/
vmi.go
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/
vmi.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 2017 Red Hat, Inc.
*
*/
package kubecli
import (
"bytes"
"fmt"
"io"
"net/http"
"net/url"
"time"
"github.com/gorilla/websocket"
v1 "github.com/kunalkushwaha/go-sdk/api/v1"
"github.com/kunalkushwaha/go-sdk/util/subresources"
k8smetav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
)
const (
WebsocketMessageBufferSize = 10240
)
func (k *kubevirt) VirtualMachineInstance(namespace string) VirtualMachineInstanceInterface {
return &vmis{
restClient: k.restClient,
config: k.config,
clientSet: k.Clientset,
namespace: namespace,
resource: "virtualmachineinstances",
}
}
type vmis struct {
restClient *rest.RESTClient
config *rest.Config
clientSet *kubernetes.Clientset
namespace string
resource string
master string
kubeconfig string
}
type BinaryReadWriter struct {
Conn *websocket.Conn
}
func (s *BinaryReadWriter) Write(p []byte) (int, error) {
wsFrameHeaderSize := 2 + 8 + 4 // Fixed header + length + mask (RFC 6455)
// our websocket package has an issue where it truncates messages
// when the message+header is greater than the buffer size we allocate.
// because of this, we have to chunk messages
chunkSize := WebsocketMessageBufferSize - wsFrameHeaderSize
bytesWritten := 0
for i := 0; i < len(p); i += chunkSize {
w, err := s.Conn.NextWriter(websocket.BinaryMessage)
if err != nil {
return bytesWritten, s.err(err)
}
defer w.Close()
end := i + chunkSize
if end > len(p) {
end = len(p)
}
n, err := w.Write(p[i:end])
if err != nil {
return bytesWritten, err
}
bytesWritten = n + bytesWritten
}
return bytesWritten, nil
}
func (s *BinaryReadWriter) Read(p []byte) (int, error) {
for {
msgType, r, err := s.Conn.NextReader()
if err != nil {
return 0, s.err(err)
}
switch msgType {
case websocket.BinaryMessage:
n, err := r.Read(p)
return n, s.err(err)
case websocket.CloseMessage:
return 0, io.EOF
}
}
}
func (s *BinaryReadWriter) err(err error) error {
if err == nil {
return nil
}
if e, ok := err.(*websocket.CloseError); ok {
if e.Code == websocket.CloseNormalClosure {
return io.EOF
}
}
return err
}
type RoundTripCallback func(conn *websocket.Conn, resp *http.Response, err error) error
type WebsocketRoundTripper struct {
Dialer *websocket.Dialer
Do RoundTripCallback
}
func (d *WebsocketRoundTripper) RoundTrip(r *http.Request) (*http.Response, error) {
conn, resp, err := d.Dialer.Dial(r.URL.String(), r.Header)
if err == nil {
defer conn.Close()
}
return resp, d.Do(conn, resp, err)
}
type asyncWSRoundTripper struct {
Done chan struct{}
Connection chan *websocket.Conn
}
func (aws *asyncWSRoundTripper) WebsocketCallback(ws *websocket.Conn, resp *http.Response, err error) error {
if err != nil {
if resp != nil && resp.StatusCode != http.StatusOK {
buf := new(bytes.Buffer)
buf.ReadFrom(resp.Body)
return fmt.Errorf("Can't connect to websocket (%d): %s\n", resp.StatusCode, buf.String())
}
return fmt.Errorf("Can't connect to websocket: %s\n", err.Error())
}
aws.Connection <- ws
// Keep the roundtripper open until we are done with the stream
<-aws.Done
return nil
}
func roundTripperFromConfig(config *rest.Config, callback RoundTripCallback) (http.RoundTripper, error) {
// Configure TLS
tlsConfig, err := rest.TLSConfigFor(config)
if err != nil {
return nil, err
}
// Configure the websocket dialer
dialer := &websocket.Dialer{
Proxy: http.ProxyFromEnvironment,
TLSClientConfig: tlsConfig,
WriteBufferSize: WebsocketMessageBufferSize,
ReadBufferSize: WebsocketMessageBufferSize,
Subprotocols: []string{subresources.PlainStreamProtocolName},
}
// Create a roundtripper which will pass in the final underlying websocket connection to a callback
rt := &WebsocketRoundTripper{
Do: callback,
Dialer: dialer,
}
// Make sure we inherit all relevant security headers
return rest.HTTPWrappersForConfig(config, rt)
}
func RequestFromConfig(config *rest.Config, vmi string, namespace string, resource string) (*http.Request, error) {
u, err := url.Parse(config.Host)
if err != nil {
return nil, err
}
switch u.Scheme {
case "https":
u.Scheme = "wss"
case "http":
u.Scheme = "ws"
default:
return nil, fmt.Errorf("Unsupported Protocol %s", u.Scheme)
}
u.Path = fmt.Sprintf("/apis/subresources.kubevirt.io/v1alpha3/namespaces/%s/virtualmachineinstances/%s/%s", namespace, vmi, resource)
req := &http.Request{
Method: http.MethodGet,
URL: u,
}
return req, nil
}
type wsStreamer struct {
conn *websocket.Conn
done chan struct{}
}
func (ws *wsStreamer) streamDone() {
close(ws.done)
}
func (ws *wsStreamer) Stream(options StreamOptions) error {
wsReadWriter := &BinaryReadWriter{Conn: ws.conn}
copyErr := make(chan error, 1)
go func() {
_, err := io.Copy(wsReadWriter, options.In)
copyErr <- err
}()
go func() {
_, err := io.Copy(options.Out, wsReadWriter)
copyErr <- err
}()
defer ws.streamDone()
return <-copyErr
}
func (v *vmis) VNC(name string) (StreamInterface, error) {
