\feffusing System;
using System.IO;
using System.Linq;
+using System.Collections.Concurrent;
using SQLite.Net;
using SQLite.Net.Attributes;
using SQLite.Net.Interop;
using SQLite.Net.Platform.Generic;
+using SQLiteNetExtensions.Attributes;
+using System.Collections.Generic;
namespace Novacoin
{
+ /// <summary>
+ /// Block headers table
+ /// </summary>
[Table("BlockStorage")]
class CBlockStoreItem
{
/// PBKDF2+Salsa20 of block hash
/// </summary>
[Unique]
- public byte[] ScryptHash { get; set; }
+ public byte[] Hash { get; set; }
/// <summary>
- /// Serialized representation of block header
+ /// Version of block schema
/// </summary>
- public byte[] BlockHeader { get; set; }
+ public uint nVersion { get; set; }
+
+ /// <summary>
+ /// Previous block hash.
+ /// </summary>
+ public byte[] prevHash { get; set; }
+
+ /// <summary>
+ /// Merkle root hash.
+ /// </summary>
+ public byte[] merkleRoot { get; set; }
+
+ /// <summary>
+ /// Block timestamp.
+ /// </summary>
+ public uint nTime { get; set; }
+
+ /// <summary>
+ /// Compressed difficulty representation.
+ /// </summary>
+ public uint nBits { get; set; }
+
+ /// <summary>
+ /// Nonce counter.
+ /// </summary>
+ public uint nNonce { get; set; }
+
+ /// <summary>
+ /// Block type flags
+ /// </summary>
+ public BlockType BlockTypeFlag { get; set; }
+
+ /// <summary>
+ /// Stake modifier
+ /// </summary>
+ public long nStakeModifier { get; set; }
+
+ /// <summary>
+ /// Stake entropy bit
+ /// </summary>
+ public byte nEntropyBit { get; set; }
+
+ /// <summary>
+ /// Next block hash
+ /// </summary>
+ public byte[] NextHash { get; set; }
+
+ /// <summary>
+ /// Block height
+ /// </summary>
+ public uint nHeight { get; set; }
/// <summary>
/// Block position in file
/// Block size in bytes
/// </summary>
public int nBlockSize { get; set; }
+
+ /// <summary>
+ /// Fill database item with data from given block header.
+ /// </summary>
+ /// <param name="header">Block header</param>
+ /// <returns>Header hash</returns>
+ public ScryptHash256 FillHeader(CBlockHeader header)
+ {
+ ScryptHash256 _hash;
+ Hash = _hash = header.Hash;
+
+ nVersion = header.nVersion;
+ prevHash = header.prevHash;
+ merkleRoot = header.merkleRoot;
+ nTime = header.nTime;
+ nBits = header.nBits;
+ nNonce = header.nNonce;
+
+ return _hash;
+ }
+
+ /// <summary>
+ /// Reconstruct block header from item data.
+ /// </summary>
+ public CBlockHeader BlockHeader
+ {
+ get
+ {
+ CBlockHeader header = new CBlockHeader();
+
+ header.nVersion = nVersion;
+ header.prevHash = new ScryptHash256(prevHash);
+ header.merkleRoot = new Hash256(merkleRoot);
+ header.nTime = nTime;
+ header.nBits = nBits;
+ header.nNonce = nNonce;
+
+ return header;
+ }
+ }
+
+ /// <summary>
+ /// Read block from file.
+ /// </summary>
+ /// <param name="reader">Stream with read access.</param>
+ /// <param name="reader">CBlock reference.</param>
+ /// <returns>Result</returns>
+ public bool ReadFromFile(ref Stream reader, out CBlock block)
+ {
+ var buffer = new byte[nBlockSize];
+ block = null;
+
+ try
+ {
+ reader.Seek(nBlockPos, SeekOrigin.Begin);
+
+ if (nBlockSize != reader.Read(buffer, 0, nBlockSize))
+ {
+ return false;
+ }
+
+ block = new CBlock(buffer);
+
+ return true;
+ }
+ catch (IOException)
+ {
+ // I/O error
+ return false;
+ }
+ catch (BlockException)
+ {
+ // Constructor exception
+ return false;
+ }
+ }
+
+ /// <summary>
+ /// Writes given block to file and prepares cursor object for insertion into the database.
+ /// </summary>
+ /// <param name="writer">Stream with write access.</param>
+ /// <param name="block">CBlock reference.</param>
+ /// <returns>Result</returns>
+ public bool WriteToFile(ref Stream writer, ref CBlock block)
+ {
+ try
+ {
+ byte[] blockBytes = block;
+
+ var magicBytes = BitConverter.GetBytes(CBlockStore.nMagicNumber);
+ var blkLenBytes = BitConverter.GetBytes(blockBytes.Length);
+
+ // Seek to the end and then append magic bytes there.
