Embed zap.Field into error.

This is a Go's small library to embed zap's Fields into error.

This inspired to suzuki-shunsuke/logrus-error.

With fmt.Errorf, you can add additional context to error.

e.g.

fmt.Errorf("get a user: %w", err)

uber-go/zap is one of most popular structured logging library.

e.g.

logger.Info("get a user",
  zap.String("username", username),
  zap.Error(err),
)

fmt.Errorf is very useful, but you can add only a string to error as context. You can't add structured data to error. If you use zap, you may want to add structured data to error.

zap-error is a small library to add structured data to error and get structured data from error for logging.

Mainly zap-error provides only two simple API.

• WithFields: Add structured data to error
• ToFields: Get structured data from error and return []zap.Field

AS IS (without zap-error)

return fmt.Errorf("get a user (username: %s): %w", username, err)

zap.Error("add a member to a group", zap.Error(err))

TO BE (with zap-error)

return logerr.WithFields(fmt.Errorf("get a user: %w", err), zap.String("username", username))

logger.Error("add a member to a group", logerr.ToFields(err)...)

Using zap-error, you can add structured data to error as context. You don't have to construct a string with fmt's format.

Please see https://pkg.go.dev/github.com/suzuki-shunsuke/zap-error/logerr

MIT