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reflector.go
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reflector.go
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// Copyright 2020 The PipeCD Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kubernetes
import (
"context"
"fmt"
"time"
"go.uber.org/zap"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/discovery"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/dynamic/dynamicinformer"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
provider "github.com/pipe-cd/pipecd/pkg/app/piped/cloudprovider/kubernetes"
"github.com/pipe-cd/pipecd/pkg/app/piped/livestatestore/kubernetes/kubernetesmetrics"
"github.com/pipe-cd/pipecd/pkg/config"
)
var (
// This is the default whitelist of resources that should be watched.
// User can add/remove other resources to be watched in piped config at cloud provider part.
groupWhitelist = map[string]struct{}{
"": {},
"apps": {},
"extensions": {},
"batch": {},
"storage.k8s.io": {},
"autoscaling": {},
"networking.k8s.io": {},
"apiextensions.k8s.io": {},
"rbac.authorization.k8s.io": {},
"policy": {},
"apiregistration.k8s.io": {},
"authorization.k8s.io": {},
}
versionWhitelist = map[string]struct{}{
"v1": {},
"v1beta1": {},
"v1beta2": {},
}
kindWhitelist = map[string]struct{}{
"Service": {},
"Endpoints": {},
"Deployment": {},
"DaemonSet": {},
"StatefulSet": {},
"ReplicationController": {},
"ReplicaSet": {},
"Pod": {},
"Job": {},
"CronJob": {},
"ConfigMap": {},
"Secret": {},
"Ingress": {},
"NetworkPolicy": {},
"StorageClass": {},
"PersistentVolume": {},
"PersistentVolumeClaim": {},
"HorizontalPodAutoscaler": {},
"ServiceAccount": {},
"Role": {},
"RoleBinding": {},
"ClusterRole": {},
"ClusterRoleBinding": {},
"CustomResourceDefinition": {},
"PodDisruptionBudget": {},
"PodSecurityPolicy": {},
"APIService": {},
"LocalSubjectAccessReview": {},
"SelfSubjectAccessReview": {},
"SelfSubjectRulesReview": {},
"SubjectAccessReview": {},
"ResourceQuota": {},
"PodTemplate": {},
"IngressClass": {},
"Namespace": {},
}
ignoreResourceKeys = map[string]struct{}{
"v1:Service:default:kubernetes": {},
"v1:Service:kube-system:heapster": {},
"v1:Service:kube-system:metrics-server": {},
"v1:Service:kube-system:kube-dns": {},
"v1:Service:kube-system:kubernetes-dashboard": {},
"v1:Service:kube-system:default-http-backend": {},
"apps/v1:Deployment:kube-system:kube-dns": {},
"apps/v1:Deployment:kube-system:kube-dns-autoscaler": {},
"apps/v1:Deployment:kube-system:fluentd-gcp-scaler": {},
"apps/v1:Deployment:kube-system:kubernetes-dashboard": {},
"apps/v1:Deployment:kube-system:l7-default-backend": {},
"apps/v1:Deployment:kube-system:heapster-gke": {},
"apps/v1:Deployment:kube-system:stackdriver-metadata-agent-cluster-level": {},
"extensions/v1beta1:Deployment:kube-system:kube-dns": {},
"extensions/v1beta1:Deployment:kube-system:kube-dns-autoscaler": {},
"extensions/v1beta1:Deployment:kube-system:fluentd-gcp-scaler": {},
"extensions/v1beta1:Deployment:kube-system:kubernetes-dashboard": {},
"extensions/v1beta1:Deployment:kube-system:l7-default-backend": {},
"extensions/v1beta1:Deployment:kube-system:heapster-gke": {},
"extensions/v1beta1:Deployment:kube-system:stackdriver-metadata-agent-cluster-level": {},
"v1:Endpoints:kube-system:kube-controller-manager": {},
"v1:Endpoints:kube-system:kube-scheduler": {},
"v1:Endpoints:kube-system:vpa-recommender": {},
"v1:Endpoints:kube-system:gcp-controller-manager": {},
"v1:Endpoints:kube-system:managed-certificate-controller": {},
"v1:Endpoints:kube-system:cluster-autoscaler": {},
"v1:ConfigMap:kube-system:cluster-kubestore": {},
"v1:ConfigMap:kube-system:ingress-gce-lock": {},
"v1:ConfigMap:kube-system:gke-common-webhook-lock": {},
"v1:ConfigMap:kube-system:cluster-autoscaler-status": {},
"rbac.authorization.k8s.io/v1:ClusterRole::system:managed-certificate-controller": {},
"rbac.authorization.k8s.io/v1:ClusterRoleBinding::system:managed-certificate-controller": {},
}
)
// reflector watches the live state of application with the cluster
// and triggers the specified callbacks.
type reflector struct {
config *config.CloudProviderKubernetesConfig
kubeConfig *restclient.Config
pipedConfig *config.PipedSpec
onAdd func(obj *unstructured.Unstructured)
onUpdate func(oldObj, obj *unstructured.Unstructured)
onDelete func(obj *unstructured.Unstructured)
watchingResourceKinds []provider.APIVersionKind
stopCh chan struct{}
logger *zap.Logger
}
func (r *reflector) start(ctx context.Context) error {
matcher := newResourceMatcher(r.config.AppStateInformer)
// Use discovery to discover APIs supported by the Kubernetes API server.
