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No longer allow "free" transactions

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Remove -limitfreerelay and always enforce minRelayTxFee in the mempool (except from disconnected blocks)

Remove -relaypriority, the option was only used for the ability to allow free transactions to be relayed regardless of their priority.  Both notions no longer apply.
This commit is contained in:
Alex Morcos 2017-01-19 22:07:56 -05:00
parent ad727f4eaf
commit f838005444
10 changed files with 10 additions and 53 deletions
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1
qa/rpc-tests/abandonconflict.py
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@ -80,7 +80,6 @@ class AbandonConflictTest(BitcoinTestFramework):
# Restart the node with a higher min relay fee so the parent tx is no longer in mempool
# TODO: redo with eviction
# Note had to make sure tx did not have AllowFree priority
stop_node(self.nodes[0],0)
self.nodes[0]=start_node(0, self.options.tmpdir, ["-debug","-logtimemicros","-minrelaytxfee=0.0001"])

3
qa/rpc-tests/smartfees.py
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@ -188,8 +188,7 @@ class EstimateFeeTest(BitcoinTestFramework):
# Now we can connect the other nodes, didn't want to connect them earlier
# so the estimates would not be affected by the splitting transactions
# Node1 mines small blocks but that are bigger than the expected transaction rate,
# and allows free transactions.
# Node1 mines small blocks but that are bigger than the expected transaction rate.
# NOTE: the CreateNewBlock code starts counting block size at 1,000 bytes,
# (17k is room enough for 110 or so transactions)
self.nodes.append(start_node(1, self.options.tmpdir,

4
src/init.cpp
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@ -444,8 +444,6 @@ std::string HelpMessage(HelpMessageMode mode)
{
strUsage += HelpMessageOpt("-logtimemicros", strprintf("Add microsecond precision to debug timestamps (default: %u)", DEFAULT_LOGTIMEMICROS));
strUsage += HelpMessageOpt("-mocktime=<n>", "Replace actual time with <n> seconds since epoch (default: 0)");
strUsage += HelpMessageOpt("-limitfreerelay=<n>", strprintf("Continuously rate-limit free transactions to <n>*1000 bytes per minute (default: %u)", DEFAULT_LIMITFREERELAY));
strUsage += HelpMessageOpt("-relaypriority", strprintf("Require high priority for relaying free or low-fee transactions (default: %u)", DEFAULT_RELAYPRIORITY));
strUsage += HelpMessageOpt("-maxsigcachesize=<n>", strprintf("Limit size of signature cache to <n> MiB (default: %u)", DEFAULT_MAX_SIG_CACHE_SIZE));
strUsage += HelpMessageOpt("-maxtipage=<n>", strprintf("Maximum tip age in seconds to consider node in initial block download (default: %u)", DEFAULT_MAX_TIP_AGE));
}
@ -975,7 +973,7 @@ bool AppInitParameterInteraction()
if (nConnectTimeout <= 0)
nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
// Fee-per-kilobyte amount considered the same as "free"
// Fee-per-kilobyte amount required for mempool acceptance and relay
// If you are mining, be careful setting this:
// if you set it to zero then
// a transaction spammer can cheaply fill blocks using

7
src/net_processing.cpp
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@ -1853,7 +1853,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
LogPrint("mempool", " invalid orphan tx %s\n", orphanHash.ToString());
}
// Has inputs but not accepted to mempool
// Probably non-standard or insufficient fee/priority
// Probably non-standard or insufficient fee
LogPrint("mempool", " removed orphan tx %s\n", orphanHash.ToString());
vEraseQueue.push_back(orphanHash);
if (!orphanTx.HasWitness() && !stateDummy.CorruptionPossible()) {
@ -3249,9 +3249,8 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
static CFeeRate default_feerate(DEFAULT_MIN_RELAY_TX_FEE);
static FeeFilterRounder filterRounder(default_feerate);
CAmount filterToSend = filterRounder.round(currentFilter);
// If we don't allow free transactions, then we always have a fee filter of at least minRelayTxFee
if (GetArg("-limitfreerelay", DEFAULT_LIMITFREERELAY) <= 0)
filterToSend = std::max(filterToSend, ::minRelayTxFee.GetFeePerK());
// We always have a fee filter of at least minRelayTxFee
filterToSend = std::max(filterToSend, ::minRelayTxFee.GetFeePerK());
if (filterToSend != pto->lastSentFeeFilter) {
connman.PushMessage(pto, msgMaker.Make(NetMsgType::FEEFILTER, filterToSend));
pto->lastSentFeeFilter = filterToSend;

