big announce / getPeers change

1) getPeers is obsolete, peers are obtained from getData with r="tracker", t="m"
2) announce api of node.cpp is used to update our own memory table (of the tracker)
3) announce api of node.cpp only do getDate/announce to the network if peer is the local one
4) announcement rpc (to the network) might be removed in future (not sure)

libtorrent/include/libtorrent/kademlia/dht_tracker.hpp

@@ -90,7 +90,8 @@ namespace libtorrent { namespace dht
 
 		entry state() const;
 
-		void announce(sha1_hash const& ih, int listen_port, bool seed
+		void announce(std::string const& trackerName, sha1_hash const& ih
+			, address addr, int listen_port, bool seed, bool myself
 			, boost::function<void(std::vector<tcp::endpoint> const&)> f);
 
 		void putData(std::string const &username, std::string const &resource, bool multi,

libtorrent/include/libtorrent/kademlia/find_data.hpp

@@ -69,7 +69,7 @@ public:
 	void got_write_token(node_id const& n, std::string const& write_token)
 	{ m_write_tokens[n] = write_token; }
 
-	find_data(node_impl& node, node_id target
+	find_data(node_impl& node, const std::string &trackerName, node_id target
 		, data_callback const& dcallback
 		, nodes_callback const& ncallback
 		, bool noseeds);
@@ -89,6 +89,7 @@ private:
 	data_callback m_data_callback;
 	nodes_callback m_nodes_callback;
 	std::map<node_id, std::string> m_write_tokens;
+	std::string m_trackerName;
 	node_id const m_target;
 	bool m_done:1;
 	bool m_got_peers:1;

libtorrent/include/libtorrent/kademlia/node.hpp

@@ -210,7 +210,8 @@ public:
 	{ m_table.print_state(os); }
 #endif
 
-	void announce(sha1_hash const& info_hash, int listen_port, bool seed
+	void announce(std::string const& trackerName, sha1_hash const& info_hash
+		, address addr, int listen_port, bool seed, bool myself
 		, boost::function<void(std::vector<tcp::endpoint> const&)> f);
 
 	void putData(std::string const &username, std::string const &resource, bool multi,
@@ -263,8 +264,7 @@ protected:
 
 	void lookup_peers(sha1_hash const& info_hash, int prefix, entry& reply
 		, bool noseed, bool scrape) const;
-	bool lookup_torrents(sha1_hash const& target, entry& reply
-		, char* tags) const;
+	void add_peer(std::string const& name, sha1_hash const& info_hash, address addr, int port, bool seed);
 
 	dht_settings const& m_settings;
 	

libtorrent/src/kademlia/dht_tracker.cpp

@@ -416,10 +416,11 @@ namespace libtorrent { namespace dht
 #endif
 	}
 
-	void dht_tracker::announce(sha1_hash const& ih, int listen_port, bool seed
+	void dht_tracker::announce(std::string const& trackerName, sha1_hash const& ih
+		, address addr, int listen_port, bool seed, bool myself
 		, boost::function<void(std::vector<tcp::endpoint> const&)> f)
 	{
-		m_dht.announce(ih, listen_port, seed, f);
+		m_dht.announce(trackerName, ih, addr, listen_port, seed, myself, f);
 	}
 
 	void dht_tracker::putData(std::string const &username, std::string const &resource, bool multi,

libtorrent/src/kademlia/find_data.cpp

@@ -171,6 +171,7 @@ static void add_entry_fun(void* userdata, node_entry const& e)
 
 find_data::find_data(
 	node_impl& node
+	, std::string const& trackerName
 	, node_id target
 	, data_callback const& dcallback
 	, nodes_callback const& ncallback
@@ -178,6 +179,7 @@ find_data::find_data(
 	: traversal_algorithm(node, target)
 	, m_data_callback(dcallback)
 	, m_nodes_callback(ncallback)
+	, m_trackerName(trackerName)
 	, m_target(target)
 	, m_done(false)
 	, m_got_peers(false)
@@ -206,8 +208,12 @@ bool find_data::invoke(observer_ptr o)
 
 	entry e;
 	e["z"] = "q";
-	e["q"] = "getPeers";
+	e["q"] = "getData"; // "getPeers"
 	entry& a = e["x"];
+	entry& target = a["target"];
+	target["n"] = m_trackerName;
+	target["r"] = "tracker";
+	target["t"] = "m";
 	a["infoHash"] = m_target.to_string();
 	if (m_noseeds) a["noseed"] = 1;
 	return m_node.m_rpc.invoke(e, o->target_ep(), o);

libtorrent/src/kademlia/node.cpp

@@ -417,19 +417,24 @@ void node_impl::add_node(udp::endpoint node)
 	m_rpc.invoke(e, node, o);
 }
 
-void node_impl::announce(sha1_hash const& info_hash, int listen_port, bool seed
+void node_impl::announce(std::string const& trackerName, sha1_hash const& info_hash, address addr, int listen_port, bool seed, bool myself
 	, boost::function<void(std::vector<tcp::endpoint> const&)> f)
 {
 #ifdef TORRENT_DHT_VERBOSE_LOGGING
 	TORRENT_LOG(node) << "announcing [ ih: " << info_hash << " p: " << listen_port << " ]" ;
 #endif
+	add_peer( trackerName, info_hash, addr, listen_port, seed );
+
+	// do not announce other peers, just add them to our local m_map.
+	if( myself ) {
 		// search for nodes with ids close to id or with peers
 		// for info-hash id. then send announce_peer to them.
-	boost::intrusive_ptr<find_data> ta(new find_data(*this, info_hash, f
+		boost::intrusive_ptr<find_data> ta(new find_data(*this, trackerName, info_hash, f
 			, boost::bind(&announce_fun, _1, boost::ref(*this)
 			, listen_port, info_hash, seed), seed));
 		ta->start();
 	}
+}
 
 void node_impl::putData(std::string const &username, std::string const &resource, bool multi,
                         entry const &value, std::string const &sig_user,
@@ -592,6 +597,27 @@ void node_impl::lookup_peers(sha1_hash const& info_hash, int prefix, entry& repl
 	return;
 }
 
