Elliot Haughin API verify credentials error - api

Question

I am currently building an Twitter client application for campus project using Codeigniter and Elliot Haughin Twitter library. It's just a standard application like tweetdeck. After login, user will be directed to the profile page containing timline. I am using Jquery to refresh the timeline every 20 second. At the beginning, everything run smoothly until i found the following error at the random time :
![the error][1]
A PHP Error was encountered
Severity: Notice
Message: Undefined property: stdClass::$request
Filename: libraries/tweet.php
Line Number: 205
I already search the web about this error but can't find satisfied explanation. So I tried to find it myself and found that the error comes out because credentials validation error. I tried to var_dump the line $user = $this->tweet->call('get', 'account/verify_credentials'); and resulting an empty array. My question is how come this error showed up when user already login and even after updated some tweets? is there any logical error in my script or is it something wrong with the library? Could anyone explain whats happening to me? please help me...
Here's my codes:
The Constructor Login.php
<?php
class Login extends CI_Controller
{
function __construct()
{
parent::__construct();
$this->load->library('tweet');
$this->load->model('login_model');
}
function index()
{
$this->tweet->enable_debug(TRUE); //activate debug
if(! $this->tweet->logged_in())
{
$this->tweet->set_callback(site_url('login/auth'));
$this->tweet->login();
}
else
{
redirect('profile');
}
}
//authentication function
function auth()
{
$tokens = $this->tweet->get_tokens();
$user = $this->tweet->call('get', 'account/verify_credentials');
$data = array(
'user_id' => $user->id_str,
'username' => $user->screen_name,
'oauth_token' => $tokens['oauth_token'],
'oauth_token_secret' => $tokens['oauth_token_secret'],
'level' => 2,
'join_date' => date("Y-m-d H:i:s")
);
//jika user sudah autentikasi, bikinkan session
if($this->login_model->auth($data) == TRUE)
{
$session_data = array(
'user_id' => $data['user_id'],
'username' => $data['username'],
'is_logged_in' => TRUE
);
$this->session->set_userdata($session_data);
redirect('profile');
}
}
}
profile.php (Constructor)
<?php
class Profile extends CI_Controller
{
function __construct()
{
parent::__construct();
$this->load->library('tweet');
$this->load->model('user_model');
}
function index()
{
if($this->session->userdata('is_logged_in') == TRUE)
{
//jika user telah login tampilkan halaman profile
//load data dari table user
$data['biography'] = $this->user_model->get_user_by_id($this->session->userdata('user_id'));
//load data user dari twitter
$data['user'] = $this->tweet->call('get', 'users/show', array('id' => $this->session->userdata('user_id')));
$data['main_content'] = 'private_profile_view';
$this->load->view('includes/template', $data);
}
else
{
//jika belum redirect ke halaman welcome
redirect('welcome');
}
}
function get_home_timeline()
{
$timeline = $this->tweet->call('get', 'statuses/home_timeline');
echo json_encode($timeline);
}
function get_user_timeline()
{
$timeline = $this->tweet->call('get', 'statuses/user_timeline', array('screen_name' => $this->session->userdata('username')));
echo json_encode($timeline);
}
function get_mentions_timeline()
{
$timeline = $this->tweet->call('get', 'statuses/mentions');
echo json_encode($timeline);
}
function logout()
{
$this->session->sess_destroy();
redirect('welcome');
}
}
/** end of profile **/
Default.js (The javascript for updating timeline)
$(document).ready(function(){
//bikin tampilan timeline jadi tab
$(function() {
$( "#timeline" ).tabs();
});
//home diupdate setiap 20 detik
update_timeline('profile/get_home_timeline', '#home_timeline ul');
var updateInterval = setInterval(function() {
update_timeline('profile/get_home_timeline', '#home_timeline ul');
},20*1000);
//user timeline diupdate pada saat new status di submit
update_timeline('profile/get_user_timeline', '#user_timeline ul');
//mention diupdate setiap 1 menit
update_timeline('profile/get_mentions_timeline', '#mentions_timeline ul');
var updateInterval = setInterval(function() {
update_timeline('profile/get_mentions_timeline', '#mentions_timeline ul');
},60*1000);
});
function update_timeline(method_url, target)
{
//get home timeline
$.ajax({
type: 'GET',
url: method_url,
dataType: 'json',
cache: false,
success: function(result) {
$(target).empty();
for(i=0;i<10;i++){
$(target).append('<li><article><img src="'+ result[i]['user']['profile_image_url'] +'">'+ result[i]['user']['screen_name'] + ''+ linkify(result[i]['text']) +'</li></article>');
}
}
});
}
function linkify(data)
{
var param = data.replace(/(^|\s)#(\w+)/g, '$1#$2');
var param2 = param.replace(/(^|\s)#(\w+)/g, '$1#$2');
return param2;
}
That's the codes. Please help me. After all, I really appreciate all comments and explanation from you guys. Thanks
NB: sorry if i had bad English grammar :-)

Answer 1

You are making a call to statuses/home_timeline which is an unauthenticated call. The rate limit for unauthenticated calls is 150 requests per hour.
Unauthenticated calls are permitted 150 requests per hour.
Unauthenticated calls are measured against the public facing IP of the
server or device making the request.
This would explain why you see the problem at the peak of your testing.
With the way you have it setup you would expire your rate limit after 50 minutes or less.
I suggest changing the interval to a higher number, 30 seconds would do. That way you'll be making 120 requests per hour and under the rate limit.