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116 lines
3.4 KiB
Go
116 lines
3.4 KiB
Go
// +build windows
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/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package service
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import (
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"os"
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"time"
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"k8s.io/apiserver/pkg/server"
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"k8s.io/klog/v2"
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"golang.org/x/sys/windows"
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"golang.org/x/sys/windows/svc"
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)
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var (
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service *handler
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)
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type handler struct {
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tosvc chan bool
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fromsvc chan error
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}
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// InitService is the entry point for running the daemon as a Windows
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// service. It returns an indication of whether it is running as a service;
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// and an error.
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func InitService(serviceName string) error {
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h := &handler{
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tosvc: make(chan bool),
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fromsvc: make(chan error),
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}
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service = h
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var err error
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go func() {
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err = svc.Run(serviceName, h)
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h.fromsvc <- err
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}()
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// Wait for the first signal from the service handler.
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err = <-h.fromsvc
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if err != nil {
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return err
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}
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klog.Infof("Running %s as a Windows service!", serviceName)
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return nil
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}
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func (h *handler) Execute(_ []string, r <-chan svc.ChangeRequest, s chan<- svc.Status) (bool, uint32) {
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s <- svc.Status{State: svc.StartPending, Accepts: 0}
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// Unblock initService()
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h.fromsvc <- nil
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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:
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for {
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select {
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case <-h.tosvc:
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break Loop
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case c := <-r:
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switch c.Cmd {
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case svc.Cmd(windows.SERVICE_CONTROL_PARAMCHANGE):
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s <- c.CurrentStatus
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case svc.Interrogate:
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s <- c.CurrentStatus
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case svc.Stop, svc.Shutdown:
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klog.Infof("Service stopping")
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// We need to translate this request into a signal that can be handled by the signal handler
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// handling shutdowns normally (currently apiserver/pkg/server/signal.go).
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// If we do not do this, our main threads won't be notified of the upcoming shutdown.
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// Since Windows services do not use any console, we cannot simply generate a CTRL_BREAK_EVENT
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// but need a dedicated notification mechanism.
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graceful := server.RequestShutdown()
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// Free up the control handler and let us terminate as gracefully as possible.
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// If that takes too long, the service controller will kill the remaining threads.
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// As per https://docs.microsoft.com/en-us/windows/desktop/services/service-control-handler-function
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s <- svc.Status{State: svc.StopPending}
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// If we cannot exit gracefully, we really only can exit our process, so atleast the
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// service manager will think that we gracefully exited. At the time of writing this comment this is
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// needed for applications that do not use signals (e.g. kube-proxy)
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if !graceful {
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go func() {
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// Ensure the SCM was notified (The operation above (send to s) was received and communicated to the
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// service control manager - so it doesn't look like the service crashes)
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time.Sleep(1 * time.Second)
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os.Exit(0)
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}()
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}
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break Loop
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}
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}
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}
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return false, 0
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}
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