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ocp-metadata.go
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ocp-metadata.go
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// Copyright 2023 The go-commons 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 ocpmetadata
import (
"context"
"encoding/json"
"fmt"
"regexp"
"gopkg.in/yaml.v3"
authenticationv1 "k8s.io/api/authentication/v1"
"k8s.io/apimachinery/pkg/api/errors"
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/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/utils/pointer"
)
// Metadata object
type Metadata struct {
clientSet *kubernetes.Clientset
restConfig *rest.Config
dynamicClient dynamic.Interface
}
// NewMetadata instantiates a new OCP metadata discovery agent
func NewMetadata(restConfig *rest.Config) (Metadata, error) {
cs, err := kubernetes.NewForConfig(restConfig)
if err != nil {
return Metadata{}, err
}
dc, err := dynamic.NewForConfig(restConfig)
return Metadata{
clientSet: cs,
dynamicClient: dc,
restConfig: restConfig,
}, err
}
// GetClusterMetadata returns a clusterMetadata object from the given OCP cluster
func (meta *Metadata) GetClusterMetadata() (ClusterMetadata, error) {
metadata := ClusterMetadata{}
infra, err := meta.getInfraDetails()
if err != nil {
return metadata, nil
}
version, err := meta.getVersionInfo()
if err != nil {
return metadata, err
}
metadata.OCPVersion, metadata.OCPMajorVersion, metadata.K8SVersion = version.ocpVersion, version.ocpMajorVersion, version.k8sVersion
if meta.getNodesInfo(&metadata) != nil {
return metadata, err
}
if infra != nil {
metadata.ClusterName, metadata.Platform, metadata.Region = infra.Status.InfrastructureName, infra.Status.Platform, infra.Status.PlatformStatus.Aws.Region
metadata.ClusterType = "self-managed"
for _, v := range infra.Status.PlatformStatus.Aws.ResourceTags {
if v.Key == "red-hat-clustertype" {
metadata.ClusterType = v.Value
}
}
metadata.SDNType, err = meta.getSDNInfo()
if err != nil {
return metadata, err
}
// Get InstallConfig to use in multiple methods
installConfig, err := meta.getClusterConfig()
if err != nil {
return metadata, err
}
metadata.Fips, err = meta.getFips(installConfig)
if err != nil {
return metadata, err
}
metadata.Publish, err = meta.getPublish(installConfig)
if err != nil {
return metadata, err
}
metadata.WorkerArch, err = meta.getComputeWorkerArch(installConfig)
if err != nil {
return metadata, err
}
metadata.ControlPlaneArch, err = meta.getControlPlaneArch(installConfig)
if err != nil {
return metadata, err
}
metadata.Ipsec, metadata.IpsecMode, err = meta.getIPSec()
if err != nil {
return metadata, err
}
}
return metadata, err
}
// GetPrometheus Returns Prometheus URL and a valid Bearer token
func (meta *Metadata) GetPrometheus() (string, string, error) {
prometheusURL, err := getPrometheusURL(meta.dynamicClient)
if err != nil {
return prometheusURL, "", err
}
prometheusToken, err := getBearerToken(meta.clientSet)
return prometheusURL, prometheusToken, err
}
// GetCurrentPodCount returns the number of current running pods across all worker nodes
func (meta *Metadata) GetCurrentPodCount() (int, error) {
var podCount int
nodeList, err := meta.clientSet.CoreV1().Nodes().List(context.TODO(), metav1.ListOptions{LabelSelector: workerNodeSelector})
if err != nil {
return podCount, err
}
podList, err := meta.clientSet.CoreV1().Pods(metav1.NamespaceAll).List(context.TODO(), metav1.ListOptions{FieldSelector: "status.phase=Running"})
if err != nil {
return podCount, err
}
for _, pod := range podList.Items {
for _, node := range nodeList.Items {
if pod.Spec.NodeName == node.Name {
podCount++
break
}
}
}
return podCount, nil
}
// GetDefaultIngressDomain returns default ingress domain of the default ingress controller
func (meta *Metadata) GetDefaultIngressDomain() (string, error) {
ingressController, err := meta.dynamicClient.Resource(schema.GroupVersionResource{
Group: "operator.openshift.io",
Version: "v1",
Resource: "ingresscontrollers",
}).Namespace("openshift-ingress-operator").Get(context.TODO(), "default", metav1.GetOptions{})
