Friday, August 12, 2016

Part 5: Multiplayer WebSocket Game server written in C using libuv & libwebsockets & Cocos2d-x-HTML5

The Web Sockets Class is the class where the Requests / Responses are happening.
It using the native HTML5 Web Sockets interface / API .
All requests will process through this class and all response will process through this class also
All web-sockets validations / and function dispatching will also triggered from here .

Websockts.js
 
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var WebSocket = WebSocket || window.WebSocket || window.MozWebSocket; 

var MsgProtocolContainer =  function() 
{
 this.msgProtocol = new MsgProtocol();
 this.msgProtocolGems = new MsgProtocol();
}
var WebSocketNode = cc.Node.extend({
     m_wsiSendBinary:null,
     m_loginObj:null,
     m_GameLayer:null,
     m_msgProtocolContainer:null,
     ctor:function () {
         this._super(); 
         this.winsize = cc.winSize;
         this.m_msgProtocolContainer = new MsgProtocolContainer();        
     },
     init: function () {
        this.m_wsiSendBinary = new WebSocket("ws://127.0.0.1:7681/wsapi");
        this.m_wsiSendBinary.binaryType = "arraybuffer";
        this.m_wsiSendBinary.onopen = function(evt) {
            cc.log("Send Binary WS was opened.");
        };

        this.m_wsiSendBinary.onmessage = (function(evt) {
      var binaryUint8 = new Uint8Array(evt.data);
      var binaryStr = '';
      for (var i = 0; i < binaryUint8.length; i++) {
           binaryStr += String.fromCharCode(binaryUint8[i]);
      }
            // cc.log(binaryStr);
             this.handleServerResponse(binaryStr);


         this.m_wsiSendBinary.onerror = function(evt) {
             //this.m_loginObj.serverofflineLabel = 180;
            cc.log("m_wsiSendBinary Error was fired");
             if (cc.sys.isObjectValid(self)) {
                //self._errorStatus.setString("an error was fired");
                cc.log("an error was fired");
            } else {
                cc.log("WebSocket test layer was destroyed!");
            }
        };

        this.m_wsiSendBinary.onclose = function(evt) {
            cc.log("m_wsiSendBinary websocket instance closed.");
            self.m_wsiSendBinary = null;
        };
            
        }).bind(this);

       
         return true;
     },
     getMsgProtocol:function()
     {
      return this.m_msgProtocolContainer;
     },
     handleServerResponse:function(binaryStr)
     {
    var ResponseFromServer = Decode(binaryStr);
     
    //cc.log(Encode(ResponseFromServer));
     switch(ResponseFromServer.status)
     {
      case 1:
      {
       //cc.log(ResponseFromServer.player_id);
       this.m_msgProtocolContainer.msgProtocol.player_id = ResponseFromServer.player_id;
       if(ResponseFromServer.hasOwnProperty("players"))
       {
        this.m_msgProtocolContainer.msgProtocol.players = ResponseFromServer.players;
       }
       this.m_loginObj.switchToGame();
       break;
      }
      case 3:
      {
       this.m_GameLayer.syncPlayerActions(ResponseFromServer);
       break;
      }
      case 4:
      {
       this.m_GameLayer.AddOtherPlayerOnRegister(ResponseFromServer);
       break;
      } 
      case 5:
      {
       this.m_GameLayer.updateOtherPlayerOnMovment(ResponseFromServer);
       break;
      } 
      case 6:
      {
       this.m_GameLayer.deletePlayer(ResponseFromServer);
       break;
      } 
      case 7:
      {
       this.m_msgProtocolContainer.msgProtocolGems.simple_gems = ResponseFromServer.simple_gems;
       this.m_msgProtocolContainer.msgProtocolGems.bomb_gems = ResponseFromServer.bomb_gems;
       this.m_msgProtocolContainer.msgProtocolGems.status = ResponseFromServer.status;
       this.m_msgProtocolContainer.msgProtocolGems.player_id = ResponseFromServer.player_id;
       this.m_msgProtocolContainer.msgProtocolGems.utc_timestemp = ResponseFromServer.utc_timestemp;
       break;
      }       
     }
     
