magnum-bindings/src/python/corrade/pluginmanager.cpp

/*
    This file is part of Magnum.

    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
                2020, 2021, 2022, 2023 Vladimír Vondruš <mosra@centrum.cz>

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
*/

#include "pluginmanager.h"

#include <pybind11/pybind11.h>
#include <pybind11/stl.h> /* for pluginList() and aliasList() */
#include <Corrade/Containers/StringStl.h> /** @todo drop once we have our string casters */
#include <Corrade/Containers/StringIterable.h>
#include <Corrade/PluginManager/AbstractManager.h>
#include <Corrade/PluginManager/AbstractPlugin.h>
#include <Corrade/PluginManager/PluginMetadata.h>
#include <Corrade/Utility/ConfigurationGroup.h>

#include "Corrade/PythonBindings.h"

#include "corrade/bootstrap.h"
#include "corrade/EnumOperators.h"

namespace corrade {

void pluginmanager(py::module_& m) {
    m.doc() = "Plugin management";

    #ifndef CORRADE_BUILD_STATIC
    /* Need ConfigurationGroup from there. These are a part of the same module
       in the static build, no need to import (also can't import because there
       it's _corrade.*) */
    py::module_::import("corrade.utility");
    #endif

    py::enum_<PluginManager::LoadState> loadState{m, "LoadState", "Plugin load state"};
    loadState
        .value("NOT_FOUND", PluginManager::LoadState::NotFound)
        .value("WRONG_PLUGIN_VERSION", PluginManager::LoadState::WrongPluginVersion)
        .value("WRONG_INTERFACE_VERSION", PluginManager::LoadState::WrongInterfaceVersion)
        .value("WRONG_METADATA_FILE", PluginManager::LoadState::WrongMetadataFile)
        .value("UNRESOLVED_DEPENDENCY", PluginManager::LoadState::UnresolvedDependency)
        .value("STATIC", PluginManager::LoadState::Static)
        .value("LOADED", PluginManager::LoadState::Loaded)
        .value("NOT_LOADED", PluginManager::LoadState::NotLoaded)
        .value("UNLOAD_FAILED", PluginManager::LoadState::UnloadFailed)
        .value("REQUIRED", PluginManager::LoadState::Required)
        .value("USED", PluginManager::LoadState::Used);
    corrade::enumOperators(loadState);

    py::class_<PluginManager::PluginMetadata>{m, "PluginMetadata", "Plugin metadata"}
        .def_property_readonly("name", [](PluginManager::PluginMetadata& self) {
            /** @todo drop std::string in favor of our own string caster */
            return std::string{self.name()};
        }, "Plugin name")
        .def_property_readonly("depends", [](PluginManager::PluginMetadata& self) {
            /** @todo make a generic caster for arbitrary arrays and strings */
            std::vector<std::string> out;
            for(Containers::StringView i: self.depends())
                out.push_back(i);
            return out;
        }, "Plugins on which this plugin depends")
        .def_property_readonly("used_by", [](PluginManager::PluginMetadata& self) {
            /** @todo make a generic caster for arbitrary arrays and strings */
            std::vector<std::string> out;
            for(Containers::StringView i: self.usedBy())
                out.push_back(i);
            return out;
        }, "Plugins which depend on this plugin")
        .def_property_readonly("provides", [](PluginManager::PluginMetadata& self) {
            /** @todo make a generic caster for arbitrary arrays and strings */
            std::vector<std::string> out;
            for(Containers::StringView i: self.provides())
                out.push_back(i);
            return out;
        }, "Plugins which are provided by this plugin")
        /** @todo data? no plugin uses this at the moment */
        .def_property_readonly("configuration", static_cast<Utility::ConfigurationGroup&(PluginManager::PluginMetadata::*)()>(&PluginManager::PluginMetadata::configuration), "Initial plugin-specific configuration", py::return_value_policy::reference_internal);

    PyNonDestructibleClass<PluginManager::AbstractManager> manager{m, "AbstractManager", "Base for plugin managers"};
    manager.attr("VERSION") = PluginManager::AbstractManager::Version;
    manager
        .def_property_readonly("plugin_interface", [](PluginManager::AbstractManager& self) {
            /** @todo drop std::string in favor of our own string caster */
            return std::string{self.pluginInterface()};
        }, "Plugin interface string")
        .def_property("plugin_directory",
            /** @todo drop std::string in favor of our own string caster */
            [](PluginManager::AbstractManager& self) {
                return std::string{self.pluginDirectory()};
            }, [](PluginManager::AbstractManager& self, const std::string& directory) {
                self.setPluginDirectory(directory);
            }, "Plugin directory")
        .def("reload_plugin_directory", &PluginManager::AbstractManager::reloadPluginDirectory, "Reload plugin directory")
        .def("set_preferred_plugins", [](PluginManager::AbstractManager& self, const std::string& alias, const std::vector<std::string>& plugins) {
            if(self.loadState(alias) == PluginManager::LoadState::NotFound) {
                PyErr_SetNone(PyExc_KeyError);
                throw py::error_already_set{};
            }

