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508 lines
15 KiB
508 lines
15 KiB
// Copyright 2020 The Prometheus 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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package kubernetes
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import (
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"context"
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"errors"
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"fmt"
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"log/slog"
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"net"
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"strconv"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/model"
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"github.com/prometheus/common/promslog"
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apiv1 "k8s.io/api/core/v1"
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v1 "k8s.io/api/discovery/v1"
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"k8s.io/client-go/tools/cache"
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"k8s.io/client-go/util/workqueue"
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"github.com/prometheus/prometheus/discovery/targetgroup"
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"github.com/prometheus/prometheus/util/strutil"
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)
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// EndpointSlice discovers new endpoint targets.
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type EndpointSlice struct {
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logger *slog.Logger
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endpointSliceInf cache.SharedIndexInformer
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serviceInf cache.SharedInformer
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podInf cache.SharedInformer
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nodeInf cache.SharedInformer
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withNodeMetadata bool
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podStore cache.Store
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endpointSliceStore cache.Store
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serviceStore cache.Store
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queue *workqueue.Type
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}
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// NewEndpointSlice returns a new endpointslice discovery.
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func NewEndpointSlice(l *slog.Logger, eps cache.SharedIndexInformer, svc, pod, node cache.SharedInformer, eventCount *prometheus.CounterVec) *EndpointSlice {
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if l == nil {
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l = promslog.NewNopLogger()
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}
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epslAddCount := eventCount.WithLabelValues(RoleEndpointSlice.String(), MetricLabelRoleAdd)
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epslUpdateCount := eventCount.WithLabelValues(RoleEndpointSlice.String(), MetricLabelRoleUpdate)
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epslDeleteCount := eventCount.WithLabelValues(RoleEndpointSlice.String(), MetricLabelRoleDelete)
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svcAddCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleAdd)
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svcUpdateCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleUpdate)
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svcDeleteCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleDelete)
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e := &EndpointSlice{
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logger: l,
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endpointSliceInf: eps,
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endpointSliceStore: eps.GetStore(),
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serviceInf: svc,
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serviceStore: svc.GetStore(),
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podInf: pod,
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podStore: pod.GetStore(),
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nodeInf: node,
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withNodeMetadata: node != nil,
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queue: workqueue.NewNamed(RoleEndpointSlice.String()),
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}
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_, err := e.endpointSliceInf.AddEventHandler(cache.ResourceEventHandlerFuncs{
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AddFunc: func(o interface{}) {
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epslAddCount.Inc()
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e.enqueue(o)
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},
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UpdateFunc: func(_, o interface{}) {
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epslUpdateCount.Inc()
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e.enqueue(o)
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},
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DeleteFunc: func(o interface{}) {
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epslDeleteCount.Inc()
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e.enqueue(o)
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},
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})
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if err != nil {
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l.Error("Error adding endpoint slices event handler.", "err", err)
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}
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serviceUpdate := func(o interface{}) {
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svc, err := convertToService(o)
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if err != nil {
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e.logger.Error("converting to Service object failed", "err", err)
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return
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}
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// TODO(brancz): use cache.Indexer to index endpointslices by
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// LabelServiceName so this operation doesn't have to iterate over all
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// endpoint objects.
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for _, obj := range e.endpointSliceStore.List() {
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esa, err := e.getEndpointSliceAdaptor(obj)
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if err != nil {
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e.logger.Error("converting to EndpointSlice object failed", "err", err)
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continue
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}
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if lv, exists := esa.labels()[esa.labelServiceName()]; exists && lv == svc.Name {
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e.enqueue(esa.get())
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}
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}
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}
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_, err = e.serviceInf.AddEventHandler(cache.ResourceEventHandlerFuncs{
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AddFunc: func(o interface{}) {
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svcAddCount.Inc()
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serviceUpdate(o)
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},
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UpdateFunc: func(_, o interface{}) {
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svcUpdateCount.Inc()
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serviceUpdate(o)
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},
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DeleteFunc: func(o interface{}) {
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svcDeleteCount.Inc()
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serviceUpdate(o)
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},
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})
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if err != nil {
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l.Error("Error adding services event handler.", "err", err)
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}
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if e.withNodeMetadata {
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_, err = e.nodeInf.AddEventHandler(cache.ResourceEventHandlerFuncs{
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AddFunc: func(o interface{}) {
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node := o.(*apiv1.Node)
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e.enqueueNode(node.Name)
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},
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UpdateFunc: func(_, o interface{}) {
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node := o.(*apiv1.Node)
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e.enqueueNode(node.Name)
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},
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DeleteFunc: func(o interface{}) {
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nodeName, err := nodeName(o)
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if err != nil {
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l.Error("Error getting Node name", "err", err)
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}
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e.enqueueNode(nodeName)
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},
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})
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if err != nil {
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l.Error("Error adding nodes event handler.", "err", err)
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}
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}
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return e
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}
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func (e *EndpointSlice) enqueueNode(nodeName string) {
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endpoints, err := e.endpointSliceInf.GetIndexer().ByIndex(nodeIndex, nodeName)
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if err != nil {
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e.logger.Error("Error getting endpoints for node", "node", nodeName, "err", err)
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return
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}
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for _, endpoint := range endpoints {
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e.enqueue(endpoint)
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}
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}
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func (e *EndpointSlice) enqueue(obj interface{}) {
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key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
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if err != nil {
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return
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}
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e.queue.Add(key)
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}
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// Run implements the Discoverer interface.
