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serialize.go
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serialize.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 (
"encoding/base64"
"github.com/trivago/gollum/core"
"github.com/trivago/gollum/core/log"
"github.com/trivago/gollum/shared"
)
// Serialize formatter plugin
// Serialize is a formatter that serializes a message for later retrieval.
// Configuration example
//
// - "stream.Broadcast":
// Formatter: "format.Serialize"
// SerializeFormatter: "format.Envelope"
// SerializeStringEncode: true
//
// SerializeFormatter defines the formatter for the data transferred as
// message. By default this is set to "format.Forward"
//
// SerializeStringEncode causes the serialized data to be base64 encoded and
// newline separated. This is enabled by default.
type Serialize struct {
base core.Formatter
encode bool
}
func init() {
shared.TypeRegistry.Register(Serialize{})
}
// Configure initializes this formatter with values from a plugin config.
func (format *Serialize) Configure(conf core.PluginConfig) error {
plugin, err := core.NewPluginWithType(conf.GetString("SerializeFormatter", "format.Forward"), conf)
if err != nil {
return err
}
format.encode = conf.GetBool("SerializeStringEncode", true)
format.base = plugin.(core.Formatter)
return nil
}
// Format prepends the sequence number of the message (followed by ":") to the
// message.
func (format *Serialize) Format(msg core.Message) ([]byte, core.MessageStreamID) {
msg.Data, msg.StreamID = format.base.Format(msg)
data, err := msg.Serialize()
if err != nil {
Log.Error.Print("Serialize: ", err)
return msg.Data, msg.StreamID
}
if !format.encode {
return data, msg.StreamID // ### return, raw data ###
}
encodedSize := base64.StdEncoding.EncodedLen(len(data))
encoded := make([]byte, encodedSize+1)
base64.StdEncoding.Encode(encoded, data)
encoded[encodedSize] = '\n'
return encoded, msg.StreamID
}