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juce_NetworkServiceDiscovery.cpp
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2017 - ROLI Ltd.
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23 namespace juce
24{
25
26#if JUCE_ANDROID
27 extern void acquireMulticastLock();
28 extern void releaseMulticastLock();
29#endif
30
31 NetworkServiceDiscovery::Advertiser::Advertiser (const String& serviceTypeUID,
32 const String& serviceDescription,
33 int broadcastPortToUse, int connectionPort,
34 RelativeTime minTimeBetweenBroadcasts)
35 : Thread ("Discovery_broadcast"),
36 message (serviceTypeUID), broadcastPort (broadcastPortToUse),
37 minInterval (minTimeBetweenBroadcasts)
38{
39 message.setAttribute ("id", Uuid().toString());
40 message.setAttribute ("name", serviceDescription);
41 message.setAttribute ("address", String());
42 message.setAttribute ("port", connectionPort);
43
44 startThread (2);
45}
46
47 NetworkServiceDiscovery::Advertiser::~Advertiser()
48{
49 stopThread (2000);
50 socket.shutdown();
51}
52
53 void NetworkServiceDiscovery::Advertiser::run()
54{
55 if (! socket.bindToPort (0))
56 {
57 jassertfalse;
58 return;
59 }
60
61 while (! threadShouldExit())
62 {
63 sendBroadcast();
64 wait ((int) minInterval.inMilliseconds());
65 }
66}
67
68 void NetworkServiceDiscovery::Advertiser::sendBroadcast()
69{
70 auto localAddress = IPAddress::getLocalAddress();
71 message.setAttribute ("address", localAddress.toString());
72 auto broadcastAddress = IPAddress::getInterfaceBroadcastAddress (localAddress);
73 auto data = message.toString (XmlElement::TextFormat().singleLine().withoutHeader());
74 socket.write (broadcastAddress.toString(), broadcastPort, data.toRawUTF8(), (int) data.getNumBytesAsUTF8());
75}
76
77//==============================================================================
78 NetworkServiceDiscovery::AvailableServiceList::AvailableServiceList (const String& serviceType, int broadcastPort)
79 : Thread ("Discovery_listen"), serviceTypeUID (serviceType)
80{
81 #if JUCE_ANDROID
82 acquireMulticastLock();
83 #endif
84
85 socket.bindToPort (broadcastPort);
86 startThread (2);
87}
88
89 NetworkServiceDiscovery::AvailableServiceList::~AvailableServiceList()
90{
91 socket.shutdown();
92 stopThread (2000);
93
94 #if JUCE_ANDROID
95 releaseMulticastLock();
96 #endif
97}
98
99 void NetworkServiceDiscovery::AvailableServiceList::run()
100{
101 while (! threadShouldExit())
102 {
103 if (socket.waitUntilReady (true, 200) == 1)
104 {
105 char buffer[1024];
106 auto bytesRead = socket.read (buffer, sizeof (buffer) - 1, false);
107
108 if (bytesRead > 10)
109 if (auto xml = parseXML (String (CharPointer_UTF8 (buffer),
110 CharPointer_UTF8 (buffer + bytesRead))))
111 if (xml->hasTagName (serviceTypeUID))
112 handleMessage (*xml);
113 }
114
115 removeTimedOutServices();
116 }
117}
118
119std::vector<NetworkServiceDiscovery::Service> NetworkServiceDiscovery::AvailableServiceList::getServices() const
120{
121 const ScopedLock sl (listLock);
122 auto listCopy = services;
123 return listCopy;
124}
125
126 void NetworkServiceDiscovery::AvailableServiceList::handleAsyncUpdate()
127{
128 if (onChange != nullptr)
129 onChange();
130}
131
132 void NetworkServiceDiscovery::AvailableServiceList::handleMessage (const XmlElement& xml)
133{
134 Service service;
135 service.instanceID = xml.getStringAttribute ("id");
136
137 if (service.instanceID.trim().isNotEmpty())
138 {
139 service.description = xml.getStringAttribute ("name");
140 service.address = IPAddress (xml.getStringAttribute ("address"));
141 service.port = xml.getIntAttribute ("port");
142 service.lastSeen = Time::getCurrentTime();
143
144 handleMessage (service);
145 }
146}
147
148 static void sortServiceList (std::vector<NetworkServiceDiscovery::Service>& services)
