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-- SPDX-License-Identifier: GPL-3.0-or-later
-- Speculative prefetching for repetitive and soon-expiring records to reduce latency.
-- @module prefetch
local prefetch = {}
prefetch.layer = {
-- Prefetch all expiring (sub-)queries immediately after the request finishes.
-- Doing that immediately is simplest and avoids creating (new) large bursts of activity.
finish = function (_, req)
local qrys = req.rplan.resolved
for i = 0, (tonumber(qrys.len) - 1) do -- size_t doesn't work for some reason
local qry = qrys.at[i]
if qry.flags.EXPIRING == true then
resolve(kres.dname2str(qry.sname), qry.stype, qry.sclass, {'NO_CACHE'})
end
end
end
}
return prefetch
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