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// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package errors provide an error type with code.
package errors
import (
"net/http"
"reflect"
)
// E define custom error that wrap underlying error with custom code, message,
// and name.
//
// The Code field is required, used to communicate the HTTP response code.
// The Message field is optional, it's used to communicate the actual error
// message from server, to be readable by human.
// The Name field is optional, intended to be consumed by program, for
// example, to provide a key as translation of Message into user's locale
// defined language.
type E struct {
Code int `json:"code,omitempty"`
Message string `json:"message,omitempty"`
Name string `json:"name,omitempty"`
err error
}
// Internal define an error caused by server.
func Internal(err error) *E {
return &E{
Code: http.StatusInternalServerError,
Message: "internal server error",
Name: "ERR_INTERNAL",
err: err,
}
}
// InvalidInput generate an error for invalid input.
func InvalidInput(field string) *E {
return &E{
Code: http.StatusBadRequest,
Message: "invalid input: " + field,
Name: "ERR_INVALID_INPUT",
}
}
// Error implement the error interface.
func (e *E) Error() string {
return e.Message
}
// As set the target to e only if only target is **E.
func (e *E) As(target interface{}) bool {
_, ok := target.(**E)
if ok {
val := reflect.ValueOf(target)
val.Elem().Set(reflect.ValueOf(e))
return ok
}
return false
}
// Unwrap return the internal error.
func (e *E) Unwrap() error {
return e.err
}
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