/
tunnel.go
141 lines (123 loc) · 3 KB
/
tunnel.go
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package kubeagent
import (
"crypto/tls"
"encoding/json"
"github.com/gorilla/websocket"
"k8s.io/klog/v2"
"net/http"
"net/url"
"time"
)
const (
TunnelConnectPath = "/api/v1/cluster/agent/connect"
TunnelResponsePath = "/api/v1/cluster/agent/response"
)
type TunnelCallback interface {
OnSuccess()
}
type ConnectOnSuccess func()
type Tunnel interface {
Run(stopCh <-chan struct{})
Receive() <-chan []byte
Send(interface{})
}
type tunnel struct {
token string
connUrl *url.URL
respUrl *url.URL
wsConn *websocket.Conn
receiveChan chan []byte
callback TunnelCallback
stopped bool
}
func NewTunnel(token string, serverHost string, callback TunnelCallback) Tunnel {
return &tunnel{
token: token,
connUrl: &url.URL{Scheme: "ws", Host: serverHost, Path: TunnelConnectPath},
respUrl: &url.URL{Scheme: "ws", Host: serverHost, Path: TunnelResponsePath},
callback: callback,
receiveChan: make(chan []byte),
}
}
func (t *tunnel) Run(stopCh <-chan struct{}) {
go func() {
select {
case <-stopCh:
t.stopped = true
if t.wsConn != nil {
t.wsConn.Close()
}
}
}()
defer t.wsConn.Close()
t.connect()
for {
_, data, err := t.wsConn.ReadMessage()
if t.stopped {
return
}
if err != nil {
klog.Error("read err:", err)
t.wsConn.Close()
t.connect()
continue
}
t.receiveChan <- data
}
}
func (t *tunnel) Receive() <-chan []byte {
return t.receiveChan
}
func (t *tunnel) Send(obj interface{}) {
respMsg, err := json.Marshal(obj)
if err != nil {
klog.Errorf("response %v serializer error: %s", obj, err)
return
}
klog.V(1).Info("start connect to server response websocket", t.connUrl.String())
wsHeader := http.Header{}
wsHeader.Add("token", t.token)
d := &websocket.Dialer{TLSClientConfig: &tls.Config{RootCAs: nil, InsecureSkipVerify: true}}
conn, _, err := d.Dial(t.respUrl.String(), wsHeader)
if err != nil {
klog.Errorf("connect to server %s error: %v", t.respUrl.String(), err)
}
defer conn.Close()
if err = conn.WriteMessage(websocket.TextMessage, respMsg); err != nil {
klog.Errorf("write message error: message=%s, error=%s", respMsg, err.Error())
return
}
klog.V(1).Infof("write response %s success", string(respMsg))
}
func (t *tunnel) connect() {
err := t.connectServer()
if err == nil {
return
}
ticker := time.NewTicker(time.Second * 5)
defer ticker.Stop()
for {
select {
case <-ticker.C:
err := t.connectServer()
if err == nil {
return
}
}
}
}
func (t *tunnel) connectServer() error {
klog.Info("start connect to server ", t.connUrl.String())
wsHeader := http.Header{}
wsHeader.Add("token", t.token)
d := &websocket.Dialer{TLSClientConfig: &tls.Config{RootCAs: nil, InsecureSkipVerify: true}}
conn, _, err := d.Dial(t.connUrl.String(), wsHeader)
if err != nil {
klog.Infof("connect to server %s error: %v, retry after 5 seconds\n", t.connUrl.String(), err)
return err
} else {
klog.Infof("connect to server %s success\n", t.connUrl.String())
t.wsConn = conn
return nil
}
}