Add gokit adapter to make https toolkit work

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

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
+}