refactor: use macros for CanonicalTx

Author: rustaceanrob

bdk-ffi/src/bdk.udl

@@ -309,10 +309,7 @@ typedef dictionary TxOut;
 
 typedef enum ChainPosition;
 
-dictionary CanonicalTx {
-  Transaction transaction;
-  ChainPosition chain_position;
-};
+typedef dictionary CanonicalTx;
 
 /// Builds a [`FullScanRequest`].
 interface FullScanRequestBuilder {

bdk-ffi/src/lib.rs

@@ -44,7 +44,6 @@ use crate::keys::DescriptorPublicKey;
 use crate::keys::DescriptorSecretKey;
 use crate::keys::Mnemonic;
 use crate::types::AddressInfo;
-use crate::types::CanonicalTx;
 use crate::types::ChainPosition;
 use crate::types::Condition;
 use crate::types::FullScanRequest;

bdk-ffi/src/types.rs

@@ -101,8 +101,12 @@ pub struct BlockId {
     pub hash: String,
 }
 
+/// A transaction that is deemed to be part of the canonical history.
+#[derive(uniffi::Record)]
 pub struct CanonicalTx {
+    /// The transaction.
     pub transaction: Arc<Transaction>,
+    /// How the transaction is observed in the canonical chain (confirmed or unconfirmed).
     pub chain_position: ChainPosition,
 }