add custom fee

lib/src/lightclient.rs

@@ -1252,6 +1252,7 @@ pub fn start_mempool_monitor(lc: Arc<LightClient>) -> Result<(), String> {
         }
 
         let addr = address.or(self.wallet.read().unwrap().get_all_zaddresses().get(0).map(|s| s.clone())).unwrap();
+        let fee: u64 = DEFAULT_FEE.try_into().unwrap();
 
         let result = {
             let _lock = self.sync_lock.lock().unwrap();
@@ -1260,6 +1261,7 @@ pub fn start_mempool_monitor(lc: Arc<LightClient>) -> Result<(), String> {
                 &self.sapling_spend, &self.sapling_output, 
                 true, 
                 vec![(&addr, tbal - fee, None)],
+                &fee,
                 |txbytes| broadcast_raw_tx(&self.get_server_uri(),self.config.no_cert_verification, txbytes)
             )
         };
@@ -1600,7 +1602,7 @@ pub fn start_mempool_monitor(lc: Arc<LightClient>) -> Result<(), String> {
             crx.iter().take(num_fetches).collect::<Result<Vec<()>, String>>()  
     }
 
-    pub fn do_send(&self, addrs: Vec<(&str, u64, Option<String>)>) -> Result<String, String> {
+    pub fn do_send(&self, addrs: Vec<(&str, u64, Option<String>)>, fee: &u64) -> Result<String, String> {
         if !self.wallet.read().unwrap().is_unlocked_for_spending() {
             error!("Wallet is locked");
             return Err("Wallet is locked".to_string());
@@ -1616,6 +1618,7 @@ pub fn start_mempool_monitor(lc: Arc<LightClient>) -> Result<(), String> {
                 &self.sapling_spend, &self.sapling_output,
                 false,
                 addrs,
+                fee,
                 |txbytes| broadcast_raw_tx(&self.get_server_uri(), self.config.no_cert_verification, txbytes)
             )
         };