fix issue where num_seeds could be greater than num_peers in torrent_status (#1645)

fix issue where num_seeds could be greater than num_peers in torrent_status

ChangeLog

@@ -1,3 +1,4 @@
+	* fix issue where num_seeds could be greater than num_peers in torrent_status
 	* finished non-seed torrents can also be in super-seeding mode
 	* fix issue related to unloading torrents
 	* fixed finished-time calculation

include/libtorrent/torrent.hpp

@@ -1110,12 +1110,26 @@ namespace libtorrent
 		void inc_refcount(char const* purpose);
 		int refcount() const { return m_refcount; }
 
-		void inc_num_connecting()
+		void inc_num_connecting(torrent_peer* pp)
-		{ ++m_num_connecting; }
+		{
-		void dec_num_connecting()
+			++m_num_connecting;
+			TORRENT_ASSERT(m_num_connecting <= int(m_connections.size()));
+			if (pp->seed)
+			{
+				++m_num_connecting_seeds;
+				TORRENT_ASSERT(m_num_connecting_seeds <= int(m_connections.size()));
+			}
+		}
+		void dec_num_connecting(torrent_peer* pp)
 		{
 			TORRENT_ASSERT(m_num_connecting > 0);
 			--m_num_connecting;
+			if (pp->seed)
+			{
+				TORRENT_ASSERT(m_num_connecting_seeds > 0);
+				--m_num_connecting_seeds;
+			}
+			TORRENT_ASSERT(m_num_connecting <= int(m_connections.size()));
 		}
 
 		bool is_ssl_torrent() const { return m_ssl_torrent; }
@@ -1127,7 +1141,7 @@ namespace libtorrent
 		void set_ssl_cert_buffer(std::string const& certificate
 			, std::string const& private_key
 			, std::string const& dh_params);
-		boost::asio::ssl::context* ssl_ctx() const { return m_ssl_ctx.get(); } 
+		boost::asio::ssl::context* ssl_ctx() const { return m_ssl_ctx.get(); }
 #endif
 
 		int num_time_critical_pieces() const
@@ -1646,6 +1660,10 @@ namespace libtorrent
 		// counting the peer connections that say true for is_seed()
 		boost::uint16_t m_num_seeds;
 
+		// this is the number of peers that are seeds, and count against
+		// m_num_seeds, but have not yet been connected
+		boost::uint16_t m_num_connecting_seeds;
+
 		// the timestamp of the last byte uploaded from this torrent specified in
 		// session_time. This is signed because it must be able to represent time
 		// before the session started.

src/peer_connection.cpp

@@ -208,7 +208,6 @@ namespace libtorrent
 		// if t is NULL, we better not be connecting, since
 		// we can't decrement the connecting counter
 		TORRENT_ASSERT(t || !m_connecting);
-		if (m_connecting && t) t->inc_num_connecting();
 		m_est_reciprocation_rate = m_settings.get_int(settings_pack::default_est_reciprocation_rate);
 
 		m_channel_state[upload_channel] = peer_info::bw_idle;
@@ -369,6 +368,8 @@ namespace libtorrent
 		// if this is an incoming connection, we're done here
 		if (!m_connecting) return;
 
+		if (m_connecting && t) t->inc_num_connecting(m_peer_info);
+
 #ifndef TORRENT_DISABLE_LOGGING
 		peer_log(peer_log_alert::outgoing, "OPEN", "protocol: %s"
 			, (m_remote.address().is_v4()?"IPv4":"IPv6"));
@@ -820,7 +821,7 @@ namespace libtorrent
 		if (m_connecting)
 		{
 			m_counters.inc_stats_counter(counters::num_peers_half_open, -1);
-			if (t) t->dec_num_connecting();
+			if (t) t->dec_num_connecting(m_peer_info);
 			m_connecting = false;
 		}
 
@@ -4014,7 +4015,7 @@ namespace libtorrent
 		if (m_connecting)
 		{
 			m_counters.inc_stats_counter(counters::num_peers_half_open, -1);
-			if (t) t->dec_num_connecting();
+			if (t) t->dec_num_connecting(m_peer_info);
 			m_connecting = false;
 		}
 
@@ -4228,7 +4229,7 @@ namespace libtorrent
 		if (m_connecting)
 		{
 			m_counters.inc_stats_counter(counters::num_peers_half_open, -1);
-			if (t) t->dec_num_connecting();
+			if (t) t->dec_num_connecting(m_peer_info);
 			m_connecting = false;
 		}
 
@@ -4730,7 +4731,7 @@ namespace libtorrent
 			if (m_connecting)
 			{
 				m_counters.inc_stats_counter(counters::num_peers_half_open, -1);
-				if (t) t->dec_num_connecting();
+				if (t) t->dec_num_connecting(m_peer_info);
 				m_connecting = false;
 			}
 			disconnect(errors::torrent_aborted, op_bittorrent);
@@ -6330,7 +6331,7 @@ namespace libtorrent
 		if (m_connecting)
 		{
 			m_counters.inc_stats_counter(counters::num_peers_half_open, -1);
-			if (t) t->dec_num_connecting();
+			if (t) t->dec_num_connecting(m_peer_info);
 			m_connecting = false;
 		}
 
