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/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2017 - ROLI Ltd.
JUCE is an open source library subject to commercial or open-source
licensing.
The code included in this file is provided under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license. Permission
To use, copy, modify, and/or distribute this software for any purpose with or
without fee is hereby granted provided that the above copyright notice and
this permission notice appear in all copies.
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.
==============================================================================
*/
namespace juce
{
#if JUCE_ANDROID
extern void acquireMulticastLock();
extern void releaseMulticastLock();
#endif
NetworkServiceDiscovery::Advertiser::Advertiser (const String& serviceTypeUID,
const String& serviceDescription,
int broadcastPortToUse, int connectionPort,
RelativeTime minTimeBetweenBroadcasts)
: Thread ("Discovery_broadcast"),
message (serviceTypeUID), broadcastPort (broadcastPortToUse),
minInterval (minTimeBetweenBroadcasts)
{
message.setAttribute ("id", Uuid().toString());
message.setAttribute ("name", serviceDescription);
message.setAttribute ("address", String());
message.setAttribute ("port", connectionPort);
startThread (2);
}
NetworkServiceDiscovery::Advertiser::~Advertiser()
{
stopThread (2000);
socket.shutdown();
}
void NetworkServiceDiscovery::Advertiser::run()
{
if (! socket.bindToPort (0))
{
jassertfalse;
return;
}
while (! threadShouldExit())
{
sendBroadcast();
wait ((int) minInterval.inMilliseconds());
}
}
void NetworkServiceDiscovery::Advertiser::sendBroadcast()
{
auto localAddress = IPAddress::getLocalAddress();
message.setAttribute ("address", localAddress.toString());
auto broadcastAddress = IPAddress::getInterfaceBroadcastAddress (localAddress);
auto data = message.toString (XmlElement::TextFormat().singleLine().withoutHeader());
socket.write (broadcastAddress.toString(), broadcastPort, data.toRawUTF8(), (int) data.getNumBytesAsUTF8());
}
//==============================================================================
NetworkServiceDiscovery::AvailableServiceList::AvailableServiceList (const String& serviceType, int broadcastPort)
: Thread ("Discovery_listen"), serviceTypeUID (serviceType)
{
#if JUCE_ANDROID
acquireMulticastLock();
#endif
socket.bindToPort (broadcastPort);
startThread (2);
}
NetworkServiceDiscovery::AvailableServiceList::~AvailableServiceList()
{
socket.shutdown();
stopThread (2000);
#if JUCE_ANDROID
releaseMulticastLock();
#endif
}
void NetworkServiceDiscovery::AvailableServiceList::run()
{
while (! threadShouldExit())
{
if (socket.waitUntilReady (true, 200) == 1)
{
char buffer[1024];
auto bytesRead = socket.read (buffer, sizeof (buffer) - 1, false);
if (bytesRead > 10)
if (auto xml = parseXML (String (CharPointer_UTF8 (buffer),
CharPointer_UTF8 (buffer + bytesRead))))
if (xml->hasTagName (serviceTypeUID))
handleMessage (*xml);
}
removeTimedOutServices();
}
}
std::vector<NetworkServiceDiscovery::Service> NetworkServiceDiscovery::AvailableServiceList::getServices() const
{
const ScopedLock sl (listLock);
auto listCopy = services;
return listCopy;
}
void NetworkServiceDiscovery::AvailableServiceList::handleAsyncUpdate()
{
if (onChange != nullptr)
onChange();
}
void NetworkServiceDiscovery::AvailableServiceList::handleMessage (const XmlElement& xml)
{
Service service;
service.instanceID = xml.getStringAttribute ("id");
if (service.instanceID.trim().isNotEmpty())
{
service.description = xml.getStringAttribute ("name");
service.address = IPAddress (xml.getStringAttribute ("address"));
service.port = xml.getIntAttribute ("port");
service.lastSeen = Time::getCurrentTime();
handleMessage (service);
}
}
static void sortServiceList (std::vector<NetworkServiceDiscovery::Service>& services)
{
auto compareServices = [] (const NetworkServiceDiscovery::Service& s1,
const NetworkServiceDiscovery::Service& s2)
{
return s1.instanceID < s2.instanceID;
};
std::sort (services.begin(), services.end(), compareServices);
}
void NetworkServiceDiscovery::AvailableServiceList::handleMessage (const Service& service)
{
const ScopedLock sl (listLock);
for (auto& s : services)
{
if (s.instanceID == service.instanceID)
{
if (s.description != service.description
|| s.address != service.address
|| s.port != service.port)
{
s = service;
triggerAsyncUpdate();
}
s.lastSeen = service.lastSeen;
return;
}
}
services.push_back (service);
sortServiceList (services);
triggerAsyncUpdate();
}
void NetworkServiceDiscovery::AvailableServiceList::removeTimedOutServices()
{
const double timeoutSeconds = 5.0;
auto oldestAllowedTime = Time::getCurrentTime() - RelativeTime::seconds (timeoutSeconds);
const ScopedLock sl (listLock);
auto oldEnd = std::end (services);
auto newEnd = std::remove_if (std::begin (services), oldEnd,
[=] (const Service& s) { return s.lastSeen < oldestAllowedTime; });
if (newEnd != oldEnd)
{
services.erase (newEnd, oldEnd);
triggerAsyncUpdate();
}
}
} // namespace juce
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