/// <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="BitcoinSharp.Blockchain.Store.BlockStoreException" />
/// <exception cref="VerificationException" />
/// <exception cref="ScriptException" />
private bool Add(Block block, bool tryConnecting)
{
lock (this)
{
if (Environment.TickCount - _statsLastTime > 1000)
{
// More than a second passed since last stats logging.
Log.InfoFormat("{0} blocks per second", _statsBlocksAdded);
_statsLastTime = Environment.TickCount;
_statsBlocksAdded = 0;
}
// We check only the chain head for double adds here to avoid potentially expensive block chain misses.
if (block.Equals(_chainHead.BlockHeader))
{
// Duplicate add of the block at the top of the chain, can be a natural artifact of the download process.
return true;
}
// Does this block contain any transactions we might care about? Check this up front before verifying the
// blocks validity so we can skip the merkle root verification if the contents aren't interesting. This saves
// a lot of time for big blocks.
var contentsImportant = false;
var walletToTransactionMap = new Dictionary<IDefaultWallet, List<Transaction>>();
if (block.Transactions != null)
{
ScanTransactions(block, walletToTransactionMap);
contentsImportant = walletToTransactionMap.Count > 0;
}
// Prove the block is internally valid: hash is lower than target, etc. This only checks the block contents
// if there is a tx sending or receiving coins using an address in one of our wallets. And those transactions
// are only lightly verified: presence in a valid connecting block is taken as proof of validity. See the
// article here for more details: http://code.google.com/p/bitcoinj/wiki/SecurityModel
try
{
block.VerifyHeader();
if (contentsImportant)
block.VerifyTransactions();
}
catch (VerificationException e)
{
Log.Error("Failed to verify block:", e);
Log.Error(block.HashAsString);
throw;
}
// Try linking it to a place in the currently known blocks.
var previousStoredBlock = _blockStore.Get(block.PreviousBlockHash);
if (previousStoredBlock == null)
{
// We can't find the previous block. Probably we are still in the process of downloading the chain and a
// block was solved whilst we were doing it. We put it to one side and try to connect it later when we
// have more blocks.
Log.WarnFormat("Block does not connect: {0}", block.HashAsString);
_unconnectedBlocks.Add(block);
return false;
}
// It connects to somewhere on the chain. Not necessarily the top of the best known chain.
//
// Create a new StoredBlock from this block. It will throw away the transaction data so when block goes
// out of scope we will reclaim the used memory.
var newStoredBlock = previousStoredBlock.Build(block);
CheckDifficultyTransitions(previousStoredBlock, newStoredBlock);
_blockStore.Put(newStoredBlock);
ConnectBlock(newStoredBlock, previousStoredBlock, walletToTransactionMap);
if (tryConnecting)
TryConnectingUnconnected();
_statsBlocksAdded++;
return true;
}
}