From 9f3ba737d608b58eb4ebdff37a753cd3de735290 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Sun, 26 Jan 2014 13:14:15 +0100
Subject: upnp/Discovery: add listener interface

---
 src/lib/upnp/Discovery.cxx | 28 +++++++++++++++++++++++++++-
 src/lib/upnp/Discovery.hxx | 10 +++++++++-
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/src/lib/upnp/Discovery.cxx b/src/lib/upnp/Discovery.cxx
index 5203dba83..da32372ba 100644
--- a/src/lib/upnp/Discovery.cxx
+++ b/src/lib/upnp/Discovery.cxx
@@ -53,6 +53,24 @@ isMSDevice(const char *st)
 	return memcmp(MediaServerDType, st, sz) == 0;
 }
 
+static void
+AnnounceFoundUPnP(UPnPDiscoveryListener &listener, const UPnPDevice &device)
+{
+	for (const auto &service : device.services)
+		if (isCDService(service.serviceType.c_str()))
+			listener.FoundUPnP(ContentDirectoryService(device,
+								   service));
+}
+
+static void
+AnnounceLostUPnP(UPnPDiscoveryListener &listener, const UPnPDevice &device)
+{
+	for (const auto &service : device.services)
+		if (isCDService(service.serviceType.c_str()))
+			listener.LostUPnP(ContentDirectoryService(device,
+								  service));
+}
+
 inline void
 UPnPDeviceDirectory::LockAdd(ContentDirectoryDescriptor &&d)
 {
@@ -66,6 +84,9 @@ UPnPDeviceDirectory::LockAdd(ContentDirectoryDescriptor &&d)
 	}
 
 	directories.emplace_back(std::move(d));
+
+	if (listener != nullptr)
+		AnnounceFoundUPnP(*listener, directories.back().device);
 }
 
 inline void
@@ -76,6 +97,9 @@ UPnPDeviceDirectory::LockRemove(const std::string &id)
 	for (auto i = directories.begin(), end = directories.end();
 	     i != end; ++i) {
 		if (i->id == id) {
+			if (listener != nullptr)
+				AnnounceLostUPnP(*listener, i->device);
+
 			directories.erase(i);
 			break;
 		}
@@ -208,8 +232,10 @@ UPnPDeviceDirectory::expireDevices(Error &error)
 	return true;
 }
 
-UPnPDeviceDirectory::UPnPDeviceDirectory(LibUPnP *_lib)
+UPnPDeviceDirectory::UPnPDeviceDirectory(LibUPnP *_lib,
+					 UPnPDiscoveryListener *_listener)
 	:lib(_lib),
+	 listener(_listener),
 	 discoveredQueue("DiscoveredQueue"),
 	 m_searchTimeout(2), m_lastSearch(0)
 {
diff --git a/src/lib/upnp/Discovery.hxx b/src/lib/upnp/Discovery.hxx
index 4c64fe420..3208f8727 100644
--- a/src/lib/upnp/Discovery.hxx
+++ b/src/lib/upnp/Discovery.hxx
@@ -34,6 +34,12 @@
 class LibUPnP;
 class ContentDirectoryService;
 
+class UPnPDiscoveryListener {
+public:
+	virtual void FoundUPnP(const ContentDirectoryService &service) = 0;
+	virtual void LostUPnP(const ContentDirectoryService &service) = 0;
+};
+
 /**
  * Manage UPnP discovery and maintain a directory of active devices. Singleton.
  *
@@ -86,6 +92,7 @@ class UPnPDeviceDirectory {
 	};
 
 	LibUPnP *const lib;
+	UPnPDiscoveryListener *const listener;
 
 	Mutex mutex;
 	std::list<ContentDirectoryDescriptor> directories;
@@ -104,7 +111,8 @@ class UPnPDeviceDirectory {
 	unsigned m_lastSearch;
 
 public:
-	UPnPDeviceDirectory(LibUPnP *_lib);
+	UPnPDeviceDirectory(LibUPnP *_lib,
+			    UPnPDiscoveryListener *_listener=nullptr);
 	~UPnPDeviceDirectory();
 
 	UPnPDeviceDirectory(const UPnPDeviceDirectory &) = delete;
-- 
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