Add TxBuilder APIs

bdk-ffi/src/bdk.udl

@@ -712,6 +712,8 @@ interface TxBuilder {
 
   TxBuilder add_data(sequence<u8> data);
 
+  TxBuilder current_height(u32 height);
+
   [Throws=CreateTxError]
   Psbt finish([ByRef] Wallet wallet);
 };
@@ -721,6 +723,8 @@ interface BumpFeeTxBuilder {
 
   BumpFeeTxBuilder set_exact_sequence(u32 nsequence);
 
+  BumpFeeTxBuilder current_height(u32 height);
+
   [Throws=CreateTxError]
   Psbt finish([ByRef] Wallet wallet);
 };

bdk-ffi/src/tx_builder.rs

@@ -3,18 +3,18 @@ use crate::error::CreateTxError;
 use crate::types::ScriptAmount;
 use crate::wallet::Wallet;
 
-use bdk_wallet::KeychainKind;
 use bitcoin_ffi::{Amount, FeeRate, Script};
 
 use bdk_wallet::bitcoin::amount::Amount as BdkAmount;
+use bdk_wallet::bitcoin::script::PushBytesBuf;
 use bdk_wallet::bitcoin::Psbt as BdkPsbt;
 use bdk_wallet::bitcoin::ScriptBuf as BdkScriptBuf;
 use bdk_wallet::bitcoin::{OutPoint, Sequence, Txid};
 use bdk_wallet::ChangeSpendPolicy;
+use bdk_wallet::KeychainKind;
 
 use std::collections::BTreeMap;
 use std::collections::HashMap;
-use bdk_wallet::bitcoin::script::PushBytesBuf;
 use std::collections::HashSet;
 use std::convert::TryFrom;
 use std::str::FromStr;
@@ -36,6 +36,7 @@ pub struct TxBuilder {
     pub(crate) drain_to: Option<BdkScriptBuf>,
     pub(crate) sequence: Option<u32>,
     pub(crate) data: Vec<u8>,
+    pub(crate) current_height: Option<u32>,
 }
 
 impl TxBuilder {
@@ -55,6 +56,7 @@ impl TxBuilder {
             drain_to: None,
             sequence: None,
             data: Vec::new(),
+            current_height: None,
         }
     }
 
@@ -204,6 +206,13 @@ impl TxBuilder {
         })
     }
 
+    pub(crate) fn current_height(&self, height: u32) -> Arc<Self> {
+        Arc::new(TxBuilder {
+            current_height: Some(height),
+            ..self.clone()
+        })
+    }
+
     pub(crate) fn finish(&self, wallet: &Arc<Wallet>) -> Result<Arc<Psbt>, CreateTxError> {
         // TODO: I had to change the wallet here to be mutable. Why is that now required with the 1.0 API?
         let mut wallet = wallet.get_wallet();
@@ -252,6 +261,9 @@ impl TxBuilder {
             let push_bytes = PushBytesBuf::try_from(self.data.clone())?;
             tx_builder.add_data(&push_bytes);
         }
+        if let Some(height) = self.current_height {
+            tx_builder.current_height(height);
+        }
 
         let psbt = tx_builder.finish().map_err(CreateTxError::from)?;
 
@@ -264,6 +276,7 @@ pub(crate) struct BumpFeeTxBuilder {
     pub(crate) txid: String,
     pub(crate) fee_rate: Arc<FeeRate>,
     pub(crate) sequence: Option<u32>,
+    pub(crate) current_height: Option<u32>,
 }
 
 impl BumpFeeTxBuilder {
@@ -272,6 +285,7 @@ impl BumpFeeTxBuilder {
             txid,
             fee_rate,
             sequence: None,
+            current_height: None,
         }
     }
 
@@ -282,6 +296,13 @@ impl BumpFeeTxBuilder {
         })
     }
 
+    pub(crate) fn current_height(&self, height: u32) -> Arc<Self> {
+        Arc::new(BumpFeeTxBuilder {
+            current_height: Some(height),
+            ..self.clone()
+        })
+    }
+
     pub(crate) fn finish(&self, wallet: &Arc<Wallet>) -> Result<Arc<Psbt>, CreateTxError> {
         let txid = Txid::from_str(self.txid.as_str()).map_err(|_| CreateTxError::UnknownUtxo {
             outpoint: self.txid.clone(),
@@ -292,6 +313,9 @@ impl BumpFeeTxBuilder {
         if let Some(sequence) = self.sequence {
             tx_builder.set_exact_sequence(Sequence(sequence));
         }
+        if let Some(height) = self.current_height {
+            tx_builder.current_height(height);
+        }
 
         let psbt: BdkPsbt = tx_builder.finish()?;