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Cherry-pick #17342 to 7.x: LIBBEAT: Enhancement replace_string proces…
…sor for replacing strings values of fields. (#18047)
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Steffen Siering
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Apr 29, 2020
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[[replace-fields]] | ||
=== Replace fields from events | ||
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++++ | ||
<titleabbrev>replace</titleabbrev> | ||
++++ | ||
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The `replace` processor takes a list of fields to replace the field value | ||
matching a pattern with replacement string. Under the `fields` key, each entry | ||
contains a `field: field-name`, `pattern: regex-pattern` and | ||
`replacement: replacement-string`, where: | ||
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* `field` is the original field name | ||
* `pattern` is regex pattern to match field's value | ||
* `replacement` is the replacement string to use for updating the field's value | ||
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The `replace` processor cannot be used to replace value with a completely new value. | ||
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TIP: You can replace field value to truncate part of field value or replace | ||
it with a new string. It can also be used for masking PII information. | ||
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Following example will change path from /usr/bin to /usr/local/bin | ||
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[source,yaml] | ||
------- | ||
processors: | ||
- replace: | ||
fields: | ||
- field: "file.path" | ||
pattern: "/usr/" | ||
replacement: "/usr/local/" | ||
ignore_missing: false | ||
fail_on_error: true | ||
------- | ||
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The `replace` processor has following configuration settings: | ||
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`ignore_missing`:: (Optional) If set to true, no error is logged in case a specifiedfield | ||
is missing. Default is `false`. | ||
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`fail_on_error`:: (Optional) If set to true, in case of an error the replacement of | ||
field values is stopped and the original event is returned. If set to false, replacement | ||
continues even if an error occurs during replacement. Default is `true`. | ||
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See <<conditions>> for a list of supported conditions. | ||
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You can specify multiple `ignore_missing` processors under the `processors` | ||
section. | ||
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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. | ||
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package actions | ||
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import ( | ||
"fmt" | ||
"regexp" | ||
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"github.com/pkg/errors" | ||
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"github.com/elastic/beats/v7/libbeat/beat" | ||
"github.com/elastic/beats/v7/libbeat/common" | ||
"github.com/elastic/beats/v7/libbeat/logp" | ||
"github.com/elastic/beats/v7/libbeat/processors" | ||
"github.com/elastic/beats/v7/libbeat/processors/checks" | ||
jsprocessor "github.com/elastic/beats/v7/libbeat/processors/script/javascript/module/processor" | ||
) | ||
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type replaceString struct { | ||
config replaceStringConfig | ||
} | ||
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type replaceStringConfig struct { | ||
Fields []replaceConfig `config:"fields"` | ||
IgnoreMissing bool `config:"ignore_missing"` | ||
FailOnError bool `config:"fail_on_error"` | ||
} | ||
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type replaceConfig struct { | ||
Field string `config:"field"` | ||
Pattern *regexp.Regexp `config:"pattern"` | ||
Replacement string `config:"replacement"` | ||
} | ||
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func init() { | ||
processors.RegisterPlugin("replace", | ||
checks.ConfigChecked(NewReplaceString, | ||
checks.RequireFields("fields"))) | ||
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jsprocessor.RegisterPlugin("Replace", NewReplaceString) | ||
} | ||
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// NewReplaceString returns a new replace processor. | ||
func NewReplaceString(c *common.Config) (processors.Processor, error) { | ||
config := replaceStringConfig{ | ||
IgnoreMissing: false, | ||
FailOnError: true, | ||
} | ||
err := c.Unpack(&config) | ||
if err != nil { | ||
return nil, fmt.Errorf("failed to unpack the replace configuration: %s", err) | ||
} | ||
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f := &replaceString{ | ||
config: config, | ||
} | ||
return f, nil | ||
} | ||
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func (f *replaceString) Run(event *beat.Event) (*beat.Event, error) { | ||
var backup common.MapStr | ||
// Creates a copy of the event to revert in case of failure | ||
if f.config.FailOnError { | ||
backup = event.Fields.Clone() | ||
} | ||
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for _, field := range f.config.Fields { | ||
err := f.replaceField(field.Field, field.Pattern, field.Replacement, event.Fields) | ||
if err != nil { | ||
errMsg := fmt.Errorf("Failed to replace fields in processor: %s", err) | ||
logp.Debug("replace", errMsg.Error()) | ||
if f.config.FailOnError { | ||
event.Fields = backup | ||
event.PutValue("error.message", errMsg.Error()) | ||
return event, err | ||
} | ||
} | ||
} | ||
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return event, nil | ||
} | ||
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func (f *replaceString) replaceField(field string, pattern *regexp.Regexp, replacement string, fields common.MapStr) error { | ||
currentValue, err := fields.GetValue(field) | ||
if err != nil { | ||
// Ignore ErrKeyNotFound errors | ||
if f.config.IgnoreMissing && errors.Cause(err) == common.ErrKeyNotFound { | ||
return nil | ||
} | ||
return fmt.Errorf("could not fetch value for key: %s, Error: %s", field, err) | ||
} | ||
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updatedString := pattern.ReplaceAllString(currentValue.(string), replacement) | ||
_, err = fields.Put(field, updatedString) | ||
if err != nil { | ||
return fmt.Errorf("could not put value: %s: %v, %v", replacement, currentValue, err) | ||
} | ||
return nil | ||
} | ||
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func (f *replaceString) String() string { | ||
return "replace=" + fmt.Sprintf("%+v", f.config.Fields) | ||
} |
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