async Task HandleRequest(InventoryMessage message, int peerId)
{
// Data should not contain anything. (To prevent DDoS)
if (!message.Data.IsNull())
{
throw new ArgumentException();
}
byte[] data;
if (message.IsBlock)
{
// ちゃんとしたブロック？
// ハッシュテーブルのそのブロックあるか見てみる
if (!Blocks.TryGetValue(message.ObjectId, out data))
{
return;
}
}
else
{
Transaction tx;
// ちゃんとしたトランザクション
if (!MemoryPool.TryGetValue(message.ObjectId, out tx))
{
return;
}
data = tx.Original;
}
message.Type = Body;
message.Data = data;
// 送ってあげる
await ConnectionManager.SendAsync(message, peerId);
}
public Task HandleMessage(InventoryMessage message, int peerId)
{
switch (message.Type)
{
case Advertise: return(HandleAdvertise(message, peerId));
case Request: return(HandleRequest(message, peerId));
case Body: return(HandleBody(message, peerId));
default: return(Task.CompletedTask);
}
}
public Task HandleMessage(InventoryMessage message, int peerId)
{
switch (message.Type)
{
// このブロック・トランザクション持ってますか？
case Advertise: return(HandleAdvertise(message, peerId));
// くれ！
case Request: return(HandleRequest(message, peerId));
// あげる！
case Body: return(HandleBody(message, peerId));
default: return(Task.CompletedTask);
}
}
async Task HandleAdvertise(InventoryMessage message, int peerId)
{
// Data should not contain anything. (To prevent DDoS)
if (!message.Data.IsNull())
{
throw new ArgumentException();
}
var haveObject = message.IsBlock ?
Blocks.ContainsKey(message.ObjectId) :
MemoryPool.ContainsKey(message.ObjectId);
if (haveObject)
{
return;
}
message.Type = Request;
await ConnectionManager.SendAsync(message, peerId);
}
async Task HandleBody(InventoryMessage message, int peerId)
{
if (message.IsBlock)
{
var block = TryLoadBlock(message.ObjectId, message.Data);
if (block.IsNull())
{
return;
}
var prevId = block.PreviousHash;
if (!Blocks.ContainsKey(prevId))
{
// Otherwise, ask the sending peer to provide previous block.
await ConnectionManager.SendAsync(new InventoryMessage
{
Type = Request,
IsBlock = true,
ObjectId = prevId,
}, peerId);
}
}
else
{
var success = TryAddTransactionToMemoryPool(
message.ObjectId, message.Data);
if (!success)
{
return;
}
}
message.Type = Advertise;
message.Data = null;
await ConnectionManager.BroadcastAsync(message, peerId);
}
async Task HandleBody(InventoryMessage message, int peerId)
{
// Data should not exceed the maximum size.
var data = message.Data;
if (data.Length > MaximumBlockSize)
{
throw new ArgumentException();
}
// ハッシュ値正しい？
var id = message.IsBlock ?
BlockchainUtil.ComputeBlockId(data) :
Hash.ComputeDoubleSHA256(data);
if (!ByteString.CopyFrom(id).Equals(message.ObjectId))
{
return;
}
if (message.IsBlock)
{
// ミューテックス
lock (Blocks)
{
if (Blocks.ContainsKey(message.ObjectId))
{
return;
}
// ハッシュテーブルに追加
Blocks.Add(message.ObjectId, data);
}
var block = BlockchainUtil.DeserializeBlock(data);
// 前のブロックも知らなかったら前のももらう
var prevId = block.PreviousHash;
if (!Blocks.ContainsKey(prevId))
{
await ConnectionManager.SendAsync(new InventoryMessage
{
Type = Request,
IsBlock = true,
ObjectId = prevId,
}, peerId);
}
Executor.ProcessBlock(block);
}
else
{
if (MemoryPool.ContainsKey(message.ObjectId))
{
return;
}
var tx = BlockchainUtil.DeserializeTransaction(data);
// Ignore the coinbase transactions.
if (tx.InEntries.Count == 0)
{
return;
}
lock (MemoryPool)
{
if (MemoryPool.ContainsKey(message.ObjectId))
{
return;
}
MemoryPool.Add(message.ObjectId, tx);
}
}
message.Type = Advertise;
message.Data = null;
// 他の人に教えてあげる
await ConnectionManager.BroadcastAsync(message, peerId);
}
void MineFromLastBlock(CancellationToken token)
{
// Takeout memory pool transactions.
var size = 350; // Estimated block header + coinbase size
var txs = InventoryManager.MemoryPool
.Select(tx => tx.Value)
.TakeWhile(tx => (size += tx.Original.Length + 50)
< InventoryManager.MaximumBlockSize)
.ToList(); // Iteration should end immediately.
