Golang errors.NewGenericServerResponse函数代码示例

// transformUnstructuredResponseError handles an error from the server that is not in a structured form.
// It is expected to transform any response that is not recognizable as a clear server sent error from the
// K8S API using the information provided with the request. In practice, HTTP proxies and client libraries
// introduce a level of uncertainty to the responses returned by servers that in common use result in
// unexpected responses. The rough structure is:
//
// 1. Assume the server sends you something sane - JSON + well defined error objects + proper codes
//    - this is the happy path
//    - when you get this output, trust what the server sends
// 2. Guard against empty fields / bodies in received JSON and attempt to cull sufficient info from them to
//    generate a reasonable facsimile of the original failure.
//    - Be sure to use a distinct error type or flag that allows a client to distinguish between this and error 1 above
// 3. Handle true disconnect failures / completely malformed data by moving up to a more generic client error
// 4. Distinguish between various connection failures like SSL certificates, timeouts, proxy errors, unexpected
//    initial contact, the presence of mismatched body contents from posted content types
//    - Give these a separate distinct error type and capture as much as possible of the original message
//
// TODO: introduce transformation of generic http.Client.Do() errors that separates 4.
func (r *Request) transformUnstructuredResponseError(resp *http.Response, req *http.Request, body []byte) error {
	if body == nil && resp.Body != nil {
		if data, err := ioutil.ReadAll(resp.Body); err == nil {
			body = data
		}
	}
	glog.V(8).Infof("Response Body: %s", string(body))

	message := "unknown"
	if isTextResponse(resp) {
		message = strings.TrimSpace(string(body))
	}
	retryAfter, _ := retryAfterSeconds(resp)
	return errors.NewGenericServerResponse(
		resp.StatusCode,
		req.Method,
		unversioned.GroupResource{
			Group:    r.content.GroupVersion.Group,
			Resource: r.resource,
		},
		r.resourceName,
		message,
		retryAfter,
		true,
	)
}

func serviceErrorHandler(s runtime.NegotiatedSerializer, serviceErr restful.ServiceError, request *restful.Request, response *restful.Response) {
	errorNegotiated(
		apierrors.NewGenericServerResponse(serviceErr.Code, "", api.Resource(""), "", serviceErr.Message, 0, false),
		s,
		schema.GroupVersion{},
		response.ResponseWriter,
		request.Request,
	)
}

func (checker GenericHttpResponseChecker) Check(resp *http.Response) error {
	if resp.StatusCode < http.StatusOK || resp.StatusCode > http.StatusPartialContent {
		defer resp.Body.Close()
		bodyBytes, err := ioutil.ReadAll(io.LimitReader(resp.Body, maxReadLength))
		if err != nil {
			return errors.NewInternalError(err)
		}
		bodyText := string(bodyBytes)

		switch {
		case resp.StatusCode == http.StatusInternalServerError:
			return errors.NewInternalError(fmt.Errorf("%s", bodyText))
		case resp.StatusCode == http.StatusBadRequest:
			return errors.NewBadRequest(bodyText)
		case resp.StatusCode == http.StatusNotFound:
			return errors.NewGenericServerResponse(resp.StatusCode, "", checker.QualifiedResource, checker.Name, bodyText, 0, false)
		}
		return errors.NewGenericServerResponse(resp.StatusCode, "", checker.QualifiedResource, checker.Name, bodyText, 0, false)
	}
	return nil
}

//TODO: Unify with RecoverPanics?
func logStackOnRecover(panicReason interface{}, httpWriter http.ResponseWriter) {
	var buffer bytes.Buffer
	buffer.WriteString(fmt.Sprintf("recover from panic situation: - %v\r\n", panicReason))
	for i := 2; ; i += 1 {
		_, file, line, ok := rt.Caller(i)
		if !ok {
			break
		}
		buffer.WriteString(fmt.Sprintf("    %s:%d\r\n", file, line))
	}
	glog.Errorln(buffer.String())

	// TODO: make status unversioned or plumb enough of the request to deduce the requested API version
	errorJSON(apierrors.NewGenericServerResponse(http.StatusInternalServerError, "", "", "", "", 0, false), latest.GroupOrDie("").Codec, httpWriter)
}

func serviceErrorHandler(requestResolver *APIRequestInfoResolver, apiVersions []string, serviceErr restful.ServiceError, request *restful.Request, response *restful.Response) {
	requestInfo, err := requestResolver.GetAPIRequestInfo(request.Request)
	codec := latest.GroupOrDie("").Codec
	if err == nil && requestInfo.APIVersion != "" {
		// check if the api version is valid.
		for _, version := range apiVersions {
			if requestInfo.APIVersion == version {
				// valid api version.
				codec = runtime.CodecFor(api.Scheme, requestInfo.APIVersion)
				break
			}
		}
	}

	errorJSON(apierrors.NewGenericServerResponse(serviceErr.Code, "", "", "", "", 0, false), codec, response.ResponseWriter)
}

//TODO: Unify with RecoverPanics?
func logStackOnRecover(s runtime.NegotiatedSerializer, panicReason interface{}, w http.ResponseWriter) {
	var buffer bytes.Buffer
	buffer.WriteString(fmt.Sprintf("recover from panic situation: - %v\r\n", panicReason))
	for i := 2; ; i += 1 {
		_, file, line, ok := rt.Caller(i)
		if !ok {
			break
		}
		buffer.WriteString(fmt.Sprintf("    %s:%d\r\n", file, line))
	}
	glog.Errorln(buffer.String())

	headers := http.Header{}
	if ct := w.Header().Get("Content-Type"); len(ct) > 0 {
		headers.Set("Accept", ct)
	}
	errorNegotiated(apierrors.NewGenericServerResponse(http.StatusInternalServerError, "", api.Resource(""), "", "", 0, false), s, unversioned.GroupVersion{}, w, &http.Request{Header: headers})
}

// newUnstructuredResponseError instantiates the appropriate generic error for the provided input. It also logs the body.
func (r *Request) newUnstructuredResponseError(body []byte, isTextResponse bool, statusCode int, method string, retryAfter int) error {
	// cap the amount of output we create
	if len(body) > maxUnstructuredResponseTextBytes {
		body = body[:maxUnstructuredResponseTextBytes]
	}

	message := "unknown"
	if isTextResponse {
		message = strings.TrimSpace(string(body))
	}
	return errors.NewGenericServerResponse(
		statusCode,
		method,
		schema.GroupResource{
			Group:    r.content.GroupVersion.Group,
			Resource: r.resource,
		},
		r.resourceName,
		message,
		retryAfter,
		true,
	)
}

func serviceErrorHandler(s runtime.NegotiatedSerializer, requestResolver *RequestInfoResolver, apiVersions []string, serviceErr restful.ServiceError, request *restful.Request, response *restful.Response) {
	errorNegotiated(apierrors.NewGenericServerResponse(serviceErr.Code, "", api.Resource(""), "", "", 0, false), s, unversioned.GroupVersion{}, response.ResponseWriter, request.Request)
}