Have CalculateMaximumSignedTxSize also compute tx weight

src/wallet/feebumper.cpp

@@ -190,7 +190,7 @@ Result CreateRateBumpTransaction(CWallet& wallet, const uint256& txid, const CCo
     if (coin_control.m_feerate) {
         // The user provided a feeRate argument.
         // We calculate this here to avoid compiler warning on the cs_wallet lock
-        const int64_t maxTxSize = CalculateMaximumSignedTxSize(*wtx.tx, &wallet);
+        const int64_t maxTxSize = CalculateMaximumSignedTxSize(*wtx.tx, &wallet).first;
         Result res = CheckFeeRate(wallet, wtx, *new_coin_control.m_feerate, maxTxSize, errors);
         if (res != Result::OK) {
             return res;

src/wallet/wallet.cpp

@@ -1594,14 +1594,15 @@ bool CWallet::ImportScriptPubKeys(const std::string& label, const std::set<CScri
     return true;
 }
 
-int64_t CalculateMaximumSignedTxSize(const CTransaction &tx, const CWallet *wallet, bool use_max_sig)
+// Returns pair of vsize and weight
+std::pair<int64_t, int64_t> CalculateMaximumSignedTxSize(const CTransaction &tx, const CWallet *wallet, bool use_max_sig)
 {
     std::vector<CTxOut> txouts;
     for (const CTxIn& input : tx.vin) {
         const auto mi = wallet->mapWallet.find(input.prevout.hash);
         // Can not estimate size without knowing the input details
         if (mi == wallet->mapWallet.end()) {
-            return -1;
+            return std::make_pair(-1, -1);
         }
         assert(input.prevout.n < mi->second.tx->vout.size());
         txouts.emplace_back(mi->second.tx->vout[input.prevout.n]);
@@ -1610,13 +1611,16 @@ int64_t CalculateMaximumSignedTxSize(const CTransaction &tx, const CWallet *wall
 }
 
 // txouts needs to be in the order of tx.vin
-int64_t CalculateMaximumSignedTxSize(const CTransaction &tx, const CWallet *wallet, const std::vector<CTxOut>& txouts, bool use_max_sig)
+std::pair<int64_t, int64_t> CalculateMaximumSignedTxSize(const CTransaction &tx, const CWallet *wallet, const std::vector<CTxOut>& txouts, bool use_max_sig)
 {
     CMutableTransaction txNew(tx);
     if (!wallet->DummySignTx(txNew, txouts, use_max_sig)) {
-        return -1;
+        return std::make_pair(-1, -1);
     }
-    return GetVirtualTransactionSize(CTransaction(txNew));
+    CTransaction ctx(txNew);
+    int64_t vsize = GetVirtualTransactionSize(ctx);
+    int64_t weight = GetTransactionWeight(ctx);
+    return std::make_pair(vsize, weight);
 }
 
 int CalculateMaximumSignedInputSize(const CTxOut& txout, const CWallet* wallet, bool use_max_sig)
@@ -2770,6 +2774,7 @@ bool CWallet::CreateTransactionInternal(
     CMutableTransaction txNew;
     FeeCalculation feeCalc;
     CAmount nFeeNeeded;
+    std::pair<int64_t, int64_t> tx_sizes;
     int nBytes;
     {
         std::set<CInputCoin> setCoins;
@@ -2952,7 +2957,8 @@ bool CWallet::CreateTransactionInternal(
                     txNew.vin.push_back(CTxIn(coin.outpoint,CScript()));
                 }
 
-                nBytes = CalculateMaximumSignedTxSize(CTransaction(txNew), this, coin_control.fAllowWatchOnly);
+                tx_sizes = CalculateMaximumSignedTxSize(CTransaction(txNew), this, coin_control.fAllowWatchOnly);
+                nBytes = tx_sizes.first;
                 if (nBytes < 0) {
                     error = _("Signing transaction failed");
                     return false;

src/wallet/wallet.h

@@ -1321,8 +1321,8 @@ public:
 // Use DummySignatureCreator, which inserts 71 byte signatures everywhere.
 // NOTE: this requires that all inputs must be in mapWallet (eg the tx should
 // be IsAllFromMe).
-int64_t CalculateMaximumSignedTxSize(const CTransaction &tx, const CWallet *wallet, bool use_max_sig = false) EXCLUSIVE_LOCKS_REQUIRED(wallet->cs_wallet);
-int64_t CalculateMaximumSignedTxSize(const CTransaction &tx, const CWallet *wallet, const std::vector<CTxOut>& txouts, bool use_max_sig = false);
+std::pair<int64_t, int64_t> CalculateMaximumSignedTxSize(const CTransaction &tx, const CWallet *wallet, bool use_max_sig = false) EXCLUSIVE_LOCKS_REQUIRED(wallet->cs_wallet);
+std::pair<int64_t, int64_t> CalculateMaximumSignedTxSize(const CTransaction &tx, const CWallet *wallet, const std::vector<CTxOut>& txouts, bool use_max_sig = false);
 
 //! Add wallet name to persistent configuration so it will be loaded on startup.
 bool AddWalletSetting(interfaces::Chain& chain, const std::string& wallet_name);