friendica/include/cron.php

<?php
use \Friendica\Core\Config;

require_once('include/photos.php');
require_once('include/user.php');

function cron_run(&$argv, &$argc){
	global $a;

	require_once('include/session.php');
	require_once('include/datetime.php');
	require_once('include/items.php');
	require_once('include/Contact.php');
	require_once('include/email.php');
	require_once('include/socgraph.php');
	require_once('mod/nodeinfo.php');
	require_once('include/post_update.php');

	$last = get_config('system','last_cron');

	$poll_interval = intval(get_config('system','cron_interval'));
	if (! $poll_interval)
		$poll_interval = 10;

	if ($last) {
		$next = $last + ($poll_interval * 60);
		if ($next > time()) {
			logger('cron intervall not reached');
			return;
		}
	}

	logger('cron: start');

	// run queue delivery process in the background

	proc_run(PRIORITY_NEGLIGIBLE, "include/queue.php");

	// run the process to discover global contacts in the background

	proc_run(PRIORITY_LOW, "include/discover_poco.php");

	// run the process to update locally stored global contacts in the background

	proc_run(PRIORITY_LOW, "include/discover_poco.php", "checkcontact");

	// Expire and remove user entries
	cron_expire_and_remove_users();

	// Check OStatus conversations
	proc_run(PRIORITY_MEDIUM, "include/cronjobs.php", "ostatus_mentions");

	// Check every conversation
	proc_run(PRIORITY_MEDIUM, "include/cronjobs.php", "ostatus_conversations");

	// Call possible post update functions
	proc_run(PRIORITY_LOW, "include/cronjobs.php", "post_update");

	// update nodeinfo data
	proc_run(PRIORITY_LOW, "include/cronjobs.php", "nodeinfo");

	// once daily run birthday_updates and then expire in background

	$d1 = get_config('system','last_expire_day');
	$d2 = intval(datetime_convert('UTC','UTC','now','d'));

	if ($d2 != intval($d1)) {

		update_contact_birthdays();

		proc_run(PRIORITY_LOW, "include/discover_poco.php", "update_server");

		proc_run(PRIORITY_LOW, "include/discover_poco.php", "suggestions");

		set_config('system','last_expire_day',$d2);

		proc_run(PRIORITY_LOW, 'include/expire.php');

		proc_run(PRIORITY_MEDIUM, 'include/dbclean.php');

		cron_update_photo_albums();
	}

	// Clear cache entries
	cron_clear_cache($a);

	// Repair missing Diaspora values in contacts
	cron_repair_diaspora($a);

	// Repair entries in the database
	cron_repair_database();

	// Poll contacts
	cron_poll_contacts($argc, $argv);

	logger('cron: end');

	set_config('system','last_cron', time());

	return;
}

/**
 * @brief Update the cached values for the number of photo albums per user
 */
function cron_update_photo_albums() {
	$r = q("SELECT `uid` FROM `user` WHERE NOT `account_expired` AND NOT `account_removed`");
	if (!dbm::is_result($r)) {
		return;
	}

	foreach ($r AS $user) {
		photo_albums($user['uid'], true);
	}
}

/**
 * @brief Expire and remove user entries
 */
function cron_expire_and_remove_users() {
	// expire any expired accounts
	q("UPDATE user SET `account_expired` = 1 where `account_expired` = 0
		AND `account_expires_on` != '0000-00-00 00:00:00'
		AND `account_expires_on` < UTC_TIMESTAMP() ");

	// delete user and contact records for recently removed accounts
	$r = q("SELECT * FROM `user` WHERE `account_removed` AND `account_expires_on` < UTC_TIMESTAMP() - INTERVAL 3 DAY");
	if ($r) {
		foreach($r as $user) {
			q("DELETE FROM `contact` WHERE `uid` = %d", intval($user['uid']));
			q("DELETE FROM `user` WHERE `uid` = %d", intval($user['uid']));
		}
	}
}

