fix: race slice for list function of ring client (#2931)

* fix: race slice for list of ring client

Signed-off-by: rfyiamcool <[email protected]>

* fix: copy wrong list

Co-authored-by: Nedyalko Dyakov <[email protected]>

---------

Signed-off-by: rfyiamcool <[email protected]>
Co-authored-by: ofekshenawa <[email protected]>
Co-authored-by: Nedyalko Dyakov <[email protected]>

Author: 3 people

ring.go

@@ -341,7 +341,8 @@ func (c *ringSharding) List() []*ringShard {
 
 	c.mu.RLock()
 	if !c.closed {
-		list = c.shards.list
+		list = make([]*ringShard, len(c.shards.list))
+		copy(list, c.shards.list)
 	}
 	c.mu.RUnlock()