WebSocket server base on Go language

This is a creation in Article, where the information may have evolved or changed.

Before using the commercial server provided by pusher.com, but in my station slow, message delivery is lost, so self-framing

The main implementation of the notification function:

1. According to each page's session_id to distinguish the connection, the array way to store, should when a session opens the multiple page the case

2.json format for communication, the data specified to notify the session, all page under the session will be notified, session_id at least do MD5 processing

Package Mainimport ("Flag" "FMT" "Net/http" "Code.google.com/p/go.net/websocket") var port *in t = flag. Int ("P", 443, "Port to listen.") Create a global map that can be sess_id,value as a WS array (pointer) var Conns = make (map[string][]*websocket. Conn)//type Msg struct {//Sender string//Receiver string//Command string//Data Map (String) interface{}//}//Jsonserver echoes back JSON string sent from client using WebSocket. Json.func Server (WS *websocket. Conn) {defer ws. Close () Req: = ws. Request () req. Parseform ()//client: = req. Formvalue ("Client") sess_id: = req.        Formvalue ("sess_id"); Ver: = req.                Formvalue ("ver")//other places to initiate a notification request, processing as required//registration connection If client, OK: = conns[sess_id];!ok { CONNS[SESS_ID] = []*websocket.         CONN{WS}} else {conns[sess_id] = append (client, WS)}//ws_list, _: = conns[sess_id] WS_LIST[1] = ws//defer Delete (Conns, Sess_ID) for {//Receive receives a text message serialized T as JSON. var msg map[string]interface{} ERR: = WebSocket. Json. Receive (WS, &MSG) if err! = Nil {fmt. Println (err) break} fmt.                Printf ("recv:% #v \ n", msg)//Send send a text message serialized T as JSON. var receiver string for k,v: = Range msg {if k = = "receiver" {R Eceiver = V. (string)}} if receiver_ws_list, OK: = Conns[receiver]; OK {//fmt. Printf ("Sess client count:% #i \ n", Len (receiver_ws_list)) for _, Receiver_ws: = Range receiver_ws_l ist {err = WebSocket. Json.                                       Send (RECEIVER_WS, msg) if (err! = nil) { Fmt.                                Println ("Failed to send!") }} FMT.                Println ("sended!") } If Err! = Nil {fmt. Println (err) break} fmt.                Printf ("send:% #v \ n", msg)} my_ws_list, _: = conns[sess_id] for I, MY_WS: = Range My_ws_list {                        if My_ws = = ws {CONNS[SESS_ID] = append (My_ws_list[:i], my_ws_list[i+1:] ...) Fmt. PRINTF ("A Client Removed\n")}}//remove ws form slice FMT. PRINTF ("A client closed\n")}func Main () {flag. Parse () http. Handle ("/", WebSocket. Handler (server)) FMT. Printf ("http://localhost:%d/\n", *port) Err: = http. Listenandserve (FMT. Sprintf (":%d", *port), nil) if err! = Nil {Panic ("Listenandserve:" + Err. Error ())}}