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sequence.go
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sequence.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"
"strconv"
"sync/atomic"
)
// Sequence formatter
//
// This formatter prefixes data with a sequence number managed by the
// formatter. All messages passing through an instance of the
// formatter will get a unique number. The number is not persisted,
// i.e. it restarts at 0 after each restart of gollum.
//
// Parameters
//
// - Separator: Defines the separator string placed between number and data.
// By default this parameter is set to ":".
//
// Examples
//
// This example will insert the sequence number into an existing JSON payload.
//
// exampleProducer:
// Type: producer.Console
// Streams: "*"
// Modulators:
// - format.Trim:
// LeftSeparator: "{"
// RightSeparator: "}"
// - format.Sequence
// Separator: ","
// - format.Envelope:
// Prefix: "{\"seq\":"
// Postfix: "}"
type Sequence struct {
core.SimpleFormatter `gollumdoc:"embed_type"`
separator []byte `config:"Separator" default:":"`
seq *int64
}
func init() {
core.TypeRegistry.Register(Sequence{})
}
// Configure initializes this formatter with values from a plugin config.
func (format *Sequence) Configure(conf core.PluginConfigReader) {
format.seq = new(int64)
}
// ApplyFormatter update message payload
func (format *Sequence) ApplyFormatter(msg *core.Message) error {
seq := atomic.AddInt64(format.seq, 1)
sequenceStr := strconv.FormatInt(seq, 10)
content := format.GetAppliedContent(msg)
dataSize := len(sequenceStr) + len(format.separator) + len(content)
payload := core.MessageDataPool.Get(dataSize)
offset := copy(payload, []byte(sequenceStr))
offset += copy(payload[offset:], format.separator)
copy(payload[offset:], content)
format.SetAppliedContent(msg, payload)
return nil
}