Merge pull request #184 from thunderbiscuit/block-height-hash

Add `get_height` and `get_block_hash` methods on blockchain

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
     - `derive(DerivationPath)` derives and returns child DescriptorPublicKey
     - `extend(DerivationPath)` extends and returns DescriptorPublicKey
     - `as_string()` returns DescriptorPublicKey as String
+  - Add to `interface Blockchain` the `get_height()` and `get_block_hash()` methods [#184]
 - Interfaces Added [#154]
   - `DescriptorSecretKey`
   - `DescriptorPublicKey`
@@ -28,6 +29,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - `restore_extended_key`, returned ExtendedKeyInfo
 
 [#154]: https://github.com/bitcoindevkit/bdk-ffi/pull/154
+[#184]: https://github.com/bitcoindevkit/bdk-ffi/pull/184
 
 ## [v0.8.0]
 - Update BDK to version 0.20.0 [#169]

src/bdk.udl

@@ -134,6 +134,12 @@ interface Blockchain {
 
   [Throws=BdkError]
   void broadcast([ByRef] PartiallySignedBitcoinTransaction psbt);
+
+  [Throws=BdkError]
+  u32 get_height();
+
+  [Throws=BdkError]
+  string get_block_hash(u32 height);
 };
 
 callback interface Progress {

src/lib.rs

@@ -4,6 +4,8 @@ use bdk::bitcoin::util::bip32::DerivationPath as BdkDerivationPath;
 use bdk::bitcoin::util::psbt::PartiallySignedTransaction;
 use bdk::bitcoin::{Address, Network, OutPoint as BdkOutPoint, Script, Txid};
 use bdk::blockchain::any::{AnyBlockchain, AnyBlockchainConfig};
+use bdk::blockchain::GetBlockHash;
+use bdk::blockchain::GetHeight;
 use bdk::blockchain::{
     electrum::ElectrumBlockchainConfig, esplora::EsploraBlockchainConfig, ConfigurableBlockchain,
 };
@@ -174,6 +176,16 @@ impl Blockchain {
         let tx = psbt.internal.lock().unwrap().clone().extract_tx();
         self.get_blockchain().broadcast(&tx)
     }
+
+    fn get_height(&self) -> Result<u32, Error> {
+        self.get_blockchain().get_height()
+    }
+
+    fn get_block_hash(&self, height: u32) -> Result<String, Error> {
+        self.get_blockchain()
+            .get_block_hash(u64::from(height))
+            .map(|hash| hash.to_string())
+    }
 }
 
 struct Wallet {