added alert messages for blocks finishing, pieces finishing and blocks being requested. patch by micah

include/libtorrent/alert_types.hpp

@@ -184,6 +184,63 @@ namespace libtorrent
 		{ return std::auto_ptr<alert>(new torrent_finished_alert(*this)); }
 	};
 
+	struct TORRENT_EXPORT piece_finished_alert: torrent_alert
+	{
+		piece_finished_alert(
+			const torrent_handle& h
+			, int piece_num
+			, const std::string& msg)
+			: torrent_alert(h, alert::warning, msg)
+			, piece_index(piece_num)
+		{ assert(piece_index >= 0);}
+
+		int piece_index;
+
+		virtual std::auto_ptr<alert> clone() const
+		{ return std::auto_ptr<alert>(new piece_finished_alert(*this)); }
+	};
+
+	struct TORRENT_EXPORT block_finished_alert: torrent_alert
+	{
+		block_finished_alert(
+			const torrent_handle& h
+			, int block_num
+			, int piece_num
+			, const std::string& msg)
+			: torrent_alert(h, alert::warning, msg)
+			, block_index(block_num)
+			, piece_index(piece_num)
+		{ assert(block_index >= 0 && piece_index >= 0);}
+
+		int block_index;
+		int piece_index;
+
+		virtual std::auto_ptr<alert> clone() const
+		{ return std::auto_ptr<alert>(new block_finished_alert(*this)); }
+	};
+
+	struct TORRENT_EXPORT block_downloading_alert: torrent_alert
+	{
+		block_downloading_alert(
+			const torrent_handle& h
+			, std::string& speedmsg
+			, int block_num
+			, int piece_num
+			, const std::string& msg)
+			: torrent_alert(h, alert::warning, msg)
+			, peer_speedmsg(speedmsg)
+			, block_index(block_num)
+			, piece_index(piece_num)
+		{ assert(block_index >= 0 && piece_index >= 0);}
+
+		std::string peer_speedmsg;
+		int block_index;
+		int piece_index;
+
+		virtual std::auto_ptr<alert> clone() const
+		{ return std::auto_ptr<alert>(new block_downloading_alert(*this)); }
+	};
+
 	struct TORRENT_EXPORT storage_moved_alert: torrent_alert
 	{
 		storage_moved_alert(torrent_handle const& h, std::string const& path)

include/libtorrent/torrent_handle.hpp

@@ -241,6 +241,12 @@ namespace libtorrent
 		enum { max_blocks_per_piece = 256 };
 		int piece_index;
 		int blocks_in_piece;
+		// the number of blocks in the finished state
+		int finished;
+		// the number of blocks in the writing state
+		int writing;
+		// the number of blocks in the requested state
+		int requested;
 		block_info blocks[max_blocks_per_piece];
 		enum state_t { none, slow, medium, fast };
 		state_t piece_state;

src/peer_connection.cpp

@@ -1193,6 +1193,11 @@ namespace libtorrent
 		assert(p.start == j.offset);
 		piece_block block_finished(p.piece, p.start / t->block_size());
 		picker.mark_as_finished(block_finished, peer_info_struct());
+		if (t->alerts().should_post(alert::info))
+		{
+			t->alerts().post_alert(block_finished_alert(t->get_handle(), 
+				block_finished.block_index, block_finished.piece_index, "block finished"));
+		}
 
 		if (!has_peer_choked() && !t->is_seed() && !m_torrent.expired())
 		{
@@ -1300,11 +1305,29 @@ namespace libtorrent
 
 		piece_picker::piece_state_t state;
 		peer_speed_t speed = peer_speed();
-		if (speed == fast) state = piece_picker::fast;
-		else if (speed == medium) state = piece_picker::medium;
-		else state = piece_picker::slow;
+		std::string speedmsg;
+		if (speed == fast)
+		{
+			speedmsg = "fast";
+			state = piece_picker::fast;
+		}
+		else if (speed == medium)
+		{
+			speedmsg = "medium";
+			state = piece_picker::medium;
+		}
+		else
+		{
+			speedmsg = "slow";
+			state = piece_picker::slow;
+		}
 
 		t->picker().mark_as_downloading(block, peer_info_struct(), state);
+                if (t->alerts().should_post(alert::info))
+		{
+			t->alerts().post_alert(block_downloading_alert(t->get_handle(), 
+				speedmsg, block.block_index, block.piece_index, "block downloading"));
+		}
 
 		m_request_queue.push_back(block);
 	}

src/torrent.cpp

@@ -831,6 +831,11 @@ namespace libtorrent
 
 		if (passed_hash_check)
 		{
+                        if (m_ses.m_alerts.should_post(alert::info))
+			{
+				m_ses.m_alerts.post_alert(piece_finished_alert(get_handle()
+					, index, "piece finished"));
+			}
 			// the following call may cause picker to become invalid
 			// in case we just became a seed
 			announce_piece(index);

src/torrent_handle.cpp

@@ -773,6 +773,9 @@ namespace libtorrent
 			partial_piece_info pi;
 			pi.piece_state = (partial_piece_info::state_t)i->state;
 			pi.blocks_in_piece = p.blocks_in_piece(i->index);
+			pi.finished = (int)i->finished;
+			pi.writing = (int)i->writing;
+			pi.requested = (int)i->requested;
 			int piece_size = t->torrent_file().piece_size(i->index);
 			for (int j = 0; j < pi.blocks_in_piece; ++j)
 			{