-\feffusing System;
+\feff/**
+* Novacoin classes library
+* Copyright (C) 2015 Alex D. (balthazar.ad@gmail.com)
+
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Affero General Public License as
+* published by the Free Software Foundation, either version 3 of the
+* License, or (at your option) any later version.
+
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU Affero General Public License for more details.
+
+* You should have received a copy of the GNU Affero General Public License
+* along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+using System;
using System.IO;
using System.Linq;
using System.Collections.Concurrent;
using SQLite.Net.Platform.Generic;
using SQLiteNetExtensions.Attributes;
using System.Collections.Generic;
+using System.Diagnostics.Contracts;
+using System.Text;
namespace Novacoin
{
- /// <summary>
- /// Block headers table
- /// </summary>
[Table("BlockStorage")]
- class CBlockStoreItem
+ public class CBlockStoreItem : IBlockStorageItem
{
+ #region IBlockStorageItem
/// <summary>
/// Item ID in the database
/// </summary>
[PrimaryKey, AutoIncrement]
- public int ItemID { get; set; }
+ public long ItemID { get; set; }
/// <summary>
/// PBKDF2+Salsa20 of block hash
/// <summary>
/// Version of block schema
/// </summary>
+ [Column("nVersion")]
public uint nVersion { get; set; }
/// <summary>
/// Previous block hash.
/// </summary>
+ [Column("prevHash")]
public byte[] prevHash { get; set; }
/// <summary>
/// Merkle root hash.
/// </summary>
+ [Column("merkleRoot")]
public byte[] merkleRoot { get; set; }
/// <summary>
/// Block timestamp.
/// </summary>
+ [Column("nTime")]
public uint nTime { get; set; }
/// <summary>
/// Compressed difficulty representation.
/// </summary>
+ [Column("nBits")]
public uint nBits { get; set; }
/// <summary>
/// Nonce counter.
/// </summary>
+ [Column("nNonce")]
public uint nNonce { get; set; }
/// <summary>
+ /// Next block hash.
+ /// </summary>
+ [Column("nextHash")]
+ public byte[] nextHash { get; set; }
+
+ /// <summary>
/// Block type flags
/// </summary>
+ [Column("BlockTypeFlag")]
public BlockType BlockTypeFlag { get; set; }
/// <summary>
/// Stake modifier
/// </summary>
+ [Column("nStakeModifier")]
public long nStakeModifier { get; set; }
/// <summary>
- /// Stake entropy bit
+ /// Proof-of-Stake hash
+ /// </summary>
+ [Column("hashProofOfStake")]
+ public byte[] hashProofOfStake { get; set; }
+
+ /// <summary>
+ /// Stake generation outpoint.
/// </summary>
- public byte nEntropyBit { get; set; }
+ [Column("prevoutStake")]
+ public byte[] prevoutStake { get; set; }
/// <summary>
- /// Next block hash
+ /// Stake generation time.
/// </summary>
- public byte[] NextHash { get; set; }
+ [Column("nStakeTime")]
+ public uint nStakeTime { get; set; }
/// <summary>
- /// Block height
+ /// Block height, encoded in VarInt format
/// </summary>
+ [Column("nHeight")]
public uint nHeight { get; set; }
/// <summary>
- /// Block position in file
+ /// Chain trust score, serialized and trimmed uint256 representation.
/// </summary>
- public long nBlockPos { get; set; }
+ [Column("ChainTrust")]
+ public byte[] ChainTrust { get; set; }
/// <summary>
- /// Block size in bytes
+ /// Block position in file, encoded in VarInt format
/// </summary>
- public int nBlockSize { get; set; }
+ [Column("BlockPos")]
+ public byte[] BlockPos { get; set; }
+
+ /// <summary>
+ /// Block size in bytes, encoded in VarInt format
+ /// </summary>
+ [Column("BlockSize")]
+ public byte[] BlockSize { get; set; }
+ #endregion
+
+ /// <summary>
+ /// Accessor and mutator for BlockPos value.
+ /// </summary>
+ [Ignore]
+ public long nBlockPos
+ {
+ get { return (long)VarInt.DecodeVarInt(BlockPos); }
+ set { BlockPos = VarInt.EncodeVarInt(value); }
+ }
+
+ /// <summary>
+ /// Accessor and mutator for BlockSize value.
