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errors.go
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/
errors.go
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// Copyright (c) 2017 Epracom Advies.
//
// 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 restkit
import "net/http"
var (
ForbiddenError = newErrorResponseWithStatusCodeFunc(http.StatusForbidden)
InternalServerError = newErrorResponseWithStatusCodeFunc(http.StatusInternalServerError)
BadRequestError = newErrorResponseWithStatusCodeFunc(http.StatusBadRequest)
NotFoundError = newErrorResponseWithStatusCodeFunc(http.StatusNotFound)
ConflictError = newErrorResponseWithStatusCodeFunc(http.StatusConflict)
PreconditionFailedError = newErrorResponseWithStatusCodeFunc(http.StatusPreconditionFailed)
UnauthorizedError = newErrorResponseWithStatusCodeFunc(http.StatusUnauthorized)
WithStack = func(err error) error { return err }
Cause = func(err error) error { return err }
)
func IsStatusBadRequest(err error) bool {
return isErrorResponseWithStatusCode(err, http.StatusBadRequest)
}
func IsStatusForbidden(err error) bool {
return isErrorResponseWithStatusCode(err, http.StatusForbidden)
}
func IsStatusInternalServer(err error) bool {
return isErrorResponseWithStatusCode(err, http.StatusInternalServerError)
}
func IsStatusNotFound(err error) bool {
return isErrorResponseWithStatusCode(err, http.StatusNotFound)
}
func IsStatusConflict(err error) bool {
return isErrorResponseWithStatusCode(err, http.StatusConflict)
}
func IsStatusPreconditionFailed(err error) bool {
return isErrorResponseWithStatusCode(err, http.StatusPreconditionFailed)
}
func IsStatusUnauthorizedError(err error) bool {
return isErrorResponseWithStatusCode(err, http.StatusUnauthorized)
}
type ErrorResponse struct {
TheError struct {
Message string `json:"message,omitempty"`
Code int `json:"code,omitempty"`
} `json:"error"`
// HTTP status code
statusCode int `json:"-"`
}
func (er *ErrorResponse) Error() string {
return er.TheError.Message
}
// HTTPStatusCode returns the status code of the given ErrorResponse if
// such a status code was set. Otherwise it returns http.StatusBadRequest.
func (er *ErrorResponse) HTTPStatusCode() int {
if er.statusCode != 0 {
return er.statusCode
}
return http.StatusBadRequest
}
func IsErrorResponseWithCode(err error, code int) bool {
if er, ok := Cause(err).(*ErrorResponse); ok {
return er.TheError.Code == code
}
return false
}
func IsErrorResponseWithCodeFunc(code int) func(error) bool {
return func(err error) bool {
return IsErrorResponseWithCode(err, code)
}
}
func isErrorResponseWithStatusCode(err error, statusCode int) bool {
if er, ok := Cause(err).(*ErrorResponse); ok {
return er.statusCode == statusCode
}
return false
}
func NewErrorResponse(message string, code int) error {
er := &ErrorResponse{}
er.TheError.Message = message
er.TheError.Code = code
return er
}
func newErrorResponseWithStatusCodeFunc(statusCode int) func(string, int) error {
return func(message string, code int) error {
er := &ErrorResponse{}
er.TheError.Message = message
er.TheError.Code = code
er.statusCode = statusCode
return er
}
}
// NewErrorResponseFromError creates an ErrorResponse from the given error.
// This ErrorResponse can be sent directly to an HttpResponseWriter.
func NewErrorResponseFromError(err error) ErrorResponse {
var er *ErrorResponse
if erX, ok := err.(*ErrorResponse); ok {
er = erX
} else if erX, ok := Cause(err).(*ErrorResponse); ok {
er = erX
msg := err.Error()
if msg != "" {
er.TheError.Message = msg
}
} else {
er = &ErrorResponse{}
er.TheError.Message = err.Error()
er.TheError.Code = -1
}
return *er
}