Groot2 crashes when opening monitor mode blackboard viewer if complex types are in the blackboard

[kd-ufr]

Describe the bug
I've added node to my tree that outputs a vector of strings to the blackboard. In older versions of Groot2, you could open the blackboard viewer and complex types would just be left blank. However, if I open the blackboard now it causes Groot2 to crash.

To Reproduce

• have tree that outputs complex data to blackboard
• open groot2
• connect to running tree in monitor mode
• try open blackboard viewer

Expected behavior

• Groot2 doesn't crash

Desktop (please complete the following information):

• OS: Ubuntu
• Version 20.04

Additional context
NA

crash_log.txt

groot2-crash-variable-monitoring.mp4

[facontidavide]

thanks for reporting. I will address this ASAP

[facontidavide]

to be sure that I am able to reproduce the bug, can you describe the complex type?

[kd-ufr]

to be sure that I am able to reproduce the bug, can you describe the complex type?

Thanks Davide - the complex type is a std::vectorstd::string in this instance.

Excerpt from node's header file:

BT::OutputPort<std::vector<std::string>>("values", "Array of parameter values")

Excerpt from node's cpp file:

  std::vector<std::string> values;

  for (const auto & param_value : response->values) {
    switch (param_value.type) {
      case rcl_interfaces::msg::ParameterType::PARAMETER_BOOL:
        values.push_back(param_value.bool_value ? "true" : "false");
        break;
      case rcl_interfaces::msg::ParameterType::PARAMETER_DOUBLE:
        values.push_back(std::to_string(param_value.double_value));
        break;
      default:
        return BT::NodeStatus::FAILURE;
    }
  }

  setOutput("values", values);
  return BT::NodeStatus::SUCCESS;

[facontidavide]

FYI, I just fixed this. new release will be done soon