Is there a way to do matching error on client side ?

[fahmifan]

I'm trying oto and thanks it's made creating a client lib so easy. I wonder could oto create an error object for the client-side ? I imagine something like this

// definition.go
type ServiceError int

const (
	ErrInternal          ServiceError = 1000
	ErrPermissionDenined ServiceError = 1001
	ErrInvalidArgument   ServiceError = 1002
)

func (s ServiceError) Error() string {
	switch s {
	default: // ErrInternal
		return "internal"
        case ErrInvalidArgument:
                return "invalid_argument" 
	case ErrPermissionDenined:
		return "permission_denied"
	}
}

// client.js
const ErrInvalidArgument = new Error('permission_denied')

// index.js
try {
   res = await greeter.Greets(req)
} catch (err) {
   switch (err.message) {
    case greeter.ErrInvalidArgument:
        // do something
     case greeter.ErrPermissionDenined:
        // do something
     case greeter.ErrInternal:
        // do something
   }
}

[matryer]

Hey @fahmifan, I could see a reason to do this. You could modify the template and make this for yourself, but do you think the standard Oto template should also do this as well?

[fahmifan]

@matryer That would be great really great, if OTO has this feature built in!
Unfortuantely i haven't got a chance to try implement the custom template my self, I'll try it if i got the chance