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Chore: reduce dhcp dns client cost

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Dreamacro
2022-08-24 21:36:19 +08:00
parent bf079742cb
commit a3281712e2
3 changed files with 44 additions and 35 deletions
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28
dns/resolver.go
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@ -10,7 +10,6 @@ import (
"time"
"github.com/Dreamacro/clash/common/cache"
"github.com/Dreamacro/clash/common/picker"
"github.com/Dreamacro/clash/component/fakeip"
"github.com/Dreamacro/clash/component/resolver"
"github.com/Dreamacro/clash/component/trie"
@ -187,31 +186,10 @@ func (r *Resolver) exchangeWithoutCache(ctx context.Context, m *D.Msg) (msg *D.M
}
func (r *Resolver) batchExchange(ctx context.Context, clients []dnsClient, m *D.Msg) (msg *D.Msg, err error) {
fast, ctx := picker.WithTimeout(ctx, resolver.DefaultDNSTimeout)
for _, client := range clients {
r := client
fast.Go(func() (any, error) {
m, err := r.ExchangeContext(ctx, m)
if err != nil {
return nil, err
} else if m.Rcode == D.RcodeServerFailure || m.Rcode == D.RcodeRefused {
return nil, errors.New("server failure")
}
return m, nil
})
}
ctx, cancel := context.WithTimeout(ctx, resolver.DefaultDNSTimeout)
defer cancel()
elm := fast.Wait()
if elm == nil {
err := errors.New("all DNS requests failed")
if fErr := fast.Error(); fErr != nil {
err = fmt.Errorf("%w, first error: %s", err, fErr.Error())
}
return nil, err
}
msg = elm.(*D.Msg)
return
return batchExchange(ctx, clients, m)
}
func (r *Resolver) matchPolicy(m *D.Msg) []dnsClient {