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Suggest using stale DNS cache when queries are slow

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Daniel
2023-04-24 13:13:24 +02:00
parent f6d90b008a
commit 89bad684cf
6 changed files with 132 additions and 2 deletions
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8
resolver/resolver-plain.go
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@@ -37,6 +37,8 @@ func NewPlainResolver(resolver *Resolver) *PlainResolver {
// Query executes the given query against the resolver.
func (pr *PlainResolver) Query(ctx context.Context, q *Query) (*RRCache, error) {
queryStarted := time.Now()
// create query
dnsQuery := new(dns.Msg)
dnsQuery.SetQuestion(q.FQDN, uint16(q.QType))
@@ -54,6 +56,7 @@ func (pr *PlainResolver) Query(ctx context.Context, q *Query) (*RRCache, error)
// create client
dnsClient := &dns.Client{
UDPSize: 1024,
Timeout: timeout,
Dialer: &net.Dialer{
Timeout: timeout,
@@ -80,9 +83,12 @@ func (pr *PlainResolver) Query(ctx context.Context, q *Query) (*RRCache, error)
return nil, &BlockedUpstreamError{pr.resolver.Info.DescriptiveName()}
}
// hint network environment at successful connection
// Hint network environment at successful connection.
netenv.ReportSuccessfulConnection()
// Report request duration for metrics.
reportRequestDuration(queryStarted, pr.resolver)
newRecord := &RRCache{
Domain: q.FQDN,
Question: q.QType,