     },
     _stringConvertToArray:function (strData) {
         if (!strData)
         {
             return null;
         }

         var arrData = new Uint16Array(strData.length);
         for (var i = 0; i < strData.length; i++) {
             arrData[i] = strData.charCodeAt(i);
         }
         return arrData;
     },
     _stringConvertToUint8Array:function (strData) {
       
      // View the byte buffer as an array of 8-bit unsigned integers
      var arrData = new Uint8Array(strData.length);
      for (var i=0;i<strData.length;++i) {
          arrData[i] = strData.charCodeAt(i);
      }
      // Log the binary array
      //cc.log("SEND ARRAY BUFFER: " + arrData.buffer);
      return arrData;
     },

     sendMassage: function(reqJson,_obj)
     {
      this.setObjByStatus(_obj,reqJson,reqJson.status);

         if (this.m_wsiSendBinary.readyState == WebSocket.OPEN)
         {
            // cc.log("Send Binary WS is waiting...");
             var buf = Encode(reqJson);
             //cc.log("FROM CLIENT:"+buf);
             //console.log("PLAYER SEND:"+reqJson.player_name+" x:"+reqJson.player_x);
    //cc.log("PLAYER SEND X:"+reqJson.player_name+" x:"+reqJson.player_x);
    //cc.log("PLAYER SEND Y:"+reqJson.player_name+" y:"+reqJson.player_y);
             var binary = this._stringConvertToUint8Array(buf);
             if(reqJson.status==2)
       {
        var buf1 = Encode(reqJson);
            cc.log("FROM CLIENT reqJson.status==2:"+buf1);
       }
       else if(reqJson.status==8)
       {
      var buf1 = Encode(reqJson);
            cc.log("FROM CLIENT reqJson.status==8:"+buf1);
       }
             this.m_wsiSendBinary.send(binary.buffer);
         }
         else
         {
             var warningStr = "send binary websocket instance wasn't ready...try again in few seconds";
             cc.log(warningStr);
             this.init();
            
              
         }
     },
     setObjByStatus: function(_obj,_reqJson,_status)
     {
      switch(_status)
      {
       case 0 :
       {
        this.m_msgProtocolContainer.msgProtocol.player_name = _reqJson.player_name;
        
     this.m_msgProtocolContainer.msgProtocol.end_player_pos_x=this.winsize.width / 2;
     this.m_msgProtocolContainer.msgProtocol.end_player_pos_y=this.winsize.height / 2;
        this.m_loginObj = _obj;
        break;
       }
       case 2 :
       {
        this.m_msgProtocolContainer.msgProtocol.player_x = _reqJson.player_x;
        this.m_msgProtocolContainer.msgProtocol.player_y = _reqJson.player_y;
        this.m_msgProtocolContainer.msgProtocol.player_seq = _reqJson.player_seq;
        this.m_msgProtocolContainer.msgProtocol.status = _reqJson.status;
        this.m_GameLayer = _obj;
        break;
       }
       case 100 :
       {
        this.m_GameLayer = _obj;
        break;
       }

      }
     }

});

Lines 1 : this is Cocos2d-x declaration to support cross device web sockets
on the web it is naive HTML5 , in desktop and mobile it is libwebsockets , which we are using in the server also .
Lines 18 -23: Initialize the WebSocket HTML 5 object with the Server ip and port in the constructor
Notice we using the wsapi uri as in our server protocol API name < MEIRY todo link >
We set the massaging type to be binary type for speed .
Also setting the WebSocket onopen listener which is triggered when the connection is successful .
Lines 25 -32: When massage Arived from the server it is coming as binary format , which we need to parse back to text format ,
Then the text massage will be send to handleServerResponse function which is well .. handle the responses (:
Lines 60 - 109: This is the response handler function which based on the game protocol state received
The action is chosen . the function are invoked in the Gamelayer object .
Lines 134 - 167: this function will send the request to the server but before that it will convert the text massage to binary type .  line 146 . and if there are modifications to be done based on the protocol state this is the place they will happen .  lines 157 and 147.



Continue to PART 6 client code where we examine GameLayer.js















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