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Require sufficent priority for relay of free transactions

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Rebased-From: 1c52aad540ec1370db60fd68fc3485413e3cb8e1
Github-Pull: #5535
This commit is contained in:
Pieter Wuille 2014-12-23 23:50:21 +01:00 committed by Wladimir J. van der Laan
parent 06fdf326d3
commit 3022e7df2a
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GPG Key ID: 74810B012346C9A6
3 changed files with 9 additions and 3 deletions
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2
qa/pull-tester/run-bitcoind-for-test.sh.in
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@ -10,7 +10,7 @@ touch "$DATADIR/regtest/debug.log"
tail -q -n 1 -F "$DATADIR/regtest/debug.log" | grep -m 1 -q "Done loading" & tail -q -n 1 -F "$DATADIR/regtest/debug.log" | grep -m 1 -q "Done loading" &
WAITER=$! WAITER=$!
PORT=`expr 10000 + $$ % 55536` PORT=`expr 10000 + $$ % 55536`
"@abs_top_builddir@/src/bitcoind@EXEEXT@" -connect=0.0.0.0 -datadir="$DATADIR" -rpcuser=user -rpcpassword=pass -listen -keypool=3 -debug -debug=net -logtimestamps -checkmempool=0 -port=$PORT -whitelist=127.0.0.1 -regtest -rpcport=`expr $PORT + 1` & "@abs_top_builddir@/src/bitcoind@EXEEXT@" -connect=0.0.0.0 -datadir="$DATADIR" -rpcuser=user -rpcpassword=pass -listen -keypool=3 -debug -debug=net -logtimestamps -checkmempool=0 -relaypriority=0 -port=$PORT -whitelist=127.0.0.1 -regtest -rpcport=`expr $PORT + 1` &
BITCOIND=$! BITCOIND=$!
#Install a watchdog. #Install a watchdog.

1
src/init.cpp
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@ -324,6 +324,7 @@ std::string HelpMessage(HelpMessageMode mode)
if (GetBoolArg("-help-debug", false)) 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 += " -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 += " -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"; strUsage += " -minrelaytxfee=<amt> " + strprintf(_("Fees (in BTC/Kb) smaller than this are considered zero fee for relaying (default: %s)"), FormatMoney(::minRelayTxFee.GetFeePerK())) + "\n";

9
src/main.cpp
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@ -1022,7 +1022,12 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
hash.ToString(), nFees, txMinFee), hash.ToString(), nFees, txMinFee),
REJECT_INSUFFICIENTFEE, "insufficient fee"); REJECT_INSUFFICIENTFEE, "insufficient fee");
// Continuously rate-limit free (really, very-low-fee)transactions // 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 // This mitigates 'penny-flooding' -- sending thousands of free transactions just to
// be annoying or make others' transactions take longer to confirm. // be annoying or make others' transactions take longer to confirm.
if (fLimitFree && nFees < ::minRelayTxFee.GetFee(nSize)) if (fLimitFree && nFees < ::minRelayTxFee.GetFee(nSize))
@ -1041,7 +1046,7 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
// At default rate it would take over a month to fill 1GB // At default rate it would take over a month to fill 1GB
if (dFreeCount >= GetArg("-limitfreerelay", 15)*10*1000) if (dFreeCount >= GetArg("-limitfreerelay", 15)*10*1000)
return state.DoS(0, error("AcceptToMemoryPool : free transaction rejected by rate limiter"), 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); LogPrint("mempool", "Rate limit dFreeCount: %g => %g\n", dFreeCount, dFreeCount+nSize);
dFreeCount += nSize; dFreeCount += nSize;
} }