rest/application/sockets.go

package application

import (
	"context"
	"log"
	"sync"
	"sync/atomic"

	"git.ali33.ru/fcg-xvii/rest"
)

type StreamStore struct {
	mu    sync.RWMutex
	items []rest.IStream
}

///////////////////////////////////////////

func NewStreamStore(stream rest.IStream) *StreamStore {
	items := []rest.IStream{}
	if stream != nil {
		items = append(items, stream)
	}
	return &StreamStore{
		items: items,
	}
}

func (s *StreamStore) add(item rest.IStream) {
	s.mu.Lock()
	s.items = append(s.items, item)
	s.mu.Unlock()
}

func (s *StreamStore) remove(item rest.IStream) int {
	s.mu.Lock()
	for i, val := range s.items {
		if val == item {
			s.items = append(s.items[:i], s.items[i+1:]...)
			break
		}
	}
	res := len(s.items)
	s.mu.Unlock()
	return res

}

func (s *StreamStore) get(index int) (res rest.IStream) {
	s.mu.RLock()
	if index >= 0 && index < len(s.items) {
		res = s.items[index]
	}
	s.mu.RUnlock()
	return res
}

func (s *StreamStore) Size() int {
	s.mu.RLock()
	res := len(s.items)
	s.mu.RUnlock()
	return res
}

func (s *StreamStore) SendMessage(message rest.IRequestOut) {
	s.mu.RLock()
	for _, val := range s.items {
		val.SendMessage(message)
	}
	s.mu.RUnlock()
}

////////////////////////////////////////////////////////////

func NewSockets() *Sockets {
	res := &Sockets{
		counter:   &atomic.Int64{},
		chConnect: make(chan rest.IStream, 5),
		clients:   &sync.Map{},
	}
	go res.work()
	return res
}

type Sockets struct {
	ctx       context.Context
	cancel    context.CancelFunc
	counter   *atomic.Int64
	chConnect chan rest.IStream
	clients   *sync.Map
}

func (s *Sockets) work() {
	s.ctx, s.cancel = context.WithCancel(context.Background())
	for {
		select {
		case <-s.ctx.Done():
			return
		case stream := <-s.chConnect:
			log.Println("CONNECT-------", s.counter.Add(1))
			go func() {
				<-stream.Context().Done()
				log.Println("DISCONNECT-------", s.counter.Add(-1))
				// auth
				auth := stream.Auth()
				if auth != nil {
					id := auth.Int32("id", 0)
					iStore, ok := s.clients.Load(id)
					if ok {
						store := iStore.(*StreamStore)
						if store.remove(stream) == 0 {
							s.clients.Delete(id)
						}
					}
				}
			}()
		}
	}
}

func (s *Sockets) Connect() chan<- rest.IStream {
	return s.chConnect
}

func (s *Sockets) OnlineCount() int64 {
	return s.counter.Load()
}

func (s *Sockets) ClientAuth(id any, stream rest.IStream) {
	store, exists := s.clients.LoadOrStore(id, NewStreamStore(stream))
	if exists {
		store.(*StreamStore).add(stream)
	}
}

func (s *Sockets) ClientExists(id any) bool {
	_, exists := s.clients.Load(id)
	return exists
}

func (s *Sockets) SendMessage(id any, message rest.IRequestOut) {
	store, exists := s.clients.Load(id)
	if exists {
		store.(*StreamStore).SendMessage(message)
	}
}