AdGuardHome/syslog_windows.go

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package main
import (
"log"
"strings"
"golang.org/x/sys/windows"
"golang.org/x/sys/windows/svc/eventlog"
)
// should be the same as the service name!
const eventLogSrc = "AdGuardHome"
type eventLogWriter struct {
el *eventlog.Log
}
// Write sends a log message to the Event Log.
func (w *eventLogWriter) Write(b []byte) (int, error) {
return len(b), w.el.Info(1, string(b))
}
func configureSyslog() error {
// Continue if we receive "registry key already exists" or if we get
// ERROR_ACCESS_DENIED so that we can log without administrative permissions
// for pre-existing eventlog sources.
if err := eventlog.InstallAsEventCreate(eventLogSrc, eventlog.Info|eventlog.Warning|eventlog.Error); err != nil {
if !strings.Contains(err.Error(), "registry key already exists") && err != windows.ERROR_ACCESS_DENIED {
return err
}
}
el, err := eventlog.Open(eventLogSrc)
if err != nil {
return err
}
log.SetOutput(&eventLogWriter{el: el})
return nil
}