public async Task <IConn> Connect(SimProc process, SimEndpoint destination)
{
SimRoute route;
if (!Cluster.TryGetRoute(Name, destination.Machine, out route))
{
throw new IOException($"Route not found");
}
// todo: allocate port
// todo: allow Azure SNAT delay scenario
var socketId = NextSocketID();
var source = new SimEndpoint(Name, socketId);
var clientSocket = new SimSocket(process, source, Cluster);
try {
_sockets.Add(socketId, clientSocket);
var conn = new SimConn(clientSocket, destination, process, 0, 0);
clientSocket._connections.Add(destination, conn);
// handshake
await conn.Write(null, SimFlag.Syn);
var response = await conn.Read(5.Sec());
if (response.Flag != (SimFlag.Ack | SimFlag.Syn))
{
Debug(LogType.Warning, $"Bad handshake: {response.BodyString()}");
await conn.Write(null, SimFlag.Reset);
clientSocket._connections.Remove(destination);
throw new IOException($"Failed to connect (got {response.BodyString()})");
}
await conn.Write(null, SimFlag.Ack);
return(new ClientConn(conn));
} catch (IOException) {
throw;
}
catch (Exception ex) {
_sockets.Remove(socketId);
clientSocket.Dispose();
throw new IOException($"Failed to connect: {ex.Message}", ex);
}
}
void AddEstablishedConnection(SimConn conn)
{
var ready = new ClientConn(conn);
if (_poll != null)
{
_poll.SetResult(ready);
_poll = null;
}
else
{
_incoming.Enqueue(ready);
}
}
void AcceptNewConnection(SimPacket msg)
{
var conn = new SimConn(this, msg.Source, _proc, 0, msg.NextSeqNumber);
_connections.Add(msg.Source, conn);
_proc.Schedule(async() => {
await conn.Write(null, SimFlag.Ack | SimFlag.Syn);
var resp = await conn.Read(5.Sec());
if (resp.Flag != SimFlag.Ack)
{
Debug($"Non ACK packet: {msg.BodyString()}");
await conn.Write(null, SimFlag.Reset);
_connections.Remove(msg.Source);
return;
}
AddEstablishedConnection(conn);
});
}
public ClientConn(SimConn conn)
{
_conn = conn;
}