mirror of
https://github.com/laomms/wxhelper.git
synced 2024-12-23 12:59:22 +08:00
128 lines
3.8 KiB
C++
128 lines
3.8 KiB
C++
// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
|
|
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
|
|
|
|
#pragma once
|
|
|
|
#ifdef _WIN32
|
|
#error include tcp_client-windows.h instead
|
|
#endif
|
|
|
|
// tcp client helper
|
|
#include <spdlog/common.h>
|
|
#include <spdlog/details/os.h>
|
|
|
|
#include <arpa/inet.h>
|
|
#include <netdb.h>
|
|
#include <netinet/in.h>
|
|
#include <netinet/tcp.h>
|
|
#include <sys/socket.h>
|
|
#include <unistd.h>
|
|
|
|
#include <string>
|
|
|
|
namespace spdlog {
|
|
namespace details {
|
|
class tcp_client {
|
|
int socket_ = -1;
|
|
|
|
public:
|
|
bool is_connected() const { return socket_ != -1; }
|
|
|
|
void close() {
|
|
if (is_connected()) {
|
|
::close(socket_);
|
|
socket_ = -1;
|
|
}
|
|
}
|
|
|
|
int fd() const { return socket_; }
|
|
|
|
~tcp_client() { close(); }
|
|
|
|
// try to connect or throw on failure
|
|
void connect(const std::string &host, int port) {
|
|
close();
|
|
struct addrinfo hints {};
|
|
memset(&hints, 0, sizeof(struct addrinfo));
|
|
hints.ai_family = AF_UNSPEC; // To work with IPv4, IPv6, and so on
|
|
hints.ai_socktype = SOCK_STREAM; // TCP
|
|
hints.ai_flags = AI_NUMERICSERV; // port passed as as numeric value
|
|
hints.ai_protocol = 0;
|
|
|
|
auto port_str = std::to_string(port);
|
|
struct addrinfo *addrinfo_result;
|
|
auto rv = ::getaddrinfo(host.c_str(), port_str.c_str(), &hints, &addrinfo_result);
|
|
if (rv != 0) {
|
|
throw_spdlog_ex(fmt_lib::format("::getaddrinfo failed: {}", gai_strerror(rv)));
|
|
}
|
|
|
|
// Try each address until we successfully connect(2).
|
|
int last_errno = 0;
|
|
for (auto *rp = addrinfo_result; rp != nullptr; rp = rp->ai_next) {
|
|
#if defined(SOCK_CLOEXEC)
|
|
const int flags = SOCK_CLOEXEC;
|
|
#else
|
|
const int flags = 0;
|
|
#endif
|
|
socket_ = ::socket(rp->ai_family, rp->ai_socktype | flags, rp->ai_protocol);
|
|
if (socket_ == -1) {
|
|
last_errno = errno;
|
|
continue;
|
|
}
|
|
rv = ::connect(socket_, rp->ai_addr, rp->ai_addrlen);
|
|
if (rv == 0) {
|
|
break;
|
|
}
|
|
last_errno = errno;
|
|
::close(socket_);
|
|
socket_ = -1;
|
|
}
|
|
::freeaddrinfo(addrinfo_result);
|
|
if (socket_ == -1) {
|
|
throw_spdlog_ex("::connect failed", last_errno);
|
|
}
|
|
|
|
// set TCP_NODELAY
|
|
int enable_flag = 1;
|
|
::setsockopt(socket_, IPPROTO_TCP, TCP_NODELAY, reinterpret_cast<char *>(&enable_flag),
|
|
sizeof(enable_flag));
|
|
|
|
// prevent sigpipe on systems where MSG_NOSIGNAL is not available
|
|
#if defined(SO_NOSIGPIPE) && !defined(MSG_NOSIGNAL)
|
|
::setsockopt(socket_, SOL_SOCKET, SO_NOSIGPIPE, reinterpret_cast<char *>(&enable_flag),
|
|
sizeof(enable_flag));
|
|
#endif
|
|
|
|
#if !defined(SO_NOSIGPIPE) && !defined(MSG_NOSIGNAL)
|
|
#error "tcp_sink would raise SIGPIPE since neither SO_NOSIGPIPE nor MSG_NOSIGNAL are available"
|
|
#endif
|
|
}
|
|
|
|
// Send exactly n_bytes of the given data.
|
|
// On error close the connection and throw.
|
|
void send(const char *data, size_t n_bytes) {
|
|
size_t bytes_sent = 0;
|
|
while (bytes_sent < n_bytes) {
|
|
#if defined(MSG_NOSIGNAL)
|
|
const int send_flags = MSG_NOSIGNAL;
|
|
#else
|
|
const int send_flags = 0;
|
|
#endif
|
|
auto write_result =
|
|
::send(socket_, data + bytes_sent, n_bytes - bytes_sent, send_flags);
|
|
if (write_result < 0) {
|
|
close();
|
|
throw_spdlog_ex("write(2) failed", errno);
|
|
}
|
|
|
|
if (write_result == 0) // (probably should not happen but in any case..)
|
|
{
|
|
break;
|
|
}
|
|
bytes_sent += static_cast<size_t>(write_result);
|
|
}
|
|
}
|
|
};
|
|
} // namespace details
|
|
} // namespace spdlog
|