return v.asyncSubresourceHelper(name, "vnc")
}
type connectionStruct struct {
con StreamInterface
err error
}
func (v *vmis) SerialConsole(name string, timeout time.Duration) (StreamInterface, error) {
timeoutChan := time.Tick(timeout)
connectionChan := make(chan connectionStruct)
go func() {
for {
select {
case <-timeoutChan:
connectionChan <- connectionStruct{
con: nil,
err: fmt.Errorf("Timeout trying to connect to the virtual machine instance"),
}
return
default:
}
con, err := v.asyncSubresourceHelper(name, "console")
if err != nil {
asyncSubresourceError, ok := err.(*AsyncSubresourceError)
// return if response status code does not equal to 400
if !ok || asyncSubresourceError.GetStatusCode() != http.StatusBadRequest {
connectionChan <- connectionStruct{con: nil, err: err}
return
}
time.Sleep(1 * time.Second)
continue
}
connectionChan <- connectionStruct{con: con, err: nil}
return
}
}()
conStruct := <-connectionChan
return conStruct.con, conStruct.err
}
type AsyncSubresourceError struct {
err string
StatusCode int
}
func (a *AsyncSubresourceError) Error() string {
return a.err
}
func (a *AsyncSubresourceError) GetStatusCode() int {
return a.StatusCode
}
func (v *vmis) asyncSubresourceHelper(name string, resource string) (StreamInterface, error) {
done := make(chan struct{})
aws := &asyncWSRoundTripper{
Connection: make(chan *websocket.Conn),
Done: done,
}
// Create a round tripper with all necessary kubernetes security details
wrappedRoundTripper, err := roundTripperFromConfig(v.config, aws.WebsocketCallback)
if err != nil {
return nil, fmt.Errorf("unable to create round tripper for remote execution: %v", err)
}
// Create a request out of config and the query parameters
req, err := RequestFromConfig(v.config, name, v.namespace, resource)
if err != nil {
return nil, fmt.Errorf("unable to create request for remote execution: %v", err)
}
errChan := make(chan error, 1)
go func() {
// Send the request and let the callback do its work
response, err := wrappedRoundTripper.RoundTrip(req)
if err != nil {
statusCode := 0
if response != nil {
statusCode = response.StatusCode
}
errChan <- &AsyncSubresourceError{err: err.Error(), StatusCode: statusCode}
return
}
if response != nil {
switch response.StatusCode {
case http.StatusOK:
case http.StatusNotFound:
err = &AsyncSubresourceError{err: "Virtual Machine not found.", StatusCode: response.StatusCode}
case http.StatusInternalServerError:
err = &AsyncSubresourceError{err: "Websocket failed due to internal server error.", StatusCode: response.StatusCode}
default:
err = &AsyncSubresourceError{err: fmt.Sprintf("Websocket failed with http status: %s", response.Status), StatusCode: response.StatusCode}
}
} else {
err = &AsyncSubresourceError{err: "no response received"}
}
errChan <- err
}()
select {
case err = <-errChan:
return nil, err
case ws := <-aws.Connection:
return &wsStreamer{
conn: ws,
done: done,
}, nil
}
}
func (v *vmis) Get(name string, options *k8smetav1.GetOptions) (vmi *v1.VirtualMachineInstance, err error) {
vmi = &v1.VirtualMachineInstance{}
err = v.restClient.Get().
Resource(v.resource).
Namespace(v.namespace).
Name(name).
VersionedParams(options, scheme.ParameterCodec).
Do().
Into(vmi)
vmi.SetGroupVersionKind(v1.VirtualMachineInstanceGroupVersionKind)
return
}
func (v *vmis) List(options *k8smetav1.ListOptions) (vmiList *v1.VirtualMachineInstanceList, err error) {
vmiList = &v1.VirtualMachineInstanceList{}
err = v.restClient.Get().
Resource(v.resource).
Namespace(v.namespace).
VersionedParams(options, scheme.ParameterCodec).
Do().
Into(vmiList)
for _, vmi := range vmiList.Items {
vmi.SetGroupVersionKind(v1.VirtualMachineInstanceGroupVersionKind)
}
return
}
func (v *vmis) Create(vmi *v1.VirtualMachineInstance) (result *v1.VirtualMachineInstance, err error) {
result = &v1.VirtualMachineInstance{}
err = v.restClient.Post().
Namespace(v.namespace).
Resource(v.resource).
Body(vmi).
Do().
Into(result)
result.SetGroupVersionKind(v1.VirtualMachineInstanceGroupVersionKind)
return
}
func (v *vmis) Update(vmi *v1.VirtualMachineInstance) (result *v1.VirtualMachineInstance, err error) {
result = &v1.VirtualMachineInstance{}
err = v.restClient.Put().
Name(vmi.ObjectMeta.Name).
Namespace(v.namespace).
Resource(v.resource).
Body(vmi).
Do().
Into(result)
result.SetGroupVersionKind(v1.VirtualMachineInstanceGroupVersionKind)
return
}
func (v *vmis) Delete(name string, options *k8smetav1.DeleteOptions) error {
return v.restClient.Delete().
Namespace(v.namespace).
Resource(v.resource).
Name(name).
Body(options).
Do().
Error()
}
func (v *vmis) Patch(name string, pt types.PatchType, data []byte, subresources ...string) (result *v1.VirtualMachineInstance, err error) {
result = &v1.VirtualMachineInstance{}
err = v.restClient.Patch(pt).
Namespace(v.namespace).
Resource(v.resource).
SubResource(subresources...).
Name(name).
Body(data).
Do().
Into(result)
return
}