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pod.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 metadata
import (
"context"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
k8s "k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
"github.com/elastic/elastic-agent-autodiscover/kubernetes"
"github.com/elastic/elastic-agent-libs/config"
"github.com/elastic/elastic-agent-libs/mapstr"
)
type pod struct {
store cache.Store
client k8s.Interface
node MetaGen
namespace MetaGen
resource *Resource
addResourceMetadata *AddResourceMetadataConfig
}
// NewPodMetadataGenerator creates a metagen for pod resources
func NewPodMetadataGenerator(
cfg *config.C,
pods cache.Store,
client k8s.Interface,
node MetaGen,
namespace MetaGen,
addResourceMetadata *AddResourceMetadataConfig) MetaGen {
return &pod{
resource: NewResourceMetadataGenerator(cfg, client),
store: pods,
node: node,
namespace: namespace,
client: client,
addResourceMetadata: addResourceMetadata,
}
}
// Generate generates pod metadata from a resource object
// Metadata map is in the following form:
// {
// "kubernetes": {},
// "some.ecs.field": "asdf"
// }
// All Kubernetes fields that need to be stored under kubernetes. prefix are populated by
// GenerateK8s method while fields that are part of ECS are generated by GenerateECS method
func (p *pod) Generate(obj kubernetes.Resource, opts ...FieldOptions) mapstr.M {
ecsFields := p.GenerateECS(obj)
meta := mapstr.M{
"kubernetes": p.GenerateK8s(obj, opts...),
}
meta.DeepUpdate(ecsFields)
return meta
}
// GenerateECS generates pod ECS metadata from a resource object
func (p *pod) GenerateECS(obj kubernetes.Resource) mapstr.M {
return p.resource.GenerateECS(obj)
}
// GenerateK8s generates pod metadata from a resource object
func (p *pod) GenerateK8s(obj kubernetes.Resource, opts ...FieldOptions) mapstr.M {
po, ok := obj.(*kubernetes.Pod)
if !ok {
return nil
}
out := p.resource.GenerateK8s("pod", obj, opts...)
// check if Pod is handled by a ReplicaSet which is controlled by a Deployment
// same happens with CronJob vs Job. The hierarchy there is CronJob->Job->Pod
if p.addResourceMetadata.Deployment {
rsName, _ := out.GetValue("replicaset.name")
if rsName, ok := rsName.(string); ok {
dep := p.getRSDeployment(rsName, po.GetNamespace())
if dep != "" {
_, _ = out.Put("deployment.name", dep)
}
}
}
// check if Pod is handled by a Job which is controlled by a CronJob
if p.addResourceMetadata.CronJob {
jobName, _ := out.GetValue("job.name")
if jobName, ok := jobName.(string); ok {
dep := p.getCronjobOfJob(jobName, po.GetNamespace())
if dep != "" {
_, _ = out.Put("cronjob.name", dep)
}
}
}
if p.node != nil {
meta := p.node.GenerateFromName(po.Spec.NodeName, WithMetadata("node"))
if meta != nil {
_, _ = out.Put("node", meta["node"])
} else {
_, _ = out.Put("node.name", po.Spec.NodeName)
}
} else {
_, _ = out.Put("node.name", po.Spec.NodeName)
}
if p.namespace != nil {
meta := p.namespace.GenerateFromName(po.GetNamespace())
if meta != nil {
out.DeepUpdate(meta)
}
}
if po.Status.PodIP != "" {
_, _ = out.Put("pod.ip", po.Status.PodIP)
}
return out
}
// GenerateFromName generates pod metadata from a pod name
func (p *pod) GenerateFromName(name string, opts ...FieldOptions) mapstr.M {
if p.store == nil {
return nil
}
if obj, ok, _ := p.store.GetByKey(name); ok {
po, ok := obj.(*kubernetes.Pod)
if !ok {
return nil
}
return p.GenerateK8s(po, opts...)
}
return nil
}
// getRSDeployment return the name of the Deployment object that
// owns the ReplicaSet with the given name under the given Namespace
func (p *pod) getRSDeployment(rsName string, ns string) string {
if p.client == nil {
return ""
}
rs, err := p.client.AppsV1().ReplicaSets(ns).Get(context.TODO(), rsName, metav1.GetOptions{})
if err != nil {
return ""
}
for _, ref := range rs.GetOwnerReferences() {
if ref.Controller != nil && *ref.Controller {
switch ref.Kind {
case "Deployment":
return ref.Name
}
}
}
return ""
}
// getCronjobOfJob return the name of the Cronjob object that
// owns the Job with the given name under the given Namespace
func (p *pod) getCronjobOfJob(jobName string, ns string) string {
if p.client == nil {
return ""
}
cronjob, err := p.client.BatchV1().Jobs(ns).Get(context.TODO(), jobName, metav1.GetOptions{})
if err != nil {
return ""
}
for _, ref := range cronjob.GetOwnerReferences() {
if ref.Controller != nil && *ref.Controller {
switch ref.Kind {
case "CronJob":
return ref.Name
}
}
}
return ""
}