0
|
1 |
/**
|
|
2 |
* Relational pipes
|
|
3 |
* Copyright © 2022 František Kučera (Frantovo.cz, GlobalCode.info)
|
|
4 |
*
|
|
5 |
* This program is free software: you can redistribute it and/or modify
|
|
6 |
* it under the terms of the GNU General Public License as published by
|
|
7 |
* the Free Software Foundation, version 3 of the License.
|
|
8 |
*
|
|
9 |
* This program is distributed in the hope that it will be useful,
|
|
10 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
11 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
12 |
* GNU General Public License for more details.
|
|
13 |
*
|
|
14 |
* You should have received a copy of the GNU General Public License
|
|
15 |
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
16 |
*/
|
|
17 |
#pragma once
|
|
18 |
|
|
19 |
#include <mqueue.h>
|
|
20 |
#include <string>
|
|
21 |
#include <stdexcept>
|
|
22 |
#include <cstring>
|
|
23 |
|
|
24 |
namespace relpipe {
|
|
25 |
namespace out {
|
|
26 |
namespace zeromq {
|
|
27 |
|
|
28 |
class ZeroMQ {
|
|
29 |
private:
|
|
30 |
const static size_t MSG_SIZE = 8192; // TODO: configurable/dynamic
|
|
31 |
std::string queueName;
|
|
32 |
mqd_t handle = -2;
|
|
33 |
bool unlinkOnClose = false;
|
|
34 |
|
|
35 |
ZeroMQ(std::string queueName, mqd_t handle, bool unlinkOnClose) : queueName(queueName), handle(handle), unlinkOnClose(unlinkOnClose) {
|
|
36 |
}
|
|
37 |
|
|
38 |
public:
|
|
39 |
|
|
40 |
virtual ~ZeroMQ() {
|
|
41 |
if (handle >= 0) mq_close(handle);
|
|
42 |
if (unlinkOnClose) mq_unlink(queueName.c_str());
|
|
43 |
}
|
|
44 |
|
|
45 |
static ZeroMQ* open(std::string queueName, bool unlinkOnClose = false) {
|
|
46 |
mqd_t handle = mq_open(queueName.c_str(), O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
|
|
47 |
if (handle >= 0) return new ZeroMQ(queueName, handle, unlinkOnClose);
|
|
48 |
else throw std::logic_error("Unable to open ZeroMQ: " + queueName + " error: " + strerror(errno));
|
|
49 |
}
|
|
50 |
|
|
51 |
void send(std::string message) {
|
|
52 |
int result = mq_send(handle, message.c_str(), message.size(), 0);
|
|
53 |
if (result) throw std::logic_error("Unable to send message to" + queueName + " error: " + strerror(errno));
|
|
54 |
}
|
|
55 |
|
|
56 |
std::string receive() {
|
|
57 |
char buffer[MSG_SIZE + 1];
|
|
58 |
memset(buffer, 0, MSG_SIZE + 1);
|
|
59 |
ssize_t msgSize = mq_receive(handle, buffer, MSG_SIZE, nullptr);
|
|
60 |
|
|
61 |
if (msgSize > sizeof (buffer))throw std::logic_error("Invalid ZeroMQ message size.");
|
|
62 |
else if (msgSize >= 0) return std::string(buffer, msgSize);
|
|
63 |
else throw std::logic_error("Unable to receive ZeroMQ message from " + queueName + " error: " + strerror(errno));
|
|
64 |
}
|
|
65 |
|
|
66 |
};
|
|
67 |
|
|
68 |
}
|
|
69 |
}
|
|
70 |
}
|