feat: add memory wallet

bdk-ffi/src/bdk.udl

@@ -271,6 +271,9 @@ interface Wallet {
   [Throws=WalletCreationError]
   constructor(Descriptor descriptor, Descriptor? change_descriptor, string persistence_backend_path, Network network);
 
+  [Name=new_no_persist, Throws=DescriptorError]
+  constructor(Descriptor descriptor, Descriptor? change_descriptor, Network network);
+
   [Throws=PersistenceError]
   AddressInfo reveal_next_address(KeychainKind keychain);
 

bdk-ffi/src/wallet.rs

@@ -2,8 +2,8 @@ use crate::bitcoin::Amount;
 use crate::bitcoin::{FeeRate, OutPoint, Psbt, Script, Transaction};
 use crate::descriptor::Descriptor;
 use crate::error::{
-    CalculateFeeError, CannotConnectError, CreateTxError, PersistenceError, SignerError,
+    CalculateFeeError, CannotConnectError, CreateTxError, DescriptorError, PersistenceError,
-    TxidParseError, WalletCreationError,
+    SignerError, TxidParseError, WalletCreationError,
 };
 use crate::types::{
     AddressInfo, Balance, CanonicalTx, FullScanRequest, LocalOutput, ScriptAmount, SyncRequest,
@@ -49,6 +49,22 @@ impl Wallet {
         })
     }
 
+    pub fn new_no_persist(
+        descriptor: Arc<Descriptor>,
+        change_descriptor: Option<Arc<Descriptor>>,
+        network: Network,
+    ) -> Result<Self, DescriptorError> {
+        let descriptor = descriptor.as_string_private();
+        let change_descriptor = change_descriptor.map(|d| d.as_string_private());
+
+        let wallet: BdkWallet =
+            BdkWallet::new_no_persist(&descriptor, change_descriptor.as_ref(), network)?;
+
+        Ok(Wallet {
+            inner_mutex: Mutex::new(wallet),
+        })
+    }
+
     pub(crate) fn get_wallet(&self) -> MutexGuard<BdkWallet> {
         self.inner_mutex.lock().expect("wallet")
     }