+ writer.Seek(0, SeekOrigin.End);
+ writer.Write(magicBytes, 0, magicBytes.Length);
+
+ // Save block size and current position in the block cursor fields.
+ nBlockPos = writer.Position;
+ nBlockSize = blockBytes.Length;
+
+ // Write block and flush the stream.
+ writer.Write(blkLenBytes, 0, blkLenBytes.Length);
+ writer.Write(blockBytes, 0, blockBytes.Length);
+ writer.Flush();
+
+ return true;
+ }
+ catch (IOException)
+ {
+ // I/O error
+ return false;
+ }
+ catch (Exception)
+ {
+ // Some serialization error
+ return false;
+ }
+ }
+ }
+
+ /// <summary>
+ /// Block type.
+ /// </summary>
+ public enum BlockType
+ {
+ PROOF_OF_WORK,
+ PROOF_OF_WORK_MODIFIER,
+ PROOF_OF_STAKE,
+ PROOF_OF_STAKE_MODIFIER
+ };
+
+ /// <summary>
+ /// Transaction type.
+ /// </summary>
+ public enum TxType
+ {
+ TX_COINBASE,
+ TX_COINSTAKE,
+ TX_USER
+ }
+
+ [Table("TransactionStorage")]
+ public class CTransactionStoreItem
+ {
+ /// <summary>
+ /// Transaction hash
+ /// </summary>
+ [PrimaryKey]
+ public byte[] TransactionHash { get; set; }
+
+ /// <summary>
+ /// Block hash
+ /// </summary>
+ [ForeignKey(typeof(CBlockStoreItem), Name = "Hash")]
+ public byte[] BlockHash { get; set; }
+
+ /// <summary>
+ /// Transaction type flag
+ /// </summary>
+ public TxType txType { get; set; }
+
+ /// <summary>
+ /// Tx position in file
+ /// </summary>
+ public long nTxPos { get; set; }
+
+ /// <summary>
+ /// Transaction size
+ /// </summary>
+ public int nTxSize { get; set; }
+
+ /// <summary>
+ /// Read transaction from file.
+ /// </summary>
+ /// <param name="reader">Stream with read access.</param>
+ /// <param name="tx">CTransaction reference.</param>
+ /// <returns>Result</returns>
+ public bool ReadFromFile(ref Stream reader, out CTransaction tx)
+ {
+ var buffer = new byte[250000]; // Max transaction size is 250kB
+ tx = null;
+
+ try
+ {
+ reader.Seek(nTxPos, SeekOrigin.Begin); // Seek to transaction offset
+
+ if (nTxSize != reader.Read(buffer, 0, nTxSize))
+ {
+ return false;
+ }
+
+ tx = new CTransaction(buffer);
+
+ return true;
+ }
+ catch (IOException)
+ {
+ // I/O error
+ return false;
+ }
+ catch (TransactionConstructorException)
+ {
+ // Constructor error
+ return false;
+ }
+ }
}
public class CBlockStore : IDisposable
{
+ public const uint nMagicNumber = 0xe5e9e8e4;
+
private bool disposed = false;
private object LockObj = new object();
- private SQLiteConnection dbConn = null;
-
+
+ /// <summary>
+ /// SQLite connection object.
+ /// </summary>
+ private SQLiteConnection dbConn;
+
+ /// <summary>
+ /// Block file.
+ /// </summary>
+ private string strBlockFile;
+
+ /// <summary>
+ /// Index database file.
+ /// </summary>
+ private string strDbFile;
+
+ /// <summary>
+ /// Map of block tree nodes.
+ /// </summary>
+ private ConcurrentDictionary<ScryptHash256, CBlockStoreItem> blockMap = new ConcurrentDictionary<ScryptHash256, CBlockStoreItem>();
+
+ /// <summary>
+ /// Orphaned blocks map.
+ /// </summary>
+ private ConcurrentDictionary<ScryptHash256, CBlock> orphanMap = new ConcurrentDictionary<ScryptHash256, CBlock>();
+ private ConcurrentDictionary<ScryptHash256, CBlock> orphanMapByPrev = new ConcurrentDictionary<ScryptHash256, CBlock>();
+
+ /// <summary>
+ /// Map of unspent items.
