feat: Expose latest_checkpoint in Wallet implementation

Author: ItoroD

bdk-ffi/src/types.rs

@@ -1,8 +1,9 @@
-use crate::bitcoin::{Address, Amount, OutPoint, Script, Transaction, TxOut};
+use crate::bitcoin::{Address, Amount, BlockHash, OutPoint, Script, Transaction, TxOut};
 use crate::error::{CreateTxError, RequestBuilderError};
 
 use bdk_core::bitcoin::absolute::LockTime as BdkLockTime;
 use bdk_core::spk_client::SyncItem;
+use bdk_core::BlockId as BdkBlockId;
 
 use bdk_wallet::bitcoin::Transaction as BdkTransaction;
 use bdk_wallet::chain::spk_client::FullScanRequest as BdkFullScanRequest;
@@ -66,7 +67,7 @@ impl From<BdkChainPosition<BdkConfirmationBlockTime>> for ChainPosition {
             } => {
                 let block_id = BlockId {
                     height: anchor.block_id.height,
-                    hash: anchor.block_id.hash.to_string(),
+                    hash: Arc::new(BlockHash(anchor.block_id.hash)),
                 };
                 ChainPosition::Confirmed {
                     confirmation_block_time: ConfirmationBlockTime {
@@ -98,7 +99,16 @@ pub struct BlockId {
     /// The height of the block.
     pub height: u32,
     /// The hash of the block.
-    pub hash: String,
+    pub hash: Arc<BlockHash>,
+}
+
+impl From<BdkBlockId> for BlockId {
+    fn from(block_id: BdkBlockId) -> Self {
+        BlockId {
+            height: block_id.height,
+            hash: Arc::from(BlockHash(block_id.hash)),
+        }
+    }
 }
 
 /// A transaction that is deemed to be part of the canonical history.

bdk-ffi/src/wallet.rs

@@ -6,8 +6,9 @@ use crate::error::{
 };
 use crate::store::Connection;
 use crate::types::{
-    AddressInfo, Balance, CanonicalTx, FullScanRequestBuilder, KeychainAndIndex, LocalOutput,
-    Policy, SentAndReceivedValues, SignOptions, SyncRequestBuilder, UnconfirmedTx, Update,
+    AddressInfo, Balance, BlockId, CanonicalTx, FullScanRequestBuilder, KeychainAndIndex,
+    LocalOutput, Policy, SentAndReceivedValues, SignOptions, SyncRequestBuilder, UnconfirmedTx,
+    Update,
 };
 
 use bdk_wallet::bitcoin::{Network, Txid};
@@ -416,6 +417,11 @@ impl Wallet {
                 rusqlite_error: e.to_string(),
             })
     }
+
+    /// Returns the latest checkpoint.
+    pub fn latest_checkpoint(&self) -> BlockId {
+        self.get_wallet().latest_checkpoint().block_id().into()
+    }
 }
 
 impl Wallet {

bdk-jvm/lib/src/test/kotlin/org/bitcoindevkit/LiveTransactionTest.kt

@@ -40,5 +40,8 @@ class LiveTransactionTest {
         println("Is explicitly RBF: ${transaction.isExplicitlyRbf()}")
         println("Inputs: ${transaction.input()}")
         println("Outputs: ${transaction.output()}")
+
+        val blockId = wallet.latestCheckpoint().toString()
+        println("Latest checkpoint: $blockId")
     }
 }