Merge #15911: Use wallet RBF default for walletcreatefundedpsbt

d6b3640ac732f6f66a8cb6761084d1beecc8a876 [test] walletcreatefundedpsbt: check RBF is disabled when -walletrbf=0 (Sjors Provoost)
9ed062b5685eb6227d694572cb0f7bfbcc151b36 [doc] rpc: remove "fallback to" from RBF default help (Sjors Provoost)
4fcb698bc2bb74171cd3a14b94f9882d8e19e9fb [rpc] walletcreatefundedpsbt: use wallet default RBF (Sjors Provoost)

Pull request description:

  The `walletcreatefundedpsbt` RPC call currently ignores `-walletrbf` and defaults to not use RBF. This PR fixes that.

  This PR also replaces UniValue in `ConstructTransaction` with a `bool` in preparation of moving this helper method out of the RPC codebase entirely. This may be a bit overkill, but does slightly simplify it.

  Fixes #15878

ACKs for top commit:
  achow101:
    Code Review ACK d6b3640ac732f6f66a8cb6761084d1beecc8a876
  l2a5b1:
    re-ACK d6b3640
  MarcoFalke:
    ACK d6b3640ac732f6f66a8cb6761084d1beecc8a876

Tree-SHA512: 55b9bccd1ef36b54f6b34793017dc0721103099ad3761b3b04862291ee13d6915915d4dbb1a8567924fa56e5e95dfe10eec070e06701610e70c87f8ea92b2a00

5 files changed, 47 insertions, 23 deletions

diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
index 0ab504de06..d28071bcd6 100644
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -406,7 +406,11 @@ static UniValue createrawtransaction(const JSONRPCRequest& request)
         }, true
     );
 
-    CMutableTransaction rawTx = ConstructTransaction(request.params[0], request.params[1], request.params[2], request.params[3]);
+    bool rbf = false;
+    if (!request.params[3].isNull()) {
+        rbf = request.params[3].isTrue();
+    }
+    CMutableTransaction rawTx = ConstructTransaction(request.params[0], request.params[1], request.params[2], rbf);
 
     return EncodeHexTx(CTransaction(rawTx));
 }
@@ -1365,7 +1369,11 @@ UniValue createpsbt(const JSONRPCRequest& request)
         }, true
     );
 
-    CMutableTransaction rawTx = ConstructTransaction(request.params[0], request.params[1], request.params[2], request.params[3]);
+    bool rbf = false;
+    if (!request.params[3].isNull()) {
+        rbf = request.params[3].isTrue();
+    }
+    CMutableTransaction rawTx = ConstructTransaction(request.params[0], request.params[1], request.params[2], rbf);
 
     // Make a blank psbt
     PartiallySignedTransaction psbtx;
diff --git a/src/rpc/rawtransaction_util.cpp b/src/rpc/rawtransaction_util.cpp
index 1c96d01232..55425cca35 100644
--- a/src/rpc/rawtransaction_util.cpp
+++ b/src/rpc/rawtransaction_util.cpp
@@ -19,7 +19,7 @@
 #include <util/rbf.h>
 #include <util/strencodings.h>
 
-CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, const UniValue& rbf)
+CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, bool rbf)
 {
     if (inputs_in.isNull() || outputs_in.isNull())
         throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, arguments 1 and 2 must be non-null");
@@ -37,8 +37,6 @@ CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniVal
         rawTx.nLockTime = nLockTime;
     }
 
-    bool rbfOptIn = rbf.isTrue();
-
     for (unsigned int idx = 0; idx < inputs.size(); idx++) {
         const UniValue& input = inputs[idx];
         const UniValue& o = input.get_obj();
@@ -53,7 +51,7 @@ CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniVal
             throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, vout must be positive");
 
         uint32_t nSequence;
-        if (rbfOptIn) {
+        if (rbf) {
             nSequence = MAX_BIP125_RBF_SEQUENCE; /* CTxIn::SEQUENCE_FINAL - 2 */
         } else if (rawTx.nLockTime) {
             nSequence = CTxIn::SEQUENCE_FINAL - 1;
@@ -125,7 +123,7 @@ CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniVal
         }
     }
 
