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include_fields.go
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/
include_fields.go
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package actions
import (
"fmt"
"strings"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/processors"
"github.com/pkg/errors"
)
type includeFields struct {
Fields []string
}
func init() {
processors.RegisterPlugin("include_fields",
configChecked(newIncludeFields,
requireFields("fields"),
allowedFields("fields", "when")))
}
func newIncludeFields(c common.Config) (processors.Processor, error) {
config := struct {
Fields []string `config:"fields"`
}{}
err := c.Unpack(&config)
if err != nil {
return nil, fmt.Errorf("fail to unpack the include_fields configuration: %s", err)
}
/* add read only fields if they are not yet */
for _, readOnly := range processors.MandatoryExportedFields {
found := false
for _, field := range config.Fields {
if readOnly == field {
found = true
}
}
if !found {
config.Fields = append(config.Fields, readOnly)
}
}
f := includeFields{Fields: config.Fields}
return &f, nil
}
func (f includeFields) Run(event common.MapStr) (common.MapStr, error) {
filtered := common.MapStr{}
var errs []string
for _, field := range f.Fields {
err := event.CopyFieldsTo(filtered, field)
// Ignore errors caused by a field not existing in the event.
if err != nil && errors.Cause(err) != common.ErrKeyNotFound {
errs = append(errs, err.Error())
}
}
if len(errs) > 0 {
return filtered, fmt.Errorf(strings.Join(errs, ", "))
}
return filtered, nil
}
func (f includeFields) String() string {
return "include_fields=" + strings.Join(f.Fields, ", ")
}