+void node_impl::add_peer(std::string const &name, sha1_hash const& info_hash, address addr, int port, bool seed)
+{
+	torrent_entry& v = m_map[info_hash];
+
+	// the peer announces a torrent name, and we don't have a name
+	// for this torrent. Store it.
+	if (name.size() && v.name.empty())
+	{
+		v.name = name;
+		if (v.name.size() > 50) v.name.resize(50);
+	}
+
+	peer_entry peer;
+	peer.addr = tcp::endpoint(addr, port);
+	peer.added = time_now();
+	peer.seed = seed;
+	std::set<peer_entry>::iterator i = v.peers.find(peer);
+	if (i != v.peers.end()) v.peers.erase(i++);
+	v.peers.insert(i, peer);
+}
+
 namespace
 {
 	void write_nodes_entry(entry& r, nodes_t const& nodes)
@@ -774,6 +800,7 @@ void node_impl::incoming_request(msg const& m, entry& e)
 		// we already have 't' and 'id' in the response
 		// no more left to add
 	}
+	/*
 	else if (strcmp(query, "getPeers") == 0)
 	{
 		key_desc_t msg_desc[] = {
@@ -813,7 +840,7 @@ void node_impl::incoming_request(msg const& m, entry& e)
 			TORRENT_LOG(node) << " values: " << reply["values"].list().size();
 		}
 #endif
-	}
+	}*/
 	else if (strcmp(query, "findNode") == 0)
 	{
 		key_desc_t msg_desc[] = {
@@ -909,24 +936,10 @@ void node_impl::incoming_request(msg const& m, entry& e)
 			}
 			m_map.erase(candidate);
 		}
-		torrent_entry& v = m_map[info_hash];
 
-		// the peer announces a torrent name, and we don't have a name
-		// for this torrent. Store it.
-		if (msg_keys[3] && v.name.empty())
-		{
-			std::string name = msg_keys[3]->string_value();
-			if (name.size() > 50) name.resize(50);
-			v.name = name;
-		}
+		add_peer( msg_keys[3] ? msg_keys[3]->string_value() : std::string(), info_hash,
+				  m.addr.address(), port, msg_keys[4] && msg_keys[4]->int_value());
 
-		peer_entry peer;
-		peer.addr = tcp::endpoint(m.addr.address(), port);
-		peer.added = time_now();
-		peer.seed = msg_keys[4] && msg_keys[4]->int_value();
-		std::set<peer_entry>::iterator i = v.peers.find(peer);
-		if (i != v.peers.end()) v.peers.erase(i++);
-		v.peers.insert(i, peer);
 #ifdef TORRENT_DHT_VERBOSE_LOGGING
 		++g_announces;
 #endif
@@ -1135,6 +1148,12 @@ void node_impl::incoming_request(msg const& m, entry& e)
 			return;
 		}
 
+		if (msg_keys[mk_t]->string_value() != "s" &&
+			msg_keys[mk_t]->string_value() != "m") {
+			incoming_error(e, "invalid target.t value");
+			return;
+		}
+
 		// target id is hash of bencoded dict "target"
 		std::pair<char const*, int> targetbuf = msg_keys[mk_target]->data_section();
 		sha1_hash target = hasher(targetbuf.first,targetbuf.second).final();
@@ -1159,6 +1178,10 @@ void node_impl::incoming_request(msg const& m, entry& e)
 		write_nodes_entry(reply, n);
 
 		bool hasData = false;
+
+		if( msg_keys[mk_r]->string_value() == "tracker" ) {
+			lookup_peers(target, 20, reply, false, false);
+		} else {
 			dht_storage_table_t::iterator i = m_storage_table.find(target);
 			if (i != m_storage_table.end())
 			{
@@ -1177,6 +1200,7 @@ void node_impl::incoming_request(msg const& m, entry& e)
 					values.push_back(v);
 				}
 			}
+		}
 
 		// check distance between target, nodes and our own id
 		// n is sorted from closer(begin) to more distant (end)

libtorrent/src/kademlia/refresh.cpp

@@ -49,7 +49,7 @@ refresh::refresh(
 	node_impl& node
 	, node_id target
 	, done_callback const& callback)
-	: find_data(node, target, find_data::data_callback(), callback, false)
+	: find_data(node, std::string(), target, find_data::data_callback(), callback, false)
 {
 }
 

libtorrent/src/torrent.cpp

@@ -2245,8 +2245,8 @@ namespace libtorrent
 #endif
 
 		boost::weak_ptr<torrent> self(shared_from_this());
-		m_ses.m_dht->announce(m_torrent_file->info_hash()
-			, port, is_seed()
+		m_ses.m_dht->announce(m_torrent_file->name(), m_torrent_file->info_hash()
+			, m_ses.external_address().external_address(address_v4()), port, is_seed(), true
 			, boost::bind(&torrent::on_dht_announce_response_disp, self, _1));
 	}