add options for components

resolver/resolver.go

@@ -10,8 +10,12 @@ var (
 	ErrInvalid = errors.New("invalid resolver")
 )
 
+type Options struct{}
+
+type Option func(opts *Options)
+
 type Resolver interface {
 	// Resolve returns a slice of the host's IPv4 and IPv6 addresses.
 	// The network should be 'ip', 'ip4' or 'ip6', default network is 'ip'.
-	Resolve(ctx context.Context, network, host string) ([]net.IP, error)
+	Resolve(ctx context.Context, network, host string, opts ...Option) ([]net.IP, error)
 }