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hub.go
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hub.go
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package main
import "log"
type Message struct {
Sender *Client
Text []byte
}
// hub maintains the set of active clients and broadcasts messages to the
// clients.
type Hub struct {
// Registered clients.
peers map[*Client]*Client
send chan *Message
// Register requests from the clients.
register chan *Client
// Unregister requests from clients.
unregister chan *Client
}
func newHub() *Hub {
return &Hub{
send: make(chan *Message),
register: make(chan *Client),
unregister: make(chan *Client),
peers: make(map[*Client]*Client),
}
}
func (h *Hub) run() {
for {
select {
case client := <-h.register:
coupled := false
for k, v := range h.peers {
if v == nil {
h.peers[k] = client
h.peers[client] = k
coupled = true
log.Println("new clients coupled!")
break
}
}
if !coupled {
h.peers[client] = nil
log.Println("registered new client")
}
case client := <-h.unregister:
_, ok := h.peers[client]
if ok {
delete(h.peers, client)
close(client.send)
}
case message := <-h.send:
log.Println("hub was requested to send a message")
peer, ok := h.peers[message.Sender]
if ok {
select {
case peer.send <- message.Text:
default:
close(peer.send)
delete(h.peers, peer)
}
}
}
}
}