Merge #20426: wallet: allow zero-fee fundrawtransaction/walletcreatefundedpsbt and other fixes

9f08780dd7946b63476e9736745131db8e7f4e93 Use the correct incremental fee constant in bumpfee help (Jon Atack)
3f1e10b2b1cd11f7112fbad6355464bd4adbbc5c Update feeRate (BTC/kvB) to fee_rate (sat/vB) in wallet_bumpfee (Jon Atack)
1b3d7009280595108eb22ac1188bc4367804fc5d Allow zero-fee fundrawtxn and walletcreatefundedpsbt calls (Jon Atack)

Pull request description:

  - Fixes https://github.com/bitcoin/bitcoin/pull/20305/files#r525406176. A check to raise an error on zero-fee txns was mistakenly extended in a0d4957 from the bumpfee and send{toaddress, many} RPCs to also include fundrawtransaction and walletcreatefundedpsbt. This commit re-overrides zero fee rate checking for these two RPCs, not only for the feeRate (BTC/kvB) arg to return to previous behavior, but also for the new fee_rate (sat/vB) arg. Negative fee rates will still raise "amount out of range" by the MoneyRange check in src/bitcoin-tx.cpp::AmountFromValue.

  - Updates a wallet bumpfee test from feeRate (BTC/kvB) to fee_rate (sat/vB)

  - Fixes https://github.com/bitcoin/bitcoin/pull/20305/files#r525405363 to use the correct incremental fee rate constant in the bumpfee help  (thanks Marco Falke for the catch) and rectifies "1.000 sat/vB sat/vB" in the help to "1.000 sat/vB"

ACKs for top commit:
  MarcoFalke:
    review ACK 9f08780dd7946b63476e9736745131db8e7f4e93  🐾
  promag:
    Code review ACK 9f08780dd7946b63476e9736745131db8e7f4e93.
  Xekyo:
    Code review reACK 9f08780dd7946b63476e9736745131db8e7f4e93.

Tree-SHA512: 413dfb4f23ebaf3d2ef210dd04610a843272e64eabba428699f5de4d646a86ac4911dab66b5e2f5ebea53b76e4be8347ef40824c1592c750d5eaa12579d3cdf6

5 files changed, 32 insertions, 36 deletions

diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 6efa3d0c27..dd75e876bc 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -29,7 +29,6 @@
 #include <util/translation.h>
 #include <util/url.h>
 #include <util/vector.h>
-#include <validation.h>
 #include <wallet/coincontrol.h>
 #include <wallet/context.h>
 #include <wallet/feebumper.h>
@@ -219,14 +218,8 @@ static void SetFeeEstimateMode(const CWallet* pwallet, CCoinControl& cc, const U
         if (!estimate_mode.isNull() && !estimate_mode.get_str().empty()) {
             throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot specify both estimate_mode and fee_rate");
         }
-        CFeeRate fee_rate_in_sat_vb{CFeeRate(AmountFromValue(fee_rate), COIN)};
-        if (override_min_fee) {
-            if (fee_rate_in_sat_vb <= CFeeRate(0)) {
-                throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Invalid fee_rate %s (must be greater than 0)", fee_rate_in_sat_vb.ToString(FeeEstimateMode::SAT_VB)));
-            }
-            cc.fOverrideFeeRate = true;
-        }
-        cc.m_feerate = fee_rate_in_sat_vb;
+        cc.m_feerate = CFeeRate(AmountFromValue(fee_rate), COIN);
+        if (override_min_fee) cc.fOverrideFeeRate = true;
         // Default RBF to true for explicit fee_rate, if unset.
         if (cc.m_signal_bip125_rbf == nullopt) cc.m_signal_bip125_rbf = true;
         return;
@@ -3150,11 +3143,7 @@ void FundTransaction(CWallet* const pwallet, CMutableTransaction& tx, CAmount& f
             if (options.exists("estimate_mode")) {
                 throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot specify both estimate_mode and feeRate");
             }
-            CFeeRate fee_rate(AmountFromValue(options["feeRate"]));
-            if (fee_rate <= CFeeRate(0)) {
-                throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Invalid feeRate %s (must be greater than 0)", fee_rate.ToString(FeeEstimateMode::BTC_KVB)));
-            }
-            coinControl.m_feerate = fee_rate;
+            coinControl.m_feerate = CFeeRate(AmountFromValue(options["feeRate"]));
             coinControl.fOverrideFeeRate = true;
         }
 
