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VictoriaMetrics/lib/promscrape/discovery/kubernetes/api_watcher_test.go
Aliaksandr Valialkin be6da5053f
lib/promscrape: optimize service discovery speed 
- Return meta-labels for the discovered targets via promutils.Labels
  instead of map[string]string. This improves the speed of generating
  meta-labels for discovered targets by up to 5x.

- Remove memory allocations in hot paths during ScrapeWork generation.
  The ScrapeWork contains scrape settings for a single discovered target.
  This improves the service discovery speed by up to 2x.
2022-11-29 21:26:23 -08:00

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package kubernetes
import (
"encoding/json"
"net/http"
"net/http/httptest"
"reflect"
"sync"
"testing"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promutils"
)
func TestGetAPIPathsWithNamespaces(t *testing.T) {
f := func(role string, namespaces []string, selectors []Selector, expectedPaths []string) {
t.Helper()
paths := getAPIPathsWithNamespaces(role, namespaces, selectors)
if !reflect.DeepEqual(paths, expectedPaths) {
t.Fatalf("unexpected paths; got\n%q\nwant\n%q", paths, expectedPaths)
}
}
// role=node
f("node", nil, nil, []string{"/api/v1/nodes"})
f("node", []string{"foo", "bar"}, nil, []string{"/api/v1/nodes"})
f("node", nil, []Selector{
{
Role: "pod",
Label: "foo",
Field: "bar",
},
}, []string{"/api/v1/nodes"})
f("node", nil, []Selector{
{
Role: "node",
Label: "foo",
Field: "bar",
},
}, []string{"/api/v1/nodes?labelSelector=foo&fieldSelector=bar"})
f("node", []string{"x", "y"}, []Selector{
{
Role: "node",
Label: "foo",
Field: "bar",
},
}, []string{"/api/v1/nodes?labelSelector=foo&fieldSelector=bar"})
// role=pod
f("pod", nil, nil, []string{"/api/v1/pods"})
f("pod", []string{"foo", "bar"}, nil, []string{
"/api/v1/namespaces/foo/pods",
"/api/v1/namespaces/bar/pods",
})
f("pod", nil, []Selector{
{
Role: "node",
Label: "foo",
},
}, []string{"/api/v1/pods"})
f("pod", nil, []Selector{
{
Role: "pod",
Label: "foo",
},
{
Role: "pod",
Label: "x",
Field: "y",
},
}, []string{"/api/v1/pods?labelSelector=foo%2Cx&fieldSelector=y"})
f("pod", []string{"x", "y"}, []Selector{
{
Role: "pod",
Label: "foo",
},
{
Role: "pod",
Label: "x",
Field: "y",
},
}, []string{
"/api/v1/namespaces/x/pods?labelSelector=foo%2Cx&fieldSelector=y",
"/api/v1/namespaces/y/pods?labelSelector=foo%2Cx&fieldSelector=y",
})
// role=service
f("service", nil, nil, []string{"/api/v1/services"})
f("service", []string{"x", "y"}, nil, []string{
"/api/v1/namespaces/x/services",
"/api/v1/namespaces/y/services",
})
f("service", nil, []Selector{
{
Role: "node",
Label: "foo",
},
{
Role: "service",
Field: "bar",
},
}, []string{"/api/v1/services?fieldSelector=bar"})
f("service", []string{"x", "y"}, []Selector{
{
Role: "service",
Label: "abc=de",
},
}, []string{
"/api/v1/namespaces/x/services?labelSelector=abc%3Dde",
"/api/v1/namespaces/y/services?labelSelector=abc%3Dde",
})
// role=endpoints
f("endpoints", nil, nil, []string{"/api/v1/endpoints"})
