From 4f3f5cb4b142f0fcb36241fa33b52a257901dbee Mon Sep 17 00:00:00 2001
From: Glenn Willen <gwillen@nerdnet.org>
Date: Fri, 26 Oct 2018 15:24:55 -0700
Subject: [PATCH] Remove redundant txConst parameter to FillPSBT

---
 src/wallet/rpcwallet.cpp              | 22 +++++++---------------
 src/wallet/rpcwallet.h                |  2 +-
 src/wallet/test/psbt_wallet_tests.cpp |  6 +-----
 3 files changed, 9 insertions(+), 21 deletions(-)

diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 5f3fece32..e2ffb42d7 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -3735,13 +3735,13 @@ void AddKeypathToMap(const CWallet* pwallet, const CKeyID& keyID, std::map<CPubK
     hd_keypaths.emplace(vchPubKey, std::move(info));
 }
 
-bool FillPSBT(const CWallet* pwallet, PartiallySignedTransaction& psbtx, const CTransaction* txConst, int sighash_type, bool sign, bool bip32derivs)
+bool FillPSBT(const CWallet* pwallet, PartiallySignedTransaction& psbtx, int sighash_type, bool sign, bool bip32derivs)
 {
     LOCK(pwallet->cs_wallet);
     // Get all of the previous transactions
     bool complete = true;
-    for (unsigned int i = 0; i < txConst->vin.size(); ++i) {
-        const CTxIn& txin = txConst->vin[i];
+    for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
+        const CTxIn& txin = psbtx.tx->vin[i];
         PSBTInput& input = psbtx.inputs.at(i);
 
         // If we don't know about this input, skip it and let someone else deal with it
@@ -3764,8 +3764,8 @@ bool FillPSBT(const CWallet* pwallet, PartiallySignedTransaction& psbtx, const C
     }
 
     // Fill in the bip32 keypaths and redeemscripts for the outputs so that hardware wallets can identify change
-    for (unsigned int i = 0; i < txConst->vout.size(); ++i) {
-        const CTxOut& out = txConst->vout.at(i);
+    for (unsigned int i = 0; i < psbtx.tx->vout.size(); ++i) {
+        const CTxOut& out = psbtx.tx->vout.at(i);
         PSBTOutput& psbt_out = psbtx.outputs.at(i);
 
         // Fill a SignatureData with output info
@@ -3830,14 +3830,10 @@ UniValue walletprocesspsbt(const JSONRPCRequest& request)
     // Get the sighash type
     int nHashType = ParseSighashString(request.params[2]);
 
-    // Use CTransaction for the constant parts of the
-    // transaction to avoid rehashing.
-    const CTransaction txConst(*psbtx.tx);
-
     // Fill transaction with our data and also sign
     bool sign = request.params[1].isNull() ? true : request.params[1].get_bool();
     bool bip32derivs = request.params[3].isNull() ? false : request.params[3].get_bool();
-    bool complete = FillPSBT(pwallet, psbtx, &txConst, nHashType, sign, bip32derivs);
+    bool complete = FillPSBT(pwallet, psbtx, nHashType, sign, bip32derivs);
 
     UniValue result(UniValue::VOBJ);
     CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
@@ -3943,13 +3939,9 @@ UniValue walletcreatefundedpsbt(const JSONRPCRequest& request)
         psbtx.outputs.push_back(PSBTOutput());
     }
 
-    // Use CTransaction for the constant parts of the
-    // transaction to avoid rehashing.
-    const CTransaction txConst(*psbtx.tx);
-
     // Fill transaction with out data but don't sign
     bool bip32derivs = request.params[4].isNull() ? false : request.params[4].get_bool();
-    FillPSBT(pwallet, psbtx, &txConst, 1, false, bip32derivs);
+    FillPSBT(pwallet, psbtx, 1, false, bip32derivs);
 
     // Serialize the PSBT
     CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
diff --git a/src/wallet/rpcwallet.h b/src/wallet/rpcwallet.h
index 9b9a159b8..54477ef3a 100644
--- a/src/wallet/rpcwallet.h
+++ b/src/wallet/rpcwallet.h
@@ -30,5 +30,5 @@ bool EnsureWalletIsAvailable(CWallet *, bool avoidException);
 
 UniValue getaddressinfo(const JSONRPCRequest& request);
 UniValue signrawtransactionwithwallet(const JSONRPCRequest& request);
-bool FillPSBT(const CWallet* pwallet, PartiallySignedTransaction& psbtx, const CTransaction* txConst, int sighash_type = 1, bool sign = true, bool bip32derivs = false);
+bool FillPSBT(const CWallet* pwallet, PartiallySignedTransaction& psbtx, int sighash_type = 1, bool sign = true, bool bip32derivs = false);
 #endif //BITCOIN_WALLET_RPCWALLET_H
diff --git a/src/wallet/test/psbt_wallet_tests.cpp b/src/wallet/test/psbt_wallet_tests.cpp
index 34d6e1b87..b14c4f653 100644
--- a/src/wallet/test/psbt_wallet_tests.cpp
+++ b/src/wallet/test/psbt_wallet_tests.cpp
@@ -59,12 +59,8 @@ BOOST_AUTO_TEST_CASE(psbt_updater_test)
     CDataStream ssData(ParseHex("70736274ff01009a020000000258e87a21b56daf0c23be8e7070456c336f7cbaa5c8757924f545887bb2abdd750000000000ffffffff838d0427d0ec650a68aa46bb0b098aea4422c071b2ca78352a077959d07cea1d0100000000ffffffff0270aaf00800000000160014d85c2b71d0060b09c9886aeb815e50991dda124d00e1f5050000000016001400aea9a2e5f0f876a588df5546e8742d1d87008f000000000000000000"), SER_NETWORK, PROTOCOL_VERSION);
     ssData >> psbtx;
 
-    // Use CTransaction for the constant parts of the
-    // transaction to avoid rehashing.
-    const CTransaction txConst(*psbtx.tx);
-
     // Fill transaction with our data
-    FillPSBT(&m_wallet, psbtx, &txConst, 1, false, true);
+    FillPSBT(&m_wallet, psbtx, 1, false, true);
 
     // Get the final tx
     CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);