feat: expose get_tx method on wallet type

bdk-ffi/src/bdk.udl

@@ -104,6 +104,11 @@ interface DescriptorError {
     Hex(string e);
 };
 
+[Error]
+interface TxidParseError {
+  InvalidTxid(string txid);
+};
+
 // ------------------------------------------------------------------------
 // bdk crate - types module
 // ------------------------------------------------------------------------
@@ -212,6 +217,9 @@ interface Wallet {
 
   sequence<CanonicalTx> transactions();
 
+  [Throws=TxidParseError]
+  CanonicalTx? get_tx(string txid);
+
   [Throws=CalculateFeeError]
   u64 calculate_fee([ByRef] Transaction tx);
 

bdk-ffi/src/error.rs

@@ -109,6 +109,12 @@ pub enum FeeRateError {
     ArithmeticOverflow,
 }
 
+#[derive(Debug, thiserror::Error)]
+pub enum TxidParseError {
+    #[error("invalid txid: {txid}")]
+    InvalidTxid { txid: String },
+}
+
 #[derive(Debug, thiserror::Error)]
 pub enum AddressError {
     #[error("base58 address encoding error")]
@@ -318,12 +324,6 @@ impl From<std::io::Error> for PersistenceError {
     }
 }
 
-// impl From<DescriptorError> for Alpha3Error {
-//     fn from(_: DescriptorError) -> Self {
-//         Alpha3Error::Generic
-//     }
-// }
-
 impl From<AllowShrinkingError> for Alpha3Error {
     fn from(_: AllowShrinkingError) -> Self {
         Alpha3Error::Generic

bdk-ffi/src/lib.rs

@@ -22,6 +22,7 @@ use crate::error::FeeRateError;
 use crate::error::PersistenceError;
 use crate::error::PsbtParseError;
 use crate::error::TransactionError;
+use crate::error::TxidParseError;
 use crate::error::WalletCreationError;
 use crate::esplora::EsploraClient;
 use crate::keys::DerivationPath;

bdk-ffi/src/wallet.rs

@@ -1,6 +1,8 @@
 use crate::bitcoin::{OutPoint, PartiallySignedTransaction, Script, Transaction};
 use crate::descriptor::Descriptor;
-use crate::error::{Alpha3Error, CalculateFeeError, PersistenceError, WalletCreationError};
+use crate::error::{
+    Alpha3Error, CalculateFeeError, PersistenceError, TxidParseError, WalletCreationError,
+};
 use crate::types::{AddressIndex, AddressInfo, Balance, CanonicalTx, FeeRate, ScriptAmount};
 
 use bdk::bitcoin::blockdata::script::ScriptBuf as BdkScriptBuf;
@@ -108,6 +110,12 @@ impl Wallet {
             .collect()
     }
 
+    pub fn get_tx(&self, txid: String) -> Result<Option<CanonicalTx>, TxidParseError> {
+        let txid =
+            Txid::from_str(txid.as_str()).map_err(|_| TxidParseError::InvalidTxid { txid })?;
+        Ok(self.get_wallet().get_tx(txid).map(|tx| tx.into()))
+    }
+
     pub fn calculate_fee(&self, tx: &Transaction) -> Result<u64, CalculateFeeError> {
         self.get_wallet()
             .calculate_fee(&tx.into())