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2d106be341
* core/dnsserver: add Config.UDPDecorateWriterFunc for external plugins
Allow external plugins to install a dns.DecorateWriter (an existing
miekg/dns Server field CoreDNS never sets) on plain-UDP servers, e.g.
for per-socket write disciplines or overload protection; UDP is the
only transport without a Max*-style concurrency setting.
The field is a factory called once per Server in ServePacket, so each
socket gets its own decorator under multisocket; the *Server argument
is the same value handlers see via ctx.Value(dnsserver.Key{}). Follows
the Config.HTTPRequestValidateFunc precedent, including server-block
propagation and the ServePacket-time lookup over s.zones. Nil (the
default) changes nothing.
Signed-off-by: Ryan Brewster <rpb@anthropic.com>
* core/dnsserver: select UDP writer decorator deterministically in NewServer
Review feedback: s.zones is a map, so choosing the decorator in
ServePacket was non-deterministic when several server blocks share a
listener. Select it in NewServer from the group slice instead (stable
config order, last one set wins) and document the resolution order.
Signed-off-by: Ryan Brewster <rpb@anthropic.com>
* core/dnsserver: group decorator selection with the other last-writer-wins fields
Pure move: place it next to ProxyProtoConnPolicy, the existing field
resolved the same way at the same point.
Signed-off-by: Ryan Brewster <rpb@anthropic.com>
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Signed-off-by: Ryan Brewster <rpb@anthropic.com>