if err != nil {
return "", err
}
ingressDomain, found, err := unstructured.NestedString(ingressController.UnstructuredContent(), "status", "domain")
if !found {
return "", fmt.Errorf("domain field not found in operator.openshift.io/v1/namespaces/openshift-ingress-operator/ingresscontrollers/default status")
}
return ingressDomain, err
}
// getPrometheusURL Returns a valid prometheus endpoint from the openshift-monitoring/prometheus-k8s route
func getPrometheusURL(dynamicClient dynamic.Interface) (string, error) {
route, err := dynamicClient.Resource(schema.GroupVersionResource{
Group: routeGroup,
Version: routeVersion,
Resource: routeResource,
}).Namespace(monitoringNs).Get(context.TODO(), "prometheus-k8s", metav1.GetOptions{})
if err != nil {
return "", err
}
prometheusHost, found, err := unstructured.NestedString(route.UnstructuredContent(), "spec", "host")
if !found {
return "", fmt.Errorf("host field not found in %s/prometheus-k8s route spec", monitoringNs)
}
if err != nil {
return "", err
}
return "https://" + prometheusHost, nil
}
// getBearerToken returns a valid bearer token from the openshift-monitoring/prometheus-k8s service account
func getBearerToken(clientset *kubernetes.Clientset) (string, error) {
request := authenticationv1.TokenRequest{
Spec: authenticationv1.TokenRequestSpec{
ExpirationSeconds: pointer.Int64(int64(tokenExpiration.Seconds())),
},
}
response, err := clientset.CoreV1().ServiceAccounts(monitoringNs).CreateToken(context.TODO(), "prometheus-k8s", &request, metav1.CreateOptions{})
return response.Status.Token, err
}
// getInfraDetails returns a pointer to an infrastructure object or nil
func (meta *Metadata) getInfraDetails() (*infraObj, error) {
var infraJSON infraObj
infra, err := meta.dynamicClient.Resource(schema.GroupVersionResource{
Group: "config.openshift.io",
Version: "v1",
Resource: "infrastructures",
}).Get(context.TODO(), "cluster", metav1.GetOptions{})
if err != nil {
// If the infrastructure resource is not found we assume this is not an OCP cluster
if errors.IsNotFound(err) {
return nil, nil
}
return &infraJSON, err
}
infraData, _ := infra.MarshalJSON()
err = json.Unmarshal(infraData, &infraJSON)
return &infraJSON, err
}
// getVersionInfo obtains OCP and k8s version information
func (meta *Metadata) getVersionInfo() (versionObj, error) {
var cv clusterVersion
var versionInfo versionObj
version, err := meta.clientSet.ServerVersion()
if err != nil {
return versionInfo, err
}
versionInfo.k8sVersion = version.GitVersion
clusterVersion, err := meta.dynamicClient.Resource(
schema.GroupVersionResource{
Group: "config.openshift.io",
Version: "v1",
Resource: "clusterversions",
}).Get(context.TODO(), "version", metav1.GetOptions{})
if err != nil {
// If the clusterversion resource is not found we assume this is not an OCP cluster
if errors.IsNotFound(err) {
return versionInfo, nil
}
return versionInfo, err
}
clusterVersionBytes, _ := clusterVersion.MarshalJSON()
err = json.Unmarshal(clusterVersionBytes, &cv)
if err != nil {
return versionInfo, err
}
for _, update := range cv.Status.History {
if update.State == completedUpdate {
// obtain the version from the last completed update
versionInfo.ocpVersion = update.Version
break
}
}
shortReg, _ := regexp.Compile(`([0-9]\.[0-9]+)-*`)
versionInfo.ocpMajorVersion = shortReg.FindString(versionInfo.ocpVersion)
return versionInfo, err
}
// getNodesInfo returns node information
func (meta *Metadata) getNodesInfo(clusterMetadata *ClusterMetadata) error {
nodes, err := meta.clientSet.CoreV1().Nodes().List(context.TODO(), metav1.ListOptions{})
if err != nil {
return err
}
clusterMetadata.TotalNodes = len(nodes.Items)
// When the master label is found, the node is considered a master, regardless of other labels the node could have
for _, node := range nodes.Items {
if _, ok := node.Labels["node-role.kubernetes.io/master"]; ok { // Check for master role
clusterMetadata.MasterNodesCount++
clusterMetadata.MasterNodesType = node.Labels["node.kubernetes.io/instance-type"]