-    if (!rbf.isNull() && rawTx.vin.size() > 0 && rbfOptIn != SignalsOptInRBF(CTransaction(rawTx))) {
+    if (rbf && rawTx.vin.size() > 0 && !SignalsOptInRBF(CTransaction(rawTx))) {
         throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter combination: Sequence number(s) contradict replaceable option");
     }
 
diff --git a/src/rpc/rawtransaction_util.h b/src/rpc/rawtransaction_util.h
index d198887b93..c85593e71e 100644
--- a/src/rpc/rawtransaction_util.h
+++ b/src/rpc/rawtransaction_util.h
@@ -27,6 +27,6 @@ class COutPoint;
 UniValue SignTransaction(CMutableTransaction& mtx, const UniValue& prevTxs, FillableSigningProvider* keystore, std::map<COutPoint, Coin>& coins, bool tempKeystore, const UniValue& hashType);
 
 /** Create a transaction from univalue parameters */
-CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, const UniValue& rbf);
+CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, bool rbf);
 
 #endif // BITCOIN_RPC_RAWTRANSACTION_UTIL_H
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index a86e93481c..f94214b6ee 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -359,8 +359,8 @@ static UniValue sendtoaddress(const JSONRPCRequest& request)
             "                             transaction, just kept in your wallet."},
                     {"subtractfeefromamount", RPCArg::Type::BOOL, /* default */ "false", "The fee will be deducted from the amount being sent.\n"
             "                             The recipient will receive less bitcoins than you enter in the amount field."},
-                    {"replaceable", RPCArg::Type::BOOL, /* default */ "fallback to wallet's default", "Allow this transaction to be replaced by a transaction with higher fees via BIP 125"},
-                    {"conf_target", RPCArg::Type::NUM, /* default */ "fallback to wallet's default", "Confirmation target (in blocks)"},
+                    {"replaceable", RPCArg::Type::BOOL, /* default */ "wallet default", "Allow this transaction to be replaced by a transaction with higher fees via BIP 125"},
+                    {"conf_target", RPCArg::Type::NUM, /* default */ "wallet default", "Confirmation target (in blocks)"},
                     {"estimate_mode", RPCArg::Type::STR, /* default */ "UNSET", "The fee estimate mode, must be one of:\n"
             "       \"UNSET\"\n"
             "       \"ECONOMICAL\"\n"
@@ -815,8 +815,8 @@ static UniValue sendmany(const JSONRPCRequest& request)
                             {"address", RPCArg::Type::STR, RPCArg::Optional::OMITTED, "Subtract fee from this address"},
                         },
                     },
-                    {"replaceable", RPCArg::Type::BOOL, /* default */ "fallback to wallet's default", "Allow this transaction to be replaced by a transaction with higher fees via BIP 125"},
-                    {"conf_target", RPCArg::Type::NUM, /* default */ "fallback to wallet's default", "Confirmation target (in blocks)"},
+                    {"replaceable", RPCArg::Type::BOOL, /* default */ "wallet default", "Allow this transaction to be replaced by a transaction with higher fees via BIP 125"},
+                    {"conf_target", RPCArg::Type::NUM, /* default */ "wallet default", "Confirmation target (in blocks)"},
                     {"estimate_mode", RPCArg::Type::STR, /* default */ "UNSET", "The fee estimate mode, must be one of:\n"
             "       \"UNSET\"\n"
