如何使用node.js从codeigniter获取会话

时间:2011-09-22 08:06:16

标签: json codeigniter node.js

我正在编写类似社交网络的应用程序,在我的应用程序中可以显示状态更新和聊天。当我在互联网上搜索时,我发现node.js用于长轮询技术,我想我可以在我的应用程序中使用它进行聊天和流媒体页面。但是当我使用node.js时,我有一个堆栈

这是我想要的项目技术: 1)我在地址localhost:81 / myproject中使用codeigniter for framework和mysql数据库 2)并使用端口127.0.0.1:8080中的node.js来聊天和流式传输页面

这是代码javascript服务器,node.js名称是server.js

var sys = require("sys"),
http = require("http"),
url = require("url"),
path = require("path"),
fs = require("fs"),
events = require("events");

function load_static_file(uri, response) {
var filename = path.join(process.cwd(), uri);
path.exists(filename, function(exists) {
    if(!exists) {
        response.writeHead(404, {"Content-Type": "text/plain"});
        response.write("404 Not Found\n");
        response.end();
        return;
    }

    fs.readFile(filename, "binary", function(err, file) {
        if(err) {
            response.writeHead(500, {"Content-Type": "text/plain"});
            response.write(err + "\n");
            response.end();
            return;
        }

        response.writeHead(200);
        response.write(file, "binary");
        response.end();
    });
});
   } 
   var local_client = http.createClient(81, "localhost");

   var local_emitter = new events.EventEmitter();

   function get_users() {
      var request = local_client.request("GET", "/myproject/getUser", {"host": "localhost"});

request.addListener("response", function(response) {
    var body = "";
    response.addListener("data", function(data) {
        body += data;
    });

    response.addListener("end", function() {
        var users = JSON.parse(body);
        if(users.length > 0) {
            local_emitter.emit("users", users);
        }
    });
});

request.end();
 }

 setInterval(get_users, 5000);

 http.createServer(function(request, response) {
    var uri = url.parse(request.url).pathname;
    if(uri === "/stream") {

    var listener = local_emitter.addListener("users", function(users) {
        response.writeHead(200, { "Content-Type" : "text/plain" });
        response.write(JSON.stringify(users));
        response.end();

        clearTimeout(timeout);
    });

       var timeout = setTimeout(function() {
        response.writeHead(200, { "Content-Type" : "text/plain" });
        response.write(JSON.stringify([]));
        response.end();

        local_emitter.removeListener(listener);
       }, 10000);

   }
   else {
       load_static_file(uri, response);
   }
  }).listen(8383);

  sys.puts("Server running at http://localhost:8383/");

现在在codeigniter方面我在url http://localhost:81/myproject/getUser上创建webservices并且响应是json格式,如果没有重定向到登录页面,我使用session auhtentication访问它。

[{"user_id":"2a20f5b923ffaea7927303449b8e76daee7b9b771316488679","token":"3m5biVJMjkCNDk79pGSo","username":"rakhacs","password":"*******","name_first":"rakha","name_middle":"","name_last":"cs","email_id":"email@gmail.com","picture":"img\/default.png","active":"1","online":"0","created_at":"2011-09-20 11:14:43","access":"2","identifier":"ae70c3b56df19a303a7693cdc265f743af5b0a6e"},{"user_id":"9a6e55977e906873830018d95c31d2bf664c2f211316493932","token":"RoUvvPyVt7bGaFhiMVmj","username":"ferdian","password":"*****","name_first":"willy","name_middle":"","name_last":";f;w","email_id":"email1@gmail.com","picture":"img\/default.png","active":"1","online":"0","created_at":"2011-09-20 11:47:20","access":"2","identifier":"1ccd4193fa6b56b96b3889e59c5205cc531177c9"}]

这是我执行node server.js时的问题 我得到像undefined:0 sysntaxerror:unexpected end of input at object.parse(native)

这样的错误

我不知道这个错误我认为因为我使用会话?但我不确定。 当我测试使用test.js测试我的webservices

var http = require("http")
var options = {
    host: 'localhost',
    port: 81,
    path: '/myproject/getUser',
    method: 'GET'
};

var req = http.request(options, function(res) {
    console.log('STATUS: ' + res.statusCode);
    console.log('HEADERS: ' + JSON.stringify(res.headers));
    res.setEncoding('utf8');
    res.on('data', function (chunk) {
    console.log('BODY: ' + chunk);
   });
});
req.on('error', function(e) {
   console.log('problem with request: ' + e.message);
});
// write data to request body
req.write('data\n');
req.write('data\n');
req.end();

这是输出

problem with request: parse error

但是当我使用另一个已经响应json格式的webservice并且没有使用会话时,我可以得到身体响应..如果这个问题是会话我怎么能解决这个问题?这可能让我感到困惑。 。感谢您的评论

1 个答案:

答案 0 :(得分:0)

很难说,但我会主要尝试用jSON发送一个对象,而不是直接发送一个数组。即只是将数组封装到一个对象中:

{"data":[…]}

这“可能”导致解析错误。

为此目的,将以下内容添加到响应的PHP方法中并不坏:

header('Cache-Control: no-cache, must-revalidate');
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
header('Content-type: application/json');