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pod.go
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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 (
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
replicaset MetaGen
job 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,
replicaset MetaGen,
job MetaGen,
addResourceMetadata *AddResourceMetadataConfig) MetaGen {
return &pod{
resource: NewNamespaceAwareResourceMetadataGenerator(cfg, client, namespace),
store: pods,
node: node,
replicaset: replicaset,
job: job,
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.
// The hierarchy there is Deployment->ReplicaSet->Pod.
if p.addResourceMetadata.Deployment {
if p.replicaset != nil {
rsName, _ := out.GetValue("replicaset.name")
if rsName, ok := rsName.(string); ok {
meta := p.replicaset.GenerateFromName(po.Namespace + "/" + rsName)
deploymentName, _ := meta.GetValue("deployment.name")
if deploymentName != "" {
_, _ = out.Put("deployment.name", deploymentName)
}
}
}
}
// check if Pod is handled by a Job which is controlled by a CronJob.
// The hierarchy there is CronJob->Job->Pod
if p.addResourceMetadata.CronJob {
if p.job != nil {
jobName, _ := out.GetValue("job.name")
if jobName, ok := jobName.(string); ok {
meta := p.job.GenerateFromName(po.Namespace + "/" + jobName)
cronjobName, _ := meta.GetValue("cronjob.name")
if cronjobName != "" {
_, _ = out.Put("cronjob.name", cronjobName)
}
}
}
}
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 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
}