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fix: reset timeout in exchangeWithoutCache's singleflight

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This commit is contained in:
wwqgtxx 2022-11-18 18:02:46 +08:00
parent 2dc62024fe
commit 8b848b62bb
1 changed files with 19 additions and 1 deletions
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20
dns/resolver.go
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@ -187,7 +187,10 @@ func (r *Resolver) ExchangeContext(ctx context.Context, m *D.Msg) (msg *D.Msg, e
func (r *Resolver) exchangeWithoutCache(ctx context.Context, m *D.Msg) (msg *D.Msg, err error) {
q := m.Question[0]
ret, err, shared := r.group.Do(q.String(), func() (result any, err error) {
ch := r.group.DoChan(q.String(), func() (result any, err error) {
ctx, cancel := context.WithTimeout(context.Background(), resolver.DefaultDNSTimeout) // reset timeout in singleflight
defer cancel()
defer func() {
if err != nil {
return
@ -209,6 +212,21 @@ func (r *Resolver) exchangeWithoutCache(ctx context.Context, m *D.Msg) (msg *D.M
return r.batchExchange(ctx, r.main, m)
})
var result singleflight.Result
select {
case result = <-ch:
break
case <-ctx.Done():
select {
case result = <-ch:
break
}
return nil, ctx.Err()
}
ret, err, shared := result.Val, result.Err, result.Shared
if err == nil {
msg = ret.(*D.Msg)
if shared {