using 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;
+using System.Text;
using System.Diagnostics.Contracts;
+using System.Linq;
namespace Novacoin
{
- /// <summary>
- /// Block headers table
- /// </summary>
- [Table("BlockStorage")]
- public class CBlockStoreItem
- {
- /// <summary>
- /// Item ID in the database
- /// </summary>
- [PrimaryKey, AutoIncrement]
- public long ItemID { get; set; }
-
- /// <summary>
- /// PBKDF2+Salsa20 of block hash
- /// </summary>
- [Unique]
- public byte[] Hash { get; set; }
-
- /// <summary>
- /// Version of block schema
- /// </summary>
- 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>
- /// Next block hash.
- /// </summary>
- public byte[] nextHash { get; set; }
-
- /// <summary>
- /// Block type flags
- /// </summary>
- public BlockType BlockTypeFlag { get; set; }
-
- /// <summary>
- /// Stake modifier
- /// </summary>
- public long nStakeModifier { get; set; }
-
- /// <summary>
- /// Proof-of-Stake hash
- /// </summary>
- public byte[] hashProofOfStake { get; set; }
-
- /// <summary>
- /// Stake generation outpoint.
- /// </summary>
- public byte[] prevoutStake { get; set; }
-
- /// <summary>
- /// Stake generation time.
- /// </summary>
- public uint nStakeTime { get; set; }
-
- /// <summary>
- /// Block height
- /// </summary>
- public uint nHeight { get; set; }
-
- /// <summary>
- /// Block position in file
- /// </summary>
- public long nBlockPos { get; set; }
-
- /// <summary>
- /// 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 uint256 FillHeader(CBlockHeader header)
- {
- uint256 _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 = prevHash;
- header.merkleRoot = 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);
- writer.Write(blkLenBytes, 0, blkLenBytes.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(blockBytes, 0, blockBytes.Length);
- writer.Flush();
-
- return true;
- }
- catch (IOException)
- {
- // I/O error
- return false;
- }
- catch (Exception)
- {
- // Some serialization error
- 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); }
- 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>
- public uint256 nChainTrust;
- }
-
- /// <summary>
- /// Block type.
- /// </summary>
- public enum BlockType
- {
- 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
- {
- TX_COINBASE,
- TX_COINSTAKE,
- TX_USER
- }
-
- /// <summary>
- /// Transaction type.
- /// </summary>
- public enum OutputType
- {
- TX_USER = (1 << 0), // User output
- TX_COINBASE = (1 << 1), // Coinbase output
- TX_COINSTAKE = (1 << 2), // Coinstake output
- TX_AVAILABLE = (2 << 0), // Unspent output
- TX_SPENT = (2 << 1) // Spent output
- }
-
- [Table("MerkleNodes")]
- public class MerkleNode
- {
- [PrimaryKey, AutoIncrement]
- public long nMerkleNodeID { get; set; }
-
- /// <summary>
- /// Reference to parent block database item.
- /// </summary>
- [ForeignKey(typeof(CBlockStoreItem), Name = "ItemId")]
- public long nParentBlockID { get; set; }
-
- /// <summary>
- /// Transaction hash
- /// </summary>
- public byte[] TransactionHash { get; set; }
-
- public static bool QueryParentBlockCursor(uint256 transactionHash, out CBlockStoreItem cursor)
- {
- throw new NotImplementedException();
- }
- }
-
- [Table("Outputs")]
- public class TxOutItem
- {
- /// <summary>
- /// Link the transaction hash with database item identifier.
- /// </summary>
- private static ConcurrentDictionary<uint256, long> outMap = new ConcurrentDictionary<uint256, long>();
-
- /// <summary>
- /// Reference to transaction item.
- /// </summary>
- [ForeignKey(typeof(MerkleNode), Name = "nMerkleNodeID")]
- public long nMerkleNodeID { get; set; }
-
- /// <summary>
- /// Output flags
- /// </summary>
- public OutputType 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>
- /// Construct new item from provided transaction data.
