/**
* Cronjob endpoint, merges user hashtags and twitter api trends
* and stores the result to redis.
* If any change occurs this service will notify the daemon via
* DeamonController passing a new array of trends to track.
*
* @return Array of trends
*/
public function daemonServiceTrends()
{
// TODO laravel connection
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);
// Api Woeid trends
$trends = [];
foreach ($this->getPlaces() as $city => $woeid) {
$trends = array_merge($trends, $this->requestTrendsByLocation($woeid));
}
// Save woeid_hashtags
$redis->set('woeid_hashtags', json_encode($trends));
// User trends
$hashtags = Hashtag::all();
foreach ($hashtags as $hashtag) {
array_push($trends, $hashtag->name);
}
// Discard duplicates
array_unique($trends);
$redisTrends = json_decode($redis->get('daemon_hashtags'));
// If any change, return
if ($trends == $redisTrends) {
return response()->json(null)->header('Content-Type', 'application/json');
}
// Store new hashtags to database
$redis->set('daemon_hashtags', json_encode(array($trends)));
$notify = new DaemonController();
$notify->updateTrends($trends);
return response()->json($trends)->header('Content-Type', 'application/json');
}