f("endpoints", []string{"x", "y"}, nil, []string{
"/api/v1/namespaces/x/endpoints",
"/api/v1/namespaces/y/endpoints",
})
f("endpoints", []string{"x", "y"}, []Selector{
{
Role: "endpoints",
Label: "bbb",
},
{
Role: "node",
Label: "aa",
},
}, []string{
"/api/v1/namespaces/x/endpoints?labelSelector=bbb",
"/api/v1/namespaces/y/endpoints?labelSelector=bbb",
})
// role=endpointslice
f("endpointslice", nil, nil, []string{"/apis/discovery.k8s.io/v1/endpointslices"})
f("endpointslice", []string{"x", "y"}, []Selector{
{
Role: "endpointslice",
Field: "field",
Label: "label",
},
}, []string{
"/apis/discovery.k8s.io/v1/namespaces/x/endpointslices?labelSelector=label&fieldSelector=field",
"/apis/discovery.k8s.io/v1/namespaces/y/endpointslices?labelSelector=label&fieldSelector=field",
})
// role=ingress
f("ingress", nil, nil, []string{"/apis/networking.k8s.io/v1/ingresses"})
f("ingress", []string{"x", "y"}, []Selector{
{
Role: "node",
Field: "xyay",
},
{
Role: "ingress",
Field: "abc",
},
{
Role: "ingress",
Label: "cde",
},
{
Role: "ingress",
Label: "baaa",
},
}, []string{
"/apis/networking.k8s.io/v1/namespaces/x/ingresses?labelSelector=cde%2Cbaaa&fieldSelector=abc",
"/apis/networking.k8s.io/v1/namespaces/y/ingresses?labelSelector=cde%2Cbaaa&fieldSelector=abc",
})
}
func TestParseBookmark(t *testing.T) {
data := `{"kind": "Pod", "apiVersion": "v1", "metadata": {"resourceVersion": "12746"} }`
bm, err := parseBookmark([]byte(data))
if err != nil {
t.Fatalf("unexpected error: %s", err)
}
expectedResourceVersion := "12746"
if bm.Metadata.ResourceVersion != expectedResourceVersion {
t.Fatalf("unexpected resourceVersion; got %q; want %q", bm.Metadata.ResourceVersion, expectedResourceVersion)
}
}
func TestGetScrapeWorkObjects(t *testing.T) {
type testCase struct {
name string
sdc *SDConfig
expectedTargetsLen int
initAPIObjectsByRole map[string][]byte
// will be added for watching api.
watchAPIMustAddObjectsByRole map[string][][]byte
}
cases := []testCase{
{
name: "simple 1 pod with update 1",
sdc: &SDConfig{
Role: "pod",
},
expectedTargetsLen: 2,
initAPIObjectsByRole: map[string][]byte{
"pod": []byte(`{
"kind": "PodList",
"apiVersion": "v1",
"metadata": {
"resourceVersion": "72425"
},
"items": [
{
"apiVersion": "v1",
"kind": "Pod",
"metadata": {
"labels": {
"app.kubernetes.io/instance": "stack",
"pod-template-hash": "5b9c6cf775"
},
"name": "stack-name-1",
"namespace": "default"
},
"spec": {
"containers": [
{
"name": "generic-pod"
}
]
},
"status": {
"podIP": "10.10.2.2",
"phase": "Running"
}
}]}`),
},
watchAPIMustAddObjectsByRole: map[string][][]byte{
"pod": {
[]byte(`{
"apiVersion": "v1",
"kind": "Pod",
"metadata": {
"labels": {
"app.kubernetes.io/instance": "stack",
"pod-template-hash": "5b9c6cf775"
},
"name": "stack-next-2",
"namespace": "default"
},
"spec": {
"containers": [
{
"name": "generic-pod-2"
}
]
},
"status": {
"podIP": "10.10.2.5",
"phase": "Running"
}
}`),
},
},
},
{
name: "endpoints with service update",
sdc: &SDConfig{
Role: "endpoints",