- /// </summary>
- /// <param name="o"></param>
- public TxOutItem(CTransaction tx, uint nOut)
- {
- Contract.Requires<ArgumentException>(nOut < tx.vout.Length);
-
- long nMerkleId = 0;
- if (!outMap.TryGetValue(tx.Hash, out nMerkleId))
- {
- // Not in the blockchain
- nMerkleNodeID = -1;
- }
-
- OutputNumber = VarInt.EncodeVarInt(nOut);
- OutputValue = VarInt.EncodeVarInt(tx.vout[nOut].nValue);
- scriptPubKey = tx.vout[nOut].scriptPubKey;
-
- if (tx.IsCoinBase)
- {
- outputFlags |= OutputType.TX_COINBASE;
- }
- else if (tx.IsCoinStake)
- {
- outputFlags |= OutputType.TX_COINSTAKE;
- }
- }
-
- /// <summary>
- /// Getter for output number.
- /// </summary>
- [Ignore]
- public uint nOut
- {
- get { return (uint)VarInt.DecodeVarInt(OutputNumber); }
- }
-
- /// <summary>
- /// Getter for output value.
- /// </summary>
- [Ignore]
- public ulong nValue
- {
- get { return VarInt.DecodeVarInt(OutputValue); }
- }
-
- /// <summary>
- /// Is this a user transaction output?
- /// </summary>
- [Ignore]
- public bool IsUser
- {
- get { return (outputFlags & OutputType.TX_USER) != 0; }
- }
-
- /// <summary>
- /// Is this a coinbase transaction output?
- /// </summary>
- [Ignore]
- public bool IsCoinBase
- {
- get { return (outputFlags & OutputType.TX_COINBASE) != 0; }
- }
-
- /// <summary>
- /// Is this a coinstake transaction output?
- /// </summary>
- [Ignore]
- public bool IsCoinStake
- {
- get { return (outputFlags & OutputType.TX_COINSTAKE) != 0; }
- }
-
- /// <summary>
- /// Getter ans setter for IsSpent flag.
- /// </summary>
- [Ignore]
- public bool IsSpent
- {
- get { return (outputFlags & OutputType.TX_SPENT) != 0; }
- set { outputFlags |= value ? OutputType.TX_SPENT : OutputType.TX_AVAILABLE; }
- }
- }
-
-
- [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>
- /// Serialized output array
- /// </summary>
- public byte[] vOut { 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[CTransaction.nMaxTxSize];
- 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;
- }
- }
-
- /// <summary>
- /// Outputs array access
- /// </summary>
- [Ignore]
- public CTxOut[] Outputs {
- get { return CTxOut.DeserializeOutputsArray(vOut); }
- set { vOut = CTxOut.SerializeOutputsArray(value); }
- }
- }
-
public class CBlockStore : IDisposable
{
public const uint nMagicNumber = 0xe5e9e8e4;
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<uint256, CBlockStoreItem> blockMap = new ConcurrentDictionary<uint256, CBlockStoreItem>();
private ConcurrentDictionary<uint256, CBlock> orphanMapByPrev = new ConcurrentDictionary<uint256, CBlock>();
/// <summary>
- /// Map of unspent items.
+ /// Unconfirmed transactions.
+ ///
+ /// TxID => Transaction
/// </summary>
- private ConcurrentDictionary<uint256, CTransactionStoreItem> txMap = new ConcurrentDictionary<uint256, 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<COutPoint, uint> mapStakeSeen = new ConcurrentDictionary<COutPoint, uint>();
private ConcurrentDictionary<COutPoint, uint> mapStakeSeenOrphan = new ConcurrentDictionary<COutPoint, uint>();
- /// <summary>
- /// Unconfirmed transactions.
- /// </summary>
- private ConcurrentDictionary<uint256, CTransaction> mapUnconfirmedTx = new ConcurrentDictionary<uint256, CTransaction>();
/// <summary>
- /// Trust score for the longest chain.
+ /// Copy of chain state object.
/// </summary>
- private uint256 nBestChainTrust = 0;
-
- /// <summary>
- /// Top block of the best chain.
- /// </summary>
- private uint256 nHashBestChain = 0;
+ private ChainState ChainParams;
/// <summary>
/// Cursor which is pointing us to the end of best chain.
