forked from kubeedge/kubeedge
/
eventhandler.go
286 lines (256 loc) · 8.58 KB
/
eventhandler.go
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package handler
import (
"encoding/json"
"fmt"
"strings"
"sync"
"time"
bhLog "github.com/kubeedge/beehive/pkg/common/log"
"github.com/kubeedge/beehive/pkg/core/context"
"github.com/kubeedge/beehive/pkg/core/model"
"github.com/kubeedge/kubeedge/cloud/pkg/cloudhub/channelq"
hubio "github.com/kubeedge/kubeedge/cloud/pkg/cloudhub/common/io"
emodel "github.com/kubeedge/kubeedge/cloud/pkg/cloudhub/common/model"
)
// ExitCode exit code
type ExitCode int
const (
hubioReadFail ExitCode = iota
hubioWriteFail
eventQueueDisconnect
nodeStop
)
// constants for error message
const (
MsgFormatError = "message format not correct"
)
// EventHandle processes events between cloud and edge
type EventHandle struct {
KeepaliveInterval int
WriteTimeout int
Nodes sync.Map
nodeConns sync.Map
nodeLocks sync.Map
EventQueue *channelq.ChannelEventQueue
Context *context.Context
Handlers []HandleFunc
}
type HandleFunc func(hi hubio.CloudHubIO, info *emodel.HubInfo, stop chan ExitCode)
func dumpEventMetadata(event *emodel.Event) string {
return fmt.Sprintf("id: %s, parent_id: %s, group: %s, source: %s, resource: %s, operation: %s",
event.ID, event.ParentID, event.Group, event.Source, event.UserGroup.Resource, event.UserGroup.Operation)
}
func trimMessage(msg *model.Message) {
resource := msg.GetResource()
if strings.HasPrefix(resource, emodel.ResNode) {
tokens := strings.Split(resource, "/")
if len(tokens) < 3 {
bhLog.LOGGER.Warnf("event resource %s starts with node but length less than 3", resource)
} else {
msg.SetResourceOperation(strings.Join(tokens[2:], "/"), msg.GetOperation())
}
}
}
func notifyEventQueueError(hi hubio.CloudHubIO, code ExitCode, nodeID string) {
if code == eventQueueDisconnect {
msg := model.NewMessage("").BuildRouter(emodel.GpResource, emodel.SrcCloudHub, emodel.NewResource(emodel.ResNode, nodeID, nil), emodel.OpDisConnect)
err := hi.WriteData(msg)
if err != nil {
bhLog.LOGGER.Errorf("fail to notify node %s event queue disconnected, reason: %s", nodeID, err.Error())
}
}
}
func constructConnectEvent(info *emodel.HubInfo, isConnected bool) *emodel.Event {
connected := emodel.OpConnect
if !isConnected {
connected = emodel.OpDisConnect
}
body := map[string]interface{}{
"event_type": connected,
"timestamp": time.Now().Unix(),
"client_id": info.NodeID}
content, _ := json.Marshal(body)
msg := model.NewMessage("")
return &emodel.Event{
Group: emodel.GpResource,
Source: emodel.SrcCloudHub,
UserGroup: emodel.UserGroupInfo{
Resource: emodel.NewResource(emodel.ResNode, info.NodeID, nil),
Operation: connected,
},
ID: msg.GetID(),
ParentID: msg.GetParentID(),
Timestamp: msg.GetTimestamp(),
Content: string(content),
}
}
func (eh *EventHandle) Pub2Controller(info *emodel.HubInfo, msg *model.Message) error {
if msg.GetOperation() == emodel.OpKeepalive {
bhLog.LOGGER.Infof("Keepalive message received from node: %s", info.NodeID)
return nil
}
msg.SetResourceOperation(fmt.Sprintf("node/%s/%s", info.NodeID, msg.GetResource()), msg.GetOperation())
event := emodel.MessageToEvent(msg)
bhLog.LOGGER.Infof("event received for node %s %s, content: %s", info.NodeID, dumpEventMetadata(&event), event.Content)
if event.IsFromEdge() {
err := eh.EventQueue.Publish(info, &event)
if err != nil {
// content is not logged since it may contain sensitive information
bhLog.LOGGER.Errorf("fail to publish event for node %s, %s, reason: %s",
info.NodeID, dumpEventMetadata(&event), err.Error())
return err
}
}
return nil
}
func (eh *EventHandle) handleNodeQuery(info *emodel.HubInfo, event *emodel.Event) (bool, error) {
if event.UserGroup.Operation != "request_exist" {
return false, nil
}
msg := model.NewMessage(event.ID)
event.ID = msg.GetID()
event.ParentID = msg.GetParentID()
event.Timestamp = msg.GetTimestamp()
event.UserGroup.Operation = "response_exist"
return true, eh.EventQueue.Publish(info, event)
}
func (eh *EventHandle) hubIoWrite(hi hubio.CloudHubIO, nodeID string, v interface{}) error {
value, ok := eh.nodeLocks.Load(nodeID)
if !ok {
return fmt.Errorf("node disconnected")
}
mutex := value.(*sync.Mutex)
mutex.Lock()
defer mutex.Unlock()
return hi.WriteData(v)