},
expectedTargetsLen: 2,
initAPIObjectsByRole: map[string][]byte{
"service": []byte(`{
"kind": "ServiceList",
"apiVersion": "v1",
"metadata": {
"resourceVersion": "72425"
},
"items": []}`),
"endpoints": []byte(`{
"kind": "EndpointsList",
"apiVersion": "v1",
"metadata": {
"resourceVersion": "72425"
},
"items": [
{
"apiVersion": "v1",
"kind": "Endpoints",
"metadata": {
"annotations": {
"endpoints.kubernetes.io/last-change-trigger-time": "2021-04-27T02:06:55Z"
},
"labels": {
"app.kubernetes.io/managed-by": "Helm"
},
"name": "stack-kube-state-metrics",
"namespace": "default"
},
"subsets": [
{
"addresses": [
{
"ip": "10.244.0.5",
"nodeName": "kind-control-plane",
"targetRef": {
"kind": "Pod",
"name": "stack-kube-state-metrics-db5879bf8-bg78p",
"namespace": "default"
}
}
],
"ports": [
{
"name": "http",
"port": 8080,
"protocol": "TCP"
}
]
}
]
}
]}`),
"pod": []byte(`{
"kind": "PodList",
"apiVersion": "v1",
"metadata": {
"resourceVersion": "72425"
},
"items": [
{
"apiVersion": "v1",
"kind": "Pod",
"metadata": {
"labels": {
"app.kubernetes.io/instance": "stack"
},
"name": "stack-kube-state-metrics-db5879bf8-bg78p",
"namespace": "default"
},
"spec": {
"containers": [
{
"image": "k8s.gcr.io/kube-state-metrics/kube-state-metrics:v1.9.8",
"name": "kube-state-metrics",
"ports": [
{
"containerPort": 8080,
"protocol": "TCP"
}
]
},
{
"image": "k8s.gcr.io/kube-state-metrics/kube-state-metrics:v1.9.8",
"name": "kube-state-metrics-2",
"ports": [
{
"containerPort": 8085,
"protocol": "TCP"
}
]
}
]
},
"status": {
"phase": "Running",
"podIP": "10.244.0.5"
}
}
]}`),
},
watchAPIMustAddObjectsByRole: map[string][][]byte{
"service": {
[]byte(`{
"apiVersion": "v1",
"kind": "Service",
"metadata": {
"annotations": {
"meta.helm.sh/release-name": "stack"
},
"labels": {
"app.kubernetes.io/managed-by": "Helm",
"app.kubernetes.io/name": "kube-state-metrics"
},
"name": "stack-kube-state-metrics",
"namespace": "default"
},
"spec": {
"clusterIP": "10.97.109.249",
"ports": [
{
"name": "http",
"port": 8080,
"protocol": "TCP",
"targetPort": 8080
}
],
"selector": {
"app.kubernetes.io/instance": "stack",
"app.kubernetes.io/name": "kube-state-metrics"
},
"type": "ClusterIP"
}
}`),
},
},
},
{
name: "get nodes",
sdc: &SDConfig{Role: "node"},
expectedTargetsLen: 2,
initAPIObjectsByRole: map[string][]byte{
"node": []byte(`{
"kind": "NodeList",
"apiVersion": "v1",
"metadata": {
"selfLink": "/api/v1/nodes",
"resourceVersion": "22627"
},
"items": [
{
"apiVersion": "v1",
"kind": "Node",
"metadata": {
"annotations": {
"kubeadm.alpha.kubernetes.io/cri-socket": "/run/containerd/containerd.sock"
},
"labels": {
"beta.kubernetes.io/arch": "amd64",
"beta.kubernetes.io/os": "linux"
},
"name": "kind-control-plane-new"
},
"status": {
"addresses": [
{
"address": "10.10.2.5",
"type": "InternalIP"
},
{
"address": "kind-control-plane",
"type": "Hostname"
}
]
}
}
]}`),
},
watchAPIMustAddObjectsByRole: map[string][][]byte{
"node": {
[]byte(`{
"apiVersion": "v1",
"kind": "Node",
"metadata": {
"annotations": {