/// Block file stream with read/write access
/// </summary>
private Stream fStreamReadWrite;
+ 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);
{
// Create tables
dbConn.CreateTable<CBlockStoreItem>(CreateFlags.AutoIncPK);
- dbConn.CreateTable<CTransactionStoreItem>(CreateFlags.ImplicitPK);
+ dbConn.CreateTable<CMerkleNode>(CreateFlags.AutoIncPK);
+ dbConn.CreateTable<TxOutItem>(CreateFlags.ImplicitPK);
+ dbConn.CreateTable<ChainState>(CreateFlags.AutoIncPK);
+
+ ChainParams = new ChainState()
+ {
+ nBestChainTrust = 0,
+ nBestHeight = 0,
+ nHashBestChain = 0
+ };
+
+ dbConn.Insert(ChainParams);
var genesisBlock = new CBlock(
Interop.HexToArray(
mapStakeSeen.TryAdd(item.prevoutStake, item.nStakeTime);
}
}
+
+ // Load data about the top node.
+ ChainParams = dbConn.Table<ChainState>().First();
}
}
- public bool GetTransaction(uint256 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;
}
+
+ public bool FetchInputs(CTransaction tx, ref Dictionary<COutPoint, TxOutItem> queued, ref Dictionary<COutPoint, TxOutItem> 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);
+
+ item.IsSpent = true;
+
+ // Add output data to dictionary
+ inputs.Add(inputsKey, (TxOutItem)item);
+ }
+
+ 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.Add(outPoint, queued[outPoint]);
+
+ // Mark output as spent
+ queued[outPoint].IsSpent = true;
+ }
+ }
+ 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
+ }
+
+ // TODO: return inputs from map
+ throw new NotImplementedException();
+
+ }
+
+ return false;
+ }
+ }
+
+ return true;
+ }
private bool AddItemToIndex(ref CBlockStoreItem itemTemplate, ref CBlock block)
{
- var writer = new BinaryWriter(fStreamReadWrite).BaseStream;
uint256 blockHash = itemTemplate.Hash;
if (blockMap.ContainsKey(blockHash))
return false;
}
+ // Begin transaction
+ dbConn.BeginTransaction();
+
// Compute chain trust score
itemTemplate.nChainTrust = (itemTemplate.prev != null ? itemTemplate.prev.nChainTrust : 0) + itemTemplate.nBlockTrust;
itemTemplate.nStakeTime = block.vtx[1].nTime;
}
- if (!itemTemplate.WriteToFile(ref writer, ref block))
+ if (!itemTemplate.WriteToFile(ref fStreamReadWrite, ref block))
{
return false;
}
- if (dbConn.Insert(itemTemplate) == 0 || !blockMap.TryAdd(blockHash, itemTemplate))
+ if (dbConn.Insert(itemTemplate) == 0)
{
- return false;
+ return false; // Insert failed
}
- if (itemTemplate.nChainTrust > nBestChainTrust)
+ // Get last RowID.
+ itemTemplate.ItemID = dbPlatform.SQLiteApi.LastInsertRowid(dbConn.Handle);
+
+ if (!blockMap.TryAdd(blockHash, itemTemplate))
{
- // New best chain
+ return false; // blockMap add failed
+ }
- // TODO: SetBestChain implementation
+ if (itemTemplate.nChainTrust > ChainParams.nBestChainTrust)
+ {
+ // New best chain
- /*
if (!SetBestChain(ref itemTemplate))
{
return false; // SetBestChain failed.
