wings/server/websockets.go

package server

import (
	"context"
	"sync"

	"github.com/google/uuid"
)

type WebsocketBag struct {
	mu    sync.Mutex
	conns map[uuid.UUID]*context.CancelFunc
}

// Returns the websocket bag which contains all of the currently open websocket connections
// for the server instance.
func (s *Server) Websockets() *WebsocketBag {
	s.wsBagLocker.Lock()
	defer s.wsBagLocker.Unlock()

	if s.wsBag == nil {
		s.wsBag = &WebsocketBag{}
	}

	return s.wsBag
}

// Adds a new websocket connection to the stack.
func (w *WebsocketBag) Push(u uuid.UUID, cancel *context.CancelFunc) {
	w.mu.Lock()
	defer w.mu.Unlock()

	if w.conns == nil {
		w.conns = make(map[uuid.UUID]*context.CancelFunc)
	}

	w.conns[u] = cancel
}

// Removes a connection from the stack.
func (w *WebsocketBag) Remove(u uuid.UUID) {
	w.mu.Lock()
	delete(w.conns, u)
	w.mu.Unlock()
}

// Cancels all of the stored cancel functions which has the effect of disconnecting
// every listening websocket for the server.
func (w *WebsocketBag) CancelAll() {
	w.mu.Lock()
	w.mu.Unlock()

	if w.conns != nil {
		for _, cancel := range w.conns {
			c := *cancel
			c()
		}
	}

	// Reset the connections.
	w.conns = make(map[uuid.UUID]*context.CancelFunc)
}