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extract_field.go
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extract_field.go
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package actions
import (
"fmt"
"strings"
"github.com/elastic/beats/libbeat/beat"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/processors"
)
type extract_field struct {
Field string
Separator string
Index int
Target string
}
/*
This one won't be registered (yet)
func init() {
processors.RegisterPlugin("extract_field",
configChecked(NewExtractField,
requireFields("field", "separator", "index", "target"),
allowedFields("field", "separator", "index", "target", "when")))
}
*/
func NewExtractField(c *common.Config) (processors.Processor, error) {
config := struct {
Field string `config:"field"`
Separator string `config:"separator"`
Index int `config:"index"`
Target string `config:"target"`
}{}
err := c.Unpack(&config)
if err != nil {
return nil, fmt.Errorf("fail to unpack the extract_field configuration: %s", err)
}
/* remove read only fields */
for _, readOnly := range processors.MandatoryExportedFields {
if config.Field == readOnly {
return nil, fmt.Errorf("%s is a read only field, cannot override", readOnly)
}
}
f := &extract_field{
Field: config.Field,
Separator: config.Separator,
Index: config.Index,
Target: config.Target,
}
return f, nil
}
func (f *extract_field) Run(event *beat.Event) (*beat.Event, error) {
fieldValue, err := event.GetValue(f.Field)
if err != nil {
return nil, fmt.Errorf("error getting field '%s' from event", f.Field)
}
value, ok := fieldValue.(string)
if !ok {
return nil, fmt.Errorf("could not get a string from field '%s'", f.Field)
}
parts := strings.Split(value, f.Separator)
parts = deleteEmpty(parts)
if len(parts) < f.Index+1 {
return nil, fmt.Errorf("index is out of range for field '%s'", f.Field)
}
event.PutValue(f.Target, parts[f.Index])
return event, nil
}
func (f extract_field) String() string {
return "extract_field=" + f.Target
}
func deleteEmpty(s []string) []string {
var r []string
for _, str := range s {
if str != "" {
r = append(r, str)
}
}
return r
}