"kubeadm.alpha.kubernetes.io/cri-socket": "/run/containerd/containerd.sock"
},
"labels": {
"beta.kubernetes.io/arch": "amd64",
"beta.kubernetes.io/os": "linux"
},
"name": "kind-control-plane"
},
"status": {
"addresses": [
{
"address": "10.10.2.2",
"type": "InternalIP"
},
{
"address": "kind-control-plane",
"type": "Hostname"
}
]
}
}`),
},
},
},
{
name: "2 service with 2 added",
sdc: &SDConfig{Role: "service"},
expectedTargetsLen: 4,
initAPIObjectsByRole: map[string][]byte{
"service": []byte(`{
"kind": "ServiceList",
"apiVersion": "v1",
"metadata": {
"selfLink": "/api/v1/services",
"resourceVersion": "60485"
},
"items": [
{
"metadata": {
"name": "kube-dns",
"namespace": "kube-system",
"labels": {
"k8s-app": "kube-dns"
}
},
"spec": {
"ports": [
{
"name": "dns",
"protocol": "UDP",
"port": 53,
"targetPort": 53
},
{
"name": "dns-tcp",
"protocol": "TCP",
"port": 53,
"targetPort": 53
}
],
"selector": {
"k8s-app": "kube-dns"
},
"clusterIP": "10.96.0.10",
"type": "ClusterIP",
"sessionAffinity": "None"
}
}
]
}`),
},
watchAPIMustAddObjectsByRole: map[string][][]byte{
"service": {
[]byte(`{
"metadata": {
"name": "another-service-1",
"namespace": "default",
"labels": {
"k8s-app": "kube-dns"
}
},
"spec": {
"ports": [
{
"name": "some-app-1-tcp",
"protocol": "TCP",
"port": 1053,
"targetPort": 1053
}
],
"selector": {
"k8s-app": "some-app-1"
},
"clusterIP": "10.96.0.10",
"type": "ClusterIP"
}
}`),
[]byte(`{
"metadata": {
"name": "another-service-2",
"namespace": "default",
"labels": {
"k8s-app": "kube-dns"
}
},
"spec": {
"ports": [
{
"name": "some-app-2-tcp",
"protocol": "TCP",
"port": 1053,
"targetPort": 1053
}
],
"selector": {
"k8s-app": "some-app-2"
},
"clusterIP": "10.96.0.15",
"type": "ClusterIP"
}
}`),
},
},
},
{
name: "1 ingress with 2 add",
expectedTargetsLen: 3,
sdc: &SDConfig{
Role: "ingress",
},
initAPIObjectsByRole: map[string][]byte{
"ingress": []byte(`{
"kind": "IngressList",
"apiVersion": "extensions/v1",
"metadata": {
"selfLink": "/apis/extensions/v1/ingresses",
"resourceVersion": "351452"
},
"items": [
{
"metadata": {
"name": "test-ingress",
"namespace": "default"
},
"spec": {
"backend": {
"serviceName": "testsvc",
"servicePort": 80
},
"rules": [
{
"host": "foobar"
}
]
},
"status": {
"loadBalancer": {
"ingress": [
{
"ip": "172.17.0.2"
}
]
}
}
}
]
}`),
},
watchAPIMustAddObjectsByRole: map[string][][]byte{
"ingress": {
[]byte(`{
"metadata": {
"name": "test-ingress-1",
"namespace": "default"
},
"spec": {
"backend": {
"serviceName": "testsvc",
"servicePort": 801
},
"rules": [
{
"host": "foobar"
}
]
},
"status": {
"loadBalancer": {
"ingress": [
{
"ip": "172.17.0.3"
}
]
}
}
}`),
[]byte(`{
"metadata": {
"name": "test-ingress-2",
"namespace": "default"
},
"spec": {
"backend": {
"serviceName": "testsvc",
"servicePort": 802
},
"rules": [
{
"host": "foobar"
}
]
},
"status": {
"loadBalancer": {
"ingress": [
{
"ip": "172.17.0.3"
}
]
}
}
}`),
},
},
},
{
name: "7 endpointslices slice with 1 service update",
sdc: &SDConfig{
Role: "endpointslice",
},
expectedTargetsLen: 7,
