Created
November 22, 2011 10:44
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WebSocket server
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package main | |
import ( | |
"fmt" | |
"os" | |
"http" | |
"websocket" | |
) | |
type subscription struct { | |
conn *websocket.Conn | |
subscribe bool | |
} | |
var subscriptionChan = make(chan subscription) | |
var messageChan = make(chan []byte) | |
func clientHandler(ws *websocket.Conn) { | |
defer func() { | |
subscriptionChan <- subscription{ws, false} | |
if err := ws.Close(); err != nil { | |
fmt.Printf("clientHandler.close: %v\n", err) | |
} | |
}() | |
subscriptionChan <- subscription{ws, true} | |
for { | |
buf := make([]byte, 512) | |
n, err := ws.Read(buf) | |
if err != nil { | |
if err == os.EOF { | |
break | |
} else { | |
fmt.Printf("clientHandler.for: %v\n", err) | |
break | |
} | |
} | |
messageChan <- buf[0:n] | |
} | |
} | |
func hub() { | |
conns := make(map[*websocket.Conn]int) | |
for { | |
select { | |
case subscription := <-subscriptionChan: | |
if subscription.subscribe { | |
conns[subscription.conn] = 0 | |
} else { | |
conns[subscription.conn] = 0, false | |
} | |
case message := <-messageChan: | |
for conn, _ := range conns { | |
if _, err := conn.Write(message); err != nil { | |
conn.Close() | |
} | |
} | |
} | |
} | |
} | |
func main() { | |
go hub() | |
http.Handle("/", websocket.Handler(clientHandler)) | |
if err := http.ListenAndServe(":9999", nil); err != nil { | |
panic(err) | |
} | |
} |
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