r1

src/txdb.cpp

@@ -0,0 +1,423 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2014 The Bitcoin developers
+// Copyright (c) 2016-2019 The PIVX developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "txdb.h"
+
+#include "main.h"
+#include "pow.h"
+#include "uint256.h"
+#include "zagr/accumulators.h"
+
+#include <stdint.h>
+
+#include <boost/thread.hpp>
+
+using namespace std;
+using namespace libzerocoin;
+
+void static BatchWriteCoins(CLevelDBBatch& batch, const uint256& hash, const CCoins& coins)
+{
+    if (coins.IsPruned())
+        batch.Erase(make_pair('c', hash));
+    else
+        batch.Write(make_pair('c', hash), coins);
+}
+
+void static BatchWriteHashBestChain(CLevelDBBatch& batch, const uint256& hash)
+{
+    batch.Write('B', hash);
+}
+
+CCoinsViewDB::CCoinsViewDB(size_t nCacheSize, bool fMemory, bool fWipe) : db(GetDataDir() / "chainstate", nCacheSize, fMemory, fWipe)
+{
+}
+
+bool CCoinsViewDB::GetCoins(const uint256& txid, CCoins& coins) const
+{
+    return db.Read(make_pair('c', txid), coins);
+}
+
+bool CCoinsViewDB::HaveCoins(const uint256& txid) const
+{
+    return db.Exists(make_pair('c', txid));
+}
+
+uint256 CCoinsViewDB::GetBestBlock() const
+{
+    uint256 hashBestChain;
+    if (!db.Read('B', hashBestChain))
+        return uint256(0);
+    return hashBestChain;
+}
+
+bool CCoinsViewDB::BatchWrite(CCoinsMap& mapCoins, const uint256& hashBlock)
+{
+    CLevelDBBatch batch;
+    size_t count = 0;
+    size_t changed = 0;
+    for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end();) {
+        if (it->second.flags & CCoinsCacheEntry::DIRTY) {
+            BatchWriteCoins(batch, it->first, it->second.coins);
+            changed++;
+        }
+        count++;
+        CCoinsMap::iterator itOld = it++;
+        mapCoins.erase(itOld);
+    }
+    if (hashBlock != uint256(0))
+        BatchWriteHashBestChain(batch, hashBlock);
+
+    LogPrint("coindb", "Committing %u changed transactions (out of %u) to coin database...\n", (unsigned int)changed, (unsigned int)count);
+    return db.WriteBatch(batch);
+}
+
+CBlockTreeDB::CBlockTreeDB(size_t nCacheSize, bool fMemory, bool fWipe) : CLevelDBWrapper(GetDataDir() / "blocks" / "index", nCacheSize, fMemory, fWipe)
+{
+}
+
+bool CBlockTreeDB::WriteBlockIndex(const CDiskBlockIndex& blockindex)
+{
+    return Write(make_pair('b', blockindex.GetBlockHash()), blockindex);
+}
+
+bool CBlockTreeDB::WriteBlockFileInfo(int nFile, const CBlockFileInfo& info)
+{
+    return Write(make_pair('f', nFile), info);
+}
+
+bool CBlockTreeDB::ReadBlockFileInfo(int nFile, CBlockFileInfo& info)
+{
+    return Read(make_pair('f', nFile), info);
+}
+
+bool CBlockTreeDB::WriteLastBlockFile(int nFile)
+{
+    return Write('l', nFile);
+}
+
+bool CBlockTreeDB::WriteReindexing(bool fReindexing)
+{
+    if (fReindexing)
+        return Write('R', '1');
+    else
+        return Erase('R');
+}
+
+bool CBlockTreeDB::ReadReindexing(bool& fReindexing)
+{
+    fReindexing = Exists('R');
+    return true;
+}
+
+bool CBlockTreeDB::ReadLastBlockFile(int& nFile)
+{
+    return Read('l', nFile);
+}
+
+bool CCoinsViewDB::GetStats(CCoinsStats& stats) const
+{
+    /* It seems that there are no "const iterators" for LevelDB.  Since we
+       only need read operations on it, use a const-cast to get around
+       that restriction.  */
+    boost::scoped_ptr<leveldb::Iterator> pcursor(const_cast<CLevelDBWrapper*>(&db)->NewIterator());
+    pcursor->SeekToFirst();
+
+    CHashWriter ss(SER_GETHASH, PROTOCOL_VERSION);
+    stats.hashBlock = GetBestBlock();
+    ss << stats.hashBlock;
+    CAmount nTotalAmount = 0;
+    while (pcursor->Valid()) {
+        boost::this_thread::interruption_point();
+        try {
