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main.cpp
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main.cpp
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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2012 The Bitcoin developers
// Copyright (c) 2011-2012 Elacoin Developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "checkpoints.h"
#include "db.h"
#include "net.h"
#include "init.h"
#include "ui_interface.h"
#include <boost/algorithm/string/replace.hpp>
#include <boost/filesystem.hpp>
#include <boost/filesystem/fstream.hpp>
using namespace std;
using namespace boost;
//
// Global state
//
CCriticalSection cs_setpwalletRegistered;
set<CWallet*> setpwalletRegistered;
CCriticalSection cs_main;
CTxMemPool mempool;
unsigned int nTransactionsUpdated = 0;
map<uint256, CBlockIndex*> mapBlockIndex;
uint256 hashGenesisBlock("0x521d2bc9fdb2534f26e5df423db7a64da14892993e4b4f0329c829a5e8194305");
static CBigNum bnProofOfWorkLimit(~uint256(0) >> 20); // Elacoin: starting difficulty
CBlockIndex* pindexGenesisBlock = NULL;
int nBestHeight = -1;
CBigNum bnBestChainWork = 0;
CBigNum bnBestInvalidWork = 0;
uint256 hashBestChain = 0;
CBlockIndex* pindexBest = NULL;
int64 nTimeBestReceived = 0;
CMedianFilter<int> cPeerBlockCounts(5, 0); // Amount of blocks that other nodes claim to have
map<uint256, CBlock*> mapOrphanBlocks;
multimap<uint256, CBlock*> mapOrphanBlocksByPrev;
map<uint256, CDataStream*> mapOrphanTransactions;
map<uint256, map<uint256, CDataStream*> > mapOrphanTransactionsByPrev;
// Constant stuff for coinbase transactions we create:
CScript COINBASE_FLAGS;
const string strMessageMagic = "Elacoin Signed Message:\n";
double dHashesPerSec;
int64 nHPSTimerStart;
// Settings
int64 nTransactionFee = 0;
int64 nMinimumInputValue = CENT / 100;
//////////////////////////////////////////////////////////////////////////////
//
// dispatching functions
//
// These functions dispatch to one or all registered wallets
void RegisterWallet(CWallet* pwalletIn)
{
{
LOCK(cs_setpwalletRegistered);
setpwalletRegistered.insert(pwalletIn);
}
}
void UnregisterWallet(CWallet* pwalletIn)
{
{
LOCK(cs_setpwalletRegistered);
setpwalletRegistered.erase(pwalletIn);
}
}
// check whether the passed transaction is from us
bool static IsFromMe(CTransaction& tx)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
if (pwallet->IsFromMe(tx))
return true;
return false;
}
// get the wallet transaction with the given hash (if it exists)
bool static GetTransaction(const uint256& hashTx, CWalletTx& wtx)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
if (pwallet->GetTransaction(hashTx,wtx))
return true;
return false;
}
// erases transaction with the given hash from all wallets
void static EraseFromWallets(uint256 hash)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
pwallet->EraseFromWallet(hash);
}
// make sure all wallets know about the given transaction, in the given block
void SyncWithWallets(const CTransaction& tx, const CBlock* pblock, bool fUpdate)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
pwallet->AddToWalletIfInvolvingMe(tx, pblock, fUpdate);
}
// notify wallets about a new best chain
void static SetBestChain(const CBlockLocator& loc)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
pwallet->SetBestChain(loc);
}
// notify wallets about an updated transaction
void static UpdatedTransaction(const uint256& hashTx)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
pwallet->UpdatedTransaction(hashTx);
}
// dump all wallets
void static PrintWallets(const CBlock& block)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
pwallet->PrintWallet(block);
}
// notify wallets about an incoming inventory (for request counts)
void static Inventory(const uint256& hash)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
pwallet->Inventory(hash);
}
// ask wallets to resend their transactions
void static ResendWalletTransactions()
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
pwallet->ResendWalletTransactions();
}
//////////////////////////////////////////////////////////////////////////////
//
// mapOrphanTransactions
//
bool AddOrphanTx(const CDataStream& vMsg)
{
CTransaction tx;
CDataStream(vMsg) >> tx;
uint256 hash = tx.GetHash();
if (mapOrphanTransactions.count(hash))
return false;
CDataStream* pvMsg = new CDataStream(vMsg);
// Ignore big transactions, to avoid a
// send-big-orphans memory exhaustion attack. If a peer has a legitimate
// large transaction with a missing parent then we assume
// it will rebroadcast it later, after the parent transaction(s)
// have been mined or received.
