mirror of
https://github.com/prometheus-community/windows_exporter.git
synced 2026-02-15 09:26:36 +00:00
114 lines
3.0 KiB
Go
114 lines
3.0 KiB
Go
// Copyright 2024 The Prometheus 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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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// windowsservice allows us to initiate Time Sensitive components (Like registering the windows service) as early as possible in the startup process
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//go:build windows
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package windowsservice
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import (
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"fmt"
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"os"
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"golang.org/x/sys/windows"
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"golang.org/x/sys/windows/svc"
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"golang.org/x/sys/windows/svc/eventlog"
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)
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const (
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serviceName = "windows_exporter"
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)
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type windowsExporterService struct{}
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func (s *windowsExporterService) Execute(_ []string, r <-chan svc.ChangeRequest, changes chan<- svc.Status) (bool, uint32) {
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const cmdsAccepted = svc.AcceptStop | svc.AcceptShutdown
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changes <- svc.Status{State: svc.StartPending}
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changes <- svc.Status{State: svc.Running, Accepts: cmdsAccepted}
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for {
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select {
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case exitCodeCh := <-ExitCodeCh:
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changes <- svc.Status{State: svc.StopPending}
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return true, uint32(exitCodeCh)
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case c := <-r:
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switch c.Cmd {
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case svc.Interrogate:
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changes <- c.CurrentStatus
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case svc.Stop, svc.Shutdown:
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_ = logToEventToLog(windows.EVENTLOG_INFORMATION_TYPE, "service stop received")
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changes <- svc.Status{State: svc.StopPending}
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return false, 0
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default:
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_ = logToEventToLog(windows.EVENTLOG_ERROR_TYPE, fmt.Sprintf("unexpected control request #%d", c))
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}
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}
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}
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}
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var (
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IsService bool
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ExitCodeCh = make(chan int)
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StopCh = make(chan struct{})
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)
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//nolint:gochecknoinits
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func init() {
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var err error
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IsService, err = svc.IsWindowsService()
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if err != nil {
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err = logToEventToLog(windows.EVENTLOG_ERROR_TYPE, fmt.Sprintf("Failed to detect service: %v", err))
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if err != nil {
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os.Exit(2)
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}
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os.Exit(1)
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}
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if IsService {
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err = logToEventToLog(windows.EVENTLOG_INFORMATION_TYPE, "Attempting to start exporter service")
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go func() {
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err = svc.Run(serviceName, &windowsExporterService{})
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if err != nil {
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_ = logToEventToLog(windows.EVENTLOG_ERROR_TYPE, fmt.Sprintf("Failed to start service: %v", err))
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}
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StopCh <- struct{}{}
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}()
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}
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}
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func logToEventToLog(eType uint16, msg string) error {
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eventLog, err := eventlog.Open("windows_exporter")
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if err != nil {
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return fmt.Errorf("failed to open event log: %w", err)
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}
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defer func(eventLog *eventlog.Log) {
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_ = eventLog.Close()
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}(eventLog)
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p, err := windows.UTF16PtrFromString(msg)
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if err != nil {
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return fmt.Errorf("error convert string to UTF-16: %w", err)
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}
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ss := []*uint16{p, nil, nil, nil, nil, nil, nil, nil, nil}
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return windows.ReportEvent(eventLog.Handle, eType, 0, 3299, 0, 9, 0, &ss[0], nil)
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}
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