Retrieve walkthrough

Function order:

• Call import-cron.php
• Call PF_Feed_Item::assemble_feed_for_pull()
• Call PF_Feed_Item::get_the_feed_object() (feed-items.php:ln321)
• Call PF_Feed_Retrieve::step_through_feedlist()
• Retrieve feedlist using pf_feedlist (ln316)
• Get feeds_iteration option to determine position.
• Check if option indicates we are go to retrieve feeds_go_switch
• Check what the last iteration was from option prev_iteration
• Insure current iteration count is one greater than the last count.
• Check that we are past the last feed.
• Get the feed data from the feedlist by taking what is stored in the feeds_iteration as the position of the array. (slurp.php:ln190)
• Check that the system has properly notified other actors that we have inside the overall iteration with the iterate_going_switch
• Check if we are on the last key.
• If we are, we'll need to reset the retrieval process and set the iterate_going_switch to zero, so no further iteration occurs. We'll also be setting the feed position back to zero.
• If we are not then iterate the feeds_iteration variable in order to send the next iteration to the correct location.
• If neither case is true than ... huh? We're going to log it. (slurp.php:ln235)
• Update the feeds_iteration option with the new value so the next iteration works.
• If the feed is empty or an error and it isn't the last key, re-call this function to get the next feed.
• If the feed is empty and this is the last feed, set all states ready to reset and return false.
• Take the feed object and transform it into an object containing items we can understand by calling feed_handler() (slurp.php:ln265)
• Set up the feed CPT
• Check if the feed type is on the Feed CPT by calling PF_Feeds_Schema::get_pf_feed_type($id). (slurp.php:ln394)
• Get post meta by id to check for feed type. (feeds.php:ln416)
• IF an error is returned or a false is returned pass-through the fail data.
• ELSE return the type.
• Check if the feed's type exists with PF_Feed_Retrieve::does_type_exist($type)
• Use get_the_feed_object() to get the object using the correct module function.
• Unlock the process so that the system knows it can go ahead and retrieve another feed.
• Return the translated set of items.
• Attempt to retrieve the feed (ln266)
• If it fails, log it.
• Check for failure states and log
• Check for bad process states and log.
• If all is well, return the Feed as an object.
• Begin the loop to move through each feed item and send it to the database. (feed-items.php:ln321)
• Create each post and add the meta data to post_meta
• Advance Feeds using advance_feeds()