Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

logger/event_logger.go

@@ -0,0 +1,78 @@
+//go:build windows
+
+package logger
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"time"
+
+	"golang.org/x/sys/windows/svc/eventlog"
+
+	"github.com/influxdata/telegraf"
+)
+
+const (
+	eidInfo    = 1
+	eidWarning = 2
+	eidError   = 3
+)
+
+type eventLogger struct {
+	eventlog *eventlog.Log
+	errlog   *log.Logger
+}
+
+func (l *eventLogger) Close() error {
+	if l.eventlog == nil {
+		return nil
+	}
+	if err := l.eventlog.Close(); err != nil {
+		return err
+	}
+	l.eventlog = nil
+	return nil
+}
+
+func (l *eventLogger) Print(level telegraf.LogLevel, _ time.Time, prefix string, _ map[string]interface{}, args ...interface{}) {
+	// Skip debug and beyond as they cannot be logged
+	if level >= telegraf.Debug {
+		return
+	}
+
+	msg := prefix + fmt.Sprint(args...)
+
+	var err error
+	switch level {
+	case telegraf.Error:
+		err = l.eventlog.Error(eidError, msg)
+	case telegraf.Warn:
+		err = l.eventlog.Warning(eidWarning, msg)
+	case telegraf.Info:
+		err = l.eventlog.Info(eidInfo, msg)
+	}
+	if err != nil {
+		l.errlog.Printf("E! Writing log message failed: %v", err)
+	}
+
+	// TODO attributes...
+}
+
+func createEventLogger(cfg *Config) (sink, error) {
+	eventLog, err := eventlog.Open(cfg.InstanceName)
+	if err != nil {
+		return nil, err
+	}
+
+	l := &eventLogger{
+		eventlog: eventLog,
+		errlog:   log.New(os.Stderr, "", 0),
+	}
+
+	return l, nil
+}
+
+func init() {
+	add("eventlog", createEventLogger)
+}