add optional height param to clear command for rescan-from-height

lib/src/commands.rs

@@ -132,8 +132,16 @@ impl Command for ClearCommand {
         "Clear the wallet state, rolling back the wallet to an empty state.".to_string()
     }
 
-    fn exec(&self, _args: &[&str], lightclient: &LightClient) -> String {
+    fn exec(&self, args: &[&str], lightclient: &LightClient) -> String {
-       lightclient.clear_state();
+       if !args.is_empty() {
+           if let Ok(height) = args[0].parse::<u64>() {
+               lightclient.clear_state_from(height);
+           } else {
+               return format!("Error: invalid height '{}'", args[0]);
+           }
+       } else {
+           lightclient.clear_state();
+       }
        
        let result = object!{ "result" => "success" };
        

lib/src/lightclient.rs

@@ -1274,12 +1274,16 @@ pub fn start_mempool_monitor(lc: Arc<LightClient>) -> Result<(), String> {
     }
 
     pub fn clear_state(&self) {
+        self.clear_state_from(self.wallet.read().unwrap().get_birthday());
+    }
+
+    pub fn clear_state_from(&self, height: u64) {
         // First, clear the state from the wallet
         self.wallet.read().unwrap().clear_blocks();
 
         // Then set the initial block
-        self.set_wallet_initial_state(self.wallet.read().unwrap().get_birthday());
+        self.set_wallet_initial_state(height);
-        info!("Cleared wallet state");        
+        info!("Cleared wallet state to height {}", height);
     }
 
     pub fn do_rescan(&self) -> Result<JsonValue, String> {