Improved socket io error handling

native/serverconnection/src/connection/ServerConnection.cpp

@@ -200,6 +200,26 @@ void ServerConnection::schedule_resend(const std::chrono::system_clock::time_poi
 		this->event_condition.notify_one();
 	}
 }
+
+inline std::string wsa_error_str(int code) {
+    int err;
+    char msgbuf[256];   // for a message up to 255 bytes.
+    msgbuf[0] = '\0';    // Microsoft doesn't guarantee this on man page.
+
+    err = WSAGetLastError();
+    FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,   // flags
+                  NULL,                // lpsource
+                  err,                 // message id
+                  MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),    // languageid
+                  msgbuf,              // output buffer
+                  sizeof(msgbuf),     // size of msgbuf, bytes
+                  NULL);               // va_list of arguments
+
+    if (!*msgbuf)
+        sprintf(msgbuf, "%d", err);  // provide error # if no string available
+    return std::string{msgbuf};
+}
+
 NAN_METHOD(ServerConnection::connect) {
 	if(!this->protocol_handler) {
 		Nan::ThrowError("ServerConnection not initialized");
@@ -304,7 +324,15 @@ NAN_METHOD(ServerConnection::connect) {
 	}
 
 	this->socket->on_data = [&](const pipes::buffer_view& buffer) { this->protocol_handler->progress_packet(buffer); };
-    this->socket->on_fatal_error = [&](int, int) { this->close_connection(); };
+    this->socket->on_fatal_error = [&](int code, int detail) {
+#if WIN32
+        auto message = wsa_error_str(detail);
+#else
+        auto message = strerror(detail);
+#endif
+        this->execute_callback_disconnect.call((code == 1 ? tr("Failed to received data: ") : tr("Failed to send data: ")) + message, false);
+        this->close_connection();
+    };
 
 	if(teamspeak->IsBoolean() && teamspeak->BooleanValue(info.GetIsolate()))
 		this->protocol_handler->server_type = server_type::TEAMSPEAK;