Golang flushwriter.Wrap函数代码示例

// write renders a returned runtime.Object to the response as a stream or an encoded object. If the object
// returned by the response implements rest.ResourceStreamer that interface will be used to render the
// response. The Accept header and current API version will be passed in, and the output will be copied
// directly to the response body. If content type is returned it is used, otherwise the content type will
// be "application/octet-stream". All other objects are sent to standard JSON serialization.
func write(statusCode int, apiVersion string, codec runtime.Codec, object runtime.Object, w http.ResponseWriter, req *http.Request) {
	if stream, ok := object.(rest.ResourceStreamer); ok {
		out, flush, contentType, err := stream.InputStream(apiVersion, req.Header.Get("Accept"))
		if err != nil {
			errorJSONFatal(err, codec, w)
			return
		}
		if out == nil {
			// No output provided - return StatusNoContent
			w.WriteHeader(http.StatusNoContent)
			return
		}
		defer out.Close()
		if len(contentType) == 0 {
			contentType = "application/octet-stream"
		}
		w.Header().Set("Content-Type", contentType)
		w.WriteHeader(statusCode)
		writer := w.(io.Writer)
		if flush {
			writer = flushwriter.Wrap(w)
		}
		io.Copy(writer, out)
		return
	}
	writeJSON(statusCode, codec, object, w, isPrettyPrint(req))
}

// getContainerLogs handles containerLogs request against the Kubelet
func (s *Server) getContainerLogs(request *restful.Request, response *restful.Response) {
	podNamespace := request.PathParameter("podNamespace")
	podID := request.PathParameter("podID")
	containerName := request.PathParameter("containerName")

	if len(podID) == 0 {
		// TODO: Why return JSON when the rest return plaintext errors?
		response.WriteError(http.StatusBadRequest, fmt.Errorf(`{"message": "Missing podID."}`))
		return
	}
	if len(containerName) == 0 {
		// TODO: Why return JSON when the rest return plaintext errors?
		response.WriteError(http.StatusBadRequest, fmt.Errorf(`{"message": "Missing container name."}`))
		return
	}
	if len(podNamespace) == 0 {
		// TODO: Why return JSON when the rest return plaintext errors?
		response.WriteError(http.StatusBadRequest, fmt.Errorf(`{"message": "Missing podNamespace."}`))
		return
	}

	follow, _ := strconv.ParseBool(request.QueryParameter("follow"))
	previous, _ := strconv.ParseBool(request.QueryParameter("previous"))
	tail := request.QueryParameter("tail")

	pod, ok := s.host.GetPodByName(podNamespace, podID)
	if !ok {
		response.WriteError(http.StatusNotFound, fmt.Errorf("Pod %q does not exist", podID))
		return
	}
	// Check if containerName is valid.
	containerExists := false
	for _, container := range pod.Spec.Containers {
		if container.Name == containerName {
			containerExists = true
		}
	}
	if !containerExists {
		response.WriteError(http.StatusNotFound, fmt.Errorf("Container %q not found in Pod %q", containerName, podID))
		return
	}

	if _, ok := response.ResponseWriter.(http.Flusher); !ok {
		response.WriteError(http.StatusInternalServerError, fmt.Errorf("unable to convert %v into http.Flusher", response))
		return
	}
	fw := flushwriter.Wrap(response)
	response.Header().Set("Transfer-Encoding", "chunked")
	response.WriteHeader(http.StatusOK)
	err := s.host.GetKubeletContainerLogs(kubecontainer.GetPodFullName(pod), containerName, tail, follow, previous, fw, fw)
	if err != nil {
		response.WriteError(http.StatusInternalServerError, err)
		return
	}
}

