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errors.go
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errors.go
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package errors
import (
"errors"
)
var DefaultUserError = errors.New("Something went wrong.")
type Error struct {
error error
userError error
}
func (e Error) Error() string {
return e.error.Error()
}
func (e Error) UserError() error {
return e.userError
}
// Cause takes any error and will return the first user-friendly error it finds
// as it traverses up through the linked list. If there are no user-friendly
// causes found, nil is returned.
func User(err error) error {
type errCauser interface {
Cause() error
}
type errUser interface {
UserError() error
}
for err != nil {
user, ok := err.(errUser)
if ok {
return user.UserError()
}
cause, ok := err.(errCauser)
if !ok {
break
}
err = cause.Cause()
}
return nil
}
func NewError(err, user error) error {
if err == nil {
return nil
}
if user == nil {
user = DefaultUserError
}
return &Error{
error: err,
userError: user,
}
}
func NewErrorString(err, user string) error {
if err == "" {
return nil
}
return &Error{
error: errors.New(err),
userError: errors.New(user),
}
}