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tcp_socket.cpp
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tcp_socket.cpp
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#include "tcp_socket.hpp"
// std
#include <cstring>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <unistd.h>
#include <array>
#include <iostream>
#include <stdexcept>
// local
#include "exception_builder.hpp"
// impl
class tcp_socket::impl
{
public:
int socket_fd = -1;
impl(int sfd)
: socket_fd(sfd)
{}
impl(const std::string& address, uint16_t port)
{
// setup hints
addrinfo hints;
memset(&hints, 0, sizeof(addrinfo));
hints.ai_family = AF_UNSPEC; // IPv4 or v6
hints.ai_socktype = SOCK_STREAM; // TCP
hints.ai_flags = 0;
hints.ai_protocol = 0; // any protocol
// get possible resolved addresses
addrinfo* result;
int s = getaddrinfo(address.c_str(), std::to_string(port).c_str(),
&hints,
&result);
if (s != 0)
exception_builder<std::runtime_error>() << "getaddrinfo failed: " << gai_strerror(s);
// iterate over results until we successfully open a socket and connect
for ( auto* r = result; r != nullptr; r = r->ai_next )
{
int sfd = ::socket(r->ai_family, r->ai_socktype, r->ai_protocol);
if (sfd == -1)
continue;
if (connect(sfd, r->ai_addr, r->ai_addrlen) != -1)
{
// success; stash sfd
socket_fd = sfd;
break;
}
close(sfd);
}
if (!result)
exception_builder<std::runtime_error>() << "failed to resolve address for: "
<< address << ":" << port;
// clean up the result from getaddrinfo
freeaddrinfo(result);
}
~impl()
{
if (socket_fd != -1)
{
::close(socket_fd);
socket_fd = -1;
}
}
};
tcp_socket::tcp_socket(int socket_fd)
: _impl(new impl(socket_fd))
{}
tcp_socket::tcp_socket(const std::string& address, uint16_t port)
: _impl(new impl(address, port))
{}
tcp_socket::~tcp_socket() = default;
tcp_socket::tcp_socket(tcp_socket&&) = default;
tcp_socket& tcp_socket::operator=(tcp_socket&&) = default;
std::string tcp_socket::read()
{
std::string result;
std::array<char, 1024> buffer = {};
while (true)
{
int bytes_read = ::read(_impl->socket_fd, buffer.data(), buffer.size());
if (bytes_read<0)
exception_builder<std::runtime_error>() << "failed to read: " << strerror(errno);
result += buffer.data();
if (bytes_read < (int)buffer.size())
break;
}
return result;
}
bool tcp_socket::write(const std::string& s)
{
if ( _impl->socket_fd == -1 )
return false;
auto written = ::send(_impl->socket_fd, s.c_str(), s.size(), MSG_NOSIGNAL);
if (written < 0)
return false;
if (written != (int)s.size())
return false;
return true;
}