forked from kubevirt/kubevirt
/
subresource.go
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/
subresource.go
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/*
* This file is part of the KubeVirt project
*
* 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.
*
* Copyright 2018 Red Hat, Inc.
*
*/
package rest
import (
goerror "errors"
"fmt"
"io"
"net/http"
"github.com/emicklei/go-restful"
"github.com/gorilla/websocket"
k8sv1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
k8smetav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/client-go/kubernetes/scheme"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/remotecommand"
"kubevirt.io/kubevirt/pkg/api/v1"
"kubevirt.io/kubevirt/pkg/kubecli"
"kubevirt.io/kubevirt/pkg/log"
)
type SubresourceAPIApp struct {
VirtCli kubecli.KubevirtClient
}
func (app *SubresourceAPIApp) requestHandler(request *restful.Request, response *restful.Response, cmd []string) {
vmName := request.PathParameter("name")
namespace := request.PathParameter("namespace")
podName, httpStatusCode, err := app.remoteExecInfo(vmName, namespace)
if err != nil {
log.Log.Reason(err).Error("Failed to gather remote exec info for subresource request.")
response.WriteError(httpStatusCode, err)
return
}
var upgrader = websocket.Upgrader{
ReadBufferSize: kubecli.WebsocketMessageBufferSize,
WriteBufferSize: kubecli.WebsocketMessageBufferSize,
}
clientSocket, err := upgrader.Upgrade(response.ResponseWriter, request.Request, nil)
if err != nil {
log.Log.Reason(err).Error("Failed to upgrade client websocket connection")
response.WriteError(http.StatusBadRequest, err)
return
}
defer clientSocket.Close()
log.Log.Infof("Websocket connection upgraded")
wsReadWriter := &kubecli.BinaryReadWriter{Conn: clientSocket}
inReader, inWriter := io.Pipe()
outReader, outWriter := io.Pipe()
httpResponseChan := make(chan int)
copyErr := make(chan error)
go func() {
httpCode, err := remoteExecHelper(podName, namespace, cmd, inReader, outWriter)
log.Log.Errorf("%v", err)
httpResponseChan <- httpCode
}()
go func() {
_, err := io.Copy(wsReadWriter, outReader)
log.Log.Reason(err).Error("error ecountered reading from remote podExec stream")
copyErr <- err
}()
go func() {
_, err := io.Copy(inWriter, wsReadWriter)
log.Log.Reason(err).Error("error ecountered reading from websocket stream")
copyErr <- err
}()
httpResponseCode := http.StatusOK
select {
case httpResponseCode = <-httpResponseChan:
case err := <-copyErr:
if err != nil {
log.Log.Reason(err).Error("Error in websocket proxy")
httpResponseCode = http.StatusInternalServerError
}
}
response.WriteHeader(httpResponseCode)
}
func (app *SubresourceAPIApp) VNCRequestHandler(request *restful.Request, response *restful.Response) {
vmName := request.PathParameter("name")
namespace := request.PathParameter("namespace")
cmd := []string{"/sock-connector", fmt.Sprintf("/var/run/kubevirt-private/%s/%s/virt-%s", namespace, vmName, "vnc")}
app.requestHandler(request, response, cmd)
}
func (app *SubresourceAPIApp) ConsoleRequestHandler(request *restful.Request, response *restful.Response) {
vmName := request.PathParameter("name")
namespace := request.PathParameter("namespace")
cmd := []string{"/sock-connector", fmt.Sprintf("/var/run/kubevirt-private/%s/%s/virt-%s", namespace, vmName, "serial0")}
app.requestHandler(request, response, cmd)
}
func (app *SubresourceAPIApp) findPod(namespace string, name string) (string, error) {
fieldSelector := fields.ParseSelectorOrDie("status.phase==" + string(k8sv1.PodRunning))
labelSelector, err := labels.Parse(fmt.Sprintf(v1.AppLabel+"=virt-launcher,"+v1.DomainLabel+" in (%s)", name))
if err != nil {
return "", err
}
selector := k8smetav1.ListOptions{FieldSelector: fieldSelector.String(), LabelSelector: labelSelector.String()}
podList, err := app.VirtCli.CoreV1().Pods(namespace).List(selector)
if err != nil {
return "", err
}
if len(podList.Items) == 0 {
return "", goerror.New("connection failed. No VM pod is running")
}
return podList.Items[0].ObjectMeta.Name, nil
}
func (app *SubresourceAPIApp) remoteExecInfo(name string, namespace string) (string, int, error) {
podName := ""
vm, err := app.VirtCli.VM(namespace).Get(name, k8smetav1.GetOptions{})
if err != nil {
if errors.IsNotFound(err) {
return "", http.StatusNotFound, goerror.New(fmt.Sprintf("VM %s in namespace %s not found.", name, namespace))
}
return podName, http.StatusInternalServerError, err
}
if vm.IsRunning() == false {
return podName, http.StatusBadRequest, goerror.New(fmt.Sprintf("Unable to connect to VM because phase is %s instead of %s", vm.Status.Phase, v1.Running))
}
podName, err = app.findPod(namespace, name)
if err != nil {
return podName, http.StatusBadRequest, fmt.Errorf("unable to find matching pod for remote execution: %v", err)
}
return podName, http.StatusOK, nil
}
func remoteExecHelper(podName string, namespace string, cmd []string, in io.Reader, out io.Writer) (int, error) {
config, err := kubecli.GetConfig()
if err != nil {
return http.StatusInternalServerError, fmt.Errorf("unable to build api config for remote execution: %v", err)
}
gv := k8sv1.SchemeGroupVersion
config.GroupVersion = &gv
config.APIPath = "/api"
config.NegotiatedSerializer = serializer.DirectCodecFactory{CodecFactory: scheme.Codecs}
restClient, err := restclient.RESTClientFor(config)
if err != nil {
return http.StatusInternalServerError, fmt.Errorf("unable to create restClient for remote execution: %v", err)
}
containerName := "compute"
req := restClient.Post().
Resource("pods").
Name(podName).
Namespace(namespace).
SubResource("exec").
Param("container", containerName)
req = req.VersionedParams(&k8sv1.PodExecOptions{
Container: containerName,
Command: cmd,
Stdin: true,
Stdout: true,
Stderr: true,
TTY: true,
}, scheme.ParameterCodec)
// execute request
method := "POST"
url := req.URL()
exec, err := remotecommand.NewSPDYExecutor(config, method, url)
if err != nil {
return http.StatusInternalServerError, fmt.Errorf("remote execution failed: %v", err)
}
err = exec.Stream(remotecommand.StreamOptions{
Stdin: in,
Stdout: out,
Stderr: out,
Tty: false,
TerminalSizeQueue: nil,
})
if err != nil {
return http.StatusInternalServerError, fmt.Errorf("connection failed: %v", err)
}
return http.StatusOK, nil
}