pythonscript.h

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
#pragma once
 
// Pybind includes
#include <pybind11/pybind11.h>
#include <pybind11/stl.h>
 
// Nap includes
#include <nap/resource.h>
#include <nap/logger.h>
#include <rtti/factory.h>
#include <utility/errorstate.h>
 
namespace nap 
{
 
    // Forward declarations
    class PythonScriptService;
 
    class NAPAPI PythonScript : public Resource
    {
        RTTI_ENABLE(Resource)
    public:
        PythonScript(PythonScriptService& service);
 
        std::string mPath; 
 
        bool init(utility::ErrorState& errorState) override;
 
        template <typename ReturnType, typename ...Args>
        bool get(const std::string& identifier, utility::ErrorState& errorState, ReturnType& returnValue, Args&&... args);
 
        template <typename ...Args>
        bool call(const std::string& identifier, utility::ErrorState& errorState, Args&&... args);
 
        pybind11::object get(const std::string& symbol);
 
    private:
        pybind11::module mModule;
        PythonScriptService* mService = nullptr;
    };
 
 
    template <typename ReturnType, typename ...Args>
    bool PythonScript::get(const std::string& identifier, utility::ErrorState& errorState, ReturnType& returnValue, Args&&... args)
    {
        try
        {
            returnValue = mModule.attr(identifier.c_str())(std::forward<Args>(args)...).template cast<ReturnType>();
        }
        catch (const pybind11::error_already_set& err)
        {
            errorState.fail("Runtime python error while executing %s: %s", mPath.c_str(), err.what());
            return false;
        }
        return true;
    }
 
 
    template <typename ...Args>
    bool PythonScript::call(const std::string& identifier, utility::ErrorState& errorState, Args&&... args)
    {
        try
        {
            mModule.attr(identifier.c_str())(std::forward<Args>(args)...);
        }
        catch (const pybind11::error_already_set& err)
        {
            errorState.fail("Runtime python error while executing %s: %s", mPath.c_str(), err.what());
            return false;
        }
        return true;
    }
 
 
    // Object creator used for constructing the the PythonScript
    using PythonScriptObjectCreator = rtti::ObjectCreator<PythonScript, PythonScriptService>;
 
}