[tor-bugs] #6763 [Tor Directory Authority]: Combine "m" lines with identical hash values

["Tor Bug Tracker & Wiki" <torproject-admin@xxxxxxxxxxxxxx>]

#6763: Combine "m" lines with identical hash values
-------------------------------------+--------------------------------------
 Reporter:  ln5                      |          Owner:     
     Type:  enhancement              |         Status:  new
 Priority:  minor                    |      Milestone:     
Component:  Tor Directory Authority  |        Version:     
 Keywords:  ipv6                     |         Parent:     
   Points:                           |   Actualpoints:     
-------------------------------------+--------------------------------------
 dirserv_generate_networkstatus_vote_obj() recently (or soon to be,
 depending on how you see it -- it sits in my branch bug6363_5535)
 started generating two "m" lines in votes, one for consensus methods
 8-13 and one for method 14 ("a" lines).

 For relays without an IPv6 address (i.e. not including an "or-address"
 line in their descriptor), the two hashes will be identical.

 As an optimisation we could combine two "m" lines with identical hash
 values. As an example, instead of saying

 {{{
     "m 1,2,3 H1"
     "m 4,5 H1"
 }}}

 we would say

 {{{
     "m 1,2,3,4,5 H1"
 }}}

 but still say

 {{{
     "m 1,2,3 H1"
     "m 4,5 H2"
 }}}

 This affects the size of the votes only and don't affect bandwidth
 consumption for ordinary relays or clients in any way.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6763>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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