server/proxy/tcpproxy: reuse addr in TCPProxy.Run

"addr" is the result of net.JoinHostPort which supports IPv6 address.

Rather than ranging "tp.Endpoints" again, it's better to reuse
"addr" in the first loop to collect "eps".

See #7942 and #7943 for context.

Signed-off-by: Jes Cok <[email protected]>

Author: callthingsoff

server/proxy/tcpproxy/userspace.go

@@ -74,14 +74,12 @@ func (tp *TCPProxy) Run() error {
 	if tp.MonitorInterval == 0 {
 		tp.MonitorInterval = 5 * time.Minute
 	}
+
+	var eps []string // for logging
 	for _, srv := range tp.Endpoints {
 		addr := net.JoinHostPort(srv.Target, fmt.Sprintf("%d", srv.Port))
 		tp.remotes = append(tp.remotes, &remote{srv: srv, addr: addr})
-	}
-
-	var eps []string
-	for _, ep := range tp.Endpoints {
-		eps = append(eps, fmt.Sprintf("%s:%d", ep.Target, ep.Port))
+		eps = append(eps, addr)
 	}
 	if tp.Logger != nil {
 		tp.Logger.Info("ready to proxy client requests", zap.Strings("endpoints", eps))