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Fix tests

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Add a whole bunch of comments to document what we are trying to do.
This commit is contained in:
Miek Gieben
2017-08-19 10:45:19 +01:00
parent 118ef3dfa0
commit 4cbf015517
5 changed files with 68 additions and 53 deletions
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38
middleware/kubernetes/handler_test.go
View File

@@ -12,7 +12,6 @@ import (
)
var dnsTestCases = map[string](test.Case){
// *.any.svc-1-a.*.svc.cluster.local.,
"A Service": {
Qname: "svc1.testns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
@@ -24,29 +23,26 @@ var dnsTestCases = map[string](test.Case){
Qname: "svc1.*.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
test.A("svc1.*.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"SRV Service (wildcard)": {
Qname: "svc1.*.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{test.SRV("svc1.*.svc.cluster.local. 0 IN SRV 0 100 80 svc1.testns.svc.cluster.local.")},
Extra: []dns.RR{test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1")},
},
"SRV Service (wildcards)": {
Qname: "*.any.svc1.*.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
},
Answer: []dns.RR{test.SRV("*.any.svc1.*.svc.cluster.local. 0 IN SRV 0 100 80 svc1.testns.svc.cluster.local.")},
Extra: []dns.RR{test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1")},
},
"A Service (wildcards)": {
Qname: "*.any.svc1.*.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"A Service (Headless)": {
Qname: "hdls1.testns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("hdls1.testns.svc.cluster.local. 0 IN A 172.0.0.2"),
test.A("hdls1.testns.svc.cluster.local. 0 IN A 172.0.0.3"),
test.A("*.any.svc1.*.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"SRV Service": {
@@ -59,6 +55,14 @@ var dnsTestCases = map[string](test.Case){
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"A Service (Headless)": {
Qname: "hdls1.testns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("hdls1.testns.svc.cluster.local. 0 IN A 172.0.0.2"),
test.A("hdls1.testns.svc.cluster.local. 0 IN A 172.0.0.3"),
},
},
"SRV Service (Headless)": {
Qname: "_http._tcp.hdls1.testns.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
@@ -71,7 +75,6 @@ var dnsTestCases = map[string](test.Case){
test.A("172-0-0-3.hdls1.testns.svc.cluster.local. 0 IN A 172.0.0.3"),
},
},
// TODO A External
"CNAME External": {
Qname: "external.testns.svc.cluster.local.", Qtype: dns.TypeCNAME,
Rcode: dns.RcodeSuccess,
@@ -175,13 +178,12 @@ func TestServeDNS(t *testing.T) {
ctx := context.TODO()
runServeDNSTests(ctx, t, dnsTestCases, k)
//Set PodMode to Disabled
k.PodMode = PodModeDisabled
runServeDNSTests(ctx, t, podModeDisabledCases, k)
//Set PodMode to Insecure
k.PodMode = PodModeInsecure
runServeDNSTests(ctx, t, podModeInsecureCases, k)
//Set PodMode to Verified
k.PodMode = PodModeVerified
runServeDNSTests(ctx, t, podModeVerifiedCases, k)
}

12
middleware/kubernetes/kubernetes.go
View File

@@ -450,13 +450,19 @@ func (k *Kubernetes) findServices(r recordRequest) ([]kService, error) {
if ep.ObjectMeta.Name != svc.Name || ep.ObjectMeta.Namespace != svc.Namespace {
continue
}
for _, eps := range ep.Subsets {
for _, addr := range eps.Addresses {
for _, p := range eps.Ports {
ephostname := endpointHostname(addr)
if r.endpoint != "" && r.endpoint != ephostname {
// See comments in parse.go parseRequest about the endpoint handling.
if r.endpoint != "" {
if !match(r.endpoint, endpointHostname(addr)) {
continue
}
}
for _, p := range eps.Ports {
if !(match(r.port, p.Name) && match(r.protocol, string(p.Protocol))) {
continue
}

