/// <summary>
/// Unity event, in a real world scenario that would be listening over network
/// </summary>
/// <param name="m"></param>
public void PeerMessage(Message m)
{
if (peers == null)
{
return; // not ready yet
}
if (!peers.Contains(m.sender))
{
Debug.Log("New peer connected");
peers.Add(m.sender);
}
switch (m.type)
{
case MessageType.QUERY_LATEST:
{
Message answer = new Message {
sender = this, type = MessageType.RESPONSE_BLOCKCHAIN, data = new List <Block> {
blockchain.CloneLatestBlock()
}
};
m.sender.SendMessage("PeerMessage", answer);
}
break;
case MessageType.QUERY_ALL:
{
Message answer = new Message {
sender = this, type = MessageType.RESPONSE_BLOCKCHAIN, data = blockchain.CloneChain()
};
m.sender.SendMessage("PeerMessage", answer);
}
break;
case MessageType.QUERY_TRANSACTION_POOL:
{
Message answer = new Message {
sender = this, type = MessageType.RESPONSE_TRANSACTION_POOL, data = blockchain.GetPooledTransactions()
};
m.sender.SendMessage("PeerMessage", answer);
}
break;
case MessageType.RESPONSE_BLOCKCHAIN:
{
List <Block> receivedBlocks = (List <Block>)m.data;
if (receivedBlocks == null || receivedBlocks.Count == 0)
{
Debug.LogWarning("Received empty blockchain data from peer");
return;
}
if (receivedBlocks.Count == 1)
{
if (receivedBlocks.Last().previousHash == blockchain.LastBlock().hash&& receivedBlocks.Last().index == blockchain.LastBlock().index + 1)
{
Debug.Log("Received a new block");
blockchain.StopMining();
blockchain.AddBlock(receivedBlocks.Last());
}
else if (receivedBlocks.Last().index != 0) // only query if not genesis
{
Debug.Log("Received a new block but the hash or index doesn't match. Querying the whole thing");
Message request = new Message {
sender = this, type = MessageType.QUERY_ALL, data = null
};
m.sender.SendMessage("PeerMessage", request);
}
else // replace genesis with the exising one
{
Debug.Log("Replace with existing genesis");
blockchain.ReplaceChain(receivedBlocks);
}
}
else
{
if (Blockchain.GetAccumulatedDifficulty(receivedBlocks) > blockchain.GetAccumulatedDifficulty())
{
Debug.Log("Received a new chain and its accumulated difficulty is higher, replacing...");
blockchain.ReplaceChain(receivedBlocks);
}
else
{
Debug.Log("Received a new chain and whith lower accumulated difficulty, doing nothing");
}
}
}
break;
case MessageType.RESPONSE_TRANSACTION_POOL:
{
Transaction[] receivedPoolTxs = (Transaction[])m.data;
if (receivedPoolTxs == null)
{
Debug.LogError("Received null, expection transaction pool");
return;
}
foreach (Transaction tx in receivedPoolTxs)
{
blockchain.AddToPool(tx);
}
}
break;
}
}