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func (e *EndpointSlice) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
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defer e.queue.ShutDown()
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cacheSyncs := []cache.InformerSynced{e.endpointSliceInf.HasSynced, e.serviceInf.HasSynced, e.podInf.HasSynced}
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if e.withNodeMetadata {
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cacheSyncs = append(cacheSyncs, e.nodeInf.HasSynced)
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}
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if !cache.WaitForCacheSync(ctx.Done(), cacheSyncs...) {
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if !errors.Is(ctx.Err(), context.Canceled) {
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e.logger.Error("endpointslice informer unable to sync cache")
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}
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return
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}
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go func() {
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for e.process(ctx, ch) {
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}
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}()
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// Block until the target provider is explicitly canceled.
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<-ctx.Done()
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}
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func (e *EndpointSlice) process(ctx context.Context, ch chan<- []*targetgroup.Group) bool {
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keyObj, quit := e.queue.Get()
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if quit {
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return false
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}
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defer e.queue.Done(keyObj)
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key := keyObj.(string)
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namespace, name, err := cache.SplitMetaNamespaceKey(key)
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if err != nil {
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e.logger.Error("splitting key failed", "key", key)
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return true
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}
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o, exists, err := e.endpointSliceStore.GetByKey(key)
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if err != nil {
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e.logger.Error("getting object from store failed", "key", key)
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return true
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}
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if !exists {
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send(ctx, ch, &targetgroup.Group{Source: endpointSliceSourceFromNamespaceAndName(namespace, name)})
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return true
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}
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esa, err := e.getEndpointSliceAdaptor(o)
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if err != nil {
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e.logger.Error("converting to EndpointSlice object failed", "err", err)
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return true
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}
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send(ctx, ch, e.buildEndpointSlice(esa))
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return true
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}
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func (e *EndpointSlice) getEndpointSliceAdaptor(o interface{}) (endpointSliceAdaptor, error) {
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switch endpointSlice := o.(type) {
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case *v1.EndpointSlice:
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return newEndpointSliceAdaptorFromV1(endpointSlice), nil
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default:
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return nil, fmt.Errorf("received unexpected object: %v", o)
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}
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}
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func endpointSliceSource(ep endpointSliceAdaptor) string {
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return endpointSliceSourceFromNamespaceAndName(ep.namespace(), ep.name())
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}
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func endpointSliceSourceFromNamespaceAndName(namespace, name string) string {
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return "endpointslice/" + namespace + "/" + name
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}
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const (
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endpointSliceAddressTypeLabel = metaLabelPrefix + "endpointslice_address_type"
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endpointSlicePortNameLabel = metaLabelPrefix + "endpointslice_port_name"
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endpointSlicePortProtocolLabel = metaLabelPrefix + "endpointslice_port_protocol"
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endpointSlicePortLabel = metaLabelPrefix + "endpointslice_port"
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endpointSlicePortAppProtocol = metaLabelPrefix + "endpointslice_port_app_protocol"
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endpointSliceEndpointConditionsReadyLabel = metaLabelPrefix + "endpointslice_endpoint_conditions_ready"
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endpointSliceEndpointConditionsServingLabel = metaLabelPrefix + "endpointslice_endpoint_conditions_serving"
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endpointSliceEndpointConditionsTerminatingLabel = metaLabelPrefix + "endpointslice_endpoint_conditions_terminating"
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endpointSliceEndpointZoneLabel = metaLabelPrefix + "endpointslice_endpoint_zone"
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endpointSliceEndpointHostnameLabel = metaLabelPrefix + "endpointslice_endpoint_hostname"
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endpointSliceEndpointNodenameLabel = metaLabelPrefix + "endpointslice_endpoint_node_name"
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endpointSliceAddressTargetKindLabel = metaLabelPrefix + "endpointslice_address_target_kind"
