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hostname.go
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hostname.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"
"os"
)
// Hostname formatter
//
// This formatter prefixes the message or metadata with the hostname of
// the machine gollum is running on.
//
// Parameters
//
// - Separator: Defines the separator string placed between hostname and data.
// By default this parameter is set to ":".
//
// Examples
//
// This example inserts the hostname into an existing JSON payload.
//
// exampleProducer:
// Type: producer.Console
// Streams: "*"
// Modulators:
// - format.Trim:
// LeftSeparator: "{"
// RightSeparator: "}"
// - format.Hostname
// Separator: ","
// - format.Envelope:
// Prefix: "{\"host\":"
// Postfix: "}"
type Hostname struct {
core.SimpleFormatter `gollumdoc:"embed_type"`
separator []byte `config:"Separator" default:":"`
}
func init() {
core.TypeRegistry.Register(Hostname{})
}
// Configure initializes this formatter with values from a plugin config.
func (format *Hostname) Configure(conf core.PluginConfigReader) {
}
// ApplyFormatter update message payload
func (format *Hostname) ApplyFormatter(msg *core.Message) error {
content := format.getFinalContent(format.GetAppliedContent(msg))
format.SetAppliedContent(msg, content)
return nil
}
func (format *Hostname) getFinalContent(content []byte) []byte {
hostname, err := os.Hostname()
if err != nil {
format.Logger.Error(err)
hostname = "unknown host"
}
dataSize := len(hostname) + len(format.separator) + len(content)
payload := core.MessageDataPool.Get(dataSize)
offset := copy(payload, []byte(hostname))
offset += copy(payload[offset:], format.separator)
copy(payload[offset:], content)
return payload
}