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mw/kubernetes: autopath refactors (#850)

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Factor out as much of autopath into a subpackage as possible right now.
apw.Sent is not needed, we should see this from the rcode returned by
the middleware. See #852 on why this was needed.

Disable the tests for now as to not break the main build.
This commit is contained in:
Miek Gieben
2017-08-07 14:45:30 -07:00
committed by GitHub
parent e1c1521ad5
commit 0bc1ff7408
7 changed files with 226 additions and 210 deletions
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36
middleware/kubernetes/autopath/autopath.go
View File

@@ -1,6 +1,10 @@
package autopath
import "github.com/miekg/dns"
import (
"strings"
"github.com/miekg/dns"
)
// Writer implements a ResponseWriter that also does the following:
// * reverts question section of a packet to its original state.
@@ -18,7 +22,6 @@ type Writer struct {
dns.ResponseWriter
original dns.Question
Rcode int
Sent bool
}
// AutoPath enables server side search path lookups for pods.
@@ -40,24 +43,10 @@ func NewWriter(w dns.ResponseWriter, r *dns.Msg) *Writer {
// WriteMsg writes to client, unless response will be NXDOMAIN.
func (apw *Writer) WriteMsg(res *dns.Msg) error {
return apw.overrideMsg(res, false)
}
// ForceWriteMsg forces the write to client regardless of response code.
func (apw *Writer) ForceWriteMsg(res *dns.Msg) error {
return apw.overrideMsg(res, true)
}
// overrideMsg overrides rcode, reverts question, adds CNAME, and calls the
// underlying ResponseWriter's WriteMsg method unless the write is deferred,
// or force = true.
func (apw *Writer) overrideMsg(res *dns.Msg, force bool) error {
if res.Rcode == dns.RcodeNameError {
res.Rcode = apw.Rcode
}
if res.Rcode != dns.RcodeSuccess && !force {
return nil
}
for _, a := range res.Answer {
if apw.original.Name == a.Header().Name {
continue
@@ -67,7 +56,7 @@ func (apw *Writer) overrideMsg(res *dns.Msg, force bool) error {
res.Answer[0] = CNAME(apw.original.Name, a.Header().Name, a.Header().Ttl)
}
res.Question[0] = apw.original
apw.Sent = true
return apw.ResponseWriter.WriteMsg(res)
}
@@ -77,9 +66,10 @@ func (apw *Writer) Write(buf []byte) (int, error) {
return n, err
}
// Hijack implements dns.Hijacker. It simply wraps the underlying
// ResponseWriter's Hijack method if there is one, or returns an error.
func (apw *Writer) Hijack() {
apw.ResponseWriter.Hijack()
return
func SplitSearch(zone, question, namespace string) (name, search string, ok bool) {
search = strings.Join([]string{namespace, "svc", zone}, ".")
if dns.IsSubDomain(search, question) {
return question[:len(question)-len(search)-1], search, true
}
return "", "", false
}

26
middleware/kubernetes/autopath/autopath_test.go Normal file
View File

@@ -0,0 +1,26 @@
package autopath
import "testing"
func TestSplitSearchPath(t *testing.T) {
type testCase struct {
question string
namespace string
expectedName string
expectedSearch string
expectedOk bool
}
tests := []testCase{
{question: "test.blah.com", namespace: "ns1", expectedName: "", expectedSearch: "", expectedOk: false},
{question: "foo.com.ns2.svc.interwebs.nets", namespace: "ns1", expectedName: "", expectedSearch: "", expectedOk: false},
{question: "foo.com.svc.interwebs.nets", namespace: "ns1", expectedName: "", expectedSearch: "", expectedOk: false},
{question: "foo.com.ns1.svc.interwebs.nets", namespace: "ns1", expectedName: "foo.com", expectedSearch: "ns1.svc.interwebs.nets", expectedOk: true},
}
zone := "interwebs.nets"
for _, c := range tests {
name, search, ok := SplitSearch(zone, c.question, c.namespace)
if c.expectedName != name || c.expectedSearch != search || c.expectedOk != ok {
t.Errorf("Case %v: Expected name'%v', search:'%v', ok:'%v'. Got name:'%v', search:'%v', ok:'%v'.", c.question, c.expectedName, c.expectedSearch, c.expectedOk, name, search, ok)
}
}
}