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endpointSliceAddressTargetNameLabel = metaLabelPrefix + "endpointslice_address_target_name"
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endpointSliceEndpointTopologyLabelPrefix = metaLabelPrefix + "endpointslice_endpoint_topology_"
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endpointSliceEndpointTopologyLabelPresentPrefix = metaLabelPrefix + "endpointslice_endpoint_topology_present_"
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)
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func (e *EndpointSlice) buildEndpointSlice(eps endpointSliceAdaptor) *targetgroup.Group {
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tg := &targetgroup.Group{
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Source: endpointSliceSource(eps),
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}
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tg.Labels = model.LabelSet{
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namespaceLabel: lv(eps.namespace()),
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endpointSliceAddressTypeLabel: lv(eps.addressType()),
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}
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addObjectMetaLabels(tg.Labels, eps.getObjectMeta(), RoleEndpointSlice)
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e.addServiceLabels(eps, tg)
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type podEntry struct {
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pod *apiv1.Pod
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servicePorts []endpointSlicePortAdaptor
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}
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seenPods := map[string]*podEntry{}
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add := func(addr string, ep endpointSliceEndpointAdaptor, port endpointSlicePortAdaptor) {
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a := addr
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if port.port() != nil {
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a = net.JoinHostPort(addr, strconv.FormatUint(uint64(*port.port()), 10))
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}
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target := model.LabelSet{
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model.AddressLabel: lv(a),
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}
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if port.name() != nil {
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target[endpointSlicePortNameLabel] = lv(*port.name())
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}
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if port.protocol() != nil {
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target[endpointSlicePortProtocolLabel] = lv(*port.protocol())
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}
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if port.port() != nil {
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target[endpointSlicePortLabel] = lv(strconv.FormatUint(uint64(*port.port()), 10))
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}
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if port.appProtocol() != nil {
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target[endpointSlicePortAppProtocol] = lv(*port.appProtocol())
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}
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if ep.conditions().ready() != nil {
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target[endpointSliceEndpointConditionsReadyLabel] = lv(strconv.FormatBool(*ep.conditions().ready()))
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}
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if ep.conditions().serving() != nil {
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target[endpointSliceEndpointConditionsServingLabel] = lv(strconv.FormatBool(*ep.conditions().serving()))
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}
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if ep.conditions().terminating() != nil {
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target[endpointSliceEndpointConditionsTerminatingLabel] = lv(strconv.FormatBool(*ep.conditions().terminating()))
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}
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if ep.hostname() != nil {
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target[endpointSliceEndpointHostnameLabel] = lv(*ep.hostname())
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}
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if ep.targetRef() != nil {
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target[model.LabelName(endpointSliceAddressTargetKindLabel)] = lv(ep.targetRef().Kind)
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target[model.LabelName(endpointSliceAddressTargetNameLabel)] = lv(ep.targetRef().Name)
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}
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if ep.nodename() != nil {
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target[endpointSliceEndpointNodenameLabel] = lv(*ep.nodename())
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}
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if ep.zone() != nil {
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target[model.LabelName(endpointSliceEndpointZoneLabel)] = lv(*ep.zone())
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}
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for k, v := range ep.topology() {
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ln := strutil.SanitizeLabelName(k)
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target[model.LabelName(endpointSliceEndpointTopologyLabelPrefix+ln)] = lv(v)
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target[model.LabelName(endpointSliceEndpointTopologyLabelPresentPrefix+ln)] = presentValue
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}
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if e.withNodeMetadata {
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if ep.targetRef() != nil && ep.targetRef().Kind == "Node" {
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target = addNodeLabels(target, e.nodeInf, e.logger, &ep.targetRef().Name)
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} else {
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target = addNodeLabels(target, e.nodeInf, e.logger, ep.nodename())
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}
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}
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pod := e.resolvePodRef(ep.targetRef())
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if pod == nil {
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// This target is not a Pod, so don't continue with Pod specific logic.
