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/*
Using https://github.com/t-tomalak/logrus-easy-formatter/ as formatter
*/
package logger
import (
"strings"
"time"
"github.com/sirupsen/logrus"
)
const (
// Default log format will output [INFO]: 2006-01-02T15:04:05Z07:00 - Log message
defaultLogFormat = "[%lvl%]: %time% - %msg%"
defaultTimestampFormat = time.RFC3339
)
// Formatter implements logrus.Formatter interface.
type Formatter struct {
// Timestamp format
TimestampFormat string
// Available standard keys: time, msg, lvl
// Also can include custom fields but limited to strings.
// All of fields need to be wrapped inside %% i.e %time% %msg%
LogFormat string
// Disables the truncation of the level text to 4 characters.
DisableLevelTruncation bool
}
// Format building log message.
func (f *Formatter) Format(entry *logrus.Entry) ([]byte, error) {
output := f.LogFormat
if output == "" {
output = defaultLogFormat
}
timestampFormat := f.TimestampFormat
if timestampFormat == "" {
timestampFormat = defaultTimestampFormat
}
output = strings.Replace(output, "%time%", entry.Time.Format(timestampFormat), 1)
output = strings.Replace(output, "%msg%", entry.Message, 1)
level := strings.ToUpper(entry.Level.String())
if !f.DisableLevelTruncation {
level = level[:4]
}
output = strings.Replace(output, "%lvl%", level, 1)
for k, v := range entry.Data {
if s, ok := v.(string); ok {
output = strings.Replace(output, "%"+k+"%", s, 1)
}
}
output += "\n"
return []byte(output), nil
}