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Consensus: Refactor: Decouple pow.o from chainparams.o

Browse Source
pull/262/head
Jorge Timón 10 years ago
parent bd006110fb
commit d698ef690f
8 changed files with 42 additions and 35 deletions
Show Stats Download Patch File Download Diff File

6
src/main.cpp
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@ -1158,7 +1158,7 @@ bool ReadBlockFromDisk(CBlock& block, const CDiskBlockPos& pos)
}
// Check the header
if (!CheckProofOfWork(block.GetHash(), block.nBits))
if (!CheckProofOfWork(block.GetHash(), block.nBits, Params().GetConsensus()))
return error("ReadBlockFromDisk: Errors in block header at %s", pos.ToString());
return true;
@ -2462,7 +2462,7 @@ bool FindUndoPos(CValidationState &state, int nFile, CDiskBlockPos &pos, unsigne
bool CheckBlockHeader(const CBlockHeader& block, CValidationState& state, bool fCheckPOW)
{
// Check proof of work matches claimed amount
if (fCheckPOW && !CheckProofOfWork(block.GetHash(), block.nBits))
if (fCheckPOW && !CheckProofOfWork(block.GetHash(), block.nBits, Params().GetConsensus()))
return state.DoS(50, error("CheckBlockHeader(): proof of work failed"),
REJECT_INVALID, "high-hash");
@ -2545,7 +2545,7 @@ bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& sta
int nHeight = pindexPrev->nHeight+1;
// Check proof of work
if ((block.nBits != GetNextWorkRequired(pindexPrev, &block)))
if (block.nBits != GetNextWorkRequired(pindexPrev, &block, Params().GetConsensus()))
return state.DoS(100, error("%s: incorrect proof of work", __func__),
REJECT_INVALID, "bad-diffbits");

1
src/main.h
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@ -17,7 +17,6 @@
#include "primitives/block.h"
#include "primitives/transaction.h"
#include "net.h"
#include "pow.h"
#include "script/script.h"
#include "script/sigcache.h"
#include "script/standard.h"

4
src/miner.cpp
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@ -84,7 +84,7 @@ void UpdateTime(CBlockHeader* pblock, const CBlockIndex* pindexPrev)
// Updating time can change work required on testnet:
if (Params().AllowMinDifficultyBlocks())
pblock->nBits = GetNextWorkRequired(pindexPrev, pblock);
pblock->nBits = GetNextWorkRequired(pindexPrev, pblock, Params().GetConsensus());
}
CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn)
@ -326,7 +326,7 @@ CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn)
// Fill in header
pblock->hashPrevBlock = pindexPrev->GetBlockHash();
UpdateTime(pblock, pindexPrev);
pblock->nBits = GetNextWorkRequired(pindexPrev, pblock);
pblock->nBits = GetNextWorkRequired(pindexPrev, pblock, Params().GetConsensus());
pblock->nNonce = 0;
pblocktemplate->vTxSigOps[0] = GetLegacySigOpCount(pblock->vtx[0]);

