mirror of
https://github.com/kubernetes-sigs/prometheus-adapter.git
synced 2026-04-07 02:07:58 +00:00
Some conversation-starting progress.
Still tons of work to do, but it's probably far enough along to get some feedback.
This commit is contained in:
Tony Compton
parent
f49892b097
commit
0af14dc93d
5 changed files with 225 additions and 55 deletions
280
pkg/custom-provider/custom_provider.go
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280
pkg/custom-provider/custom_provider.go
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/*
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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 provider
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import (
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"context"
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"fmt"
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"time"
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"github.com/golang/glog"
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"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
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pmodel "github.com/prometheus/common/model"
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apierr "k8s.io/apimachinery/pkg/api/errors"
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apimeta "k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/api/resource"
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metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/client-go/dynamic"
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"k8s.io/metrics/pkg/apis/custom_metrics"
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prom "github.com/directxman12/k8s-prometheus-adapter/pkg/client"
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)
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type customPrometheusProvider struct {
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mapper apimeta.RESTMapper
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kubeClient dynamic.ClientPool
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promClient prom.Client
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SeriesRegistry
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rateInterval time.Duration
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}
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func NewCustomPrometheusProvider(mapper apimeta.RESTMapper, kubeClient dynamic.ClientPool, promClient prom.Client, labelPrefix string, updateInterval time.Duration, rateInterval time.Duration, stopChan <-chan struct{}) provider.CustomMetricsProvider {
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lister := &cachingMetricsLister{
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updateInterval: updateInterval,
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promClient: promClient,
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SeriesRegistry: &basicSeriesRegistry{
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namer: metricNamer{
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// TODO: populate the overrides list
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overrides: nil,
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mapper: mapper,
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labelPrefix: labelPrefix,
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},
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},
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}
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lister.RunUntil(stopChan)
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return &customPrometheusProvider{
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mapper: mapper,
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kubeClient: kubeClient,
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promClient: promClient,
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SeriesRegistry: lister,
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rateInterval: rateInterval,
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}
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}
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func (p *customPrometheusProvider) metricFor(value pmodel.SampleValue, groupResource schema.GroupResource, namespace string, name string, metricName string) (*custom_metrics.MetricValue, error) {
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kind, err := p.mapper.KindFor(groupResource.WithVersion(""))
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if err != nil {
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return nil, err
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}
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return &custom_metrics.MetricValue{
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DescribedObject: custom_metrics.ObjectReference{
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APIVersion: groupResource.Group + "/" + runtime.APIVersionInternal,
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Kind: kind.Kind,
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Name: name,
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Namespace: namespace,
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},
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MetricName: metricName,
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Timestamp: metaV1.Time{time.Now()},
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Value: *resource.NewMilliQuantity(int64(value*1000.0), resource.DecimalSI).ToDec(),
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}, nil
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}
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func (p *customPrometheusProvider) metricsFor(valueSet pmodel.Vector, info provider.CustomMetricInfo, list runtime.Object) (*custom_metrics.MetricValueList, error) {
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if !apimeta.IsListType(list) {
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return nil, apierr.NewInternalError(fmt.Errorf("result of label selector list operation was not a list"))
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}
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values, found := p.MatchValuesToNames(info, valueSet)
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if !found {
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return nil, provider.NewMetricNotFoundError(info.GroupResource, info.Metric)
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}
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res := []custom_metrics.MetricValue{}
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err := apimeta.EachListItem(list, func(item runtime.Object) error {
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objUnstructured := item.(*unstructured.Unstructured)
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objName := objUnstructured.GetName()
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if _, found := values[objName]; !found {
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return nil
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}
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value, err := p.metricFor(values[objName], info.GroupResource, objUnstructured.GetNamespace(), objName, info.Metric)
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if err != nil {
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return err
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}
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res = append(res, *value)
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return nil
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})
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if err != nil {
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return nil, err
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}
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return &custom_metrics.MetricValueList{
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Items: res,
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}, nil
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}
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func (p *customPrometheusProvider) buildQuery(info provider.CustomMetricInfo, namespace string, names ...string) (pmodel.Vector, error) {
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kind, baseQuery, groupBy, found := p.QueryForMetric(info, namespace, names...)
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if !found {
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return nil, provider.NewMetricNotFoundError(info.GroupResource, info.Metric)
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}
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fullQuery := baseQuery
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switch kind {
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case CounterSeries:
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fullQuery = prom.Selector(fmt.Sprintf("rate(%s[%s])", baseQuery, pmodel.Duration(p.rateInterval).String()))
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case SecondsCounterSeries:
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// TODO: futher modify for seconds?
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fullQuery = prom.Selector(prom.Selector(fmt.Sprintf("rate(%s[%s])", baseQuery, pmodel.Duration(p.rateInterval).String())))
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}
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// NB: too small of a rate interval will return no results...