             "       \"ECONOMICAL\"\n"
@@ -3121,9 +3121,9 @@ static UniValue fundrawtransaction(const JSONRPCRequest& request)
                                     {"vout_index", RPCArg::Type::NUM, RPCArg::Optional::OMITTED, "The zero-based output index, before a change output is added."},
                                 },
                             },
-                            {"replaceable", RPCArg::Type::BOOL, /* default */ "fallback to wallet's default", "Marks this transaction as BIP125 replaceable.\n"
+                            {"replaceable", RPCArg::Type::BOOL, /* default */ "wallet default", "Marks this transaction as BIP125 replaceable.\n"
                             "                              Allows this transaction to be replaced by a transaction with higher fees"},
-                            {"conf_target", RPCArg::Type::NUM, /* default */ "fallback to wallet's default", "Confirmation target (in blocks)"},
+                            {"conf_target", RPCArg::Type::NUM, /* default */ "wallet default", "Confirmation target (in blocks)"},
                             {"estimate_mode", RPCArg::Type::STR, /* default */ "UNSET", "The fee estimate mode, must be one of:\n"
                             "         \"UNSET\"\n"
                             "         \"ECONOMICAL\"\n"
@@ -3286,7 +3286,7 @@ static UniValue bumpfee(const JSONRPCRequest& request)
                     {"txid", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The txid to be bumped"},
                     {"options", RPCArg::Type::OBJ, RPCArg::Optional::OMITTED_NAMED_ARG, "",
                         {
-                            {"confTarget", RPCArg::Type::NUM, /* default */ "fallback to wallet's default", "Confirmation target (in blocks)"},
+                            {"confTarget", RPCArg::Type::NUM, /* default */ "wallet default", "Confirmation target (in blocks)"},
                             {"totalFee", RPCArg::Type::NUM, /* default */ "fallback to 'confTarget'", "Total fee (NOT feerate) to pay, in satoshis. (DEPRECATED)\n"
             "                         In rare cases, the actual fee paid might be slightly higher than the specified\n"
             "                         totalFee if the tx change output has to be removed because it is too close to\n"
@@ -4066,7 +4066,7 @@ UniValue walletcreatefundedpsbt(const JSONRPCRequest& request)
                                     {"vout_index", RPCArg::Type::NUM, RPCArg::Optional::OMITTED, "The zero-based output index, before a change output is added."},
                                 },
                             },
-                            {"replaceable", RPCArg::Type::BOOL, /* default */ "false", "Marks this transaction as BIP125 replaceable.\n"
+                            {"replaceable", RPCArg::Type::BOOL, /* default */ "wallet default", "Marks this transaction as BIP125 replaceable.\n"
                             "                              Allows this transaction to be replaced by a transaction with higher fees"},
                             {"conf_target", RPCArg::Type::NUM, /* default */ "Fallback to wallet's confirmation target", "Confirmation target (in blocks)"},
                             {"estimate_mode", RPCArg::Type::STR, /* default */ "UNSET", "The fee estimate mode, must be one of:\n"
@@ -4101,7 +4101,13 @@ UniValue walletcreatefundedpsbt(const JSONRPCRequest& request)
 