// write renders a returned runtime.Object to the response as a stream or an encoded object. If the object
// returned by the response implements rest.ResourceStreamer that interface will be used to render the
// response. The Accept header and current API version will be passed in, and the output will be copied
// directly to the response body. If content type is returned it is used, otherwise the content type will
// be "application/octet-stream". All other objects are sent to standard JSON serialization.
func write(statusCode int, gv schema.GroupVersion, s runtime.NegotiatedSerializer, object runtime.Object, w http.ResponseWriter, req *http.Request) {
	stream, ok := object.(rest.ResourceStreamer)
	if !ok {
		writeNegotiated(s, gv, w, req, statusCode, object)
		return
	}

	out, flush, contentType, err := stream.InputStream(gv.String(), req.Header.Get("Accept"))
	if err != nil {
		errorNegotiated(err, s, gv, w, req)
		return
	}
	if out == nil {
		// No output provided - return StatusNoContent
		w.WriteHeader(http.StatusNoContent)
		return
	}
	defer out.Close()

	if wsstream.IsWebSocketRequest(req) {
		r := wsstream.NewReader(out, true, wsstream.NewDefaultReaderProtocols())
		if err := r.Copy(w, req); err != nil {
			utilruntime.HandleError(fmt.Errorf("error encountered while streaming results via websocket: %v", err))
		}
		return
	}

	if len(contentType) == 0 {
		contentType = "application/octet-stream"
	}
	w.Header().Set("Content-Type", contentType)
	w.WriteHeader(statusCode)
	writer := w.(io.Writer)
	if flush {
		writer = flushwriter.Wrap(w)
	}
	io.Copy(writer, out)
}

// write renders a returned runtime.Object to the response as a stream or an encoded object. If the object
// returned by the response implements rest.ResourceStreamer that interface will be used to render the
// response. The Accept header and current API version will be passed in, and the output will be copied
// directly to the response body. If content type is returned it is used, otherwise the content type will
// be "application/octet-stream". All other objects are sent to standard JSON serialization.
func write(statusCode int, apiVersion string, codec runtime.Codec, object runtime.Object, w http.ResponseWriter, req *http.Request) {
	if stream, ok := object.(rest.ResourceStreamer); ok {
		out, flush, contentType, err := stream.InputStream(apiVersion, req.Header.Get("Accept"))
		if err != nil {
			errorJSONFatal(err, codec, w)
			return
		}
		if out == nil {
			// No output provided - return StatusNoContent
			w.WriteHeader(http.StatusNoContent)
			return
		}
		defer out.Close()

		if wsstream.IsWebSocketRequest(req) {
			r := wsstream.NewReader(out, true)
			if err := r.Copy(w, req); err != nil {
				util.HandleError(fmt.Errorf("error encountered while streaming results via websocket: %v", err))
			}
			return
		}

		if len(contentType) == 0 {
			contentType = "application/octet-stream"
		}
		w.Header().Set("Content-Type", contentType)
		w.WriteHeader(statusCode)
		writer := w.(io.Writer)
		if flush {
			writer = flushwriter.Wrap(w)
		}
		io.Copy(writer, out)
		return
	}
	writeJSON(statusCode, codec, object, w, isPrettyPrint(req))
}

// getContainerLogs handles containerLogs request against the Kubelet
func (s *Server) getContainerLogs(request *restful.Request, response *restful.Response) {
	podNamespace := request.PathParameter("podNamespace")
	podID := request.PathParameter("podID")
	containerName := request.PathParameter("containerName")

	if len(podID) == 0 {
		// TODO: Why return JSON when the rest return plaintext errors?
		// TODO: Why return plaintext errors?
		response.WriteError(http.StatusBadRequest, fmt.Errorf(`{"message": "Missing podID."}`))
		return
	}
	if len(containerName) == 0 {
		// TODO: Why return JSON when the rest return plaintext errors?
		response.WriteError(http.StatusBadRequest, fmt.Errorf(`{"message": "Missing container name."}`))
		return
	}
	if len(podNamespace) == 0 {
		// TODO: Why return JSON when the rest return plaintext errors?
		response.WriteError(http.StatusBadRequest, fmt.Errorf(`{"message": "Missing podNamespace."}`))
		return
	}

