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plugin/cache: Add option to adjust SERVFAIL response cache TTL (#5320)

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* add servfail cache opt

Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
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Chris O'Haver 2022-06-17 15:48:57 -04:00 • committed by GitHub
parent d60ce0c8d4
commit dded10420b
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5 changed files with 78 additions and 2 deletions
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5
plugin/cache/cache.go vendored
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@ -32,6 +32,7 @@ type Cache struct {
pcap int
pttl time.Duration
minpttl time.Duration
failttl time.Duration // TTL for caching SERVFAIL responses
// Prefetch.
prefetch int
@ -59,6 +60,7 @@ func New() *Cache {
ncache: cache.New(defaultCap),
nttl: maxNTTL,
minnttl: minNTTL,
failttl: minNTTL,
prefetch: 0,
duration: 1 * time.Minute,
percentage: 10,
@ -158,8 +160,7 @@ func (w *ResponseWriter) WriteMsg(res *dns.Msg) error {
if mt == response.NameError || mt == response.NoData {
duration = computeTTL(msgTTL, w.minnttl, w.nttl)
} else if mt == response.ServerError {
// use default ttl which is 5s
duration = minTTL
duration = w.failttl
} else {
duration = computeTTL(msgTTL, w.minpttl, w.pttl)
}