Make use of errors in the UDL

native/src/lib.rs

@@ -11,6 +11,7 @@ use log;
 use log::{error, info, Level};
 use once_cell::sync::OnceCell;
 use std::collections::HashMap;
+use std::fmt;
 use std::future::Future;
 use std::net::SocketAddr;
 use std::net::{Ipv4Addr, Ipv6Addr};
@@ -21,8 +22,6 @@ use tokio::runtime::Runtime;
 
 include!(concat!(env!("OUT_DIR"), "/talaria.uniffi.rs"));
 
-type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
-
 const LOG_MIN_LEVEL: Level = Level::Trace;
 const LOG_TAG: &str = ".native.talari";
 const API_ID: i32 = {
@@ -46,6 +45,25 @@ static RUNTIME: OnceCell<Runtime> = OnceCell::new();
 static CLIENT: OnceCell<Client> = OnceCell::new();
 static DATABASE: Mutex<Option<sqlite::Connection>> = Mutex::new(None);
 
+#[derive(Debug, Clone, Copy)]
+pub enum NativeError {
+    Initialization,
+    Database,
+    Network,
+}
+
+impl fmt::Display for NativeError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::Initialization => write!(f, "a resource could not be initialized correctly"),
+            Self::Database => write!(f, "a query to the local database failed"),
+            Self::Network => write!(f, "a network request could not complete successfully"),
+        }
+    }
+}
+
+impl std::error::Error for NativeError {}
+
 #[derive(Debug, Clone, Copy)]
 pub enum MessageAck {
     Received,
@@ -69,6 +87,8 @@ pub struct Dialog {
     pinned: bool,
 }
 
+type Result<T> = std::result::Result<T, NativeError>;
+
 fn block_on<F: Future>(future: F) -> F::Output {
     if RUNTIME.get().is_none() {
         RUNTIME
@@ -100,7 +120,8 @@ async fn init_client() -> Result<()> {
     let conn = match guard.as_ref() {
         Some(c) => c,
         None => {
-            return Err("Database was not initialized".into());
+            error!("Database was not initialized");
+            return Err(NativeError::Initialization);
         }
     };
 
@@ -108,7 +129,7 @@ async fn init_client() -> Result<()> {
 
     let session = Session::new();
 
-    let sessions = db::get_sessions(conn)?;
+    let sessions = db::get_sessions(conn).map_err(|_| NativeError::Database)?;
     if let Some(s) = sessions.get(0) {
         match (s.user_id, s.dc_id, s.bot) {
             (Some(id), Some(dc), Some(bot)) => session.set_user(id, dc, bot),
@@ -147,41 +168,51 @@ async fn init_client() -> Result<()> {
             ..Default::default()
         },
     })
-    .await?;
+    .await
+    .map_err(|_| NativeError::Network)?;
 
     info!("Connected!");
 
     CLIENT
         .set(client)
-        .map_err(|_| "Client was already initialized")?;
+        .map_err(|_| NativeError::Initialization)?;
 
     Ok(())
 }
 
 async fn need_login() -> Result<bool> {
-    let client = CLIENT.get().ok_or("Client not initialized")?;
+    let client = CLIENT.get().ok_or(NativeError::Initialization)?;
-    Ok(client.is_authorized().await?)
+    client
+        .is_authorized()
+        .await
+        .map_err(|_| NativeError::Network)
 }
 
 async fn request_login_code(phone: &str) -> Result<LoginToken> {
-    let client = CLIENT.get().ok_or("Client not initialized")?;
+    let client = CLIENT.get().ok_or(NativeError::Initialization)?;
-    let token = client.request_login_code(&phone, API_ID, API_HASH).await?;
+    client
-    Ok(token)
+        .request_login_code(&phone, API_ID, API_HASH)
+        .await
+        .map_err(|_| NativeError::Network)
 }
 
 async fn sign_in(token: LoginToken, code: &str) -> Result<()> {
-    let client = CLIENT.get().ok_or("Client not initialized")?;
+    let client = CLIENT.get().ok_or(NativeError::Initialization)?;
-    client.sign_in(&token, &code).await?;
+    client
+        .sign_in(&token, &code)
+        .await
+        .map_err(|_| NativeError::Network)?;
 
     let guard = DATABASE.lock().unwrap();
     let conn = match guard.as_ref() {
         Some(c) => c,
         None => {
-            return Err("Database was not initialized".into());
+            error!("Database was not initialized");
+            return Err(NativeError::Initialization);
         }
     };
 
-    let mut session = db::create_session(conn)?;
+    let mut session = db::create_session(conn).map_err(|_| NativeError::Database)?;
     let s = client.session();
     if let Some(user) = s.get_user() {
         session.user_id = Some(user.id);
@@ -211,79 +242,67 @@ async fn sign_in(token: LoginToken, code: &str) -> Result<()> {
         }
     }
 
-    db::update_session(conn, &session)?;
+    db::update_session(conn, &session).map_err(|_| NativeError::Database)?;
 
