Simple chat server in go

sockchat.go

package main

import (
	"log"
	"net/http"

	"code.google.com/p/go.net/websocket"
)

type register struct {
	out   chan string
	reply chan int
}

var enter = make(chan register)
var exit = make(chan int)
var say = make(chan string)

func mindChatServer() {
	var users = make(map[int]chan string)
	var userID = 0
	for {
		select {
		case m := <-enter:
			users[userID] = m.out
			m.reply <- userID
			userID++
		case m := <-say:
			for _, user := range users {
				user <- m
			}
		case m := <-exit:
			delete(users, m)
		}
	}
}

func mindClient(ws *websocket.Conn) {
	var uidChan = make(chan int)
	var outChan = make(chan string)
	var errChan = make(chan struct{})
	enter <- register{out: outChan, reply: uidChan}
	uid := <-uidChan
	close(uidChan)
	defer func() {
		exit <- uid
		close(errChan)
	}()
	go func() {
		for {
			select {
			case m := <-outChan:
				websocket.Message.Send(ws, m)
			case <-errChan:
				close(outChan)
				return
			}
		}
	}()
	for {
		var message string
		if err := websocket.Message.Receive(ws, &message); err != nil {
			return
		}
		say <- message
	}
}

func main() {
	go mindChatServer()
	http.Handle("/", websocket.Handler(mindClient))
	if err := http.ListenAndServe(":12345", nil); err != nil {
		log.Fatal(err)
	}
}