// 10,000 orphans, each of which is at most 5,000 bytes big is
// at most 500 megabytes of orphans:
if (pvMsg->size() > 5000)
{
printf("ignoring large orphan tx (size: %u, hash: %s)\n", pvMsg->size(), hash.ToString().substr(0,10).c_str());
delete pvMsg;
return false;
}
mapOrphanTransactions[hash] = pvMsg;
BOOST_FOREACH(const CTxIn& txin, tx.vin)
mapOrphanTransactionsByPrev[txin.prevout.hash].insert(make_pair(hash, pvMsg));
printf("stored orphan tx %s (mapsz %u)\n", hash.ToString().substr(0,10).c_str(),
mapOrphanTransactions.size());
return true;
}
void static EraseOrphanTx(uint256 hash)
{
if (!mapOrphanTransactions.count(hash))
return;
const CDataStream* pvMsg = mapOrphanTransactions[hash];
CTransaction tx;
CDataStream(*pvMsg) >> tx;
BOOST_FOREACH(const CTxIn& txin, tx.vin)
{
mapOrphanTransactionsByPrev[txin.prevout.hash].erase(hash);
if (mapOrphanTransactionsByPrev[txin.prevout.hash].empty())
mapOrphanTransactionsByPrev.erase(txin.prevout.hash);
}
delete pvMsg;
mapOrphanTransactions.erase(hash);
}
unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
{
unsigned int nEvicted = 0;
while (mapOrphanTransactions.size() > nMaxOrphans)
{
// Evict a random orphan:
uint256 randomhash = GetRandHash();
map<uint256, CDataStream*>::iterator it = mapOrphanTransactions.lower_bound(randomhash);
if (it == mapOrphanTransactions.end())
it = mapOrphanTransactions.begin();
EraseOrphanTx(it->first);
++nEvicted;
}
return nEvicted;
}
//////////////////////////////////////////////////////////////////////////////
//
// CTransaction and CTxIndex
//
bool CTransaction::ReadFromDisk(CTxDB& txdb, COutPoint prevout, CTxIndex& txindexRet)
{
SetNull();
if (!txdb.ReadTxIndex(prevout.hash, txindexRet))
return false;
if (!ReadFromDisk(txindexRet.pos))
return false;
if (prevout.n >= vout.size())
{
SetNull();
return false;
}
return true;
}
bool CTransaction::ReadFromDisk(CTxDB& txdb, COutPoint prevout)
{
CTxIndex txindex;
return ReadFromDisk(txdb, prevout, txindex);
}
bool CTransaction::ReadFromDisk(COutPoint prevout)
{
CTxDB txdb("r");
CTxIndex txindex;
return ReadFromDisk(txdb, prevout, txindex);
}
bool CTransaction::IsStandard() const
{
if (nVersion > CTransaction::CURRENT_VERSION)
return false;
BOOST_FOREACH(const CTxIn& txin, vin)
{
// Biggest 'standard' txin is a 3-signature 3-of-3 CHECKMULTISIG
// pay-to-script-hash, which is 3 ~80-byte signatures, 3
// ~65-byte public keys, plus a few script ops.