     Ok(())
 }
 
 async fn get_dialogs() -> Result<Vec<OgDialog>> {
-    let client = CLIENT.get().ok_or("Client not initialized")?;
+    let client = CLIENT.get().ok_or(NativeError::Initialization)?;
 
     let mut result = Vec::new();
     let mut dialogs = client.iter_dialogs();
-    while let Some(dialog) = dialogs.next().await? {
+    while let Some(dialog) = dialogs.next().await.map_err(|_| NativeError::Network)? {
         result.push(dialog);
     }
     Ok(result)
 }
 
 async fn send_message(chat: PackedChat, text: &str) -> Result<()> {
-    let client = CLIENT.get().ok_or("Client not initialized")?;
+    let client = CLIENT.get().ok_or(NativeError::Initialization)?;
-    client.send_message(chat, text).await?;
+    client
+        .send_message(chat, text)
+        .await
+        .map_err(|_| NativeError::Network)?;
     Ok(())
 }
 
-pub fn initDatabase(path: String) {
+pub fn initDatabase(path: String) -> Result<()> {
     let mut guard = DATABASE.lock().unwrap();
     if guard.is_some() {
         info!("Database is already initialized");
     }
 
     match db::init_connection(&path) {
-        Ok(conn) => *guard = Some(conn),
+        Ok(conn) => {
-        Err(e) => error!("Failed to initialize database: {}", e),
+            *guard = Some(conn);
-    }
+            Ok(())
-}
-
-pub fn initClient() {
-    match block_on(init_client()) {
-        Ok(_) => info!("Client initialized"),
-        Err(e) => error!("Failed to initialize client: {}", e),
-    }
-}
-
-pub fn needLogin() -> bool {
-    match block_on(need_login()) {
-        Ok(login) => login.into(),
-        Err(e) => {
-            error!("Failed to check if user is authorized: {}", e);
-            false.into()
         }
+        Err(e) => Err(NativeError::Database),
     }
 }
 
-pub fn requestLoginCode(phone: String) -> u64 {
+pub fn initClient() -> Result<()> {
-    match block_on(request_login_code(&phone)) {
+    block_on(init_client())
-        Ok(token) => Box::into_raw(Box::new(token)) as u64,
-        Err(e) => {
-            error!("Failed to request login code: {}", e);
-            0 as u64
-        }
-    }
 }
 
-pub fn signIn(token_ptr: u64, code: String) {
+pub fn needLogin() -> Result<bool> {
+    block_on(need_login())
+}
+
+pub fn requestLoginCode(phone: String) -> Result<u64> {
+    block_on(request_login_code(&phone)).map(|token| Box::into_raw(Box::new(token)) as u64)
+}
+
+pub fn signIn(token_ptr: u64, code: String) -> Result<()> {
     let token = unsafe { *Box::from_raw(token_ptr as *mut LoginToken) };
 
-    match block_on(sign_in(token, &code)) {
+    block_on(sign_in(token, &code))
-        Ok(_) => info!("Sign in success"),
-        Err(e) => error!("Failed to sign in: {}", e),
-    }
 }
 
-pub fn getDialogs() -> Vec<Dialog> {
+pub fn getDialogs() -> Result<Vec<Dialog>> {
-    match block_on(get_dialogs()) {
+    block_on(get_dialogs()).map(|dialogs| {
-        Ok(dialogs) => dialogs
+        dialogs
             .into_iter()
             .map(|d| Dialog {
                 id: d.chat().pack().to_hex(),
@@ -316,18 +335,11 @@ pub fn getDialogs() -> Vec<Dialog> {
                     tl::enums::Dialog::Folder(f) => f.pinned,
                 },
             })
-            .collect(),
+            .collect()
-        Err(e) => {
+    })
-            error!("Failed to get dialogs: {}", e);
-            Vec::new()
-        }
-    }
 }
 
-pub fn sendMessage(packed: String, text: String) {
+pub fn sendMessage(packed: String, text: String) -> Result<()> {
     let packed = PackedChat::from_hex(&packed).unwrap();
-    match block_on(send_message(packed, &text)) {
+    block_on(send_message(packed, &text))
-        Ok(_) => info!("Message sent"),
-        Err(e) => error!("Failed to send message: {}", e),
-    }
 }

native/src/talaria.udl

@@ -1,3 +1,10 @@
+[Error]
+enum NativeError {
+  "Initialization",
+  "Database",
+  "Network",
+};
+
 enum MessageAck {
     "Received",
     "Seen",
@@ -19,11 +26,18 @@ dictionary Dialog {
 };
 
 namespace talaria {
+    [Throws=NativeError]
     void initDatabase(string path);
+    [Throws=NativeError]
     void initClient();
+    [Throws=NativeError]
     boolean needLogin();
+    [Throws=NativeError]
     u64 requestLoginCode(string phone);
+    [Throws=NativeError]
     void signIn(u64 tokenPtr, string code);
+    [Throws=NativeError]
     sequence<Dialog> getDialogs();
+    [Throws=NativeError]
     void sendMessage(string packed, string text);
 };