[rpc] expose blockmintxfee via getmininginfo

Author: glozow

src/rpc/mining.cpp

@@ -429,6 +429,7 @@ static RPCHelpMan getmininginfo()
                         {RPCResult::Type::STR_HEX, "target", "The current target"},
                         {RPCResult::Type::NUM, "networkhashps", "The network hashes per second"},
                         {RPCResult::Type::NUM, "pooledtx", "The size of the mempool"},
+                        {RPCResult::Type::STR_AMOUNT, "blockmintxfee", "Minimum feerate of packages selected for block inclusion in " + CURRENCY_UNIT + "/kvB"},
                         {RPCResult::Type::STR, "chain", "current network name (" LIST_CHAIN_NAMES ")"},
                         {RPCResult::Type::STR_HEX, "signet_challenge", /*optional=*/true, "The block challenge (aka. block script), in hexadecimal (only present if the current network is a signet)"},
                         {RPCResult::Type::OBJ, "next", "The next block",
@@ -469,6 +470,9 @@ static RPCHelpMan getmininginfo()
     obj.pushKV("target", GetTarget(tip, chainman.GetConsensus().powLimit).GetHex());
     obj.pushKV("networkhashps",    getnetworkhashps().HandleRequest(request));
     obj.pushKV("pooledtx",         (uint64_t)mempool.size());
+    BlockAssembler::Options assembler_options;
+    ApplyArgsManOptions(*node.args, assembler_options);
+    obj.pushKV("blockmintxfee", ValueFromAmount(assembler_options.blockMinFeeRate.GetFeePerK()));
     obj.pushKV("chain", chainman.GetParams().GetChainTypeString());
 
     UniValue next(UniValue::VOBJ);

test/functional/mining_basic.py

@@ -153,6 +153,7 @@ def test_blockmintxfee_parameter(self):
                 self.log.info(f"-> Test {blockmintxfee_parameter} ({blockmintxfee_sat_kvb} sat/kvB)...")
                 self.restart_node(0, extra_args=[blockmintxfee_parameter, '-minrelaytxfee=0', '-persistmempool=0'])
                 self.wallet.rescan_utxos()  # to avoid spending outputs of txs that are not in mempool anymore after restart
+            assert_equal(node.getmininginfo()['blockmintxfee'], blockmintxfee_btc_kvb)
 
             # submit one tx with exactly the blockmintxfee rate, and one slightly below
             tx_with_min_feerate = self.wallet.send_self_transfer(from_node=node, fee_rate=blockmintxfee_btc_kvb, confirmed_only=True)