/// <summary>Common code to signify the failure of edge creation.</summary>
protected void FailedEdgeCreate(TunnelEdgeCallbackAction teca)
{
teca.Success.Value = false;
teca.Exception.Value = new Exception("Not enough forwarders!");
teca.Edge.Value = null;
_node.EnqueueAction(teca);
}
/// <summary>Common code to Create an outgoing edge.</summary>
protected void CreateEdge(TunnelEdgeCallbackAction teca, List <Connection> overlap)
{
if (_connections.Contains(teca.TunnelTA.Target))
{
FailedEdgeCreate(teca);
return;
}
TunnelEdge te = null;
while (true)
{
te = new TunnelEdge(this, (TunnelTransportAddress)_local_tas[0],
teca.TunnelTA, _iasf.GetForwarderSelector(), overlap);
lock (_sync) {
if (!_id_to_tunnel.ContainsKey(te.LocalID))
{
_id_to_tunnel[te.LocalID] = te;
break;
}
}
// Arriving here, implies another TunnelEdge will be created and this
// one needs to be closed
te.Close();
}
te.CloseEvent += CloseHandler;
teca.Success.Value = true;
teca.Exception.Value = null;
teca.Edge.Value = te;
_node.EnqueueAction(teca);
}
/// <summary>First we try to find a third party we can connect with for
/// overlap, if that is successful, we attempt to connect to him, if that
/// is successful, we create a new tunnel edge.</summary>
protected void AttemptToCreateOverlap(TunnelEdgeCallbackAction teca)
{
WaitCallback create_connection = delegate(object o) {
Address target = o as Address;
if (o == null)
{
FailedEdgeCreate(teca);
return;
}
ConnectionList cons = _connections;
int index = cons.IndexOf(target);
if (index < 0)
{
FailedEdgeCreate(teca);
return;
}
List <Connection> overlap = new List <Connection>(1);
overlap.Add(cons[index]);
CreateEdge(teca, overlap);
};
Channel chan = new Channel(1);
chan.CloseEvent += delegate(object o, EventArgs ea) {
Address target = null;
try {
IDictionary msg = (chan.Dequeue() as RpcResult).Result as IDictionary;
target = _ito.EvaluatePotentialOverlap(msg);
} catch {
}
if (target == null)
{
FailedEdgeCreate(teca);
}
else
{
_oco.ConnectTo(target, create_connection);
}
};
ISender s = new AHExactSender(_node, teca.TunnelTA.Target);
_node.Rpc.Invoke(s, chan, "tunnel.RequestSync");
}
/// <summary>Does not immediately create an edge to a remote node, instead,
/// it tells a timer to wait 5 seconds prior to attempting an edge.</summary>
public override void CreateEdgeTo(TransportAddress ta, EdgeCreationCallback ecb)
{
TunnelTransportAddress tta = ta as TunnelTransportAddress;
if (tta == null)
{
ecb(false, null, new Exception("TA Type is not Tunnel!"));
}
else
{
TunnelEdgeCallbackAction teca = new TunnelEdgeCallbackAction(tta, ecb);
System.Action <DateTime> callback = delegate(DateTime now) {
CreateEdgeTo(teca);
};
Brunet.Util.FuzzyTimer.Instance.DoAfter(callback, 10000, 0);
}
}
/// <summary>The delayed callback for CreateEdgeTo, we create an edge if
/// there is a potential non-tunnel overlap and allow the Linker to do the
/// rest.</summary>
protected void CreateEdgeTo(TunnelEdgeCallbackAction teca)
{
ConnectionList cons = _connections;
List <Connection> overlap = _ito.FindOverlap(teca.TunnelTA, cons);
if (overlap.Count == 0)
{
if (_ito == null)
{
FailedEdgeCreate(teca);
}
else
{
AttemptToCreateOverlap(teca);
}
return;
}
CreateEdge(teca, overlap);
}
/// <summary>Common code to signify the failure of edge creation.</summary>
protected void FailedEdgeCreate(TunnelEdgeCallbackAction teca)
{
teca.Success.Value = false;
teca.Exception.Value = new Exception("Not enough forwarders!");
teca.Edge.Value = null;
_node.EnqueueAction(teca);
}
/// <summary>Common code to Create an outgoing edge.</summary>
protected void CreateEdge(TunnelEdgeCallbackAction teca, List<Connection> overlap)
{
if(_connections.Contains(teca.TunnelTA.Target)) {
FailedEdgeCreate(teca);
return;
}
TunnelEdge te = null;
while(true) {
te = new TunnelEdge(this, (TunnelTransportAddress) _local_tas[0],
teca.TunnelTA, _iasf.GetForwarderSelector(), overlap);
lock(_sync) {
if(!_id_to_tunnel.ContainsKey(te.LocalID)) {
_id_to_tunnel[te.LocalID] = te;
break;
}
}
// Arriving here, implies another TunnelEdge will be created and this
// one needs to be closed
te.Close();
}
te.CloseEvent += CloseHandler;
teca.Success.Value = true;
teca.Exception.Value = null;
teca.Edge.Value = te;
_node.EnqueueAction(teca);
}
/// <summary>First we try to find a third party we can connect with for
/// overlap, if that is successful, we attempt to connect to him, if that
/// is successful, we create a new tunnel edge.</summary>
protected void AttemptToCreateOverlap(TunnelEdgeCallbackAction teca)
{
WaitCallback create_connection = delegate(object o) {
Address target = o as Address;
if(o == null) {
FailedEdgeCreate(teca);
return;
}
ConnectionList cons = _connections;
int index = cons.IndexOf(target);
if(index < 0) {
FailedEdgeCreate(teca);
return;
}
List<Connection> overlap = new List<Connection>(1);
overlap.Add(cons[index]);
CreateEdge(teca, overlap);
};
Channel chan = new Channel(1);
chan.CloseEvent += delegate(object o, EventArgs ea) {
Address target = null;
try {
IDictionary msg = (chan.Dequeue() as RpcResult).Result as IDictionary;
target = _ito.EvaluatePotentialOverlap(msg);
} catch {
}
if(target == null) {
FailedEdgeCreate(teca);
} else {
_oco.ConnectTo(target, create_connection);
}
};
ISender s = new AHExactSender(_node, teca.TunnelTA.Target);
_node.Rpc.Invoke(s, chan, "tunnel.RequestSync");
}
/// <summary>The delayed callback for CreateEdgeTo, we create an edge if
/// there is a potential non-tunnel overlap and allow the Linker to do the
/// rest.</summary>
protected void CreateEdgeTo(TunnelEdgeCallbackAction teca)
{
ConnectionList cons = _connections;
List<Connection> overlap = _ito.FindOverlap(teca.TunnelTA, cons);
if(overlap.Count == 0) {
if(_ito == null) {
FailedEdgeCreate(teca);
} else {
AttemptToCreateOverlap(teca);
}
return;
}
CreateEdge(teca, overlap);
}
/// <summary>Does not immediately create an edge to a remote node, instead,
/// it tells a timer to wait 5 seconds prior to attempting an edge.</summary>
public override void CreateEdgeTo(TransportAddress ta, EdgeCreationCallback ecb)
{
TunnelTransportAddress tta = ta as TunnelTransportAddress;
if(tta == null) {
ecb(false, null, new Exception("TA Type is not Tunnel!"));
} else {
TunnelEdgeCallbackAction teca = new TunnelEdgeCallbackAction(tta, ecb);
System.Action<DateTime> callback = delegate(DateTime now) {
CreateEdgeTo(teca);
};
Brunet.Util.FuzzyTimer.Instance.DoAfter(callback, 10000, 0);
}
}
