zmq.h

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// Copyright (c) 2019, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
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//    used to endorse or promote products derived from this software without specific
//    prior written permission.
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#include <memory>
#include <string>
#include <system_error>
#include <zmq.h>
 
#include "common/expect.h"
#include "span.h"
 
#define ELECTRONEUM_ZMQ_CHECK(...)                      \
    do                                             \
    {                                              \
        if (( __VA_ARGS__ ) < 0)                   \
            return {::net::zmq::get_error_code()}; \
    } while (0)
 
#define ELECTRONEUM_LOG_ZMQ_ERROR(...)                                                   \
    do                                                                          \
    {                                                                           \
        MERROR( __VA_ARGS__ << ": " << ::net::zmq::get_error_code().message()); \
    } while (0)
 
#define ELECTRONEUM_ZMQ_THROW(msg)                         \
    ELECTRONEUM_THROW( ::net::zmq::get_error_code(), msg )
 
namespace net
{
    namespace zmq
    {
        const std::error_category& error_category() noexcept;
 
        inline std::error_code make_error_code(int code) noexcept
        {
          return std::error_code{code, error_category()};
        }
 
        inline std::error_code get_error_code() noexcept
        {
          return make_error_code(zmq_errno());
        }
 
        class terminate
        {
            static void call(void* ptr) noexcept;
        public:
            void operator()(void* ptr) const noexcept
            {
              if (ptr)
                call(ptr);
            }
        };
 
        struct close
        {
            void operator()(void* ptr) const noexcept
            {
              if (ptr)
                zmq_close(ptr);
            }
        };
 
        using context = std::unique_ptr<void, terminate>;
 
        using socket = std::unique_ptr<void, close>;
 
        expect<std::string> receive(void* socket, int flags = 0);
 
        expect<void> send(epee::span<const std::uint8_t> payload, void* socket, int flags = 0) noexcept;
    } // zmq
} // net