Add Wallet list_unspent method

CHANGELOG.md

@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- APIs Added
+  - `TxBuilder.add_data(data: Vec<u8>)`
+  - `Wallet.list_unspent()` returns `Vec<LocalUtxo>`
+
 ## [v0.7.0]
 
 - Update BDK to version 0.19.0

src/bdk.udl

@@ -149,6 +149,28 @@ callback interface Progress {
   void update(f32 progress, string? message);
 };
 
+dictionary OutPoint {
+  string txid;
+  u32 vout;
+};
+
+dictionary TxOut {
+  u64 value;
+  string address;
+};
+
+enum KeychainKind {
+  "External",
+  "Internal",
+};
+
+dictionary LocalUtxo {
+  OutPoint outpoint;
+  TxOut txout;
+  KeychainKind keychain;
+  boolean is_spent;
+};
+
 interface Wallet {
   [Throws=BdkError]
   constructor(string descriptor, string? change_descriptor, Network network, DatabaseConfig database_config);
@@ -169,6 +191,9 @@ interface Wallet {
 
   [Throws=BdkError]
   void sync([ByRef] Blockchain blockchain, Progress? progress);
+
+  [Throws=BdkError]
+  sequence<LocalUtxo> list_unspent();
 };
 
 interface PartiallySignedBitcoinTransaction {

src/lib.rs

@@ -15,7 +15,8 @@ use bdk::miniscript::BareCtx;
 use bdk::wallet::AddressIndex as BdkAddressIndex;
 use bdk::wallet::AddressInfo as BdkAddressInfo;
 use bdk::{
-    BlockTime, Error, FeeRate, SignOptions, SyncOptions as BdkSyncOptions, Wallet as BdkWallet,
+    BlockTime, Error, FeeRate, KeychainKind, SignOptions, SyncOptions as BdkSyncOptions,
+    Wallet as BdkWallet,
 };
 use std::convert::{From, TryFrom};
 use std::fmt;
@@ -172,6 +173,51 @@ struct Wallet {
     wallet_mutex: Mutex<BdkWallet<AnyDatabase>>,
 }
 
+pub struct OutPoint {
+    txid: String,
+    vout: u32,
+}
+
+pub struct TxOut {
+    value: u64,
+    address: String,
+}
+
+pub struct LocalUtxo {
+    outpoint: OutPoint,
+    txout: TxOut,
+    keychain: KeychainKind,
+    is_spent: bool,
+}
+
+// This trait is used to convert the bdk TxOut type with field `script_pubkey: Script`
+// into the bdk-ffi TxOut type which has a field `address: String` instead
+trait NetworkLocalUtxo {
+    fn from_utxo(x: &bdk::LocalUtxo, network: Network) -> LocalUtxo;
+}
+
+impl NetworkLocalUtxo for LocalUtxo {
+    fn from_utxo(x: &bdk::LocalUtxo, network: Network) -> LocalUtxo {
+        LocalUtxo {
+            outpoint: OutPoint {
+                txid: x.outpoint.txid.to_string(),
+                vout: x.outpoint.vout,
+            },
+            txout: TxOut {
+                value: x.txout.value,
+                address: bdk::bitcoin::util::address::Address::from_script(
+                    &x.txout.script_pubkey,
+                    network,
+                )
+                .unwrap()
+                .to_string(),
+            },
+            keychain: x.keychain,
+            is_spent: x.is_spent,
+        }
+    }
+}
+
 pub trait Progress: Send + Sync + 'static {
     fn update(&self, progress: f32, message: Option<String>);
 }
@@ -283,6 +329,14 @@ impl Wallet {
         let transactions = self.get_wallet().list_transactions(true)?;
         Ok(transactions.iter().map(Transaction::from).collect())
     }
+
+    fn list_unspent(&self) -> Result<Vec<LocalUtxo>, Error> {
+        let unspents = self.get_wallet().list_unspent()?;
+        Ok(unspents
+            .iter()
+            .map(|u| LocalUtxo::from_utxo(u, self.get_network()))
+            .collect())
+    }
 }
 
 pub struct ExtendedKeyInfo {