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zabov
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if the DNS response Rcode contains an error the cache expires after just 10 seconds. 

this should limit the cache in case of temporary upstream DNS errors.
This commit is contained in:
bloved 2021-09-16 09:40:03 +02:00
parent 2fe0b7b0c2
commit e2a625a92e
1 changed files with 17 additions and 4 deletions
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21
02.cache.go
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@ -13,7 +13,7 @@ import (
type cacheItem struct {
Query []byte
Date time.Time
ExpireDate time.Time
}
//DomainCache stores a domain name inside the cache
@ -28,7 +28,17 @@ func DomainCache(s string, resp *dns.Msg) {
if err != nil {
fmt.Println("Problems packing the response: ", err.Error())
}
domain2cache.Date = time.Now()
if resp.Rcode == dns.RcodeSuccess{
// on success stores response normally
domain2cache.ExpireDate = time.Now().Add((time.Duration(ZabovCacheTTL) * time.Hour))
}else
{
// on failure stores response for a very short time
if ZabovDebug {
fmt.Println("DomainCache(): DNS error Rcode: ", resp.Rcode, s, "cache time reduced to 10 seconds...")
}
domain2cache.ExpireDate = time.Now().Add((time.Duration(10) * time.Second))
}
err = enc.Encode(domain2cache)
@ -65,7 +75,7 @@ func GetDomainFromCache(s string) *dns.Msg {
conf, errDB = MyZabovCDB.Get([]byte(s), nil)
if errDB != nil {
fmt.Println("Cant READ DB :" , errDB.Error() )
fmt.Println("Cant READ DB:" , errDB.Error() )
return nil
}
@ -77,7 +87,10 @@ func GetDomainFromCache(s string) *dns.Msg {
return nil
}
if time.Since(record.Date) > (time.Duration(ZabovCacheTTL) * time.Hour) {
if time.Now().After(record.ExpireDate) {
if ZabovDebug {
fmt.Println("GetDomainFromCache(): entry expired:", s)
}
return nil
}