@@ -3393,7 +3382,7 @@ RPCHelpMan signrawtransactionwithwallet()
 static RPCHelpMan bumpfee_helper(std::string method_name)
 {
     bool want_psbt = method_name == "psbtbumpfee";
-    const std::string incremental_fee{CFeeRate(DEFAULT_MIN_RELAY_TX_FEE).ToString(FeeEstimateMode::SAT_VB)};
+    const std::string incremental_fee{CFeeRate(DEFAULT_INCREMENTAL_RELAY_FEE).ToString(FeeEstimateMode::SAT_VB)};
 
     return RPCHelpMan{method_name,
         "\nBumps the fee of an opt-in-RBF transaction T, replacing it with a new transaction B.\n"
@@ -3416,7 +3405,7 @@ static RPCHelpMan bumpfee_helper(std::string method_name)
                     {"conf_target", RPCArg::Type::NUM, /* default */ "wallet -txconfirmtarget", "Confirmation target in blocks\n"},
                     {"fee_rate", RPCArg::Type::AMOUNT, /* default */ "not set, fall back to wallet fee estimation",
                              "\nSpecify a fee rate in " + CURRENCY_ATOM + "/vB instead of relying on the built-in fee estimator.\n"
-                             "Must be at least " + incremental_fee + " " + CURRENCY_ATOM + "/vB higher than the current transaction fee rate.\n"
+                             "Must be at least " + incremental_fee + " higher than the current transaction fee rate.\n"
                              "WARNING: before version 0.21, fee_rate was in " + CURRENCY_UNIT + "/kvB. As of 0.21, fee_rate is in " + CURRENCY_ATOM + "/vB.\n"},
                     {"replaceable", RPCArg::Type::BOOL, /* default */ "true", "Whether the new transaction should still be\n"
                              "marked bip-125 replaceable. If true, the sequence numbers in the transaction will\n"
diff --git a/test/functional/rpc_fundrawtransaction.py b/test/functional/rpc_fundrawtransaction.py
index f987867e61..8ee0ecab0a 100755
--- a/test/functional/rpc_fundrawtransaction.py
+++ b/test/functional/rpc_fundrawtransaction.py
@@ -721,11 +721,17 @@ class RawTransactionsTest(BitcoinTestFramework):
         result2 = node.fundrawtransaction(rawtx, {"feeRate": 2 * self.min_relay_tx_fee})
         result3 = node.fundrawtransaction(rawtx, {"fee_rate": 10 * btc_kvb_to_sat_vb * self.min_relay_tx_fee})
         result4 = node.fundrawtransaction(rawtx, {"feeRate": 10 * self.min_relay_tx_fee})
+        # Test that funding non-standard "zero-fee" transactions is valid.
+        result5 = self.nodes[3].fundrawtransaction(rawtx, {"fee_rate": 0})
+        result6 = self.nodes[3].fundrawtransaction(rawtx, {"feeRate": 0})
+
         result_fee_rate = result['fee'] * 1000 / count_bytes(result['hex'])
         assert_fee_amount(result1['fee'], count_bytes(result2['hex']), 2 * result_fee_rate)
         assert_fee_amount(result2['fee'], count_bytes(result2['hex']), 2 * result_fee_rate)
         assert_fee_amount(result3['fee'], count_bytes(result3['hex']), 10 * result_fee_rate)
         assert_fee_amount(result4['fee'], count_bytes(result3['hex']), 10 * result_fee_rate)
+        assert_fee_amount(result5['fee'], count_bytes(result5['hex']), 0)
+        assert_fee_amount(result6['fee'], count_bytes(result6['hex']), 0)
 
         # With no arguments passed, expect fee of 141 satoshis.
         assert_approx(node.fundrawtransaction(rawtx)["fee"], vexp=0.00000141, vspan=0.00000001)
@@ -752,19 +758,15 @@ class RawTransactionsTest(BitcoinTestFramework):
                     node.fundrawtransaction, rawtx, {"estimate_mode": mode, "conf_target": n, "add_inputs": True})
 
