fix: optimize FFI for large results

src/ZcashHaskell/Utils.hs

@@ -132,20 +132,36 @@ createTransaction ::
   -> ZcashNet -- ^ the network to be used
   -> Int -- ^ target block height
   -> Bool -- ^ True to build, False to estimate fee
-  -> HexString
+  -> IO (Either TxError HexString)
-createTransaction sapAnchor orchAnchor tSpend sSpend oSpend outgoing znet bh build =
+createTransaction sapAnchor orchAnchor tSpend sSpend oSpend outgoing znet bh build = do
-  withPureBorshVarBuffer $
+  txResult <-
-  rustWrapperCreateTx
+    withBorshBufferOfInitSize 5120 $
-    (case sapAnchor of
+    rustWrapperCreateTx
-       Nothing -> "0"
+      (case sapAnchor of
-       Just sA -> toBytes $ sapTree sA)
+         Nothing -> "0"
-    (case orchAnchor of
+         Just sA -> toBytes $ sapTree sA)
-       Nothing -> "0"
+      (case orchAnchor of
-       Just oA -> toBytes $ orchTree oA)
+         Nothing -> "0"
-    tSpend
+         Just oA -> toBytes $ orchTree oA)
-    sSpend
+      tSpend
-    oSpend
+      sSpend
-    outgoing
+      oSpend
-    (znet == MainNet)
+      outgoing
-    (fromIntegral bh)
+      (znet == MainNet)
-    build
+      (fromIntegral bh)
+      build
+  if BS.length (hexBytes txResult) > 1
+    then pure $ Right txResult
+    else case head (BS.unpack $ hexBytes txResult) of
+           0 -> pure $ Left InsufficientFunds
+           1 -> pure $ Left ChangeRequired
+           2 -> pure $ Left Fee
+           3 -> pure $ Left Balance
+           4 -> pure $ Left TransparentBuild
+           5 -> pure $ Left SaplingBuild
+           6 -> pure $ Left OrchardBuild
+           7 -> pure $ Left OrchardSpend
+           8 -> pure $ Left OrchardRecipient
+           9 -> pure $ Left SaplingBuilderNotAvailable
+           10 -> pure $ Left OrchardBuilderNotAvailable
+           _ -> pure $ Left ZHError