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Merge pull request #5535

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1c52aad Require sufficent priority for relay of free transactions (Pieter Wuille)
This commit is contained in:
Wladimir J. van der Laan
2015-01-07 13:01:30 +01:00
parent 729ba31749 1c52aad540
commit d79adc1ab1
3 changed files with 8 additions and 2 deletions
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1
src/init.cpp
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@@ -323,6 +323,7 @@ std::string HelpMessage(HelpMessageMode mode)
if (GetBoolArg("-help-debug", false))
{
strUsage += " -limitfreerelay=<n> " + strprintf(_("Continuously rate-limit free transactions to <n>*1000 bytes per minute (default:%u)"), 15) + "\n";
strUsage += " -relaypriority " + strprintf(_("Require high priority for relaying free or low-fee transactions (default:%u)"), 1) + "\n";
strUsage += " -maxsigcachesize=<n> " + strprintf(_("Limit size of signature cache to <n> entries (default: %u)"), 50000) + "\n";
}
strUsage += " -minrelaytxfee=<amt> " + strprintf(_("Fees (in BTC/Kb) smaller than this are considered zero fee for relaying (default: %s)"), FormatMoney(::minRelayTxFee.GetFeePerK())) + "\n";

7
src/main.cpp
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@@ -1030,6 +1030,11 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
hash.ToString(), nFees, txMinFee),
REJECT_INSUFFICIENTFEE, "insufficient fee");
// Require that free transactions have sufficient priority to be mined in the next block.
if (GetBoolArg("-relaypriority", true) && nFees < ::minRelayTxFee.GetFee(nSize) && !AllowFree(view.GetPriority(tx, chainActive.Height() + 1))) {
return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "insufficient priority");
}
// Continuously rate-limit free (really, very-low-fee) transactions
// This mitigates 'penny-flooding' -- sending thousands of free transactions just to
// be annoying or make others' transactions take longer to confirm.
@@ -1049,7 +1054,7 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
// At default rate it would take over a month to fill 1GB
if (dFreeCount >= GetArg("-limitfreerelay", 15)*10*1000)
return state.DoS(0, error("AcceptToMemoryPool : free transaction rejected by rate limiter"),
REJECT_INSUFFICIENTFEE, "insufficient priority");
REJECT_INSUFFICIENTFEE, "rate limited free transaction");
LogPrint("mempool", "Rate limit dFreeCount: %g => %g\n", dFreeCount, dFreeCount+nSize);
dFreeCount += nSize;
}