Use UDL interface to avoid passing around pointers

app/src/main/java/dev/lonami/talaria/ui/screens/LoginScreen.kt

@@ -19,8 +19,7 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import dev.lonami.talaria.R
 import dev.lonami.talaria.ui.theme.TalariaTheme
-import uniffi.talaria.requestLoginCode
-import uniffi.talaria.signIn
+import uniffi.talaria.LoginProcedure
 
 enum class LoginStage {
     ASK_PHONE,
@@ -106,7 +105,7 @@ fun LoginScreen(onConfirmOtp: () -> Unit, modifier: Modifier = Modifier) {
     var phone by remember { mutableStateOf("") }
     var otp by remember { mutableStateOf("") }
 
-    var tokenPtr by remember { mutableStateOf(0UL) }
+    val loginProcedure by remember { mutableStateOf(LoginProcedure()) }
 
     Column(
         modifier = modifier
@@ -128,7 +127,7 @@ fun LoginScreen(onConfirmOtp: () -> Unit, modifier: Modifier = Modifier) {
                 phone,
                 onPhoneChanged = { phone = it },
                 onSendCode = {
-                    tokenPtr = requestLoginCode(phone)
+                    loginProcedure.requestLoginCode(phone)
                     stage = LoginStage.ASK_CODE
                 }
             )
@@ -136,7 +135,7 @@ fun LoginScreen(onConfirmOtp: () -> Unit, modifier: Modifier = Modifier) {
                 otp,
                 onOtpChanged = { otp = it },
                 onConfirmOtp = {
-                    signIn(tokenPtr, otp)
+                    loginProcedure.signIn(otp)
                     onConfirmOtp()
                 }
             )

native/src/lib.rs

@@ -64,6 +64,10 @@ impl fmt::Display for NativeError {
 
 impl std::error::Error for NativeError {}
 
+struct LoginProcedure {
+    token: Mutex<Option<LoginToken>>,
+}
+
 #[derive(Debug, Clone, Copy)]
 pub enum MessageAck {
     Received,
@@ -199,15 +203,28 @@ pub fn need_login() -> Result<bool> {
     block_on(client.is_authorized()).map_err(|_| NativeError::Network)
 }
 
-pub fn request_login_code(phone: String) -> Result<u64> {
-    let client = CLIENT.get().ok_or(NativeError::Initialization)?;
-    block_on(client.request_login_code(&phone, API_ID, API_HASH))
-        .map(|token| Box::into_raw(Box::new(token)) as u64)
-        .map_err(|_| NativeError::Network)
+impl LoginProcedure {
+    fn new() -> Self {
+        Self {
+            token: Mutex::new(None),
+        }
     }
 
-pub fn sign_in(token_ptr: u64, code: String) -> Result<()> {
-    let token = unsafe { *Box::from_raw(token_ptr as *mut LoginToken) };
+    fn request_login_code(&self, phone: String) -> Result<()> {
+        let client = CLIENT.get().ok_or(NativeError::Initialization)?;
+        let token = block_on(client.request_login_code(&phone, API_ID, API_HASH))
+            .map_err(|_| NativeError::Network)?;
+        *self.token.lock().unwrap() = Some(token);
+        Ok(())
+    }
+
+    fn sign_in(&self, code: String) -> Result<()> {
+        let token = self
+            .token
+            .lock()
+            .unwrap()
+            .take()
+            .ok_or(NativeError::Initialization)?;
         let client = CLIENT.get().ok_or(NativeError::Initialization)?;
 
         block_on(client.sign_in(&token, &code)).map_err(|_| NativeError::Network)?;
@@ -255,6 +272,7 @@ pub fn sign_in(token_ptr: u64, code: String) -> Result<()> {
 
         Ok(())
     }
+}
 
 pub fn get_dialogs() -> Result<Vec<Dialog>> {
     let client = CLIENT.get().ok_or(NativeError::Initialization)?;

native/src/talaria.udl

@@ -25,6 +25,14 @@ dictionary Dialog {
     boolean pinned;
 };
 
+interface LoginProcedure {
+    constructor();
+    [Throws=NativeError]
+    void request_login_code(string phone);
+    [Throws=NativeError]
+    void sign_in(string code);
+};
+
 namespace talaria {
     [Throws=NativeError]
     void init_database(string path);
@@ -33,10 +41,6 @@ namespace talaria {
     [Throws=NativeError]
     boolean need_login();
     [Throws=NativeError]
-    u64 request_login_code(string phone);
-    [Throws=NativeError]
-    void sign_in(u64 tokenPtr, string code);
-    [Throws=NativeError]
     sequence<Dialog> get_dialogs();
     [Throws=NativeError]
     void send_message(string packed, string text);