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Merge pull request #141 from lbryio/fix-testnet-pow

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fix fPowAllowMinDifficultyBlocks to work on the testnet
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lbrynaut 2018-05-21 15:16:24 -05:00 committed by GitHub
commit cd10b981b1
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1 changed files with 8 additions and 19 deletions
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27
src/pow.cpp
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@ -14,31 +14,20 @@
unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params& params)
{
unsigned int nProofOfWorkLimit = UintToArith256(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 (params.fPowAllowMinDifficultyBlocks)
{
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.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)
pindex = pindex->pprev;
return pindex->nBits;
}
// Special difficulty rule for testnet:
// If the new block's timestamp is twice the target block time
// then allow mining of a min-difficulty block.
// This is to prevent the testnet from gettig stuck when a large amount
// of hashrate drops off the network.
if (pblock->GetBlockTime() > pindexLast->GetBlockTime() + params.nPowTargetSpacing*2){
return nProofOfWorkLimit;
}
return pindexLast->nBits;
}
// Go back the full period unless it's the first retarget after genesis.