Check for existing wallet

lib/src/lib.rs

@@ -16,9 +16,23 @@ lazy_static! {
     static ref LIGHTCLIENT: Mutex<RefCell<Option<LightClient>>> = Mutex::new(RefCell::new(None));
 }
 
+// Check if there is an existing wallet
+#[no_mangle]
+pub extern fn litelib_wallet_exists(chain_name: *const c_char) -> bool {
+    let chain_name_str = unsafe {
+        assert!(!chain_name.is_null());
+
+        CStr::from_ptr(chain_name).to_string_lossy().into_owned()
+    };
+
+    let config = LightClientConfig::create_unconnected(chain_name_str);
+
+    config.wallet_exists()
+}
+
 // Initialize a new lightclient and store its value
 #[no_mangle]
-pub extern fn litelib_initialze(dangerous: bool, server: *const c_char) -> *mut c_char {
+pub extern fn litelib_initialze_existing(dangerous: bool, server: *const c_char) -> *mut c_char {
     let server_str = unsafe {
         assert!(!server.is_null());
 
@@ -34,7 +48,7 @@ pub extern fn litelib_initialze(dangerous: bool, server: *const c_char) -> *mut
         }
     };
 
-    let lightclient = match LightClient::new(None, &config, latest_block_height) {
+    let lightclient = match LightClient::read_from_disk(&config) {
         Ok(l) => l,
         Err(e) => {
             let e_str = CString::new(format!("Error: {}", e)).unwrap();

lib/zecwalletlitelib.h

@@ -2,12 +2,13 @@
 #define _ZEC_PAPER_RUST_H
 
 #ifdef __cplusplus
-extern "C"{
+extern "C" {
 #endif
 
-extern char * litelib_initialze         (bool dangerous, const char* server);
-extern char * litelib_execute           (const char* s, const char* args);
-extern void   litelib_rust_free_string  (char* s);
+extern bool   litelib_wallet_exists      (const char* chain_name);
+extern char * litelib_initialze_existing (bool dangerous, const char* server);
+extern char * litelib_execute            (const char* s, const char* args);
+extern void   litelib_rust_free_string   (char* s);
 
 #ifdef __cplusplus
 }