if _, ok := node.Labels["node-role.kubernetes.io/worker"]; ok {
if len(node.Spec.Taints) == 0 { // When mastersSchedulable is false, master nodes have at least one taint
clusterMetadata.WorkerNodesCount++
}
}
} else if _, ok := node.Labels["node-role.kubernetes.io/control-plane"]; ok { // Check for control-plane role
clusterMetadata.MasterNodesCount++
clusterMetadata.MasterNodesType = node.Labels["node.kubernetes.io/instance-type"]
} else if _, ok := node.Labels["node-role.kubernetes.io/infra"]; ok { // Check for infra role
clusterMetadata.InfraNodesCount++
clusterMetadata.InfraNodesType = node.Labels["node.kubernetes.io/instance-type"]
} else if _, ok := node.Labels["node-role.kubernetes.io/worker"]; ok { // Check for worker role
clusterMetadata.WorkerNodesCount++
clusterMetadata.WorkerNodesType = node.Labels["node.kubernetes.io/instance-type"]
} else {
clusterMetadata.OtherNodesCount++
}
}
return err
}
// getSDNInfo returns SDN type
func (meta *Metadata) getSDNInfo() (string, error) {
networkData, err := meta.dynamicClient.Resource(schema.GroupVersionResource{
Group: "config.openshift.io",
Version: "v1",
Resource: "networks",
}).Get(context.TODO(), "cluster", metav1.GetOptions{})
if err != nil {
return "", err
}
networkType, found, err := unstructured.NestedString(networkData.UnstructuredContent(), "status", "networkType")
if !found {
return "", fmt.Errorf("networkType field not found in config.openshift.io/v1/network/networks/cluster status")
}
return networkType, err
}
func (meta *Metadata) getPublish(installConfig map[string]interface{}) (string, error) {
if val, ok := installConfig["publish"]; ok {
return val.(string), nil
}
return "", nil
}
func (meta *Metadata) getFips(installConfig map[string]interface{}) (bool, error) {
if val, ok := installConfig["fips"]; ok {
return val.(bool), nil
}
return false, nil
}
func (meta *Metadata) getComputeWorkerArch(installConfig map[string]interface{}) (string, error) {
if val, ok := installConfig["compute"]; ok {
for _, val := range val.([]interface{}) {
comConfig := val.(map[string]interface{})
if v, ok := comConfig["name"].(string); ok {
if v == "worker" {
return comConfig["architecture"].(string), nil
}
}
}
}
return "", nil
}
func (meta *Metadata) getControlPlaneArch(installConfig map[string]interface{}) (string, error) {
if val, ok := installConfig["controlPlane"]; ok {
cpConfig := val.(map[string]interface{})
if v, ok := cpConfig["architecture"].(string); ok {
return v, nil
}
}
return "", nil
}
// getIPSec returns if the cluster has IPSec enabled
func (meta *Metadata) getIPSec() (bool, string, error) {
ipsecType := "Disabled"
networks, err := meta.dynamicClient.Resource(schema.GroupVersionResource{
Group: "operator.openshift.io",
Version: "v1",
Resource: "networks",
}).Get(context.TODO(), "cluster", metav1.GetOptions{})
if err != nil {
return false, ipsecType, err
}
ipsecMode, found, err := unstructured.NestedString(networks.UnstructuredContent(), "spec", "defaultNetwork", "ovnKubernetesConfig", "ipsecConfig", "mode")
if !found {
_, found, _ := unstructured.NestedMap(networks.UnstructuredContent(), "spec", "defaultNetwork", "ovnKubernetesConfig", "ipsecConfig")
if !found {
return false, ipsecType, nil
} else {
ipsecType = "Full"
return true, ipsecType, nil
}
}
if err != nil {
return false, ipsecType, fmt.Errorf(err.Error())
}
if ipsecMode != "Disabled" {
return true, ipsecMode, nil
}
return false, ipsecMode, nil
}
// getClusterConfig returns cluster configuration yaml
func (meta *Metadata) getClusterConfig() (map[string]interface{}, error) {
config, err := meta.clientSet.CoreV1().ConfigMaps("kube-system").Get(context.TODO(), "cluster-config-v1", metav1.GetOptions{})
if err != nil {
return nil, err
}
installConfigRaw := config.Data["install-config"]
installConfig, err := toMap(installConfigRaw)
if err != nil {
return nil, err
}
return installConfig, nil
}
func toMap(str string) (map[string]interface{}, error) {
config := map[string]interface{}{}
err := yaml.Unmarshal([]byte(str), &config)
if err != nil {
return nil, err
}
return config, nil
}