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/*
Copyright 2020 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 edgestream
import (
"crypto/tls"
"fmt"
"net/http"
"net/url"
"time"
"github.com/gorilla/websocket"
"k8s.io/klog/v2"
"github.com/kubeedge/api/apis/componentconfig/edgecore/v1alpha2"
"github.com/kubeedge/beehive/pkg/core"
beehiveContext "github.com/kubeedge/beehive/pkg/core/context"
"github.com/kubeedge/kubeedge/edge/pkg/common/modules"
"github.com/kubeedge/kubeedge/edge/pkg/edgehub"
"github.com/kubeedge/kubeedge/edge/pkg/edgestream/config"
"github.com/kubeedge/kubeedge/pkg/stream"
"github.com/kubeedge/kubeedge/pkg/util"
)
type edgestream struct {
enable bool
hostnameOverride string
nodeIP string
}
var _ core.Module = (*edgestream)(nil)
func newEdgeStream(enable bool, hostnameOverride, nodeIP string) *edgestream {
return &edgestream{
enable: enable,
hostnameOverride: hostnameOverride,
nodeIP: nodeIP,
}
}
// Register register edgestream
func Register(s *v1alpha2.EdgeStream, hostnameOverride, nodeIP string) {
config.InitConfigure(s)
core.Register(newEdgeStream(s.Enable, hostnameOverride, nodeIP))
}
func (e *edgestream) Name() string {
return modules.EdgeStreamModuleName
}
func (e *edgestream) Group() string {
return modules.StreamGroup
}
func (e *edgestream) Enable() bool {
return e.enable
}
func (e *edgestream) Start() {
serverURL := url.URL{
Scheme: "wss",
Host: config.Config.TunnelServer,
Path: "/v1/kubeedge/connect",
}
// TODO: Will improve in the future
if ok := <-edgehub.GetCertSyncChannel()[e.Name()]; !ok {
klog.Exitf("Failed to find cert key pair")
}
cert, err := tls.LoadX509KeyPair(config.Config.TLSTunnelCertFile, config.Config.TLSTunnelPrivateKeyFile)
if err != nil {
klog.Exitf("Failed to load x509 key pair: %v", err)
}
tlsConfig := &tls.Config{
InsecureSkipVerify: true,
Certificates: []tls.Certificate{cert},
}
ticker := time.NewTicker(time.Second * 2)
defer ticker.Stop()
for {
select {
case <-beehiveContext.Done():
return
case <-ticker.C:
err := e.TLSClientConnect(serverURL, tlsConfig)
if err != nil {
klog.Errorf("TLSClientConnect error %v", err)
}
}
}
}
func (e *edgestream) TLSClientConnect(url url.URL, tlsConfig *tls.Config) error {
klog.Info("Start a new tunnel stream connection ...")
// If the node IP address is not specified in the configuration file,
// the node IP address is reacquired each time the tunnel stream is reconnected
var nodeIP string
if e.nodeIP == "" {
ip, err := util.GetLocalIP(util.GetHostname())
if err != nil {
return fmt.Errorf("failed to get Local IP address: %v", err)
}
klog.Infof("get node local IP address successfully: %s", ip)
nodeIP = ip
} else {
nodeIP = e.nodeIP
}
dial := websocket.Dialer{
TLSClientConfig: tlsConfig,
HandshakeTimeout: time.Duration(config.Config.HandshakeTimeout) * time.Second,
}
header := http.Header{}
header.Add(stream.SessionKeyHostNameOverride, e.hostnameOverride)
header.Add(stream.SessionKeyInternalIP, nodeIP)
con, _, err := dial.Dial(url.String(), header)
if err != nil {
klog.Errorf("dial %v error %v", url.String(), err)
return err
}
session := NewTunnelSession(con)
return session.Serve()
}
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