private void refreshNeigbors()
{
//lock must be used, since these variables can be accessed from Game1 methods
lock (NeighborsTable)
{
NeighborsTable.Clear();
//NeighborsTable.AddRange(Program.NodeListuC.Where(x => IsNeigbor(x)).Select(x => x.NodeAddress));
foreach (var node in Program.NodeListuC)
{
if (IsNeigbor(node))
{
NeighborsTable.Add(node.NodeAddress);
}
}
}
//remove from routeTable all the gateways that currently aren't neighbors
lock (RouteTable)
{
foreach (var item in RouteTable.ToList())
{
byte address = item.Key;
byte gateway = item.Value[0];
if (!NeighborsTable.Contains(gateway))//gateway is not neighbor
{
RouteTable.Remove(address);
}
}
}
}
public void RefreshNeigbors()
{
lock (RouteTable)
{
lock (NeighborsTable)
{
NeighborsTable.Clear();
foreach (var node in Program.NodeList)
{
if (IsNeigbor(node))
{
NeighborsTable.Add(node.Address);
if (RouteTable.ContainsKey(node.Address))
{
RouteTable.Remove(node.Address);
}
RouteTable.Add(node.Address, new KeyValuePair <string, int>(node.Address, 0)); //Longitud = 0 -> Camino directo
}
}
}
List <string> removeList = new List <string>();
foreach (var item in RouteTable)
{
if (!NeighborsTable.Contains(item.Value.Key))//is not a neigbor
{
removeList.Add(item.Key);
}
}
foreach (string address in removeList)
{
RouteTable.Remove(address);
}
}
}
void mainLoopTimer_Elapsed(object sender, ElapsedEventArgs e)
{
lock (this)
{
mainLoopTimer.Enabled = false;
RefreshNeigbors();
TimeSpan iterationTime = new TimeSpan(DateTime.Now.Ticks);
int diff = (int)(iterationTime - lastIterationTime).TotalMilliseconds;
lastIterationTime = iterationTime;
if (LookTable.Count > 0) //Check pending searches
{
List <string> items = LookTable.Keys.ToList();
for (int i = 0; i < items.Count; i++)
{
string search = items[i];
var aux = LookTable[search];
if (aux.Value > 0)
{
int newCount = aux.Value - diff;
LookTable[search] = new KeyValuePair <string, int>(aux.Key, newCount);
}
else
{
LookTable.Remove(search);
}
}
}
if (outputBuffer.Count > 0)//Messages to send
{
List <RFMessage> items = outputBuffer.Keys.ToList();
//List<RFMessage> removeList = new List<RFMessage>();
foreach (var outmsg in items)
{
if (!LookTable.ContainsKey(outmsg.To))//Look finished
{
transmitRF(outmsg);
//removeList.Add(outmsg);
outputBuffer.Remove(outmsg);
}
else if (LookTable[outmsg.To].Value <= 0)
{
Program.MessageBoxCustom("Timeout superado", "MESSAGE FROM " + outmsg.Root + " TO " + outmsg.To + " ");
//removeList.Add(outmsg);
outputBuffer.Remove(outmsg);
LookTable.Remove(outmsg.To);
}
}
//outputBuffer.RemoveAll(x => removeList.Contains(x));
}
if (inputBuffer.Count > 0)//Messages to read
{
RFMessage message = inputBuffer[0];
byte maskHeader = (byte)(message.Header & 0xC0);
if (maskHeader == 0x40)//Is RouteAnswer?
{
if (RouteTable.ContainsKey(message.Data))
{
RFMessage routeResponse = new RFMessage();
routeResponse.To = message.From;
routeResponse.From = Address;
routeResponse.Header = (byte)(0x20 | RouteTable[message.Data].Value); //RouteResponse OK y longitud almacenada en la routeTable
routeResponse.Data = message.Data; //Search Node
Node Dest = Program.NodeList.First <Node>(x => x.Address == message.From);
Dest.SendMessage(routeResponse);
}
else
{
LookFor(message.Data, message.From);
}
}
else if (maskHeader == 0x00) //Is RouteResponse?
