/// <exception cref="BlockStoreException"/>
public StoredBlock Get(Sha256Hash hash)
{
lock (this)
{
StoredBlock block;
_blockMap.TryGetValue(hash, out block);
return block;
}
}
public static void Run(string[] args)
{
Console.WriteLine("Connecting to node");
var @params = NetworkParameters.ProdNet();
using (var blockStore = new MemoryBlockStore(@params))
{
var chain = new BlockChain(@params, blockStore);
var peer = new Peer(@params, new PeerAddress(IPAddress.Loopback), chain);
peer.Connect();
new Thread(peer.Run).Start();
var blockHash = new Sha256Hash(args[0]);
var future = peer.BeginGetBlock(blockHash, null, null);
Console.WriteLine("Waiting for node to send us the requested block: " + blockHash);
var block = peer.EndGetBlock(future);
Console.WriteLine(block);
peer.Disconnect();
}
}
// All zeros.
/// <exception cref="ProtocolException"/>
protected override void Parse()
{
Hash = ReadHash();
Index = (int) ReadUint32();
}
public InventoryItem(ItemType type, Sha256Hash hash)
{
Type = type;
Hash = hash;
}
/// <exception cref="System.IO.IOException"/>
/// <exception cref="BlockStoreException"/>
private void Load(FileInfo file)
{
Log.InfoFormat("Reading block store from {0}", file);
if (_channel != null)
{
_channel.Dispose();
}
_channel = file.OpenRead();
try
{
// Read a version byte.
var version = _channel.Read();
if (version == -1)
{
// No such file or the file was empty.
throw new FileNotFoundException(file.Name + " does not exist or is empty");
}
if (version != FileFormatVersion)
{
throw new BlockStoreException("Bad version number: " + version);
}
// Chain head pointer is the first thing in the file.
var chainHeadHash = new byte[32];
if (_channel.Read(chainHeadHash) < chainHeadHash.Length)
throw new BlockStoreException("Truncated store: could not read chain head hash.");
_chainHead = new Sha256Hash(chainHeadHash);
Log.InfoFormat("Read chain head from disk: {0}", _chainHead);
_channel.Position = _channel.Length - Record.Size;
}
catch (IOException)
{
_channel.Close();
throw;
}
catch (BlockStoreException)
{
_channel.Close();
throw;
}
}
/// <exception cref="BlockStoreException"/>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="BitcoinSharp.Core.Exceptions.ProtocolException"/>
private Record GetRecord(Sha256Hash hash)
{
var startPos = _channel.Position;
// Use our own file pointer within the tight loop as updating channel positions is really expensive.
var position = startPos;
var record = new Record();
do
{
if (!record.Read(_channel, position, _buf))
throw new IOException("Failed to read buffer");
if (record.GetHeader(_params).Hash.Equals(hash))
{
// Found it. Update file position for next time.
_channel.Position = position;
return record;
}
// Did not find it.
if (position == 1 + 32)
{
// At the start so wrap around to the end.
position = _channel.Length - Record.Size;
}
else
{
// Move backwards.
position = position - Record.Size;
Debug.Assert(position >= 1 + 32, position.ToString(CultureInfo.InvariantCulture));
}
} while (position != startPos);
// Was never stored.
_channel.Position = position;
return null;
}
/// <exception cref="BlockStoreException"/>
private void CreateNewStore(NetworkParameters @params, FileInfo file)
{
// Create a new block store if the file wasn't found or anything went wrong whilst reading.
_blockCache.Clear();
try
{
if (_channel != null)
{
_channel.Dispose();
_channel = null;
}
if (file.Exists)
{
try
{
file.Delete();
}
catch (IOException)
{
throw new BlockStoreException("Could not delete old store in order to recreate it");
}
}
_channel = file.Create(); // Create fresh.
_channel.Write(FileFormatVersion);
}
catch (IOException e1)
{
// We could not load a block store nor could we create a new one!
throw new BlockStoreException(e1);
}
try
{
// Set up the genesis block. When we start out fresh, it is by definition the top of the chain.
var genesis = @params.GenesisBlock.CloneAsHeader();
var storedGenesis = new StoredBlock(genesis, genesis.GetWork(), 0);
_chainHead = storedGenesis.BlockHeader.Hash;
_channel.Write(_chainHead.Bytes);
Put(storedGenesis);
}
catch (IOException e)
{
throw new BlockStoreException(e);
}
}
/// <exception cref="BlockStoreException"/>
public void SetChainHead(StoredBlock chainHead)
{
lock (this)
{
try
{
_chainHead = chainHead.BlockHeader.Hash;
// Write out new hash to the first 32 bytes of the file past one (first byte is version number).
var originalPos = _channel.Position;
_channel.Position = 1;
var bytes = _chainHead.Bytes;
_channel.Write(bytes, 0, bytes.Length);
_channel.Position = originalPos;
}
catch (IOException e)
{
throw new BlockStoreException(e);
}
}
}
/// <exception cref="BlockStoreException"/>
public StoredBlock Get(Sha256Hash hash)
{
lock (this)
{
if (_blockCache.Contains(hash))
{
return _blockCache[hash] as StoredBlock;
}
if (_notFoundCache.Contains(hash) && Equals(_notFoundCache[hash] as StoredBlock, _notFoundMarker))
{
return null;
}
try
{
var fromDisk = GetRecord(hash);
StoredBlock block = null;
if (fromDisk == null)
{
_notFoundCache[hash] = _notFoundMarker;
while (_notFoundCache.Count > 2050)
{
_notFoundCache.RemoveAt(0);
}
}
else
{
block = fromDisk.ToStoredBlock(_params);
_blockCache[hash] = block;
while (_blockCache.Count > 2050)
{
_blockCache.RemoveAt(0);
}
}
return block;
}
catch (IOException e)
{
throw new BlockStoreException(e);
}
catch (ProtocolException e)
{
throw new BlockStoreException(e);
}
}
}
public GetBlocksMessage(NetworkParameters networkParameters, IList<Sha256Hash> locator, Sha256Hash stopHash)
: base(networkParameters)
{
_locator = locator;
_stopHash = stopHash;
}
/// <exception cref="ProtocolException" />
protected override void Parse()
{
_version = ReadUint32();
_previousBlockHash = ReadHash();
_merkleRoot = ReadHash();
_time = ReadUint32();
_targetDifficulty = ReadUint32();
_nonce = ReadUint32();
_hash = new Sha256Hash(Utils.ReverseBytes(Utils.DoubleDigest(Bytes, 0, Cursor)));
if (Cursor == Bytes.Length)
{
// This message is just a header, it has no transactions.
