formatter.go

package logrus

import (
	logr "github.com/sirupsen/logrus"
	"time"
)

// Default key names for the default fields
const (
	defaultTimestampFormat = time.RFC3339
	FieldKeyMsg            = "msg"
	FieldKeyLevel          = "level"
	FieldKeyTime           = "time"
	FieldKeyLogrusError    = "logrus_error"
	FieldKeyFunc           = "func"
	FieldKeyFile           = "file"
)

// This is to not silently overwrite `time`, `msg`, `func` and `level` fields when
// dumping it. If this code wasn't there doing:
//
//  logrus.WithField("level", 1).Info("hello")
//
// Would just silently drop the user provided level. Instead with this code
// it'll logged as:
//
//  {"level": "info", "fields.level": 1, "msg": "hello", "time": "..."}
//
// It's not exported because it's still using Data in an opinionated way. It's to
// avoid code duplication between the two default formatters.
func prefixFieldClashes(data logr.Fields, fieldMap FieldMap, reportCaller bool) {
	timeKey := fieldMap.resolve(FieldKeyTime)
	if t, ok := data[timeKey]; ok {
		data["fields."+timeKey] = t
		delete(data, timeKey)
	}

	msgKey := fieldMap.resolve(FieldKeyMsg)
	if m, ok := data[msgKey]; ok {
		data["fields."+msgKey] = m
		delete(data, msgKey)
	}

	levelKey := fieldMap.resolve(FieldKeyLevel)
	if l, ok := data[levelKey]; ok {
		data["fields."+levelKey] = l
		delete(data, levelKey)
	}

	logrusErrKey := fieldMap.resolve(FieldKeyLogrusError)
	if l, ok := data[logrusErrKey]; ok {
		data["fields."+logrusErrKey] = l
		delete(data, logrusErrKey)
	}

	// If reportCaller is not set, 'func' will not conflict.
	if reportCaller {
		funcKey := fieldMap.resolve(FieldKeyFunc)
		if l, ok := data[funcKey]; ok {
			data["fields."+funcKey] = l
		}
		fileKey := fieldMap.resolve(FieldKeyFile)
		if l, ok := data[fileKey]; ok {
			data["fields."+fileKey] = l
		}
	}
}