+            leveldb::Slice slKey = pcursor->key();
+            CDataStream ssKey(slKey.data(), slKey.data() + slKey.size(), SER_DISK, CLIENT_VERSION);
+            char chType;
+            ssKey >> chType;
+            if (chType == 'c') {
+                leveldb::Slice slValue = pcursor->value();
+                CDataStream ssValue(slValue.data(), slValue.data() + slValue.size(), SER_DISK, CLIENT_VERSION);
+                CCoins coins;
+                ssValue >> coins;
+                uint256 txhash;
+                ssKey >> txhash;
+                ss << txhash;
+                ss << VARINT(coins.nVersion);
+                ss << (coins.fCoinBase ? 'c' : 'n');
+                ss << VARINT(coins.nHeight);
+                stats.nTransactions++;
+                for (unsigned int i = 0; i < coins.vout.size(); i++) {
+                    const CTxOut& out = coins.vout[i];
+                    if (!out.IsNull()) {
+                        stats.nTransactionOutputs++;
+                        ss << VARINT(i + 1);
+                        ss << out;
+                        nTotalAmount += out.nValue;
+                    }
+                }
+                stats.nSerializedSize += 32 + slValue.size();
+                ss << VARINT(0);
+            }
+            pcursor->Next();
+        } catch (std::exception& e) {
+            return error("%s : Deserialize or I/O error - %s", __func__, e.what());
+        }
+    }
+    stats.nHeight = mapBlockIndex.find(GetBestBlock())->second->nHeight;
+    stats.hashSerialized = ss.GetHash();
+    stats.nTotalAmount = nTotalAmount;
+    return true;
+}
+
+bool CBlockTreeDB::ReadTxIndex(const uint256& txid, CDiskTxPos& pos)
+{
+    return Read(make_pair('t', txid), pos);
+}
+
+bool CBlockTreeDB::WriteTxIndex(const std::vector<std::pair<uint256, CDiskTxPos> >& vect)
+{
+    CLevelDBBatch batch;
+    for (std::vector<std::pair<uint256, CDiskTxPos> >::const_iterator it = vect.begin(); it != vect.end(); it++)
+        batch.Write(make_pair('t', it->first), it->second);
+    return WriteBatch(batch);
+}
+
+bool CBlockTreeDB::WriteFlag(const std::string& name, bool fValue)
+{
+    return Write(std::make_pair('F', name), fValue ? '1' : '0');
+}
+
+bool CBlockTreeDB::ReadFlag(const std::string& name, bool& fValue)
+{
+    char ch;
+    if (!Read(std::make_pair('F', name), ch))
+        return false;
+    fValue = ch == '1';
+    return true;
+}
+
+bool CBlockTreeDB::WriteInt(const std::string& name, int nValue)
+{
+    return Write(std::make_pair('I', name), nValue);
+}
+
+bool CBlockTreeDB::ReadInt(const std::string& name, int& nValue)
+{
+    return Read(std::make_pair('I', name), nValue);
+}
+
+bool CBlockTreeDB::LoadBlockIndexGuts()
+{
+    boost::scoped_ptr<leveldb::Iterator> pcursor(NewIterator());
+
+    CDataStream ssKeySet(SER_DISK, CLIENT_VERSION);
+    ssKeySet << make_pair('b', uint256(0));
+    pcursor->Seek(ssKeySet.str());
+
+    // Load mapBlockIndex
+    uint256 nPreviousCheckpoint;
+    while (pcursor->Valid()) {
+        boost::this_thread::interruption_point();
+        try {
+            leveldb::Slice slKey = pcursor->key();
+            CDataStream ssKey(slKey.data(), slKey.data() + slKey.size(), SER_DISK, CLIENT_VERSION);
+            char chType;
+            ssKey >> chType;
+            if (chType == 'b') {
+                leveldb::Slice slValue = pcursor->value();
+                CDataStream ssValue(slValue.data(), slValue.data() + slValue.size(), SER_DISK, CLIENT_VERSION);
+                CDiskBlockIndex diskindex;
+                ssValue >> diskindex;
+
+                // Construct block index object
+                CBlockIndex* pindexNew = InsertBlockIndex(diskindex.GetBlockHash());