{
bool isOK = (message.Header & 0xE0) == 0x20; //is OK?
if (isOK)
{
byte distance = (byte)(message.Header & 0x1F);
if (distance == 0x1F)
{
throw new IndexOutOfRangeException(); //Distance Overflow
}
if (RouteTable.ContainsKey(message.Data))
{
if ((distance + 1) < RouteTable[message.Data].Value) //Short way
{
RouteTable[message.Data] = new KeyValuePair <string, int>(message.From, distance + 1);
}
}
else
{
RouteTable.Add(message.Data, new KeyValuePair <string, int>(message.From, distance + 1));
}
}
else if (RouteTable.ContainsKey(message.Data) && RouteTable[message.Data].Key == message.From)
{
RouteTable.Remove(message.Data);
//Avisar a mis vecinos de que ya no puedo llegar al destinatario del mensaje
foreach (var nodeAddress in NeighborsTable)
{
if (message.From != nodeAddress)
{
RFMessage routeResponse = new RFMessage();
routeResponse.To = nodeAddress;
routeResponse.From = Address;
routeResponse.Data = message.Data; //Search Node
routeResponse.Header = 0x00; //RouteResponse FAIL
routeResponse.Root = message.Root; //TRAMPA
Node Dest = Program.NodeList.First <Node>(x => x.Address == routeResponse.To);
Dest.SendMessage(routeResponse);
}
}
//TODO: Si existen mensajes pendientes para este nodo, se reintenta para trazar una nueva ruta
if (message.Root == Address)//outputBuffer.Exists(x => x.To == message.Data))
{
//RFMessage retry = outputBuffer.First(x => x.To == message.Data);
//outputBuffer.Remove(retry);
//transmitRF(retry);
Program.MessageBoxCustom("Ha cambiado la topologia de la red. Reenviar", "MESSAGE FROM " + Address + " TO " + message.Data + " ");
}
}
if (LookTable.ContainsKey(message.Data) && LookTable[message.Data].Key != null)
{
RFMessage routeResponse = new RFMessage();
routeResponse.To = LookTable[message.Data].Key;
routeResponse.From = Address;
routeResponse.Data = message.Data; //Search Node
if (isOK)
{
routeResponse.Header = (byte)(0x20 | (byte)(message.Header & 0x1F) + 1); //RouteResponse OK y longitud recibida + 1
}
else
{
routeResponse.Header = 0x00; //RouteResponse FAIL
}
Node Dest = Program.NodeList.First <Node>(x => x.Address == routeResponse.To);
Dest.SendMessage(routeResponse);
}
LookTable.Remove(message.Data);
}
else //Is a message
{
if (message.To == Address) //it's to me?
{
message.Data += Address;
Program.MessageBoxCustom(message.Data, "MESSAGE FROM " + message.Root + " TO " + message.To + " ");
}
else if (RouteTable.ContainsKey(message.To))
{
message.From = Address;
message.Data += Address + " -> ";
Node Dest = Program.NodeList.First <Node>(x => x.Address == RouteTable[message.To].Key);
Dest.SendMessage(message);
}
else
{
RFMessage routeResponse = new RFMessage();
routeResponse.To = message.From;
routeResponse.From = Address;
routeResponse.Data = message.To; //Search Node
routeResponse.Header = 0x00; //RouteResponse FAIL
routeResponse.Root = message.Root; //TRAMPA
Node Dest = Program.NodeList.First <Node>(x => x.Address == routeResponse.To);
Dest.SendMessage(routeResponse);
}
}
inputBuffer.Remove(message);
}
}
}
private void loop()
{
TimeSpan iterationTime = new TimeSpan(DateTime.Now.Ticks);
refreshNeigbors();
if (routeBuffer.Count > 0) //check the outstanding route messages
{
ROUTE_MSG message = routeBuffer[0];
if (message.header_restype == 1) //Route Answer
{
bool isNeighbor = NeighborsTable.Contains(message.reference);
//Check if the first variable returns true, because in this case the second search is not needed
if (isNeighbor || RouteTable.ContainsKey(message.reference))
{
ROUTE_MSG routeResponse = new ROUTE_MSG();
if (isNeighbor)
{
routeResponse.header_distance = 1;
}
else
{
routeResponse.header_distance = (byte)(RouteTable[message.reference][1] + 1);
}
routeResponse.header_restype = 0; //RESPONSE
routeResponse.header_type = 0; //ROUTE
routeResponse.header_ok = 1;
routeResponse.from = NodeAddress;
routeResponse.to = message.from;
routeResponse.parent = NodeAddress;
routeResponse.reference = message.reference;
NodeuC Dest = Program.GetNode(message.parent);
Dest.SendMessage(routeResponse);
//TODO: Notify the node sought to avoid a possible subsequent search in the opposite
routeResponse.header_distance = (byte)(message.header_distance + 1);
routeResponse.from = NodeAddress;
routeResponse.to = message.reference;
routeResponse.parent = NodeAddress;
routeResponse.reference = message.from;
Dest = Program.GetNode(isNeighbor ? message.reference : RouteTable[message.reference][0]);
Dest.SendMessage(routeResponse);
addToRouteTable(message.from, message.parent, message.header_distance);
}
else
{
LookFor(message.reference, message.parent, message.from, (byte)(message.header_distance + 1));
}
Color = Color.Yellow;
}
else //Route Response
{
if (message.header_ok > 0)
{
addToRouteTable(message.reference, message.parent, message.header_distance);
if (LookTable.ContainsKey(message.reference))
{
byte interested = LookTable[message.reference][0];
if (interested != 0)
{
ROUTE_MSG routeResponse = new ROUTE_MSG();
routeResponse.header_distance = (byte)(message.header_distance + 1);
routeResponse.header_restype = 0; //RESPONSE
routeResponse.header_type = 0; //ROUTE
routeResponse.header_ok = 1;
routeResponse.from = message.from;
routeResponse.to = message.to;
routeResponse.parent = NodeAddress;
routeResponse.reference = message.reference;
NodeuC Dest = Program.GetNode(interested);
Dest.SendMessage(routeResponse);
//Store the way back if distance > 0 (message.to is not a neighbor)
byte distance = LookTable[message.reference][2];
if (distance > 0)
{
addToRouteTable(message.to, interested, distance);
}
}
LookTable.Remove(message.reference);
Color = Color.Purple;
}
}
//This case is given when it tried to route a message from a node that is no longer able to reach the recipient.
