From 2a69aaf976f4e4606702fdd27f40992a758b1938 Mon Sep 17 00:00:00 2001
From: Evgenii Stratonikov <evgeniy@nspcc.ru>
Date: Mon, 21 Mar 2022 15:07:55 +0300
Subject: [PATCH] [#1157] network/cache: Optimize `client` fetch from
 `multiClient`

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
---
 pkg/network/cache/multi.go | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/pkg/network/cache/multi.go b/pkg/network/cache/multi.go
index bb36b2ab7..da9aa3927 100644
--- a/pkg/network/cache/multi.go
+++ b/pkg/network/cache/multi.go
@@ -235,16 +235,21 @@ func (x *multiClient) RawForAddress(addr network.Address, f func(client *rawclie
 }
 
 func (x *multiClient) client(addr network.Address) clientcore.Client {
-	x.mtx.Lock()
-
 	strAddr := addr.String()
 
+	x.mtx.RLock()
 	c, cached := x.clients[strAddr]
-	if !cached {
-		c = x.createForAddress(addr)
-	}
+	x.mtx.RUnlock()
 
-	x.mtx.Unlock()
+	if !cached {
+		x.mtx.Lock()
+
+		c, cached = x.clients[strAddr]
+		if !cached {
+			c = x.createForAddress(addr)
+		}
+		x.mtx.Unlock()
+	}
 
 	return c
 }