+                pindexNew->pprev = InsertBlockIndex(diskindex.hashPrev);
+                pindexNew->pnext = InsertBlockIndex(diskindex.hashNext);
+                pindexNew->nHeight = diskindex.nHeight;
+                pindexNew->nFile = diskindex.nFile;
+                pindexNew->nDataPos = diskindex.nDataPos;
+                pindexNew->nUndoPos = diskindex.nUndoPos;
+                pindexNew->nVersion = diskindex.nVersion;
+                pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;
+                pindexNew->nTime = diskindex.nTime;
+                pindexNew->nBits = diskindex.nBits;
+                pindexNew->nNonce = diskindex.nNonce;
+                pindexNew->nStatus = diskindex.nStatus;
+                pindexNew->nTx = diskindex.nTx;
+
+                //zerocoin
+                pindexNew->nAccumulatorCheckpoint = diskindex.nAccumulatorCheckpoint;
+                pindexNew->mapZerocoinSupply = diskindex.mapZerocoinSupply;
+                pindexNew->vMintDenominationsInBlock = diskindex.vMintDenominationsInBlock;
+
+                //Proof Of Stake
+                pindexNew->nMint = diskindex.nMint;
+                pindexNew->nMoneySupply = diskindex.nMoneySupply;
+                pindexNew->nFlags = diskindex.nFlags;
+                pindexNew->nStakeModifier = diskindex.nStakeModifier;
+                pindexNew->prevoutStake = diskindex.prevoutStake;
+                pindexNew->nStakeTime = diskindex.nStakeTime;
+                pindexNew->hashProofOfStake = diskindex.hashProofOfStake;
+
+                if (pindexNew->nHeight <= Params().LAST_POW_BLOCK()) {
+                    if (!CheckProofOfWork(pindexNew->GetBlockHash(), pindexNew->nBits))
+                        return error("LoadBlockIndex() : CheckProofOfWork failed: %s", pindexNew->ToString());
+                }
+
+                //populate accumulator checksum map in memory
+                if(pindexNew->nAccumulatorCheckpoint != 0 && pindexNew->nAccumulatorCheckpoint != nPreviousCheckpoint) {
+                    //Don't load any checkpoints that exist before v2 zagr. The accumulator is invalid for v1 and not used.
+                    if (pindexNew->nHeight >= Params().Zerocoin_Block_V2_Start())
+                        LoadAccumulatorValuesFromDB(pindexNew->nAccumulatorCheckpoint);
+
+                    nPreviousCheckpoint = pindexNew->nAccumulatorCheckpoint;
+                }
+
+                pcursor->Next();
+            } else {
+                break; // if shutdown requested or finished loading block index
+            }
+        } catch (std::exception& e) {
+            return error("%s : Deserialize or I/O error - %s", __func__, e.what());
+        }
+    }
+
+    return true;
+}
+
+CZerocoinDB::CZerocoinDB(size_t nCacheSize, bool fMemory, bool fWipe) : CLevelDBWrapper(GetDataDir() / "zerocoin", nCacheSize, fMemory, fWipe)
+{
+}
+
+bool CZerocoinDB::WriteCoinMintBatch(const std::vector<std::pair<libzerocoin::PublicCoin, uint256> >& mintInfo)
+{
+    CLevelDBBatch batch;
+    size_t count = 0;
+    for (std::vector<std::pair<libzerocoin::PublicCoin, uint256> >::const_iterator it=mintInfo.begin(); it != mintInfo.end(); it++) {
+        PublicCoin pubCoin = it->first;
+        uint256 hash = GetPubCoinHash(pubCoin.getValue());
+        batch.Write(make_pair('m', hash), it->second);
+        ++count;
+    }
+
+    LogPrint("zero", "Writing %u coin mints to db.\n", (unsigned int)count);
+    return WriteBatch(batch, true);
+}
+
+bool CZerocoinDB::ReadCoinMint(const CBigNum& bnPubcoin, uint256& hashTx)
+{
+    return ReadCoinMint(GetPubCoinHash(bnPubcoin), hashTx);
+}
+
+bool CZerocoinDB::ReadCoinMint(const uint256& hashPubcoin, uint256& hashTx)
