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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <hicn/transport/interfaces/global_conf_interface.h>
#include <hicn/transport/utils/singleton.h>
#include <functional>
#include <map>
#include <memory>
#include <mutex>
#include <system_error>
namespace libconfig {
class Setting;
}
namespace transport {
namespace core {
/**
* Class holding workflow for global configuration.
* This class does not contains the actual configuration, which is rather stored
* inside the modules to be configured. This class contains the handlers to call
* for getting/setting the configurations and to parse the corresponding
* sections of the configuration file. Each class register 3 callbacks: one to
* parse conf section and 2 to set/get the configuration through programming
* interface.
*/
class GlobalConfiguration : public utils::Singleton<GlobalConfiguration> {
static const constexpr char *conf_file = "TRANSPORT_CONFIG";
friend class utils::Singleton<GlobalConfiguration>;
public:
/**
* This callback will be called by GlobalConfiguration in
*
*/
using ParserCallback = std::function<void(const libconfig::Setting &config,
std::error_code &ec)>;
using GetCallback =
std::function<void(interface::global_config::ConfigurationObject &object,
std::error_code &ec)>;
using SetCallback = std::function<void(
const interface::global_config::ConfigurationObject &object,
std::error_code &ec)>;
~GlobalConfiguration() = default;
public:
void parseConfiguration(const std::string &path);
void registerConfigurationParser(const std::string &key,
const ParserCallback &parser);
void registerConfigurationSetter(const std::string &key,
const SetCallback &set_callback);
void registerConfigurationGetter(const std::string &key,
const GetCallback &get_callback);
void unregisterConfigurationParser(const std::string &key);
void unregisterConfigurationSetter(const std::string &key);
void unregisterConfigurationGetter(const std::string &key);
void getConfiguration(
interface::global_config::ConfigurationObject &configuration_object,
std::error_code &ec);
void setConfiguration(
const interface::global_config::ConfigurationObject &configuration_object,
std::error_code &ec);
private:
GlobalConfiguration();
std::string conf_file_path_;
bool parseTransportConfig(const std::string &path);
private:
std::mutex cp_mtx_;
using ParserPair = std::pair<bool, ParserCallback>;
std::map<std::string, ParserPair> configuration_parsers_;
std::map<std::string, GetCallback> configuration_getters_;
std::map<std::string, SetCallback> configuration_setters_;
};
} // namespace core
} // namespace transport
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