         self.log.info("Test invalid fee rate settings")
-        assert_raises_rpc_error(-8, "Invalid fee_rate 0.000 sat/vB (must be greater than 0)",
-            node.fundrawtransaction, rawtx, {"fee_rate": 0, "add_inputs": True})
-        assert_raises_rpc_error(-8, "Invalid feeRate 0.00000000 BTC/kvB (must be greater than 0)",
-            node.fundrawtransaction, rawtx, {"feeRate": 0, "add_inputs": True})
         for param, value in {("fee_rate", 100000), ("feeRate", 1.000)}:
             assert_raises_rpc_error(-4, "Fee exceeds maximum configured by user (e.g. -maxtxfee, maxfeerate)",
                 node.fundrawtransaction, rawtx, {param: value, "add_inputs": True})
             assert_raises_rpc_error(-3, "Amount out of range",
-                node.fundrawtransaction, rawtx, {"fee_rate": -1, "add_inputs": True})
+                node.fundrawtransaction, rawtx, {param: -1, "add_inputs": True})
             assert_raises_rpc_error(-3, "Amount is not a number or string",
-                node.fundrawtransaction, rawtx, {"fee_rate": {"foo": "bar"}, "add_inputs": True})
+                node.fundrawtransaction, rawtx, {param: {"foo": "bar"}, "add_inputs": True})
             assert_raises_rpc_error(-3, "Invalid amount",
-                node.fundrawtransaction, rawtx, {"fee_rate": "", "add_inputs": True})
+                node.fundrawtransaction, rawtx, {param: "", "add_inputs": True})
 
         self.log.info("Test min fee rate checks are bypassed with fundrawtxn, e.g. a fee_rate under 1 sat/vB is allowed")
         node.fundrawtransaction(rawtx, {"fee_rate": 0.99999999, "add_inputs": True})
diff --git a/test/functional/rpc_psbt.py b/test/functional/rpc_psbt.py
index 498197b5e5..5840801b00 100755
--- a/test/functional/rpc_psbt.py
+++ b/test/functional/rpc_psbt.py
@@ -192,26 +192,27 @@ class PSBTTest(BitcoinTestFramework):
         assert_approx(res1["fee"], 0.055, 0.005)
         res2 = self.nodes[1].walletcreatefundedpsbt(inputs, outputs, 0, {"feeRate": 0.1, "add_inputs": True})
         assert_approx(res2["fee"], 0.055, 0.005)
+
         self.log.info("Test min fee rate checks with walletcreatefundedpsbt are bypassed, e.g. a fee_rate under 1 sat/vB is allowed")
         res3 = self.nodes[1].walletcreatefundedpsbt(inputs, outputs, 0, {"fee_rate": 0.99999999, "add_inputs": True})
         assert_approx(res3["fee"], 0.00000381, 0.0000001)
         res4 = self.nodes[1].walletcreatefundedpsbt(inputs, outputs, 0, {"feeRate": 0.00000999, "add_inputs": True})
         assert_approx(res4["fee"], 0.00000381, 0.0000001)
 
+        self.log.info("Test min fee rate checks with walletcreatefundedpsbt are bypassed and that funding non-standard 'zero-fee' transactions is valid")
+        for param in ["fee_rate", "feeRate"]:
+            assert_equal(self.nodes[1].walletcreatefundedpsbt(inputs, outputs, 0, {param: 0, "add_inputs": True})["fee"], 0)
+
         self.log.info("Test invalid fee rate settings")
-        assert_raises_rpc_error(-8, "Invalid fee_rate 0.000 sat/vB (must be greater than 0)",
-            self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {"fee_rate": 0, "add_inputs": True})
-        assert_raises_rpc_error(-8, "Invalid feeRate 0.00000000 BTC/kvB (must be greater than 0)",
-            self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {"feeRate": 0, "add_inputs": True})
         for param, value in {("fee_rate", 100000), ("feeRate", 1)}:
             assert_raises_rpc_error(-4, "Fee exceeds maximum configured by user (e.g. -maxtxfee, maxfeerate)",
                 self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {param: value, "add_inputs": True})
             assert_raises_rpc_error(-3, "Amount out of range",
-                self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {"fee_rate": -1, "add_inputs": True})
+                self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {param: -1, "add_inputs": True})
             assert_raises_rpc_error(-3, "Amount is not a number or string",
-                self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {"fee_rate": {"foo": "bar"}, "add_inputs": True})
+                self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {param: {"foo": "bar"}, "add_inputs": True})
             assert_raises_rpc_error(-3, "Invalid amount",
-                self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {"fee_rate": "", "add_inputs": True})
+                self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {param: "", "add_inputs": True})
 
         self.log.info("- raises RPC error if both feeRate and fee_rate are passed")
         assert_raises_rpc_error(-8, "Cannot specify both fee_rate (sat/vB) and feeRate (BTC/kvB)",
diff --git a/test/functional/wallet_bumpfee.py b/test/functional/wallet_bumpfee.py
index c323aac3cc..99c9737258 100755
--- a/test/functional/wallet_bumpfee.py
+++ b/test/functional/wallet_bumpfee.py
@@ -107,12 +107,10 @@ class BumpFeeTest(BitcoinTestFramework):
             assert_raises_rpc_error(-3, "Unexpected key {}".format(key), rbf_node.bumpfee, rbfid, {key: NORMAL})
 