}
- */
}
- // 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 using our temporary stub algo
-
- 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);
- }
+ // Commit transaction
+ dbConn.Commit();
return true;
}
private bool SetBestChain(ref CBlockStoreItem cursor)
{
- dbConn.BeginTransaction();
-
uint256 hashBlock = cursor.Hash;
- if (genesisBlockCursor == null && hashBlock == NetUtils.nHashGenesisBlock)
+ if (genesisBlockCursor == null && hashBlock == NetInfo.nHashGenesisBlock)
{
genesisBlockCursor = cursor;
}
- else if (nHashBestChain == (uint256)cursor.prevHash)
+ else if (ChainParams.nHashBestChain == (uint256)cursor.prevHash)
{
if (!SetBestChainInner(cursor))
{
else
{
// the first block in the new chain that will cause it to become the new best chain
- CBlockStoreItem cursorIntermediate = cursor;
+ var cursorIntermediate = cursor;
// list of blocks that need to be connected afterwards
- List<CBlockStoreItem> secondary = new List<CBlockStoreItem>();
+ 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
// Switch to new best branch
if (!Reorganize(cursorIntermediate))
{
- dbConn.Rollback();
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;
+ }
+ }
}
+ bestBlockCursor = cursor;
+ nTimeBestReceived = Interop.GetTime();
+ nTransactionsUpdated++;
- throw new NotImplementedException();
+ return true;
}
private void InvalidChainFound(CBlockStoreItem cursor)
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);
+ }
+ }
+ }
+
+
+ // Connect longer branch
+ var txDelete = new List<CTransaction>();
+ foreach (var cursor in connect)
+ {
+ CBlock block;
+ if (!cursor.ReadFromFile(ref fStreamReadWrite, out block))
+ {
+ return false; // ReadFromDisk for connect failed
+ }
+
+ if (!ConnectBlock(cursor, ref block))
+ {
+ // Invalid block
+ return false; // ConnectBlock failed
+ }
+
+ // Queue memory transactions to delete
+ foreach (var tx in block.vtx)
+ {
+ txDelete.Add(tx);
+ }
+ }
+
+ if (!UpdateTopChain(cursorIntermediate))
+ {
+ return false; // UpdateTopChain failed
+ }
+
+ // 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();
}
{
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, false, out block) || !WriteHashBestChain(hash))
+ if (!ConnectBlock(cursor, ref block) || !UpdateTopChain(cursor))
{
- dbConn.Rollback();
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)
{
return true;
}
- private bool ConnectBlock(CBlockStoreItem cursor, bool fJustCheck, out CBlock block)
+ private bool ConnectBlock(CBlockStoreItem cursor, ref CBlock block, bool fJustCheck = false)
{
- var reader = new BinaryReader(fStreamReadWrite).BaseStream;
- if (cursor.ReadFromFile(ref reader, out block))
- {
- return false; // Unable to read block from file.
- }
-
// 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
+ bool fScriptChecks = cursor.nHeight >= Checkpoints.TotalBlocksEstimate;
+ var scriptFlags = scriptflag.SCRIPT_VERIFY_NOCACHE | scriptflag.SCRIPT_VERIFY_P2SH;
- throw new NotImplementedException();
+ ulong nFees = 0;
+ ulong nValueIn = 0;
+ ulong nValueOut = 0;
+ uint nSigOps = 0;
+
+ var queuedMerkleNodes = new Dictionary<uint256, CMerkleNode>();
+ var queued = new Dictionary<COutPoint, TxOutItem>();
+
+ for (var nTx = 0; nTx < block.vtx.Length; nTx++)
+ {
+ var tx = block.vtx[nTx];
+ var hashTx = tx.Hash;
+ var nTxPos = cursor.nBlockPos + block.GetTxOffset(nTx);
+
+ Dictionary<COutPoint, TxOutItem> txouts;
+ if (GetOutputs(hashTx, out txouts))
+ {
+ // Do not allow blocks that contain transactions which 'overwrite' older transactions,
+ // unless those are already completely spent.
+ return false;
+ }
+
+ nSigOps += tx.LegacySigOpCount;
+ if (nSigOps > CBlock.nMaxSigOps)
+ {
+ return false; // too many sigops
+ }
+
+ var inputs = new Dictionary<COutPoint, TxOutItem>();
+
+ if (tx.IsCoinBase)
+ {
+ nValueOut += tx.nValueOut;
+ }
+ else
+ {
+ bool Invalid;
+ if (!FetchInputs(tx, ref queued, ref inputs, true, out Invalid))
+ {
+ return false; // Unable to fetch some inputs.
+ }
+
+ // Add in sigops done by pay-to-script-hash inputs;
+ // this is to prevent a "rogue miner" from creating
+ // an incredibly-expensive-to-validate block.