return;
}
var numTransactions = (int) ReadVarInt();
Transactions = new List<Transaction>(numTransactions);
for (var i = 0; i < numTransactions; i++)
{
var transaction = new Transaction(NetworkParameters, Bytes, Cursor);
Transactions.Add(transaction);
Cursor += transaction.MessageSize;
}
}
/// <summary>
/// Adds a transaction to this block.
/// </summary>
public void AddTransaction(Transaction transaction)
{
if (Transactions == null)
{
Transactions = new List<Transaction>();
}
Transactions.Add(transaction);
// Force a recalculation next time the values are needed.
_merkleRoot = null;
_hash = null;
}
/// <summary>
/// Special case constructor, used for the genesis node, cloneAsHeader and unit tests.
/// </summary>
internal Block(NetworkParameters networkParameters)
: base(networkParameters)
{
// Set up a few basic things. We are not complete after this though.
_version = 1;
_targetDifficulty = 0x1d07fff8;
_time = (uint) SystemTime.UnixNow();
_previousBlockHash = Sha256Hash.ZeroHash;
}
/// <exception cref="System.IO.IOException"/>
/// <exception cref="BlockStoreException"/>
private void Load(FileInfo file)
{
_log.InfoFormat("Reading block store from {0}", file);
using (var input = file.OpenRead())
{
// Read a version byte.
var version = input.Read();
if (version == -1)
{
// No such file or the file was empty.
throw new FileNotFoundException(file.Name + " does not exist or is empty");
}
if (version != 1)
{
throw new BlockStoreException("Bad version number: " + version);
}
// Chain head pointer is the first thing in the file.
var chainHeadHash = new byte[32];
if (StreamExtensions.Read(input, chainHeadHash) < chainHeadHash.Length)
throw new BlockStoreException("Truncated block store: cannot read chain head hash");
_chainHead = new Sha256Hash(chainHeadHash);
_log.InfoFormat("Read chain head from disk: {0}", _chainHead);
var now = Environment.TickCount;
// Rest of file is raw block headers.
var headerBytes = new byte[Block.HeaderSize];
try
{
while (true)
{
// Read a block from disk.
if (StreamExtensions.Read(input, headerBytes) < 80)
{
// End of file.
break;
}
// Parse it.
var b = new Block(_params, headerBytes);
// Look up the previous block it connects to.
var prev = Get(b.PreviousBlockHash);
StoredBlock s;
if (prev == null)
{
// First block in the stored chain has to be treated specially.
if (b.Equals(_params.GenesisBlock))
{
s = new StoredBlock(_params.GenesisBlock.CloneAsHeader(), _params.GenesisBlock.GetWork(), 0);
}
else
{
throw new BlockStoreException("Could not connect " + b.Hash + " to " + b.PreviousBlockHash);
}
}
else
{
// Don't try to verify the genesis block to avoid upsetting the unit tests.
b.VerifyHeader();
// Calculate its height and total chain work.
s = prev.Build(b);
}
// Save in memory.
_blockMap[b.Hash] = s;
}
}
catch (ProtocolException e)
{
// Corrupted file.
throw new BlockStoreException(e);
}
catch (VerificationException e)
{
// Should not be able to happen unless the file contains bad blocks.
throw new BlockStoreException(e);
}
var elapsed = Environment.TickCount - now;
_log.InfoFormat("Block chain read complete in {0}ms", elapsed);
}
}
/// <exception cref="BlockStoreException"/>
private void CreateNewStore(NetworkParameters @params, FileInfo file)
{
// Create a new block store if the file wasn't found or anything went wrong whilst reading.
_blockMap.Clear();
try
{
if (_stream != null)
{
_stream.Dispose();
}
_stream = file.OpenWrite(); // Do not append, create fresh.
_stream.Write(1); // Version.
}
catch (IOException e1)
{
// We could not load a block store nor could we create a new one!
throw new BlockStoreException(e1);
}
try
{
// Set up the genesis block. When we start out fresh, it is by definition the top of the chain.
var genesis = @params.GenesisBlock.CloneAsHeader();
var storedGenesis = new StoredBlock(genesis, genesis.GetWork(), 0);
_chainHead = storedGenesis.BlockHeader.Hash;
_stream.Write(_chainHead.Bytes);
Put(storedGenesis);
}
catch (IOException e)
{
throw new BlockStoreException(e);
}
}
/// <exception cref="BlockStoreException"/>
public void SetChainHead(StoredBlock chainHead)
{
lock (this)
{
try
{
_chainHead = chainHead.BlockHeader.Hash;
// Write out new hash to the first 32 bytes of the file past one (first byte is version number).
_stream.Seek(1, SeekOrigin.Begin);
var bytes = _chainHead.Bytes;
_stream.Write(bytes, 0, bytes.Length);
}
catch (IOException e)
{
throw new BlockStoreException(e);
}
}
}
