kurz/domain/errors.go

package domain

import (
	"errors"
	"fmt"
)

type ErrorKind int

const (
	NoError ErrorKind = iota
	Unimplemented

	ShortNotCreated
	ShortNotFound

	TargetBlockedError
	TargetCensoredError
	TargetInvalidError

	StorageReadError
	StorageWriteError
	StorageUnspecifiedError
)

var Errors = map[ErrorKind]string{
	NoError:       "No error",
	Unimplemented: "Not yet implemented",

	ShortNotCreated: "Short URL not created for a new target",
	ShortNotFound:   "Short URL not defined",

	TargetBlockedError:  "Target blocked",
	TargetCensoredError: "Target unavailable for legal reasons",
	TargetInvalidError:  "Target invalid",

	StorageReadError:        "Storage read error",
	StorageWriteError:       "Storage write error",
	StorageUnspecifiedError: "Storage unspecified error",
}

type Error struct {
	error
	Kind ErrorKind
}

func MakeError(kind ErrorKind, detail string) Error {
	var message string
	if len(detail) == 0 {
		message = Errors[kind]
	} else {
		message = fmt.Sprintf("%s: %s", Errors[kind], detail)
	}

	return Error{
		Kind:  kind,
		error: errors.New(message),
	}
}