+ /// </summary>
+ [Ignore]
+ public int nBlockSize
+ {
+ get { return (int)VarInt.DecodeVarInt(BlockSize); }
+ set { BlockSize = VarInt.EncodeVarInt(value); }
+ }
/// <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)
+ public uint256 FillHeader(CBlockHeader header)
{
- ScryptHash256 _hash;
- Hash = _hash = header.Hash;
+ uint256 _hash = header.Hash;
+
+ Hash = _hash;
nVersion = header.nVersion;
prevHash = header.prevHash;
CBlockHeader header = new CBlockHeader();
header.nVersion = nVersion;
- header.prevHash = new ScryptHash256(prevHash);
- header.merkleRoot = new Hash256(merkleRoot);
+ header.prevHash = prevHash;
+ header.merkleRoot = merkleRoot;
header.nTime = nTime;
header.nBits = nBits;
header.nNonce = nNonce;
return false;
}
}
+
+ /// <summary>
+ /// Previous block cursor
+ /// </summary>
+ [Ignore]
+ public CBlockStoreItem prev {
+ get { return CBlockStore.Instance.GetCursor(prevHash); }
+ }
+
+ /// <summary>
+ /// Next block cursor
+ /// </summary>
+ [Ignore]
+ public CBlockStoreItem next
+ {
+ get
+ {
+ if (nextHash == null)
+ {
+ return null;
+ }
+
+ return CBlockStore.Instance.GetCursor(nextHash);
+ }
+ set
+ {
+ CBlockStoreItem newCursor = this;
+ newCursor.nextHash = value.Hash;
+
+ CBlockStore.Instance.UpdateCursor(this, ref newCursor);
+ }
+ }
+
+ [Ignore]
+ bool IsInMainChain
+ {
+ get { return (next != null); }
+ }
+
+ /// <summary>
+ /// STake modifier generation flag
+ /// </summary>
+ [Ignore]
+ public bool GeneratedStakeModifier
+ {
+ get { return (BlockTypeFlag & BlockType.BLOCK_STAKE_MODIFIER) != 0; }
+ }
+
+ /// <summary>
+ /// Stake entropy bit
+ /// </summary>
+ [Ignore]
+ public uint StakeEntropyBit
+ {
+ get { return ((uint)(BlockTypeFlag & BlockType.BLOCK_STAKE_ENTROPY) >> 1); }
+ }
+
+ /// <summary>
+ /// Sets stake modifier and flag.
+ /// </summary>
+ /// <param name="nModifier">New stake modifier.</param>
+ /// <param name="fGeneratedStakeModifier">Set generation flag?</param>
+ public void SetStakeModifier(long nModifier, bool fGeneratedStakeModifier)
+ {
+ nStakeModifier = nModifier;
+ if (fGeneratedStakeModifier)
+ BlockTypeFlag |= BlockType.BLOCK_STAKE_MODIFIER;
+ }
+
+ /// <summary>
+ /// Set entropy bit.
+ /// </summary>
+ /// <param name="nEntropyBit">Entropy bit value (0 or 1).</param>
+ /// <returns>False if value is our of range.</returns>
+ public bool SetStakeEntropyBit(byte nEntropyBit)
+ {
+ if (nEntropyBit > 1)
+ return false;
+ BlockTypeFlag |= (nEntropyBit != 0 ? BlockType.BLOCK_STAKE_ENTROPY : 0);
+ return true;
+ }
+
+ /// <summary>
+ /// Set proof-of-stake flag.
+ /// </summary>
+ public void SetProofOfStake()
+ {
+ BlockTypeFlag |= BlockType.BLOCK_PROOF_OF_STAKE;
+ }
+
+ /// <summary>
+ /// Block has no proof-of-stake flag.
+ /// </summary>
+ [Ignore]
+ public bool IsProofOfWork
+ {
+ get { return (BlockTypeFlag & BlockType.BLOCK_PROOF_OF_STAKE) == 0; }
+ }
+
+ /// <summary>
+ /// Block has proof-of-stake flag set.
+ /// </summary>
+ [Ignore]
+ public bool IsProofOfStake
+ {
+ get { return (BlockTypeFlag & BlockType.BLOCK_PROOF_OF_STAKE) != 0; }
+ }
+
+ /// <summary>
+ /// Block trust score.
+ /// </summary>
+ [Ignore]
+ public uint256 nBlockTrust
+ {
+ get
+ {
+ uint256 nTarget = 0;
+ nTarget.Compact = nBits;
+
+ /* Old protocol */
+ if (nTime < NetUtils.nChainChecksSwitchTime)
+ {
+ return IsProofOfStake ? (new uint256(1) << 256) / (nTarget + 1) : 1;
+ }
+
+ /* New protocol */
+
+ // Calculate work amount for block
+ var nPoWTrust = NetUtils.nPoWBase / (nTarget + 1);
+
+ // Set nPowTrust to 1 if we are checking PoS block or PoW difficulty is too low
+ nPoWTrust = (IsProofOfStake || !nPoWTrust) ? 1 : nPoWTrust;
+
+ // Return nPoWTrust for the first 12 blocks
+ if (prev == null || prev.nHeight < 12)
+ return nPoWTrust;
+
+ CBlockStoreItem currentIndex = prev;
+
+ if (IsProofOfStake)
+ {
+ var nNewTrust = (new uint256(1) << 256) / (nTarget + 1);
+
+ // Return 1/3 of score if parent block is not the PoW block
+ if (!prev.IsProofOfWork)
+ {
+ return nNewTrust / 3;
+ }
+
+ int nPoWCount = 0;
+
+ // Check last 12 blocks type
+ while (prev.nHeight - currentIndex.nHeight < 12)
+ {
+ if (currentIndex.IsProofOfWork)
+ {
+ nPoWCount++;
+ }
+ currentIndex = currentIndex.prev;
+ }
+
+ // Return 1/3 of score if less than 3 PoW blocks found
+ if (nPoWCount < 3)
+ {
+ return nNewTrust / 3;
+ }
+
+ return nNewTrust;
+ }
+ else
+ {
+ var nLastBlockTrust = prev.nChainTrust - prev.prev.nChainTrust;
+
+ // Return nPoWTrust + 2/3 of previous block score if two parent blocks are not PoS blocks
+ if (!prev.IsProofOfStake || !prev.prev.IsProofOfStake)
+ {
+ return nPoWTrust + (2 * nLastBlockTrust / 3);
+ }
+
+ int nPoSCount = 0;
+
+ // Check last 12 blocks type
+ while (prev.nHeight - currentIndex.nHeight < 12)
+ {
+ if (currentIndex.IsProofOfStake)
+ {
+ nPoSCount++;
+ }
+ currentIndex = currentIndex.prev;
+ }
+
+ // Return nPoWTrust + 2/3 of previous block score if less than 7 PoS blocks found
+ if (nPoSCount < 7)
+ {
+ return nPoWTrust + (2 * nLastBlockTrust / 3);
+ }
+
+ nTarget.Compact = prev.nBits;
+
+ if (!nTarget)
+ {
+ return 0;
+ }
+
+ var nNewTrust = (new uint256(1) << 256) / (nTarget + 1);
+
+ // Return nPoWTrust + full trust score for previous block nBits
+ return nPoWTrust + nNewTrust;
+ }
+ }
+ }
+
+ /// <summary>
+ /// Stake modifier checksum.