+ /// </summary>
+ private ConcurrentDictionary<Hash256, CTransactionStoreItem> txMap = new ConcurrentDictionary<Hash256, CTransactionStoreItem>();
+
+ private CBlock genesisBlock = new CBlock(
+ Interop.HexToArray(
+ "01000000" + // nVersion=1
+ "0000000000000000000000000000000000000000000000000000000000000000" + // prevhash is zero
+ "7b0502ad2f9f675528183f83d6385794fbcaa914e6d385c6cb1d866a3b3bb34c" + // merkle root
+ "398e1151" + // nTime=1360105017
+ "ffff0f1e" + // nBits=0x1e0fffff
+ "d3091800" + // nNonce=1575379
+ "01" + // nTxCount=1
+ "01000000" + // nVersion=1
+ "398e1151" + // nTime=1360105017
+ "01" + // nInputs=1
+ "0000000000000000000000000000000000000000000000000000000000000000" + // input txid is zero
+ "ffffffff" + // n=uint.maxValue
+ "4d" + // scriptSigLen=77
+ "04ffff001d020f274468747470733a2f2f626974636f696e74616c6b2e6f72672f696e6465782e7068703f746f7069633d3133343137392e6d736731353032313936236d736731353032313936" + // scriptSig
+ "ffffffff" + // nSequence=uint.maxValue
+ "01" + // nOutputs=1
+ "0000000000000000" + // nValue=0
+ "00" + // scriptPubkeyLen=0
+ "00000000" + // nLockTime=0
+ "00" // sigLen=0
+ ));
+
+ public static CBlockStore Instance;
+
+ /// <summary>
+ /// Block file stream with read access
+ /// </summary>
+ private Stream fStreamReadWrite;
+
/// <summary>
/// Init the block storage manager.
/// </summary>
/// <param name="BlockFile">Path to block file</param>
public CBlockStore(string IndexDB = "blockstore.dat", string BlockFile = "blk0001.dat")
{
- bool firstInit = !File.Exists(IndexDB);
- dbConn = new SQLiteConnection(new SQLitePlatformGeneric(), IndexDB);
+ strDbFile = IndexDB;
+ strBlockFile = BlockFile;
+
+ bool firstInit = !File.Exists(strDbFile);
+ dbConn = new SQLiteConnection(new SQLitePlatformGeneric(), strDbFile);
+
+ fStreamReadWrite = File.Open(strBlockFile, FileMode.OpenOrCreate, FileAccess.ReadWrite);
if (firstInit)
{
lock (LockObj)
{
+ // Create tables
dbConn.CreateTable<CBlockStoreItem>(CreateFlags.AutoIncPK);
+ dbConn.CreateTable<CTransactionStoreItem>(CreateFlags.ImplicitPK);
+
+ // Write block to file.
+ var itemTemplate = new CBlockStoreItem()
+ {
+ nHeight = 0
+ };
+
+ itemTemplate.FillHeader(genesisBlock.header);
+
+ if (!AddItemToIndex(ref itemTemplate, ref genesisBlock))
+ {
+ throw new Exception("Unable to write genesis block");
+ }
}
}
+ else
+ {
+ var blockTreeItems = dbConn.Query<CBlockStoreItem>("select * from [BlockStorage] order by [ItemId] asc");
+
+ // Init list of block items
+ foreach (var item in blockTreeItems)
+ {
+ blockMap.TryAdd(new ScryptHash256(item.Hash), item);
+ }
+ }
+
+ Instance = this;
}
- public bool ParseBlockFile(string BlockFile = "bootstrap.dat")
+ public bool GetTransaction(Hash256 TxID, ref CTransaction tx)
{
- // TODO: Rewrite completely.
+ var reader = new BinaryReader(fStreamReadWrite).BaseStream;
+ var QueryTx = dbConn.Query<CTransactionStoreItem>("select * from [TransactionStorage] where [TransactionHash] = ?", (byte[])TxID);
+
+ if (QueryTx.Count == 1)
+ {
+ return QueryTx[0].ReadFromFile(ref reader, out tx);
+ }
- var QueryGet = dbConn.Query<CBlockStoreItem>("select * from [BlockStorage] order by [ItemId] desc limit 1");
+ // Tx not found
- var nOffset = 0L;
+ return false;
+ }
+
+ private bool AddItemToIndex(ref CBlockStoreItem itemTemplate, ref CBlock block)
+ {
+ var writer = new BinaryWriter(fStreamReadWrite).BaseStream;
+ var blockHash = new ScryptHash256(itemTemplate.Hash);
+
+ if (blockMap.ContainsKey(blockHash))
+ {
+ // Already have this block.