149{
150 auto compareServices = [] (const NetworkServiceDiscovery::Service& s1,
151 const NetworkServiceDiscovery::Service& s2)
152 {
153 return s1.instanceID < s2.instanceID;
154 };
155
156 std::sort (services.begin(), services.end(), compareServices);
157}
158
159 void NetworkServiceDiscovery::AvailableServiceList::handleMessage (const Service& service)
160{
161 const ScopedLock sl (listLock);
162
163 for (auto& s : services)
164 {
165 if (s.instanceID == service.instanceID)
166 {
167 if (s.description != service.description
168 || s.address != service.address
169 || s.port != service.port)
170 {
171 s = service;
172 triggerAsyncUpdate();
173 }
174
175 s.lastSeen = service.lastSeen;
176 return;
177 }
178 }
179
180 services.push_back (service);
181 sortServiceList (services);
182 triggerAsyncUpdate();
183}
184
185 void NetworkServiceDiscovery::AvailableServiceList::removeTimedOutServices()
186{
187 const double timeoutSeconds = 5.0;
188 auto oldestAllowedTime = Time::getCurrentTime() - RelativeTime::seconds (timeoutSeconds);
189
190 const ScopedLock sl (listLock);
191
192 auto oldEnd = std::end (services);
193 auto newEnd = std::remove_if (std::begin (services), oldEnd,
194 [=] (const Service& s) { return s.lastSeen < oldestAllowedTime; });
195
196 if (newEnd != oldEnd)
197 {
198 services.erase (newEnd, oldEnd);
199 triggerAsyncUpdate();
200 }
201}
202
203} // namespace juce
juce::CharPointer_UTF8
Definition: juce_CharPointer_UTF8.h:35
juce::DatagramSocket::bindToPort
bool bindToPort(int localPortNumber)
Definition: juce_Socket.cpp:668
juce::GenericScopedLock
Definition: juce_ScopedLock.h:55
juce::IPAddress
Definition: juce_IPAddress.h:33
juce::IPAddress::getLocalAddress
static IPAddress getLocalAddress(bool includeIPv6=false)
Definition: juce_IPAddress.cpp:357
juce::IPAddress::getInterfaceBroadcastAddress
static IPAddress getInterfaceBroadcastAddress(const IPAddress &interfaceAddress)
juce::RelativeTime
Definition: juce_RelativeTime.h:37
juce::RelativeTime::seconds
static RelativeTime seconds(double seconds) noexcept
Definition: juce_RelativeTime.cpp:33
juce::String
Definition: juce_String.h:39
juce::Thread
Definition: juce_Thread.h:43
juce::Thread::startThread
void startThread()
Definition: juce_Thread.cpp:122
juce::Time::getCurrentTime
static Time JUCE_CALLTYPE getCurrentTime() noexcept
Definition: juce_Time.cpp:218
juce::Uuid
Definition: juce_Uuid.h:39
juce::XmlElement
Definition: juce_XmlElement.h:138
juce::XmlElement::getIntAttribute
int getIntAttribute(StringRef attributeName, int defaultReturnValue=0) const
Definition: juce_XmlElement.cpp:571
juce::XmlElement::getStringAttribute
const String & getStringAttribute(StringRef attributeName) const noexcept
Definition: juce_XmlElement.cpp:555
juce::XmlElement::setAttribute
void setAttribute(const Identifier &attributeName, const String &newValue)
Definition: juce_XmlElement.cpp:615
juce::NetworkServiceDiscovery::Advertiser::Advertiser
Advertiser(const String &serviceTypeUID, const String &serviceDescription, int broadcastPort, int connectionPort, RelativeTime minTimeBetweenBroadcasts=RelativeTime::seconds(1.5))
Definition: juce_NetworkServiceDiscovery.cpp:31
juce::NetworkServiceDiscovery::Advertiser::~Advertiser
~Advertiser() override
Definition: juce_NetworkServiceDiscovery.cpp:47
juce::NetworkServiceDiscovery::AvailableServiceList::AvailableServiceList
AvailableServiceList(const String &serviceTypeUID, int broadcastPort)
Definition: juce_NetworkServiceDiscovery.cpp:78
juce::NetworkServiceDiscovery::AvailableServiceList::~AvailableServiceList
~AvailableServiceList() override
Definition: juce_NetworkServiceDiscovery.cpp:89
juce::NetworkServiceDiscovery::AvailableServiceList::getServices
std::vector< Service > getServices() const
Definition: juce_NetworkServiceDiscovery.cpp:119