}
// ServeConn starts serving the incoming connection
func (eh *EventHandle) ServeConn(hi hubio.CloudHubIO, info *emodel.HubInfo) {
err := eh.EnrollNode(hi, info)
if err != nil {
bhLog.LOGGER.Errorf("fail to enroll node %s, reason %s", info.NodeID, err.Error())
return
}
bhLog.LOGGER.Infof("edge node %s for project %s connected", info.NodeID, info.ProjectID)
stop := make(chan ExitCode, 2)
for _, handle := range eh.Handlers {
go handle(hi, info, stop)
}
code := <-stop
eh.CancelNode(hi, info, code)
}
// EnrollNode enroll node for the incoming connection
func (eh *EventHandle) EnrollNode(hi hubio.CloudHubIO, info *emodel.HubInfo) error {
err := eh.EventQueue.Connect(info)
if err != nil {
bhLog.LOGGER.Errorf("fail to connect to event queue for node %s, reason %s", info.NodeID, err.Error())
notifyEventQueueError(hi, eventQueueDisconnect, info.NodeID)
err = hi.Close()
if err != nil {
bhLog.LOGGER.Errorf("fail to close connection, reason: %s", err.Error())
}
return err
}
err = eh.EventQueue.Publish(info, constructConnectEvent(info, true))
if err != nil {
bhLog.LOGGER.Errorf("fail to publish node connect event for node %s, reason %s", info.NodeID, err.Error())
notifyEventQueueError(hi, eventQueueDisconnect, info.NodeID)
err = hi.Close()
if err != nil {
bhLog.LOGGER.Errorf("fail to close connection, reason: %s", err.Error())
}
eh.EventQueue.Close(info)
return err
}
eh.nodeConns.Store(info.NodeID, hi)
eh.nodeLocks.Store(info.NodeID, &sync.Mutex{})
eh.Nodes.Store(info.NodeID, true)
return nil
}
func (eh *EventHandle) CancelNode(hi hubio.CloudHubIO, info *emodel.HubInfo, code ExitCode) {
eh.nodeLocks.Delete(info.NodeID)
eh.nodeConns.Delete(info.NodeID)
err := eh.EventQueue.Publish(info, constructConnectEvent(info, false))
if err != nil {
bhLog.LOGGER.Errorf("fail to publish node disconnect event for node %s, reason %s", info.NodeID, err.Error())
}
notifyEventQueueError(hi, code, info.NodeID)
eh.Nodes.Delete(info.NodeID)
err = hi.Close()
if err != nil {
bhLog.LOGGER.Errorf("fail to close connection, reason: %s", err.Error())
}
eh.EventQueue.Close(info)
}
// GetNodeCount returns the number of connected Nodes
func (eh *EventHandle) GetNodeCount() int {
var num int
iter := func(key, value interface{}) bool {
num++
return true
}
eh.Nodes.Range(iter)
return num
}
// GetWorkload returns the workload of the event queue
func (eh *EventHandle) GetWorkload() (float64, error) {
return eh.EventQueue.Workload()
}
// EventWriteLoop processes all write requests
func (eh *EventHandle) eventWriteLoop(hi hubio.CloudHubIO, info *emodel.HubInfo, stop chan ExitCode) {
events, err := eh.EventQueue.Consume(info)
if err != nil {
bhLog.LOGGER.Errorf("failed to consume event for node %s, reason: %s", info.NodeID, err.Error())
stop <- eventQueueDisconnect
return
}
for {
event, err := events.Get()
if err != nil {
bhLog.LOGGER.Errorf("failed to consume event for node %s, reason: %s", info.NodeID, err.Error())
if err.Error() == MsgFormatError {
// error format message should not impact other message
events.Ack()
continue
}
stop <- eventQueueDisconnect
return
}
isQuery, err := eh.handleNodeQuery(info, event)
if err != nil {
bhLog.LOGGER.Errorf("failed to process node query event for node %s, reason %s", info.NodeID, err.Error())
}
if isQuery {
events.Ack()
continue
}
if event.IsNodeStopped() {
bhLog.LOGGER.Infof("node %s is stopped, will disconnect", info.NodeID)
events.Ack()
stop <- nodeStop
return
}
if !event.IsToEdge() {
bhLog.LOGGER.Infof("skip only to cloud event for node %s, %s, content %s", info.NodeID, dumpEventMetadata(event), event.Content)
events.Ack()
continue
}
bhLog.LOGGER.Infof("event to send for node %s, %s, content %s", info.NodeID, dumpEventMetadata(event), event.Content)
msg := emodel.EventToMessage(event)
trimMessage(&msg)
err = hi.SetWriteDeadline(time.Now().Add(time.Duration(eh.WriteTimeout) * time.Second))
if err != nil {
bhLog.LOGGER.Errorf("SetWriteDeadline error, %s", err.Error())
stop <- hubioWriteFail
return
}
err = eh.hubIoWrite(hi, info.NodeID, &msg)
if err != nil {
bhLog.LOGGER.Errorf("write error, connection for node %s will be closed, affected event %s, reason %s",
info.NodeID, dumpEventMetadata(event), err.Error())
stop <- hubioWriteFail
return
}
events.Ack()
}
}