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Cleanup: put middleware helper functions in pkgs (#245)

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Move all (almost all) Go files in middleware into their
own packages. This makes for better naming and discoverability.

Lot of changes elsewhere to make this change.

The middleware.State was renamed to request.Request which is better,
but still does not cover all use-cases. It was also moved out middleware
because it is used by `dnsserver` as well.

A pkg/dnsutil packages was added for shared, handy, dns util functions.

All normalize functions are now put in normalize.go
This commit is contained in:
Miek Gieben
2016-09-07 11:10:16 +01:00
committed by GitHub
parent 684330fd28
commit d1f17fa7e0
90 changed files with 680 additions and 1037 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
middleware/etcd/lookup.go
View File

@@ -8,6 +8,8 @@ import (
"github.com/miekg/coredns/middleware"
"github.com/miekg/coredns/middleware/etcd/msg"
"github.com/miekg/coredns/middleware/pkg/dnsutil"
"github.com/miekg/coredns/request"
"github.com/miekg/dns"
)
@@ -16,7 +18,7 @@ type Options struct {
Debug string
}
func (e Etcd) records(state middleware.State, exact bool, opt Options) (services, debug []msg.Service, err error) {
func (e Etcd) records(state request.Request, exact bool, opt Options) (services, debug []msg.Service, err error) {
services, err = e.Records(state.Name(), exact)
if err != nil {
return
@@ -28,7 +30,7 @@ func (e Etcd) records(state middleware.State, exact bool, opt Options) (services
return
}
func (e Etcd) A(zone string, state middleware.State, previousRecords []dns.RR, opt Options) (records []dns.RR, debug []msg.Service, err error) {
func (e Etcd) A(zone string, state request.Request, previousRecords []dns.RR, opt Options) (records []dns.RR, debug []msg.Service, err error) {
services, debug, err := e.records(state, false, opt)
if err != nil {
return nil, debug, err
@@ -49,11 +51,11 @@ func (e Etcd) A(zone string, state middleware.State, previousRecords []dns.RR, o
// don't add it, and just continue
continue
}
if isDuplicateCNAME(newRecord, previousRecords) {
if dnsutil.DuplicateCNAME(newRecord, previousRecords) {
continue
}
state1 := copyState(state, serv.Host, state.QType())
state1 := state.NewWithQuestion(serv.Host, state.QType())
nextRecords, nextDebug, err := e.A(zone, state1, append(previousRecords, newRecord), opt)
if err == nil {
@@ -90,7 +92,7 @@ func (e Etcd) A(zone string, state middleware.State, previousRecords []dns.RR, o
return records, debug, nil
}
func (e Etcd) AAAA(zone string, state middleware.State, previousRecords []dns.RR, opt Options) (records []dns.RR, debug []msg.Service, err error) {
func (e Etcd) AAAA(zone string, state request.Request, previousRecords []dns.RR, opt Options) (records []dns.RR, debug []msg.Service, err error) {
services, debug, err := e.records(state, false, opt)
if err != nil {
return nil, debug, err
@@ -111,11 +113,11 @@ func (e Etcd) AAAA(zone string, state middleware.State, previousRecords []dns.RR
// don't add it, and just continue
continue
}
if isDuplicateCNAME(newRecord, previousRecords) {
if dnsutil.DuplicateCNAME(newRecord, previousRecords) {
continue
}
state1 := copyState(state, serv.Host, state.QType())
state1 := state.NewWithQuestion(serv.Host, state.QType())
nextRecords, nextDebug, err := e.AAAA(zone, state1, append(previousRecords, newRecord), opt)
if err == nil {
@@ -155,7 +157,7 @@ func (e Etcd) AAAA(zone string, state middleware.State, previousRecords []dns.RR
// SRV returns SRV records from etcd.
// If the Target is not a name but an IP address, a name is created on the fly.
func (e Etcd) SRV(zone string, state middleware.State, opt Options) (records, extra []dns.RR, debug []msg.Service, err error) {
func (e Etcd) SRV(zone string, state request.Request, opt Options) (records, extra []dns.RR, debug []msg.Service, err error) {
services, debug, err := e.records(state, false, opt)
if err != nil {
return nil, nil, nil, err
@@ -220,7 +222,7 @@ func (e Etcd) SRV(zone string, state middleware.State, opt Options) (records, ex
}
// Internal name, we should have some info on them, either v4 or v6
// Clients expect a complete answer, because we are a recursor in their view.