+ nSigOps += tx.GetP2SHSigOpCount(ref inputs);
+ if (nSigOps > CBlock.nMaxSigOps)
+ {
+ return false; // too many sigops
+ }
+
+ ulong nTxValueIn = tx.GetValueIn(ref inputs);
+ ulong nTxValueOut = tx.nValueOut;
+
+ nValueIn += nTxValueIn;
+ nValueOut += nTxValueOut;
+
+ if (!tx.IsCoinStake)
+ {
+ nFees += nTxValueIn - nTxValueOut;
+ }
+
+ if (!ConnectInputs(tx, ref inputs, ref queued, ref cursor, true, fScriptChecks, scriptFlags))
+ {
+ return false;
+ }
+ }
+
+ for (var i = 0u; i < tx.vout.Length; i++)
+ {
+ var mNode = new CMerkleNode(cursor.ItemID, nTxPos, tx);
+ queuedMerkleNodes.Add(hashTx, mNode);
+
+ var outKey = new COutPoint(hashTx, i);
+ var outData = new TxOutItem();
+
+ outData.nValue = tx.vout[i].nValue;
+ outData.scriptPubKey = tx.vout[i].scriptPubKey;
+ outData.nOut = i;
+
+
+ outData.IsSpent = false;
+
+ queued.Add(outKey, outData);
+ }
+ }
+
+ if (!block.IsProofOfStake)
+ {
+ ulong nBlockReward = CBlock.GetProofOfWorkReward(cursor.nBits, nFees);
+
+ // Check coinbase reward
+ if (block.vtx[0].nValueOut > nBlockReward)
+ {
+ return false; // coinbase reward exceeded
+ }
+ }
+
+ cursor.nMint = (long)(nValueOut - nValueIn + nFees);
+ cursor.nMoneySupply = (cursor.prev != null ? cursor.prev.nMoneySupply : 0) + (long)nValueOut - (long)nValueIn;
+
+ if (!UpdateDBCursor(ref cursor))
+ {
+ return false; // Unable to commit changes
+ }
+
+ if (fJustCheck)
+ {
+ return true;
+ }
+
+ // Write queued transaction changes
+ var actualMerkleNodes = new Dictionary<uint256, CMerkleNode>();
+ var queuedOutpointItems = new List<TxOutItem>();
+ foreach (KeyValuePair<COutPoint, TxOutItem> outPair in queued)
+ {
+ uint256 txID = outPair.Key.hash;
+ CMerkleNode merkleNode;
+
+ if (actualMerkleNodes.ContainsKey(txID))
+ {
+ merkleNode = actualMerkleNodes[txID];
+ }
+ else
+ {
+ merkleNode = queuedMerkleNodes[txID];
+ if (!SaveMerkleNode(ref merkleNode))
+ {
+ // Unable to save merkle tree cursor.
+ return false;
+ }
+ actualMerkleNodes.Add(txID, merkleNode);
+ }
+
+ var outItem = outPair.Value;
+ outItem.nMerkleNodeID = merkleNode.nMerkleNodeID;
+
+ queuedOutpointItems.Add(outItem);
+ }
+
+ if (!SaveOutpoints(ref queuedOutpointItems))
+ {
+ return false; // Unable to save outpoints
+ }
+
+ return true;
}
- private bool WriteHashBestChain(uint256 hash)
+ /// <summary>
+ /// Insert set of outpoints
+ /// </summary>
+ /// <param name="queuedOutpointItems">List of TxOutItem objects.</param>
+ /// <returns>Result</returns>
+ private bool SaveOutpoints(ref List<TxOutItem> queuedOutpointItems)
{
- throw new NotImplementedException();
+ return dbConn.InsertAll(queuedOutpointItems, false) != 0;
+ }
+
+ /// <summary>
+ /// Insert merkle node into db and set actual record id value.
+ /// </summary>
+ /// <param name="merkleNode">Merkle node object reference.</param>
+ /// <returns>Result</returns>
+ private bool SaveMerkleNode(ref CMerkleNode merkleNode)
+ {
+ if (dbConn.Insert(merkleNode) == 0)
+ {
+ return false;
+ }
+
+ merkleNode.nMerkleNodeID = dbPlatform.SQLiteApi.LastInsertRowid(dbConn.Handle);
+
+ return true;
+ }
+
+ private bool ConnectInputs(CTransaction tx, ref Dictionary<COutPoint, TxOutItem> inputs, ref Dictionary<COutPoint, TxOutItem> queued, ref CBlockStoreItem cursorBlock, bool fBlock, bool fScriptChecks, scriptflag scriptFlags)
+ {
+ // Take over previous transactions' spent pointers
+ // fBlock is true when this is called from AcceptBlock when a new best-block is added to the blockchain
+ // fMiner is true when called from the internal bitcoin miner
+ // ... both are false when called from CTransaction::AcceptToMemoryPool
+
+ if (!tx.IsCoinBase)
+ {
+ ulong nValueIn = 0;
+ ulong nFees = 0;
+ for (uint i = 0; i < tx.vin.Length; i++)
+ {
+ var prevout = tx.vin[i].prevout;
+ Contract.Assert(inputs.ContainsKey(prevout));
+ var input = inputs[prevout];
+
+ CBlockStoreItem parentBlockCursor;
+ var merkleItem = GetMerkleCursor(input, out parentBlockCursor);
+
+ if (merkleItem == null)
+ {
+ return false; // Unable to find merkle node
+ }
+
+ // If prev is coinbase or coinstake, check that it's matured
+ if (merkleItem.IsCoinBase || merkleItem.IsCoinStake)
+ {
+ if (cursorBlock.nHeight - parentBlockCursor.nHeight < NetInfo.nGeneratedMaturity)
+ {
+ return false; // tried to spend non-matured generation input.
