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/*
Copyright (C) 2020 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "nanomsg.h"
#include "dcpomatic_log.h"
#include "exceptions.h"
#include <nanomsg/nn.h>
#include <nanomsg/pair.h>
#include <stdexcept>
#include <cerrno>
using std::string;
using std::runtime_error;
using boost::optional;
#define NANOMSG_URL "ipc:///tmp/dcpomatic.ipc"
Nanomsg::Nanomsg (bool server)
{
_socket = nn_socket (AF_SP, NN_PAIR);
if (_socket < 0) {
throw runtime_error("Could not set up nanomsg socket");
}
if (server) {
if (nn_bind(_socket, NANOMSG_URL) < 0) {
throw runtime_error(String::compose("Could not bind nanomsg socket (%1)", errno));
}
} else {
if (nn_connect(_socket, NANOMSG_URL) < 0) {
throw runtime_error(String::compose("Could not connect nanomsg socket (%1)", errno));
}
}
}
bool
Nanomsg::send (string s, int timeout)
{
if (timeout != 0) {
nn_setsockopt (_socket, NN_SOL_SOCKET, NN_SNDTIMEO, &timeout, sizeof(int));
}
int const r = nn_send (_socket, s.c_str(), s.length(), timeout ? 0 : NN_DONTWAIT);
if (r < 0) {
if (errno == ETIMEDOUT || errno == EAGAIN) {
return false;
}
throw runtime_error(String::compose("Could not send to nanomsg socket (%1)", errno));
} else if (r != int(s.length())) {
throw runtime_error("Could not send to nanomsg socket (message too big)");
}
return true;
}
optional<string>
Nanomsg::get_from_pending ()
{
if (_pending.empty()) {
return optional<string>();
}
string const l = _pending.back();
_pending.pop_back();
return l;
}
void
Nanomsg::recv_and_parse (int flags)
{
char* buf = 0;
int const received = nn_recv (_socket, &buf, NN_MSG, flags);
if (received < 0)
{
if (errno == ETIMEDOUT || errno == EAGAIN) {
return;
}
throw CommunicationFailedError ();
}
char* p = buf;
for (int i = 0; i < received; ++i) {
if (*p == '\n') {
_pending.push_front (_current);
_current = "";
} else {
_current += *p;
}
++p;
}
nn_freemsg (buf);
}
optional<string>
Nanomsg::receive (int timeout)
{
if (timeout != 0) {
nn_setsockopt (_socket, NN_SOL_SOCKET, NN_RCVTIMEO, &timeout, sizeof(int));
}
optional<string> l = get_from_pending ();
if (l) {
return *l;
}
recv_and_parse (timeout ? 0 : NN_DONTWAIT);
return get_from_pending ();
}
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