package pubsub
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import (
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"errors"
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"sync"
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"time"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/signal/done"
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"github.com/v2fly/v2ray-core/v5/common/task"
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)
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type Subscriber struct {
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buffer chan interface{}
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done *done.Instance
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}
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func (s *Subscriber) push(msg interface{}) {
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select {
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case s.buffer <- msg:
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default:
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}
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}
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func (s *Subscriber) Wait() <-chan interface{} {
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return s.buffer
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}
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func (s *Subscriber) Close() error {
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return s.done.Close()
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}
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func (s *Subscriber) IsClosed() bool {
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return s.done.Done()
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}
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type Service struct {
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sync.RWMutex
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subs map[string][]*Subscriber
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ctask *task.Periodic
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}
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func NewService() *Service {
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s := &Service{
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subs: make(map[string][]*Subscriber),
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}
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s.ctask = &task.Periodic{
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Execute: s.Cleanup,
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Interval: time.Second * 30,
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}
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return s
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}
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// Cleanup cleans up internal caches of subscribers.
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// Visible for testing only.
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func (s *Service) Cleanup() error {
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s.Lock()
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defer s.Unlock()
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if len(s.subs) == 0 {
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return errors.New("nothing to do")
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}
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for name, subs := range s.subs {
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newSub := make([]*Subscriber, 0, len(s.subs))
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for _, sub := range subs {
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if !sub.IsClosed() {
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newSub = append(newSub, sub)
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}
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}
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if len(newSub) == 0 {
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delete(s.subs, name)
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} else {
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s.subs[name] = newSub
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}
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}
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if len(s.subs) == 0 {
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s.subs = make(map[string][]*Subscriber)
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}
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return nil
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}
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func (s *Service) Subscribe(name string) *Subscriber {
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sub := &Subscriber{
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buffer: make(chan interface{}, 16),
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done: done.New(),
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}
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s.Lock()
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s.subs[name] = append(s.subs[name], sub)
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s.Unlock()
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common.Must(s.ctask.Start())
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return sub
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}
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func (s *Service) Publish(name string, message interface{}) {
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s.RLock()
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defer s.RUnlock()
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for _, sub := range s.subs[name] {
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if !sub.IsClosed() {
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sub.push(message)
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}
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}
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}
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