core, web_service: Check for error when registering rooms

The `Register()` function can now handle error results and the error will be passed immediately to the Qt frontend, instead of being ignored silently and failing later with a "Room is not registered".

src/core/announce_multiplayer_session.cpp

@@ -29,19 +29,23 @@ AnnounceMultiplayerSession::AnnounceMultiplayerSession() {
 #endif
 }
 
-void AnnounceMultiplayerSession::Register() {
+Common::WebResult AnnounceMultiplayerSession::Register() {
     std::shared_ptr<Network::Room> room = Network::GetRoom().lock();
     if (!room) {
-        return;
+        return Common::WebResult{Common::WebResult::Code::LibError, "Network is not initialized"};
     }
     if (room->GetState() != Network::Room::State::Open) {
-        return;
+        return Common::WebResult{Common::WebResult::Code::LibError, "Room is not open"};
     }
     UpdateBackendData(room);
-    std::string result = backend->Register();
+    Common::WebResult result = backend->Register();
+    if (result.result_code != Common::WebResult::Code::Success) {
+        return result;
+    }
     LOG_INFO(WebService, "Room has been registered");
-    room->SetVerifyUID(result);
+    room->SetVerifyUID(result.returned_data);
     registered = true;
+    return Common::WebResult{Common::WebResult::Code::Success};
 }
 
 void AnnounceMultiplayerSession::Start() {
@@ -95,9 +99,22 @@ void AnnounceMultiplayerSession::UpdateBackendData(std::shared_ptr<Network::Room
 }
 
 void AnnounceMultiplayerSession::AnnounceMultiplayerLoop() {
+    // Invokes all current bound error callbacks.
+    const auto ErrorCallback = [this](Common::WebResult result) {
+        std::lock_guard<std::mutex> lock(callback_mutex);
+        for (auto callback : error_callbacks) {
+            (*callback)(result);
+        }
+    };
+
     if (!registered) {
-        Register();
+        Common::WebResult result = Register();
+        if (result.result_code != Common::WebResult::Code::Success) {
+            ErrorCallback(result);
+            return;
+        }
     }
+
     auto update_time = std::chrono::steady_clock::now();
     std::future<Common::WebResult> future;
     while (!shutdown_event.WaitUntil(update_time)) {
@@ -112,15 +129,15 @@ void AnnounceMultiplayerSession::AnnounceMultiplayerLoop() {
         UpdateBackendData(room);
         Common::WebResult result = backend->Update();
         if (result.result_code != Common::WebResult::Code::Success) {
-            std::lock_guard lock(callback_mutex);
-            for (auto callback : error_callbacks) {
-                (*callback)(result);
-            }
+            ErrorCallback(result);
         }
         if (result.result_string == "404") {
             registered = false;
             // Needs to register the room again
-            Register();
+            Common::WebResult result = Register();
+            if (result.result_code != Common::WebResult::Code::Success) {
+                ErrorCallback(result);
+            }
         }
     }
 }

src/core/announce_multiplayer_session.h

@@ -44,8 +44,11 @@ public:
      */
     void UnbindErrorCallback(CallbackHandle handle);
 
-    /// Registers a room to web services
-    void Register();
+    /**
+     * Registers a room to web services
+     * @return The result of the registration attempt.
+     */
+    Common::WebResult Register();
 
     /**
      * Starts the announce of a room to web services