39
src/pow.cpp
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@ -7,34 +7,33 @@
#include "arith_uint256.h"
#include "chain.h"
#include "chainparams.h"
#include "primitives/block.h"
#include "uint256.h"
#include "util.h"
unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock)
unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params& params)
{
unsigned int nProofOfWorkLimit = Params().ProofOfWorkLimit().GetCompact();
unsigned int nProofOfWorkLimit = params.powLimit.GetCompact();
// Genesis block
if (pindexLast == NULL)
return nProofOfWorkLimit;
// Only change once per difficulty adjustment interval
if ((pindexLast->nHeight+1) % Params().DifficultyAdjustmentInterval() != 0)
if ((pindexLast->nHeight+1) % params.DifficultyAdjustmentInterval() != 0)
{
if (Params().AllowMinDifficultyBlocks())
if (params.fPowAllowMinDifficultyBlocks)
{
// Special difficulty rule for testnet:
// If the new block's timestamp is more than 2* 10 minutes
// then allow mining of a min-difficulty block.
if (pblock->GetBlockTime() > pindexLast->GetBlockTime() + Params().TargetSpacing()*2)
if (pblock->GetBlockTime() > pindexLast->GetBlockTime() + params.nPowTargetSpacing*2)
return nProofOfWorkLimit;
else
{
// Return the last non-special-min-difficulty-rules-block
const CBlockIndex* pindex = pindexLast;
while (pindex->pprev && pindex->nHeight % Params().DifficultyAdjustmentInterval() != 0 && pindex->nBits == nProofOfWorkLimit)
while (pindex->pprev && pindex->nHeight % params.DifficultyAdjustmentInterval() != 0 && pindex->nBits == nProofOfWorkLimit)
pindex = pindex->pprev;
return pindex->nBits;
}
@ -44,22 +43,22 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
// Go back by what we want to be 14 days worth of blocks
const CBlockIndex* pindexFirst = pindexLast;
for (int i = 0; pindexFirst && i < Params().DifficultyAdjustmentInterval()-1; i++)
for (int i = 0; pindexFirst && i < params.DifficultyAdjustmentInterval()-1; i++)
pindexFirst = pindexFirst->pprev;
assert(pindexFirst);
return CalculateNextWorkRequired(pindexLast, pindexFirst->GetBlockTime());
return CalculateNextWorkRequired(pindexLast, pindexFirst->GetBlockTime(), params);
}
unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime)
unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime, const Consensus::Params& params)
{
// Limit adjustment step
int64_t nActualTimespan = pindexLast->GetBlockTime() - nFirstBlockTime;
LogPrintf(" nActualTimespan = %d before bounds\n", nActualTimespan);
if (nActualTimespan < Params().TargetTimespan()/4)
nActualTimespan = Params().TargetTimespan()/4;
if (nActualTimespan > Params().TargetTimespan()*4)
nActualTimespan = Params().TargetTimespan()*4;
if (nActualTimespan < params.nPowTargetTimespan/4)
nActualTimespan = params.nPowTargetTimespan/4;
if (nActualTimespan > params.nPowTargetTimespan*4)
nActualTimespan = params.nPowTargetTimespan*4;
// Retarget
arith_uint256 bnNew;
@ -67,21 +66,21 @@ unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nF
bnNew.SetCompact(pindexLast->nBits);
bnOld = bnNew;
bnNew *= nActualTimespan;
bnNew /= Params().TargetTimespan();
bnNew /= params.nPowTargetTimespan;
if (bnNew > Params().ProofOfWorkLimit())
bnNew = Params().ProofOfWorkLimit();
if (bnNew > params.powLimit)
bnNew = params.powLimit;
/// debug print
LogPrintf("GetNextWorkRequired RETARGET\n");
LogPrintf("Params().TargetTimespan() = %d nActualTimespan = %d\n", Params().TargetTimespan(), nActualTimespan);
LogPrintf("params.nPowTargetTimespan = %d nActualTimespan = %d\n", params.nPowTargetTimespan, nActualTimespan);
LogPrintf("Before: %08x %s\n", pindexLast->nBits, bnOld.ToString());
LogPrintf("After: %08x %s\n", bnNew.GetCompact(), bnNew.ToString());
return bnNew.GetCompact();
}
bool CheckProofOfWork(uint256 hash, unsigned int nBits)
bool CheckProofOfWork(uint256 hash, unsigned int nBits, const Consensus::Params& params)
{
bool fNegative;
bool fOverflow;
@ -90,7 +89,7 @@ bool CheckProofOfWork(uint256 hash, unsigned int nBits)
bnTarget.SetCompact(nBits, &fNegative, &fOverflow);
// Check range
if (fNegative || bnTarget == 0 || fOverflow || bnTarget > Params().ProofOfWorkLimit())
if (fNegative || bnTarget == 0 || fOverflow || bnTarget > params.powLimit)
return error("CheckProofOfWork(): nBits below minimum work");
// Check proof of work matches claimed amount

8
src/pow.h
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@ -6,6 +6,8 @@
#ifndef BITCOIN_POW_H
#define BITCOIN_POW_H
#include "consensus/params.h"
#include <stdint.h>
class CBlockHeader;
@ -13,11 +15,11 @@ class CBlockIndex;
class uint256;
class arith_uint256;
unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock);
unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime);
unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params&);
unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime, const Consensus::Params&);
/** Check whether a block hash satisfies the proof-of-work requirement specified by nBits */
bool CheckProofOfWork(uint256 hash, unsigned int nBits);
bool CheckProofOfWork(uint256 hash, unsigned int nBits, const Consensus::Params&);
arith_uint256 GetBlockProof(const CBlockIndex& block);
#endif // BITCOIN_POW_H

