error.go

package main

import (
	"errors"
	"fmt"
	"net/http"
)

var (
	// ErrInternalServer is a 500 error
	ErrInternalServer = NewError(http.StatusInternalServerError, errors.New("internal server error"))
	// ErrNotFound is a 404 error.
	ErrNotFound = NewError(http.StatusNotFound, errors.New("not found"))
	// ErrMethodNotAllowed is a 405 error.
	ErrMethodNotAllowed = NewError(http.StatusMethodNotAllowed, errors.New("method not allowed"))
)

// NewErrBadRequestF returns a 404 bad request error
func NewErrNotFoundF(format string, a ...interface{}) Error {
	return NewError(http.StatusNotFound, fmt.Errorf(format, a...))
}

// Error is a HTTP error.
type Error interface {
	error
	Status() int
}

type httpError struct {
	error
	status int
}

func (e *httpError) Status() int { return e.status }

// NewError creates a new HTTP error.
func NewError(status int, err error) Error {
	return &httpError{err, status}
}