponentModel.PropertyChangedEventArgs e) => {
if (String.Compare(e.PropertyName, "CurrentUsername") == 0 || String.Compare(e.PropertyName, "PicturePath") == 0)
{
if (!Settings.Instance.IsInvisible) // Send a presentation packet only if not invisible
{
SendPresentationPacket();
}
}
};
Settings.Instance.PropertyChanged += Instance_visibilityChanged;
// Loop until stop condition is reached: receive packet
while (!Stop && network.receive())
{
;
}
}
/// <summary>
/// Defines the behaviour when a new packet is received.
/// </summary>
/// <param name="packet"></param>
/// <param name="senderip"></param>
private void onPacketReceived(HelloPacket packet, String senderip)
{
// Only if we have the network we can process the packet
if (network != null)
{
PeersList peers = PeersList.Instance;
// Checks the type of the received packet
if (packet.Type == HelloPacket.PacketType.Keepalive) // If it's a keepalive
// Cast the received packet to a keepalive
{
KeepalivePacket keepalive = (KeepalivePacket)packet;
// Retrieves the local peer from the Settings
//Peer localPeer = Settings.Instance.LocalPeer;
//// If the packet come from local host ...
//if (localPeer.Id == keepalive.PeerId) {
// // ... and local ip address is not updated ...
// if (localPeer.Ipaddress != senderip)
// // ... update local ip address
// Settings.Instance.updatePeerAddress(senderip);
//} else
if (peers.get(keepalive.PeerId) == null) // otherwise if the packet come from an unknown peer
{
int attempts = 0; // attempts to send the packet
// Try to send a query packet for MAX_NETFAIL_ATTEMPTS times
while (!network.sendUnicast(new QueryPacket(), senderip))
{
if (++attempts > MAX_NETFAIL_ATTEMPTS)
{
NetworkCannotConnect?.Invoke(); // failed: calling the delegate
break; // we failed to manage the packet; we will return after this break
}
System.Threading.Thread.Sleep(3000);
}
}
else // otherwise update the timestamp of the peer in the peers table
{
try {
peers.updatePeer(keepalive.PeerId, DateTime.Now, keepalive.PeerName);
} catch (PeerNotFoundException e) {
Logger.log(Logger.HELLO_DEBUG, "Peer " + keepalive.PeerId
+ " no more available even if keepalive was received from it.");
}
}
}
else if (packet.Type == HelloPacket.PacketType.Query) // If it's a query
//lock (Settings.Instance) {
{
if (!Settings.Instance.IsInvisible)
{
// Send a presentation packet to the peer who is requiring information
int attempts = 0; // attempts to send the packet
// Try to send a presentation packet for MAX_NETFAIL_ATTEMTPS times
while (!network.sendUnicast(new PresentationPacket(Settings.Instance.LocalPeer), senderip))
{
if (++attempts > MAX_NETFAIL_ATTEMPTS)
{
NetworkCannotConnect?.Invoke(); // failed: calling the delegate
break; // we failed to manage the packet; we will return after this break
}
System.Threading.Thread.Sleep(3000);
}
}
//}
}
else if (packet.Type == HelloPacket.PacketType.Presentation) // If it's a presentation
{
Peer localPeer = Settings.Instance.LocalPeer;
PresentationPacket presentation = (PresentationPacket)packet;
//Don't accept presentation from myself
if (presentation.Peer.Id != localPeer.Id)
{
// If the peer is unknown
if (peers.get(presentation.Peer.Id) == null)
{
// Put the peer in the peers table
peers.put(presentation.Peer);
}
OnProfilePicUpdate?.Invoke(presentation.Peer.Id, presentation.Peer.ByteIcon);
}
}
else if (packet.Type == HelloPacket.PacketType.GoodBye) // If it's a GoodBye
{
Peer localPeer = Settings.Instance.LocalPeer;
GoodByePacket goodBye = (GoodByePacket)packet;
//Don't accept goodBye from myself
if (goodBye.PeerId != localPeer.Id)
{
// I know the sender: I must remove it from the PeersList
if (peers.get(goodBye.PeerId) != null)
{
peers.del(goodBye.PeerId); //remove the peer from my peersList
}
}
}
}
else
{
NetworkCannotConnect?.Invoke();
}
}