	query := request.Request.URL.Query()
	// backwards compatibility for the "tail" query parameter
	if tail := request.QueryParameter("tail"); len(tail) > 0 {
		query["tailLines"] = []string{tail}
		// "all" is the same as omitting tail
		if tail == "all" {
			delete(query, "tailLines")
		}
	}
	// container logs on the kubelet are locked to v1
	versioned := &v1.PodLogOptions{}
	if err := api.Scheme.Convert(&query, versioned); err != nil {
		response.WriteError(http.StatusBadRequest, fmt.Errorf(`{"message": "Unable to decode query."}`))
		return
	}
	out, err := api.Scheme.ConvertToVersion(versioned, "")
	if err != nil {
		response.WriteError(http.StatusBadRequest, fmt.Errorf(`{"message": "Unable to convert request query."}`))
		return
	}
	logOptions := out.(*api.PodLogOptions)
	logOptions.TypeMeta = unversioned.TypeMeta{}
	if errs := validation.ValidatePodLogOptions(logOptions); len(errs) > 0 {
		response.WriteError(apierrs.StatusUnprocessableEntity, fmt.Errorf(`{"message": "Invalid request."}`))
		return
	}

	pod, ok := s.host.GetPodByName(podNamespace, podID)
	if !ok {
		response.WriteError(http.StatusNotFound, fmt.Errorf("Pod %q does not exist", podID))
		return
	}
	// Check if containerName is valid.
	containerExists := false
	for _, container := range pod.Spec.Containers {
		if container.Name == containerName {
			containerExists = true
		}
	}
	if !containerExists {
		response.WriteError(http.StatusNotFound, fmt.Errorf("Container %q not found in Pod %q", containerName, podID))
		return
	}

	if _, ok := response.ResponseWriter.(http.Flusher); !ok {
		response.WriteError(http.StatusInternalServerError, fmt.Errorf("unable to convert %v into http.Flusher", response))
		return
	}
	fw := flushwriter.Wrap(response.ResponseWriter)
	if logOptions.LimitBytes != nil {
		fw = limitwriter.New(fw, *logOptions.LimitBytes)
	}
	response.Header().Set("Transfer-Encoding", "chunked")
	response.WriteHeader(http.StatusOK)
	if err := s.host.GetKubeletContainerLogs(kubecontainer.GetPodFullName(pod), containerName, logOptions, fw, fw); err != nil {
		if err != limitwriter.ErrMaximumWrite {
			response.WriteError(http.StatusInternalServerError, err)
		}
		return
	}
}

// handleContainerLogs handles containerLogs request against the Kubelet
func (s *Server) handleContainerLogs(w http.ResponseWriter, req *http.Request) {
	defer req.Body.Close()
	u, err := url.ParseRequestURI(req.RequestURI)
	if err != nil {
		s.error(w, err)
		return
	}
	parts := strings.Split(u.Path, "/")

	// req URI: /containerLogs/<podNamespace>/<podID>/<containerName>
	var podNamespace, podID, containerName string
	if len(parts) == 5 {
		podNamespace = parts[2]
		podID = parts[3]
		containerName = parts[4]
	} else {
		http.Error(w, "Unexpected path for command running", http.StatusBadRequest)
		return
	}

	if len(podID) == 0 {
		http.Error(w, `{"message": "Missing podID."}`, http.StatusBadRequest)
		return
	}
	if len(containerName) == 0 {
		http.Error(w, `{"message": "Missing container name."}`, http.StatusBadRequest)
		return
	}
	if len(podNamespace) == 0 {
		http.Error(w, `{"message": "Missing podNamespace."}`, http.StatusBadRequest)
		return
	}

	uriValues := u.Query()
	follow, _ := strconv.ParseBool(uriValues.Get("follow"))
	previous, _ := strconv.ParseBool(uriValues.Get("previous"))
	tail := uriValues.Get("tail")

	pod, ok := s.host.GetPodByName(podNamespace, podID)
	if !ok {
		http.Error(w, fmt.Sprintf("Pod %q does not exist", podID), http.StatusNotFound)
		return
	}
	// Check if containerName is valid.
	containerExists := false
	for _, container := range pod.Spec.Containers {
		if container.Name == containerName {
			containerExists = true
		}
	}
	if !containerExists {
		http.Error(w, fmt.Sprintf("Container %q not found in Pod %q", containerName, podID), http.StatusNotFound)
		return
	}

	if _, ok := w.(http.Flusher); !ok {
		s.error(w, fmt.Errorf("unable to convert %v into http.Flusher", w))
		return
	}
	fw := flushwriter.Wrap(w)
	w.Header().Set("Transfer-Encoding", "chunked")
	w.WriteHeader(http.StatusOK)
	err = s.host.GetKubeletContainerLogs(kubecontainer.GetPodFullName(pod), containerName, tail, follow, previous, fw, fw)
	if err != nil {
		s.error(w, err)
		return
	}
}

