vendor/github.com/fsouza/go-dockerclient/external/github.com/Sirupsen/logrus/json_formatter.go

   1 package logrus
   2
   3 import (
   4         "encoding/json"
   5         "fmt"
   6 )
   7
   8 type JSONFormatter struct {
   9         // TimestampFormat sets the format used for marshaling timestamps.
  10         TimestampFormat string
  11 }
  12
  13 func (f *JSONFormatter) Format(entry *Entry) ([]byte, error) {
  14         data := make(Fields, len(entry.Data)+3)
  15         for k, v := range entry.Data {
  16                 switch v := v.(type) {
  17                 case error:
  18                         // Otherwise errors are ignored by `encoding/json`
  19                         // https://github.com/Sirupsen/logrus/issues/137
  20                         data[k] = v.Error()
  21                 default:
  22                         data[k] = v
  23                 }
  24         }
  25         prefixFieldClashes(data)
  26
  27         timestampFormat := f.TimestampFormat
  28         if timestampFormat == "" {
  29                 timestampFormat = DefaultTimestampFormat
  30         }
  31
  32         data["time"] = entry.Time.Format(timestampFormat)
  33         data["msg"] = entry.Message
  34         data["level"] = entry.Level.String()
  35
  36         serialized, err := json.Marshal(data)
  37         if err != nil {
  38                 return nil, fmt.Errorf("Failed to marshal fields to JSON, %v", err)
  39         }
  40         return append(serialized, '\n'), nil
  41 }