udp_socket.hpp

#pragma once
#include <ossia/detail/logger.hpp>
#include <ossia/network/sockets/configuration.hpp>
 
#include <boost/asio/io_context.hpp>
#include <boost/asio/ip/udp.hpp>
#include <boost/asio/local/datagram_protocol.hpp>
#include <boost/asio/placeholders.hpp>
#include <boost/asio/strand.hpp>
#include <boost/asio/write.hpp>
 
#include <nano_signal_slot.hpp>
 
namespace ossia::net
{
 
class udp_receive_socket
{
  using proto = boost::asio::ip::udp;
 
public:
  udp_receive_socket(boost::asio::io_context& ctx)
      : m_context{ctx}
      , m_socket{boost::asio::make_strand(ctx)}
  {
  }
 
  udp_receive_socket(const socket_configuration& conf, boost::asio::io_context& ctx)
      : m_context{ctx}
      , m_endpoint{boost::asio::ip::make_address(conf.host), conf.port}
      , m_socket{boost::asio::make_strand(ctx)}
  {
  }
 
  ~udp_receive_socket() = default;
 
  void assign(int sock) { m_socket.assign(boost::asio::ip::udp::v4(), sock); }
  void open()
  {
    m_socket.open(boost::asio::ip::udp::v4());
    m_socket.bind(m_endpoint);
  }
 
  void close()
  {
    if(m_socket.is_open())
    {
      m_context.post([this] {
        m_socket.close();
        on_close();
      });
    }
  }
 
  template <typename F>
  void receive(F f)
  {
    m_socket.async_receive_from(
        boost::asio::mutable_buffer(&m_data[0], std::size(m_data)), m_endpoint,
        [this, f](auto ec, std::size_t sz) {
      if(ec == boost::asio::error::operation_aborted)
        return;
 
      if(!ec && sz > 0)
      {
        try
        {
          f(m_data, sz);
        }
        catch(const std::exception& e)
        {
          ossia::logger().error("[udp_socket::receive]: {}", e.what());
        }
        catch(...)
        {
          ossia::logger().error("[udp_socket::receive]: unknown error");
        }
      }
 
      this->receive(f);
        });
  }
 
  Nano::Signal<void()> on_close;
 
  boost::asio::io_context& m_context;
  proto::endpoint m_endpoint;
  proto::socket m_socket;
  alignas(16) char m_data[65535];
};
 
class udp_send_socket
{
  using proto = boost::asio::ip::udp;
 
public:
  udp_send_socket(const socket_configuration& conf, boost::asio::io_context& ctx)
      : m_context{ctx}
      , m_endpoint{conf.broadcast ? boost::asio::ip::address_v4::broadcast() : boost::asio::ip::make_address(conf.host), conf.port}
      , m_socket{boost::asio::make_strand(ctx)}
  {
  }
 
  udp_send_socket(
      const boost::asio::ip::address_v4& host, const uint16_t port,
      boost::asio::io_context& ctx)
      : m_context{ctx}
      , m_endpoint{host, port}
      , m_socket{boost::asio::make_strand(ctx)}
  {
  }
 
  void connect()
  {
    m_socket.open(boost::asio::ip::udp::v4());
 
    m_socket.set_option(boost::asio::ip::udp::socket::reuse_address(true));
 
    if(m_endpoint.address() == boost::asio::ip::address_v4::broadcast())
      m_socket.set_option(boost::asio::socket_base::broadcast(true));
  }
 
  void close()
  {
    if(m_socket.is_open())
    {
      m_context.post([this] {
        m_socket.close();
        on_close();
      });
    }
  }
 
  void write(const char* data, std::size_t sz)
  {
    boost::system::error_code ec;
    m_socket.send_to(boost::asio::const_buffer(data, sz), m_endpoint, 0, ec);
  }
 
  Nano::Signal<void()> on_close;
 
  boost::asio::io_context& m_context;
  proto::endpoint m_endpoint;
  proto::socket m_socket;
};
 
}