/// <summary>
/// Aggiunge i blocchi presenti nel vettore e ritorna l'indice dell'ultimo blocco aggiunto.
/// </summary>
/// <param name="Blocks"></param>
/// <returns></returns>
public ulong Add(CTemporaryBlock[] Blocks)
{
ulong counter = 0;
string filepath = PATH + "\\" + FILENAME;
//(!) e se scarico tutta la blockchain e da un certo punto in poi sbagliata?
foreach (CTemporaryBlock b in Blocks)
{
if (b == null)
{
break;
}
if (CValidator.ValidateBlock(b, true))
{
if (b.Header.BlockNumber == LastValidBlock.Header.BlockNumber)
{
break;
}
mLastValidBlock = b as CBlock;
counter++;
lock (Instance)
{
MemPool.Instance.RemoveBlock(b);
UTXOManager.Instance.ApplyBlock(b);
File.AppendAllText(filepath, (b as CBlock).Serialize() + '\n');
}
}
else
{
break;
}
}
return(counter);
}
private CBlock FindLastCommonBlocks()
{
ulong minLength = ulong.MaxValue, tmp = 0;
int rqsID = 0;
bool found = false;
Stack <CHeader> headers = new Stack <CHeader>();
CBlock res = null;
foreach (CPeer p in Peers)
{
try
{
rqsID = p.SendRequest(new CMessage(EMessageType.Request, ERequestType.ChainLength));
tmp = p.ReceiveULong(rqsID, 5000);
if (tmp < minLength)
{
minLength = tmp;
}
}
catch (SocketException)
{ }
p.Socket.ReceiveTimeout = 0;
}
CRange r = new CRange(CBlockChain.Instance.LastValidBlock.Header.BlockNumber, minLength);
if (r.End != ulong.MaxValue && r.Start < r.End)
{
//trova l'ultimo blocco uguale tra i peer e salva l'indice di quel blocco in r.start
int ID = 0;
while (r.Start < r.End)
{
found = true;
tmp = (r.Start + r.End) / 2;
if (r.End - r.Start == 1)
{
tmp++;
}
foreach (CPeer p in Peers)
{
ID = p.SendRequest(new CMessage(EMessageType.Request, ERequestType.GetHeader, EDataType.ULong, Convert.ToString(tmp)));
headers.Push(p.ReceiveHeader(ID, 5000));
}
while (headers.Count > 1 && found)
{
if (!(headers?.Pop().Hash == headers?.Peek().Hash))
{
found = false;
}
}
if (headers.Count == 1)
{
headers.Pop();
}
//se tutti i blocchi sono uguali allora found=true, mentre se ce n'è qualcuno di diverso found=false
if (found)
{
r.Start = tmp;
}
else if (!(r.End - r.Start == 1))
{
r.End = tmp;
}
else
{
r.End--;
}
}
//controlla se l'ultimo blocco è valido?
foreach (CPeer p in Peers)
{
ID = p.SendRequest(new CMessage(EMessageType.Request, ERequestType.DownloadBlock, EDataType.ULong, Convert.ToString(r.Start)));
res = p.ReceiveBlock(ID, 5000);
if (res != null && CValidator.ValidateBlock(res))
{
break;
}
else
{
p.Disconnect();
}
p.Socket.ReceiveTimeout = 0;
}
return(res);
}
else
{
return(CBlockChain.Instance.LastValidBlock);
}
}
private void UpdateBlockchain()
{
bool isSynced = false;
ulong addedBlocks = 0;
CTemporaryBlock[] DownloadedBlock;
CTemporaryBlock[] newBlocks;
CHeaderChain[] forkChains;
CHeaderChain bestChain;
CBlock lastCommonBlock;
CTemporaryBlock otherLastValidBlock;
lastCommonBlock = mPeers.DoRequest(ERequest.LastCommonValidBlock) as CBlock; //trova l'utlimo blocco comune tra i peers
otherLastValidBlock = mPeers.DoRequest(ERequest.LastValidBlock) as CTemporaryBlock; //trova l'ultimo blocco valido tra i peer
if (Program.DEBUG)
{
if (otherLastValidBlock != null)
{
CIO.DebugOut("Il numero di blocco di otherLastValidBlock è " + otherLastValidBlock.Header.BlockNumber + ".");
}
else
{
CIO.DebugOut("Nessun otherLastValidBlock ricevuto.");
}
}
if (CBlockChain.Instance.LastValidBlock.Header.BlockNumber < otherLastValidBlock?.Header.BlockNumber)
{
isSynced = false;
}
else if (otherLastValidBlock != null && CBlockChain.Instance.RetriveBlock(otherLastValidBlock.Header.BlockNumber).Header.Hash == otherLastValidBlock.Header.Hash)
{
isSynced = true;
}
