using boost asio to write to carbon gives broken pipe - c++

Question

I have Grafana and Graphite running on localhost. Everything is setup as default, so the plaintext protocol is configured for port 2003, as described here
The following works as desired:
export SERVER=localhost
export PORT=2003
echo "no_cluster.fake_xen.sample 25 1488542618" | nc ${SERVER} ${PORT}
Gives me the datapoint I expect (adjust timestamp as needed).
The following minimal compileable example:
#include <chrono>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
#include <boost/asio.hpp>
namespace basio = boost::asio;
void post_to_carbon (std::string message)
{
using btcp = boost::asio::ip::tcp;
constexpr const char* carbon_port="2003";
basio::io_service ios;
btcp::resolver resolver(ios);
btcp::resolver::query query("localhost", carbon_port);
btcp::endpoint carbon_endpoint = *resolver.resolve(query);
btcp::socket sock(ios,carbon_endpoint);
boost::system::error_code ignored_error;
basio::write(sock, basio::buffer(message), ignored_error);
std::cout << "posting: " << message << " gave: " << ignored_error.message() << "\n";
}
int main() {
post_to_carbon("no_cluster.fake_xen.sample 25 1488542800");
}
Fails with the error message:
posting: no_cluster.fake_xen.sample 25 1488542800 gave: Broken pipe
Can someone tell me what I'm doing wrong?

Answer 1

The constructor form socket(io_service, endpoint) binds the local endpoint of the socket to the given endpoint.
I think what you want to do is:
btcp::socket sock(ios);
sock.connect(carbon_endpoint /* , error_code */);