mirror of
https://github.com/kubernetes-sigs/prometheus-adapter.git
synced 2026-04-06 01:38:10 +00:00
58a9769eaa
This commit switches to using the boilerplate versions of a couple different utilities, including the metric info normalization and the common error types.
322 lines
11 KiB
Go
322 lines
11 KiB
Go
/*
|
|
Copyright 2017 The Kubernetes 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 provider
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"github.com/golang/glog"
|
|
"time"
|
|
|
|
"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
|
|
pmodel "github.com/prometheus/common/model"
|
|
apierr "k8s.io/apimachinery/pkg/api/errors"
|
|
apimeta "k8s.io/apimachinery/pkg/api/meta"
|
|
"k8s.io/apimachinery/pkg/api/resource"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
|
|
"k8s.io/apimachinery/pkg/labels"
|
|
"k8s.io/apimachinery/pkg/runtime"
|
|
"k8s.io/apimachinery/pkg/runtime/schema"
|
|
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
|
|
"k8s.io/apimachinery/pkg/util/wait"
|
|
"k8s.io/client-go/dynamic"
|
|
"k8s.io/client-go/pkg/api"
|
|
_ "k8s.io/client-go/pkg/api/install"
|
|
"k8s.io/metrics/pkg/apis/custom_metrics"
|
|
|
|
prom "github.com/directxman12/k8s-prometheus-adapter/pkg/client"
|
|
)
|
|
|
|
type prometheusProvider struct {
|
|
mapper apimeta.RESTMapper
|
|
kubeClient dynamic.ClientPool
|
|
promClient prom.Client
|
|
|
|
SeriesRegistry
|
|
|
|
rateInterval time.Duration
|
|
}
|
|
|
|
func NewPrometheusProvider(mapper apimeta.RESTMapper, kubeClient dynamic.ClientPool, promClient prom.Client, updateInterval time.Duration, rateInterval time.Duration, stopChan <-chan struct{}) provider.CustomMetricsProvider {
|
|
lister := &cachingMetricsLister{
|
|
updateInterval: updateInterval,
|
|
promClient: promClient,
|
|
|
|
SeriesRegistry: &basicSeriesRegistry{
|
|
namer: metricNamer{
|
|
// TODO: populate the overrides list
|
|
overrides: nil,
|
|
mapper: mapper,
|
|
},
|
|
},
|
|
}
|
|
|
|
lister.RunUntil(stopChan)
|
|
|
|
return &prometheusProvider{
|
|
mapper: mapper,
|
|
kubeClient: kubeClient,
|
|
promClient: promClient,
|
|
|
|
SeriesRegistry: lister,
|
|
|
|
rateInterval: rateInterval,
|
|
}
|
|
}
|
|
|
|
func (p *prometheusProvider) metricFor(value pmodel.SampleValue, groupResource schema.GroupResource, namespace string, name string, metricName string) (*custom_metrics.MetricValue, error) {
|
|
kind, err := p.mapper.KindFor(groupResource.WithVersion(""))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &custom_metrics.MetricValue{
|
|
DescribedObject: api.ObjectReference{
|
|
APIVersion: groupResource.Group + "/" + runtime.APIVersionInternal,
|
|
Kind: kind.Kind,
|
|
Name: name,
|
|
Namespace: namespace,
|
|
},
|
|
MetricName: metricName,
|
|
Timestamp: metav1.Time{time.Now()},
|
|
Value: *resource.NewMilliQuantity(int64(value*1000.0), resource.DecimalSI),
|
|
}, nil
|
|
}
|
|
|
|
func (p *prometheusProvider) metricsFor(valueSet pmodel.Vector, info provider.MetricInfo, list runtime.Object) (*custom_metrics.MetricValueList, error) {
|
|
if !apimeta.IsListType(list) {
|
|
return nil, apierr.NewInternalError(fmt.Errorf("result of label selector list operation was not a list"))
|
|
}
|
|
|
|
values, found := p.MatchValuesToNames(info, valueSet)
|
|
if !found {
|
|
return nil, provider.NewMetricNotFoundError(info.GroupResource, info.Metric)
|
|
}
|
|
res := []custom_metrics.MetricValue{}
|
|
|
|
err := apimeta.EachListItem(list, func(item runtime.Object) error {
|
|
objUnstructured := item.(*unstructured.Unstructured)
|
|
objName := objUnstructured.GetName()
|
|
if _, found := values[objName]; !found {
|
|
return nil
|
|
}
|
|
value, err := p.metricFor(values[objName], info.GroupResource, objUnstructured.GetNamespace(), objName, info.Metric)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
res = append(res, *value)
|
|
|
|
return nil
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &custom_metrics.MetricValueList{
|
|
Items: res,
|
|
}, nil
|
|
}
|
|
|
|
func (p *prometheusProvider) buildQuery(info provider.MetricInfo, namespace string, names ...string) (pmodel.Vector, error) {
|
|
kind, baseQuery, groupBy, found := p.QueryForMetric(info, namespace, names...)