else if (otherLastValidBlock != null)
{
isSynced = true;
otherLastValidBlock.Sender.Disconnect();
}
else
{
isSynced = true;
}
//TODO potrebbero dover essere scaricati un numero maggiore di MAXINT blocchi
while (!isSynced)
{
newBlocks = mPeers.DoRequest(ERequest.DownloadMissingBlock, new object[] { CBlockChain.Instance.LastValidBlock.Header.BlockNumber + 1, lastCommonBlock.Header.BlockNumber + 1 }) as CTemporaryBlock[];
/*foreach (CTemporaryBlock block in newBlocks)
* {
* UTXOManager.Instance.ApplyBlock(block);
* }*/
CBlockChain.Instance.Add(newBlocks);
forkChains = mPeers.DoRequest(ERequest.FindParallelChain, lastCommonBlock) as CHeaderChain[];
if (forkChains.Length > 0)
{
foreach (CHeaderChain hc in forkChains)
{
hc.DownloadHeaders();
}
bestChain = CBlockChain.Instance.BestChain(forkChains);
if (CValidator.ValidateHeaderChain(bestChain))
{
DownloadedBlock = CPeers.Instance.DistribuiteDownloadBlocks(bestChain.InitialIndex + 1, bestChain.FinalIndex);
/*foreach(CTemporaryBlock block in DownloadedBlock)
* {
* UTXOManager.Instance.ApplyBlock(block);
* }*/
mPeers.ValidPeers(bestChain.Peers);
addedBlocks = CBlockChain.Instance.Add(DownloadedBlock);
if (addedBlocks >= bestChain.Length) //solo se scarica tutti i blocchi
{
isSynced = true;
}
}
else
{
mPeers.InvalidPeers(bestChain.Peers);
otherLastValidBlock = mPeers.DoRequest(ERequest.LastValidBlock) as CTemporaryBlock;
lastCommonBlock = mPeers.DoRequest(ERequest.LastCommonValidBlock) as CTemporaryBlock;
}
}
}
if (Program.DEBUG)
{
CIO.DebugOut("Sincronizzazione Blockchain terminata!");
}
mPeers.CanReceiveBlock = true;
}
private void ExecuteRequest()
{
CMessage rqs;
while (mIsConnected)
{
Thread.Sleep(100);
if (RequestQueue.Count > 0)
{
rqs = RequestQueue.Dequeue();
switch (rqs.RqsType)
{
case ERequestType.UpdPeers:
{
if (Program.DEBUG)
{
CIO.DebugOut("UpdPeers received by " + mIp);
}
//(!) è meglio farsi ritornare la lista e poi usare json?
SendRequest(new CMessage(EMessageType.Data, ERequestType.NULL, EDataType.PeersList,
CPeers.Instance.PeersList(), rqs.ID));
break;
}
case ERequestType.NewBlockMined:
{
if (CPeers.Instance.CanReceiveBlock)
{
if (Program.DEBUG)
{
CIO.DebugOut("NewBlockMined received by " + mIp);
}
CTemporaryBlock newBlock = new CTemporaryBlock(CBlock.Deserialize(rqs.Data), this);
if (!CValidator.ValidateBlock(newBlock) && newBlock.Header.BlockNumber < CBlockChain.Instance.LastValidBlock.Header.BlockNumber)
{
Disconnect();
break;
}
//TODO scaricare i blocchi mancanti se ne mancano(sono al blocco 10 e mi arriva il blocco 50)
if (!CBlockChain.Instance.AddNewMinedBlock(newBlock))
{
Stack <CTemporaryBlock> blocks = new Stack <CTemporaryBlock>();
int ID = 0;
blocks.Push(newBlock);
for (ulong i = newBlock.Header.BlockNumber - 1; i > CBlockChain.Instance.LastValidBlock.Header.BlockNumber; i--)
{
ID = SendRequest(new CMessage(EMessageType.Request, ERequestType.DownloadBlock, EDataType.ULong, Convert.ToString(i)));
blocks.Push(new CTemporaryBlock(JsonConvert.DeserializeObject <CBlock>(ReceiveData(ID, 5000).Data), this));
if (!CValidator.ValidateBlock(blocks.Peek()) && blocks.Peek().Header.BlockNumber < CBlockChain.Instance.LastValidBlock.Header.BlockNumber)
{
Disconnect();
break;
}
if (CBlockChain.Instance.AddNewMinedBlock(blocks.Peek()))
{
blocks.Pop();
for (int j = blocks.Count; j > 0; j--)
{
CBlockChain.Instance.AddNewMinedBlock(blocks.Pop());
}
}
}
}
}
break;
}
case ERequestType.GetLastHeader:
{
if (Program.DEBUG)
{
CIO.DebugOut("GetLastHeader received by " + mIp);
}
SendRequest(new CMessage(EMessageType.Data, ERequestType.NULL, EDataType.Header,
