'Google_Exception' with message 'Cant add services after having authenticated' - google-analytics

Question

I am working on a WP plugin with Google Analytics, using Oauth 2.0.
All of my authentication & data pulls work fine, with the exception of this one issue: the first time I get a new Google authorization code (ex: "4/-xbSbg...." ) & authenticate, then try to call a new Google_AnalyticsService() object, it tosses back the error:
'Google_Exception' with message 'Cant add services after having authenticated'
This is on line 109: http://code.google.com/p/google-api-php-client/source/browse/trunk/src/apiClient.php?r=258
Once I refresh the page that calls this code, it works fine - ie, the first branch of the check_login() is ok, but the authentication call is not working correctly.
You see that the code seems to be complaining because I DID authenticate first, and the message says I shouldn't do that. The comment & code really have me confused what my issue is (login code not very clean yet, I realize).
IMPORTANT NOTE: I am using the Google Auth for Installed Apps, and so we are asking for an auth code from user, and using that to obtain the auth token.
get_option(), set_option() & update_option() are WP native functions that are not a part of the problem
Here is my code:
class GoogleAnalyticsStats
{
var $client = false;
function GoogleAnalyticsStats()
{
$this->client = new Google_Client();
$this->client->setClientId(GOOGLE_ANALYTICATOR_CLIENTID);
$this->client->setClientSecret(GOOGLE_ANALYTICATOR_CLIENTSECRET);
$this->client->setRedirectUri(GOOGLE_ANALYTICATOR_REDIRECT);
$this->client->setScopes(array(GOOGLE_ANALYTICATOR_SCOPE));
// Magic. Returns objects from the Analytics Service instead of associative arrays.
$this->client->setUseObjects(true);
}
function checkLogin()
{
$ga_google_authtoken = get_option('ga_google_authtoken');
if (!empty($ga_google_authtoken))
{
$this->client->setAccessToken($ga_google_authtoken);
}
else
{
$authCode = get_option('ga_google_token');
if (empty($authCode)) return false;
$accessToken = $this->client->authenticate($authCode);
$this->client->setAccessToken($accessToken);
update_option('ga_google_authtoken', $accessToken);
}
return true;
}
function getSingleProfile()
{
$analytics = new Google_AnalyticsService($this->client);
}
}

Answer 1

You will need to move $analytics = new Google_AnalyticsService($this->client); inside function GoogleAnalyticsStats(), and preferably turn $analytics into a member variable.
class GoogleAnalyticsStats
{
var $client = false;
var $analytics = false;
function GoogleAnalyticsStats()
{
$this->client = new Google_Client();
$this->client->setClientId(GOOGLE_ANALYTICATOR_CLIENTID);
$this->client->setClientSecret(GOOGLE_ANALYTICATOR_CLIENTSECRET);
$this->client->setRedirectUri(GOOGLE_ANALYTICATOR_REDIRECT);
$this->client->setScopes(array(GOOGLE_ANALYTICATOR_SCOPE));
// Magic. Returns objects from the Analytics Service instead of associative arrays.
$this->client->setUseObjects(true);
$this->analytics = new Google_AnalyticsService($this->client);
}
...
Now, you can make calls to the analytics API from within getSingleProfile.