private Raft.IServer thriftServer; //INTERFACE IMPLEMENTARDA PELO SERVIDOR THRIFT, ATRAVEZ DESSA INTERFACE É POSSIVEL REALMENTE EXECUTAR AS FUNÇÕES THRIFT
public Node(List <Tuple <string, List <int> > > nodes, int node_index, Raft.IServer thriftServer)
{
this.t = 0;
this.ip = nodes[node_index].Item1;
this.port = nodes[node_index].Item2;
this.current_state = State.Follower;
this.nodes = new Dictionary <Tuple <string, int>, TCP.TCPConnection>();
this.nodes_acks = new Dictionary <Tuple <string, int>, int>();
this.cluster_id = "";
Tuple <int, int>[,] topology = this.PortTopology(nodes);
for (int i = 0; i < nodes.Count(); i++)
{
if (i == node_index)
{
continue;
}
var IPLocal = new Tuple <string, int>(this.ip, topology[node_index, i].Item1);
var IPRemote = new Tuple <string, int>(nodes[i].Item1, topology[node_index, i].Item2);
var connection = new TCP.TCPConnection(IPLocal, IPRemote);
this.nodes.Add(IPRemote, connection);
this.nodes_acks.Add(IPRemote, 0); //TODOS NODOS COMEÇAM SEM NENHUM COMMIT REALIZADO
}
this.election_time = new System.Timers.Timer(Random.random.Next(1000, 2000));
this.heartbeat_time = new System.Timers.Timer((int)(this.election_time.Interval / 3));
this.election_time.Stop();
this.heartbeat_time.Stop();
this.election_time.AutoReset = true;
this.heartbeat_time.AutoReset = true;
this.election_time.Elapsed += Election;
this.heartbeat_time.Elapsed += HeartBeat;
this.log = new Log();
this.thriftServer = thriftServer;
Console.WriteLine("RAFT :: Create node with election_time:{0}ms", this.election_time.Interval);
}
private void Listen(TCP.TCPConnection connection)
{
for (string buffer = null; true; buffer = connection.ReceiveMessage())
{
if (buffer == null || buffer == string.Empty)
{
continue;
}
foreach (var message in buffer.Split('\0').Where(str => str != string.Empty))
{
if (message.Split('|').Length != 6 || !message.Split('|')[3].Trim().Equals("null"))
{
Console.WriteLine("RAFT :: RECEIVE FROM <{0}:{1}> AT TERM={2} :: {3}", connection.IPRemote.Address, connection.IPRemote.Port, this.t, message.Trim());
}
if (message.Contains("request vote for me"))
{
if (int.Parse(message.Split('|')[0]) > this.t)
{
this.t = int.Parse(message.Split('|')[0]);
if (this.log.last_committed_index <= (int.Parse(message.Split('|')[2]))) //APENAS VOTA SIM SE A ULTIMA ENTRADA DO CANTIDO FOR MAIOR QUE A SUA, OU SEJA ESTA MAIS ATUALIZADO
{
connection.SendMessage(string.Format("{0}|vote yes", t));
}
else
{
connection.SendMessage(string.Format("{0}|vote no", t));
}
}
else
{
connection.SendMessage(string.Format("{0}|vote no", t));
}
}
else if (message.Contains("vote yes"))
{
if (int.Parse(message.Split('|')[0]) == this.t)
{
this.nVotes++;
}
}
else if (message.Contains("win"))
{
this.election_time.Stop();
var t = int.Parse(message.Split('|')[3]);
if (this.t <= t)
{
this.current_state = State.Follower;
this.heartbeat_time.Stop();
this.election_time.Start();
this.t = t;
}
//this.thriftServer.Commit(string.Format("FollowUpdateLeader({0}, {1});", this.cluster_id, this.cluster_id = message.Split('|')[5]));
}
else if (message.Contains("AE"))
{
this.resetTimer();
var t = int.Parse(message.Split('|')[0]);
if (this.t <= t)
{
this.current_state = State.Follower;
this.heartbeat_time.Stop();
this.t = t;
this.cluster_id = message.Split('|')[5];
}
var entryId = int.Parse(message.Split('|')[2]);
var LastEntry = this.log.LastEntry();
if (LastEntry == null)
{
LastEntry = new Entry()
{
id = -1
};
}
if (LastEntry.id <= entryId) //CHEGOU UMA ENTRADA ORDENADA, COMITA A ULTIMA E CONCATENA A NOVA
{
this.log.Commit(this.thriftServer);
foreach (var server in this.nodes.Keys) //TODO SEGUIDOR ASSUME QUE SE ELE RECEBEU TODA A REDE TAMBÉM RECEBEU, CASO NÃO SEJA VERDADE
//QUANDO ESSE SEGUIDOR ASSUMIR A LIDERANÇA, UM OUTRO SEGUIDOR IRÁ SOLICITAR O REGISTRO QUE É NECESSARIO
{
this.nodes_acks[server] = this.log.last_committed_index + 1;
}
if (LastEntry.id < entryId - 1) //CHEGOU UMA ENTRADA MUITO A FRENTE
{
connection.SendMessage(string.Format("NACK|{0}|{1}", this.t, LastEntry.id + 1)); //SOLICITA A ENTRADA DA SEQUENCIA
continue; //DESCARTA A ENTRADA RECEBIDA (MANTEM O LOG ORDENADO)
}
if (message.Split('|')[3].Equals("null")) //APENAS SINAL DE HEARTBEAT NÃO É UM ENVIO DE LOG
{
continue;
}
LastEntry = new Entry()
{
id = entryId,
message = message.Split('|')[3],
};
this.log.append(LastEntry);
connection.SendMessage(string.Format("ACK|{0}|{1}", this.t, LastEntry.id)); //ACEITA A NOVA MENSAGEM
}
}
else if (message.Contains("NACK"))
{
var requestedId = int.Parse(message.Split('|')[2]);
var tuple = Tuple.Create <string, int>(connection.IPRemote.Address.ToString(), connection.IPRemote.Port);
this.nodes_acks[tuple] = requestedId;
}
else if (message.Contains("ACK"))
{
var id = int.Parse(message.Split('|')[2]);
var tuple = Tuple.Create <string, int>(connection.IPRemote.Address.ToString(), connection.IPRemote.Port);
this.log.SetAck(id, tuple, this.nodes.Count());
this.nodes_acks[tuple] = id + 1;
//Console.WriteLine("NEXT FOR ME " + tuple.Item1 + ":" + tuple.Item2 + ">>>" + this.nodes_acks[tuple]);
}
}
}
}
