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metricsclient.go
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metricsclient.go
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package metricsclient
import (
"fmt"
"io/ioutil"
"net"
"strconv"
"strings"
"github.com/kubernetes-sigs/custom-metrics-apiserver/pkg/provider"
"github.com/spf13/pflag"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/discovery"
cachedDiscovery "k8s.io/client-go/discovery/cached"
"k8s.io/client-go/rest"
certutil "k8s.io/client-go/util/cert"
"k8s.io/klog"
"k8s.io/metrics/pkg/apis/custom_metrics"
customMetricsAPI "k8s.io/metrics/pkg/apis/custom_metrics/v1beta1"
"k8s.io/metrics/pkg/apis/custom_metrics/v1beta2"
"k8s.io/metrics/pkg/apis/external_metrics"
externalMetricsAPI "k8s.io/metrics/pkg/apis/external_metrics/v1beta1"
cmClient "k8s.io/metrics/pkg/client/custom_metrics"
emClient "k8s.io/metrics/pkg/client/external_metrics"
)
var (
tokenFile = pflag.String("token-file", "/var/run/secrets/kubernetes.io/serviceaccount/token", "path to token file")
rootCAFile = pflag.String("root-ca-faile", "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt", "path to root CA file")
)
type Client struct {
customMetricsClient cmClient.CustomMetricsClient
externalMetricsClient emClient.ExternalMetricsClient
discoveryClient discovery.CachedDiscoveryInterface
mapper meta.RESTMapper
namespace string
name string
}
// InClusterConfig returns a config object which uses the service account
// kubernetes gives to pods. It's intended for clients that expect to be
// running inside a pod running on kubernetes. It will return ErrNotInCluster
// if called from a process not running in a kubernetes environment.
func InClusterConfig(host, port string, insecure bool) (*rest.Config, error) {
token, err := ioutil.ReadFile(*tokenFile)
if err != nil {
return nil, err
}
var tlsClientConfig rest.TLSClientConfig
if insecure {
tlsClientConfig.Insecure = true
} else {
if _, err := certutil.NewPool(*rootCAFile); err != nil {
klog.Errorf("Expected to load root CA config from %s, but got err: %v", *rootCAFile, err)
} else {
tlsClientConfig.CAFile = *rootCAFile
}
}
return &rest.Config{
// TODO: switch to using cluster DNS.
Host: "https://" + net.JoinHostPort(host, port),
// Host: "https://localhost:6443",
TLSClientConfig: tlsClientConfig,
BearerToken: string(token),
BearerTokenFile: *tokenFile,
}, nil
}
func NewClient(insecureTLSSkipVerify bool, name, namespace string, port int32, mapper meta.RESTMapper) (*Client, error) {
host := fmt.Sprintf("%s.%s", name, namespace)
config, err := InClusterConfig(host, strconv.Itoa(int(port)), insecureTLSSkipVerify)
if err != nil {
return nil, fmt.Errorf("failed to generate rest config for %s: %v", host, err)
}
discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
if err != nil {
return nil, fmt.Errorf("failed to create discovery client: %v", err)
}
cachedClient := cachedDiscovery.NewMemCacheClient(discoveryClient)
customMetricsClient := cmClient.NewForConfig(config, mapper, cmClient.NewAvailableAPIsGetter(discoveryClient))
externalMetricsClient, err := emClient.NewForConfig(config)
if err != nil {
return nil, fmt.Errorf("failed to create external metrics client: %v", err)
}
return &Client{
name: name,
namespace: namespace,
customMetricsClient: customMetricsClient,
externalMetricsClient: externalMetricsClient,
discoveryClient: cachedClient,
mapper: mapper,
}, err
}
func (c *Client) ListCustomMetricInfos() (map[provider.CustomMetricInfo]struct{}, error) {
resources, err := c.discoveryClient.ServerResourcesForGroupVersion(customMetricsAPI.SchemeGroupVersion.String())
if err != nil {
return nil, fmt.Errorf("failed to get resource for %s: %v", customMetricsAPI.SchemeGroupVersion, err)
}
metricInfos := make(map[provider.CustomMetricInfo]struct{})
for _, r := range resources.APIResources {
parts := strings.SplitN(r.Name, "/", 2)
if len(parts) != 2 {
klog.Warningf("provider %s/%s returned a malformed metrics with name %s", c.namespace, c.name, r.Name)
continue
}
resource, err := c.mapper.ResourceFor(schema.GroupVersionResource{Resource: parts[0]})
if err != nil {
klog.Warningf("failed to get group version for resource %s from provider %s/%s", parts[0], c.namespace, c.name)
continue
}
info := provider.CustomMetricInfo{
