Initial work on automatic ingest for imported podcasts

airtime_mvc/application/common/PodcastManager.php

@@ -0,0 +1,74 @@
+<?php
+
+class PodcastManager {
+
+    /**
+     * @var int how often, in seconds, to check for and ingest new podcast episodes
+     */
+    private static $_PODCAST_POLL_INTERVAL_SECONDS = 3600;  // 1 hour
+
+    /**
+     * Check whether $_PODCAST_POLL_INTERVAL_SECONDS have passed since the last call to
+     * downloadNewestEpisodes
+     *
+     * @return bool true if $_PODCAST_POLL_INTERVAL_SECONDS has passed since the last check
+     */
+    public static function hasPodcastPollIntervalPassed() {
+        $lastPolled = Application_Model_Preference::getPodcastPollLock();
+        return empty($lastPolled) || (microtime(true) > $lastPolled + self::$_PODCAST_POLL_INTERVAL_SECONDS);
+    }
+
+    /**
+     * Find all podcasts flagged for automatic ingest whose most recent episode has
+     * yet to be downloaded and download it with Celery
+     *
+     * @throws InvalidPodcastException
+     * @throws PodcastNotFoundException
+     */
+    public static function downloadNewestEpisodes() {
+        $autoIngestPodcasts = static::_getAutoIngestPodcasts();
+        $service = new Application_Service_PodcastEpisodeService();
+        $episodes = array();
+        foreach ($autoIngestPodcasts as $podcast) {
+            /** @var ImportedPodcast $podcast */
+            $podcastArray = Application_Service_PodcastService::getPodcastById($podcast->getDbId());
+            // A bit hacky... sort the episodes by publication date to get the most recent
+            usort($podcastArray["episodes"], array(static::class, "_sortByEpisodePubDate"));
+            $episodeData = $podcastArray["episodes"][0];
+            $episode = PodcastEpisodesQuery::create()->findOneByDbEpisodeGuid($episodeData["guid"]);
+            // Make sure there's no existing episode placeholder or import, and that the data is non-empty
+            if (empty($episode) && !empty($episodeData)) {
+                $placeholder = $service->addPodcastEpisodePlaceholder($podcast->getDbId(), $episodeData);
+                array_push($episodes, $placeholder);
+            }
+        }
+
+        $service->downloadEpisodes($episodes);
+        Application_Model_Preference::setPodcastPollLock(microtime(true));
+    }
+
+    /**
+     * Find all podcasts flagged for automatic ingest
+     *
+     * @return PropelObjectCollection collection of ImportedPodcast objects
+     *                                flagged for automatic ingest
+     */
+    protected static function _getAutoIngestPodcasts() {
+        return ImportedPodcastQuery::create()
+            ->filterByDbAutoIngest(true)
+            ->find();
+    }
+
+    /**
+     * Custom sort function for podcast episodes
+     *
+     * @param array $a first episode array to compare
+     * @param array $b second episode array to compare
+     * @return bool boolean for ordering
+     */
+    protected static function _sortByEpisodePubDate($a, $b) {
+        if ($a["pub_date"] == $b["pub_date"]) return 0;
+        return ($a["pub_date"] < $b["pub_date"]) ? 1 : -1;  // Descending order
+    }
+
+}