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double.go
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double.go
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// Copyright 2015 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 (
"github.com/trivago/gollum/core"
)
// Double formatter plugin
//
// Double is a formatter that appends a delimiter string and a second copy of
// the message's contents to the message. Independent sets of formatters may
// be applied to both duplicates.
//
// Parameters
//
// - Separator: This value sets the separator string placed between both parts.
// This parameter is set to ":" by default.
//
// - UseLeftStreamID: Use the stream id of the left side as the final stream id
// for the message if this value is "true".
// This parameter is set to "false" by default.
//
// - Left: An optional list of formatters. The first copy of the message (left
// of the delimiter) is passed through these filters.
// This parameter is set to an empty list by default.
//
// - Left: An optional list of formatters. The second copy of the mssage (right
// of the delimiter) is passed through these filters.
// This parameter is set to an empty list by default.
//
// Examples
//
// This example creates a message of the form "<orig>|<base64>", where <orig> is
// the original console input and <base64> its Base64-encoded equivalent.
//
// exampleConsumer:
// Type: consumer.Console
// Streams: "*"
// Modulators:
// - format.Double:
// Separator: "|"
// Right:
// - format.Base64Encode
type Double struct {
core.SimpleFormatter `gollumdoc:"embed_type"`
separator []byte `config:"Separator" default:":"`
leftStreamID bool `config:"UseLeftStreamID" default:"false"`
left core.FormatterArray `config:"Left"`
right core.FormatterArray `config:"Right"`
applyTo string
}
func init() {
core.TypeRegistry.Register(Double{})
}
// Configure initializes this formatter with values from a plugin config.
func (format *Double) Configure(conf core.PluginConfigReader) {
format.applyTo = conf.GetString("ApplyTo", "")
}
// ApplyFormatter update message payload
func (format *Double) ApplyFormatter(msg *core.Message) error {
leftMsg := msg.Clone()
rightMsg := msg.Clone()
// pre-process
if format.applyTo != "" {
leftMsg.StorePayload(format.GetAppliedContent(msg))
rightMsg.StorePayload(format.GetAppliedContent(msg))
}
// apply sub-formatter
if err := format.left.ApplyFormatter(leftMsg); err != nil {
return err
}
if err := format.right.ApplyFormatter(rightMsg); err != nil {
return err
}
// update content
format.SetAppliedContent(msg, format.getCombinedContent(leftMsg.GetPayload(), rightMsg.GetPayload()))
// handle streamID
if format.leftStreamID {
msg.SetStreamID(leftMsg.GetStreamID())
} else {
msg.SetStreamID(rightMsg.GetStreamID())
}
// fin
return nil
}
func (format *Double) getCombinedContent(leftContent []byte, rightContent []byte) []byte {
size := len(leftContent) + len(format.separator) + len(rightContent)
content := make([]byte, 0, size)
content = append(content, leftContent...)
content = append(content, format.separator...)
content = append(content, rightContent...)
return content
}