GroupResource: schema.GroupResource{Group: resource.Group, Resource: resource.Resource},
Namespaced: r.Namespaced, Metric: parts[1],
}
metricInfos[info] = struct{}{}
}
return metricInfos, nil
}
func (c *Client) GetMetricByName(name types.NamespacedName, info provider.CustomMetricInfo, selector labels.Selector) (*custom_metrics.MetricValue, error) {
var object *v1beta2.MetricValue
var err error
if info.Namespaced {
object, err = c.customMetricsClient.NamespacedMetrics(name.Namespace).GetForObject(
schema.GroupKind{Group: info.GroupResource.Group, Kind: info.GroupResource.Resource},
name.Name, info.Metric, selector,
)
} else {
object, err = c.customMetricsClient.RootScopedMetrics().GetForObject(
schema.GroupKind{Group: info.GroupResource.Group, Kind: info.GroupResource.Resource},
name.Name, info.Metric, selector,
)
}
if err != nil {
return nil, fmt.Errorf("failed to get metric from backend: %v", err)
}
return &custom_metrics.MetricValue{
DescribedObject: custom_metrics.ObjectReference{
Kind: object.DescribedObject.Kind,
Namespace: object.DescribedObject.Namespace,
Name: object.DescribedObject.Name,
APIVersion: object.DescribedObject.APIVersion,
ResourceVersion: object.DescribedObject.ResourceVersion,
},
Metric: custom_metrics.MetricIdentifier{
Name: object.Metric.Name,
Selector: object.Metric.Selector,
},
Timestamp: object.Timestamp,
WindowSeconds: object.WindowSeconds,
Value: object.Value,
}, nil
}
func (c *Client) GetMetricBySelector(namespace string, selector labels.Selector, info provider.CustomMetricInfo, metricSelector labels.Selector) (*custom_metrics.MetricValueList, error) {
var objects *v1beta2.MetricValueList
var err error
kind, err := c.mapper.ResourceSingularizer(info.GroupResource.Resource)
if err != nil {
return nil, fmt.Errorf("failed to singularize %s: %v", info.GroupResource.Resource, err)
}
klog.Infof("custom metric info: %#v", info)
if info.Namespaced {
objects, err = c.customMetricsClient.NamespacedMetrics(namespace).GetForObjects(
schema.GroupKind{
Group: info.GroupResource.Group,
Kind: kind,
},
selector, info.Metric, metricSelector,
)
} else {
objects, err = c.customMetricsClient.RootScopedMetrics().GetForObjects(
schema.GroupKind{
Group: info.GroupResource.Group,
Kind: kind,
},
selector, info.Metric, metricSelector,
)
}
if err != nil {
return nil, fmt.Errorf("failed to get metric from backend: %v", err)
}
values := make([]custom_metrics.MetricValue, len(objects.Items))
for i, v := range objects.Items {
values[i] = custom_metrics.MetricValue{
DescribedObject: custom_metrics.ObjectReference{
Kind: v.DescribedObject.Kind,
Namespace: v.DescribedObject.Namespace,
Name: v.DescribedObject.Name,
APIVersion: v.DescribedObject.APIVersion,
ResourceVersion: v.DescribedObject.ResourceVersion,
},
Metric: custom_metrics.MetricIdentifier{
Name: v.Metric.Name,
Selector: v.Metric.Selector,
},
Timestamp: v.Timestamp,
WindowSeconds: v.WindowSeconds,
Value: v.Value,
}
}
return &custom_metrics.MetricValueList{
Items: values,
}, nil
}
func (c *Client) ListExternalMetrics() (map[provider.ExternalMetricInfo]struct{}, error) {
infos := make(map[provider.ExternalMetricInfo]struct{})
resources, err := c.discoveryClient.ServerResourcesForGroupVersion(externalMetricsAPI.SchemeGroupVersion.String())
if err != nil {
return nil, fmt.Errorf("failed to get resource for %s: %v", externalMetricsAPI.SchemeGroupVersion, err)
}
for _, r := range resources.APIResources {
info := provider.ExternalMetricInfo{
Metric: r.Name,
}
infos[info] = struct{}{}
}
return infos, nil
}
func (c *Client) GetExternalMetric(name, namespace string, selector labels.Selector) (*external_metrics.ExternalMetricValueList, error) {
result, err := c.externalMetricsClient.NamespacedMetrics(namespace).List(name, selector)
if err != nil {
return nil, fmt.Errorf("failed to get metrics for external metric %s/%s: %v", namespace, name, err)
}
valueList := &external_metrics.ExternalMetricValueList{
Items: make([]external_metrics.ExternalMetricValue, len(result.Items)),
}
for i, m := range result.Items {
valueList.Items[i] = external_metrics.ExternalMetricValue{
TypeMeta: metav1.TypeMeta{Kind: m.Kind, APIVersion: m.APIVersion},
MetricName: m.MetricName,
MetricLabels: m.MetricLabels,
Timestamp: m.Timestamp,
WindowSeconds: m.WindowSeconds,
Value: m.Value,
}
}
return valueList, nil
}