+ }
+ }
+
+ // check transaction timestamp
+ if (merkleItem.nTime > tx.nTime)
+ {
+ return false; // transaction timestamp earlier than input transaction
+ }
+
+ // Check for negative or overflow input values
+ nValueIn += input.nValue;
+ if (!CTransaction.MoneyRange(input.nValue) || !CTransaction.MoneyRange(nValueIn))
+ {
+ return false; // txin values out of range
+ }
+
+ }
+
+ // The first loop above does all the inexpensive checks.
+ // Only if ALL inputs pass do we perform expensive ECDSA signature checks.
+ // Helps prevent CPU exhaustion attacks.
+ for (int i = 0; i < tx.vin.Length; i++)
+ {
+ var prevout = tx.vin[i].prevout;
+ Contract.Assert(inputs.ContainsKey(prevout));
+ var input = inputs[prevout];
+
+ // Check for conflicts (double-spend)
+ if (input.IsSpent)
+ {
+ return false;
+ }
+
+ // Skip ECDSA signature verification when connecting blocks (fBlock=true)
+ // before the last blockchain checkpoint. This is safe because block merkle hashes are
+ // still computed and checked, and any change will be caught at the next checkpoint.
+ if (fScriptChecks)
+ {
+ // Verify signature
+ if (!ScriptCode.VerifyScript(tx.vin[i].scriptSig, input.scriptPubKey, tx, i, (int)scriptflag.SCRIPT_VERIFY_P2SH, 0))
+ {
+ return false; // VerifyScript failed.
+ }
+ }
+
+ // Mark outpoint as spent
+ input.IsSpent = true;
+ inputs[prevout] = input;
+
+ // Write back
+ if (fBlock)
+ {
+ queued.Add(prevout, input);
+ }
+ }
+
+ if (tx.IsCoinStake)
+ {
+ // ppcoin: coin stake tx earns reward instead of paying fee
+ ulong nCoinAge;
+ if (!tx.GetCoinAge(ref inputs, out nCoinAge))
+ {
+ return false; // unable to get coin age for coinstake
+ }
+
+ int nTxSize = (tx.nTime > NetInfo.nStakeValidationSwitchTime) ? tx.Size : 0;
+ ulong nReward = tx.nValueOut - nValueIn;
+
+ ulong nCalculatedReward = CBlock.GetProofOfStakeReward(nCoinAge, cursorBlock.nBits, tx.nTime) - CTransaction.GetMinFee(1, false, CTransaction.MinFeeMode.GMF_BLOCK, nTxSize) + CTransaction.nCent;
+
+ if (nReward > nCalculatedReward)
+ {
+ return false; // coinstake pays too much
+ }
+ }
+ else
+ {
+ if (nValueIn < tx.nValueOut)
+ {
+ return false; // value in < value out
+ }
+
+ // Tally transaction fees
+ ulong nTxFee = nValueIn - tx.nValueOut;
+ if (nTxFee < 0)
+ {
+ return false; // nTxFee < 0
+ }
+
+ nFees += nTxFee;
+
+ if (!CTransaction.MoneyRange(nFees))
+ {
+ return false; // nFees out of range
+ }
+ }
+
+ }
+
+ return true;
+ }
+
+
+ /// <summary>
+ /// Set new top node or current best chain.
