Add error code and raise message too big error at sending time

CURA-11103

include/Arcus/Error.h

@@ -28,6 +28,8 @@ enum class ErrorCode
     InvalidStateError, ///< Socket is in an invalid state.
     InvalidMessageError, ///< Message being handled is a nullptr or otherwise invalid.
     Debug, // Debug messages
+
+    // When changing this list, don't forget to apply the same changes on pyArcus/python/Error.sip
 };
 
 /**

include/Arcus/Socket.h

@@ -114,7 +114,7 @@ class Socket
     /**
      * Send a message across the socket.
      */
-    virtual void sendMessage(MessagePtr message);
+    virtual bool sendMessage(MessagePtr message);
 
     /**
      * Remove and return the next pending message from the queue with condition blocking.

src/Socket.cpp

@@ -203,21 +203,29 @@ void Socket::close()
         delete d->thread;
         d->thread = nullptr;
     }
+
     // Notify all in case of closing because the waiting threads need to know
     // that this socket has been closed and they should not wait any more.
     d->message_received_condition_variable.notify_all();
 }
 
-void Socket::sendMessage(MessagePtr message)
+bool Socket::sendMessage(MessagePtr message)
 {
     if (! message)
     {
         d->error(ErrorCode::InvalidMessageError, "Message cannot be nullptr");
-        return;
+        return false;
+    }
+
+    if (message->ByteSizeLong() > Private::message_size_maximum)
+    {
+        d->error(ErrorCode::MessageTooBigError, "Message is too big to be sent");
+        return false;
     }
 
     std::lock_guard<std::mutex> lock(d->sendQueueMutex);
     d->sendQueue.push_back(message);
+    return true;
 }
 
 MessagePtr Socket::takeNextMessage()

src/Socket_p.h

@@ -338,20 +338,14 @@ void Socket::Private::run()
 // Send a message to the connected socket.
 void Socket::Private::sendMessage(const MessagePtr& message)
 {
-    const uint32_t message_size = message->ByteSizeLong();
-    if (message_size > message_size_maximum)
-    {
-        error(ErrorCode::MessageTooBigError, "Message is too big to be sent");
-        return;
-    }
-
     const uint32_t header = (ARCUS_SIGNATURE << 16) | (VERSION_MAJOR << 8) | (VERSION_MINOR);
     if (platform_socket.writeUInt32(header) == -1)
     {
         error(ErrorCode::SendFailedError, "Could not send message header");
         return;
     }
 
+    const uint32_t message_size = message->ByteSizeLong();
     if (platform_socket.writeUInt32(message_size) == -1)
     {
         error(ErrorCode::SendFailedError, "Could not send message size");