// This should be run periodically with a low rate because the APIs are not added frequently.
// https://godoc.org/k8s.io/client-go/discovery
discoveryClient, err := discovery.NewDiscoveryClientForConfig(r.kubeConfig)
if err != nil {
return fmt.Errorf("failed to create discovery client: %v", err)
}
groupResources, err := discoveryClient.ServerPreferredResources()
if err != nil {
return fmt.Errorf("failed to fetch preferred resources: %v", err)
}
r.logger.Info(fmt.Sprintf("successfully preferred resources that contains for %d groups", len(groupResources)))
// Filter above APIResources.
var (
targetResources = make([]schema.GroupVersionResource, 0)
namespacedTargetResources = make([]schema.GroupVersionResource, 0)
)
for _, gr := range groupResources {
for _, resource := range gr.APIResources {
gvk := schema.FromAPIVersionAndKind(gr.GroupVersion, resource.Kind)
if !matcher.Match(gvk) {
r.logger.Info(fmt.Sprintf("skip watching %v because of not matching the configured list", gvk))
continue
}
if !isSupportedList(resource) || !isSupportedWatch(resource) {
r.logger.Info(fmt.Sprintf("skip watching %v because of not supporting watch or list verb", gvk))
continue
}
gv := gvk.GroupVersion()
r.watchingResourceKinds = append(r.watchingResourceKinds, provider.APIVersionKind{
APIVersion: gv.String(),
Kind: gvk.Kind,
})
target := gv.WithResource(resource.Name)
if resource.Namespaced {
namespacedTargetResources = append(namespacedTargetResources, target)
} else {
targetResources = append(targetResources, target)
}
}
}
r.logger.Info("filtered target resources",
zap.Any("targetResources", targetResources),
zap.Any("namespacedTargetResources", namespacedTargetResources),
)
// Use dynamic to perform generic operations on arbitrary Kubernets API objects.
// https://godoc.org/k8s.io/client-go/dynamic
dynamicClient, err := dynamic.NewForConfig(r.kubeConfig)
if err != nil {
return fmt.Errorf("failed to create dynamic client: %v", err)
}
stopCh := make(chan struct{})
startInformer := func(namespace string, resources []schema.GroupVersionResource) {
factory := dynamicinformer.NewFilteredDynamicSharedInformerFactory(dynamicClient, 30*time.Minute, namespace, nil)
for _, tr := range resources {
di := factory.ForResource(tr).Informer()
di.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: r.onObjectAdd,
UpdateFunc: r.onObjectUpdate,
DeleteFunc: r.onObjectDelete,
})
go di.Run(r.stopCh)
if cache.WaitForCacheSync(stopCh, di.HasSynced) {
r.logger.Info(fmt.Sprintf("informer cache for %v has been synced", tr))
} else {
// TODO: Handle the case informer cache has not been synced correctly.
r.logger.Info(fmt.Sprintf("informer cache for %v has not been synced correctly", tr))
}
}
}
ns := r.config.AppStateInformer.Namespace
if ns == "" {
ns = metav1.NamespaceAll
}
r.logger.Info(fmt.Sprintf("start running %d namespaced-resource informers", len(namespacedTargetResources)))
startInformer(ns, namespacedTargetResources)
if ns == metav1.NamespaceAll {
r.logger.Info(fmt.Sprintf("start running %d non-namespaced-resource informers", len(targetResources)))
startInformer(metav1.NamespaceAll, targetResources)
}
r.logger.Info("all informer caches have been synced")
return nil
}
func (r *reflector) onObjectAdd(obj interface{}) {
u := obj.(*unstructured.Unstructured)
key := provider.MakeResourceKey(u)
// Ignore all predefined ones.
if _, ok := ignoreResourceKeys[key.String()]; ok {
kubernetesmetrics.IncResourceEventsCounter(
kubernetesmetrics.LabelEventAdd,
kubernetesmetrics.LabelEventNotYetHandled,
)
return
}
// Ignore all objects that are not handled by this piped.