+ /// </summary>
+ /// <param name="cursor"></param>
+ /// <returns></returns>
+ private bool UpdateTopChain(CBlockStoreItem cursor)
+ {
+ ChainParams.HashBestChain = cursor.Hash;
+ ChainParams.nBestChainTrust = cursor.nChainTrust;
+ ChainParams.nBestHeight = cursor.nHeight;
+
+ return dbConn.Update(ChainParams) != 0;
}
/// <summary>
uint nHeight = prevBlockCursor.nHeight + 1;
// Check timestamp against prev
- if (NetUtils.FutureDrift(block.header.nTime) < prevBlockHeader.nTime)
+ if (NetInfo.FutureDrift(block.header.nTime) < prevBlockHeader.nTime)
{
// block's timestamp is too early
return false;
if (!AddItemToIndex(ref itemTemplate, ref block))
{
+ dbConn.Rollback();
+
return false;
}
return true;
}
+ /// <summary>
+ /// GEt block by hash.
+ /// </summary>
+ /// <param name="blockHash">Block hash</param>
+ /// <param name="block">Block object reference</param>
+ /// <param name="nBlockPos">Block position reference</param>
+ /// <returns>Result</returns>
public bool GetBlock(uint256 blockHash, ref CBlock block, ref long nBlockPos)
{
- var reader = new BinaryReader(fStreamReadWrite).BaseStream;
-
- var QueryBlock = dbConn.Query<CBlockStoreItem>("select * from [BlockStorage] where [Hash] = ?", (byte[])blockHash);
+ CBlockStoreItem cursor;
- if (QueryBlock.Count == 1)
+ if (!blockMap.TryGetValue(blockHash, out cursor))
{
- nBlockPos = QueryBlock[0].nBlockPos;
- return QueryBlock[0].ReadFromFile(ref reader, out block);
+ return false; // Unable to fetch block cursor
}
- // Block not found
+ nBlockPos = cursor.nBlockPos;
- return false;
+ return cursor.ReadFromFile(ref fStreamReadWrite, out block);
}
- public bool GetBlockByTransactionID(uint256 TxID, ref CBlock block, ref CTransaction tx, ref long nBlockPos, ref long nTxPos)
+ /// <summary>
+ /// Get block and transaction by transaction hash.
+ /// </summary>
+ /// <param name="TxID">Transaction hash</param>
+ /// <param name="block">Block reference</param>
+ /// <param name="nBlockPos">Block position reference</param>
+ /// <returns>Result of operation</returns>
+ public bool GetBlockByTransactionID(uint256 TxID, ref CBlock block, ref long nBlockPos)
{
- var QueryTx = dbConn.Query<CTransactionStoreItem>("select * from [TransactionStorage] where [TransactionHash] = ?", (byte[])TxID);
+ var queryResult = dbConn.Query<CBlockStoreItem>("select b.* from [BlockStorage] b left join [MerkleNodes] m on (b.[ItemID] = m.[nParentBlockID]) where m.[TransactionHash] = ?", (byte[])TxID);
- if (QueryTx.Count == 1)
+ if (queryResult.Count == 1)
{
- nTxPos = QueryTx[0].nTxPos;
- return GetBlock(QueryTx[0].BlockHash, ref block, ref nBlockPos);
+ CBlockStoreItem blockCursor = queryResult[0];
+
+ return blockCursor.ReadFromFile(ref fStreamReadWrite, out block);
}
// Tx not found
return false;
}
+ public bool GetOutputs(uint256 transactionHash, out Dictionary<COutPoint, TxOutItem> txouts, bool fUnspentOnly=true)
+ {
+ txouts = null;
+
+ var queryParams = new object[] { (byte[])transactionHash, fUnspentOnly ? OutputFlags.AVAILABLE : (OutputFlags.AVAILABLE | OutputFlags.SPENT) };
+ var queryResult = dbConn.Query<TxOutItem>("select o.* from [Outputs] o left join [MerkleNodes] m on m.[nMerkleNodeID] = o.[nMerkleNodeID] where m.[TransactionHash] = ? and outputFlags = ?", queryParams);
+
+ if (queryResult.Count != 0)
+ {
+ txouts = new Dictionary<COutPoint, TxOutItem>();
+
+ foreach (var o in queryResult)
+ {
+ var outpointKey = new COutPoint(transactionHash, o.nOut);
+ var outpointData = o;
+
+ txouts.Add(outpointKey, outpointData);
+ }
+
+ // There are some unspent inputs.
