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drop_fields.go
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drop_fields.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 actions
import (
"encoding/json"
"fmt"
"github.com/pkg/errors"
"go.uber.org/multierr"
"github.com/elastic/beats/v7/libbeat/beat"
"github.com/elastic/beats/v7/libbeat/common"
"github.com/elastic/beats/v7/libbeat/processors"
"github.com/elastic/beats/v7/libbeat/processors/checks"
)
type dropFields struct {
Fields []string
IgnoreMissing bool
}
func init() {
processors.RegisterPlugin("drop_fields",
checks.ConfigChecked(newDropFields,
checks.RequireFields("fields"),
checks.AllowedFields("fields", "when", "ignore_missing")))
}
func newDropFields(c *common.Config) (processors.Processor, error) {
config := struct {
Fields []string `config:"fields"`
IgnoreMissing bool `config:"ignore_missing"`
}{}
err := c.Unpack(&config)
if err != nil {
return nil, fmt.Errorf("fail to unpack the drop_fields configuration: %s", err)
}
/* remove read only fields */
for _, readOnly := range processors.MandatoryExportedFields {
for i, field := range config.Fields {
if readOnly == field {
config.Fields = append(config.Fields[:i], config.Fields[i+1:]...)
}
}
}
f := &dropFields{Fields: config.Fields, IgnoreMissing: config.IgnoreMissing}
return f, nil
}
func (f *dropFields) Run(event *beat.Event) (*beat.Event, error) {
var errs []error
for _, field := range f.Fields {
if err := event.Delete(field); err != nil {
if f.IgnoreMissing && err == common.ErrKeyNotFound {
continue
}
errs = append(errs, errors.Wrapf(err, "failed to drop field [%v]", field))
}
}
return event, multierr.Combine(errs...)
}
func (f *dropFields) String() string {
json, _ := json.Marshal(f)
return "drop_fields=" + string(json)
}