gogmagog/models/errors.go

package models

import (
	"database/sql"
	"golang.org/x/crypto/bcrypt"
)

type notFoundError struct {
	error
}

func (e *notFoundError) NotFound() bool {
	return true
}

// IsNotFoundError returns true if the model deems it a not found error.
func IsNotFoundError(err error) bool {
	type notFound interface {
		NotFound() bool
	}
	te, ok := err.(notFound)
	return ok && te.NotFound()
}

func wrapNotFound(err error) error {
	if err == sql.ErrNoRows {
		return &notFoundError{error: err}
	}
	return err
}

type invalidLoginError struct {
	error
}

func (e *invalidLoginError) InvalidLogin() bool {
	return true
}

// IsInvalidLoginError returns true if the model deems it an invalid login error.
func IsInvalidLoginError(err error) bool {
	type invalidLogin interface {
		InvalidLogin() bool
	}
	te, ok := err.(invalidLogin)
	return ok && te.InvalidLogin()
}

func wrapInvalidLogin(err error) error {
	if err == sql.ErrNoRows || err == bcrypt.ErrMismatchedHashAndPassword {
		return &invalidLoginError{error: err}
	}
	return err
}