dht_reply_data_done_alert to unlock client waiting for data

libtorrent/include/libtorrent/alert_types.hpp

@@ -1163,6 +1163,27 @@ namespace libtorrent
 		entry::list_type const m_lst;
 	};
 
+	struct TORRENT_EXPORT dht_reply_data_done_alert: alert
+	{
+		dht_reply_data_done_alert(std::string const &username,
+					  std::string const &resource, bool multi,
+					  bool is_neighbor, bool got_data)
+		    : m_username(username), m_resource(resource), m_multi(multi),
+		      m_is_neighbor(is_neighbor), m_got_data(got_data)
+		{}
+
+		TORRENT_DEFINE_ALERT(dht_reply_data_done_alert);
+
+		const static int static_category = alert::dht_notification;
+		virtual std::string message() const;
+
+		std::string const m_username;
+		std::string const m_resource;
+		bool m_multi;
+		bool m_is_neighbor;
+		bool m_got_data;
+	};
+
 	struct TORRENT_EXPORT dht_get_data_alert: alert
 	{
 		dht_get_data_alert(entry const& target, bool possiblyNeighbor, bool hasData)

libtorrent/include/libtorrent/kademlia/dht_tracker.hpp

@@ -98,7 +98,8 @@ namespace libtorrent { namespace dht
 			     int timeutc, int seq);
 
 		void getData(std::string const &username, std::string const &resource, bool multi,
-			     boost::function<void(entry::list_type const&)> f);
+			     boost::function<void(entry::list_type const&)> fdata,
+			     boost::function<void(bool, bool)> fdone);
 
 		void dht_status(session_status& s);
 		void network_stats(int& sent, int& received);

libtorrent/include/libtorrent/kademlia/node.hpp

@@ -253,7 +253,8 @@ public:
 		     int timeutc, int seq);
 
 	void getData(std::string const &username, std::string const &resource, bool multi,
-		     boost::function<void(entry::list_type const&)> f);
+		     boost::function<void(entry::list_type const&)> fdata,
+		     boost::function<void(bool, bool)> fdone);
 
 	bool verify_token(std::string const& token, char const* info_hash
 		, udp::endpoint const& addr);

libtorrent/src/alert.cpp

@@ -358,6 +358,13 @@ namespace libtorrent {
 		return msg;
 	}
 
+	std::string  dht_reply_data_done_alert::message() const
+	{
+		char msg[200];
+		snprintf(msg, sizeof(msg), "reply of getData done");
+		return msg;
+	}
+
 	std::string dht_get_data_alert::message() const
 	{
 		char msg[200];

libtorrent/src/kademlia/dht_tracker.cpp

@@ -430,9 +430,10 @@ namespace libtorrent { namespace dht
 	}
 
 	void dht_tracker::getData(std::string const &username, std::string const &resource, bool multi,
-		     boost::function<void(entry::list_type const&)> f)
+				  boost::function<void(entry::list_type const&)> fdata,
+				  boost::function<void(bool, bool)> fdone)
 	{
-		m_dht.getData(username, resource, multi, f);
+		m_dht.getData(username, resource, multi, fdata, fdone);
 	}
 
 

libtorrent/src/kademlia/node.cpp

@@ -365,6 +365,14 @@ namespace
 			node.m_rpc.invoke(e, i->first.ep(), o);
 		}
 	}
+
+	void getDataDone_fun(std::vector<std::pair<node_entry, std::string> > const& node_results,
+			     bool got_data, node_impl& node,
+			     boost::function<void(bool, bool)> fdone)
+	{
+	    bool is_neighbor = false;
+	    fdone(is_neighbor, got_data);
+	}
 }
 
 void node_impl::add_router_node(udp::endpoint router)
@@ -431,15 +439,17 @@ void node_impl::putData(std::string const &username, std::string const &resource
 }
 
 void node_impl::getData(std::string const &username, std::string const &resource, bool multi,
-			boost::function<void(entry::list_type const&)> f)
+			boost::function<void(entry::list_type const&)> fdata,
+			boost::function<void(bool, bool)> fdone)
 {
 #ifdef TORRENT_DHT_VERBOSE_LOGGING
 	TORRENT_LOG(node) << "getData [ username: " << info_hash << " res: " << resource << " ]" ;
 #endif
 	// search for nodes with ids close to id or with peers
 	// for info-hash id. callback is used to return data.
-	boost::intrusive_ptr<dht_get> ta(new dht_get(*this, username, resource, multi, f,
-		 boost::bind(&nop), false));
+	boost::intrusive_ptr<dht_get> ta(new dht_get(*this, username, resource, multi,
+		 fdata,
+		 boost::bind(&getDataDone_fun, _1, _2, boost::ref(*this), fdone), false));
 	ta->start();
 }
 

libtorrent/src/session_impl.cpp

@@ -5748,9 +5748,22 @@ retry:
 	    }
 	}
 
+	void getDataDone_fun(aux::session_impl *si,
+			     std::string const &username, std::string const &resource, bool multi,
+			     bool is_neighbor, bool got_data)
+	{
+	    if( si->m_alerts.should_post<dht_reply_data_done_alert>() ) {
+		si->m_alerts.post_alert(
+		    dht_reply_data_done_alert(username, resource, multi,
+					      is_neighbor, got_data));
+	    }
+	}
+
 	void session_impl::dht_getData(std::string const &username, std::string const &resource, bool multi)
 	{
-	    if (m_dht) m_dht->getData(username, resource, multi, boost::bind( post_dht_getData, this, _1));
+	    if (m_dht) m_dht->getData(username, resource, multi,
+				      boost::bind( post_dht_getData, this, _1),
+				      boost::bind( getDataDone_fun, this, username, resource, multi, _1, _2));
 	}
 
 	void session_impl::on_dht_router_name_lookup(error_code const& e

src/twister.cpp

@@ -218,6 +218,8 @@ void ThreadMaintainDHTNodes()
 
 void ThreadSessionAlerts()
 {
+    static map<uint256, entry> neighborCheck;
+
     while(!ses) {
         MilliSleep(200);
     }
@@ -271,14 +273,53 @@ void ThreadSessionAlerts()
                 if (gd)
                 {
                     if( gd->m_possiblyNeighbor ) {
-                        printf("possiblyNeighbor of [%s,%s,%s]\n",
-                               gd->m_target.find_key("n")->string().c_str(),
-                               gd->m_target.find_key("r")->string().c_str(),
-                               gd->m_target.find_key("t")->string().c_str());
+                        entry const *n = gd->m_target.find_key("n");
+                        entry const *r = gd->m_target.find_key("r");
+                        entry const *t = gd->m_target.find_key("t");
+
+                        if( n && n->type() == entry::string_t &&
+                            r && r->type() == entry::string_t &&
+                            t && t->type() == entry::string_t) {
+
+                            // now we do our own search to make sure we are really close to this target
+                            uint256 th = dhtTargetHash(n->string(), r->string(), t->string());
+
+                            if( !neighborCheck.count(th) ) {
+                                printf("possiblyNeighbor of [%s,%s,%s]\n",
+                                       n->string().c_str(),
+                                       r->string().c_str(),
+                                       t->string().c_str());
+
+                                neighborCheck[th] = gd->m_target;
+                                ses->dht_getData(n->string(), r->string(), t->string() == "m");
+                            }
+                        }
+
                     }
                     continue;
                 }
 
+                dht_reply_data_done_alert const* dd = alert_cast<dht_reply_data_done_alert>(*i);
+                if (dd)
+                {
+                    printf("get_data_gone [%s,%s,%s] is_neighbor=%d got_data=%d\n",
+                           dd->m_username.c_str(), dd->m_resource.c_str(), dd->m_multi ? "m" : "s",
+                           dd->m_is_neighbor, dd->m_got_data);
+
+                    uint256 th = dhtTargetHash(dd->m_username, dd->m_resource, dd->m_multi ? "m" : "s");
+
+                    {
+                        LOCK(cs_dhtgetMap);
+                        std::map<uint256, alert_manager*>::iterator mi = m_dhtgetMap.find(th);
+                        if( mi != m_dhtgetMap.end() && !dd->m_got_data ) {
+                            // post alert to return from wait_for_alert in dhtget()
+                            alert_manager *am = (*mi).second;
+                            am->post_alert(*dd);
+                        }
+                    }
+
+                    continue;
+                }
 
                 /*
                 save_resume_data_alert const* rd = alert_cast<save_resume_data_alert>(*i);
@@ -500,13 +541,17 @@ Value dhtget(const Array& params, bool fHelp)
 
     ses->dht_getData(strUsername, strResource, multi);
 
-    Value ret;
+    Value ret = Array();
 
-    if( am.wait_for_alert(seconds(10)) ) {
+    if( am.wait_for_alert(seconds(20)) ) {
         std::auto_ptr<alert> a(am.get());
 
         dht_reply_data_alert const* rd = alert_cast<dht_reply_data_alert>(&(*a));
-        ret = entryToJson(rd->m_lst);
+        if( rd ) {
+            ret = entryToJson(rd->m_lst);
+        } else {
+            // cast failed => dht_reply_data_done_alert => no data
+        }
     }
 
     {