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tg.Targets = append(tg.Targets, target)
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return
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}
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s := namespacedName(pod.Namespace, pod.Name)
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sp, ok := seenPods[s]
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if !ok {
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sp = &podEntry{pod: pod}
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seenPods[s] = sp
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}
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// Attach standard pod labels.
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target = target.Merge(podLabels(pod))
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// Attach potential container port labels matching the endpoint port.
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containers := append(pod.Spec.Containers, pod.Spec.InitContainers...)
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for i, c := range containers {
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for _, cport := range c.Ports {
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if port.port() == nil {
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continue
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}
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if *port.port() == cport.ContainerPort {
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ports := strconv.FormatUint(uint64(*port.port()), 10)
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isInit := i >= len(pod.Spec.Containers)
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target[podContainerNameLabel] = lv(c.Name)
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target[podContainerImageLabel] = lv(c.Image)
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target[podContainerPortNameLabel] = lv(cport.Name)
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target[podContainerPortNumberLabel] = lv(ports)
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target[podContainerPortProtocolLabel] = lv(string(cport.Protocol))
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target[podContainerIsInit] = lv(strconv.FormatBool(isInit))
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break
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}
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}
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}
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// Add service port so we know that we have already generated a target
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// for it.
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sp.servicePorts = append(sp.servicePorts, port)
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tg.Targets = append(tg.Targets, target)
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}
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for _, ep := range eps.endpoints() {
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for _, port := range eps.ports() {
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for _, addr := range ep.addresses() {
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add(addr, ep, port)
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}
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}
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}
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// For all seen pods, check all container ports. If they were not covered
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// by one of the service endpoints, generate targets for them.
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for _, pe := range seenPods {
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// PodIP can be empty when a pod is starting or has been evicted.
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if len(pe.pod.Status.PodIP) == 0 {
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continue
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}
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containers := append(pe.pod.Spec.Containers, pe.pod.Spec.InitContainers...)
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for i, c := range containers {
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for _, cport := range c.Ports {
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hasSeenPort := func() bool {
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for _, eport := range pe.servicePorts {
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if eport.port() == nil {
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continue
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}
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if cport.ContainerPort == *eport.port() {
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return true
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}
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}
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return false
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}
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if hasSeenPort() {
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continue
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}
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a := net.JoinHostPort(pe.pod.Status.PodIP, strconv.FormatUint(uint64(cport.ContainerPort), 10))
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ports := strconv.FormatUint(uint64(cport.ContainerPort), 10)
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isInit := i >= len(pe.pod.Spec.Containers)
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target := model.LabelSet{
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model.AddressLabel: lv(a),
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podContainerNameLabel: lv(c.Name),
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podContainerImageLabel: lv(c.Image),
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podContainerPortNameLabel: lv(cport.Name),
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podContainerPortNumberLabel: lv(ports),
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podContainerPortProtocolLabel: lv(string(cport.Protocol)),
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podContainerIsInit: lv(strconv.FormatBool(isInit)),
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}
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tg.Targets = append(tg.Targets, target.Merge(podLabels(pe.pod)))
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}
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}
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}
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return tg
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}
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func (e *EndpointSlice) resolvePodRef(ref *apiv1.ObjectReference) *apiv1.Pod {
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if ref == nil || ref.Kind != "Pod" {
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return nil
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}
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obj, exists, err := e.podStore.GetByKey(namespacedName(ref.Namespace, ref.Name))
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if err != nil {
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e.logger.Error("resolving pod ref failed", "err", err)
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return nil
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}
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if !exists {
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return nil
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}
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return obj.(*apiv1.Pod)
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}
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func (e *EndpointSlice) addServiceLabels(esa endpointSliceAdaptor, tg *targetgroup.Group) {
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var (
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found bool
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name string
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)
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ns := esa.namespace()
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// Every EndpointSlice object has the Service they belong to in the
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// kubernetes.io/service-name label.
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name, found = esa.labels()[esa.labelServiceName()]
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if !found {
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return
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}
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obj, exists, err := e.serviceStore.GetByKey(namespacedName(ns, name))
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if err != nil {
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e.logger.Error("retrieving service failed", "err", err)
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return
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}
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if !exists {
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return
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}
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svc := obj.(*apiv1.Service)
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tg.Labels = tg.Labels.Merge(serviceLabels(svc))
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}
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