     CAmount fee;
     int change_position;
-    CMutableTransaction rawTx = ConstructTransaction(request.params[0], request.params[1], request.params[2], request.params[3]["replaceable"]);
+    bool rbf = pwallet->m_signal_rbf;
+    const UniValue &replaceable_arg = request.params[3]["replaceable"];
+    if (!replaceable_arg.isNull()) {
+        RPCTypeCheckArgument(replaceable_arg, UniValue::VBOOL);
+        rbf = replaceable_arg.isTrue();
+    }
+    CMutableTransaction rawTx = ConstructTransaction(request.params[0], request.params[1], request.params[2], rbf);
     FundTransaction(pwallet, rawTx, fee, change_position, request.params[3]);
 
     // Make a blank psbt
diff --git a/test/functional/rpc_psbt.py b/test/functional/rpc_psbt.py
index b3d8696208..5a04e0c8d8 100755
--- a/test/functional/rpc_psbt.py
+++ b/test/functional/rpc_psbt.py
@@ -27,6 +27,11 @@ class PSBTTest(BitcoinTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = False
         self.num_nodes = 3
+        self.extra_args = [
+            ["-walletrbf=1"],
+            ["-walletrbf=0"],
+            []
+        ]
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()
@@ -207,18 +212,18 @@ class PSBTTest(BitcoinTestFramework):
         # replaceable arg
         block_height = self.nodes[0].getblockcount()
         unspent = self.nodes[0].listunspent()[0]
-        psbtx_info = self.nodes[0].walletcreatefundedpsbt([{"txid":unspent["txid"], "vout":unspent["vout"]}], [{self.nodes[2].getnewaddress():unspent["amount"]+1}], block_height+2, {"replaceable":True}, False)
+        psbtx_info = self.nodes[0].walletcreatefundedpsbt([{"txid":unspent["txid"], "vout":unspent["vout"]}], [{self.nodes[2].getnewaddress():unspent["amount"]+1}], block_height+2, {"replaceable": False}, False)
         decoded_psbt = self.nodes[0].decodepsbt(psbtx_info["psbt"])
         for tx_in, psbt_in in zip(decoded_psbt["tx"]["vin"], decoded_psbt["inputs"]):
-            assert_equal(tx_in["sequence"], MAX_BIP125_RBF_SEQUENCE)
+            assert_greater_than(tx_in["sequence"], MAX_BIP125_RBF_SEQUENCE)
             assert "bip32_derivs" not in psbt_in
         assert_equal(decoded_psbt["tx"]["locktime"], block_height+2)
 
-        # Same construction with only locktime set
-        psbtx_info = self.nodes[0].walletcreatefundedpsbt([{"txid":unspent["txid"], "vout":unspent["vout"]}], [{self.nodes[2].getnewaddress():unspent["amount"]+1}], block_height, {}, True)
+        # Same construction with only locktime set and RBF explicitly enabled
+        psbtx_info = self.nodes[0].walletcreatefundedpsbt([{"txid":unspent["txid"], "vout":unspent["vout"]}], [{self.nodes[2].getnewaddress():unspent["amount"]+1}], block_height, {"replaceable": True}, True)
         decoded_psbt = self.nodes[0].decodepsbt(psbtx_info["psbt"])
         for tx_in, psbt_in in zip(decoded_psbt["tx"]["vin"], decoded_psbt["inputs"]):
-            assert tx_in["sequence"] > MAX_BIP125_RBF_SEQUENCE
+            assert_equal(tx_in["sequence"], MAX_BIP125_RBF_SEQUENCE)
             assert "bip32_derivs" in psbt_in
         assert_equal(decoded_psbt["tx"]["locktime"], block_height)
 
@@ -226,9 +231,16 @@ class PSBTTest(BitcoinTestFramework):
         psbtx_info = self.nodes[0].walletcreatefundedpsbt([{"txid":unspent["txid"], "vout":unspent["vout"]}], [{self.nodes[2].getnewaddress():unspent["amount"]+1}])
         decoded_psbt = self.nodes[0].decodepsbt(psbtx_info["psbt"])
         for tx_in in decoded_psbt["tx"]["vin"]:
-            assert tx_in["sequence"] > MAX_BIP125_RBF_SEQUENCE
+            assert_equal(tx_in["sequence"], MAX_BIP125_RBF_SEQUENCE)
         assert_equal(decoded_psbt["tx"]["locktime"], 0)
 
+        # Same construction without optional arguments, for a node with -walletrbf=0
+        unspent1 = self.nodes[1].listunspent()[0]
+        psbtx_info = self.nodes[1].walletcreatefundedpsbt([{"txid":unspent1["txid"], "vout":unspent1["vout"]}], [{self.nodes[2].getnewaddress():unspent1["amount"]+1}], block_height)
+        decoded_psbt = self.nodes[1].decodepsbt(psbtx_info["psbt"])
+        for tx_in in decoded_psbt["tx"]["vin"]:
+            assert_greater_than(tx_in["sequence"], MAX_BIP125_RBF_SEQUENCE)
+
         # Make sure change address wallet does not have P2SH innerscript access to results in success
         # when attempting BnB coin selection
         self.nodes[0].walletcreatefundedpsbt([], [{self.nodes[2].getnewaddress():unspent["amount"]+1}], block_height+2, {"changeAddress":self.nodes[1].getnewaddress()}, False)