Move error message on sync _into_ the function

The bitcoin::Wallet::sync_wallet function doesn't do anything else
other than delegating. As such, we have just as much information
about what went wrong inside this function as we have outside.

By moving the .context call into the function, we can avoid repeating
us on every call-site.

swap/src/bin/asb.rs

@@ -141,10 +141,7 @@ async fn init_wallets(
     )
     .await?;
 
-    bitcoin_wallet
-        .sync_wallet()
-        .await
-        .expect("Could not sync btc wallet");
+    bitcoin_wallet.sync_wallet().await?;
 
     let bitcoin_balance = bitcoin_wallet.balance().await?;
     info!(

swap/src/bin/swap_cli.rs

@@ -256,10 +256,7 @@ async fn init_bitcoin_wallet(
     )
     .await?;
 
-    wallet
-        .sync_wallet()
-        .await
-        .context("failed to sync balance of bitcoin wallet")?;
+    wallet.sync_wallet().await?;
 
     Ok(wallet)
 }

swap/src/bitcoin/wallet.rs

@@ -106,7 +106,12 @@ impl Wallet {
     }
 
     pub async fn sync_wallet(&self) -> Result<()> {
-        self.inner.lock().await.sync(noop_progress(), None)?;
+        self.inner
+            .lock()
+            .await
+            .sync(noop_progress(), None)
+            .context("failed to sync balance of Bitcoin wallet")?;
+
         Ok(())
     }
 

swap/tests/testutils/mod.rs

@@ -151,10 +151,7 @@ impl TestContext {
 
         assert!(matches!(state, AliceState::BtcRedeemed));
 
-        self.alice_bitcoin_wallet
-            .sync_wallet()
-            .await
-            .expect("Could not sync wallet");
+        self.alice_bitcoin_wallet.sync_wallet().await.unwrap();
 
         let btc_balance_after_swap = self.alice_bitcoin_wallet.as_ref().balance().await.unwrap();
         assert_eq!(
@@ -184,10 +181,7 @@ impl TestContext {
 
         assert!(matches!(state, AliceState::XmrRefunded));
 
-        self.alice_bitcoin_wallet
-            .sync_wallet()
-            .await
-            .expect("Could not sync wallet");
+        self.alice_bitcoin_wallet.sync_wallet().await.unwrap();
 
         let btc_balance_after_swap = self.alice_bitcoin_wallet.as_ref().balance().await.unwrap();
         assert_eq!(btc_balance_after_swap, self.alice_starting_balances.btc);
@@ -206,10 +200,7 @@ impl TestContext {
     pub async fn assert_alice_punished(&self, state: AliceState) {
         assert!(matches!(state, AliceState::BtcPunished));
 
-        self.alice_bitcoin_wallet
-            .sync_wallet()
-            .await
-            .expect("Could not sync wallet");
+        self.alice_bitcoin_wallet.sync_wallet().await.unwrap();
 
         let btc_balance_after_swap = self.alice_bitcoin_wallet.as_ref().balance().await.unwrap();
         assert_eq!(
@@ -228,10 +219,7 @@ impl TestContext {
     }
 
     pub async fn assert_bob_redeemed(&self, state: BobState) {
-        self.bob_bitcoin_wallet
-            .sync_wallet()
-            .await
-            .expect("Could not sync wallet");
+        self.bob_bitcoin_wallet.sync_wallet().await.unwrap();
 
         let lock_tx_id = if let BobState::XmrRedeemed { tx_lock_id } = state {
             tx_lock_id
@@ -263,10 +251,7 @@ impl TestContext {
     }
 
     pub async fn assert_bob_refunded(&self, state: BobState) {
-        self.bob_bitcoin_wallet
-            .sync_wallet()
-            .await
-            .expect("Could not sync wallet");
+        self.bob_bitcoin_wallet.sync_wallet().await.unwrap();
 
         let lock_tx_id = if let BobState::BtcRefunded(state4) = state {
             state4.tx_lock_id()
@@ -300,10 +285,7 @@ impl TestContext {
     }
 
     pub async fn assert_bob_punished(&self, state: BobState) {
-        self.bob_bitcoin_wallet
-            .sync_wallet()
-            .await
-            .expect("Could not sync wallet");
+        self.bob_bitcoin_wallet.sync_wallet().await.unwrap();
 
         let lock_tx_id = if let BobState::BtcPunished { tx_lock_id } = state {
             tx_lock_id
@@ -654,10 +636,7 @@ async fn init_test_wallets(
         let max_retries = 30u8;
         loop {
             retries += 1;
-            btc_wallet
-                .sync_wallet()
-                .await
-                .expect("Could not sync btc wallet");
+            btc_wallet.sync_wallet().await.unwrap();
 
             let btc_balance = btc_wallet.balance().await.unwrap();