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package edgehub
import (
"sync"
"time"
"k8s.io/client-go/util/flowcontrol"
"k8s.io/klog/v2"
"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/certificate"
"github.com/kubeedge/kubeedge/edge/pkg/edgehub/clients"
"github.com/kubeedge/kubeedge/edge/pkg/edgehub/config"
// register Task handler
_ "github.com/kubeedge/kubeedge/edge/pkg/edgehub/task"
"github.com/kubeedge/kubeedge/pkg/apis/componentconfig/edgecore/v1alpha2"
)
// EdgeHub defines edgehub object structure
type EdgeHub struct {
certManager certificate.CertManager
chClient clients.Adapter
reconnectChan chan struct{}
rateLimiter flowcontrol.RateLimiter
keeperLock sync.RWMutex
enable bool
}
var _ core.Module = (*EdgeHub)(nil)
var certSync map[string]chan bool
func GetCertSyncChannel() map[string]chan bool {
return certSync
}
func NewCertSyncChannel() map[string]chan bool {
certSync = make(map[string]chan bool, 2)
certSync[modules.EdgeStreamModuleName] = make(chan bool, 1)
certSync[modules.MetaManagerModuleName] = make(chan bool, 1)
return certSync
}
func newEdgeHub(enable bool) *EdgeHub {
NewCertSyncChannel()
return &EdgeHub{
enable: enable,
reconnectChan: make(chan struct{}),
rateLimiter: flowcontrol.NewTokenBucketRateLimiter(
float32(config.Config.EdgeHub.MessageQPS),
int(config.Config.EdgeHub.MessageBurst)),
}
}
// Register register edgehub
func Register(eh *v1alpha2.EdgeHub, nodeName string) {
config.InitConfigure(eh, nodeName)
core.Register(newEdgeHub(eh.Enable))
}
// Name returns the name of EdgeHub module
func (eh *EdgeHub) Name() string {
return modules.EdgeHubModuleName
}
// Group returns EdgeHub group
func (eh *EdgeHub) Group() string {
return modules.HubGroup
}
// Enable indicates whether this module is enabled
func (eh *EdgeHub) Enable() bool {
return eh.enable
}
// Start sets context and starts the controller
func (eh *EdgeHub) Start() {
eh.certManager = certificate.NewCertManager(config.Config.EdgeHub, config.Config.NodeName)
eh.certManager.Start()
for _, v := range GetCertSyncChannel() {
v <- true
close(v)
}
go eh.ifRotationDone()
for {
select {
case <-beehiveContext.Done():
klog.Warning("EdgeHub stop")
return
default:
}
err := eh.initial()
if err != nil {
klog.Exitf("failed to init controller: %v", err)
return
}
waitTime := time.Duration(config.Config.Heartbeat) * time.Second * 2
err = eh.chClient.Init()
if err != nil {
klog.Errorf("connection failed: %v, will reconnect after %s", err, waitTime.String())
time.Sleep(waitTime)
continue
}
// execute hook func after connect
eh.pubConnectInfo(true)
go eh.routeToEdge()
go eh.routeToCloud()
go eh.keepalive()
// wait the stop signal
// stop authinfo manager/websocket connection
<-eh.reconnectChan
eh.chClient.UnInit()
// execute hook fun after disconnect
eh.pubConnectInfo(false)
// sleep one period of heartbeat, then try to connect cloud hub again
klog.Warningf("connection is broken, will reconnect after %s", waitTime.String())
time.Sleep(waitTime)
// clean channel
clean:
for {
select {
case <-eh.reconnectChan:
default:
break clean
}
}
}
}
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