From 66e18261160f1363f097a42df1248f95a11b0443 Mon Sep 17 00:00:00 2001
From: Jeromy <jeromyj@gmail.com>
Date: Wed, 8 Feb 2017 22:36:40 -0800
Subject: [PATCH] Add in env var to enable yamux debug logging

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>
---
 core/core.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/core/core.go b/core/core.go
index 408f20b124d..c1296d5cae2 100644
--- a/core/core.go
+++ b/core/core.go
@@ -234,6 +234,10 @@ func makeSmuxTransport(mplexExp bool) smux.Transport {
 		LogOutput:              ioutil.Discard,
 	}
 
+	if os.Getenv("YAMUX_DEBUG") != "" {
+		ymxtpt.LogOutput = os.Stderr
+	}
+
 	mstpt.AddTransport("/yamux/1.0.0", ymxtpt)
 
 	mstpt.AddTransport("/spdy/3.1.0", spdy.Transport)