initAPIObjectsByRole: map[string][]byte{
"endpointslice": []byte(`{
"kind": "EndpointSliceList",
"apiVersion": "discovery.k8s.io/v1",
"metadata": {
"selfLink": "/apis/discovery.k8s.io/v1/endpointslices",
"resourceVersion": "1177"
},
"items": [
{
"metadata": {
"name": "kubernetes",
"namespace": "default",
"labels": {
"kubernetes.io/service-name": "kubernetes"
}
},
"addressType": "IPv4",
"endpoints": [
{
"addresses": [
"172.18.0.2"
],
"conditions": {
"ready": true
}
}
],
"ports": [
{
"name": "https",
"protocol": "TCP",
"port": 6443
}
]
},
{
"metadata": {
"name": "kube-dns",
"namespace": "kube-system",
"labels": {
"kubernetes.io/service-name": "kube-dns"
}
},
"addressType": "IPv4",
"endpoints": [
{
"addresses": [
"10.244.0.3"
],
"conditions": {
"ready": true
},
"targetRef": {
"kind": "Pod",
"namespace": "kube-system",
"name": "coredns-66bff467f8-z8czk",
"uid": "36a545ff-dbba-4192-a5f6-1dbb0c21c73d",
"resourceVersion": "603"
},
"topology": {
"kubernetes.io/hostname": "kind-control-plane"
}
},
{
"addresses": [
"10.244.0.4"
],
"conditions": {
"ready": true
},
"targetRef": {
"kind": "Pod",
"namespace": "kube-system",
"name": "coredns-66bff467f8-kpbhk",
"uid": "db38d8b4-847a-4e82-874c-fe444fba2718",
"resourceVersion": "576"
},
"topology": {
"kubernetes.io/hostname": "kind-control-plane"
}
}
],
"ports": [
{
"name": "dns-tcp",
"protocol": "TCP",
"port": 53
},
{
"name": "metrics",
"protocol": "TCP",
"port": 9153
},
{
"name": "dns",
"protocol": "UDP",
"port": 53
}
]
}
]
}`),
"pod": []byte(`{
"kind": "PodList",
"apiVersion": "v1",
"metadata": {
"resourceVersion": "72425"
},
"items": [
{
"apiVersion": "v1",
"kind": "Pod",
"metadata": {
"labels": {
"app.kubernetes.io/instance": "stack",
"pod-template-hash": "5b9c6cf775"
},
"name": "coredns-66bff467f8-kpbhk",
"namespace": "kube-system"
},
"spec": {
"containers": [
{
"name": "generic-pod"
}
]
},
"status": {
"podIP": "10.10.2.2",
"phase": "Running"
}
},
{
"apiVersion": "v1",
"kind": "Pod",
"metadata": {
"labels": {
"app.kubernetes.io/instance": "stack",
"pod-template-hash": "5b9c6cf775"
},
"name": "coredns-66bff467f8-z8czk",
"namespace": "kube-system"
},
"spec": {
"containers": [
{
"name": "generic-pod"
}
]
},
"status": {
"podIP": "10.10.2.3",
"phase": "Running"
}
}
]}`),
"service": []byte(`{
"kind": "ServiceList",
"apiVersion": "v1",
"metadata": {
"selfLink": "/api/v1/services",
"resourceVersion": "60485"
},
"items": [
{
"metadata": {
"name": "kube-dns",
"namespace": "kube-system",
"labels": {
"k8s-app": "kube-dns"
}
},
"spec": {
"ports": [
{
"name": "dns",
"protocol": "UDP",
"port": 53,
"targetPort": 53
},
{
"name": "dns-tcp",
"protocol": "TCP",
"port": 53,
"targetPort": 53
}
],
"selector": {
"k8s-app": "kube-dns"
},
"clusterIP": "10.96.0.10",
"type": "ClusterIP",
"sessionAffinity": "None"
}
}
]
}`),
},
watchAPIMustAddObjectsByRole: map[string][][]byte{
"service": {
[]byte(` {
"metadata": {
"name": "kube-dns",
"namespace": "kube-system",
"labels": {
"k8s-app": "kube-dns",
"some-new": "label-value"
}
},
