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runlength.go
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runlength.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 (
"github.com/trivago/gollum/core"
"github.com/trivago/gollum/shared"
"strconv"
)
// Runlength formatter plugin
// Runlength is a formatter that prepends the length of the message, followed by
// a ":". The actual message is formatted by a nested formatter.
// Configuration example
//
// - "stream.Broadcast":
// Formatter: "format.Runlength"
// RunlengthSeparator: ":"
// RunlengthFormatter: "format.Envelope"
//
// RunlengthSeparator sets the separator character placed after the runlength.
// This is set to ":" by default.
//
// RunlengthDataFormatter defines the formatter for the data transferred as
// message. By default this is set to "format.Forward"
type Runlength struct {
base core.Formatter
separator string
}
func init() {
shared.TypeRegistry.Register(Runlength{})
}
// Configure initializes this formatter with values from a plugin config.
func (format *Runlength) Configure(conf core.PluginConfig) error {
plugin, err := core.NewPluginWithType(conf.GetString("RunlengthFormatter", "format.Forward"), conf)
if err != nil {
return err
}
format.separator = conf.GetString("RunlengthSeparator", ":")
format.base = plugin.(core.Formatter)
return nil
}
// Format prepends the length of the message (followed by ":") to the message.
func (format *Runlength) Format(msg core.Message) ([]byte, core.MessageStreamID) {
basePayload, stream := format.base.Format(msg)
baseLength := len(basePayload)
lengthStr := strconv.Itoa(baseLength) + format.separator
payload := make([]byte, len(lengthStr)+baseLength)
len := copy(payload, []byte(lengthStr))
copy(payload[len:], basePayload)
return payload, stream
}