chore: Remove registry based perfdata collector (#1742)

Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

internal/windowsservice/windowsservice.go

@@ -0,0 +1,100 @@
+// windowsservice allows us to initiate Time Sensitive components (Like registering the windows service) as early as possible in the startup process
+//go:build windows
+
+package windowsservice
+
+import (
+	"fmt"
+	"os"
+
+	"golang.org/x/sys/windows"
+	"golang.org/x/sys/windows/svc"
+	"golang.org/x/sys/windows/svc/eventlog"
+)
+
+const (
+	serviceName = "windows_exporter"
+)
+
+type windowsExporterService struct{}
+
+func (s *windowsExporterService) Execute(_ []string, r <-chan svc.ChangeRequest, changes chan<- svc.Status) (bool, uint32) {
+	const cmdsAccepted = svc.AcceptStop | svc.AcceptShutdown
+	changes <- svc.Status{State: svc.StartPending}
+	changes <- svc.Status{State: svc.Running, Accepts: cmdsAccepted}
+
+	for {
+		select {
+		case exitCodeCh := <-ExitCodeCh:
+			changes <- svc.Status{State: svc.StopPending}
+
+			return true, uint32(exitCodeCh)
+		case c := <-r:
+			switch c.Cmd {
+			case svc.Interrogate:
+				changes <- c.CurrentStatus
+			case svc.Stop, svc.Shutdown:
+				_ = logToEventToLog(windows.EVENTLOG_INFORMATION_TYPE, "service stop received")
+
+				changes <- svc.Status{State: svc.StopPending}
+
+				return false, 0
+			default:
+				_ = logToEventToLog(windows.EVENTLOG_ERROR_TYPE, fmt.Sprintf("unexpected control request #%d", c))
+			}
+		}
+	}
+}
+
+var (
+	IsService  bool
+	ExitCodeCh = make(chan int)
+	StopCh     = make(chan struct{})
+)
+
+//nolint:gochecknoinits
+func init() {
+	var err error
+
+	IsService, err = svc.IsWindowsService()
+	if err != nil {
+		err = logToEventToLog(windows.EVENTLOG_ERROR_TYPE, fmt.Sprintf("Failed to detect service: %v", err))
+		if err != nil {
+			os.Exit(2)
+		}
+
+		os.Exit(1)
+	}
+
+	if IsService {
+		err = logToEventToLog(windows.EVENTLOG_INFORMATION_TYPE, "Attempting to start exporter service")
+
+		go func() {
+			err = svc.Run(serviceName, &windowsExporterService{})
+			if err != nil {
+				_ = logToEventToLog(windows.EVENTLOG_ERROR_TYPE, fmt.Sprintf("Failed to start service: %v", err))
+			}
+
+			StopCh <- struct{}{}
+		}()
+	}
+}
+
+func logToEventToLog(eType uint16, msg string) error {
+	eventLog, err := eventlog.Open("windows_exporter")
+	if err != nil {
+		return fmt.Errorf("failed to open event log: %w", err)
+	}
+	defer func(eventLog *eventlog.Log) {
+		_ = eventLog.Close()
+	}(eventLog)
+
+	p, err := windows.UTF16PtrFromString(msg)
+	if err != nil {
+		return fmt.Errorf("error convert string to UTF-16: %w", err)
+	}
+
+	ss := []*uint16{p, nil, nil, nil, nil, nil, nil, nil, nil}
+
+	return windows.ReportEvent(eventLog.Handle, eType, 0, 3299, 0, 9, 0, &ss[0], nil)
+}