Handle failure when clearing the db

src/main.rs

@@ -53,9 +53,19 @@ async fn main() -> Result<(), Box<dyn Error>> {
 
     if app_config.clear_db {
         let db_dir = format!("{}", app_config.rocksdb_dir);
-        std::fs::remove_dir_all(db_dir.clone()).unwrap();
-        std::fs::create_dir_all(db_dir.clone()).unwrap();
-        warn!("Cleared db at {:?}", db_dir);
+        if std::path::Path::new(&db_dir).exists() {
+            let remove_result = std::fs::remove_dir_all(db_dir.clone());
+            if let Err(e) = remove_result {
+                error!("Failed to clear db at {:?}: {}", db_dir, e);
+            }
+            let create_result = std::fs::create_dir_all(db_dir.clone());
+            if let Err(e) = create_result {
+                error!("Failed to create db dir at {:?}: {}", db_dir, e);
+            }
+            warn!("Cleared db at {:?}", db_dir);
+        } else {
+            warn!("No db to clear at {:?}", db_dir);
+        }
     }
 
     if app_config.statsd.prefix == "" {