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Code Issues Releases Wiki Activity

ircd::net::dns: Perturb the minimum TTL to avoid groupings on expiration.

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This commit is contained in:
Jason Volk 2022-08-11 21:38:36 -07:00
parent 26d34224b6
commit 5ce08521d5
1 changed files with 19 additions and 14 deletions
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33
ircd/net_dns.cc
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@ -239,24 +239,29 @@ bool
ircd::net::dns::expired(const json::object &rr,
const time_t &rr_ts)
{
const seconds &min_seconds
{
cache::min_ttl
};
const seconds &err_seconds
{
cache::error_ttl
};
const time_t &min
const seconds base
{
is_error(rr)?
err_seconds.count():
min_seconds.count()
seconds(cache::error_ttl):
seconds(cache::min_ttl)
};
return expired(rr, rr_ts, min);
const pair<u64> perturb_range
{
1, base.count() / 3
};
const seconds perturb
{
rand::integer(perturb_range.first, perturb_range.second)
};
const seconds min
{
base + perturb
};
return expired(rr, rr_ts, min.count());
}
bool