2 Copyright (C) 2020-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
22 #include "dcpomatic_log.h"
23 #include "exceptions.h"
25 #include <nanomsg/nn.h>
26 #include <nanomsg/pair.h>
31 using std::runtime_error;
33 using boost::optional;
36 #define NANOMSG_URL "ipc:///tmp/dcpomatic.ipc"
39 Nanomsg::Nanomsg (bool server)
41 _socket = nn_socket (AF_SP, NN_PAIR);
43 throw runtime_error("Could not set up nanomsg socket");
46 if ((_endpoint = nn_bind(_socket, NANOMSG_URL)) < 0) {
47 throw runtime_error(String::compose("Could not bind nanomsg socket (%1)", errno));
50 if ((_endpoint = nn_connect(_socket, NANOMSG_URL)) < 0) {
51 throw runtime_error(String::compose("Could not connect nanomsg socket (%1)", errno));
59 nn_shutdown (_socket, _endpoint);
65 Nanomsg::send (string s, int timeout)
68 nn_setsockopt (_socket, NN_SOL_SOCKET, NN_SNDTIMEO, &timeout, sizeof(int));
71 int const r = nn_send (_socket, s.c_str(), s.length(), timeout ? 0 : NN_DONTWAIT);
73 if (errno == ETIMEDOUT || errno == EAGAIN) {
76 throw runtime_error(String::compose("Could not send to nanomsg socket (%1)", errno));
77 } else if (r != int(s.length())) {
78 throw runtime_error("Could not send to nanomsg socket (message too big)");
86 Nanomsg::get_from_pending ()
88 if (_pending.empty()) {
92 auto const l = _pending.back();
99 Nanomsg::recv_and_parse (int flags)
102 int const received = nn_recv (_socket, &buf, NN_MSG, flags);
105 if (errno == ETIMEDOUT || errno == EAGAIN) {
109 LOG_DISK_NC("nn_recv failed");
110 throw CommunicationFailedError ();
114 for (int i = 0; i < received; ++i) {
116 _pending.push_front (_current);
128 Nanomsg::receive (int timeout)
131 nn_setsockopt (_socket, NN_SOL_SOCKET, NN_RCVTIMEO, &timeout, sizeof(int));
134 auto l = get_from_pending ();
139 recv_and_parse (timeout ? 0 : NN_DONTWAIT);
141 return get_from_pending ();