Expose set_recipients API from TxBuiler (#186)

src/bdk.udl

@@ -168,6 +168,11 @@ dictionary LocalUtxo {
   boolean is_spent;
 };
 
+dictionary AddressAmount {
+  string address;
+  u64 amount;
+};
+
 interface Wallet {
   [Throws=BdkError]
   constructor(string descriptor, string? change_descriptor, Network network, DatabaseConfig database_config);
@@ -235,6 +240,8 @@ interface TxBuilder {
 
   TxBuilder add_data(sequence<u8> data);
   
+  TxBuilder set_recipients(sequence<AddressAmount> recipients);
+  
   [Throws=BdkError]
   PartiallySignedBitcoinTransaction finish([ByRef] Wallet wallet);
 };

src/lib.rs

@@ -37,6 +37,11 @@ uniffi_macros::include_scaffolding!("bdk");
 
 type BdkError = Error;
 
+pub struct AddressAmount {
+    pub address: String,
+    pub amount: u64,
+}
+
 pub struct AddressInfo {
     pub index: u32,
     pub address: String,
@@ -421,6 +426,17 @@ impl TxBuilder {
         })
     }
 
+    fn set_recipients(&self, recipients: Vec<AddressAmount>) -> Arc<Self> {
+        let recipients = recipients
+            .iter()
+            .map(|address_amount| (address_amount.address.clone(), address_amount.amount))
+            .collect();
+        Arc::new(TxBuilder {
+            recipients,
+            ..self.clone()
+        })
+    }
+
     fn add_unspendable(&self, unspendable: OutPoint) -> Arc<Self> {
         let mut unspendable_hash_set = self.unspendable.clone();
         unspendable_hash_set.insert(unspendable);