+ /// </summary>
+ public uint nStakeModifierChecksum;
+
+ /// <summary>
+ /// Chain trust score
+ /// </summary>
+ [Ignore]
+ public uint256 nChainTrust {
+ get { return Interop.AppendWithZeros(ChainTrust); }
+ set { ChainTrust = Interop.TrimArray(value); }
+ }
}
/// <summary>
/// </summary>
public enum BlockType
{
- PROOF_OF_WORK,
- PROOF_OF_WORK_MODIFIER,
- PROOF_OF_STAKE,
- PROOF_OF_STAKE_MODIFIER
+ BLOCK_PROOF_OF_STAKE = (1 << 0), // is proof-of-stake block
+ BLOCK_STAKE_ENTROPY = (1 << 1), // entropy bit for stake modifier
+ BLOCK_STAKE_MODIFIER = (1 << 2), // regenerated stake modifier
};
/// <summary>
/// Transaction type.
/// </summary>
- public enum TxType
+ public enum TxFlags : byte
{
TX_COINBASE,
TX_COINSTAKE,
TX_USER
}
- [Table("TransactionStorage")]
- public class CTransactionStoreItem
+ /// <summary>
+ /// Output flags.
+ /// </summary>
+ public enum OutputFlags : byte
{
+ AVAILABLE, // Unspent output
+ SPENT // Spent output
+ }
+
+ [Table("MerkleNodes")]
+ public class CMerkleNode : IMerkleNode
+ {
+ #region IMerkleNode
/// <summary>
- /// Transaction hash
+ /// Node identifier
/// </summary>
- [PrimaryKey]
- public byte[] TransactionHash { get; set; }
+ [PrimaryKey, AutoIncrement]
+ public long nMerkleNodeID { get; set; }
/// <summary>
- /// Block hash
+ /// Reference to parent block database item.
/// </summary>
- [ForeignKey(typeof(CBlockStoreItem), Name = "Hash")]
- public byte[] BlockHash { get; set; }
+ [ForeignKey(typeof(CBlockStoreItem), Name = "ItemId")]
+ public long nParentBlockID { get; set; }
/// <summary>
/// Transaction type flag
/// </summary>
- public TxType txType { get; set; }
+ [Column("TransactionFlags")]
+ public TxFlags TransactionFlags { get; set; }
+
+ /// <summary>
+ /// Transaction hash
+ /// </summary>
+ [Column("TransactionHash")]
+ public byte[] TransactionHash { get; set; }
/// <summary>
- /// Tx position in file
+ /// Transaction offset from the beginning of block header, encoded in VarInt format.
/// </summary>
- public long nTxPos { get; set; }
+ [Column("TxOffset")]
+ public byte[] TxOffset { get; set; }
/// <summary>
- /// Transaction size
+ /// Transaction size, encoded in VarInt format.
/// </summary>
- public int nTxSize { get; set; }
+ [Column("TxSize")]
+ public byte[] TxSize { get; set; }
+ #endregion
/// <summary>
/// Read transaction from file.
/// <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)
+ public bool ReadFromFile(ref Stream reader, long nBlockPos, out CTransaction tx)
{
var buffer = new byte[CTransaction.nMaxTxSize];
+
tx = null;
try
{
- reader.Seek(nTxPos, SeekOrigin.Begin); // Seek to transaction offset
+ reader.Seek(nBlockPos + nTxOffset, SeekOrigin.Begin); // Seek to transaction offset
if (nTxSize != reader.Read(buffer, 0, nTxSize))
{
return false;
}
}
+
+ /// <summary>
+ /// Transaction offset accessor
+ /// </summary>
+ [Ignore]
+ public long nTxOffset
+ {
+ get { return (long) VarInt.DecodeVarInt(TxOffset); }
+ }
+
+ /// <summary>
+ /// Transaction size accessor
+ /// </summary>
+ [Ignore]
+ public int nTxSize
+ {
+ get { return (int)VarInt.DecodeVarInt(TxSize); }
+ }
+
+ }
+
+ [Table("Outputs")]
+ public class TxOutItem : ITxOutItem
+ {
+ /// <summary>
+ /// Reference to transaction item.
+ /// </summary>
+ [ForeignKey(typeof(CMerkleNode), Name = "nMerkleNodeID")]
+ public long nMerkleNodeID { get; set; }
+
+ /// <summary>
+ /// Output flags
+ /// </summary>
+ public OutputFlags outputFlags { get; set; }
+
+ /// <summary>
+ /// Output number in VarInt format.
+ /// </summary>
+ public byte[] OutputNumber { get; set; }
+
+ /// <summary>
+ /// Output value in VarInt format.