if (txin.scriptSig.size() > 500)
return false;
if (!txin.scriptSig.IsPushOnly())
return false;
}
BOOST_FOREACH(const CTxOut& txout, vout)
if (!::IsStandard(txout.scriptPubKey))
return false;
return true;
}
//
// Check transaction inputs, and make sure any
// pay-to-script-hash transactions are evaluating IsStandard scripts
//
// Why bother? To avoid denial-of-service attacks; an attacker
// can submit a standard HASH... OP_EQUAL transaction,
// which will get accepted into blocks. The redemption
// script can be anything; an attacker could use a very
// expensive-to-check-upon-redemption script like:
// DUP CHECKSIG DROP ... repeated 100 times... OP_1
//
bool CTransaction::AreInputsStandard(const MapPrevTx& mapInputs) const
{
if (IsCoinBase())
return true; // Coinbases don't use vin normally
for (unsigned int i = 0; i < vin.size(); i++)
{
const CTxOut& prev = GetOutputFor(vin[i], mapInputs);
vector<vector<unsigned char> > vSolutions;
txnouttype whichType;
// get the scriptPubKey corresponding to this input:
const CScript& prevScript = prev.scriptPubKey;
if (!Solver(prevScript, whichType, vSolutions))
return false;
int nArgsExpected = ScriptSigArgsExpected(whichType, vSolutions);
if (nArgsExpected < 0)
return false;
// Transactions with extra stuff in their scriptSigs are
// non-standard. Note that this EvalScript() call will
// be quick, because if there are any operations
// beside "push data" in the scriptSig the
// IsStandard() call returns false
vector<vector<unsigned char> > stack;
if (!EvalScript(stack, vin[i].scriptSig, *this, i, 0))
return false;
if (whichType == TX_SCRIPTHASH)
{
if (stack.empty())
return false;
CScript subscript(stack.back().begin(), stack.back().end());
vector<vector<unsigned char> > vSolutions2;
txnouttype whichType2;
if (!Solver(subscript, whichType2, vSolutions2))
return false;
if (whichType2 == TX_SCRIPTHASH)
return false;
int tmpExpected;
tmpExpected = ScriptSigArgsExpected(whichType2, vSolutions2);
if (tmpExpected < 0)
return false;
nArgsExpected += tmpExpected;
}
if (stack.size() != (unsigned int)nArgsExpected)
return false;
}
return true;
}
unsigned int
CTransaction::GetLegacySigOpCount() const
{
unsigned int nSigOps = 0;
BOOST_FOREACH(const CTxIn& txin, vin)
{
nSigOps += txin.scriptSig.GetSigOpCount(false);
}
BOOST_FOREACH(const CTxOut& txout, vout)
{
nSigOps += txout.scriptPubKey.GetSigOpCount(false);
}
return nSigOps;
}
int CMerkleTx::SetMerkleBranch(const CBlock* pblock)
{
if (fClient)
{
if (hashBlock == 0)
return 0;
}
else
{
CBlock blockTmp;
if (pblock == NULL)
{
// Load the block this tx is in
CTxIndex txindex;
if (!CTxDB("r").ReadTxIndex(GetHash(), txindex))
return 0;
if (!blockTmp.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos))
return 0;
pblock = &blockTmp;
}
// Update the tx's hashBlock
hashBlock = pblock->GetHash();
// Locate the transaction
for (nIndex = 0; nIndex < (int)pblock->vtx.size(); nIndex++)
if (pblock->vtx[nIndex] == *(CTransaction*)this)
break;
if (nIndex == (int)pblock->vtx.size())
{
vMerkleBranch.clear();
nIndex = -1;
printf("ERROR: SetMerkleBranch() : couldn't find tx in block\n");
return 0;
}
// Fill in merkle branch
vMerkleBranch = pblock->GetMerkleBranch(nIndex);
}
// Is the tx in a block that's in the main chain
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
if (mi == mapBlockIndex.end())
return 0;
CBlockIndex* pindex = (*mi).second;
if (!pindex || !pindex->IsInMainChain())
return 0;
return pindexBest->nHeight - pindex->nHeight + 1;
}
bool CTransaction::CheckTransaction() const
{
// Basic checks that don't depend on any context
if (vin.empty())
return DoS(10, error("CTransaction::CheckTransaction() : vin empty"));
if (vout.empty())
return DoS(10, error("CTransaction::CheckTransaction() : vout empty"));
// Size limits
if (::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION) > MAX_BLOCK_SIZE)
return DoS(100, error("CTransaction::CheckTransaction() : size limits failed"));
// Check for negative or overflow output values
int64 nValueOut = 0;
BOOST_FOREACH(const CTxOut& txout, vout)
{
if (txout.nValue < 0)
return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue negative"));
if (txout.nValue > MAX_MONEY)
return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue too high"));
nValueOut += txout.nValue;
if (!MoneyRange(nValueOut))
return DoS(100, error("CTransaction::CheckTransaction() : txout total out of range"));
}
// Check for duplicate inputs
set<COutPoint> vInOutPoints;
BOOST_FOREACH(const CTxIn& txin, vin)
{
if (vInOutPoints.count(txin.prevout))
return false;
vInOutPoints.insert(txin.prevout);
}
if (IsCoinBase())
{
if (vin[0].scriptSig.size() < 2 || vin[0].scriptSig.size() > 100)
return DoS(100, error("CTransaction::CheckTransaction() : coinbase script size"));
}
else
{
BOOST_FOREACH(const CTxIn& txin, vin)
if (txin.prevout.IsNull())
return DoS(10, error("CTransaction::CheckTransaction() : prevout is null"));
}
return true;
}
bool CTxMemPool::accept(CTxDB& txdb, CTransaction &tx, bool fCheckInputs,
bool* pfMissingInputs)
{
if (pfMissingInputs)
*pfMissingInputs = false;
if (!tx.CheckTransaction())
return error("CTxMemPool::accept() : CheckTransaction failed");
// Coinbase is only valid in a block, not as a loose transaction
if (tx.IsCoinBase())
return tx.DoS(100, error("CTxMemPool::accept() : coinbase as individual tx"));
// To help v0.1.5 clients who would see it as a negative number
if ((int64)tx.nLockTime > std::numeric_limits<int>::max())
return error("CTxMemPool::accept() : not accepting nLockTime beyond 2038 yet");
// Rather not work on nonstandard transactions (unless -testnet)
if (!fTestNet && !tx.IsStandard())
return error("CTxMemPool::accept() : nonstandard transaction type");
// Do we already have it?
