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add_docker_metadata.go
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/
add_docker_metadata.go
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package add_docker_metadata
import (
"fmt"
"strings"
"github.com/elastic/beats/libbeat/beat"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/common/cfgwarn"
"github.com/elastic/beats/libbeat/common/docker"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/libbeat/processors"
"github.com/elastic/beats/libbeat/processors/actions"
)
func init() {
processors.RegisterPlugin("add_docker_metadata", newDockerMetadataProcessor)
}
type addDockerMetadata struct {
watcher docker.Watcher
fields []string
sourceProcessor processors.Processor
}
func newDockerMetadataProcessor(cfg *common.Config) (processors.Processor, error) {
return buildDockerMetadataProcessor(cfg, docker.NewWatcher)
}
func buildDockerMetadataProcessor(cfg *common.Config, watcherConstructor docker.WatcherConstructor) (processors.Processor, error) {
cfgwarn.Beta("The add_docker_metadata processor is beta")
config := defaultConfig()
err := cfg.Unpack(&config)
if err != nil {
return nil, fmt.Errorf("fail to unpack the add_docker_metadata configuration: %s", err)
}
watcher, err := watcherConstructor(config.Host, config.TLS)
if err != nil {
return nil, err
}
if err = watcher.Start(); err != nil {
return nil, err
}
// Use extract_field processor to get container id from source file path
var sourceProcessor processors.Processor
if config.MatchSource {
var procConf, _ = common.NewConfigFrom(map[string]interface{}{
"field": "source",
"separator": "/",
"index": config.SourceIndex,
"target": "docker.container.id",
})
sourceProcessor, err = actions.NewExtractField(procConf)
if err != nil {
return nil, err
}
// Ensure `docker.container.id` is matched:
config.Fields = append(config.Fields, "docker.container.id")
}
return &addDockerMetadata{
watcher: watcher,
fields: config.Fields,
sourceProcessor: sourceProcessor,
}, nil
}
func (d *addDockerMetadata) Run(event *beat.Event) (*beat.Event, error) {
var cid string
var err error
// Process source field
if d.sourceProcessor != nil {
if event.Fields["source"] != nil {
event, err = d.sourceProcessor.Run(event)
if err != nil {
logp.Debug("docker", "Error while extracting container ID from source path: %v", err)
return event, nil
}
}
}
for _, field := range d.fields {
value, err := event.GetValue(field)
if err != nil {
continue
}
if strValue, ok := value.(string); ok {
cid = strValue
}
}
if cid == "" {
return event, nil
}
container := d.watcher.Container(cid)
if container != nil {
meta := common.MapStr{}
metaIface, ok := event.Fields["docker"]
if ok {
meta = metaIface.(common.MapStr)
}
if len(container.Labels) > 0 {
labels := common.MapStr{}
for k, v := range container.Labels {
labels.Put(k, v)
}
meta.Put("container.labels", labels)
}
meta.Put("container.id", container.ID)
meta.Put("container.image", container.Image)
meta.Put("container.name", container.Name)
event.Fields["docker"] = meta
} else {
logp.Debug("docker", "Container not found: %s", cid)
}
return event, nil
}
func (d *addDockerMetadata) String() string {
return "add_docker_metadata=[fields=" + strings.Join(d.fields, ", ") + "]"
}