+ /// </summary>
+ public byte[] OutputValue { get; set; }
+
+ /// <summary>
+ /// Second half of script which contains spending instructions.
+ /// </summary>
+ public byte[] scriptPubKey { get; set; }
+
+ /// <summary>
+ /// Getter for output number.
+ /// </summary>
+ public uint nOut
+ {
+ get { return (uint)VarInt.DecodeVarInt(OutputNumber); }
+ }
+
+ /// <summary>
+ /// Getter for output value.
+ /// </summary>
+ public ulong nValue
+ {
+ get { return VarInt.DecodeVarInt(OutputValue); }
+ }
+
+ /// <summary>
+ /// Getter ans setter for IsSpent flag.
+ /// </summary>
+ public bool IsSpent
+ {
+ get { return (outputFlags & OutputFlags.SPENT) != 0; }
+ set { outputFlags |= value ? OutputFlags.SPENT : OutputFlags.AVAILABLE; }
+ }
}
public class CBlockStore : IDisposable
private SQLiteConnection dbConn;
/// <summary>
+ /// Current SQLite platform
+ /// </summary>
+ private ISQLitePlatform dbPlatform;
+
+ /// <summary>
/// Block file.
/// </summary>
private string strBlockFile;
/// <summary>
/// Map of block tree nodes.
+ ///
+ /// blockHash => CBlockStoreItem
/// </summary>
- private ConcurrentDictionary<ScryptHash256, CBlockStoreItem> blockMap = new ConcurrentDictionary<ScryptHash256, CBlockStoreItem>();
+ private ConcurrentDictionary<uint256, CBlockStoreItem> blockMap = new ConcurrentDictionary<uint256, CBlockStoreItem>();
/// <summary>
/// Orphaned blocks map.
/// </summary>
- private ConcurrentDictionary<ScryptHash256, CBlock> orphanMap = new ConcurrentDictionary<ScryptHash256, CBlock>();
- private ConcurrentDictionary<ScryptHash256, CBlock> orphanMapByPrev = new ConcurrentDictionary<ScryptHash256, CBlock>();
+ private ConcurrentDictionary<uint256, CBlock> orphanMap = new ConcurrentDictionary<uint256, CBlock>();
+ private ConcurrentDictionary<uint256, CBlock> orphanMapByPrev = new ConcurrentDictionary<uint256, CBlock>();
/// <summary>
- /// Map of unspent items.
+ /// Unconfirmed transactions.
+ ///
+ /// TxID => Transaction
/// </summary>
- private ConcurrentDictionary<Hash256, CTransactionStoreItem> txMap = new ConcurrentDictionary<Hash256, CTransactionStoreItem>();
+ private ConcurrentDictionary<uint256, CTransaction> mapUnconfirmedTx = new ConcurrentDictionary<uint256, CTransaction>();
+
+ /// <summary>
+ /// Map of the proof-of-stake hashes. This is necessary for stake duplication checks.
+ /// </summary>
+ private ConcurrentDictionary<uint256, uint256> mapProofOfStake = new ConcurrentDictionary<uint256, uint256>();
- 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;
+ private ConcurrentDictionary<COutPoint, uint> mapStakeSeen = new ConcurrentDictionary<COutPoint, uint>();
+ private ConcurrentDictionary<COutPoint, uint> mapStakeSeenOrphan = new ConcurrentDictionary<COutPoint, uint>();
/// <summary>
- /// Block file stream with read access
+ /// Trust score for the longest chain.
+ /// </summary>
+ private uint256 nBestChainTrust = 0;
+
+ /// <summary>
+ /// Top block of the best chain.
+ /// </summary>
+ private uint256 nHashBestChain = 0;
+
+ /// <summary>
+ /// Cursor which is pointing us to the end of best chain.
+ /// </summary>
+ private CBlockStoreItem bestBlockCursor = null;
+
+ /// <summary>
+ /// Cursor which is always pointing us to genesis block.
+ /// </summary>
+ private CBlockStoreItem genesisBlockCursor = null;
+
+ /// <summary>
+ /// Current and the only instance of block storage manager. Should be a property with private setter though it's enough for the beginning.
+ /// </summary>
+ public static CBlockStore Instance = null;
+
+ /// <summary>
+ /// Block file stream with read/write access
/// </summary>
private Stream fStreamReadWrite;
+ private uint nBestHeight;
+ private uint nTimeBestReceived;
+ private int nTransactionsUpdated;
/// <summary>
/// Init the block storage manager.
strBlockFile = BlockFile;
bool firstInit = !File.Exists(strDbFile);
- dbConn = new SQLiteConnection(new SQLitePlatformGeneric(), strDbFile);
+ dbPlatform = new SQLitePlatformGeneric();
+ dbConn = new SQLiteConnection(dbPlatform, strDbFile);
fStreamReadWrite = File.Open(strBlockFile, FileMode.OpenOrCreate, FileAccess.ReadWrite);
+ Instance = this;
+
if (firstInit)
{
lock (LockObj)
{
// Create tables
dbConn.CreateTable<CBlockStoreItem>(CreateFlags.AutoIncPK);
- dbConn.CreateTable<CTransactionStoreItem>(CreateFlags.ImplicitPK);
+ dbConn.CreateTable<CMerkleNode>(CreateFlags.AutoIncPK);
+ dbConn.CreateTable<TxOutItem>(CreateFlags.ImplicitPK);
+
+ var 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
+ ));
// Write block to file.
