fix(alice): wallet health check during swap setup

bitcoin-wallet/src/lib.rs

@@ -49,6 +49,8 @@ pub trait BitcoinWallet: Send + Sync {
 
     async fn sync(&self) -> Result<()>;
 
+    async fn health_check(&self) -> Result<()>;
+
     async fn subscribe_to(&self, tx: Box<dyn Watchable>) -> Subscription;
 
     async fn status_of_script(&self, tx: &dyn Watchable) -> Result<ScriptStatus>;

bitcoin-wallet/src/wallet.rs

@@ -1096,6 +1096,13 @@ impl Wallet {
         .context("Failed to sync Bitcoin wallet after retries")
     }
 
+    pub async fn health_check(&self) -> Result<()> {
+        self.electrum_client
+            .update_block_height()
+            .await
+            .context("Bitcoin wallet failed to reach the Electrum backend")
+    }
+
     /// Calculate the fee for a given transaction.
     ///
     /// Will fail if the transaction inputs are not owned by this wallet.
@@ -1663,7 +1670,7 @@ impl Client {
     }
 
     /// Update the block height.
-    async fn update_block_height(&self) -> Result<()> {
+    pub async fn update_block_height(&self) -> Result<()> {
         let latest_block = self
             .inner
             .call_async("block_headers_subscribe", |client| {
@@ -2166,6 +2173,10 @@ impl BitcoinWallet for Wallet {
         Wallet::sync(self).await
     }
 
+    async fn health_check(&self) -> Result<()> {
+        Wallet::health_check(self).await
+    }
+
     async fn subscribe_to(&self, tx: Box<dyn Watchable>) -> Subscription {
         Wallet::subscribe_to(self, tx).await
     }
@@ -2976,6 +2987,10 @@ impl BitcoinWallet for Wallet<Connection, StaticFeeRate> {
         unimplemented!("stub method called erroneously")
     }
 
+    async fn health_check(&self) -> Result<()> {
+        unimplemented!("stub method called erroneously")
+    }
+
     async fn subscribe_to(&self, tx: Box<dyn Watchable>) -> Subscription {
         unimplemented!("stub method called erroneously")
     }

swap/src/asb/event_loop.rs

@@ -1292,6 +1292,11 @@ async fn capture_wallet_snapshot(
 ) -> Result<WalletSnapshot> {
     let start_time = Instant::now();
 
+    bitcoin_wallet
+        .health_check()
+        .await
+        .context("Bitcoin wallet health check failed while capturing wallet snapshot")?;
+
     let unlocked_balance = monero_wallet.main_wallet().await.unlocked_balance().await?;
     let total_balance = monero_wallet.main_wallet().await.total_balance().await?;