ceph-csi/vendor/k8s.io/kubernetes/pkg/windows/service/service.go

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// +build windows
/*
Copyright 2018 The Kubernetes 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 service
import (
"os"
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"k8s.io/klog"
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"golang.org/x/sys/windows"
"golang.org/x/sys/windows/svc"
)
var (
service *handler
)
type handler struct {
tosvc chan bool
fromsvc chan error
}
// InitService is the entry point for running the daemon as a Windows
// service. It returns an indication of whether it is running as a service;
// and an error.
func InitService(serviceName string) error {
h := &handler{
tosvc: make(chan bool),
fromsvc: make(chan error),
}
service = h
var err error
go func() {
err = svc.Run(serviceName, h)
h.fromsvc <- err
}()
// Wait for the first signal from the service handler.
err = <-h.fromsvc
if err != nil {
return err
}
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klog.Infof("Running %s as a Windows service!", serviceName)
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return nil
}
func (h *handler) Execute(_ []string, r <-chan svc.ChangeRequest, s chan<- svc.Status) (bool, uint32) {
s <- svc.Status{State: svc.StartPending, Accepts: 0}
// Unblock initService()
h.fromsvc <- nil
s <- svc.Status{State: svc.Running, Accepts: svc.AcceptStop | svc.AcceptShutdown | svc.Accepted(windows.SERVICE_ACCEPT_PARAMCHANGE)}
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klog.Infof("Service running")
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Loop:
for {
select {
case <-h.tosvc:
break Loop
case c := <-r:
switch c.Cmd {
case svc.Cmd(windows.SERVICE_CONTROL_PARAMCHANGE):
s <- c.CurrentStatus
case svc.Interrogate:
s <- c.CurrentStatus
case svc.Stop, svc.Shutdown:
s <- svc.Status{State: svc.Stopped}
// TODO: Stop the kubelet gracefully instead of killing the process
os.Exit(0)
}
}
}
return false, 0
}