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ircd:Ⓜ️:dbs: Factor in the event_idx for a more stable messages sort.

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This commit is contained in:
Jason Volk 2018-04-22 13:49:02 -07:00
parent 246e20d624
commit 2557834a96
1 changed files with 13 additions and 6 deletions
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19
ircd/m/dbs.cc
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@ -563,21 +563,28 @@ ircd::m::dbs::desc::events__room_events__cmp
b.substr(sizes[1]),
};
// These conditions are matched on some queries when the user only
// supplies a room id.
if(empty(post[0]))
return true;
if(empty(post[1]))
return false;
// Now want just the depth...
const uint64_t depth[2]
// Distill out the depth and event_idx integers
const std::pair<uint64_t, event::idx> pair[2]
{
room_events_key(post[0]).first,
room_events_key(post[1]).first,
room_events_key(post[0]),
room_events_key(post[1])
};
// Highest to lowest sort so highest is first
return depth[1] < depth[0];
// When two events are at the same depth sort by index (the sequence
// number given as they were admitted into the system) otherwise
// sort by depth. Note this is a reverse order comparison.
return std::get<0>(pair[1]) != std::get<0>(pair[0])?
std::get<0>(pair[1]) < std::get<0>(pair[0]):
std::get<1>(pair[1]) < std::get<1>(pair[0]);
},
};