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kubernetes.go
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kubernetes.go
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package add_kubernetes_metadata
import (
"errors"
"fmt"
"sync"
"time"
"github.com/elastic/beats/libbeat/beat"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/common/bus"
"github.com/elastic/beats/libbeat/common/kubernetes"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/libbeat/processors"
)
const (
timeout = time.Second * 5
)
var (
fatalError = errors.New("Unable to create kubernetes processor")
)
type kubernetesAnnotator struct {
sync.RWMutex
watcher kubernetes.Watcher
startListener bus.Listener
stopListener bus.Listener
updateListener bus.Listener
indexers *Indexers
matchers *Matchers
metadata map[string]common.MapStr
}
func init() {
processors.RegisterPlugin("add_kubernetes_metadata", newKubernetesAnnotator)
// Register default indexers
Indexing.AddIndexer(PodNameIndexerName, NewPodNameIndexer)
Indexing.AddIndexer(ContainerIndexerName, NewContainerIndexer)
Indexing.AddIndexer(IPPortIndexerName, NewIPPortIndexer)
Indexing.AddMatcher(FieldMatcherName, NewFieldMatcher)
Indexing.AddMatcher(FieldFormatMatcherName, NewFieldFormatMatcher)
}
func newKubernetesAnnotator(cfg *common.Config) (processors.Processor, error) {
config := defaultKubernetesAnnotatorConfig()
err := cfg.Unpack(&config)
if err != nil {
return nil, fmt.Errorf("fail to unpack the kubernetes configuration: %s", err)
}
err = validate(config)
if err != nil {
return nil, err
}
//Load default indexer configs
if config.DefaultIndexers.Enabled == true {
Indexing.RLock()
for key, cfg := range Indexing.GetDefaultIndexerConfigs() {
config.Indexers = append(config.Indexers, map[string]common.Config{key: cfg})
}
Indexing.RUnlock()
}
//Load default matcher configs
if config.DefaultMatchers.Enabled == true {
Indexing.RLock()
for key, cfg := range Indexing.GetDefaultMatcherConfigs() {
config.Matchers = append(config.Matchers, map[string]common.Config{key: cfg})
}
Indexing.RUnlock()
}
metaGen := kubernetes.NewMetaGenerator(config.IncludeAnnotations, config.IncludeLabels, config.ExcludeLabels)
indexers := NewIndexers(config.Indexers, metaGen)
matchers := NewMatchers(config.Matchers)
if matchers.Empty() {
return nil, fmt.Errorf("Can not initialize kubernetes plugin with zero matcher plugins")
}
client, err := kubernetes.GetKubernetesClient(config.InCluster, config.KubeConfig)
if err != nil {
return nil, err
}
config.Host = kubernetes.DiscoverKubernetesNode(config.Host, client)
logp.Debug("kubernetes", "Using host ", config.Host)
logp.Debug("kubernetes", "Initializing watcher")
if client != nil {
watcher := kubernetes.NewWatcher(client.CoreV1(), config.SyncPeriod, config.CleanupTimeout, config.Host)
start := watcher.ListenStart()
stop := watcher.ListenStop()
update := watcher.ListenUpdate()
processor := &kubernetesAnnotator{
watcher: watcher,
indexers: indexers,
matchers: matchers,
metadata: make(map[string]common.MapStr, 0),
startListener: start,
stopListener: stop,
updateListener: update,
}
// Start worker
go processor.worker()
if err := watcher.Start(); err != nil {
return nil, err
}
return processor, nil
}
return nil, fatalError
}
func (k *kubernetesAnnotator) Run(event *beat.Event) (*beat.Event, error) {
index := k.matchers.MetadataIndex(event.Fields)
if index == "" {
return event, nil
}
k.RLock()
metadata := k.metadata[index]
k.RUnlock()
if metadata == nil {
return event, nil
}
meta := common.MapStr{}
metaIface, ok := event.Fields["kubernetes"]
if !ok {
event.Fields["kubernetes"] = common.MapStr{}
} else {
meta = metaIface.(common.MapStr)
}
meta.Update(metadata)
event.Fields["kubernetes"] = meta
return event, nil
}
// worker watches pod events and keeps a map of metadata
func (k *kubernetesAnnotator) worker() {
for {
select {
case event := <-k.startListener.Events():
processEvent(k.addPod, event)
case event := <-k.stopListener.Events():
processEvent(k.removePod, event)
case event := <-k.updateListener.Events():
processEvent(k.removePod, event)
processEvent(k.addPod, event)
}
}
}
// Run pod actions while handling errors
func processEvent(f func(pod *kubernetes.Pod), event bus.Event) {
pod, ok := event["pod"].(*kubernetes.Pod)
if !ok {
logp.Err("Couldn't get a pod from watcher event")
return
}
f(pod)
}
func (k *kubernetesAnnotator) addPod(pod *kubernetes.Pod) {
metadata := k.indexers.GetMetadata(pod)
k.Lock()
defer k.Unlock()
for _, m := range metadata {
k.metadata[m.Index] = m.Data
}
}
func (k *kubernetesAnnotator) removePod(pod *kubernetes.Pod) {
indexes := k.indexers.GetIndexes(pod)
k.Lock()
defer k.Unlock()
for _, idx := range indexes {
delete(k.metadata, idx)
}
}
func (*kubernetesAnnotator) String() string {
return "add_kubernetes_metadata"
}
func validate(config kubeAnnotatorConfig) error {
if !config.InCluster && config.KubeConfig == "" {
return errors.New("`kube_config` path can't be empty when in_cluster is set to false")
}
return nil
}