From ebdc873e478fe6bd67256d4fa31746bc382d3117 Mon Sep 17 00:00:00 2001
From: Alex Dadgar <alex.dadgar@gmail.com>
Date: Mon, 18 Apr 2016 11:46:57 -0700
Subject: [PATCH] protect writing to closed channel

---
 client/driver/logging/rotator.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/client/driver/logging/rotator.go b/client/driver/logging/rotator.go
index 5606d600f..5cf200ee2 100644
--- a/client/driver/logging/rotator.go
+++ b/client/driver/logging/rotator.go
@@ -130,7 +130,9 @@ func (f *FileRotator) nextFile() error {
 		break
 	}
 	// Purge old files if we have more files than MaxFiles
-	if f.logFileIdx-f.oldestLogFileIdx >= f.MaxFiles {
+	f.closedLock.Lock()
+	defer f.closedLock.Unlock()
+	if f.logFileIdx-f.oldestLogFileIdx >= f.MaxFiles && !f.closed {
 		select {
 		case f.purgeCh <- struct{}{}:
 		default: