[rpc]: update sendall RPC to return the resulting tx weight

src/wallet/rpc/spend.cpp

@@ -1369,6 +1369,7 @@ RPCHelpMan sendall()
             RPCResult::Type::OBJ, "", "",
                 {
                     {RPCResult::Type::BOOL, "complete", "If the transaction has a complete set of signatures"},
+                    {RPCResult::Type::NUM, "weight", "The resulting transaction weight in weight units"},
                     {RPCResult::Type::STR_HEX, "txid", /*optional=*/true, "The transaction id for the send. Only 1 transaction is created regardless of the number of addresses."},
                     {RPCResult::Type::STR_HEX, "hex", /*optional=*/true, "If add_to_wallet is false, the hex-encoded raw transaction with signature(s)"},
                     {RPCResult::Type::STR, "psbt", /*optional=*/true, "If more signatures are needed, or if add_to_wallet is false, the base64-encoded (partially) signed transaction"}
@@ -1564,8 +1565,9 @@ RPCHelpMan sendall()
                     pwallet->LockCoin(txin.prevout);
                 }
             }
-
-            return FinishTransaction(pwallet, options, rawTx);
+            auto result = FinishTransaction(pwallet, options, rawTx);
+            result.pushKV("weight", tx_size.weight);
+            return result;
         }
     };
 }

test/functional/wallet_sendall.py

@@ -68,6 +68,7 @@ def test_sendall_success(self, sendall_args, remaining_balance = 0):
         assert_equal(remaining_balance, self.wallet.getbalances()["mine"]["trusted"])
 
         assert_equal(sendall_tx_receipt["complete"], True)
+        assert_greater_than(sendall_tx_receipt["weight"], 0)
         return self.wallet.gettransaction(txid = sendall_tx_receipt["txid"], verbose = True)
 
     @cleanup