ual void <strong>abort</strong> ();
   virtual bool <strong>on_dht_request</strong> (string_view <em>/* query */</em>
      , udp::endpoint const&amp; <em>/* source */</em>, bdecode_node const&amp; <em>/* message */</em>
      , entry&amp; <em>/* response */</em>);
   virtual void <strong>on_alert</strong> (alert const*);
   virtual bool <strong>on_unknown_torrent</strong> (info_hash_t const&amp; <em>/* info_hash */</em>
      , peer_connection_handle const&amp; <em>/* pc */</em>, add_torrent_params&amp; <e