/
k8sutil.go
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/
k8sutil.go
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// Copyright 2018 The Operator-SDK 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 k8sutil
import (
"context"
"fmt"
"io/ioutil"
"os"
"strings"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
discovery "k8s.io/client-go/discovery"
crclient "sigs.k8s.io/controller-runtime/pkg/client"
logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
)
var log = logf.Log.WithName("k8sutil")
// GetWatchNamespace returns the namespace the operator should be watching for changes
func GetWatchNamespace() (string, error) {
ns, found := os.LookupEnv(WatchNamespaceEnvVar)
if !found {
return "", fmt.Errorf("%s must be set", WatchNamespaceEnvVar)
}
return ns, nil
}
// errNoNS indicates that a namespace could not be found for the current
// environment
var ErrNoNamespace = fmt.Errorf("namespace not found for current environment")
// GetOperatorNamespace returns the namespace the operator should be running in.
func GetOperatorNamespace() (string, error) {
nsBytes, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace")
if err != nil {
if os.IsNotExist(err) {
return "", ErrNoNamespace
}
return "", err
}
ns := strings.TrimSpace(string(nsBytes))
log.V(1).Info("Found namespace", "Namespace", ns)
return ns, nil
}
// GetOperatorName return the operator name
func GetOperatorName() (string, error) {
operatorName, found := os.LookupEnv(OperatorNameEnvVar)
if !found {
return "", fmt.Errorf("%s must be set", OperatorNameEnvVar)
}
if len(operatorName) == 0 {
return "", fmt.Errorf("%s must not be empty", OperatorNameEnvVar)
}
return operatorName, nil
}
// ResourceExists returns true if the given resource kind exists
// in the given api groupversion
func ResourceExists(dc discovery.DiscoveryInterface, apiGroupVersion, kind string) (bool, error) {
apiLists, err := dc.ServerResources()
if err != nil {
return false, err
}
for _, apiList := range apiLists {
if apiList.GroupVersion == apiGroupVersion {
for _, r := range apiList.APIResources {
if r.Kind == kind {
return true, nil
}
}
}
}
return false, nil
}
// GetPod returns a Pod object that corresponds to the pod in which the code
// is currently running.
// It expects the environment variable POD_NAME to be set by the downwards API.
func GetPod(ctx context.Context, client crclient.Client, ns string) (*corev1.Pod, error) {
podName := os.Getenv(PodNameEnvVar)
if podName == "" {
return nil, fmt.Errorf("required env %s not set, please configure downward API", PodNameEnvVar)
}
log.V(1).Info("Found podname", "Pod.Name", podName)
pod := &corev1.Pod{}
key := crclient.ObjectKey{Namespace: ns, Name: podName}
err := client.Get(ctx, key, pod)
if err != nil {
log.Error(err, "Failed to get Pod", "Pod.Namespace", ns, "Pod.Name", podName)
return nil, err
}
// .Get() clears the APIVersion and Kind,
// so we need to set them before returning the object.
pod.TypeMeta.APIVersion = "v1"
pod.TypeMeta.Kind = "Pod"
log.V(1).Info("Found Pod", "Pod.Namespace", ns, "Pod.Name", pod.Name)
return pod, nil
}
// GetGVKsFromAddToScheme takes in the runtime scheme and filters out all generic apimachinery meta types.
// It returns just the GVK specific to this scheme.
func GetGVKsFromAddToScheme(addToSchemeFunc func(*runtime.Scheme) error) ([]schema.GroupVersionKind, error) {
s := runtime.NewScheme()
err := addToSchemeFunc(s)
if err != nil {
return nil, err
}
schemeAllKnownTypes := s.AllKnownTypes()
ownGVKs := []schema.GroupVersionKind{}
for gvk, _ := range schemeAllKnownTypes {
if !isKubeMetaKind(gvk.Kind) {
ownGVKs = append(ownGVKs, gvk)
}
}
return ownGVKs, nil
}
func isKubeMetaKind(kind string) bool {
if strings.HasSuffix(kind, "List") ||
kind == "GetOptions" ||
kind == "DeleteOptions" ||
kind == "ExportOptions" ||
kind == "APIVersions" ||
kind == "APIGroupList" ||
kind == "APIResourceList" ||
kind == "UpdateOptions" ||
kind == "CreateOptions" ||
kind == "Status" ||
kind == "WatchEvent" ||
kind == "ListOptions" ||
kind == "APIGroup" {
return true
}
return false
}