gistfile1.go

func remoteHandler(res http.ResponseWriter, req *http.Request) {
    var err error

    //when someone requires a ws connection we create a new player and store a
    // pointer to the connection inside player.Socket
    ws, _ := websocket.Upgrade(res, req, nil, 1024, 1024)
    log.Printf("got websocket conn from %v\n", ws.RemoteAddr())
    player := new(Player)
    player.Id = uuid.New()
    player.Socket = ws

    // we broadcast the position of the new player to alredy connected
    // players (if any) and viceversa, we tell the player where to spawn already
    // existing players
    log.Println("Publishing positions")
    for _, p := range Players {
        if p.Socket.RemoteAddr() != player.Socket.RemoteAddr() {
            player.Socket.WriteJSON(p.position(true))
            p.Socket.WriteJSON(player.position(true))
        }
    }

    // we append the new player to Players slice
    Players = append(Players, player)
    for {
        // if a network error occurs (aka someone closed the game) we let
        // the other players know to despawn his sprite (Online: false) and
        // remove him from the slice so no further updates will be sent
        if err = player.Socket.ReadJSON(&player); err != nil {
            log.Println("Player Disconnected waiting", err.Error())
            for i, p := range Players {
                if p.Socket.RemoteAddr() == player.Socket.RemoteAddr() {
                    Players = append(Players[:i], Players[i+1:]...)
                } else {
                    log.Println("destroy player", player)
                    p.Socket.WriteJSON(Message{Online: false, Id: player.Id})
                }
            }
            log.Println("Number of players still connected ...", len(Players))
            return
        }

        // a regular broadcast to inform all the players about a player's
        // position update
        for _, p := range Players {
            if p.Socket.RemoteAddr() != player.Socket.RemoteAddr() {
                p.Socket.WriteJSON(player.position(false))
            }

        }
    }
}