Functional Options

functional-options.go

package main

type Option func(*Options)

type Options struct {
	Context   context.Context
	Addrs     []string
	Timeout   time.Duration
}

func Timeout(t time.Duration) Option {
	return func(o *Options) {
		o.Timeout = t
	}
}

// Addrs is the registry addresses to use
func Addrs(addrs ...string) Option {
	return func(o *Options) {
		o.Addrs = addrs
	}
}















// NewRegistry returns a new default registry
func NewRegistry(opts ...Option) Registry {
	options := Options{
		Context: context.Background(),
		Addrs:   []string{":8080"},
		Timeout: DefaultTimeout,
	}

	for _, o := range opts {
		o(&options)
	}

	return mdnsRegistry{Options: options}
}

r := NewRegistry(
	Addrs(":8000"), 
	Timeout(10),
	//...
)