         # Bumping to just above minrelay should fail to increase the total fee enough.
-        assert_raises_rpc_error(-8, "Insufficient total fee 0.00000141, must be at least 0.00001704 (oldFee 0.00000999 + incrementalFee 0.00000705)",
-            rbf_node.bumpfee, rbfid, {"fee_rate": INSUFFICIENT})
+        assert_raises_rpc_error(-8, "Insufficient total fee 0.00000141", rbf_node.bumpfee, rbfid, {"fee_rate": INSUFFICIENT})
 
         self.log.info("Test invalid fee rate settings")
-        assert_raises_rpc_error(-8, "Insufficient total fee 0.00, must be at least 0.00001704 (oldFee 0.00000999 + incrementalFee 0.00000705)",
-            rbf_node.bumpfee, rbfid, {"fee_rate": 0})
+        assert_raises_rpc_error(-8, "Insufficient total fee 0.00", rbf_node.bumpfee, rbfid, {"fee_rate": 0})
         assert_raises_rpc_error(-4, "Specified or calculated fee 0.141 is too high (cannot be higher than -maxtxfee 0.10",
             rbf_node.bumpfee, rbfid, {"fee_rate": TOO_HIGH})
         assert_raises_rpc_error(-3, "Amount out of range", rbf_node.bumpfee, rbfid, {"fee_rate": -1})
@@ -421,7 +419,7 @@ def test_watchonly_psbt(self, peer_node, rbf_node, dest_address):
     self.sync_all()
 
     # Create single-input PSBT for transaction to be bumped
-    psbt = watcher.walletcreatefundedpsbt([], {dest_address: 0.0005}, 0, {"feeRate": 0.00001}, True)['psbt']
+    psbt = watcher.walletcreatefundedpsbt([], {dest_address: 0.0005}, 0, {"fee_rate": 1}, True)['psbt']
     psbt_signed = signer.walletprocesspsbt(psbt=psbt, sign=True, sighashtype="ALL", bip32derivs=True)
     psbt_final = watcher.finalizepsbt(psbt_signed["psbt"])
     original_txid = watcher.sendrawtransaction(psbt_final["hex"])
diff --git a/test/functional/wallet_send.py b/test/functional/wallet_send.py
index 5da71c85f9..685e805877 100755
--- a/test/functional/wallet_send.py
+++ b/test/functional/wallet_send.py
@@ -303,10 +303,16 @@ class WalletSendTest(BitcoinTestFramework):
                 self.test_send(from_wallet=w0, to_wallet=w1, amount=1, conf_target=v, estimate_mode=mode,
                     expect_error=(-3, "Expected type number for conf_target, got {}".format(k)))
 
-        # Test setting explicit fee rate just below the minimum.
+        # Test setting explicit fee rate just below the minimum and at zero.
         self.log.info("Explicit fee rate raises RPC error 'fee rate too low' if fee_rate of 0.99999999 is passed")
         self.test_send(from_wallet=w0, to_wallet=w1, amount=1, fee_rate=0.99999999,
             expect_error=(-4, "Fee rate (0.999 sat/vB) is lower than the minimum fee rate setting (1.000 sat/vB)"))
+        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate=0.99999999,
+            expect_error=(-4, "Fee rate (0.999 sat/vB) is lower than the minimum fee rate setting (1.000 sat/vB)"))
+        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, fee_rate=0,
+            expect_error=(-4, "Fee rate (0.000 sat/vB) is lower than the minimum fee rate setting (1.000 sat/vB)"))
+        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate=0,
+            expect_error=(-4, "Fee rate (0.000 sat/vB) is lower than the minimum fee rate setting (1.000 sat/vB)"))
 
         # TODO: Return hex if fee rate is below -maxmempool
         # res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, conf_target=0.1, estimate_mode="sat/b", add_to_wallet=False)