apperr provides a unified application error generation interface. Errors can be localized and converted to GRPC, Twirp, HTTP, etc. equivalents

To install apperr, simly run:

$ go get github.com/harwoeck/apperr

To create errors use one of the provided functions from apperr, like apperr.Unauthenticated(msg)

err := apperr.Unauthenticated("provided password is invalid",
    apperr.Localize("INVALID_PASSWORD"))

apperr can provide localized error messages to users, when a LocalizationProvider is available. In order to add a translation message id to your *AppError you can use one of the provided Option (in the example Localize(messageID) is used)

In order to render an *AppError into a *RenderedError use the static function Render:

rendered, _ := apperr.Render(err, apperr.RenderLocalized(adapter, "en-US"))

Use the Convert function from your installed converter to translate the *RenderedError from last step to your frameworks native error type:

• GRPC
  • Install converter go get github.com/harwoeck/apperr/x/grpcerr

  • grpcStatus, err := grpcerr.Convert(*finalized.Error)

• HTTP
  • Install converter go get github.com/harwoeck/apperr/x/httperr

  • httpStatus, httpBody, err := httperr.Convert(*finalized.Error)

• Twirp
  • Install converter go get github.com/harwoeck/apperr/x/twirperr

  • twirpError := twirperr.Convert(*finalized.Error)

• Terminal or Console
  • Install converter go get github.com/harwoeck/apperr/x/terminalerr

  • output := terminalerr.Convert(*finalized.Error)
    fmt.Println(output)