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// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef PERFDHCP_RECEIVER_H
#define PERFDHCP_RECEIVER_H
#include <perfdhcp/perf_socket.h>
#include <perfdhcp/command_options.h>
#include <dhcp/pkt.h>
#include <queue>
#include <thread>
#include <mutex>
#include <atomic>
namespace isc {
namespace perfdhcp {
/// \brief A receiving DHCP packets class.
///
/// Receiver can be used in two modes: single-thread and multi-thread.
///
/// In single-thread mode the class directly reads packets from socket
/// and returns them to consumer using getPkt method.
///
/// In case of multi-thread mode the class starts a thread in the background.
/// The thread reads the packets and pushes them to pkt_queue_. Then
/// in main thread packets can be consumed from the queue using getPkt
/// method.
class Receiver {
private:
/// \brief Flag indicating if thread should run (true) or not (false).
std::atomic_flag run_flag_;
/// \brief Thread for receiving packets.
std::unique_ptr<std::thread> recv_thread_;
/// \brief Queue for passing packets from receiver thread to main thread.
std::queue<dhcp::PktPtr> pkt_queue_;
/// \brief Mutex for controlling access to the queue.
std::mutex pkt_queue_mutex_;
BasePerfSocket &socket_;
/// \brief Single- or thread-mode indicator.
bool single_threaded_;
uint8_t ip_version_;
public:
/// \brief Receiver constructor.
///
/// \param socket A socket for receiving packets.
/// \param single_threaded A flag indicating running mode.
/// \param ip_version An IP version: 4 or 6
Receiver(BasePerfSocket &socket, bool single_threaded, uint8_t ip_version) :
socket_(socket),
single_threaded_(single_threaded),
ip_version_(ip_version) {
run_flag_.clear();
}
/// \brief Destructor.
~Receiver();
/// \brief Start a receiving thread in multi-thread mode.
///
/// In single-thread mode it does nothing.
void start();
/// \brief Stop a receiving thread in multi-thread mode.
///
/// In single-thread mode it does nothing.
void stop();
/// \brief Get DHCP packet.
///
/// In single-thread mode it reads directly from the socket.
/// In multi-thread mode it reads packets from the queue.
dhcp::PktPtr getPkt();
private:
/// \brief Receiving thread main function.
void run();
/// \brief Receive packets from sockets and pushes them to the queue.
///
/// It runs in a loop until socket is empty.
void receivePackets();
/// \brief Read a packet directly from the socket.
dhcp::PktPtr readPktFromSocket();
};
}
}
#endif /* PERFDHCP_RECEIVER_H */
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