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

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ea31caf6b4 update estimatesmartfee rpc to return max of estimateSmartFee, mempoolMinFee and minRelayTxFee. (pranabp-bit)

Pull request description:

  This PR is in response to the issue [#19699](https://github.com/bitcoin/bitcoin/issues/19699).

  Based on the discussion in the comments of PR [#22673](https://github.com/bitcoin/bitcoin/pull/22673) changes have been made in the `estimatesmartfee` itself such that it takes into account `mempoolMinFee` and `relayMinFee` . Hence it provides a fee estimate that is most likely to be paid by the user in an actual transaction, preventing issues such as [#16072](https://github.com/bitcoin/bitcoin/issues/16072).

  The test file test/functional/feature_fee_estimation.py has also been updated to check this functionality.

ACKs for top commit:
  meshcollider:
    re-utACK ea31caf6b4

Tree-SHA512: 8f36153a07cbd552c5c13d11d9c6e987a7a555ea4cc83f2573c0c92dd97c706d90c30a7248671437c2f3a836d3272f8fad53d15a5fa6efaa0409ae8009b0a18d
This commit is contained in:
Samuel Dobson
2021-09-29 10:43:18 +13:00
parent d6492d4ed0 ea31caf6b4
commit b55232a337
2 changed files with 16 additions and 1 deletions
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7
src/rpc/mining.cpp
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@@ -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);
@@ -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 {