uint256 hash = tx.GetHash();
{
LOCK(cs);
if (mapTx.count(hash))
return false;
}
if (fCheckInputs)
if (txdb.ContainsTx(hash))
return false;
// Check for conflicts with in-memory transactions
CTransaction* ptxOld = NULL;
for (unsigned int i = 0; i < tx.vin.size(); i++)
{
COutPoint outpoint = tx.vin[i].prevout;
if (mapNextTx.count(outpoint))
{
// Disable replacement feature for now
return false;
// Allow replacing with a newer version of the same transaction
if (i != 0)
return false;
ptxOld = mapNextTx[outpoint].ptx;
if (ptxOld->IsFinal())
return false;
if (!tx.IsNewerThan(*ptxOld))
return false;
for (unsigned int i = 0; i < tx.vin.size(); i++)
{
COutPoint outpoint = tx.vin[i].prevout;
if (!mapNextTx.count(outpoint) || mapNextTx[outpoint].ptx != ptxOld)
return false;
}
break;
}
}
if (fCheckInputs)
{
MapPrevTx mapInputs;
map<uint256, CTxIndex> mapUnused;
bool fInvalid = false;
if (!tx.FetchInputs(txdb, mapUnused, false, false, mapInputs, fInvalid))
{
if (fInvalid)
return error("CTxMemPool::accept() : FetchInputs found invalid tx %s", hash.ToString().substr(0,10).c_str());
if (pfMissingInputs)
*pfMissingInputs = true;
return false;
}
// Check for non-standard pay-to-script-hash in inputs
if (!tx.AreInputsStandard(mapInputs) && !fTestNet)
return error("CTxMemPool::accept() : nonstandard transaction input");
// Note: if you modify this code to accept non-standard transactions, then
// you should add code here to check that the transaction does a
// reasonable number of ECDSA signature verifications.
int64 nFees = tx.GetValueIn(mapInputs)-tx.GetValueOut();
unsigned int nSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
// Don't accept it if it can't get into a block
if (nFees < tx.GetMinFee(1000, true, GMF_RELAY))
return error("CTxMemPool::accept() : not enough fees");
// Continuously rate-limit free transactions
// This mitigates 'penny-flooding' -- sending thousands of free transactions just to
// be annoying or make other's transactions take longer to confirm.
if (nFees < MIN_RELAY_TX_FEE)
{
static CCriticalSection cs;
static double dFreeCount;
static int64 nLastTime;
int64 nNow = GetTime();
{
LOCK(cs);
// Use an exponentially decaying ~10-minute window:
dFreeCount *= pow(1.0 - 1.0/600.0, (double)(nNow - nLastTime));
nLastTime = nNow;
// -limitfreerelay unit is thousand-bytes-per-minute
// At default rate it would take over a month to fill 1GB
if (dFreeCount > GetArg("-limitfreerelay", 15)*10*1000 && !IsFromMe(tx))
return error("CTxMemPool::accept() : free transaction rejected by rate limiter");
if (fDebug)
printf("Rate limit dFreeCount: %g => %g\n", dFreeCount, dFreeCount+nSize);
dFreeCount += nSize;
}
}
// Check against previous transactions
// This is done last to help prevent CPU exhaustion denial-of-service attacks.
