如何在请求之外的Express中访问会话？

/**
 * Shished singleton. 
 *
 * @api public
 */
function Shished() {
};


Shished.prototype.getHandshakeValue = function( socket, key, handshake ) {                          
    if( !handshake ) {
        handshake = socket.manager.handshaken[ socket.id ];                                         
    }
    return handshake.shished[ key ];                                                                
};                                                                                                  

Shished.prototype.setHandshakeValue = function( socket, key, value, handshake ) {                   
    if( !handshake ) {
        handshake = socket.manager.handshaken[ socket.id ];                                         
    }
    if( !handshake.shished ) {
        handshake.shished = {};                                                                     
    }
    handshake.shished[ key ] = value;                                                               
};

io.set(\'authorization\', function(handshake, callback) {
    self.setHandshakeValue( null, \'userId\', null, handshake );
    if (handshake.headers.cookie) {
        var cookie = connect.utils.parseCookie(handshake.headers.cookie);
        self.mongoStore()
        .getStore()
        .get(cookie[\'connect.sid\'], function(err, session) {
            if(!err && session && session.auth && session.auth.loggedIn ) {
                self.setHandshakeValue( null,
                            \'userId\',
                            session.auth.userId,
                            handshake );
            }
        });
    }

model._author = shished.getHandshakeValue( socket, \'userId\' );

var MongoStore = require(\'connect-mongo\')(session);
var mongoStore = new MongoStore({
    db:settings.db,            //these options values may different
    port:settings.port,
    host:settings.host
})
app.use(session({
    store : mongoStore
    //here may be more options,but store must be mongoStore above defined
}));

req.session.userEmail;

var cookie = require(\"cookie\"); //it may be defined at the top of the file
io.on(\"connection\",function(connection){

 var tS = cookie.parse(connection.handshake.headers.cookie)[\'connect.sid\'];
 var sessionID = tS.split(\".\")[0].split(\":\")[1];
 mongoStore.get(sessionID,function(err,session){
      console.log(session.userEmail);
 });
}

socket.handshake

io.sockets.on(\'connection\', function(socket) { 
  console.log(socket.handshake.sessionID);
});

io.on(\'connection\',
function(client) {
  console.log(client.request)
});