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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
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