if (!tx.ConnectInputs(mapInputs, mapUnused, CDiskTxPos(1,1,1), pindexBest, false, false))
{
return error("CTxMemPool::accept() : ConnectInputs failed %s", hash.ToString().substr(0,10).c_str());
}
}
// Store transaction in memory
{
LOCK(cs);
if (ptxOld)
{
printf("CTxMemPool::accept() : replacing tx %s with new version\n", ptxOld->GetHash().ToString().c_str());
remove(*ptxOld);
}
addUnchecked(hash, tx);
}
///// are we sure this is ok when loading transactions or restoring block txes
// If updated, erase old tx from wallet
if (ptxOld)
EraseFromWallets(ptxOld->GetHash());
printf("CTxMemPool::accept() : accepted %s (poolsz %u)\n",
hash.ToString().substr(0,10).c_str(),
mapTx.size());
return true;
}
bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMissingInputs)
{
return mempool.accept(txdb, *this, fCheckInputs, pfMissingInputs);
}
bool CTxMemPool::addUnchecked(const uint256& hash, CTransaction &tx)
{
// Add to memory pool without checking anything. Don't call this directly,
// call CTxMemPool::accept to properly check the transaction first.
{
mapTx[hash] = tx;
for (unsigned int i = 0; i < tx.vin.size(); i++)
mapNextTx[tx.vin[i].prevout] = CInPoint(&mapTx[hash], i);
nTransactionsUpdated++;
}
return true;
}
bool CTxMemPool::remove(CTransaction &tx)
{
// Remove transaction from memory pool
{
LOCK(cs);
uint256 hash = tx.GetHash();
if (mapTx.count(hash))
{
BOOST_FOREACH(const CTxIn& txin, tx.vin)
mapNextTx.erase(txin.prevout);
mapTx.erase(hash);
nTransactionsUpdated++;
}
}
return true;
}
void CTxMemPool::queryHashes(std::vector<uint256>& vtxid)
{
vtxid.clear();
LOCK(cs);
vtxid.reserve(mapTx.size());
for (map<uint256, CTransaction>::iterator mi = mapTx.begin(); mi != mapTx.end(); ++mi)
vtxid.push_back((*mi).first);
}
int CMerkleTx::GetDepthInMainChain(CBlockIndex* &pindexRet) const
{
if (hashBlock == 0 || nIndex == -1)
return 0;
// Find the block it claims to be in
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
if (mi == mapBlockIndex.end())
return 0;
CBlockIndex* pindex = (*mi).second;
if (!pindex || !pindex->IsInMainChain())
return 0;
// Make sure the merkle branch connects to this block
if (!fMerkleVerified)
{
if (CBlock::CheckMerkleBranch(GetHash(), vMerkleBranch, nIndex) != pindex->hashMerkleRoot)
return 0;
fMerkleVerified = true;
}
pindexRet = pindex;
return pindexBest->nHeight - pindex->nHeight + 1;
}
int CMerkleTx::GetBlocksToMaturity() const
{
if (!IsCoinBase())
return 0;
return max(0, (COINBASE_MATURITY+20) - GetDepthInMainChain());
}
bool CMerkleTx::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs)
{
if (fClient)
{
if (!IsInMainChain() && !ClientConnectInputs())
return false;
return CTransaction::AcceptToMemoryPool(txdb, false);
}
else
{
return CTransaction::AcceptToMemoryPool(txdb, fCheckInputs);
}
}
bool CMerkleTx::AcceptToMemoryPool()
{
CTxDB txdb("r");
return AcceptToMemoryPool(txdb);
}
bool CWalletTx::AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs)
{
{
LOCK(mempool.cs);
// Add previous supporting transactions first
BOOST_FOREACH(CMerkleTx& tx, vtxPrev)
{
if (!tx.IsCoinBase())
{
uint256 hash = tx.GetHash();
if (!mempool.exists(hash) && !txdb.ContainsTx(hash))
