qmqtt_routesubscription.cpp
4.01 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
/* ****************************************************************************
* Copyright 2019 Open Systems Development BV *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the "Software"), *
* to deal in the Software without restriction, including without limitation *
* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
* and/or sell copies of the Software, and to permit persons to whom the *
* Software is furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included in *
* all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
* DEALINGS IN THE SOFTWARE. *
* ***************************************************************************/
#include "qmqtt_routesubscription.h"
#include "qmqtt_router.h"
#include "qmqtt_client.h"
#include "qmqtt_routedmessage.h"
#include <QLoggingCategory>
#include <QLatin1String>
#include <QLatin1Char>
#include <QRegularExpressionMatch>
#include <QStringList>
namespace QMQTT {
Q_LOGGING_CATEGORY(routerSubscription, "qmqtt.routersubscription")
RouteSubscription::RouteSubscription(Router *parent)
: QObject(parent),
_client(parent->client())
{
Q_ASSERT(!_client.isNull());
}
RouteSubscription::~RouteSubscription()
{
if (Q_LIKELY(!_client.isNull() && _client->isConnectedToHost()))
_client->unsubscribe(_topic);
}
QString RouteSubscription::route() const
{
return _topic;
}
void RouteSubscription::setRoute(const QString &route)
{
QRegularExpression parameterNamesRegExp(QStringLiteral("\\:([a-zA-Z0-9]+)")); // note how names must not contain dashes or underscores
// Remove paramter names to get the actual topic "route"
QString topic = route;
topic.remove(parameterNamesRegExp);
// Remove the MQTT wildcards to get a regular expression, which matches the parameters
QString parameterRegExp = route;
parameterRegExp
.remove(QLatin1Char('+'))
.replace(parameterNamesRegExp, QStringLiteral("([a-zA-Z0-9_-]+)")) // note how parameter values may contain dashes or underscores
.remove(QLatin1Char('#'))
.replace(QLatin1String("$"), QLatin1String("\\$"));
// Extract the parameter names
QRegularExpressionMatchIterator it = parameterNamesRegExp.globalMatch(route);
QStringList names;
while(it.hasNext()) {
QRegularExpressionMatch match = it.next();
QString parameterName = match.captured(1);
names << parameterName;
}
_topic = topic;
_parameterNames = names;
_regularExpression = QRegularExpression(parameterRegExp);
}
void RouteSubscription::routeMessage(const Message &message)
{
QString topic = message.topic();
QRegularExpressionMatch match = _regularExpression.match(topic);
if(!match.hasMatch()) {
return;
}
RoutedMessage routedMessage(message);
for(int i = 0, c = _parameterNames.size(); i < c; ++i) {
QString name = _parameterNames.at(i);
QString value = match.captured(i + 1);
routedMessage._parameters.insert(name, value);
}
emit received(routedMessage);
}
} // namespace QMQTT