var itemTemplate = new CBlockStoreItem()
// Init list of block items
foreach (var item in blockTreeItems)
{
- blockMap.TryAdd(new ScryptHash256(item.Hash), item);
+ blockMap.TryAdd(item.Hash, item);
+
+ if (item.IsProofOfStake)
+ {
+ // build mapStakeSeen
+ mapStakeSeen.TryAdd(item.prevoutStake, item.nStakeTime);
+ }
}
}
-
- Instance = this;
}
- public bool GetTransaction(Hash256 TxID, ref CTransaction tx)
+ public bool GetTxOutCursor(COutPoint outpoint, ref TxOutItem txOutCursor)
{
- var reader = new BinaryReader(fStreamReadWrite).BaseStream;
- var QueryTx = dbConn.Query<CTransactionStoreItem>("select * from [TransactionStorage] where [TransactionHash] = ?", (byte[])TxID);
+ var queryResults = dbConn.Query<TxOutItem>("select o.* from [Outputs] o left join [MerkleNodes] m on (m.nMerkleNodeID = o.nMerkleNodeID) where m.[TransactionHash] = ?", (byte[])outpoint.hash);
- if (QueryTx.Count == 1)
+ if (queryResults.Count == 1)
{
- return QueryTx[0].ReadFromFile(ref reader, out tx);
+ txOutCursor = queryResults[0];
+
+ return true;
}
// Tx not found
return false;
}
+ interface InputsJoin : ITxOutItem
+ {
+ byte[] TransactionHash { get; set; }
+ }
+
+ public bool FetchInputs(ref CTransaction tx, ref Dictionary<COutPoint, CTxOut> queued, ref Dictionary<COutPoint, CTxOut> inputs, bool IsBlock, out bool Invalid)
+ {
+ Invalid = false;
+
+ if (tx.IsCoinBase)
+ {
+ // Coinbase transactions have no inputs to fetch.
+ return true;
+ }
+
+ StringBuilder queryBuilder = new StringBuilder();
+
+ queryBuilder.Append("select o.*, m.[TransactionHash] from [Outputs] o left join [MerkleNodes] m on (m.[nMerkleNodeID] = o.[nMerkleNodeID]) where ");
+
+ for (var i = 0; i < tx.vin.Length; i++)
+ {
+ queryBuilder.AppendFormat(" {0} (m.[TransactionHash] = x'{1}' and o.[OutputNumber] = x'{2}')",
+ (i > 0 ? "or" : string.Empty), Interop.ToHex(tx.vin[i].prevout.hash),
+ Interop.ToHex(VarInt.EncodeVarInt(tx.vin[i].prevout.n)
+ ));
+ }
+
+ var queryResults = dbConn.Query<InputsJoin>(queryBuilder.ToString());
+
+ foreach (var item in queryResults)
+ {
+ if (item.IsSpent)
+ {
+ return false; // Already spent
+ }
+
+ var inputsKey = new COutPoint(item.TransactionHash, item.nOut);
+
+ // Add output data to dictionary
+ inputs[inputsKey] = new CTxOut(item.nValue, item.scriptPubKey);
+ }
+
+ if (queryResults.Count < tx.vin.Length)
+ {
+ if (IsBlock)
+ {
+ // It seems that some transactions are being spent in the same block.
+
+ foreach (var txin in tx.vin)
+ {
+ var outPoint = txin.prevout;
+
+ if (!queued.ContainsKey(outPoint))
+ {
+ return false; // No such transaction
+ }
+
+ // Add output data to dictionary
+ inputs[outPoint] = queued[outPoint];
+
+ // And remove it from queued data
+ queued.Remove(outPoint);
+ }
+ }
+ else
+ {
+ // Unconfirmed transaction
+
+ foreach (var txin in tx.vin)
+ {
+ var outPoint = txin.prevout;
+ CTransaction txPrev;
+
+ if (!mapUnconfirmedTx.TryGetValue(outPoint.hash, out txPrev))
+ {
+ return false; // No such transaction
+ }
+
+ if (outPoint.n > txPrev.vout.Length)
+ {
+ Invalid = true;
+
+ return false; // nOut is out of range
+ }
+
+ inputs[outPoint] = txPrev.vout[outPoint.n];
+ }
+
+ return false;
+ }
+ }
+
+ return true;
+ }
+
private bool AddItemToIndex(ref CBlockStoreItem itemTemplate, ref CBlock block)
{
var writer = new BinaryWriter(fStreamReadWrite).BaseStream;
- var blockHash = new ScryptHash256(itemTemplate.Hash);
+ uint256 blockHash = itemTemplate.Hash;
if (blockMap.ContainsKey(blockHash))
{
return false;
}
- // TODO: compute chain trust, set stake entropy bit, record proof-of-stake hash value
+ // Compute chain trust score
+ itemTemplate.nChainTrust = (itemTemplate.prev != null ? itemTemplate.prev.nChainTrust : 0) + itemTemplate.nBlockTrust;
+
+ if (!itemTemplate.SetStakeEntropyBit(Entropy.GetStakeEntropyBit(itemTemplate.nHeight, blockHash)))
+ {
+ return false; // SetStakeEntropyBit() failed
+ }
+
+ // Save proof-of-stake hash value
+ if (itemTemplate.IsProofOfStake)
+ {
+ uint256 hashProofOfStake;
+ if (!GetProofOfStakeHash(blockHash, out hashProofOfStake))
+ {
+ return false; // hashProofOfStake not found
+ }
+ itemTemplate.hashProofOfStake = hashProofOfStake;
+ }
+
+ // compute stake modifier
+ long nStakeModifier = 0;
+ bool fGeneratedStakeModifier = false;
+ if (!StakeModifier.ComputeNextStakeModifier(itemTemplate, ref nStakeModifier, ref fGeneratedStakeModifier))
+ {
+ return false; // ComputeNextStakeModifier() failed
+ }
- // TODO: compute stake modifier
+ itemTemplate.SetStakeModifier(nStakeModifier, fGeneratedStakeModifier);
+ itemTemplate.nStakeModifierChecksum = StakeModifier.GetStakeModifierChecksum(itemTemplate);
+
+ // TODO: verify stake modifier checkpoints
// Add to index
- itemTemplate.BlockTypeFlag = block.IsProofOfStake ? BlockType.PROOF_OF_STAKE : BlockType.PROOF_OF_WORK;
+ if (block.IsProofOfStake)
+ {
+ itemTemplate.SetProofOfStake();
+
+ itemTemplate.prevoutStake = block.vtx[1].vin[0].prevout;
+ itemTemplate.nStakeTime = block.vtx[1].nTime;
+ }
if (!itemTemplate.WriteToFile(ref writer, ref block))
{
return false;
}
- dbConn.Insert(itemTemplate);
+ if (dbConn.Insert(itemTemplate) == 0)
+ {
+ return false; // Insert failed
+ }
+
+ // Get last RowID.