tx.AcceptToMemoryPool(txdb, fCheckInputs);
}
}
return AcceptToMemoryPool(txdb, fCheckInputs);
}
return false;
}
bool CWalletTx::AcceptWalletTransaction()
{
CTxDB txdb("r");
return AcceptWalletTransaction(txdb);
}
int CTxIndex::GetDepthInMainChain() const
{
// Read block header
CBlock block;
if (!block.ReadFromDisk(pos.nFile, pos.nBlockPos, false))
return 0;
// Find the block in the index
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(block.GetHash());
if (mi == mapBlockIndex.end())
return 0;
CBlockIndex* pindex = (*mi).second;
if (!pindex || !pindex->IsInMainChain())
return 0;
return 1 + nBestHeight - pindex->nHeight;
}
// Return transaction in tx, and if it was found inside a block, its hash is placed in hashBlock
bool GetTransaction(const uint256 &hash, CTransaction &tx, uint256 &hashBlock)
{
{
LOCK(cs_main);
{
LOCK(mempool.cs);
if (mempool.exists(hash))
{
tx = mempool.lookup(hash);
return true;
}
}
CTxDB txdb("r");
CTxIndex txindex;
if (tx.ReadFromDisk(txdb, COutPoint(hash, 0), txindex))
{
CBlock block;
if (block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
hashBlock = block.GetHash();
return true;
}
}
return false;
}
//////////////////////////////////////////////////////////////////////////////
//
// CBlock and CBlockIndex
//
bool CBlock::ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions)
{
if (!fReadTransactions)
{
*this = pindex->GetBlockHeader();
return true;
}
if (!ReadFromDisk(pindex->nFile, pindex->nBlockPos, fReadTransactions))
return false;
if (GetHash() != pindex->GetBlockHash())
return error("CBlock::ReadFromDisk() : GetHash() doesn't match index");
return true;
}
uint256 static GetOrphanRoot(const CBlock* pblock)
{
// Work back to the first block in the orphan chain
while (mapOrphanBlocks.count(pblock->hashPrevBlock))
pblock = mapOrphanBlocks[pblock->hashPrevBlock];
return pblock->GetHash();
}
static CBlockIndex* pblockindexFBBHLast;
CBlockIndex* FindBlockByHeight(int nHeight)
{
CBlockIndex *pblockindex;
if (nHeight < nBestHeight / 2)
pblockindex = pindexGenesisBlock;
else
pblockindex = pindexBest;
if (pblockindexFBBHLast && abs(nHeight - pblockindex->nHeight) > abs(nHeight - pblockindexFBBHLast->nHeight))
pblockindex = pblockindexFBBHLast;
while (pblockindex->nHeight > nHeight)
pblockindex = pblockindex->pprev;
while (pblockindex->nHeight < nHeight)
pblockindex = pblockindex->pnext;
pblockindexFBBHLast = pblockindex;
return pblockindex;
}
double GetDifficulty2(const CBlockIndex* blockindex)
{
// Floating point number that is a multiple of the minimum difficulty,
// minimum difficulty = 1.0.
if (blockindex == NULL)
{
if (pindexBest == NULL)
return 1.0;
else
blockindex = pindexBest;
}
int nShift = (blockindex->nBits >> 24) & 0xff;
double dDiff =
(double)0x0000ffff / (double)(blockindex->nBits & 0x00ffffff);
while (nShift < 29)
{
dDiff *= 256.0;
nShift++;
}
while (nShift > 29)
{
dDiff /= 256.0;
nShift--;
}
return dDiff;
}
int64 static GetBlockValue(int nHeight, int64 nFees)
{
int64 diff;
int64 nSubsidy;
if(nHeight < 2) {
diff = 1;
} else {
diff = GetDifficulty2(FindBlockByHeight(nHeight-1));
}
//orig elacoin diff/24 but floor()'d by implicit int math makes diff 24 = 1coin, diff 25=2.
