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implement canary annotation and alternative backends

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Adds the ability to create alternative backends. Alternative backends enable
traffic shaping by sharing a single location but routing to different
backends depending on the TrafficShapingPolicy defined by AlternativeBackends.

When the list of upstreams and servers are retrieved, we then call
mergeAlternativeBackends which iterates through the paths of every ingress
and checks if the backend supporting the path is a AlternativeBackend. If
so, we then iterate through the map of servers and find the real backend
that the AlternativeBackend should fall under. Once found, the
AlternativeBackend is embedded in the list of VirtualBackends for the real
backend.

If no matching real backend for a AlternativeBackend is found, then the
AlternativeBackend is deleted as it cannot be backed by any server.
This commit is contained in:
Conor Landry 2018-09-18 14:05:32 -04:00
parent 5ceb723963
commit 412cd70d3a
18 changed files with 859 additions and 23 deletions
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179
internal/ingress/controller/controller_test.go
View file

@ -20,6 +20,7 @@ import (
"crypto/x509"
"crypto/x509/pkix"
"encoding/asn1"
"k8s.io/apimachinery/pkg/util/intstr"
"testing"
extensions "k8s.io/api/extensions/v1beta1"
@ -27,6 +28,184 @@ import (
"k8s.io/ingress-nginx/internal/ingress"
)
func TestMergeAlternativeBackends(t *testing.T) {
testCases := map[string]struct {
ingress *extensions.Ingress
upstreams map[string]*ingress.Backend
servers map[string]*ingress.Server
expNumAlternativeBackends int
expNumLocations int
}{
"alternative backend has no server and embeds into matching real backend": {
&extensions.Ingress{
ObjectMeta: metav1.ObjectMeta{
Namespace: "example",
},
Spec: extensions.IngressSpec{
Rules: []extensions.IngressRule{
{
Host: "example.com",
IngressRuleValue: extensions.IngressRuleValue{
HTTP: &extensions.HTTPIngressRuleValue{
Paths: []extensions.HTTPIngressPath{
{
Path: "/",
Backend: extensions.IngressBackend{
ServiceName: "http-svc-canary",
ServicePort: intstr.IntOrString{
Type: intstr.Int,
IntVal: 80,
},
},
},
},
},
},
},
},
},
},
map[string]*ingress.Backend{
"example-http-svc-80": {
Name: "example-http-svc-80",
NoServer: false,
},
"example-http-svc-canary-80": {
Name: "example-http-svc-canary-80",
NoServer: true,
TrafficShapingPolicy: ingress.TrafficShapingPolicy{
Weight: 20,
},
},
},
map[string]*ingress.Server{
"example.com": {
Hostname: "example.com",
Locations: []*ingress.Location{
{
Path: "/",
Backend: "example-http-svc-80",
},
},
},
},
1,
1,
},
"merging a alternative backend matches with the correct host": {
&extensions.Ingress{
ObjectMeta: metav1.ObjectMeta{
Namespace: "example",
},
Spec: extensions.IngressSpec{
Rules: []extensions.IngressRule{
{
Host: "foo.bar",
IngressRuleValue: extensions.IngressRuleValue{
HTTP: &extensions.HTTPIngressRuleValue{
Paths: []extensions.HTTPIngressPath{
{
Path: "/",
Backend: extensions.IngressBackend{
ServiceName: "foo-http-svc-canary",
ServicePort: intstr.IntOrString{
Type: intstr.Int,
IntVal: 80,
},
},
},
},
},
},
},
{
Host: "example.com",
IngressRuleValue: extensions.IngressRuleValue{
HTTP: &extensions.HTTPIngressRuleValue{
Paths: []extensions.HTTPIngressPath{
{
Path: "/",
Backend: extensions.IngressBackend{
ServiceName: "http-svc-canary",
ServicePort: intstr.IntOrString{
Type: intstr.Int,
IntVal: 80,
},
},
},
},
},
},
},
},
},
},
map[string]*ingress.Backend{
"example-foo-http-svc-80": {
Name: "example-foo-http-svc-80",
NoServer: false,
},
"example-foo-http-svc-canary-80": {
Name: "example-foo-http-svc-canary-80",
NoServer: true,
TrafficShapingPolicy: ingress.TrafficShapingPolicy{
Weight: 20,
},
},
"example-http-svc-80": {
Name: "example-http-svc-80",
NoServer: false,
},
"example-http-svc-canary-80": {
Name: "example-http-svc-canary-80",
NoServer: true,
TrafficShapingPolicy: ingress.TrafficShapingPolicy{
Weight: 20,
},
},
},
map[string]*ingress.Server{
"foo.bar": {
Hostname: "foo.bar",
Locations: []*ingress.Location{
{
Path: "/",
Backend: "example-foo-http-svc-80",
},
},
},
"example.com": {
Hostname: "example.com",
Locations: []*ingress.Location{
{
Path: "/",
Backend: "example-http-svc-80",
},
},
},
},
1,
1,
},
}
for title, tc := range testCases {
t.Run(title, func(t *testing.T) {
mergeAlternativeBackends(tc.ingress, tc.upstreams, tc.servers)
numAlternativeBackends := len(tc.upstreams["example-http-svc-80"].AlternativeBackends)
if numAlternativeBackends != tc.expNumAlternativeBackends {
t.Errorf("expected %d alternative backends (got %d)", tc.expNumAlternativeBackends, numAlternativeBackends)
}
numLocations := len(tc.servers["example.com"].Locations)
if numLocations != tc.expNumLocations {
t.Errorf("expected %d locations (got %d)", tc.expNumLocations, numLocations)
}
})
}
}
func TestExtractTLSSecretName(t *testing.T) {
testCases := map[string]struct {
host string