+ itemTemplate.ItemID = dbPlatform.SQLiteApi.LastInsertRowid(dbConn.Handle);
+
+ if (!blockMap.TryAdd(blockHash, itemTemplate))
+ {
+ return false; // blockMap add failed
+ }
- // We have no SetBestChain and ConnectBlock/Disconnect block yet, so adding these transactions manually.
- for (int i = 0; i < block.vtx.Length; i++)
+ if (itemTemplate.nChainTrust > nBestChainTrust)
{
- // Handle trasactions
+ // New best chain
+
+ if (!SetBestChain(ref itemTemplate))
+ {
+ return false; // SetBestChain failed.
+ }
+ }
+
+ return true;
+ }
- if (!block.vtx[i].VerifyScripts())
+ private bool SetBestChain(ref CBlockStoreItem cursor)
+ {
+ uint256 hashBlock = cursor.Hash;
+
+ if (genesisBlockCursor == null && hashBlock == NetUtils.nHashGenesisBlock)
+ {
+ genesisBlockCursor = cursor;
+ }
+ else if (nHashBestChain == (uint256)cursor.prevHash)
+ {
+ if (!SetBestChainInner(cursor))
{
return false;
}
+ }
+ else
+ {
+ // the first block in the new chain that will cause it to become the new best chain
+ var cursorIntermediate = cursor;
+
+ // list of blocks that need to be connected afterwards
+ var secondary = new List<CBlockStoreItem>();
+
+ // Reorganize is costly in terms of db load, as it works in a single db transaction.
+ // Try to limit how much needs to be done inside
+ while (cursorIntermediate.prev != null && cursorIntermediate.prev.nChainTrust > bestBlockCursor.nChainTrust)
+ {
+ secondary.Add(cursorIntermediate);
+ cursorIntermediate = cursorIntermediate.prev;
+ }
+
+ // Switch to new best branch
+ if (!Reorganize(cursorIntermediate))
+ {
+ InvalidChainFound(cursor);
+ return false; // reorganize failed
+ }
+
+ // Connect further blocks
+ foreach (var currentCursor in secondary)
+ {
+ CBlock block;
+ if (!currentCursor.ReadFromFile(ref fStreamReadWrite, out block))
+ {
+ // ReadFromDisk failed
+ break;
+ }
+
+ // errors now are not fatal, we still did a reorganisation to a new chain in a valid way
+ if (!SetBestChainInner(currentCursor))
+ {
+ break;
+ }
+ }
+ }
+
+ nHashBestChain = cursor.Hash;
+ bestBlockCursor = cursor;
+ nBestHeight = cursor.nHeight;
+ nBestChainTrust = cursor.nChainTrust;
+ nTimeBestReceived = Interop.GetTime();
+ nTransactionsUpdated++;
+
+ return true;
+ }
+
+ private void InvalidChainFound(CBlockStoreItem cursor)
+ {
+ throw new NotImplementedException();
+ }
+
+ private bool Reorganize(CBlockStoreItem cursorIntermediate)
+ {
+ // Find the fork
+ var fork = bestBlockCursor;
+ var longer = cursorIntermediate;
+
+ while (fork.ItemID != longer.ItemID)
+ {
+ while (longer.nHeight > fork.nHeight)
+ {
+ if ((longer = longer.prev) == null)
+ {
+ return false; // longer.prev is null
+ }
+ }
+
+ if (fork.ItemID == longer.ItemID)
+ {
+ break;
+ }
+
+ if ((fork = fork.prev) == null)
+ {
+ return false; // fork.prev is null
+ }
+ }
+
+ // List of what to disconnect
+ var disconnect = new List<CBlockStoreItem>();
+ for (var cursor = bestBlockCursor; cursor.ItemID != fork.ItemID; cursor = cursor.prev)
+ {
+ disconnect.Add(cursor);
+ }
+
+ // List of what to connect
+ var connect = new List<CBlockStoreItem>();
+ for (var cursor = cursorIntermediate; cursor.ItemID != fork.ItemID; cursor = cursor.prev)
+ {
+ connect.Add(cursor);
+ }
+ connect.Reverse();
+
+ // Disconnect shorter branch
+ var txResurrect = new List<CTransaction>();
+ foreach (var blockCursor in disconnect)
+ {
+ CBlock block;
+ if (!blockCursor.ReadFromFile(ref fStreamReadWrite, out block))
+ {
+ return false; // ReadFromFile for disconnect failed.
