From cdfe26b83c6c7e7db6dfb93a33a378d4a4cbe7f3 Mon Sep 17 00:00:00 2001
From: Vladimir Mihailenco <vladimir.webdev@gmail.com>
Date: Sat, 29 Jun 2019 12:19:30 +0300
Subject: [PATCH] Use Dialer in Sentinel failover when available

---
 sentinel.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/sentinel.go b/sentinel.go
index 1f906d66..4c75de90 100644
--- a/sentinel.go
+++ b/sentinel.go
@@ -306,8 +306,9 @@ func (c *sentinelFailover) Close() error {
 
 func (c *sentinelFailover) Pool() *pool.ConnPool {
 	c.poolOnce.Do(func() {
-		c.opt.Dialer = c.dial
-		c.pool = newConnPool(c.opt)
+		opt := *c.opt
+		opt.Dialer = c.dial
+		c.pool = newConnPool(&opt)
 	})
 	return c.pool
 }
@@ -317,6 +318,9 @@ func (c *sentinelFailover) dial(ctx context.Context, network, addr string) (net.
 	if err != nil {
 		return nil, err
 	}
+	if c.opt.Dialer != nil {
+		return c.opt.Dialer(ctx, network, addr)
+	}
 	return net.DialTimeout("tcp", addr, c.opt.DialTimeout)
 }