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more pretty logging and ensure query the specific upstream nameserver in async Lookup() function.

This commit is contained in:
kenshinx 2018-02-01 18:30:41 +08:00
parent 063182e0bd
commit 4b1d61a600
1 changed files with 19 additions and 12 deletions
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31
resolver.go
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@ -23,6 +23,12 @@ func (e ResolvError) Error() string {
return errmsg
}
type RResp struct {
msg *dns.Msg
nameserver string
rtt time.Duration
}
type Resolver struct {
servers []string
domain_server *suffixTreeNode
@ -126,7 +132,7 @@ func (r *Resolver) Lookup(net string, req *dns.Msg) (message *dns.Msg, err error
qname := req.Question[0].Name
res := make(chan *dns.Msg, 1)
res := make(chan *RResp, 1)
var wg sync.WaitGroup
L := func(nameserver string) {
defer wg.Done()
@ -145,11 +151,10 @@ func (r *Resolver) Lookup(net string, req *dns.Msg) (message *dns.Msg, err error
if r.Rcode == dns.RcodeServerFailure {
return
}
} else {
logger.Debug("%s resolv on %s (%s) ttl: %v", UnFqdn(qname), nameserver, net, rtt)
}
re := &RResp{r, nameserver, rtt}
select {
case res <- r:
case res <- re:
default:
}
}
@ -163,9 +168,9 @@ func (r *Resolver) Lookup(net string, req *dns.Msg) (message *dns.Msg, err error
go L(nameserver)
// but exit early, if we have an answer
select {
case r := <-res:
// logger.Debug("%s resolv on %s rtt: %v", UnFqdn(qname), nameserver, rtt)
return r, nil
case re := <-res:
logger.Debug("%s resolv on %s rtt: %v", UnFqdn(qname), re.nameserver, re.rtt)
return re.msg, nil
case <-ticker.C:
continue
}
@ -173,9 +178,9 @@ func (r *Resolver) Lookup(net string, req *dns.Msg) (message *dns.Msg, err error
// wait for all the namservers to finish
wg.Wait()
select {
case r := <-res:
// logger.Debug("%s resolv on %s rtt: %v", UnFqdn(qname), nameserver, rtt)
return r, nil
case re := <-res:
logger.Debug("%s resolv on %s rtt: %v", UnFqdn(qname), re.nameserver, re.rtt)
return re.msg, nil
default:
return nil, ResolvError{qname, net, nameservers}
}
@ -190,10 +195,12 @@ func (r *Resolver) Nameservers(qname string) []string {
ns := []string{}
if v, found := r.domain_server.search(queryKeys); found {
logger.Debug("found upstream: %v", v)
logger.Debug("%s be found in domain server list, upstream: %v", qname, v)
server := v
nameserver := server + ":53"
nameserver := net.JoinHostPort(server, "53")
ns = append(ns, nameserver)
//Ensure query the specific upstream nameserver in async Lookup() function.
return ns
}
for _, nameserver := range r.servers {