"spec": {
"ports": [
{
"name": "dns-tcp",
"protocol": "TCP",
"port": 53,
"targetPort": 53
}
],
"selector": {
"k8s-app": "kube-dns"
},
"clusterIP": "10.96.0.10",
"type": "ClusterIP",
"sessionAffinity": "None"
}
}
`),
},
},
},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
watchPublishersByRole := make(map[string]*watchObjectBroadcast)
mux := http.NewServeMux()
for role, obj := range tc.initAPIObjectsByRole {
watchBroadCaster := &watchObjectBroadcast{}
watchPublishersByRole[role] = watchBroadCaster
apiPath := getAPIPath(getObjectTypeByRole(role), "", "")
addAPIURLHandler(t, mux, apiPath, obj, watchBroadCaster)
}
testAPIServer := httptest.NewServer(mux)
tc.sdc.APIServer = testAPIServer.URL
ac, err := newAPIConfig(tc.sdc, "", func(metaLabels *promutils.Labels) interface{} {
var res []interface{}
for _, label := range metaLabels.Labels {
res = append(res, label.Name)
}
return res
})
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
tc.sdc.cfg = ac
ac.aw.mustStart()
defer ac.aw.mustStop()
_, err = tc.sdc.GetScrapeWorkObjects()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
// need to wait, for subscribers to start.
time.Sleep(80 * time.Millisecond)
for role, objs := range tc.watchAPIMustAddObjectsByRole {
for _, obj := range objs {
watchPublishersByRole[role].pub(obj)
}
}
for _, ch := range watchPublishersByRole {
ch.shutdown()
}
if len(tc.watchAPIMustAddObjectsByRole) > 0 {
// updates async, need to wait some time.
// i guess, poll is not reliable.
time.Sleep(80 * time.Millisecond)
}
got, err := tc.sdc.GetScrapeWorkObjects()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
if len(got) != tc.expectedTargetsLen {
t.Fatalf("unexpected count of objects, got: %d, want: %d", len(got), tc.expectedTargetsLen)
}
})
}
}
type watchObjectBroadcast struct {
mu sync.Mutex
subscribers []chan []byte
}
func (o *watchObjectBroadcast) pub(msg []byte) {
o.mu.Lock()
defer o.mu.Unlock()
for i := range o.subscribers {
c := o.subscribers[i]
select {
case c <- msg:
default:
}
}
}
func (o *watchObjectBroadcast) sub() <-chan []byte {
c := make(chan []byte, 5)
o.mu.Lock()
o.subscribers = append(o.subscribers, c)
o.mu.Unlock()
return c
}
func (o *watchObjectBroadcast) shutdown() {
o.mu.Lock()
defer o.mu.Unlock()
for i := range o.subscribers {
c := o.subscribers[i]
close(c)
}
}
func addAPIURLHandler(t *testing.T, mux *http.ServeMux, apiURL string, initObjects []byte, notifier *watchObjectBroadcast) {
t.Helper()
mux.HandleFunc(apiURL, func(w http.ResponseWriter, r *http.Request) {
if needWatch := r.URL.Query().Get("watch"); len(needWatch) > 0 {
// start watch handler
w.WriteHeader(200)
flusher := w.(http.Flusher)
flusher.Flush()
updateC := notifier.sub()
for obj := range updateC {
we := WatchEvent{
Type: "ADDED",
Object: obj,
}
szd, err := json.Marshal(we)
if err != nil {
t.Fatalf("cannot serialize: %v", err)
}
_, _ = w.Write(szd)
flusher.Flush()
}
return
}
w.WriteHeader(200)
_, _ = w.Write(initObjects)
})
}
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