fix: optimize create transaction

src/ZcashHaskell/Utils.hs

@@ -132,40 +132,20 @@ createTransaction ::
   -> ZcashNet -- ^ the network to be used
   -> Int -- ^ target block height
   -> Bool -- ^ True to build, False to estimate fee
-  -> Either TxError HexString
+  -> HexString
 createTransaction sapAnchor orchAnchor tSpend sSpend oSpend outgoing znet bh build =
-  processResult $! txResult
+  withPureBorshVarBuffer $
-  where
+  rustWrapperCreateTx
-    processResult :: HexString -> Either TxError HexString
+    (case sapAnchor of
-    processResult input
+       Nothing -> "0"
-      | BS.length (hexBytes input) > 1 = Right input
+       Just sA -> toBytes $ sapTree sA)
-      | otherwise =
+    (case orchAnchor of
-        case head (BS.unpack $ hexBytes input) of
+       Nothing -> "0"
-          0 -> Left InsufficientFunds
+       Just oA -> toBytes $ orchTree oA)
-          1 -> Left ChangeRequired
+    tSpend
-          2 -> Left Fee
+    sSpend
-          3 -> Left Balance
+    oSpend
-          4 -> Left TransparentBuild
+    outgoing
-          5 -> Left SaplingBuild
+    (znet == MainNet)
-          6 -> Left OrchardBuild
+    (fromIntegral bh)
-          7 -> Left OrchardSpend
+    build
-          8 -> Left OrchardRecipient
-          9 -> Left SaplingBuilderNotAvailable
-          10 -> Left OrchardBuilderNotAvailable
-          _ -> Left ZHError
-    txResult =
-      withPureBorshVarBuffer $
-      rustWrapperCreateTx
-        (case sapAnchor of
-           Nothing -> "0"
-           Just sA -> toBytes $ sapTree sA)
-        (case orchAnchor of
-           Nothing -> "0"
-           Just oA -> toBytes $ orchTree oA)
-        tSpend
-        sSpend
-        oSpend
-        outgoing
-        (znet == MainNet)
-        (fromIntegral bh)
-        build