+ return true;
+ }
+
+ // This transaction has been spent completely.
+ 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)
+ public CBlockStoreItem GetMapCursor(uint256 blockHash)
{
if (blockHash == 0)
{
return null;
}
- // First, check our block map.
- CBlockStoreItem item = null;
- if (blockMap.TryGetValue(blockHash, out item))
+ CBlockStoreItem cursor = null;
+ blockMap.TryGetValue(blockHash, out cursor);
+
+ return cursor;
+ }
+
+ /// <summary>
+ /// Get merkle node cursor by output metadata.
+ /// </summary>
+ /// <param name="item">Output metadata object</param>
+ /// <returns>Merkle node cursor or null</returns>
+ public CMerkleNode GetMerkleCursor(TxOutItem item, out CBlockStoreItem blockCursor)
+ {
+ blockCursor = null;
+
+ // Trying to get cursor from the database.
+ var QueryMerkleCursor = dbConn.Query<CMerkleNode>("select * from [MerkleNodes] where [nMerkleNodeID] = ?", item.nMerkleNodeID);
+
+ if (QueryMerkleCursor.Count == 1)
{
- return item;
+ var merkleNode = QueryMerkleCursor[0];
+
+ // Search for block
+ var results = blockMap.Where(x => x.Value.ItemID == merkleNode.nParentBlockID).Select(x => x.Value).ToArray();
+
+ blockCursor = results[0];
}
+ // Nothing found.
+ return null;
+ }
+
+ /// <summary>
+ /// Load cursor from database.
+ /// </summary>
+ /// <param name="blockHash">Block hash</param>
+ /// <returns>Block cursor object</returns>
+ public CBlockStoreItem GetDBCursor(uint256 blockHash)
+ {
// 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];
}
/// <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)
+ /// <param name="cursor">Block cursor</param>
+ /// <returns>Result</returns>
+ public bool UpdateMapCursor(CBlockStoreItem cursor)
{
- if (blockMap.TryUpdate(originalItem.Hash, newItem, originalItem))
- {
- return dbConn.Update(newItem) != 0;
- }
+ var original = blockMap[cursor.Hash];
+ return blockMap.TryUpdate(cursor.Hash, cursor, original);
+ }
- return false;
+ /// <summary>
+ /// Update cursor record in database.
+ /// </summary>
+ /// <param name="cursor">Block cursor object</param>
+ /// <returns>Result</returns>
+ public bool UpdateDBCursor(ref CBlockStoreItem cursor)
+ {
+ return dbConn.Update(cursor) != 0;
}
public bool ProcessBlock(ref CBlock block)
var intBuffer = new byte[4];
var fStream2 = File.OpenRead(BlockFile);
- var readerForBlocks = new BinaryReader(fStream2).BaseStream;
- readerForBlocks.Seek(nOffset, SeekOrigin.Begin); // Seek to previous offset + previous block length
+ fStream2.Seek(nOffset, SeekOrigin.Begin); // Seek to previous offset + previous block length
- dbConn.BeginTransaction();
-
- while (readerForBlocks.Read(buffer, 0, 4) == 4) // Read magic number
+ while (fStream2.Read(buffer, 0, 4) == 4) // Read magic number
{
var nMagic = BitConverter.ToUInt32(buffer, 0);
if (nMagic != 0xe5e9e8e4)
throw new Exception("Incorrect magic number.");
}
- var nBytesRead = readerForBlocks.Read(buffer, 0, 4);
+ var nBytesRead = fStream2.Read(buffer, 0, 4);
if (nBytesRead != 4)
{
throw new Exception("BLKSZ EOF");
var nBlockSize = BitConverter.ToInt32(buffer, 0);
- nOffset = readerForBlocks.Position;
+ nOffset = fStream2.Position;
- nBytesRead = readerForBlocks.Read(buffer, 0, nBlockSize);
+ nBytesRead = fStream2.Read(buffer, 0, nBlockSize);
if (nBytesRead == 0 || nBytesRead != nBlockSize)
{
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();
-
return true;
}
git://git.novaco.in / NovacoinLibrary.git / blobdiff