chore: add short circuit logic for dual stack dial to decrease unnecessary goroutine

Author: wwqgtxx

component/dialer/dialer.go

@@ -209,6 +209,12 @@ func dualStackDialContext(ctx context.Context, dialFn dialFunc, network string,
 	if len(ipv4s) == 0 && len(ipv6s) == 0 {
 		return nil, ErrorNoIpAddress
 	}
+	if len(ipv4s) == 0 && len(ipv6s) != 0 {
+		return dialFn(ctx, network, ipv6s, port, opt)
+	}
+	if len(ipv4s) != 0 && len(ipv6s) == 0 {
+		return dialFn(ctx, network, ipv4s, port, opt)
+	}
 
 	preferIPVersion := opt.prefer
 	fallbackTicker := time.NewTicker(dualStackFallbackTimeout)
@@ -289,6 +295,9 @@ func parallelDialContext(ctx context.Context, network string, ips []netip.Addr,
 	if len(ips) == 0 {
 		return nil, ErrorNoIpAddress
 	}
+	if len(ips) == 1 {
+		return dialContext(ctx, network, ips[0], port, opt)
+	}
 	results := make(chan dialResult)
 	returned := make(chan struct{})
 	defer close(returned)