2
src/rpc/misc.cpp
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@ -61,7 +61,7 @@ UniValue getinfo(const JSONRPCRequest& request)
" \"keypoolsize\": xxxx, (numeric) how many new keys are pre-generated\n"
" \"unlocked_until\": ttt, (numeric) the timestamp in seconds since epoch (midnight Jan 1 1970 GMT) that the wallet is unlocked for transfers, or 0 if the wallet is locked\n"
" \"paytxfee\": x.xxxx, (numeric) the transaction fee set in " + CURRENCY_UNIT + "/kB\n"
" \"relayfee\": x.xxxx, (numeric) minimum relay fee for non-free transactions in " + CURRENCY_UNIT + "/kB\n"
" \"relayfee\": x.xxxx, (numeric) minimum relay fee for transactions in " + CURRENCY_UNIT + "/kB\n"
" \"errors\": \"...\" (string) any error messages\n"
"}\n"
"\nExamples:\n"

2
src/rpc/net.cpp
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@ -417,7 +417,7 @@ UniValue getnetworkinfo(const JSONRPCRequest& request)
" }\n"
" ,...\n"
" ],\n"
" \"relayfee\": x.xxxxxxxx, (numeric) minimum relay fee for non-free transactions in " + CURRENCY_UNIT + "/kB\n"
" \"relayfee\": x.xxxxxxxx, (numeric) minimum relay fee for transactions in " + CURRENCY_UNIT + "/kB\n"
" \"incrementalfee\": x.xxxxxxxx, (numeric) minimum fee increment for mempool limiting or BIP 125 replacement in " + CURRENCY_UNIT + "/kB\n"
" \"localaddresses\": [ (array) list of local addresses\n"
" {\n"

12
src/txmempool.h
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@ -30,18 +30,6 @@
class CAutoFile;
class CBlockIndex;
inline double AllowFreeThreshold()
{
return COIN * 144 / 250;
}
inline bool AllowFree(double dPriority)
{
// Large (in bytes) low-priority (new, small-coin) transactions
// need a fee.
return dPriority > AllowFreeThreshold();
}
/** Fake height value used in CCoins to signify they are only in the memory pool (since 0.8) */
static const unsigned int MEMPOOL_HEIGHT = 0x7FFFFFFF;

27
src/validation.cpp
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@ -753,32 +753,11 @@ bool AcceptToMemoryPoolWorker(CTxMemPool& pool, CValidationState& state, const C
CAmount mempoolRejectFee = pool.GetMinFee(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFee(nSize);
if (mempoolRejectFee > 0 && nModifiedFees < mempoolRejectFee) {
return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "mempool min fee not met", false, strprintf("%d < %d", nFees, mempoolRejectFee));
} else if (GetBoolArg("-relaypriority", DEFAULT_RELAYPRIORITY) && nModifiedFees < ::minRelayTxFee.GetFee(nSize) && !AllowFree(entry.GetPriority(chainActive.Height() + 1))) {
// Require that free transactions have sufficient priority to be mined in the next block.
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.
if (fLimitFree && nModifiedFees < ::minRelayTxFee.GetFee(nSize))
{
static CCriticalSection csFreeLimiter;
static double dFreeCount;
static int64_t nLastTime;
int64_t nNow = GetTime();
LOCK(csFreeLimiter);
// Use an exponentially decaying ~10-minute window:
dFreeCount *= pow(1.0 - 1.0/600.0, (double)(nNow - nLastTime));
nLastTime = nNow;
// -limitfreerelay unit is thousand-bytes-per-minute
// At default rate it would take over a month to fill 1GB
if (dFreeCount + nSize >= GetArg("-limitfreerelay", DEFAULT_LIMITFREERELAY) * 10 * 1000)
return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "rate limited free transaction");
LogPrint("mempool", "Rate limit dFreeCount: %g => %g\n", dFreeCount, dFreeCount+nSize);
dFreeCount += nSize;
// No transactions are allowed below minRelayTxFee except from disconnected blocks
if (fLimitFree && nModifiedFees < ::minRelayTxFee.GetFee(nSize)) {
return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "min relay fee not met");
}
if (nAbsurdFee && nFees > nAbsurdFee)

2
src/validation.h
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@ -122,8 +122,6 @@ static const int64_t BLOCK_DOWNLOAD_TIMEOUT_BASE = 1000000;
/** Additional block download timeout per parallel downloading peer (i.e. 5 min) */
static const int64_t BLOCK_DOWNLOAD_TIMEOUT_PER_PEER = 500000;
static const unsigned int DEFAULT_LIMITFREERELAY = 0;
static const bool DEFAULT_RELAYPRIORITY = true;
static const int64_t DEFAULT_MAX_TIP_AGE = 24 * 60 * 60;
/** Maximum age of our tip in seconds for us to be considered current for fee estimation */
static const int64_t MAX_FEE_ESTIMATION_TIP_AGE = 3 * 60 * 60;

3
src/wallet/wallet.cpp
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@ -3842,9 +3842,6 @@ bool CWallet::ParameterInteraction()
bSpendZeroConfChange = GetBoolArg("-spendzeroconfchange", DEFAULT_SPEND_ZEROCONF_CHANGE);
fWalletRbf = GetBoolArg("-walletrbf", DEFAULT_WALLET_RBF);
if (GetBoolArg("-sendfreetransactions", false))
InitWarning("The argument -sendfreetransactions is no longer supported.");
return true;
}