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Allow debug queries to etcd middleware (#150)

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With this you can retreive the raw data that the etcd middleware
used to create the reply. The debug data is put in TXT records
that are stuffed in the CH classs. This is only enabled if you
specify `debug` in the etcd stanza.

You can retrieve it by prefixing your query with 'o-o.debug.'
For instance:

; <<>> DiG 9.10.3-P4-Ubuntu <<>> @localhost -p 1053 SRV o-o.debug.production.*.skydns.local
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47798
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 3

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;o-o.debug.production.*.skydns.local. IN	SRV

;; ANSWER SECTION:
production.*.skydns.local. 154	IN	SRV	10 50 8080 service1.example.com.
production.*.skydns.local. 154	IN	SRV	10 50 8080 service2.example.com.

;; ADDITIONAL SECTION:
skydns.local.skydns.east.production.rails.1. 154 CH TXT	"service1.example.com:8080(10,0,,false)[0,]"
skydns.local.skydns.west.production.rails.2. 154 CH TXT	"service2.example.com:8080(10,0,,false)[0,]"
This commit is contained in:
Miek Gieben
2016-05-22 21:16:26 +01:00
parent d35394a8df
commit c30671f4c0
9 changed files with 323 additions and 62 deletions
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4
middleware/state.go
View File

@@ -190,7 +190,8 @@ func (s *State) Type() string { return dns.Type(s.Req.Question[0].Qtype).String(
func (s *State) QType() uint16 { return s.Req.Question[0].Qtype }
// Name returns the name of the question in the request. Note
// this name will always have a closing dot and will be lower cased.
// this name will always have a closing dot and will be lower cased. After a call Name
// the value will be cached. To clear this caching call Clear.
func (s *State) Name() string {
if s.name != "" {
return s.name
@@ -222,6 +223,7 @@ func (s *State) Clear() {
}
const (
// TODO(miek): make this less awkward.
doTrue = 1
doFalse = 2
)