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// Copyright Contributors to the DNF5 project.
// Copyright Contributors to the libdnf project.
// SPDX-License-Identifier: GPL-2.0-or-later
//
// This file is part of libdnf: https://github.com/rpm-software-management/libdnf/
//
// Libdnf is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// Libdnf 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with libdnf. If not, see <https://www.gnu.org/licenses/>.
#ifndef DNF5DAEMON_SERVER_THREADS_MANAGER_HPP
#define DNF5DAEMON_SERVER_THREADS_MANAGER_HPP
#include "dbus.hpp"
#include "utils.hpp"
#include <fmt/format.h>
#include <locale.h>
#include <sdbus-c++/sdbus-c++.h>
#include <atomic>
#include <iostream>
#include <mutex>
#include <optional>
#include <string>
#include <thread>
#include <vector>
class ThreadsManager {
public:
ThreadsManager();
virtual ~ThreadsManager();
void register_thread(std::thread && thread);
void mark_thread_finished(std::thread::id thread_id);
void current_thread_finished() { mark_thread_finished(std::this_thread::get_id()); };
void join_threads(const bool only_finished);
void finish();
template <class S, bool UseLibdnf5Mutex = true>
void handle_method(
S & service,
sdbus::MethodReply (S::*method)(sdbus::MethodCall &),
sdbus::MethodCall & call,
std::optional<std::string> thread_locale = std::nullopt) {
auto worker = std::thread(
[this](
S & service,
sdbus::MethodReply (S::*method)(sdbus::MethodCall &),
sdbus::MethodCall call,
std::optional<std::string> thread_locale = std::nullopt) {
locale_t new_locale{nullptr};
locale_t orig_locale{nullptr};
if (thread_locale) {
orig_locale = set_thread_locale(thread_locale.value(), new_locale);
}
sdbus::MethodReply reply;
try {
// Use template parameter to control libdnf5 mutex usage per method
// UseLibdnf5Mutex=true (default): Serialize D-Bus method calls that use libdnf5
// UseLibdnf5Mutex=false: Skip mutex for methods that don't need synchronization
std::optional<std::lock_guard<std::mutex>> libdnf5_lock;
if constexpr (UseLibdnf5Mutex) {
libdnf5_lock.emplace(service.get_session().get_libdnf5_mutex());
}
reply = (service.*method)(call);
} catch (const sdbus::Error & ex) {
reply = call.createErrorReply(ex);
} catch (const std::exception & ex) {
reply = call.createErrorReply(sdbus::Error(dnfdaemon::ERROR, ex.what()));
} catch (...) {
reply = call.createErrorReply(sdbus::Error(dnfdaemon::ERROR, "Unknown exception caught"));
}
bool success = false;
std::string error_msg;
try {
reply.send();
success = true;
} catch (const std::exception & e) {
error_msg = e.what();
} catch (...) {
error_msg = "Unknown exception caught";
}
if (!success) {
std::cerr << fmt::format(
"Error sending D-Bus reply to {}:{}() call: {}",
call.getInterfaceName(),
call.getMemberName(),
error_msg)
<< std::endl;
}
if (thread_locale) {
uselocale(orig_locale);
freelocale(new_locale);
}
current_thread_finished();
},
std::ref(service),
method,
call,
thread_locale);
register_thread(std::move(worker));
}
template <class S, bool UseLibdnf5Mutex = true>
void handle_method_fd(
S & service,
void (S::*method)(sdbus::MethodCall &, const std::string &),
sdbus::MethodCall & call,
std::optional<std::string> thread_locale = std::nullopt) {
auto worker = std::thread(
[this](
S & service,
void (S::*method)(sdbus::MethodCall &, const std::string &),
sdbus::MethodCall call,
std::optional<std::string> thread_locale = std::nullopt) {
static unsigned int counter{0};
locale_t new_locale{nullptr};
locale_t orig_locale{nullptr};
if (thread_locale) {
orig_locale = set_thread_locale(thread_locale.value(), new_locale);
}
sdbus::MethodReply reply = call.createReply();
// generate unique transfer id based on client bus name and counter
const std::string transfer_id = fmt::format("{}-{}", call.getSender(), ++counter);
reply << transfer_id;
std::string error_msg;
try {
reply.send();
} catch (const std::exception & e) {
error_msg = e.what();
} catch (...) {
error_msg = "Unknown exception caught";
}
if (error_msg.empty()) {
try {
// Use template parameter to control libdnf5 mutex usage per method
// UseLibdnf5Mutex=true (default): Serialize D-Bus method calls that use libdnf5
// UseLibdnf5Mutex=false: Skip mutex for methods that don't need synchronization
std::optional<std::lock_guard<std::mutex>> libdnf5_lock;
if constexpr (UseLibdnf5Mutex) {
libdnf5_lock.emplace(service.get_session().get_libdnf5_mutex());
}
(service.*method)(call, transfer_id);
} catch (...) {
// TODO(mblaha): log the error
}
} else {
std::cerr << fmt::format(
"Error sending D-Bus reply to {}:{}() call: {}",
call.getInterfaceName(),
call.getMemberName(),
error_msg)
<< std::endl;
}
if (thread_locale) {
uselocale(orig_locale);
freelocale(new_locale);
}
current_thread_finished();
},
std::ref(service),
method,
call,
thread_locale);
register_thread(std::move(worker));
}
template <class S>
void handle_signal(S & service, void (S::*method)(sdbus::Signal &), sdbus::Signal & signal) {
auto worker = std::thread(
[this](S & service, void (S::*method)(sdbus::Signal &), sdbus::Signal signal) {
bool success = false;
std::string error_msg;
try {
(service.*method)(signal);
success = true;
} catch (const std::exception & ex) {
error_msg = ex.what();
} catch (...) {
error_msg = "Unknown exception caught";
}
if (!success) {
std::cerr << fmt::format(
"Error handling signal {}:{}: {}",
signal.getInterfaceName(),
signal.getMemberName(),
error_msg)
<< std::endl;
}
current_thread_finished();
},
std::ref(service),
method,
signal);
register_thread(std::move(worker));
}
private:
std::mutex running_threads_mutex;
// flag whether to break the finished threads collector infinite loop
std::atomic<bool> finish_collector{false};
// thread that joins finished worker threads
std::thread running_threads_collector;
// vector of started worker threads
std::vector<std::thread> running_threads{};
// vector of finished threads id
std::vector<std::thread::id> finished_threads{};
static locale_t set_thread_locale(const std::string & thread_locale, locale_t & new_locale);
};
#endif
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