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/*
Copyright 2023 The KubeEdge Authors.
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.
*/
package cloudstream
import (
"context"
"errors"
"fmt"
"io"
"net"
"github.com/emicklei/go-restful"
"k8s.io/klog/v2"
"github.com/kubeedge/kubeedge/common/constants"
"github.com/kubeedge/kubeedge/pkg/stream"
)
// ContainerAttachConnection indicates the container attach request initiated by kube-apiserver
type ContainerAttachConnection struct {
MessageID uint64
ctx context.Context
r *restful.Request
Conn net.Conn
session *Session
edgePeerStop chan struct{}
closeChan chan bool
}
func (ah *ContainerAttachConnection) String() string {
return fmt.Sprintf("APIServer_AttachConnection MessageID %v", ah.MessageID)
}
func (ah *ContainerAttachConnection) WriteToAPIServer(p []byte) (n int, err error) {
return ah.Conn.Write(p)
}
func (ah *ContainerAttachConnection) SetMessageID(id uint64) {
ah.MessageID = id
}
func (ah *ContainerAttachConnection) GetMessageID() uint64 {
return ah.MessageID
}
func (ah *ContainerAttachConnection) SetEdgePeerDone() {
select {
case <-ah.closeChan:
return
case ah.EdgePeerDone() <- struct{}{}:
klog.V(6).Infof("success send channel deleting connection with messageID %v", ah.MessageID)
}
}
func (ah *ContainerAttachConnection) EdgePeerDone() chan struct{} {
return ah.edgePeerStop
}
func (ah *ContainerAttachConnection) WriteToTunnel(m *stream.Message) error {
return ah.session.WriteMessageToTunnel(m)
}
func (ah *ContainerAttachConnection) SendConnection() (stream.EdgedConnection, error) {
connector := &stream.EdgedAttachConnection{
MessID: ah.MessageID,
Method: ah.r.Request.Method,
URL: *ah.r.Request.URL,
Header: ah.r.Request.Header,
}
connector.URL.Scheme = httpScheme
connector.URL.Host = net.JoinHostPort(defaultServerHost, fmt.Sprintf("%v", constants.ServerPort))
m, err := connector.CreateConnectMessage()
if err != nil {
return nil, err
}
if err := ah.WriteToTunnel(m); err != nil {
klog.Errorf("%s failed to create attach connection: %s, err: %v", ah.String(), connector.String(), err)
return nil, err
}
return connector, nil
}
func (ah *ContainerAttachConnection) Serve() error {
defer func() {
close(ah.closeChan)
klog.V(6).Infof("%s stop successfully", ah.String())
}()
// first send connect message
connector, err := ah.SendConnection()
if err != nil {
klog.Errorf("%s send %s info error %v", ah.String(), stream.MessageTypeAttachConnect, err)
return err
}
sendCloseMessage := func() {
msg := stream.NewMessage(ah.MessageID, stream.MessageTypeRemoveConnect, nil)
for retry := 0; retry < 3; retry++ {
if err := ah.WriteToTunnel(msg); err == nil {
klog.V(6).Infof("%s send close message to edge successfully", ah.String())
return
}
klog.Warningf("%v failed send %s message to edge, err: %v", ah, msg.MessageType, err)
}
klog.Errorf("max retry count reached when send %s message to edge", msg.MessageType)
}
var data [256]byte
for {
select {
case <-ah.ctx.Done():
// if apiserver request end, send close message to edge
sendCloseMessage()
return nil
case <-ah.EdgePeerDone():
klog.V(6).Infof("%s find edge peer done, so stop this connection", ah.String())
return fmt.Errorf("%s find edge peer done, so stop this connection", ah.String())
default:
}
func() {
n, err := ah.Conn.Read(data[:])
if err != nil {
if !errors.Is(err, io.EOF) {
klog.Errorf("%s failed to read from client: %v", ah.String(), err)
return
}
klog.V(6).Infof("%s read EOF from client", ah.String())
sendCloseMessage()
return
}
if n <= 0 {
return
}
msg := stream.NewMessage(connector.GetMessageID(), stream.MessageTypeData, data[:n])
if err := ah.WriteToTunnel(msg); err != nil {
klog.Errorf("%s failed to write to tunnel server, err: %v", ah.String(), err)
return
}
}()
}
}
var _ APIServerConnection = &ContainerAttachConnection{}
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