+ }
+ if (!DisconnectBlock(blockCursor, ref block))
+ {
+ return false; // DisconnectBlock failed.
+ }
+
+ // Queue memory transactions to resurrect
+ foreach (var tx in block.vtx)
+ {
+ if (!tx.IsCoinBase && !tx.IsCoinStake)
+ {
+ txResurrect.Add(tx);
+ }
+ }
+ }
- var nTxOffset = itemTemplate.nBlockPos + block.GetTxOffset(i);
- TxType txnType = TxType.TX_USER;
- if (block.vtx[i].IsCoinBase)
+ // Connect longer branch
+ var txDelete = new List<CTransaction>();
+ foreach (var cursor in connect)
+ {
+ CBlock block;
+ if (!cursor.ReadFromFile(ref fStreamReadWrite, out block))
{
- txnType = TxType.TX_COINBASE;
+ return false; // ReadFromDisk for connect failed
}
- else if (block.vtx[i].IsCoinStake)
+
+ if (!ConnectBlock(cursor, ref block))
{
- txnType = TxType.TX_COINSTAKE;
+ // Invalid block
+ return false; // ConnectBlock failed
}
- var NewTxItem = new CTransactionStoreItem()
+ // Queue memory transactions to delete
+ foreach (var tx in block.vtx)
{
- TransactionHash = block.vtx[i].Hash,
- BlockHash = blockHash,
- nTxPos = nTxOffset,
- nTxSize = block.vtx[i].Size,
- txType = txnType
- };
+ txDelete.Add(tx);
+ }
+ }
- dbConn.Insert(NewTxItem);
+ if (!WriteHashBestChain(cursorIntermediate.Hash))
+ {
+ return false; // WriteHashBestChain failed
}
- return blockMap.TryAdd(blockHash, itemTemplate);
+ // Make sure it's successfully written to disk
+ dbConn.Commit();
+
+ // Resurrect memory transactions that were in the disconnected branch
+ foreach (var tx in txResurrect)
+ {
+ mapUnconfirmedTx.TryAdd(tx.Hash, tx);
+ }
+
+ // Delete redundant memory transactions that are in the connected branch
+ foreach (var tx in txDelete)
+ {
+ CTransaction dummy;
+ mapUnconfirmedTx.TryRemove(tx.Hash, out dummy);
+ }
+
+ return true; // Done
+ }
+
+ private bool DisconnectBlock(CBlockStoreItem blockCursor, ref CBlock block)
+ {
+ throw new NotImplementedException();
+ }
+
+ private bool SetBestChainInner(CBlockStoreItem cursor)
+ {
+ uint256 hash = cursor.Hash;
+ CBlock block;
+ if (!cursor.ReadFromFile(ref fStreamReadWrite, out block))
+ {
+ return false; // Unable to read block from file.
+ }
+
+ // Adding to current best branch
+ if (!ConnectBlock(cursor, ref block) || !WriteHashBestChain(hash))
+ {
+ InvalidChainFound(cursor);
+ return false;
+ }
+
+ // Add to current best branch
+ cursor.prev.next = cursor;
+
+ dbConn.Commit();
+
+ // Delete redundant memory transactions
+ foreach (var tx in block.vtx)
+ {
+ CTransaction dummy;
+ mapUnconfirmedTx.TryRemove(tx.Hash, out dummy);
+ }
+
+ return true;
+ }
+
+ private bool ConnectBlock(CBlockStoreItem cursor, ref CBlock block, bool fJustCheck=false)
+ {
+ // Check it again in case a previous version let a bad block in, but skip BlockSig checking
+ if (!block.CheckBlock(!fJustCheck, !fJustCheck, false))
+ {
+ return false; // Invalid block found.
+ }
+
+ // TODO: the remaining stuff lol :D
+
+ throw new NotImplementedException();
+ }
+
+ private bool WriteHashBestChain(uint256 hash)
+ {
+ throw new NotImplementedException();
+ }
+
+ /// <summary>
+ /// Try to find proof-of-stake hash in the map.
+ /// </summary>
+ /// <param name="blockHash">Block hash</param>
+ /// <param name="hashProofOfStake">Proof-of-stake hash</param>
+ /// <returns>Proof-of-Stake hash value</returns>
+ private bool GetProofOfStakeHash(uint256 blockHash, out uint256 hashProofOfStake)
+ {
+ return mapProofOfStake.TryGetValue(blockHash, out hashProofOfStake);
}
public bool AcceptBlock(ref CBlock block)
{
- ScryptHash256 hash = block.header.Hash;
+ uint256 nHash = block.header.Hash;
- if (blockMap.ContainsKey(hash))
+ if (blockMap.ContainsKey(nHash))
{
// Already have this block.
return false;
// Write block to file.
var itemTemplate = new CBlockStoreItem()
{
- nHeight = nHeight
+ nHeight = nHeight,
};
itemTemplate.FillHeader(block.header);
return true;
}
- public bool GetBlock(ScryptHash256 blockHash, ref CBlock block)
+ public bool GetBlock(uint256 blockHash, ref CBlock block, ref long nBlockPos)
{
var reader = new BinaryReader(fStreamReadWrite).BaseStream;
if (QueryBlock.Count == 1)
{
+ nBlockPos = QueryBlock[0].nBlockPos;
return QueryBlock[0].ReadFromFile(ref reader, out block);
}
return false;
}
+
+ /// <summary>
+ /// Interface for join
+ /// </summary>
+ interface IBlockJoinMerkle : IBlockStorageItem, IMerkleNode
+ {
+ }
+
+ /// <summary>
+ /// Get block and transaction by transaction hash.