+ return false;
+ }
+
+ // TODO: compute chain trust, set stake entropy bit, record proof-of-stake hash value
+
+ // TODO: compute stake modifier
+
+ // Add to index
+ itemTemplate.BlockTypeFlag = block.IsProofOfStake ? BlockType.PROOF_OF_STAKE : BlockType.PROOF_OF_WORK;
+
+ if (!itemTemplate.WriteToFile(ref writer, ref block))
+ {
+ return false;
+ }
+
+ dbConn.Insert(itemTemplate);
+
+ // We have no SetBestChain and ConnectBlock/Disconnect block yet, so adding these transactions manually.
+ for (int i = 0; i < block.vtx.Length; i++)
+ {
+ // Handle trasactions
+
+ if (!block.vtx[i].VerifyScripts())
+ {
+ return false;
+ }
+
+ var nTxOffset = itemTemplate.nBlockPos + block.GetTxOffset(i);
+ TxType txnType = TxType.TX_USER;
+
+ if (block.vtx[i].IsCoinBase)
+ {
+ txnType = TxType.TX_COINBASE;
+ }
+ else if (block.vtx[i].IsCoinStake)
+ {
+ txnType = TxType.TX_COINSTAKE;
+ }
+
+ var NewTxItem = new CTransactionStoreItem()
+ {
+ TransactionHash = block.vtx[i].Hash,
+ BlockHash = blockHash,
+ nTxPos = nTxOffset,
+ nTxSize = block.vtx[i].Size,
+ txType = txnType
+ };
+
+ dbConn.Insert(NewTxItem);
+ }
+
+ return blockMap.TryAdd(blockHash, itemTemplate);
+ }
+
+ public bool AcceptBlock(ref CBlock block)
+ {
+ ScryptHash256 hash = block.header.Hash;
+
+ if (blockMap.ContainsKey(hash))
+ {
+ // Already have this block.
+ return false;
+ }
+
+ CBlockStoreItem prevBlockCursor = null;
+ if (!blockMap.TryGetValue(block.header.prevHash, out prevBlockCursor))
+ {
+ // Unable to get the cursor.
+ return false;
+ }
+
+ var prevBlockHeader = prevBlockCursor.BlockHeader;
+
+ // TODO: proof-of-work/proof-of-stake verification
+ uint nHeight = prevBlockCursor.nHeight + 1;
+
+ // Check timestamp against prev
+ if (NetUtils.FutureDrift(block.header.nTime) < prevBlockHeader.nTime)
+ {
+ // block's timestamp is too early
+ return false;
+ }
+
+ // Check that all transactions are finalized
+ foreach (var tx in block.vtx)
+ {
+ if (!tx.IsFinal(nHeight, block.header.nTime))
+ {
+ return false;
+ }
+ }
+
+ // TODO: Enforce rule that the coinbase starts with serialized block height
- if (QueryGet.Count() == 1)
+ // Write block to file.
+ var itemTemplate = new CBlockStoreItem()
{
- var res = QueryGet.First();
- nOffset = res.nBlockPos + res.nBlockSize;
+ nHeight = nHeight
+ };
+
+ itemTemplate.FillHeader(block.header);
+
+ if (!AddItemToIndex(ref itemTemplate, ref block))
+ {
+ return false;
+ }
+
+ return true;
+ }
+
+ public bool GetBlock(ScryptHash256 blockHash, ref CBlock block)
+ {
+ var reader = new BinaryReader(fStreamReadWrite).BaseStream;
+
+ var QueryBlock = dbConn.Query<CBlockStoreItem>("select * from [BlockStorage] where [Hash] = ?", (byte[])blockHash);
+
+ if (QueryBlock.Count == 1)
+ {
+ return QueryBlock[0].ReadFromFile(ref reader, out block);
+ }
+
+ // Block not found
+
+ return false;
+ }
+
+ public bool ProcessBlock(ref CBlock block)
+ {
+ ScryptHash256 blockHash = block.header.Hash;
+
+ if (blockMap.ContainsKey(blockHash))
+ {
+ // We already have this block.
+ return false;
+ }
+
+ if (orphanMap.ContainsKey(blockHash))
+ {
+ // We already have block in the list of orphans.