2
src/rpcmining.cpp
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@ -181,7 +181,7 @@ Value setgenerate(const Array& params, bool fHelp)
LOCK(cs_main);
IncrementExtraNonce(pblock, chainActive.Tip(), nExtraNonce);
}
while (!CheckProofOfWork(pblock->GetHash(), pblock->nBits)) {
while (!CheckProofOfWork(pblock->GetHash(), pblock->nBits, Params().GetConsensus())) {
// Yes, there is a chance every nonce could fail to satisfy the -regtest
// target -- 1 in 2^(2^32). That ain't gonna happen.
++pblock->nNonce;

13
src/test/pow_tests.cpp
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@ -17,51 +17,56 @@ BOOST_FIXTURE_TEST_SUITE(pow_tests, BasicTestingSetup)
BOOST_AUTO_TEST_CASE(get_next_work)
{
SelectParams(CBaseChainParams::MAIN);
const Consensus::Params& params = Params().GetConsensus();
int64_t nLastRetargetTime = 1261130161; // Block #30240
CBlockIndex pindexLast;
pindexLast.nHeight = 32255;
pindexLast.nTime = 1262152739; // Block #32255
pindexLast.nBits = 0x1d00ffff;
BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime), 0x1d00d86a);
BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1d00d86a);
}
/* Test the constraint on the upper bound for next work */
BOOST_AUTO_TEST_CASE(get_next_work_pow_limit)
{
SelectParams(CBaseChainParams::MAIN);
const Consensus::Params& params = Params().GetConsensus();
int64_t nLastRetargetTime = 1231006505; // Block #0
CBlockIndex pindexLast;
pindexLast.nHeight = 2015;
pindexLast.nTime = 1233061996; // Block #2015
pindexLast.nBits = 0x1d00ffff;
BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime), 0x1d00ffff);
BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1d00ffff);
}
/* Test the constraint on the lower bound for actual time taken */
BOOST_AUTO_TEST_CASE(get_next_work_lower_limit_actual)
{
SelectParams(CBaseChainParams::MAIN);
const Consensus::Params& params = Params().GetConsensus();
int64_t nLastRetargetTime = 1279008237; // Block #66528
CBlockIndex pindexLast;
pindexLast.nHeight = 68543;
pindexLast.nTime = 1279297671; // Block #68543
pindexLast.nBits = 0x1c05a3f4;
BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime), 0x1c0168fd);
BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1c0168fd);
}
/* Test the constraint on the upper bound for actual time taken */
BOOST_AUTO_TEST_CASE(get_next_work_upper_limit_actual)
{
SelectParams(CBaseChainParams::MAIN);
const Consensus::Params& params = Params().GetConsensus();
int64_t nLastRetargetTime = 1263163443; // NOTE: Not an actual block time
CBlockIndex pindexLast;
pindexLast.nHeight = 46367;
pindexLast.nTime = 1269211443; // Block #46367
pindexLast.nBits = 0x1c387f6f;
BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime), 0x1d00e1fd);
BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1d00e1fd);
}
BOOST_AUTO_TEST_SUITE_END()

4
src/txdb.cpp
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@ -5,6 +5,8 @@
#include "txdb.h"
#include "chainparams.h"
#include "hash.h"
#include "main.h"
#include "pow.h"
#include "uint256.h"
@ -223,7 +225,7 @@ bool CBlockTreeDB::LoadBlockIndexGuts()
pindexNew->nStatus = diskindex.nStatus;
pindexNew->nTx = diskindex.nTx;
if (!CheckProofOfWork(pindexNew->GetBlockHash(), pindexNew->nBits))
if (!CheckProofOfWork(pindexNew->GetBlockHash(), pindexNew->nBits, Params().GetConsensus()))
return error("LoadBlockIndex(): CheckProofOfWork failed: %s", pindexNew->ToString());
pcursor->Next();

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