else if (RouteTable.ContainsKey(message.reference) && RouteTable[message.reference][0] == message.parent)
{
RouteTable.Remove(message.reference);
//Notify the neighbors that I can't reach the intended recipient
foreach (var neighborAddress in NeighborsTable)
{
if (message.parent != neighborAddress)
{
ROUTE_MSG routeResponse = new ROUTE_MSG();
routeResponse.header_restype = 0; //RESPONSE
routeResponse.header_type = 0; //ROUTE
routeResponse.header_ok = 0; //FAIL
routeResponse.header_distance = message.header_distance;
routeResponse.from = NodeAddress;
routeResponse.to = message.to;
routeResponse.parent = NodeAddress;
routeResponse.reference = message.reference;
NodeuC Dest = Program.GetNode(neighborAddress);
Dest.SendMessage(routeResponse);
}
}
//TODO: If there are pending messages for this node, try to trace a new route
if (message.to == NodeAddress)
{
Program.MessageBoxCustom("Ha cambiado la topología de la red. Reenviar", "MESSAGE " + message.header_distance +
" FROM " + NodeAddress + " TO " + message.reference + " ");
}
}
}
routeBuffer.Remove(message);
}
if (dataInputBuffer.Count > 0)//Data messages to read
{
Color = Color.YellowGreen;
DATA_MSG message = dataInputBuffer[0];
bool isNeighbor;
if (message.to == NodeAddress) //it's to me?
{
Color = Color.Magenta;
message.data += NodeAddress;
Program.MessageBoxCustom(message.data, "MESSAGE " + message.header_id +
" FROM " + message.from + " TO " + message.to + " BY " + message.parent + " ");
}
else if ((isNeighbor = NeighborsTable.Contains(message.to)) || RouteTable.ContainsKey(message.to))
{
message.parent = NodeAddress;
message.data += NodeAddress + " -> ";
NodeuC Dest = Program.GetNode(isNeighbor ? message.to : RouteTable[message.to][0]);
Dest.SendMessage(message);
}
else
{
ROUTE_MSG routeResponse = new ROUTE_MSG();
routeResponse.header_restype = 0; //RESPONSE
routeResponse.header_type = 0; //ROUTE
routeResponse.header_ok = 0; //FAIL
routeResponse.header_distance = message.header_id; //Use the length field to store the id of the failed message
routeResponse.from = NodeAddress;
routeResponse.to = message.from;
routeResponse.parent = NodeAddress;
routeResponse.reference = message.to;
NodeuC Dest = Program.GetNode(message.parent);
Dest.SendMessage(routeResponse);
}
dataInputBuffer.Remove(message);
}
if (dataOutputBuffer.Count > 0)//Messages to send
{
List <DATA_MSG> items = dataOutputBuffer.ToList();
foreach (var message in items)
{
if (!LookTable.ContainsKey(message.to))//Look finished
{
transmitRF(message);
dataOutputBuffer.Remove(message);
}
else if (LookTable[message.to][1] >= TIMEOUT)
{
Program.MessageBoxCustom("Timeout superado", "MESSAGE FROM " + message.from + " TO " + message.to + " ");
dataOutputBuffer.Remove(message);
LookTable.Remove(message.to);
}
}
}
int diff = (int)(iterationTime - lastLookTableUpdate).TotalMilliseconds;
if (diff > 1000 && LookTable.Count > 0) //Check the pending searches every second
{
foreach (var item in LookTable.ToList())
{
byte reference = item.Key;
byte counter = item.Value[1];
if (counter < TIMEOUT)
{
LookTable[reference][1]++;
}
else
{
LookTable.Remove(reference); //TIMEOUT limit exceeded
}
}
lastLookTableUpdate = iterationTime;
}
}