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process.go
47 lines (39 loc) · 1.37 KB
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process.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 lowercase
import (
"errors"
"strings"
"github.com/andrewkroh/go-sawmill/pkg/event"
"github.com/andrewkroh/go-sawmill/pkg/processor"
)
func (p *Lowercase) Process(evt processor.Event) error {
v := evt.Get(p.config.Field)
if v == nil {
return processor.ErrorKeyMissing{Key: p.config.Field}
}
if v.Type != event.StringType {
return errors.New("value to lowercase is not a string")
}
out := strings.ToLower(v.String)
targetField := p.config.Field
if p.config.TargetField != "" {
targetField = p.config.TargetField
}
_, err := evt.Put(targetField, event.String(out))
return err
}