From 201003a814d0083bb320f1bdd08a3f0ddd597e0d Mon Sep 17 00:00:00 2001
From: Bas van Beek <bas@tetrate.io>
Date: Fri, 16 Aug 2019 12:47:39 +0200
Subject: [PATCH] OT kind value can be of type string or ext.SpanKindEnum,
 allow for both to be handled properly

---
 tracer.go | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tracer.go b/tracer.go
index 0fb43b2..d37f500 100644
--- a/tracer.go
+++ b/tracer.go
@@ -82,8 +82,16 @@ func parseTagsAsZipkinOptions(t map[string]interface{}) []zipkin.SpanOption {
 	tags := map[string]string{}
 	remoteEndpoint := &model.Endpoint{}
 
+	var kind string
 	if val, ok := t[string(ext.SpanKind)]; ok {
-		kind, _ := val.(string)
+		switch kindVal := val.(type) {
+		case ext.SpanKindEnum:
+			kind = string(kindVal)
+		case string:
+			kind = kindVal
+		default:
+			kind = fmt.Sprintf("%v", kindVal)
+		}
 		zopts = append(zopts, zipkin.Kind(model.Kind(strings.ToUpper(kind))))
 	}