// getContainerLogs handles containerLogs request against the Kubelet
func (s *Server) getContainerLogs(request *restful.Request, response *restful.Response) {
	podNamespace := request.PathParameter("podNamespace")
	podID := request.PathParameter("podID")
	containerName := request.PathParameter("containerName")

	if len(podID) == 0 {
		// TODO: Why return JSON when the rest return plaintext errors?
		// TODO: Why return plaintext errors?
		response.WriteError(http.StatusBadRequest, fmt.Errorf(`{"message": "Missing podID."}`))
		return
	}
	if len(containerName) == 0 {
		// TODO: Why return JSON when the rest return plaintext errors?
		response.WriteError(http.StatusBadRequest, fmt.Errorf(`{"message": "Missing container name."}`))
		return
	}
	if len(podNamespace) == 0 {
		// TODO: Why return JSON when the rest return plaintext errors?
		response.WriteError(http.StatusBadRequest, fmt.Errorf(`{"message": "Missing podNamespace."}`))
		return
	}

	query := request.Request.URL.Query()
	// backwards compatibility for the "tail" query parameter
	if tail := request.QueryParameter("tail"); len(tail) > 0 {
		query["tailLines"] = []string{tail}
		// "all" is the same as omitting tail
		if tail == "all" {
			delete(query, "tailLines")
		}
	}
	// container logs on the kubelet are locked to the v1 API version of PodLogOptions
	logOptions := &v1.PodLogOptions{}
	if err := api.ParameterCodec.DecodeParameters(query, v1.SchemeGroupVersion, logOptions); err != nil {
		response.WriteError(http.StatusBadRequest, fmt.Errorf(`{"message": "Unable to decode query."}`))
		return
	}
	logOptions.TypeMeta = metav1.TypeMeta{}
	if errs := validation.ValidatePodLogOptions(logOptions); len(errs) > 0 {
		response.WriteError(apierrs.StatusUnprocessableEntity, fmt.Errorf(`{"message": "Invalid request."}`))
		return
	}

	pod, ok := s.host.GetPodByName(podNamespace, podID)
	if !ok {
		response.WriteError(http.StatusNotFound, fmt.Errorf("pod %q does not exist\n", podID))
		return
	}
	// Check if containerName is valid.
	containerExists := false
	for _, container := range pod.Spec.Containers {
		if container.Name == containerName {
			containerExists = true
		}
	}
	if !containerExists {
		for _, container := range pod.Spec.InitContainers {
			if container.Name == containerName {
				containerExists = true
			}
		}
	}
	if !containerExists {
		response.WriteError(http.StatusNotFound, fmt.Errorf("container %q not found in pod %q\n", containerName, podID))
		return
	}

	if _, ok := response.ResponseWriter.(http.Flusher); !ok {
		response.WriteError(http.StatusInternalServerError, fmt.Errorf("unable to convert %v into http.Flusher, cannot show logs\n", reflect.TypeOf(response)))
		return
	}
	fw := flushwriter.Wrap(response.ResponseWriter)
	// Byte limit logic is already implemented in kuberuntime. However, we still need this for
	// old runtime integration.
	// TODO(random-liu): Remove this once we switch to CRI integration.
	if logOptions.LimitBytes != nil {
		fw = limitwriter.New(fw, *logOptions.LimitBytes)
	}
	response.Header().Set("Transfer-Encoding", "chunked")
	if err := s.host.GetKubeletContainerLogs(kubecontainer.GetPodFullName(pod), containerName, logOptions, fw, fw); err != nil {
		if err != limitwriter.ErrMaximumWrite {
			response.WriteError(http.StatusBadRequest, err)
		}
		return
	}
}