读pomelo的教程-2

下面从头到尾记录chat demo的Login的过程

1. client:点击login按钮，取得username和rid两个值

   $("#login").click(function() {
           username = $("#loginUser").attr("value");
           rid = $('#channelList').val();

   之后对username和rid验证

2. client：连接gate服务器

   pomelo.init({
                   host: host,
                   port: port,
                   log: true
               }

   请求路由 'gate.gateHandler.queryEntry'。

   pomelo.request(route, {
               uid: uid
           }

3. server：gate服务器

   handler.queryEntry = function(msg, session, next) {
       var uid = msg.uid;
       if(!uid) {
           next(null, {
               code: 500
           });
           return;
       }
       // get all connectors
       var connectors = this.app.getServersByType('connector');
       if(!connectors || connectors.length === 0) {
           next(null, {
               code: 500
           });
           return;
       }
       // select connector
       var res = dispatcher.dispatch(uid, connectors);
       next(null, {
           code: 200,
           host: res.host,
           port: res.clientPort
       });
   };

   主要就是分配一个connector服务器，返回它的host和port

4. client：连接connector服务器

   var route = "connector.entryHandler.enter";
                   pomelo.request(route, {
                       username: username,
                       rid: rid
                   }

5. server：connector服务器

   handler.enter = function(msg, session, next) {
       var self = this;
       var rid = msg.rid;
       var uid = msg.username + '*' + rid
       var sessionService = self.app.get('sessionService');
   
       console.log("rid="+rid +" uid="+uid);
       //duplicate log in
       if( !! sessionService.getByUid(uid)) {
           next(null, {
               code: 500,
               error: true
           });
           return;
       }
   
       session.bind(uid);
       session.set('rid', rid);
       session.push('rid', function(err) {
           if(err) {
               console.error('set rid for session service failed! error is : %j', err.stack);
           }
       });
       session.on('closed', onUserLeave.bind(null, self.app));
   
       //put user into channel
       self.app.rpc.chat.chatRemote.add(session, uid, self.app.get('serverId'), rid, true, function(users){
           next(null, {
               users:users
           });
       });
   };

   检测一下是否重复登陆了，把session与uid绑定，在setting里设置rid，注意需要push，session设置回调“closed”，rpc调用chat服务器

6. server：chat服务器添加用户

   ChatRemote.prototype.add = function(uid, sid, name, flag, cb) {
       var channel = this.channelService.getChannel(name, flag);
       var username = uid.split('*')[0];
       var param = {
           route: 'onAdd',
           user: username
       };
       channel.pushMessage(param);
   
       if( !! channel) {
           channel.add(uid, sid);
       }
   
       cb(this.get(name, flag));
   };

   这里的uid是“uid*rid”, sid是server id，name是rid，flag是true。向channel中所有用户发送onaAdd信息，再把uid加入channel