presence_manager.h

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/*
 * Copyright (C) 2004-2026 Savoir-faire Linux Inc.
 *
 * This program 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include <opendht/dhtrunner.h>
#include <opendht/infohash.h>
 
#include <map>
#include <set>
#include <mutex>
#include <string>
#include <functional>
#include <vector>
#include <future>
#include <atomic>
 
namespace jami {
 
class PresenceManager
{
public:
    using PresenceCallback = std::function<void(const std::string& uri, bool online)>;
    using DevicePresenceCallback = std::function<void(const std::string& uri, const dht::PkId& deviceId, bool online)>;
 
    PresenceManager(const std::shared_ptr<dht::DhtRunner>& dht);
    ~PresenceManager();
 
    void trackBuddy(const std::string& uri);
 
    void untrackBuddy(const std::string& uri);
 
    bool isOnline(const std::string& uri) const;
 
    std::map<std::string, bool> getTrackedBuddyPresence() const;
 
    std::vector<dht::PkId> getDevices(const std::string& uri) const;
 
    uint64_t addListener(PresenceCallback cb);
 
    void removeListener(uint64_t token);
 
    uint64_t addDeviceListener(DevicePresenceCallback cb);
 
    void removeDeviceListener(uint64_t token);
 
    void refresh();
 
private:
    struct TrackedBuddy
    {
        dht::InfoHash id;
        std::set<dht::PkId> devices;
        std::future<size_t> listenToken;
        int refCount {0};
 
        TrackedBuddy(dht::InfoHash h)
            : id(h)
        {}
    };
 
    void trackPresence(const dht::InfoHash& h, TrackedBuddy& buddy);
    void notifyListeners(const std::string& uri, bool online);
    void notifyDeviceListeners(const std::string& uri, const dht::PkId& deviceId, bool online);
 
    std::shared_ptr<dht::DhtRunner> dht_;
 
    mutable std::mutex mutex_;
    std::map<dht::InfoHash, TrackedBuddy> trackedBuddies_;
 
    std::mutex listenersMutex_;
    std::map<uint64_t, PresenceCallback> listeners_;
    std::map<uint64_t, DevicePresenceCallback> deviceListeners_;
    std::atomic_uint64_t nextListenerId_ {1};
};
 
} // namespace jami