+{
+    return Read(make_pair('m', hashPubcoin), hashTx);
+}
+
+bool CZerocoinDB::EraseCoinMint(const CBigNum& bnPubcoin)
+{
+    uint256 hash = GetPubCoinHash(bnPubcoin);
+    return Erase(make_pair('m', hash));
+}
+
+bool CZerocoinDB::WriteCoinSpendBatch(const std::vector<std::pair<libzerocoin::CoinSpend, uint256> >& spendInfo)
+{
+    CLevelDBBatch batch;
+    size_t count = 0;
+    for (std::vector<std::pair<libzerocoin::CoinSpend, uint256> >::const_iterator it=spendInfo.begin(); it != spendInfo.end(); it++) {
+        CBigNum bnSerial = it->first.getCoinSerialNumber();
+        CDataStream ss(SER_GETHASH, 0);
+        ss << bnSerial;
+        uint256 hash = Hash(ss.begin(), ss.end());
+        batch.Write(make_pair('s', hash), it->second);
+        ++count;
+    }
+
+    LogPrint("zero", "Writing %u coin spends to db.\n", (unsigned int)count);
+    return WriteBatch(batch, true);
+}
+
+bool CZerocoinDB::ReadCoinSpend(const CBigNum& bnSerial, uint256& txHash)
+{
+    CDataStream ss(SER_GETHASH, 0);
+    ss << bnSerial;
+    uint256 hash = Hash(ss.begin(), ss.end());
+
+    return Read(make_pair('s', hash), txHash);
+}
+
+bool CZerocoinDB::ReadCoinSpend(const uint256& hashSerial, uint256 &txHash)
+{
+    return Read(make_pair('s', hashSerial), txHash);
+}
+
+bool CZerocoinDB::EraseCoinSpend(const CBigNum& bnSerial)
+{
+    CDataStream ss(SER_GETHASH, 0);
+    ss << bnSerial;
+    uint256 hash = Hash(ss.begin(), ss.end());
+
+    return Erase(make_pair('s', hash));
+}
+
+bool CZerocoinDB::WipeCoins(std::string strType)
+{
+    if (strType != "spends" && strType != "mints")
+        return error("%s: did not recognize type %s", __func__, strType);
+
+    boost::scoped_ptr<leveldb::Iterator> pcursor(NewIterator());
+
+    char type = (strType == "spends" ? 's' : 'm');
+    CDataStream ssKeySet(SER_DISK, CLIENT_VERSION);
+    ssKeySet << make_pair(type, uint256(0));
+    pcursor->Seek(ssKeySet.str());
+    // Load mapBlockIndex
+    std::set<uint256> setDelete;
+    while (pcursor->Valid()) {
+        boost::this_thread::interruption_point();
+        try {
+            leveldb::Slice slKey = pcursor->key();
+            CDataStream ssKey(slKey.data(), slKey.data() + slKey.size(), SER_DISK, CLIENT_VERSION);
+            char chType;
+            ssKey >> chType;
+            if (chType == type) {
+                leveldb::Slice slValue = pcursor->value();
+                CDataStream ssValue(slValue.data(), slValue.data() + slValue.size(), SER_DISK, CLIENT_VERSION);
+                uint256 hash;
+                ssValue >> hash;
+                setDelete.insert(hash);
+                pcursor->Next();
+            } else {
+                break; // if shutdown requested or finished loading block index
+            }
+        } catch (std::exception& e) {
+            return error("%s : Deserialize or I/O error - %s", __func__, e.what());
+        }
+    }
+
+    for (auto& hash : setDelete) {
+        if (!Erase(make_pair(type, hash)))
+            LogPrintf("%s: error failed to delete %s\n", __func__, hash.GetHex());
+    }
+
+    return true;
+}
+
+bool CZerocoinDB::WriteAccumulatorValue(const uint32_t& nChecksum, const CBigNum& bnValue)
+{
+    LogPrint("zero","%s : checksum:%d val:%s\n", __func__, nChecksum, bnValue.GetHex());
+    return Write(make_pair('2', nChecksum), bnValue);
+}
+
+bool CZerocoinDB::ReadAccumulatorValue(const uint32_t& nChecksum, CBigNum& bnValue)
+{
+    return Read(make_pair('2', nChecksum), bnValue);
+}
+
+bool CZerocoinDB::EraseAccumulatorValue(const uint32_t& nChecksum)
+{
+    LogPrint("zero", "%s : checksum:%d\n", __func__, nChecksum);
+    return Erase(make_pair('2', nChecksum));
+}