path: root/include/queue.php

<?php /** @file */
require_once("boot.php");
require_once('include/cli_startup.php');
require_once('include/queue_fn.php');
require_once('include/zot.php');

function queue_run($argv, $argc){

	cli_startup();

	global $a;

	require_once('include/items.php');
	require_once('include/bbcode.php');

	if(argc() > 1)
		$queue_id = argv(1);
	else
		$queue_id = 0;

	logger('queue: start');

	// delete all queue items more than 3 days old
	// but first mark these sites dead if we haven't heard from them in a month

	$r = q("select outq_posturl from outq where outq_created < %s - INTERVAL %s",
		db_utcnow(), db_quoteinterval('3 DAY')
	);
	if($r) {
		foreach($r as $rr) {
			$site_url = '';
			$h = parse_url($rr['outq_posturl']);
			$desturl = $h['scheme'] . '://' . $h['host'] . (($h['port']) ? ':' . $h['port'] : '');
			q("update site set site_dead = 1 where site_dead = 0 and site_url = '%s' and site_update < %s - INTERVAL %s",
				dbesc($desturl),
				db_utcnow(), db_quoteinterval('1 MONTH')
			);
		}
	}

	$r = q("DELETE FROM outq WHERE outq_created < %s - INTERVAL %s",
		db_utcnow(), db_quoteinterval('3 DAY')
	);

	if($queue_id) {
		$r = q("SELECT * FROM outq WHERE outq_hash = '%s' LIMIT 1",
			dbesc($queue_id)
		);
	}
	else {

		// For the first 12 hours we'll try to deliver every 15 minutes
		// After that, we'll only attempt delivery once per hour. 
		// This currently only handles the default queue drivers ('zot' or '') which we will group by posturl 
		// so that we don't start off a thousand deliveries for a couple of dead hubs.
		// The zot driver will deliver everything destined for a single hub once contact is made (*if* contact is made).
		// Other drivers will have to do something different here and may need their own query.

		// Note: this requires some tweaking as new posts to long dead hubs once a day will keep them in the 
		// "every 15 minutes" category. We probably need to prioritise them when inserted into the queue
		// or just prior to this query based on recent and long-term delivery history. If we have good reason to believe
		// the site is permanently down, there's no reason to attempt delivery at all, or at most not more than once 
		// or twice a day. 

		// FIXME: can we sort postgres on outq_priority and maintain the 'distinct' ?
		// The order by max(outq_priority) might be a dodgy query because of the group by.
		// The desired result is to return a sequence in the order most likely to be delivered in this run.
		// If a hub has already been sitting in the queue for a few days, they should be delivered last;
		// hence every failure should drop them further down the priority list.
 
		if(ACTIVE_DBTYPE == DBTYPE_POSTGRES) {
			$prefix = 'DISTINCT ON (outq_posturl)';
			$suffix = 'ORDER BY outq_posturl';
		} else {
			$prefix = '';
			$suffix = 'GROUP BY outq_posturl ORDER BY max(outq_priority)';
		}
		$r = q("SELECT $prefix * FROM outq WHERE outq_delivered = 0 and (( outq_created > %s - INTERVAL %s and outq_updated < %s - INTERVAL %s ) OR ( outq_updated < %s - INTERVAL %s )) $suffix",
			db_utcnow(), db_quoteinterval('12 HOUR'),
			db_utcnow(), db_quoteinterval('15 MINUTE'),
			db_utcnow(), db_quoteinterval('1 HOUR')
		);
	}
	if(! $r)
		return;

	foreach($r as $rr) {
		queue_deliver($rr);
	}
}

if (array_search(__file__,get_included_files())===0){
  queue_run($argv,$argc);
  killme();
}