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// sum over all other dimensions of this query (e.g. if we select on route, sum across all pods,
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// but if we select on pods, sum across all routes), and split by the dimension of our resource
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// TODO: return/populate the by list in SeriesForMetric
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fullQuery = prom.Selector(fmt.Sprintf("sum(%s) by (%s)", fullQuery, groupBy))
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// TODO: use an actual context
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queryResults, err := p.promClient.Query(context.Background(), pmodel.Now(), fullQuery)
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if err != nil {
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glog.Errorf("unable to fetch metrics from prometheus: %v", err)
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// don't leak implementation details to the user
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return nil, apierr.NewInternalError(fmt.Errorf("unable to fetch metrics"))
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}
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if queryResults.Type != pmodel.ValVector {
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glog.Errorf("unexpected results from prometheus: expected %s, got %s on results %v", pmodel.ValVector, queryResults.Type, queryResults)
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return nil, apierr.NewInternalError(fmt.Errorf("unable to fetch metrics"))
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}
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return *queryResults.Vector, nil
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}
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func (p *customPrometheusProvider) getSingle(info provider.CustomMetricInfo, namespace, name string) (*custom_metrics.MetricValue, error) {
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queryResults, err := p.buildQuery(info, namespace, name)
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if err != nil {
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return nil, err
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}
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if len(queryResults) < 1 {
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return nil, provider.NewMetricNotFoundForError(info.GroupResource, info.Metric, name)
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}
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namedValues, found := p.MatchValuesToNames(info, queryResults)
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if !found {
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return nil, provider.NewMetricNotFoundError(info.GroupResource, info.Metric)
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}
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if len(namedValues) > 1 {
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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)
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}
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resultValue, nameFound := namedValues[name]
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if !nameFound {
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glog.Errorf("None of the results returned by when fetching metric %s for %q matched the resource name", info.String(), name)
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return nil, provider.NewMetricNotFoundForError(info.GroupResource, info.Metric, name)
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}
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return p.metricFor(resultValue, info.GroupResource, "", name, info.Metric)
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}
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func (p *customPrometheusProvider) getMultiple(info provider.CustomMetricInfo, namespace string, selector labels.Selector) (*custom_metrics.MetricValueList, error) {
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// construct a client to list the names of objects matching the label selector
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client, err := p.kubeClient.ClientForGroupVersionResource(info.GroupResource.WithVersion(""))
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if err != nil {
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glog.Errorf("unable to construct dynamic client to list matching resource names: %v", err)
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// don't leak implementation details to the user
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return nil, apierr.NewInternalError(fmt.Errorf("unable to list matching resources"))
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}
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// we can construct a this APIResource ourself, since the dynamic client only uses Name and Namespaced
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apiRes := &metaV1.APIResource{
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Name: info.GroupResource.Resource,
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Namespaced: info.Namespaced,
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}
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// actually list the objects matching the label selector
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matchingObjectsRaw, err := client.Resource(apiRes, namespace).
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List(metaV1.ListOptions{LabelSelector: selector.String()})
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if err != nil {
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glog.Errorf("unable to list matching resource names: %v", err)
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// don't leak implementation details to the user
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return nil, apierr.NewInternalError(fmt.Errorf("unable to list matching resources"))
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}
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// make sure we have a list
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if !apimeta.IsListType(matchingObjectsRaw) {
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return nil, apierr.NewInternalError(fmt.Errorf("result of label selector list operation was not a list"))
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}
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// convert a list of objects into the corresponding list of names
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resourceNames := []string{}
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err = apimeta.EachListItem(matchingObjectsRaw, func(item runtime.Object) error {
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objName := item.(*unstructured.Unstructured).GetName()
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resourceNames = append(resourceNames, objName)
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return nil
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})
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// construct the actual query
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queryResults, err := p.buildQuery(info, namespace, resourceNames...)
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if err != nil {
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return nil, err
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}
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return p.metricsFor(queryResults, info, matchingObjectsRaw)
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}
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func (p *customPrometheusProvider) GetRootScopedMetricByName(groupResource schema.GroupResource, name string, metricName string) (*custom_metrics.MetricValue, error) {
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info := provider.CustomMetricInfo{
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GroupResource: groupResource,
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Metric: metricName,
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Namespaced: false,
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}
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return p.getSingle(info, "", name)
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}
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func (p *customPrometheusProvider) GetRootScopedMetricBySelector(groupResource schema.GroupResource, selector labels.Selector, metricName string) (*custom_metrics.MetricValueList, error) {
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info := provider.CustomMetricInfo{
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GroupResource: groupResource,
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Metric: metricName,
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Namespaced: false,
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}
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return p.getMultiple(info, "", selector)
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}
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func (p *customPrometheusProvider) GetNamespacedMetricByName(groupResource schema.GroupResource, namespace string, name string, metricName string) (*custom_metrics.MetricValue, error) {
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info := provider.CustomMetricInfo{
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GroupResource: groupResource,
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Metric: metricName,
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Namespaced: true,
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}
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return p.getSingle(info, namespace, name)
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}
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func (p *customPrometheusProvider) GetNamespacedMetricBySelector(groupResource schema.GroupResource, namespace string, selector labels.Selector, metricName string) (*custom_metrics.MetricValueList, error) {
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info := provider.CustomMetricInfo{
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GroupResource: groupResource,
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Metric: metricName,
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Namespaced: true,
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}
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return p.getMultiple(info, namespace, selector)
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}
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