-\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;
/// Block headers table
/// </summary>
[Table("BlockStorage")]
- class CBlockStoreItem
+ public class CBlockStoreItem
{
/// <summary>
/// Item ID in the database
public uint nNonce { get; set; }
/// <summary>
+ /// Next block hash.
+ /// </summary>
+ public byte[] nextHash { get; set; }
+
+ /// <summary>
/// Block type flags
/// </summary>
public BlockType BlockTypeFlag { get; set; }
public long nStakeModifier { get; set; }
/// <summary>
- /// Stake entropy bit
+ /// Stake modifier checksum.
+ /// </summary>
+ public uint nStakeModifierChecksum { get; set; }
+
+ /// <summary>
+ /// Chain trust score
/// </summary>
- public byte nEntropyBit { get; set; }
+ public byte[] ChainTrust { get; set; }
+
+ /// <summary>
+ /// Proof-of-Stake hash
+ /// </summary>
+ public byte[] hashProofOfStake { get; set; }
/// <summary>
/// Block height
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 { return CBlockStore.Instance.GetCursor(nextHash); }
+ }
+
+ [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>
+ /// Chain trust score.
+ /// </summary>
+ [Ignore]
+ public uint256 nChainTrust {
+ get
+ {
+ if (ChainTrust.Length != 32)
+ {
+ byte[] tmp = ChainTrust;
+ Array.Resize(ref tmp, 32);
+ ChainTrust = tmp;
+ }
+
+ return ChainTrust;
+ }
+ set { ChainTrust = Interop.TrimArray(value); }
+ }
+
+ /// <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>
/// </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>
/// </summary>
private ConcurrentDictionary<uint256, CTransactionStoreItem> txMap = new ConcurrentDictionary<uint256, CTransactionStoreItem>();
+ private ConcurrentDictionary<uint256, uint256> mapProofOfStake = new ConcurrentDictionary<uint256, uint256>();
+
public static CBlockStore Instance;
/// <summary>
fStreamReadWrite = File.Open(strBlockFile, FileMode.OpenOrCreate, FileAccess.ReadWrite);
+ Instance = this;
+
if (firstInit)
{
lock (LockObj)
blockMap.TryAdd(item.Hash, item);
}
}
-
- Instance = this;
}
public bool GetTransaction(uint256 TxID, ref CTransaction tx)
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 (!CBlockStore.Instance.GetProofOfStakeHash(blockHash, out hashProofOfStake))
+ {
+ return false; // hashProofOfStake not found
+ }
+ itemTemplate.hashProofOfStake = hashProofOfStake;
+ }
// TODO: compute stake modifier
+ // ppcoin: compute stake modifier
+ long nStakeModifier = 0;
+ bool fGeneratedStakeModifier = false;
+ if (!StakeModifier.ComputeNextStakeModifier(itemTemplate, ref nStakeModifier, ref fGeneratedStakeModifier))
+ {
+ return false; // ComputeNextStakeModifier() failed
+ }
+
+ 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();
+ }
if (!itemTemplate.WriteToFile(ref writer, ref block))
{
return blockMap.TryAdd(blockHash, itemTemplate);
}
+ /// <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)
{
uint256 nHash = block.header.Hash;
var itemTemplate = new CBlockStoreItem()
{
nHeight = nHeight,
- nEntropyBit = Entropy.GetStakeEntropyBit(nHeight, nHash)
};
itemTemplate.FillHeader(block.header);
return true;
}
- public bool GetBlock(uint256 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;
}
+ public bool GetByTransactionID(uint256 TxID, ref CBlock block, ref CTransaction tx, ref long nBlockPos, ref long nTxPos)
+ {
+ var QueryTx = dbConn.Query<CTransactionStoreItem>("select * from [TransactionStorage] where [TransactionHash] = ?", (byte[])TxID);
+
+ if (QueryTx.Count == 1)
+ {
+ nTxPos = QueryTx[0].nTxPos;
+ return GetBlock(QueryTx[0].BlockHash, ref block, ref nBlockPos);
+ }
+
+ // 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)
+ {
+ return QueryBlockCursor[0];
+ }
+
+ // Nothing found.
+ return null;
+ }
+
public bool ProcessBlock(ref CBlock block)
{
var blockHash = block.header.Hash;
}
// 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
git://git.novaco.in / NovacoinLibrary.git / blobdiff