/*
* Algo for synchronising chain with peers most popular chain
* References: https://www.dotnetperls.com/common-elements-list
*/
private void SynchroniseChain()
{
Dictionary <string, int> hashCount = new Dictionary <string, int>();
RemoteInterface ri = null;
foreach (ClientDataStruct c in clientList)
{
//Console.WriteLine(c.ip + " " + c.port);
ri = ConnectToRemote(DecodeFrom64(c.ip), DecodeFrom64(c.port));
string daHash = ri.GetLatestBlock().Hash;
if (hashCount.TryGetValue(daHash, out int count))
{
hashCount[daHash] = count + 1;
}
else //if hash not found yet add it to hashCount
{
if (!daHash.Equals(ourBlockchain.First().Hash))
{
hashCount.Add(daHash, 1);
}
}
}
//if our latest block hash is not the same as most popular then download the most popular chain
if (hashCount.Count > 0)
{
string maxHash = hashCount.OrderBy(x => x.Value).Last().Key;//find hash with highest population count
APIClass.Block currBlock = ourRemoteThread.GetLatestBlock();
List <APIClass.Block> popularChain = null;
bool found = false;
//if latest block doesn't have the most popular hash and current block prev hash does not match popular hash then download popular chain
if (!currBlock.Hash.Equals(maxHash) && !currBlock.PrevHash.Equals(maxHash))
{
foreach (ClientDataStruct c in clientList)
{
ri = ConnectToRemote(DecodeFrom64(c.ip), DecodeFrom64(c.port));
popularChain = ri.GetCurrentChain();
if (ri.GetLatestBlock().Hash.Equals(maxHash))
{
found = true;
break;
}
}
if (found)
{
ourRemoteThread.SetChain(popularChain);
ourBlockchain = ourRemoteThread.GetCurrentChain();
}
}
}
}
/*
* creating blocks
*/
private void DoMining(MinerUtils minUtils)
{
string recvTransaction = ourRemoteThread.ReceiveTransaction(null);
if (!string.IsNullOrEmpty(recvTransaction))
{
//insert transaction details
APIClass.Block newBlock = new APIClass.Block();
newBlock.ID = ourBlockchain.Last().ID + 1;
newBlock.JsonStrList = DoPython(recvTransaction);
newBlock.Hash = "";
newBlock.PrevHash = ourRemoteThread.GetLatestBlock().Hash;
newBlock = minUtils.GenerateHash(newBlock); //create valid hash and add it to new block
ourRemoteThread.AddBlock(newBlock);
ourBlockchain = ourRemoteThread.GetCurrentChain();
}
}