state1 := copyState(state, srv.Target, dns.TypeA)
state1 := state.NewWithQuestion(srv.Target, dns.TypeA)
addr, debugAddr, e1 := e.A(zone, state1, nil, opt)
if e1 == nil {
extra = append(extra, addr...)
@@ -246,7 +248,7 @@ func (e Etcd) SRV(zone string, state middleware.State, opt Options) (records, ex
// MX returns MX records from etcd.
// If the Target is not a name but an IP address, a name is created on the fly.
func (e Etcd) MX(zone string, state middleware.State, opt Options) (records, extra []dns.RR, debug []msg.Service, err error) {
func (e Etcd) MX(zone string, state request.Request, opt Options) (records, extra []dns.RR, debug []msg.Service, err error) {
services, debug, err := e.records(state, false, opt)
if err != nil {
return nil, nil, debug, err
@@ -291,7 +293,7 @@ func (e Etcd) MX(zone string, state middleware.State, opt Options) (records, ext
break
}
// Internal name
state1 := copyState(state, mx.Mx, dns.TypeA)
state1 := state.NewWithQuestion(mx.Mx, dns.TypeA)
addr, debugAddr, e1 := e.A(zone, state1, nil, opt)
if e1 == nil {
extra = append(extra, addr...)
@@ -311,7 +313,7 @@ func (e Etcd) MX(zone string, state middleware.State, opt Options) (records, ext
return records, extra, debug, nil
}
func (e Etcd) CNAME(zone string, state middleware.State, opt Options) (records []dns.RR, debug []msg.Service, err error) {
func (e Etcd) CNAME(zone string, state request.Request, opt Options) (records []dns.RR, debug []msg.Service, err error) {
services, debug, err := e.records(state, true, opt)
if err != nil {
return nil, debug, err
@@ -327,7 +329,7 @@ func (e Etcd) CNAME(zone string, state middleware.State, opt Options) (records [
}
// PTR returns the PTR records, only services that have a domain name as host are included.
func (e Etcd) PTR(zone string, state middleware.State, opt Options) (records []dns.RR, debug []msg.Service, err error) {
func (e Etcd) PTR(zone string, state request.Request, opt Options) (records []dns.RR, debug []msg.Service, err error) {
services, debug, err := e.records(state, true, opt)
if err != nil {
return nil, debug, err
@@ -341,7 +343,7 @@ func (e Etcd) PTR(zone string, state middleware.State, opt Options) (records []d
return records, debug, nil
}
func (e Etcd) TXT(zone string, state middleware.State, opt Options) (records []dns.RR, debug []msg.Service, err error) {
func (e Etcd) TXT(zone string, state request.Request, opt Options) (records []dns.RR, debug []msg.Service, err error) {
services, debug, err := e.records(state, false, opt)
if err != nil {
return nil, debug, err
@@ -356,7 +358,7 @@ func (e Etcd) TXT(zone string, state middleware.State, opt Options) (records []d
return records, debug, nil
}
func (e Etcd) NS(zone string, state middleware.State, opt Options) (records, extra []dns.RR, debug []msg.Service, err error) {
func (e Etcd) NS(zone string, state request.Request, opt Options) (records, extra []dns.RR, debug []msg.Service, err error) {
// NS record for this zone live in a special place, ns.dns.<zone>. Fake our lookup.
// only a tad bit fishy...
old := state.QName()
@@ -389,7 +391,7 @@ func (e Etcd) NS(zone string, state middleware.State, opt Options) (records, ext
}
// SOA Record returns a SOA record.
func (e Etcd) SOA(zone string, state middleware.State, opt Options) ([]dns.RR, []msg.Service, error) {
func (e Etcd) SOA(zone string, state request.Request, opt Options) ([]dns.RR, []msg.Service, error) {
header := dns.RR_Header{Name: zone, Rrtype: dns.TypeSOA, Ttl: 300, Class: dns.ClassINET}
soa := &dns.SOA{Hdr: header,
@@ -404,21 +406,3 @@ func (e Etcd) SOA(zone string, state middleware.State, opt Options) ([]dns.RR, [
// TODO(miek): fake some msg.Service here when returning.
return []dns.RR{soa}, nil, nil
}
func isDuplicateCNAME(r *dns.CNAME, records []dns.RR) bool {
for _, rec := range records {
if v, ok := rec.(*dns.CNAME); ok {
if v.Target == r.Target {
return true
}
}
}
return false
}
// TODO(miek): Move to middleware?
func copyState(state middleware.State, target string, typ uint16) middleware.State {
state1 := middleware.State{W: state.W, Req: state.Req.Copy()}
state1.Req.Question[0] = dns.Question{Name: dns.Fqdn(target), Qclass: dns.ClassINET, Qtype: typ}
return state1
}