JsonConvert.SerializeObject(CBlockChain.Instance.LastValidBlock.Header), rqs.ID));
break;
}
case ERequestType.ChainLength:
{
if (Program.DEBUG)
{
CIO.DebugOut("ChainLength received by " + mIp);
}
SendRequest(new CMessage(EMessageType.Data, ERequestType.NULL, EDataType.ULong,
Convert.ToString(CBlockChain.Instance.LastValidBlock.Header.BlockNumber), rqs.ID));
break;
}
case ERequestType.GetLastValid:
{
if (Program.DEBUG)
{
CIO.DebugOut("GetLastValid received by " + mIp);
}
SendRequest(new CMessage(EMessageType.Data, ERequestType.NULL, EDataType.Block,
CBlockChain.Instance.LastValidBlock.Serialize(), rqs.ID));
break;
}
case ERequestType.DownloadBlock:
{
if (Program.DEBUG)
{
CIO.DebugOut("DownloadBlock received by " + mIp);
}
SendRequest(new CMessage(EMessageType.Data, ERequestType.NULL, EDataType.Block,
JsonConvert.SerializeObject(CBlockChain.Instance.RetriveBlock(Convert.ToUInt64(rqs.Data), true)), rqs.ID));
break;
}
case ERequestType.DownloadBlocks:
{
if (Program.DEBUG)
{
CIO.DebugOut("DownloadBlocks received by " + mIp);
}
SendRequest(new CMessage(EMessageType.Data, ERequestType.NULL, EDataType.BlockList,
JsonConvert.SerializeObject(CBlockChain.Instance.RetriveBlocks(Convert.ToUInt64(rqs.Data.Split(';')[0]), Convert.ToUInt64(rqs.Data.Split(';')[1]))), rqs.ID));
break;
}
case ERequestType.DownloadHeaders:
{
if (Program.DEBUG)
{
CIO.DebugOut("DownloadBlocks received by " + mIp);
}
SendRequest(new CMessage(EMessageType.Data, ERequestType.NULL, EDataType.HeaderList,
JsonConvert.SerializeObject(CBlockChain.Instance.RetriveHeaders(Convert.ToUInt64(rqs.Data.Split(';')[0]), Convert.ToUInt64(rqs.Data.Split(';')[1]))), rqs.ID));
break;
}
case ERequestType.GetHeader:
{
if (Program.DEBUG)
{
CIO.DebugOut("GetLastHeader received by " + mIp);
}
SendRequest(new CMessage(EMessageType.Data, ERequestType.NULL, EDataType.Header,
JsonConvert.SerializeObject(CBlockChain.Instance.RetriveBlock(Convert.ToUInt64(rqs.Data)).Header), rqs.ID));
break;
}
case ERequestType.NewTransaction:
{
Transaction t = JsonConvert.DeserializeObject <Transaction>(rqs.Data);
if (t.Verify())
{
MemPool.Instance.AddUTX(t);
}
break;
}
default:
if (Program.DEBUG)
{
CIO.DebugOut("Ricevuto comando sconosciuto: " + rqs.RqsType + " da " + IP);
}
break;
}
}
}
}
/// <summary>
/// Rimane in attesa di messaggi dal peer a cui è collegato il socket mSocket.
/// </summary>
private void Listen()
{
string tmp;
CMessage msg;
while (mIsConnected) //bisogna bloccarlo in qualche modo all'uscita del programma credo
{
lock (mSocket)
{
if (mSocket == null)
{
break;
}
//il timer viene settato cosicchè in caso non si ricevino comunicazioni venga ritornata un'eccezione, in modo che il programma vada avanti e tolga il lock al socket.
mSocket.ReceiveTimeout = 1000;
try
{
tmp = ReceiveString();
msg = JsonConvert.DeserializeObject <CMessage>(tmp);
if (CValidator.ValidateMessage(msg))
{
msg.TimeOfReceipt = DateTime.Now;
if (msg.Type == EMessageType.Request)
{
lock (RequestQueue)
{
RequestQueue.Enqueue(msg);
}
}
else if (msg.Type == EMessageType.Data && ValidID.Contains(msg.ID))
{
lock (DataQueue)
{
DataQueue.Enqueue(msg);
ValidID.Remove(msg.ID);
}
}
else if (msg.Type == EMessageType.Disconnect)
{
this.Disconnect();
break;
}
else if (Program.DEBUG)
{
throw new ArgumentException("MessageType " + msg.Type + " non supportato.");
}
}
else
{
Disconnect();
break;
}
}
catch (SocketException)
{
}
catch (JsonSerializationException)
{
throw new Exception();
Disconnect();
}
//il timer viene reinpostato a defoult per non causare problemi con altre comunicazioni che potrebbero avvenire in altre parti del codice.
mSocket.ReceiveTimeout = 0;
}
}
}