@@ -6358,7 +6359,7 @@ namespace libtorrent
 		}
 
 		// if there are outgoing interfaces specified, verify this
-		// peer is correctly bound to on of them
+		// peer is correctly bound to one of them
 		if (!m_settings.get_str(settings_pack::outgoing_interfaces).empty())
 		{
 			if (!m_ses.verify_bound_address(m_local.address()

src/torrent.cpp

@@ -269,6 +269,7 @@ namespace libtorrent
 		, m_should_be_loaded(true)
 		, m_last_download((std::numeric_limits<boost::int16_t>::min)())
 		, m_num_seeds(0)
+		, m_num_connecting_seeds(0)
 		, m_last_upload((std::numeric_limits<boost::int16_t>::min)())
 		, m_storage_tick(0)
 		, m_auto_managed(p.flags & add_torrent_params::flag_auto_managed)
@@ -3662,7 +3663,7 @@ namespace libtorrent
 			return;
 		}
 
-		if (int(m_connections.size()) - m_num_connecting < 10)
+		if (int(m_connections.size() - m_num_connecting) < 10)
 		{
 			// there are too few peers. Be conservative and don't assume it's
 			// well seeded until we can connect to more peers
@@ -3673,8 +3674,8 @@ namespace libtorrent
 		// if there are at least 10 seeds, and there are 10 times more
 		// seeds than downloaders, enter sequential download mode
 		// (for performance)
-		int downloaders = num_downloaders();
+		int const downloaders = num_downloaders();
-		int seeds = num_seeds();
+		int const seeds = num_seeds();
 		m_auto_sequential = downloaders * 10 <= seeds
 			&& seeds > 9;
 	}
@@ -9063,6 +9064,8 @@ namespace libtorrent
 
 		int seeds = 0;
 		int num_uploads = 0;
+		int num_connecting = 0;
+		int num_connecting_seeds = 0;
 		std::map<piece_block, int> num_requests;
 		for (const_peer_iterator i = this->begin(); i != this->end(); ++i)
 		{
@@ -9072,6 +9075,11 @@ namespace libtorrent
 #endif
 			peer_connection const& p = *(*i);
 
+			if (p.is_connecting()) ++num_connecting;
+
+			if (p.is_connecting() && p.peer_info_struct()->seed)
+				++num_connecting_seeds;
+
 			if (p.peer_info_struct() && p.peer_info_struct()->seed)
 				++seeds;
 
@@ -9094,6 +9102,14 @@ namespace libtorrent
 		}
 		TORRENT_ASSERT(num_uploads == int(m_num_uploads));
 		TORRENT_ASSERT(seeds == int(m_num_seeds));
+		TORRENT_ASSERT(num_connecting == int(m_num_connecting));
+		TORRENT_ASSERT(num_connecting_seeds == int(m_num_connecting_seeds));
+		TORRENT_ASSERT(int(m_num_uploads) <= int(m_connections.size()));
+		TORRENT_ASSERT(int(m_num_seeds) <= int(m_connections.size()));
+		TORRENT_ASSERT(int(m_num_connecting) <= int(m_connections.size()));
+		TORRENT_ASSERT(int(m_num_connecting_seeds) <= int(m_connections.size()));
+		TORRENT_ASSERT(int(m_num_connecting) + int(m_num_seeds) >= int(m_num_connecting_seeds));
+		TORRENT_ASSERT(int(m_num_connecting) + int(m_num_seeds) - int(m_num_connecting_seeds) <= int(m_connections.size()));
 
 		if (has_picker())
 		{
@@ -12244,20 +12260,27 @@ namespace libtorrent
 		m_stats_counters.inc_stats_counter(counters::recv_failed_bytes, b);
 	}
 
+	// the number of connected peers that are seeds
 	int torrent::num_seeds() const
 	{
 		TORRENT_ASSERT(is_single_thread());
 		INVARIANT_CHECK;
 
-		return m_num_seeds;
+		return int(m_num_seeds) - int(m_num_connecting_seeds);
 	}
 
+	// the number of connected peers that are not seeds
 	int torrent::num_downloaders() const
 	{
 		TORRENT_ASSERT(is_single_thread());
 		INVARIANT_CHECK;
 
-		return (std::max)(0, int(m_connections.size()) - m_num_seeds - m_num_connecting);
+		int const ret = int(m_connections.size())
+			- m_num_seeds
+			- m_num_connecting
+			+ m_num_connecting_seeds;
+		TORRENT_ASSERT(ret >= 0);
+		return ret;
 	}
 
 	void torrent::tracker_request_error(tracker_request const& r