From 80378ca10dc7560c711ccd7a8b22ea0320f0965c Mon Sep 17 00:00:00 2001
From: Xudong Cai <fifsky@gmail.com>
Date: Sun, 15 Aug 2021 17:02:59 +0800
Subject: [PATCH] fix: if not kratos context then panic will result (#1338)
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* fix: if not kratos context panic

当ctx不是kratos的context，则app.Name()会导致panic
---
 middleware/tracing/metadata.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/middleware/tracing/metadata.go b/middleware/tracing/metadata.go
index ec5acb20b..7e8cbe951 100644
--- a/middleware/tracing/metadata.go
+++ b/middleware/tracing/metadata.go
@@ -17,8 +17,10 @@ var _ propagation.TextMapPropagator = Metadata{}
 
 // Inject sets metadata key-values from ctx into the carrier.
 func (b Metadata) Inject(ctx context.Context, carrier propagation.TextMapCarrier) {
-	app, _ := kratos.FromContext(ctx)
-	carrier.Set(serviceHeader, app.Name())
+	app, ok := kratos.FromContext(ctx)
+	if ok {
+		carrier.Set(serviceHeader, app.Name())
+	}
 }
 
 // Extract returns a copy of parent with the metadata from the carrier added.