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error.go
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error.go
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// Copyright 2017 VMware, Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package util
import (
"fmt"
"net/http"
)
func StatusCode(err error) int {
e, ok := err.(statusCode)
if !ok {
return http.StatusInternalServerError
}
return e.Code()
}
func NewError(code int, message string, a ...interface{}) error {
if a != nil {
return httpError{code: code, message: fmt.Sprintf(message, a...)}
}
return httpError{code: code, message: message}
}
func WrapError(code int, err error) error {
return wrappedError{error: err, code: code}
}
// Pattern based on https://dave.cheney.net/2016/04/27/dont-just-check-errors-handle-them-gracefully
type statusCode interface {
Code() int
}
type httpError struct {
code int
message string
}
func (e httpError) Code() int {
return e.code
}
func (e httpError) Error() string {
return e.message
}
type wrappedError struct {
error
code int
}
func (e wrappedError) Code() int {
return e.code
}
func (e wrappedError) Error() string {
return e.error.Error()
}