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k8sutil.go
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k8sutil.go
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// Copyright 2016 The prometheus-operator 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 (
"fmt"
"net/http"
"net/url"
"regexp"
"strings"
"time"
crdutils "github.com/ant31/crd-validation/pkg"
monitoringv1 "github.com/coreos/prometheus-operator/pkg/apis/monitoring/v1"
version "github.com/hashicorp/go-version"
"github.com/pkg/errors"
"k8s.io/api/core/v1"
extensionsobj "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/validation"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/discovery"
clientv1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/rest"
)
var invalidDNS1123Characters = regexp.MustCompile("[^-a-z0-9]+")
// CustomResourceDefinitionTypeMeta set the default kind/apiversion of CRD
var CustomResourceDefinitionTypeMeta metav1.TypeMeta = metav1.TypeMeta{
Kind: "CustomResourceDefinition",
APIVersion: "apiextensions.k8s.io/v1beta1",
}
// WaitForCRDReady waits for a custom resource definition to be available for use.
func WaitForCRDReady(listFunc func(opts metav1.ListOptions) (runtime.Object, error)) error {
err := wait.Poll(3*time.Second, 10*time.Minute, func() (bool, error) {
_, err := listFunc(metav1.ListOptions{})
if err != nil {
if se, ok := err.(*apierrors.StatusError); ok {
if se.Status().Code == http.StatusNotFound {
return false, nil
}
}
return false, errors.Wrap(err, "failed to list CRD")
}
return true, nil
})
return errors.Wrap(err, fmt.Sprintf("timed out waiting for Custom Resource"))
}
// PodRunningAndReady returns whether a pod is running and each container has
// passed it's ready state.
func PodRunningAndReady(pod v1.Pod) (bool, error) {
switch pod.Status.Phase {
case v1.PodFailed, v1.PodSucceeded:
return false, fmt.Errorf("pod completed")
case v1.PodRunning:
for _, cond := range pod.Status.Conditions {
if cond.Type != v1.PodReady {
continue
}
return cond.Status == v1.ConditionTrue, nil
}
return false, fmt.Errorf("pod ready condition not found")
}
return false, nil
}
func NewClusterConfig(host string, tlsInsecure bool, tlsConfig *rest.TLSClientConfig) (*rest.Config, error) {
var cfg *rest.Config
var err error
if len(host) == 0 {
if cfg, err = rest.InClusterConfig(); err != nil {
return nil, err
}
} else {
cfg = &rest.Config{
Host: host,
}
hostURL, err := url.Parse(host)
if err != nil {
return nil, fmt.Errorf("error parsing host url %s : %v", host, err)
}
if hostURL.Scheme == "https" {
cfg.TLSClientConfig = *tlsConfig
cfg.Insecure = tlsInsecure
}
}
cfg.QPS = 100
cfg.Burst = 100
return cfg, nil
}
func IsResourceNotFoundError(err error) bool {
se, ok := err.(*apierrors.StatusError)
if !ok {
return false
}
if se.Status().Code == http.StatusNotFound && se.Status().Reason == metav1.StatusReasonNotFound {
return true
}
return false
}
func CreateOrUpdateService(sclient clientv1.ServiceInterface, svc *v1.Service) error {
service, err := sclient.Get(svc.Name, metav1.GetOptions{})
if err != nil && !apierrors.IsNotFound(err) {
return errors.Wrap(err, "retrieving service object failed")
}
if apierrors.IsNotFound(err) {
_, err = sclient.Create(svc)
if err != nil {
return errors.Wrap(err, "creating service object failed")
}
} else {
svc.ResourceVersion = service.ResourceVersion
svc.SetOwnerReferences(mergeOwnerReferences(service.GetOwnerReferences(), svc.GetOwnerReferences()))
_, err := sclient.Update(svc)
if err != nil && !apierrors.IsNotFound(err) {
return errors.Wrap(err, "updating service object failed")
}
}
return nil
}
func CreateOrUpdateEndpoints(eclient clientv1.EndpointsInterface, eps *v1.Endpoints) error {
endpoints, err := eclient.Get(eps.Name, metav1.GetOptions{})
if err != nil && !apierrors.IsNotFound(err) {
return errors.Wrap(err, "retrieving existing kubelet endpoints object failed")
}
if apierrors.IsNotFound(err) {
_, err = eclient.Create(eps)
if err != nil {
return errors.Wrap(err, "creating kubelet endpoints object failed")
}
} else {
eps.ResourceVersion = endpoints.ResourceVersion
_, err = eclient.Update(eps)
if err != nil {
return errors.Wrap(err, "updating kubelet endpoints object failed")
}
}
return nil
}
// GetMinorVersion returns the minor version as an integer
func GetMinorVersion(dclient discovery.DiscoveryInterface) (int, error) {
v, err := dclient.ServerVersion()
if err != nil {
return 0, err
}
ver, err := version.NewVersion(v.String())
if err != nil {
return 0, err
}
return ver.Segments()[1], nil
}
func NewCustomResourceDefinition(crdKind monitoringv1.CrdKind, group string, labels map[string]string, validation bool) *extensionsobj.CustomResourceDefinition {
return crdutils.NewCustomResourceDefinition(crdutils.Config{
SpecDefinitionName: crdKind.SpecName,
EnableValidation: validation,
Labels: crdutils.Labels{LabelsMap: labels},
ResourceScope: string(extensionsobj.NamespaceScoped),
Group: group,
Kind: crdKind.Kind,
Version: monitoringv1.Version,
Plural: crdKind.Plural,
GetOpenAPIDefinitions: monitoringv1.GetOpenAPIDefinitions,
})
}
// SanitizeVolumeName ensures that the given volume name is a valid DNS-1123 label
// accepted by Kubernetes.
func SanitizeVolumeName(name string) string {
name = strings.ToLower(name)
name = invalidDNS1123Characters.ReplaceAllString(name, "-")
if len(name) > validation.DNS1123LabelMaxLength {
name = name[0:validation.DNS1123LabelMaxLength]
}
return strings.Trim(name, "-")
}
func mergeOwnerReferences(old []metav1.OwnerReference, new []metav1.OwnerReference) []metav1.OwnerReference {
existing := make(map[metav1.OwnerReference]bool)
for _, ownerRef := range old {
existing[ownerRef] = true
}
for _, ownerRef := range new {
if _, ok := existing[ownerRef]; !ok {
old = append(old, ownerRef)
}
}
return old
}