Simplified driver code a bit

side-node/src/bitcoin/clients/esplora.rs

@@ -1,4 +1,4 @@
-use std::{collections::BTreeSet, fs, io::Write};
+use std::fs;
 
 use bdk::keys::bip39::Mnemonic;
 use bdk_esplora::{
@@ -6,7 +6,7 @@ use bdk_esplora::{
     EsploraAsyncExt,
 };
 use bdk_wallet::{
-    bitcoin::{Address, Amount, Network, Script},
+    bitcoin::{Address, Amount, Network},
     chain::ConfirmationTimeHeightAnchor,
     keys::{DerivableKey, ExtendedKey},
     wallet::AddressInfo,

side-node/src/bitcoin/driver.rs

@@ -13,29 +13,33 @@ pub(crate) async fn simple_transfer() -> Result<(), anyhow::Error> {
     let _next_address = dave.next_unused_address()?;
 
     let _ = dave.balance();
-
     dave.sync().await?;
-    let dave_balance = dave.balance();
+    let _ = dave.balance();
-    let sammy_address = sammy.next_unused_address()?.address;
 
     let _sammy = sammy.balance();
     sammy.sync().await?;
-    let _sammy = sammy.balance();
+    let _ = sammy.balance();
+
 
     let send_amount = Amount::from_sat(500);
+   ensure_enough_sats(dave, send_amount);
 
-    if dave_balance.total() < send_amount {
+    let sammy_address = sammy.next_unused_address()?.address;
+    let tx = dave.build_and_sign_send_tx(sammy_address, send_amount)?;
+    dave.broadcast(&tx).await?;
+
+    Ok(())
+}
+
+/// Exit if the wallet does not have enough sats to send.
+fn ensure_enough_sats(wallet: EsploraWallet, send_amount: bitcoin::Amount) -> _ {
+    if wallet.balance().total() < send_amount {
         tracing::error!(
             "Please send at least {} sats to the receiving address. Exiting.",
             send_amount
         );
         std::process::exit(0);
     }
-
-    let tx = dave.build_and_sign_send_tx(sammy_address, send_amount)?;
-    dave.broadcast(&tx).await?;
-
-    Ok(())
 }
 
 pub(crate) async fn htlc() -> anyhow::Result<()> {