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If we are dry-running, do not attempt to fetch the /version resource and just return the stored FakeServerVersion, which is done when constructing the dry-run client in upgrade/common.go#getClient(). The problem here is that during upgrade dry-run client reactors are backed by a dynamic client via NewClientBackedDryRunGetterFromKubeconfig() and for GetActions there seems to be no analog to Discovery().Serverversion() resource for a dynamic client(?).
163 lines
6.0 KiB
Go
163 lines
6.0 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package upgrade
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import (
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"context"
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"github.com/pkg/errors"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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versionutil "k8s.io/apimachinery/pkg/util/version"
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pkgversion "k8s.io/apimachinery/pkg/version"
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fakediscovery "k8s.io/client-go/discovery/fake"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/component-base/version"
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kubeadmutil "k8s.io/kubernetes/cmd/kubeadm/app/util"
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)
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// VersionGetter defines an interface for fetching different versions.
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// Easy to implement a fake variant of this interface for unit testing
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type VersionGetter interface {
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// ClusterVersion should return the version of the cluster i.e. the API Server version
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ClusterVersion() (string, *versionutil.Version, error)
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// KubeadmVersion should return the version of the kubeadm CLI
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KubeadmVersion() (string, *versionutil.Version, error)
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// VersionFromCILabel should resolve CI labels like `latest`, `stable`, `stable-1.8`, etc. to real versions
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VersionFromCILabel(string, string) (string, *versionutil.Version, error)
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// KubeletVersions should return a map with a version and a number that describes how many kubelets there are for that version
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KubeletVersions() (map[string]uint16, error)
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}
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// KubeVersionGetter handles the version-fetching mechanism from external sources
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type KubeVersionGetter struct {
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client clientset.Interface
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}
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// NewKubeVersionGetter returns a new instance of KubeVersionGetter
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func NewKubeVersionGetter(client clientset.Interface) VersionGetter {
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return &KubeVersionGetter{
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client: client,
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}
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}
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// ClusterVersion gets API server version
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func (g *KubeVersionGetter) ClusterVersion() (string, *versionutil.Version, error) {
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var (
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clusterVersionInfo *pkgversion.Info
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err error
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)
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// If we are dry-running, do not attempt to fetch the /version resource and just return
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// the stored FakeServerVersion, which is done when constructing the dry-run client in
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// common.go#getClient()
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// The problem here is that during upgrade dry-run client reactors are backed by a dynamic client
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// via NewClientBackedDryRunGetterFromKubeconfig() and for GetActions there seems to be no analog to
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// Discovery().Serverversion() resource for a dynamic client(?).
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fakeclientDiscovery, ok := g.client.Discovery().(*fakediscovery.FakeDiscovery)
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if ok {
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clusterVersionInfo = fakeclientDiscovery.FakedServerVersion
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} else {
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clusterVersionInfo, err = g.client.Discovery().ServerVersion()
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if err != nil {
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return "", nil, errors.Wrap(err, "Couldn't fetch cluster version from the API Server")
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}
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}
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clusterVersion, err := versionutil.ParseSemantic(clusterVersionInfo.String())
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if err != nil {
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return "", nil, errors.Wrap(err, "Couldn't parse cluster version")
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}
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return clusterVersionInfo.String(), clusterVersion, nil
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}
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// KubeadmVersion gets kubeadm version
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func (g *KubeVersionGetter) KubeadmVersion() (string, *versionutil.Version, error) {
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kubeadmVersionInfo := version.Get()
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kubeadmVersion, err := versionutil.ParseSemantic(kubeadmVersionInfo.String())
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if err != nil {
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return "", nil, errors.Wrap(err, "Couldn't parse kubeadm version")
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}
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return kubeadmVersionInfo.String(), kubeadmVersion, nil
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}
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// VersionFromCILabel resolves a version label like "latest" or "stable" to an actual version using the public Kubernetes CI uploads
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func (g *KubeVersionGetter) VersionFromCILabel(ciVersionLabel, description string) (string, *versionutil.Version, error) {
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versionStr, err := kubeadmutil.KubernetesReleaseVersion(ciVersionLabel)
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if err != nil {
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return "", nil, errors.Wrapf(err, "Couldn't fetch latest %s from the internet", description)
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}
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ver, err := versionutil.ParseSemantic(versionStr)
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if err != nil {
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return "", nil, errors.Wrapf(err, "Couldn't parse latest %s", description)
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}
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return versionStr, ver, nil
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}
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// KubeletVersions gets the versions of the kubelets in the cluster
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func (g *KubeVersionGetter) KubeletVersions() (map[string]uint16, error) {
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nodes, err := g.client.CoreV1().Nodes().List(context.TODO(), metav1.ListOptions{})
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if err != nil {
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return nil, errors.New("couldn't list all nodes in cluster")
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}
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return computeKubeletVersions(nodes.Items), nil
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}
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// computeKubeletVersions returns a string-int map that describes how many nodes are of a specific version
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func computeKubeletVersions(nodes []v1.Node) map[string]uint16 {
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kubeletVersions := make(map[string]uint16)
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for _, node := range nodes {
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kver := node.Status.NodeInfo.KubeletVersion
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if _, found := kubeletVersions[kver]; !found {
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kubeletVersions[kver] = 1
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continue
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}
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kubeletVersions[kver]++
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}
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return kubeletVersions
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}
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// OfflineVersionGetter will use the version provided or
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type OfflineVersionGetter struct {
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VersionGetter
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version string
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}
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// NewOfflineVersionGetter wraps a VersionGetter and skips online communication if default information is supplied.
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// Version can be "" and the behavior will be identical to the versionGetter passed in.
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func NewOfflineVersionGetter(versionGetter VersionGetter, version string) VersionGetter {
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return &OfflineVersionGetter{
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VersionGetter: versionGetter,
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version: version,
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}
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}
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// VersionFromCILabel will return the version that was passed into the struct
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func (o *OfflineVersionGetter) VersionFromCILabel(ciVersionLabel, description string) (string, *versionutil.Version, error) {
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if o.version == "" {
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return o.VersionGetter.VersionFromCILabel(ciVersionLabel, description)
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}
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ver, err := versionutil.ParseSemantic(o.version)
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if err != nil {
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return "", nil, errors.Wrapf(err, "Couldn't parse version %s", description)
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}
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return o.version, ver, nil
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}
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