multiplexed_socket.h

/*
 *  Copyright (C) 2017-2019 Savoir-faire Linux Inc.
 *  Author: Sébastien Blin <sebastien.blin@savoirfairelinux.com>
 *
 *  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/default_types.h>

#include "generic_io.h"
#include <condition_variable>

namespace jami {

class IceTransport;
class ChannelSocket;
class TlsSocketEndpoint;

using DeviceId = dht::PkId;
using OnConnectionRequestCb
    = std::function<bool(const std::shared_ptr<dht::crypto::Certificate>& /* peer */,
                         const uint16_t& /* id */,
                         const std::string& /* name */)>;
using OnConnectionReadyCb
    = std::function<void(const DeviceId& /* deviceId */, const std::shared_ptr<ChannelSocket>&)>;
using ChannelReadyCb = std::function<void(void)>;
using OnShutdownCb = std::function<void(void)>;

static constexpr auto SEND_BEACON_TIMEOUT = std::chrono::milliseconds(3000);
static constexpr uint16_t CONTROL_CHANNEL {0};
static constexpr uint16_t PROTOCOL_CHANNEL {0xffff};

enum class ChannelRequestState {
    REQUEST,
    ACCEPT,
    DECLINE,
};

/**
 * That msgpack structure is used to request a new channel (id, name)
 * Transmitted over the TLS socket
 */
struct ChannelRequest
{
    std::string name {};
    uint16_t channel {0};
    ChannelRequestState state {ChannelRequestState::REQUEST};
    MSGPACK_DEFINE(name, channel, state)
};

/**
 * A socket divided in channels over a TLS session
 */
class MultiplexedSocket : public std::enable_shared_from_this<MultiplexedSocket>
{
public:
    MultiplexedSocket(const DeviceId& deviceId, std::unique_ptr<TlsSocketEndpoint> endpoint);
    ~MultiplexedSocket();