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rpc: update estimatesmartfee to return max of CBlockPolicyEstimator::estimateSmartFee, mempoolMinFee and minRelayTxFee #22722

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Sep 28, 2021
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rpc: update estimatesmartfee to return max of CBlockPolicyEstimator::estimateSmartFee, mempoolMinFee and minRelayTxFee #22722

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7 changes: 6 additions & 1 deletion src/rpc/mining.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1103,6 +1103,8 @@ static RPCHelpMan estimatesmartfee()
RPCTypeCheckArgument(request.params[0], UniValue::VNUM);

CBlockPolicyEstimator& fee_estimator = EnsureAnyFeeEstimator(request.context);
const NodeContext& node = EnsureAnyNodeContext(request.context);
const CTxMemPool& mempool = EnsureMemPool(node);

unsigned int max_target = fee_estimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
unsigned int conf_target = ParseConfirmTarget(request.params[0], max_target);
Expand All @@ -1118,7 +1120,10 @@ static RPCHelpMan estimatesmartfee()
UniValue result(UniValue::VOBJ);
UniValue errors(UniValue::VARR);
FeeCalculation feeCalc;
CFeeRate feeRate = fee_estimator.estimateSmartFee(conf_target, &feeCalc, conservative);
CFeeRate feeRate{fee_estimator.estimateSmartFee(conf_target, &feeCalc, conservative)};
CFeeRate min_mempool_feerate{mempool.GetMinFee(gArgs.GetIntArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000)};
CFeeRate min_relay_feerate{::minRelayTxFee};
feeRate = std::max({feeRate, min_mempool_feerate, min_relay_feerate});
if (feeRate != CFeeRate(0)) {
result.pushKV("feerate", ValueFromAmount(feeRate.GetFeePerK()));
} else {
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10 changes: 10 additions & 0 deletions test/functional/feature_fee_estimation.py
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Expand Up @@ -132,9 +132,13 @@ def check_smart_estimates(node, fees_seen):
delta = 1.0e-6 # account for rounding error
last_feerate = float(max(fees_seen))
all_smart_estimates = [node.estimatesmartfee(i) for i in range(1, 26)]
mempoolMinFee = node.getmempoolinfo()['mempoolminfee']
minRelaytxFee = node.getmempoolinfo()['minrelaytxfee']
for i, e in enumerate(all_smart_estimates): # estimate is for i+1
feerate = float(e["feerate"])
assert_greater_than(feerate, 0)
assert_greater_than_or_equal(feerate, float(mempoolMinFee))
assert_greater_than_or_equal(feerate, float(minRelaytxFee))

if feerate + delta < min(fees_seen) or feerate - delta > max(fees_seen):
raise AssertionError(f"Estimated fee ({feerate}) out of range ({min(fees_seen)},{max(fees_seen)})")
Expand Down Expand Up @@ -275,6 +279,12 @@ def run_test(self):
self.log.info("Final estimates after emptying mempools")
check_estimates(self.nodes[1], self.fees_per_kb)

# check that the effective feerate is greater than or equal to the mempoolminfee even for high mempoolminfee
self.log.info("Test fee rate estimation after restarting node with high MempoolMinFee")
high_val = 3*self.nodes[1].estimatesmartfee(1)['feerate']
self.restart_node(1, extra_args=[f'-minrelaytxfee={high_val}'])
check_estimates(self.nodes[1], self.fees_per_kb)

self.log.info("Testing that fee estimation is disabled in blocksonly.")
self.restart_node(0, ["-blocksonly"])
assert_raises_rpc_error(-32603, "Fee estimation disabled",
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