16
middleware/kubernetes/kubernetes_test.go
View File

@@ -217,24 +217,26 @@ func TestServices(t *testing.T) {
{qname: "external.testns.svc.interwebs.test.", qtype: dns.TypeCNAME, answer: svcAns{host: "coredns.io", key: "/coredns/test/interwebs/svc/testns/external"}},
}
for _, test := range tests {
for i, test := range tests {
state := request.Request{
Req: &dns.Msg{Question: []dns.Question{{Name: test.qname, Qtype: test.qtype}}},
Zone: "interwebs.test.", // must match from k.Zones[0]
}
svcs, _, e := k.Services(state, false, middleware.Options{})
if e != nil {
t.Errorf("Query '%v' got error '%v'", test.qname, e)
t.Errorf("Test %d: got error '%v'", i, e)
continue
}
if len(svcs) != 1 {
t.Errorf("Query %v %v: expected expected 1 answer, got %v", test.qname, dns.TypeToString[test.qtype], len(svcs))
} else {
t.Errorf("Test %d, expected expected 1 answer, got %v", i, len(svcs))
continue
}
if test.answer.host != svcs[0].Host {
t.Errorf("Query %v %v: expected host '%v', got '%v'", test.qname, dns.TypeToString[test.qtype], test.answer.host, svcs[0].Host)
t.Errorf("Test %d, expected host '%v', got '%v'", i, test.answer.host, svcs[0].Host)
}
if test.answer.key != svcs[0].Key {
t.Errorf("Query %v %v: expected key '%v', got '%v'", test.qname, dns.TypeToString[test.qtype], test.answer.key, svcs[0].Key)
}
t.Errorf("Test %d, expected key '%v', got '%v'", i, test.answer.key, svcs[0].Key)
}
}
}

47
middleware/kubernetes/parse.go
View File

@@ -24,15 +24,15 @@ type recordRequest struct {
}
// parseRequest parses the qname to find all the elements we need for querying k8s. Anything
// that is not parsed will have the wildcard "*" value. Potential underscores are stripped
// from _port and _protocol.
// that is not parsed will have the wildcard "*" value (except r.endpoint).
// Potential underscores are stripped from _port and _protocol.
func (k *Kubernetes) parseRequest(state request.Request) (r recordRequest, err error) {
// 3 Possible cases:
// o SRV Request: _port._protocol.service.namespace.pod|svc.zone
// o A Request (endpoint): endpoint.service.namespace.pod|svc.zone
// o A Request (service): service.namespace.pod|svc.zone
// 1. _port._protocol.service.namespace.pod|svc.zone
// 2. (endpoint): endpoint.service.namespace.pod|svc.zone
// 3. (service): service.namespace.pod|svc.zone
//
// Federations are handled in the federation middleware.
// Federations are handled in the federation middleware. And aren't parsed here.
base, _ := dnsutil.TrimZone(state.Name(), state.Zone)
segs := dns.SplitDomainName(base)
@@ -40,8 +40,9 @@ func (k *Kubernetes) parseRequest(state request.Request) (r recordRequest, err e
r.port = "*"
r.protocol = "*"
r.service = "*"
r.endpoint = "" // TODO(miek): dangerous; should just work with "*", but "" is checked in k.get()
r.namespace = "*"
// r.endpoint is the odd one out, we need to know if it has been set or not. If it is
// empty we should skip the endpoint check in k.get(). Hence we cannot set if to "*".
// start at the right and fill out recordRequest with the bits we find, so we look for
// pod|svc.namespace.service and then either
@@ -70,27 +71,31 @@ func (k *Kubernetes) parseRequest(state request.Request) (r recordRequest, err e
return r, nil
}
if segs[last][0] == '_' {
r.protocol = segs[last][1:]
} else {
// Becuase of ambiquity we check the labels left: 1: an endpoint. 2: port and protocol.
// Anything else is a query that is too long to answer and can safely be delegated to return an nxdomain.
switch last {
case 0: // endpoint only
r.endpoint = segs[last]
}
last--
if last < 0 {
return r, nil
}
case 1: // service and port
r.protocol = stripUnderscore(segs[last])
r.port = stripUnderscore(segs[last-1])
if segs[last][0] == '_' {
r.port = segs[last][1:]
}
if last > 0 { // Too long, so NXDOMAIN these.
default: // too long
return r, errInvalidRequest
}
return r, nil
}
// stripUnderscore removes a prefixed underscore from s.
func stripUnderscore(s string) string {
if s[0] != '_' {
return s
}
return s[1:]
}
// String return a string representation of r, it just returns all fields concatenated with dots.
// This is mostly used in tests.
func (r recordRequest) String() string {

2
middleware/kubernetes/parse_test.go
View File

@@ -24,7 +24,7 @@ func TestParseRequest(t *testing.T) {
{
// wildcard acceptance
"*.any.*.any.svc.inter.webs.test.", dns.TypeSRV,
"*.*.any.*.any.svc",
"*.any..*.any.svc",
},
{
// A request of endpoint