add default peer rate limit setting

docs/manual.rst

@@ -3783,6 +3783,9 @@ session_settings
 		bool incoming_starts_queued_torrents;
 		bool report_true_downloaded;
 		bool strict_end_game_mode;
+
+		int default_peer_upload_rate;
+		int default_peer_download_rate;
 	};
 
 ``user_agent`` this is the client identification to the tracker.
@@ -4379,6 +4382,13 @@ If this is ``false``, libtorrent attempts to use each peer connection
 to its max, by always requesting something, even if it means requesting
 something that has been requested from another peer already.
 
+``default_peer_upload_rate`` and ``default_peer_download_rate`` specifies
+the default upload and download rate limits for peers, respectively. These
+default to 0, which means unlimited. These settings affect the rate limits
+set on new peer connections (not existing ones). The peer rate limits can
+be changed individually later using
+`set_peer_upload_limit() set_peer_download_limit()`_.
+
 pe_settings
 ===========
 

include/libtorrent/session_settings.hpp

@@ -204,6 +204,8 @@ namespace libtorrent
 			, incoming_starts_queued_torrents(false)
 			, report_true_downloaded(false)
 			, strict_end_game_mode(true)
+			, default_peer_upload_rate(0)
+			, default_peer_download_rate(0)
 		{}
 
 		// this is the user agent that will be sent to the tracker
@@ -774,6 +776,10 @@ namespace libtorrent
 		// if set to true, libtorrent won't request a piece multiple times
 		// until every piece is requested
 		bool strict_end_game_mode;
+
+		// each peer will have these limits set on it
+		int default_peer_upload_rate;
+		int default_peer_download_rate;
 	};
 
 #ifndef TORRENT_DISABLE_DHT

src/session_impl.cpp

@@ -301,6 +301,8 @@ namespace aux {
 		TORRENT_SETTING(boolean, incoming_starts_queued_torrents)
 		TORRENT_SETTING(boolean, report_true_downloaded)
 		TORRENT_SETTING(boolean, strict_end_game_mode)
+		TORRENT_SETTING(integer, default_peer_upload_rate)
+		TORRENT_SETTING(integer, default_peer_download_rate)
 	};
 
 #undef TORRENT_SETTING
@@ -1610,6 +1612,10 @@ namespace aux {
 		{
 			m_connections.insert(c);
 			c->start();
+			if (m_settings.default_peer_upload_rate)
+				c->set_upload_limit(m_settings.default_peer_upload_rate);
+			if (m_settings.default_peer_download_rate)
+				c->set_download_limit(m_settings.default_peer_download_rate);
 		}
 	}
 

src/torrent.cpp

@@ -4136,6 +4136,11 @@ namespace libtorrent
 		c->m_in_constructor = false;
 #endif
 
+		if (settings().default_peer_upload_rate)
+			c->set_upload_limit(settings().default_peer_upload_rate);
+		if (settings().default_peer_download_rate)
+			c->set_download_limit(settings().default_peer_download_rate);
+
  		c->add_stat(peerinfo->prev_amount_download, peerinfo->prev_amount_upload);
  		peerinfo->prev_amount_download = 0;
  		peerinfo->prev_amount_upload = 0;