udp_client.h

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// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
 
#pragma once
 
// Helper RAII over unix udp client socket.
// Will throw on construction if the socket creation failed.
 
#ifdef _WIN32
#    error "include udp_client-windows.h instead"
#endif
 
#include <spdlog/common.h>
#include <spdlog/details/os.h>
 
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>
#include <netinet/udp.h>
 
#include <string>
 
namespace spdlog {
namespace details {
 
class udp_client
{
    static constexpr int TX_BUFFER_SIZE = 1024 * 10;
    int socket_ = -1;
    struct sockaddr_in sockAddr_;
 
    void cleanup_()
    {
        if (socket_ != -1)
        {
            ::close(socket_);
            socket_ = -1;
        }
    }
 
public:
    udp_client(const std::string &host, uint16_t port)
    {
        socket_ = ::socket(PF_INET, SOCK_DGRAM, 0);
        if (socket_ < 0)
        {
            throw_spdlog_ex("error: Create Socket Failed!");
        }
 
        int option_value = TX_BUFFER_SIZE;
        if (::setsockopt(socket_, SOL_SOCKET, SO_SNDBUF, reinterpret_cast<const char *>(&option_value), sizeof(option_value)) < 0)
        {
            cleanup_();
            throw_spdlog_ex("error: setsockopt(SO_SNDBUF) Failed!");
        }
 
        sockAddr_.sin_family = AF_INET;
        sockAddr_.sin_port = htons(port);
 
        if (::inet_aton(host.c_str(), &sockAddr_.sin_addr) == 0)
        {
            cleanup_();
            throw_spdlog_ex("error: Invalid address!");
        }
 
        ::memset(sockAddr_.sin_zero, 0x00, sizeof(sockAddr_.sin_zero));
    }
 
    ~udp_client()
    {
        cleanup_();
    }
 
    int fd() const
    {
        return socket_;
    }
 
    // Send exactly n_bytes of the given data.
    // On error close the connection and throw.
    void send(const char *data, size_t n_bytes)
    {
        ssize_t toslen = 0;
        socklen_t tolen = sizeof(struct sockaddr);
        if ((toslen = ::sendto(socket_, data, n_bytes, 0, (struct sockaddr *)&sockAddr_, tolen)) == -1)
        {
            throw_spdlog_ex("sendto(2) failed", errno);
        }
    }
};
} // namespace details
} // namespace spdlog