Zend_Cache and Zend_Service_Flickr

[dgoosens]

hi freaks,

 

This is my situation... I am trying to dive into Zend Framework and to do so I got Zend Framework in Action by Rob ALLEN.

 

I am now playing around with Zend_Services, namely Zend_Service_Flickr. Everything works great, getting the images etc.

But, as this is rather heavy, I'd need to cache my Flickr result.

 

This is my Flickr class:

class Flickr {

    protected $apikey;

    public function __construct() {

        $this->apikey = Zend_Registry::get('config')->flickr_api_key;
    }

    public function search($keywords, $amount = 6) {

        if(empty ($this->apikey)) {
            return null;
        }

        try {
            $flickr = new Zend_Service_Flickr($this->apikey);
            $results = $flickr->tagSearch($keywords, 
                    array(
                        'per_page' => $amount,
                        'tag_mode' => 'all',
                        'license' => 3
                    ));

            if($results->totalResults() > 0) {
                return $results;
            }

        } catch (Zend_Service_Exception $e) {
            return null;
        }

        return null;
    }
}

 

and this is the part of my controller that should deal with caching the result:

      $frontendOptions = array(
            'lifetime' => 300,
            'automatic_serialization' => true
        );

        $backendOptions = array(
            'cache_dir' => ROOT_DIR . '/var/cache/'
        );
        
        $cache = Zend_Cache::factory('Core', 'File', $frontendOptions, $backendOptions);
        if(!$results = $cache->load('flickr')) {
            $flickr = new Flickr;
            $results = $flickr->search($article->keywords);

            if($results != null) {
                $cache->save($results, 'flickr');

                
            }
        }

        $this->view->flickr = $results;

 

When there is no cache, the images show up without any problem.

In my cache directory, two files are created:

- zend_cache---flickr

- zend_cache---internal-metadatas---flickr

 

However, when reloading my page, and thus trying to get the data out of the cache, no images show up.

When I print_r($this->result) in my view, I allways get the same array:

Zend_Service_Flickr_ResultSet Object
(
    [totalResultsAvailable] => 139778
    [totalResultsReturned] => 6
    [firstResultPosition] => 1
    [_results:protected] => DOMNodeList Object
        (
        )

    [_flickr:private] => Zend_Service_Flickr Object
        (
            [apiKey] => XXXX_API_KEY_XXXX
            [_restClient:protected] => Zend_Rest_Client Object
                (
                    [_data:protected] => Array
                        (
                        )

                    [_uri:protected] => Zend_Uri_Http Object
                        (
                            [_username:protected] => 
                            [_password:protected] => 
                            [_host:protected] => www.flickr.com
                            [_port:protected] => 80
                            [_path:protected] => /services/rest/
                            [_query:protected] => 
                            [_fragment:protected] => 
                            [_regex:protected] => Array
                                (
                                    [escaped] => %[[:xdigit:]]{2}
                                    [unreserved] => [A-Za-z0-9-_.!~*'()\[\]]
                                    [segment] => (?:%[[:xdigit:]]{2}|[A-Za-z0-9-_.!~*'()\[\]:@&=+$,;])*
                                    [path] => (?:\/(??:%[[:xdigit:]]{2}|[A-Za-z0-9-_.!~*'()\[\]:@&=+$,;])*)?)+
                                    [uric] => (?:%[[:xdigit:]]{2}|[A-Za-z0-9-_.!~*'()\[\];\/?:@&=+$,])
                                )

                            [_scheme:protected] => http
                        )

                )

        )

    [_currentIndex:private] => 0
)

... but the images just don't show up.

 

Now, I am figuring that there might be some kind of problem with the serialization/unserialization of the Flickr object.

Zend_Cache works fine - tried a string and an array.

 

Any clues why the images just don't show up ?

Thanks a lot in advance freaks !

dGo

[dgoosens]

Hi guys,

 

Nobody has a clue ?

 

thanks once more !

[448191]

I see _results is a DOMNodeList. That is an internal structure that wont serialize. You'll have to fetch the results in the resultset into a serializable composite, like an array or object of a userland class.

[dgoosens]

thanks a lot for your reply 448191

 

So, if I am getting this right, I should, within my Flickr class, convert the $result into an array... Would that work ?

 

I guess I could iterate through the DOMNodeList and insert all the data into an array... or would there be some toArray() method that I could use for this ?

[448191]

thanks a lot for your reply 448191

 

So, if I am getting this right, I should, within my Flickr class, convert the $result into an array... Would that work ?

 

I guess I could iterate through the DOMNodeList and insert all the data into an array... or would there be some toArray() method that I could use for this ?

 

Yes and I don't know. But I assume you're smart enough to figure it out from here, if not you can send me a PM and we can discuss my hourly rate.

[dgoosens]

[...]if not you can send me a PM and we can discuss my hourly rate.

 

I was only asking for advice... I thought this was the purpose of this forum...

I did not ask you to write one single line of code did I...

 

but thanks anyway...

[448191]

It was a joke. Meant to illustrate that since I don't know the specific API heart, and you are currently working on it, you looking it up would be quicker than me looking it up and you waiting until I have an answer.

[dgoosens]

oh OK...

 

lol - sorry...

I am trying to figure this out while doing the job that I am payed for, which has nothing to do with PHP and is rather boring right now...

 

I'll post my solution when I'll have one.

[dgoosens]

well...

finally got to the real business... (not at work anymore)

 

Thus, I changed the $result of my Flickr class into an array and now the Zend_Cache is working... and serializing the data correctly.

Here is my new class:

class Flickr {

    protected $apikey;

    public function __construct() {

        $this->apikey = Zend_Registry::get('config')->flickr_api_key;
    }

    public function search($keywords, $amount = 6) {

        if(empty ($this->apikey)) {
            return null;
        }

        try {
            $flickr = new Zend_Service_Flickr($this->apikey);
            $results = $flickr->tagSearch($keywords, 
                    array(
                        'per_page' => $amount,
                        'tag_mode' => 'all',
                        'license' => 3
                    ));

            if($results->totalResults() > 0) {
                foreach ($results as $key => $value) {
                    $resultsArray[$key] = $value;
                }
                return $resultsArray;
            }

            

        } catch (Zend_Service_Exception $e) {
            return null;
        }

        return null;
    }
}

 

I just had to change one line in my view... but it is working great now.

 

Thanks a lot for your help 448191 !

 

dGo