|
|
if !found {
|
|
return nil, provider.NewMetricNotFoundError(info.GroupResource, info.Metric)
|
|
}
|
|
|
|
fullQuery := baseQuery
|
|
switch kind {
|
|
case CounterSeries:
|
|
fullQuery = prom.Selector(fmt.Sprintf("rate(%s[%s])", baseQuery, pmodel.Duration(p.rateInterval).String()))
|
|
case SecondsCounterSeries:
|
|
// TODO: futher modify for seconds?
|
|
fullQuery = prom.Selector(prom.Selector(fmt.Sprintf("rate(%s[%s])", baseQuery, pmodel.Duration(p.rateInterval).String())))
|
|
}
|
|
|
|
// NB: too small of a rate interval will return no results...
|
|
|
|
// sum over all other dimensions of this query (e.g. if we select on route, sum across all pods,
|
|
// but if we select on pods, sum across all routes), and split by the dimension of our resource
|
|
// TODO: return/populate the by list in SeriesForMetric
|
|
fullQuery = prom.Selector(fmt.Sprintf("sum(%s) by (%s)", fullQuery, groupBy))
|
|
|
|
// TODO: use an actual context
|
|
queryResults, err := p.promClient.Query(context.Background(), pmodel.Now(), fullQuery)
|
|
if err != nil {
|
|
glog.Errorf("unable to fetch metrics from prometheus: %v", err)
|
|
// don't leak implementation details to the user
|
|
return nil, apierr.NewInternalError(fmt.Errorf("unable to fetch metrics"))
|
|
}
|
|
|
|
if queryResults.Type != pmodel.ValVector {
|
|
glog.Errorf("unexpected results from prometheus: expected %s, got %s on results %v", pmodel.ValVector, queryResults.Type, queryResults)
|
|
return nil, apierr.NewInternalError(fmt.Errorf("unable to fetch metrics"))
|
|
}
|
|
|
|
return *queryResults.Vector, nil
|
|
}
|
|
|
|
func (p *prometheusProvider) getSingle(info provider.MetricInfo, namespace, name string) (*custom_metrics.MetricValue, error) {
|
|
queryResults, err := p.buildQuery(info, namespace, name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if len(queryResults) < 1 {
|
|
return nil, provider.NewMetricNotFoundForError(info.GroupResource, info.Metric, name)
|
|
}
|
|
|
|
namedValues, found := p.MatchValuesToNames(info, queryResults)
|
|
if !found {
|
|
return nil, provider.NewMetricNotFoundError(info.GroupResource, info.Metric)
|
|
}
|
|
|
|
if len(namedValues) > 1 {
|
|
glog.V(2).Infof("Got more than one result (%v results) when fetching metric %s for %q, using the first one with a matching name...", len(queryResults), info.String(), name)
|
|
}
|
|
|
|
resultValue, nameFound := namedValues[name]
|
|
if !nameFound {
|
|
glog.Errorf("None of the results returned by when fetching metric %s for %q matched the resource name", info.String(), name)
|
|
return nil, provider.NewMetricNotFoundForError(info.GroupResource, info.Metric, name)
|
|
}
|
|
|
|
return p.metricFor(resultValue, info.GroupResource, "", name, info.Metric)
|
|
}
|
|
|
|
func (p *prometheusProvider) getMultiple(info provider.MetricInfo, namespace string, selector labels.Selector) (*custom_metrics.MetricValueList, error) {
|
|
// construct a client to list the names of objects matching the label selector
|
|
client, err := p.kubeClient.ClientForGroupVersionResource(info.GroupResource.WithVersion(""))
|
|
if err != nil {
|
|
glog.Errorf("unable to construct dynamic client to list matching resource names: %v", err)
|
|
// don't leak implementation details to the user
|
|
return nil, apierr.NewInternalError(fmt.Errorf("unable to list matching resources"))
|
|
}
|
|
|
|
// we can construct a this APIResource ourself, since the dynamic client only uses Name and Namespaced
|
|
apiRes := &metav1.APIResource{
|
|
Name: info.GroupResource.Resource,
|
|
Namespaced: info.Namespaced,
|
|
}
|
|
|
|
// actually list the objects matching the label selector
|
|
matchingObjectsRaw, err := client.Resource(apiRes, namespace).