// want smooth progression of reward - mat5x
//int64 nSubsidy = ((1 + (diff / 24)) * COIN) / (1 + (nHeight / 194400));
// Elacoin: 194k blocks in ~9 months (270 days @ 2 min/block)
//do our multiplication by elatoshi's COIN base first to avoid int() flooring
// have to divide by reward scaling interval (194400) first tho to avoid overflowing int64
// still gives relatively smooth scaling for diffs > 0.1 - mat5x
if (nHeight < 17820) { // keep original subsidy formula for prefork blocks - mat5x
nSubsidy = ((1 + (diff / 24)) * COIN) / (1 + (nHeight / 194400));
return nSubsidy + nFees;
}
if (nHeight < 18360) {
nSubsidy = COIN; // block value of 1 ELC (COIN elatoshis) til network stabilizes after fork until 8.5 * 2160 blocks - mat5x
return nSubsidy + nFees;
}
if (diff < 1 && nHeight >= 18360)
diff = 1; // elacoin minimum diff = 1 base consideration for block reward, then scale factor on top - mat5x
nSubsidy = diff*COIN; // this many elatoshis for you (base before scale factor) - mat5x
nSubsidy = nSubsidy / (194400 + nHeight); // divide down so we dont blow int64 in the future - mat5x
nSubsidy = nSubsidy * 194400; // mulply it back up to achieve scaling factor on 270d periods - mat5x
return nSubsidy + nFees;
}
static const int64 nTargetTimespan = 3 * 24 * 60 * 60; // Elacoin: 3 days
static const int64 nTargetSpacing = 2 * 60; // Elacoin: 2.5 minutes - no, 2 minutes - mat5x
static const int64 nInterval = nTargetTimespan / nTargetSpacing;
//
// minimum amount of work that could possibly be required nTime after
// minimum work required was nBase
//
unsigned int ComputeMinWork(unsigned int nBase, int64 nTime)
{
// Testnet has min-difficulty blocks
// after nTargetSpacing*2 time between blocks:
if (fTestNet && nTime > nTargetSpacing*2)
return bnProofOfWorkLimit.GetCompact();
CBigNum bnResult;
bnResult.SetCompact(nBase);
while (nTime > 0 && bnResult < bnProofOfWorkLimit)
{
// Maximum 400% adjustment...
bnResult *= 4;
// ... in best-case exactly 4-times-normal target time
nTime -= nTargetTimespan*4;
}
if (bnResult > bnProofOfWorkLimit)
bnResult = bnProofOfWorkLimit;
return bnResult.GetCompact();
}
unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlock *pblock)
{
unsigned int nProofOfWorkLimit = bnProofOfWorkLimit.GetCompact();
int64 maxRetargMult = 4; // maximum retarg multiplier/divider - mat5x
int64 nHeight = pindexLast->nHeight+1; // keep nHeight handy - mat5x
int64 forkBlockNum = 17820; // block # for the fix fork - mat5x
int64 nInterval2 = nInterval; // original default interval, modify below for retargeting for fixfork -- mat5x
int64 nTargetTimespan2 = nTargetTimespan; // original default timespan between retargs, mod below for fixfork -- mat5x
if (nHeight >= forkBlockNum && nHeight < 19440)
{
nInterval2 = nInterval /4; // retarget every 2160/4 blocks between #17280 & #19440 for fixfork -- mat5x
nTargetTimespan2 = nTargetTimespan / 4; // also need to change targetTimeSpan -- mat5x
}
if (nHeight == forkBlockNum || nHeight == forkBlockNum + 270) { // immediate and early retargetting at 8.25 and 8.375 * 2160 block interval - mat5x
maxRetargMult = 16; // diff retarg scale factor made higher for fix fork - mat5x
nInterval2 = nInterval/16; // look back 1/16th of normal interval (2160/16) for retarg of diff to capture actual recent hashrate - mat5x
nTargetTimespan2 = nTargetTimespan/16; // timespan should be 1/16th too of course - mat5x
}
if (nHeight >= 18360 && nHeight <= 18900) // for this range,
maxRetargMult = 8; // reduce factor a bit after 2160/4 blocks before dropping to regular *4 /4 - mat5x
// Genesis block
if (pindexLast == NULL)
return nProofOfWorkLimit;
// Only change once per interval - unless fork start block
if ((pindexLast->nHeight+1) % nInterval2 != 0 && nHeight != forkBlockNum && nHeight != forkBlockNum + 270) // retarg at forkBlockNum and forkBlockNum + 270 and intervals
{
// Special difficulty rule for testnet:
if (fTestNet)
{
// If the new block's timestamp is more than 2* 10 minutes
// then allow mining of a min-difficulty block.
if (pblock->nTime > pindexLast->nTime + nTargetSpacing*2)
return nProofOfWorkLimit;
else
{
// Return the last non-special-min-difficulty-rules-block
const CBlockIndex* pindex = pindexLast;
while (pindex->pprev && pindex->nHeight % nInterval != 0 && pindex->nBits == nProofOfWorkLimit)
pindex = pindex->pprev;
return pindex->nBits;
}
}
return pindexLast->nBits;
}