RemoteConfigCollector.hpp

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/*
    Copyright (C) 2014-2016 Leosac

    This file is part of Leosac.

    Leosac is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Leosac is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program. If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once

#include <boost/property_tree/ptree.hpp>
#include <map>
#include <memory>
#include <string>
#include <vector>
#include <zmqpp/zmqpp.hpp>

namespace Leosac
{
class RemoteConfigCollector
{
  public:
    RemoteConfigCollector(zmqpp::context_t &ctx, const std::string &remote_endpoint,
                          const std::string &remote_pk);
    virtual ~RemoteConfigCollector() = default;

    RemoteConfigCollector(const RemoteConfigCollector &) = delete;
    RemoteConfigCollector(RemoteConfigCollector &&)      = delete;
    RemoteConfigCollector &operator=(const RemoteConfigCollector &) = delete;
    RemoteConfigCollector &operator=(RemoteConfigCollector &&) = delete;

    using ModuleConfigMap = std::map<std::string, boost::property_tree::ptree>;

    using FileNameContentList = std::list<std::pair<std::string, std::string>>;
    using ModuleAdditionalFiles = std::map<std::string, FileNameContentList>;

    bool fetch_config(std::string *error_str) noexcept;

    const std::list<std::string> &modules_list() const noexcept;

    const ModuleConfigMap &modules_config() const noexcept;

    const boost::property_tree::ptree &module_config(const std::string &name) const;

    const boost::property_tree::ptree &general_config() const;

    const FileNameContentList &additional_files(const std::string module) const;

    uint64_t remote_version() const;

  private:
    bool fetch_general_config();

    bool fetch_module_list();

    bool fetch_module_config(const std::string &module_name);

    bool fetch_modules_config();

    bool fetch_remote_config_version(uint64_t &version);

    std::string remote_endpoint_;
    std::string remote_pk_;

    zmqpp::poller_t poller_;
    zmqpp::socket_t sock_;

    long mstimeout_;

    uint64_t remote_version_;

    ModuleConfigMap config_map_;
    boost::property_tree::ptree general_config_;
    std::list<std::string> module_list_;
    ModuleAdditionalFiles additional_files_;

    // those 2 boolean are here to enforce the correct use of the object.
    // Call fetch_config() then access various config item.

    bool first_call_;
    bool succeed_;
};
}