log

log

log provides generic logger interface so your application does not need to know which logger adapter you use. This simplify testing and keep the code clean.

How to Use

Logger interface contains commonly used logging usecases. Inject Logger into your object.

// service.go
type service struct {
  logger log.Logger
}

func NewService(logger log.Logger) *service {
  return &service{logger: logger}
}

func (s *service) DoSomething() error {
  // do your thing
  if err != nil {
    s.logger.Error("some error happened")
    return err
  }
}

// main.go
import (
  "github.com/sirupsen/logrus"

	gogox_logrus "github.com/raymondwongso/gogox/log/logrus"
)

func main() {
  logrus := logrus.New()
  logrus.SetFormatter(&logrus.JSONFormatter{})
  logrus.SetLevel(logrus.DebugLevel)

  logger := gogox_logrus.New(logrus, nil)

  service := service.NewService(logger)
}

Currently supported adapters:

1. Logrus
2. Zap
3. Zerolog (Will be available in 1.x)
4. Nop

Metadata

You can add metadata into your log entries, commonly used to store additional error info. Use [severity]w method.

s.logger.Errorw("some error happened", log.Metadata{"error": err.Error(), "user_id": 123})

// result
{"error":"some error happened","level":"error","msg":"some error happened","service":"api_logrus","time":"2023-02-03T11:32:54+07:00","user_id":123}

You can also add baseMetadata into your logger instance, commonly used to store global metadata for all your log entries.

logger := gogox_logrus.New(logrus, log.Metadata{"service": "api", "version": "1.2.1"})

s.logger.Errorw("some error happened", log.Metadata{"error": err.Error(), "user_id": 123})

// result
{"error":"some error come up","level":"error","msg":"some error come up","service":"api","time":"2023-02-03T11:35:25+07:00","user_id":1,"version":"1.2.1"}

Context

Context is useful for passing base metadata into all your log entries. Use NewContext to inject your log metadata to context.

ctx := log.NewContext(context.Background(), log.Metadata{"user_id": 123})

Use MetadataFromContext to extract your log metadata from context

md := log.MetadataFromContext(ctx)