websocket/examples/chat/hub.go

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// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
// hub maintains the set of active connections and broadcasts messages to the
// connections.
type Hub struct {
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// Registered connections.
connections map[*Conn]bool
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// Inbound messages from the connections.
broadcast chan []byte
// Register requests from the connections.
register chan *Conn
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// Unregister requests from connections.
unregister chan *Conn
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}
var hub = Hub{
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broadcast: make(chan []byte),
register: make(chan *Conn),
unregister: make(chan *Conn),
connections: make(map[*Conn]bool),
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}
func (h *Hub) run() {
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for {
select {
case conn := <-h.register:
h.connections[conn] = true
case conn := <-h.unregister:
if _, ok := h.connections[conn]; ok {
delete(h.connections, conn)
close(conn.send)
}
case message := <-h.broadcast:
for conn := range h.connections {
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select {
case conn.send <- message:
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default:
close(conn.send)
delete(hub.connections, conn)
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}
}
}
}
}