/
hub.go
67 lines (56 loc) · 1.21 KB
/
hub.go
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package browsersync
// Hub is a client switch that broadcasts messages
type Hub struct {
// Registered clients
clients map[*Client]bool
// Broadcast a message to all registered clients
broadcast chan []byte
// Register a new client
register chan *Client
stopListening chan bool
}
// NewHub creates a new Hub
func NewHub() *Hub {
return &Hub{
clients: make(map[*Client]bool),
broadcast: make(chan []byte),
register: make(chan *Client),
stopListening: make(chan bool, 1),
}
}
func (h *Hub) stop() {
for client := range h.clients {
h.unregisterClient(client)
}
h.stopListening <- true
}
func (h *Hub) listen() {
OuterLoop:
for {
select {
case <-h.stopListening:
break OuterLoop
case client := <-h.register:
h.registerClient(client)
case message := <-h.broadcast:
h.broadcastMessage(message)
}
}
close(h.stopListening)
}
func (h *Hub) registerClient(client *Client) {
h.clients[client] = true
}
func (h *Hub) unregisterClient(client *Client) {
delete(h.clients, client)
client.close()
}
func (h *Hub) broadcastMessage(message []byte) {
for client := range h.clients {
select {
case client.outboundMessage <- message:
default:
h.unregisterClient(client)
}
}
}