            /** @todo drop all this once StringIterable can be a view on
                std::strings */
            Containers::Array<Containers::StringView> pluginViews{NoInit, plugins.size()};
            for(std::size_t i = 0; i != plugins.size(); ++i)
                pluginViews[i] = plugins[i];
            self.setPreferredPlugins(alias, pluginViews);
        }, "Set preferred plugins for given alias", py::arg("alias"), py::arg("plugins"))
        .def_property_readonly("plugin_list", [](PluginManager::AbstractManager& self) {
            /** @todo make a generic caster for arbitrary arrays and strings */
            std::vector<std::string> out;
            for(Containers::StringView i: self.pluginList())
                out.push_back(i);
            return out;
        }, "List of all available plugin names")
        .def_property_readonly("alias_list", [](PluginManager::AbstractManager& self) {
            /** @todo make a generic caster for arbitrary arrays and strings */
            std::vector<std::string> out;
            for(Containers::StringView i: self.aliasList())
                out.push_back(i);
            return out;
        }, "List of all available alias names")
        .def("metadata", [](PluginManager::AbstractManager& self, const std::string& plugin) {
            return self.metadata(plugin);
        }, "Plugin metadata", py::arg("plugin"), py::return_value_policy::reference_internal)
        /** @todo drop std::string in favor of our own string caster */
        .def("load_state", [](PluginManager::AbstractManager& self, const std::string& plugin) {
            return self.loadState(plugin);
        }, "Load state of a plugin", py::arg("plugin"))
        .def("load", [](PluginManager::AbstractManager& self, const std::string& plugin) {
            /** @todo log redirection -- but we'd need assertions to not be
                part of that so when it dies, the user can still see why */
            const PluginManager::LoadState state = self.load(plugin);
            if(!(state & PluginManager::LoadState::Loaded)) {
                PyErr_Format(PyExc_RuntimeError, "can't load plugin %s", plugin.data());
                throw py::error_already_set{};
            }

            return state;
        }, "Load a plugin", py::arg("plugin"))
        .def("unload", [](PluginManager::AbstractManager& self, const std::string& plugin) {
            /** @todo log redirection -- but we'd need assertions to not be
                part of that so when it dies, the user can still see why */
            const PluginManager::LoadState state = self.unload(plugin);
            if(state != PluginManager::LoadState::NotLoaded && state != PluginManager::LoadState::Static) {
                PyErr_Format(PyExc_RuntimeError, "can't unload plugin %s", plugin.data());
                throw py::error_already_set{};
            }

            return state;
        }, "Unload a plugin", py::arg("plugin"))
        .def("register_external_manager", &PluginManager::AbstractManager::registerExternalManager, "Register an external manager for resolving inter-manager dependencies", py::arg("manager"), py::keep_alive<1, 2>());

    py::class_<PluginManager::AbstractPlugin, PluginManager::PyPluginHolder<PluginManager::AbstractPlugin>>{m, "AbstractPlugin", "Base class for plugin interfaces"}
        /* Plugin interface string, search paths, suffix, metadata file suffix
           are meant to be overriden in subclasses */
        .def_property_readonly("plugin", [](PluginManager::AbstractPlugin& self) {
            /** @todo drop std::string in favor of our own string caster */
            return std::string{self.plugin()};
        }, "Plugin identifier string")
        .def_property_readonly("metadata", &PluginManager::AbstractPlugin::metadata, "Plugin metadata", py::return_value_policy::reference_internal)
        .def_property_readonly("configuration", static_cast<Utility::ConfigurationGroup&(PluginManager::AbstractPlugin::*)()>(&PluginManager::AbstractPlugin::configuration), "Plugin-specific configuration", py::return_value_policy::reference_internal);
}

}

#ifndef CORRADE_BUILD_STATIC
extern "C" PYBIND11_EXPORT PyObject* PyInit_pluginmanager();
PYBIND11_MODULE(pluginmanager, m) {
    corrade::pluginmanager(m);
}
#endif