From 2c4401db8c72b3b6b2e88df7aada2bb1d5e1bc85 Mon Sep 17 00:00:00 2001
From: Matt Jaffee <matthew.jaffee@gmail.com>
Date: Mon, 10 Dec 2018 15:48:25 -0600
Subject: [PATCH] hopefully fix data race

---
 gossip/gossip.go | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/gossip/gossip.go b/gossip/gossip.go
index 8f19203f5..491e14cf2 100644
--- a/gossip/gossip.go
+++ b/gossip/gossip.go
@@ -333,15 +333,30 @@ func newEventReceiver(logger *log.Logger, papi *pilosa.API) *eventReceiver {
 }
 
 func (g *eventReceiver) NotifyJoin(n *memberlist.Node) {
-	g.ch <- memberlist.NodeEvent{Event: memberlist.NodeJoin, Node: n}
+	// copy node to avoid data race
+	n2 := *n
+	n2.Meta = make([]byte, len(n.Meta))
+	copy(n2.Meta, n.Meta)
+
+	g.ch <- memberlist.NodeEvent{Event: memberlist.NodeJoin, Node: &n2}
 }
 
 func (g *eventReceiver) NotifyLeave(n *memberlist.Node) {
-	g.ch <- memberlist.NodeEvent{Event: memberlist.NodeLeave, Node: n}
+	// copy node to avoid data race
+	n2 := *n
+	n2.Meta = make([]byte, len(n.Meta))
+	copy(n2.Meta, n.Meta)
+
+	g.ch <- memberlist.NodeEvent{Event: memberlist.NodeLeave, Node: &n2}
 }
 
 func (g *eventReceiver) NotifyUpdate(n *memberlist.Node) {
-	g.ch <- memberlist.NodeEvent{Event: memberlist.NodeUpdate, Node: n}
+	// copy node to avoid data race
+	n2 := *n
+	n2.Meta = make([]byte, len(n.Meta))
+	copy(n2.Meta, n.Meta)
+
+	g.ch <- memberlist.NodeEvent{Event: memberlist.NodeUpdate, Node: &n2}
 }
 
 func (g *eventReceiver) listen() {