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templatejson.go
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templatejson.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 (
"bytes"
"encoding/json"
"github.com/trivago/gollum/core"
"github.com/trivago/gollum/core/log"
"github.com/trivago/gollum/shared"
"text/template"
)
// TemplateJSON formatter plugin
// TemplateJSON is a formatter that evaluates a text template with an input
// of a JSON message.
// Configuration example
//
// - "stream.Broadcast":
// Formatter: "format.TemplateJSON"
// TemplateJSONFormatter: "format.Forward"
// TemplateJSONTemplate: ""
//
// TemplateJSONFormatter formatter that will be applied before
// the field is templated. Set to format.Forward by default.
//
// TemplateJSONTemplate defines the template to execute with text/template.
// This value is empty by default. If the template fails to execute the output
// of TemplateJSONFormatter is returned.
type TemplateJSON struct {
base core.Formatter
template *template.Template
}
func init() {
shared.TypeRegistry.Register(TemplateJSON{})
}
// Configure initializes this formatter with values from a plugin config.
func (format *TemplateJSON) Configure(conf core.PluginConfig) error {
plugin, err := core.NewPluginWithType(conf.GetString("TemplateJSONFormatter", "format.Forward"), conf)
if err != nil {
return err
}
format.base = plugin.(core.Formatter)
templ := conf.GetString("TemplateJSONTemplate", "")
format.template, err = template.New("TemplateJSON").Parse(templ)
if err != nil {
return err
}
return nil
}
// Format executes the template against the JSON payload of this message
func (format *TemplateJSON) Format(msg core.Message) ([]byte, core.MessageStreamID) {
data, streamID := format.base.Format(msg)
values := shared.NewMarshalMap()
err := json.Unmarshal(data, &values)
if err != nil {
Log.Warning.Print("TemplateJSON failed to unmarshal a message: ", err)
return data, streamID // ### return, malformed data ###
}
var templateData bytes.Buffer
err = format.template.Execute(&templateData, values)
if err != nil {
Log.Warning.Print("TemplateJSON failed to template a message: ", err)
return data, streamID // ### return, malformed data ###
}
return templateData.Bytes(), streamID
}