// Choose transactions that are valid.
var blockTime = DateTime.UtcNow;
ulong coinbase = BlockParameter.GetCoinbase(Executor.Latest.Height + 1);
var spent = new List <TransactionOutput>();
txs = txs.Where(tx =>
{
try
{
token.ThrowIfCancellationRequested();
Executor.Run(tx, blockTime, spentTxo: spent);
var exec = tx.ExecInfo;
coinbase += exec.TransactionFee;
spent.AddRange(exec.RedeemedOutputs);
return(true);
}
catch { return(false); }
}).ToList();
// Create coinbase transaction structure.
var coinbaseTx = new Transaction
{
Timestamp = blockTime,
InEntries = new List <InEntry>(),
OutEntries = new List <OutEntry>
{
new OutEntry
{
RecipientHash = RecipientAddress,
Amount = coinbase,
},
},
};
// We need backing byte-encoded behind.
coinbaseTx = DeserializeTransaction(Serialize(coinbaseTx));
Executor.Run(coinbaseTx, blockTime, coinbase);
txs.Insert(0, coinbaseTx);
// Calculate root hash.
var txIds = txs.Select(x => x.Id).ToList();
var block = new Block
{
PreviousHash = Executor.Latest.Id,
Difficulty = BlockParameter.GetNextDifficulty(
Executor.Latest.Ancestors(Executor.Blocks)),
MerkleRoot = CalculateMerkleRoot(txs),
};
if (!Mine(block, token))
{
return;
}
block.TransactionIds = txIds;
block.Transactions = txs.Select(x => x.Original).ToList();
block.ParsedTransactions = txs.ToArray();
logger.LogInformation("Block mined: {0}",
JsonConvert.SerializeObject(block, Formatting.Indented));
var msg = new InventoryMessage
{
Data = Serialize(block),
ObjectId = block.Id,
IsBlock = true,
Type = InventoryMessageType.Body,
};
ConnectionManager.BroadcastAsync(msg);
InventoryManager.HandleMessage(msg, -1);
}
async Task HandleBody(InventoryMessage message, int peerId)
{
// Data should not exceed the maximum size.
var data = message.Data;
if (data.Length > MaximumBlockSize)
{
throw new ArgumentException();
}
var id = message.IsBlock ?
BlockchainUtil.ComputeBlockId(data) :
Hash.ComputeDoubleSHA256(data);
if (!ByteString.CopyFrom(id).Equals(message.ObjectId))
{
return;
}
if (message.IsBlock)
{
lock (Blocks)//並列処理を避ける
{
if (Blocks.ContainsKey(message.ObjectId))
{
return;
}
Blocks.Add(message.ObjectId, data);
}
var prevId = Deserialize <Block>(data).PreviousHash;
if (!Blocks.ContainsKey(prevId))
{
await ConnectionManager.SendAsync(new InventoryMessage//当該ブロックの前のブロックを持っていない場合はそれもRequestする（前のblockのIDが必要なため
{
Type = Request,
IsBlock = true,
ObjectId = prevId,
}, peerId);
}
else
{
Executor.ProcessBlock(data, prevId);
}
}
else
{
if (MemoryPool.ContainsKey(message.ObjectId))
{
return;
}
var tx = BlockchainUtil.DeserializeTransaction(data);
// Ignore the coinbase transactions.
if (tx.InEntries.Count == 0)
{
return;
}
lock (MemoryPool)
{
if (MemoryPool.ContainsKey(message.ObjectId))
{
return;
}
MemoryPool.Add(message.ObjectId, tx);
}
}
message.Type = Advertise;
message.Data = null;
await ConnectionManager.BroadcastAsync(message, peerId);
}//ネットワーク全体にもらったブロックを発信する