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bitcoin
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move pow constants to chainparams

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pull/3839/head
jtimon 11 years ago
parent df852d2bcc
commit fd704c7b2c
3 changed files with 25 additions and 17 deletions
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7
src/chainparams.cpp
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@ -117,6 +117,8 @@ public:
nRejectBlockOutdatedMajority = 950;
nToCheckBlockUpgradeMajority = 1000;
nMinerThreads = 0;
nTargetTimespan = 14 * 24 * 60 * 60; // two weeks
nTargetSpacing = 10 * 60;
// Build the genesis block. Note that the output of the genesis coinbase cannot
// be spent as it did not originally exist in the database.
@ -204,6 +206,9 @@ public:
nEnforceBlockUpgradeMajority = 51;
nRejectBlockOutdatedMajority = 75;
nToCheckBlockUpgradeMajority = 100;
nMinerThreads = 0;
nTargetTimespan = 14 * 24 * 60 * 60; // two weeks
nTargetSpacing = 10 * 60;
strDataDir = "testnet3";
// Modify the testnet genesis block so the timestamp is valid for a later start.
@ -251,6 +256,8 @@ public:
nRejectBlockOutdatedMajority = 950;
nToCheckBlockUpgradeMajority = 1000;
nMinerThreads = 1;
nTargetTimespan = 14 * 24 * 60 * 60; // two weeks
nTargetSpacing = 10 * 60;
bnProofOfWorkLimit = ~uint256(0) >> 1;
genesis.nTime = 1296688602;
genesis.nBits = 0x207fffff;

5
src/chainparams.h
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@ -70,6 +70,9 @@ public:
bool AllowMinDifficultyBlocks() const { return fAllowMinDifficultyBlocks; }
/* Make standard checks */
bool RequireStandard() const { return fRequireStandard; }
int64_t TargetTimespan() const { return nTargetTimespan; }
int64_t TargetSpacing() const { return nTargetSpacing; }
int64_t Interval() const { return nTargetTimespan / nTargetSpacing; }
const std::string& DataDir() const { return strDataDir; }
/* Make miner stop after a block is found. In RPC, don't return
* until nGenProcLimit blocks are generated */
@ -95,6 +98,8 @@ protected:
int nEnforceBlockUpgradeMajority;
int nRejectBlockOutdatedMajority;
int nToCheckBlockUpgradeMajority;
int64_t nTargetTimespan;
int64_t nTargetSpacing;
std::string strDataDir;
int nMinerThreads;
std::vector<CDNSSeedData> vSeeds;

30
src/pow.cpp
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@ -10,10 +10,6 @@
#include "main.h"
#include "uint256.h"
static const int64_t nTargetTimespan = 14 * 24 * 60 * 60; // two weeks
static const int64_t nTargetSpacing = 10 * 60;
static const int64_t nInterval = nTargetTimespan / nTargetSpacing;
unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock)
{
unsigned int nProofOfWorkLimit = Params().ProofOfWorkLimit().GetCompact();
@ -23,20 +19,20 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
return nProofOfWorkLimit;
// Only change once per interval
if ((pindexLast->nHeight+1) % nInterval != 0)
if ((pindexLast->nHeight+1) % Params().Interval() != 0)
{
if (Params().AllowMinDifficultyBlocks())
{
// 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->nTime > pindexLast->nTime + nTargetSpacing*2)
if (pblock->nTime > pindexLast->nTime + Params().TargetSpacing()*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)
while (pindex->pprev && pindex->nHeight % Params().Interval() != 0 && pindex->nBits == nProofOfWorkLimit)
pindex = pindex->pprev;
return pindex->nBits;
}
@ -46,17 +42,17 @@ 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 < nInterval-1; i++)
for (int i = 0; pindexFirst && i < Params().Interval()-1; i++)
pindexFirst = pindexFirst->pprev;
assert(pindexFirst);
// Limit adjustment step
int64_t nActualTimespan = pindexLast->GetBlockTime() - pindexFirst->GetBlockTime();
LogPrintf(" nActualTimespan = %d before bounds\n", nActualTimespan);
if (nActualTimespan < nTargetTimespan/4)
nActualTimespan = nTargetTimespan/4;
if (nActualTimespan > nTargetTimespan*4)
nActualTimespan = nTargetTimespan*4;
if (nActualTimespan < Params().TargetTimespan()/4)
nActualTimespan = Params().TargetTimespan()/4;
if (nActualTimespan > Params().TargetTimespan()*4)
nActualTimespan = Params().TargetTimespan()*4;
// Retarget
uint256 bnNew;
@ -64,14 +60,14 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
bnNew.SetCompact(pindexLast->nBits);
bnOld = bnNew;
bnNew *= nActualTimespan;
bnNew /= nTargetTimespan;
bnNew /= Params().TargetTimespan();
if (bnNew > Params().ProofOfWorkLimit())
bnNew = Params().ProofOfWorkLimit();
/// debug print
LogPrintf("GetNextWorkRequired RETARGET\n");
LogPrintf("nTargetTimespan = %d nActualTimespan = %d\n", nTargetTimespan, nActualTimespan);
LogPrintf("Params().TargetTimespan() = %d nActualTimespan = %d\n", Params().TargetTimespan(), nActualTimespan);
LogPrintf("Before: %08x %s\n", pindexLast->nBits, bnOld.ToString());
LogPrintf("After: %08x %s\n", bnNew.GetCompact(), bnNew.ToString());
@ -104,8 +100,8 @@ unsigned int ComputeMinWork(unsigned int nBase, int64_t nTime)
{
const uint256 &bnLimit = Params().ProofOfWorkLimit();
// Testnet has min-difficulty blocks
// after nTargetSpacing*2 time between blocks:
if (Params().AllowMinDifficultyBlocks() && nTime > nTargetSpacing*2)
// after Params().TargetSpacing()*2 time between blocks:
if (Params().AllowMinDifficultyBlocks() && nTime > Params().TargetSpacing()*2)
return bnLimit.GetCompact();
uint256 bnResult;
@ -115,7 +111,7 @@ unsigned int ComputeMinWork(unsigned int nBase, int64_t nTime)
// Maximum 400% adjustment...
bnResult *= 4;
// ... in best-case exactly 4-times-normal target time
nTime -= nTargetTimespan*4;
nTime -= Params().TargetTimespan()*4;
}
if (bnResult > bnLimit)
bnResult = bnLimit;

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