pipedID := u.GetAnnotations()[provider.LabelPiped]
if pipedID != "" && pipedID != r.pipedConfig.PipedID {
kubernetesmetrics.IncResourceEventsCounter(
kubernetesmetrics.LabelEventAdd,
kubernetesmetrics.LabelEventNotYetHandled,
)
return
}
r.logger.Debug(fmt.Sprintf("received add event for %s", key.String()))
r.onAdd(u)
kubernetesmetrics.IncResourceEventsCounter(
kubernetesmetrics.LabelEventAdd,
kubernetesmetrics.LabelEventHandled,
)
}
func (r *reflector) onObjectUpdate(oldObj, obj interface{}) {
u := obj.(*unstructured.Unstructured)
oldU := oldObj.(*unstructured.Unstructured)
// Ignore all predefined ones.
key := provider.MakeResourceKey(u)
if _, ok := ignoreResourceKeys[key.String()]; ok {
kubernetesmetrics.IncResourceEventsCounter(
kubernetesmetrics.LabelEventUpdate,
kubernetesmetrics.LabelEventNotYetHandled,
)
return
}
// Ignore all objects that are not handled by this piped.
pipedID := u.GetAnnotations()[provider.LabelPiped]
if pipedID != "" && pipedID != r.pipedConfig.PipedID {
kubernetesmetrics.IncResourceEventsCounter(
kubernetesmetrics.LabelEventUpdate,
kubernetesmetrics.LabelEventNotYetHandled,
)
return
}
r.logger.Debug(fmt.Sprintf("received update event for %s", key.String()))
r.onUpdate(oldU, u)
kubernetesmetrics.IncResourceEventsCounter(
kubernetesmetrics.LabelEventUpdate,
kubernetesmetrics.LabelEventHandled,
)
}
func (r *reflector) onObjectDelete(obj interface{}) {
u := obj.(*unstructured.Unstructured)
key := provider.MakeResourceKey(u)
// Ignore all predefined ones.
if _, ok := ignoreResourceKeys[key.String()]; ok {
kubernetesmetrics.IncResourceEventsCounter(
kubernetesmetrics.LabelEventDelete,
kubernetesmetrics.LabelEventNotYetHandled,
)
return
}
// Ignore all objects that are not handled by this piped.
pipedID := u.GetAnnotations()[provider.LabelPiped]
if pipedID != "" && pipedID != r.pipedConfig.PipedID {
kubernetesmetrics.IncResourceEventsCounter(
kubernetesmetrics.LabelEventDelete,
kubernetesmetrics.LabelEventNotYetHandled,
)
return
}
r.logger.Debug(fmt.Sprintf("received delete event for %s", key.String()))
r.onDelete(u)
kubernetesmetrics.IncResourceEventsCounter(
kubernetesmetrics.LabelEventDelete,
kubernetesmetrics.LabelEventHandled,
)
}
func isSupportedWatch(r metav1.APIResource) bool {
for _, v := range r.Verbs {
if v == "watch" {
return true
}
}
return false
}
func isSupportedList(r metav1.APIResource) bool {
for _, v := range r.Verbs {
if v == "list" {
return true
}
}
return false
}
type resourceMatcher struct {
includes map[string]struct{}
excludes map[string]struct{}
}
func newResourceMatcher(cfg config.KubernetesAppStateInformer) *resourceMatcher {
r := &resourceMatcher{
includes: make(map[string]struct{}, len(cfg.IncludeResources)),
excludes: make(map[string]struct{}, len(cfg.ExcludeResources)),
}
for _, m := range cfg.IncludeResources {
if m.Kind == "" {
r.includes[m.APIVersion] = struct{}{}
} else {
r.includes[m.APIVersion+":"+m.Kind] = struct{}{}
}
}
for _, m := range cfg.ExcludeResources {
if m.Kind == "" {
r.excludes[m.APIVersion] = struct{}{}
} else {
r.excludes[m.APIVersion+":"+m.Kind] = struct{}{}
}
}
return r
}
func (m *resourceMatcher) Match(gvk schema.GroupVersionKind) bool {
var (
gv = gvk.GroupVersion()
apiVersion = gv.String()
key = apiVersion + ":" + gvk.Kind
)
// Any resource matches the specified ExcludeResources will be ignored.
if _, ok := m.excludes[apiVersion]; ok {
return false
}
if _, ok := m.excludes[key]; ok {
return false
}
// Any resources matches the specified IncludeResources will be included.
if _, ok := m.includes[apiVersion]; ok {
return true
}
if _, ok := m.includes[key]; ok {
return true
}
// Check the predefined list.
if _, ok := kindWhitelist[gvk.Kind]; !ok {
return false
}
if _, ok := groupWhitelist[gv.Group]; !ok {
return false
}
if _, ok := versionWhitelist[gv.Version]; !ok {
return false
}
return true
}