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splittojson.go
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splittojson.go
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// Copyright 2015-2017 trivago GmbH
//
// Licensed 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 format
import (
"bytes"
"fmt"
"github.com/trivago/gollum/core"
"github.com/trivago/tgo/tmath"
"github.com/trivago/tgo/tstrings"
)
// SplitToJSON formatter plugin
//
// SplitToJSON is a formatter that splits a message by a given token and creates
// a JSON object of the split values by assigning each value to a predefined property.
//
// Parameters
//
// - Keys: This value defines an array of JSON keys to which the split message's parts
// should be assigned to. The keys are applied to the resulting token array by index.
//
// - SplitBy: This value defines the separator character to use when splitting a message.
// By default this parameter is set to "|".
//
// - KeepJSON: This value can be set to "false" to escape JSON payload texts
// as regualar strings. Otherwise JSON payload will be taken as-is and set to the
// corresponding key.
// By default this parameter is set to "true".
//
// Examples
//
// This example will format a input of `value1,value2,value3` to a json
// string of `{"foo":"value1", "bar":"value2"}`:
//
// exampleConsumer:
// Type: consumer.Console
// Streams: "*"
// Modulators:
// - format.SplitToJSON:
// SplitBy: ","
// Keys:
// - foo
// - bar
type SplitToJSON struct {
core.SimpleFormatter `gollumdoc:"embed_type"`
token []byte `config:"SplitBy" default:"|"`
keys []string `config:"Keys"`
keepJSON bool `config:"KeepJSON" default:"true"`
}
func init() {
core.TypeRegistry.Register(SplitToJSON{})
}
// Configure initializes this formatter with values from a plugin config.
func (format *SplitToJSON) Configure(conf core.PluginConfigReader) {
}
// ApplyFormatter update message payload
func (format *SplitToJSON) ApplyFormatter(msg *core.Message) error {
components := bytes.Split(format.GetAppliedContent(msg), format.token)
maxIdx := tmath.MinI(len(format.keys), len(components))
jsonData := ""
switch {
case maxIdx == 0:
case maxIdx == 1:
jsonData = fmt.Sprintf("{%s:\"%s\"}", format.keys[0], components[0])
default:
for i := 0; i < maxIdx; i++ {
key := tstrings.EscapeJSON(format.keys[i])
value := string(components[i])
if isJSON, _, _ := tstrings.IsJSON(components[i]); !format.keepJSON || !isJSON {
value = "\"" + tstrings.EscapeJSON(value) + "\""
}
switch {
case i == 0:
jsonData = fmt.Sprintf("{\"%s\":%s", key, value)
case i == maxIdx-1:
jsonData = fmt.Sprintf("%s,\"%s\":%s}", jsonData, key, value)
default:
jsonData = fmt.Sprintf("%s,\"%s\":%s", jsonData, key, value)
}
}
}
format.SetAppliedContent(msg, []byte(jsonData))
return nil
}