|
|
List(metav1.ListOptions{LabelSelector: selector.String()})
|
|
if err != nil {
|
|
glog.Errorf("unable to list matching resource names: %v", err)
|
|
// don't leak implementation details to the user
|
|
return nil, apierr.NewInternalError(fmt.Errorf("unable to list matching resources"))
|
|
}
|
|
|
|
// make sure we have a list
|
|
if !apimeta.IsListType(matchingObjectsRaw) {
|
|
return nil, apierr.NewInternalError(fmt.Errorf("result of label selector list operation was not a list"))
|
|
}
|
|
|
|
// convert a list of objects into the corresponding list of names
|
|
resourceNames := []string{}
|
|
err = apimeta.EachListItem(matchingObjectsRaw, func(item runtime.Object) error {
|
|
objName := item.(*unstructured.Unstructured).GetName()
|
|
resourceNames = append(resourceNames, objName)
|
|
return nil
|
|
})
|
|
|
|
// construct the actual query
|
|
queryResults, err := p.buildQuery(info, namespace, resourceNames...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return p.metricsFor(queryResults, info, matchingObjectsRaw)
|
|
}
|
|
|
|
func (p *prometheusProvider) GetRootScopedMetricByName(groupResource schema.GroupResource, name string, metricName string) (*custom_metrics.MetricValue, error) {
|
|
info := provider.MetricInfo{
|
|
GroupResource: groupResource,
|
|
Metric: metricName,
|
|
Namespaced: false,
|
|
}
|
|
|
|
return p.getSingle(info, "", name)
|
|
}
|
|
|
|
func (p *prometheusProvider) GetRootScopedMetricBySelector(groupResource schema.GroupResource, selector labels.Selector, metricName string) (*custom_metrics.MetricValueList, error) {
|
|
info := provider.MetricInfo{
|
|
GroupResource: groupResource,
|
|
Metric: metricName,
|
|
Namespaced: false,
|
|
}
|
|
return p.getMultiple(info, "", selector)
|
|
}
|
|
|
|
func (p *prometheusProvider) GetNamespacedMetricByName(groupResource schema.GroupResource, namespace string, name string, metricName string) (*custom_metrics.MetricValue, error) {
|
|
info := provider.MetricInfo{
|
|
GroupResource: groupResource,
|
|
Metric: metricName,
|
|
Namespaced: true,
|
|
}
|
|
|
|
return p.getSingle(info, namespace, name)
|
|
}
|
|
|
|
func (p *prometheusProvider) GetNamespacedMetricBySelector(groupResource schema.GroupResource, namespace string, selector labels.Selector, metricName string) (*custom_metrics.MetricValueList, error) {
|
|
info := provider.MetricInfo{
|
|
GroupResource: groupResource,
|
|
Metric: metricName,
|
|
Namespaced: true,
|
|
}
|
|
return p.getMultiple(info, namespace, selector)
|
|
}
|
|
|
|
type cachingMetricsLister struct {
|
|
SeriesRegistry
|
|
|
|
promClient prom.Client
|
|
updateInterval time.Duration
|
|
}
|
|
|
|
func (l *cachingMetricsLister) Run() {
|
|
l.RunUntil(wait.NeverStop)
|
|
}
|
|
|
|
func (l *cachingMetricsLister) RunUntil(stopChan <-chan struct{}) {
|
|
go wait.Until(func() {
|
|
if err := l.updateMetrics(); err != nil {
|
|
utilruntime.HandleError(err)
|
|
}
|
|
}, l.updateInterval, stopChan)
|
|
}
|
|
|
|
func (l *cachingMetricsLister) updateMetrics() error {
|
|
startTime := pmodel.Now().Add(-1 * l.updateInterval)
|
|
|
|
// container-specific metrics from cAdvsior have their own form, and need special handling
|
|
containerSel := prom.MatchSeries("", prom.NameMatches("^container_.*"), prom.LabelNeq("container_name", "POD"), prom.LabelNeq("namespace", ""), prom.LabelNeq("pod_name", ""))
|
|
namespacedSel := prom.MatchSeries("", prom.LabelNeq("namespace", ""), prom.NameNotMatches("^container_.*"))
|
|
// TODO: figure out how to determine which metrics on non-namespaced objects are kubernetes-related
|
|
|
|
// TODO: use an actual context here
|
|
series, err := l.promClient.Series(context.Background(), pmodel.Interval{startTime, 0}, containerSel, namespacedSel)
|
|
if err != nil {
|
|
return fmt.Errorf("unable to update list of all available metrics: %v", err)
|
|
}
|
|
|
|
glog.V(10).Infof("Set available metric list from Prometheus to: %v", series)
|
|
|
|
l.SetSeries(series)
|
|
|
|
return nil
|
|
}
|