+ return false;
+ }
+
+ // TODO: Limited duplicity on stake and reserialization of block signature
+
+ // Preliminary checks
+ if (!block.CheckBlock(true, true, true))
+ {
+ return true;
+ }
+
+ if (block.IsProofOfStake)
+ {
+ // TODO: proof-of-stake validation
+ }
+
+ // TODO: difficulty verification
+
+ // If don't already have its previous block, shunt it off to holding area until we get it
+ if (!blockMap.ContainsKey(block.header.prevHash))
+ {
+ if (block.IsProofOfStake)
+ {
+ // TODO: limit duplicity on stake
+ }
+
+ var block2 = new CBlock(block);
+ orphanMap.TryAdd(blockHash, block2);
+ orphanMapByPrev.TryAdd(blockHash, block2);
+
+ return true;
}
- var fileReader = new BinaryReader(File.OpenRead(BlockFile));
- var fileStream = fileReader.BaseStream;
+ // Store block to disk
+ if (!AcceptBlock(ref block))
+ {
+ // Accept failed
+ return false;
+ }
+
+ // Recursively process any orphan blocks that depended on this one
+ var orphansQueue = new List<ScryptHash256>();
+ orphansQueue.Add(blockHash);
+
+ for (int i = 0; i < orphansQueue.Count; i++)
+ {
+ ScryptHash256 hashPrev = orphansQueue[i];
+
+ foreach (var pair in orphanMap)
+ {
+ var orphanBlock = pair.Value;
+
+ if (orphanBlock.header.prevHash == blockHash)
+ {
+ if (AcceptBlock(ref orphanBlock))
+ {
+ orphansQueue.Add(pair.Key);
+ }
+
+ CBlock dummy1;
+ orphanMap.TryRemove(pair.Key, out dummy1);
+ }
+ }
+
+ CBlock dummy2;
+ orphanMap.TryRemove(hashPrev, out dummy2);
+ }
+
+ return true;
+ }
+
+ public bool ParseBlockFile(string BlockFile = "bootstrap.dat")
+ {
+ // TODO: Rewrite completely.
+
+ var nOffset = 0L;
var buffer = new byte[1000000]; // Max block size is 1Mb
var intBuffer = new byte[4];
- fileStream.Seek(nOffset, SeekOrigin.Begin); // Seek to previous offset + previous block length
+ var fStream2 = File.OpenRead(BlockFile);
+ var readerForBlocks = new BinaryReader(fStream2).BaseStream;
+
+ readerForBlocks.Seek(nOffset, SeekOrigin.Begin); // Seek to previous offset + previous block length
dbConn.BeginTransaction();
- while (fileStream.Read(buffer, 0, 4) == 4) // Read magic number
+ while (readerForBlocks.Read(buffer, 0, 4) == 4) // Read magic number
{
var nMagic = BitConverter.ToUInt32(buffer, 0);
if (nMagic != 0xe5e9e8e4)
{
- Console.WriteLine("Incorrect magic number.");
- break;
+ throw new Exception("Incorrect magic number.");
}
- var nBytesRead = fileStream.Read(buffer, 0, 4);
+ var nBytesRead = readerForBlocks.Read(buffer, 0, 4);
if (nBytesRead != 4)
{
- Console.WriteLine("BLKSZ EOF");
- break;
+ throw new Exception("BLKSZ EOF");
}
var nBlockSize = BitConverter.ToInt32(buffer, 0);
- nOffset = fileStream.Position;
+ nOffset = readerForBlocks.Position;
- nBytesRead = fileStream.Read(buffer, 0, nBlockSize);
+ nBytesRead = readerForBlocks.Read(buffer, 0, nBlockSize);
if (nBytesRead == 0 || nBytesRead != nBlockSize)
{
- Console.WriteLine("BLK EOF");
- break;
+ throw new Exception("BLK EOF");
}
var block = new CBlock(buffer);
+ var hash = block.header.Hash;
- if (nOffset % 1000 == 0) // Commit on each 1000th block
+ if (blockMap.ContainsKey(hash))
{
- Console.WriteLine("Offset={0}, Hash: {1}", nOffset, block.header.Hash.ToString());
- dbConn.Commit();
- dbConn.BeginTransaction();
+ continue;
}
- var result = dbConn.Insert(new CBlockStoreItem()
+ if (!ProcessBlock(ref block))
{
- ScryptHash = block.header.Hash,
- BlockHeader = block.header,
- nBlockPos = nOffset,
- nBlockSize = nBlockSize
- });
+ throw new Exception("Invalid block: " + block.header.Hash);
+ }
+
+ int nCount = blockMap.Count;
+ Console.WriteLine("nCount={0}, Hash={1}, Time={2}", nCount, block.header.Hash, DateTime.Now); // Commit on each 100th block
+
+ if (nCount % 100 == 0 && nCount != 0)
+ {
+ Console.WriteLine("Commit...");
+ dbConn.Commit();
+ dbConn.BeginTransaction();
+ }
}
dbConn.Commit();
-
- fileReader.Dispose();
return true;
}
if (disposing)
{
// Free other state (managed objects).
+
+ fStreamReadWrite.Dispose();
}
if (dbConn != null)
git://git.novaco.in / NovacoinLibrary.git / blobdiff