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plugin/cache: unroll minTTL loop (#1773)

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This allocates memory because of the append, just unroll the loop.
Also add benchmark.

Before:
goos: linux
goarch: amd64
pkg: github.com/coredns/coredns/plugin/cache
BenchmarkCacheResponse-4   	  100000	     11910 ns/op
BenchmarkMinMsgTTL-4       	 1000000	      1494 ns/op
PASS

After:
goos: linux
goarch: amd64
pkg: github.com/coredns/coredns/plugin/cache
BenchmarkCacheResponse-4   	  100000	     12016 ns/op
BenchmarkMinMsgTTL-4       	 2000000	       668 ns/op
PASS
This commit is contained in:
Miek Gieben
2018-05-08 18:36:29 +01:00
committed by GitHub
parent 565e416407
commit 68b45f5377
2 changed files with 57 additions and 2 deletions
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29
plugin/cache/item.go vendored
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@@ -99,7 +99,32 @@ func minMsgTTL(m *dns.Msg, mt response.Type) time.Duration {
}
minTTL := maxTTL
for _, r := range append(append(m.Answer, m.Ns...), m.Extra...) {
for _, r := range m.Answer {
switch mt {
case response.NameError, response.NoData:
if r.Header().Rrtype == dns.TypeSOA {
minTTL = time.Duration(r.(*dns.SOA).Minttl) * time.Second
}
case response.NoError, response.Delegation:
if r.Header().Ttl < uint32(minTTL.Seconds()) {
minTTL = time.Duration(r.Header().Ttl) * time.Second
}
}
}
for _, r := range m.Ns {
switch mt {
case response.NameError, response.NoData:
if r.Header().Rrtype == dns.TypeSOA {
minTTL = time.Duration(r.(*dns.SOA).Minttl) * time.Second
}
case response.NoError, response.Delegation:
if r.Header().Ttl < uint32(minTTL.Seconds()) {
minTTL = time.Duration(r.Header().Ttl) * time.Second
}
}
}
for _, r := range m.Extra {
if r.Header().Rrtype == dns.TypeOPT {
// OPT records use TTL field for extended rcode and flags
continue
@@ -107,7 +132,7 @@ func minMsgTTL(m *dns.Msg, mt response.Type) time.Duration {
switch mt {
case response.NameError, response.NoData:
if r.Header().Rrtype == dns.TypeSOA {
return time.Duration(r.(*dns.SOA).Minttl) * time.Second
minTTL = time.Duration(r.(*dns.SOA).Minttl) * time.Second
}
case response.NoError, response.Delegation:
if r.Header().Ttl < uint32(minTTL.Seconds()) {