Add gokit adapter to make https toolkit work

Signed-off-by: Calle Pettersson <carlpett@users.noreply.github.com>

exporter.go

@@ -404,7 +404,7 @@ func main() {
 	go func() {
 		log.Infoln("Starting server on", *listenAddress)
 		server := &http.Server{Addr: *listenAddress}
-		if err := https.Listen(server, *httpsConfig, logger); err != nil {
+		if err := https.Listen(server, *httpsConfig, log.NewToolkitAdapter()); err != nil {
 			log.Fatalf("cannot start windows_exporter: %s", err)
 		}
 	}()

go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/Microsoft/hcsshim v0.8.6
 	github.com/StackExchange/wmi v0.0.0-20180725035823-b12b22c5341f
 	github.com/dimchansky/utfbom v1.1.0
+	github.com/go-kit/kit v0.10.0
 	github.com/go-ole/go-ole v1.2.1 // indirect
 	github.com/google/go-cmp v0.5.1 // indirect
 	github.com/leoluk/perflib_exporter v0.1.0

log/gokit_adapter.go

@@ -0,0 +1,46 @@
+package log
+
+import (
+	"github.com/go-kit/kit/log/level"
+)
+
+// Returns an adapter implementing the go-kit/kit/log.Logger interface on our
+// logrus logger
+func NewToolkitAdapter() *logAdapter {
+	return &logAdapter{}
+}
+
+type logAdapter struct{}
+
+func (*logAdapter) Log(keyvals ...interface{}) error {
+	var lvl level.Value
+	var msg string
+	for i := 0; i < len(keyvals); i += 2 {
+		switch keyvals[i] {
+		case "level":
+			tlvl, ok := keyvals[i+1].(level.Value)
+			if !ok {
+				Warnf("Could not cast level of type %T", keyvals[i+1])
+			} else {
+				lvl = tlvl
+			}
+		case "msg":
+			msg = keyvals[i+1].(string)
+		}
+	}
+
+	switch lvl {
+	case level.ErrorValue():
+		Errorln(msg)
+	case level.WarnValue():
+		Warnln(msg)
+	case level.InfoValue():
+		Infoln(msg)
+	case level.DebugValue():
+		Debugln(msg)
+	default:
+		Warnf("Unmatched log level: '%v' for message %q", lvl, msg)
+	}
+
+	return nil
+}