/
websocket.go
135 lines (115 loc) · 3.05 KB
/
websocket.go
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/*
Copyright 2018 The KubeVirt Authors.
Copyright 2024 Flant JSC.
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.
Initially copied from https://github.com/kubevirt/kubevirt/blob/main/staging/src/kubevirt.io/client-go/kubecli/websocket.go
*/
package kubeclient
import (
"crypto/tls"
"errors"
"io"
"net/http"
"github.com/gorilla/websocket"
)
const PlainStreamProtocolName = "plain.virtualization.deckhouse.io"
const (
WebsocketMessageBufferSize = 10240
)
func NewUpgrader() *websocket.Upgrader {
return &websocket.Upgrader{
ReadBufferSize: WebsocketMessageBufferSize,
WriteBufferSize: WebsocketMessageBufferSize,
CheckOrigin: func(_ *http.Request) bool {
return true
},
Subprotocols: []string{PlainStreamProtocolName},
}
}
func Dial(address string, tlsConfig *tls.Config) (*websocket.Conn, *http.Response, error) {
dialer := &websocket.Dialer{
ReadBufferSize: WebsocketMessageBufferSize,
WriteBufferSize: WebsocketMessageBufferSize,
Subprotocols: []string{PlainStreamProtocolName},
TLSClientConfig: tlsConfig,
}
return dialer.Dial(address, nil)
}
func Copy(dst, src *websocket.Conn) (int64, error) {
return io.Copy(dst.UnderlyingConn(), src.UnderlyingConn())
}
func CopyFrom(dst io.Writer, src *websocket.Conn) (written int64, err error) {
return io.Copy(dst, &binaryReader{conn: src})
}
func CopyTo(dst *websocket.Conn, src io.Reader) (written int64, err error) {
return io.Copy(&binaryWriter{conn: dst}, src)
}
type binaryWriter struct {
conn *websocket.Conn
}
func (s *binaryWriter) Write(p []byte) (int, error) {
w, err := s.conn.NextWriter(websocket.BinaryMessage)
if err != nil {
return 0, convert(err)
}
defer w.Close()
n, err := w.Write(p)
return n, err
}
type binaryReader struct {
conn *websocket.Conn
reader io.Reader
}
func (s *binaryReader) Read(p []byte) (int, error) {
var msgType int
var err error
for {
if s.reader == nil {
msgType, s.reader, err = s.conn.NextReader()
} else {
msgType = websocket.BinaryMessage
}
if err != nil {
s.reader = nil
return 0, convert(err)
}
switch msgType {
case websocket.BinaryMessage:
n, readErr := s.reader.Read(p)
err = readErr
if err != nil {
s.reader = nil
if errors.Is(err, io.EOF) {
if n == 0 {
continue
} else {
return n, nil
}
}
}
return n, convert(err)
case websocket.CloseMessage:
return 0, io.EOF
default:
s.reader = nil
}
}
}
func convert(err error) error {
if err == nil {
return nil
}
var e *websocket.CloseError
if errors.As(err, &e) && e.Code == websocket.CloseNormalClosure {
return io.EOF
}
return err
}