+ /// </summary>
+ /// <param name="TxID">Transaction hash</param>
+ /// <param name="block">Block reference</param>
+ /// <param name="tx">Transaction reference</param>
+ /// <param name="nBlockPos">Block position reference</param>
+ /// <param name="nTxPos">Transaction position reference</param>
+ /// <returns>Result of operation</returns>
+ public bool GetBlockByTransactionID(uint256 TxID, ref CBlock block, ref CTransaction tx, ref long nBlockPos, ref long nTxPos)
+ {
+ var queryResult = dbConn.Query<IBlockJoinMerkle>("select *, from [BlockStorage] b left join [MerkleNodes] m on (b.[ItemID] = m.[nParentBlockID]) where m.[TransactionHash] = ?", (byte[])TxID);
+
+ if (queryResult.Count == 1)
+ {
+ CBlockStoreItem blockCursor = (CBlockStoreItem) queryResult[0];
+ CMerkleNode txCursor = (CMerkleNode)queryResult[0];
+
+ var reader = new BinaryReader(fStreamReadWrite).BaseStream;
+
+ if (!txCursor.ReadFromFile(ref reader, blockCursor.nBlockPos, out tx))
+ {
+ return false; // Unable to read transaction
+ }
+
+ return blockCursor.ReadFromFile(ref reader, out block);
+ }
+
+ // Tx not found
+
+ return false;
+ }
+
+ /// <summary>
+ /// Get block cursor from map.
+ /// </summary>
+ /// <param name="blockHash">block hash</param>
+ /// <returns>Cursor or null</returns>
+ public CBlockStoreItem GetCursor(uint256 blockHash)
+ {
+ if (blockHash == 0)
+ {
+ // Genesis block has zero prevHash and no parent.
+ return null;
+ }
+
+ // First, check our block map.
+ CBlockStoreItem item = null;
+ if (blockMap.TryGetValue(blockHash, out item))
+ {
+ return item;
+ }
+
+ // Trying to get cursor from the database.
+ var QueryBlockCursor = dbConn.Query<CBlockStoreItem>("select * from [BlockStorage] where [Hash] = ?", (byte[])blockHash);
+
+ if (QueryBlockCursor.Count == 1)
+ {
+ blockMap.TryAdd(blockHash, QueryBlockCursor[0]);
+
+ return QueryBlockCursor[0];
+ }
+
+ // Nothing found.
+ return null;
+ }
+
+ /// <summary>
+ /// Update cursor in memory and on disk.
+ /// </summary>
+ /// <param name="originalItem">Original cursor</param>
+ /// <param name="newItem">New cursor</param>
+ /// <returns></returns>
+ public bool UpdateCursor(CBlockStoreItem originalItem, ref CBlockStoreItem newItem)
+ {
+ if (blockMap.TryUpdate(originalItem.Hash, newItem, originalItem))
+ {
+ return dbConn.Update(newItem) != 0;
+ }
+
+ return false;
+ }
+
public bool ProcessBlock(ref CBlock block)
{
- ScryptHash256 blockHash = block.header.Hash;
+ var blockHash = block.header.Hash;
if (blockMap.ContainsKey(blockHash))
{
// TODO: Limited duplicity on stake and reserialization of block signature
- // Preliminary checks
if (!block.CheckBlock(true, true, true))
{
- return true;
+ // Preliminary checks failure.
+ return false;
}
if (block.IsProofOfStake)
{
+ if (!block.SignatureOK)
+ {
+ // Proof-of-Stake signature validation failure.
+ return false;
+ }
+
// TODO: proof-of-stake validation
+
+ uint256 hashProofOfStake = 0, targetProofOfStake = 0;
+ if (!StakeModifier.CheckProofOfStake(block.vtx[1], block.header.nBits, ref hashProofOfStake, ref targetProofOfStake))
+ {
+ return false; // do not error here as we expect this during initial block download
+ }
+ if (!mapProofOfStake.ContainsKey(blockHash))
+ {
+ // add to mapProofOfStake
+ mapProofOfStake.TryAdd(blockHash, hashProofOfStake);
+ }
+
}
// TODO: difficulty verification
}
// Recursively process any orphan blocks that depended on this one
- var orphansQueue = new List<ScryptHash256>();
+ var orphansQueue = new List<uint256>();
orphansQueue.Add(blockHash);
for (int i = 0; i < orphansQueue.Count; i++)
{
- ScryptHash256 hashPrev = orphansQueue[i];
+ var hashPrev = orphansQueue[i];
foreach (var pair in orphanMap)
{
readerForBlocks.Seek(nOffset, SeekOrigin.Begin); // Seek to previous offset + previous block length
- dbConn.BeginTransaction();
-
while (readerForBlocks.Read(buffer, 0, 4) == 4) // Read magic number
{
var nMagic = BitConverter.ToUInt32(buffer, 0);
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();