/**
 * @brief Poll contacts for unreceived messages
 *
 * @param Integer $argc Number of command line arguments
 * @param Array $argv Array of command line arguments
 */
function cron_poll_contacts($argc, $argv) {
	$manual_id  = 0;
	$generation = 0;
	$force      = false;
	$restart    = false;

	if (($argc > 1) && ($argv[1] == 'force'))
		$force = true;

	if (($argc > 1) && ($argv[1] == 'restart')) {
		$restart = true;
		$generation = intval($argv[2]);
		if (!$generation)
			killme();
	}

	if (($argc > 1) && intval($argv[1])) {
		$manual_id = intval($argv[1]);
		$force     = true;
	}

	$sql_extra = (($manual_id) ? " AND `id` = $manual_id " : "");

	reload_plugins();

	$d = datetime_convert();

	// Only poll from those with suitable relationships,
	// and which have a polling address and ignore Diaspora since
	// we are unable to match those posts with a Diaspora GUID and prevent duplicates.

	$abandon_days = intval(get_config('system','account_abandon_days'));
	if ($abandon_days < 1)
		$abandon_days = 0;

	$abandon_sql = (($abandon_days)
		? sprintf(" AND `user`.`login_date` > UTC_TIMESTAMP() - INTERVAL %d DAY ", intval($abandon_days))
		: ''
	);

	$contacts = q("SELECT `contact`.`id` FROM `user`
			STRAIGHT_JOIN `contact`
			ON `contact`.`uid` = `user`.`uid` AND `contact`.`rel` IN (%d, %d) AND `contact`.`poll` != ''
				AND `contact`.`network` IN ('%s', '%s', '%s', '%s', '%s', '%s') $sql_extra
				AND NOT `contact`.`self` AND NOT `contact`.`blocked` AND NOT `contact`.`readonly`
				AND NOT `contact`.`archive`
			WHERE NOT `user`.`account_expired` AND NOT `user`.`account_removed` $abandon_sql ORDER BY RAND()",
		intval(CONTACT_IS_SHARING),
		intval(CONTACT_IS_FRIEND),
		dbesc(NETWORK_DFRN),
		dbesc(NETWORK_ZOT),
		dbesc(NETWORK_OSTATUS),
		dbesc(NETWORK_FEED),
		dbesc(NETWORK_MAIL),
		dbesc(NETWORK_MAIL2)
	);

	if (!count($contacts)) {
		return;
	}

	foreach ($contacts as $c) {

		$res = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
			intval($c['id'])
		);

		if (!dbm::is_result($res)) {
			continue;
		}

		foreach($res as $contact) {

			$xml = false;

			if ($manual_id)
				$contact['last-update'] = '0000-00-00 00:00:00';

			if (in_array($contact['network'], array(NETWORK_DFRN, NETWORK_ZOT, NETWORK_OSTATUS)))
				$contact['priority'] = 2;

			if ($contact['subhub'] AND in_array($contact['network'], array(NETWORK_DFRN, NETWORK_ZOT, NETWORK_OSTATUS))) {
				// We should be getting everything via a hub. But just to be sure, let's check once a day.
				// (You can make this more or less frequent if desired by setting 'pushpoll_frequency' appropriately)
				// This also lets us update our subscription to the hub, and add or replace hubs in case it
				// changed. We will only update hubs once a day, regardless of 'pushpoll_frequency'.

				$poll_interval = get_config('system','pushpoll_frequency');
				$contact['priority'] = (($poll_interval !== false) ? intval($poll_interval) : 3);
			}

			if ($contact['priority'] AND !$force) {

				$update     = false;

				$t = $contact['last-update'];

				/**
				 * Based on $contact['priority'], should we poll this site now? Or later?
				 */

				switch ($contact['priority']) {
					case 5:
						if (datetime_convert('UTC','UTC', 'now') > datetime_convert('UTC','UTC', $t . " + 1 month"))
							$update = true;
						break;
					case 4:
						if (datetime_convert('UTC','UTC', 'now') > datetime_convert('UTC','UTC', $t . " + 1 week"))
							$update = true;
						break;
					case 3:
						if (datetime_convert('UTC','UTC', 'now') > datetime_convert('UTC','UTC', $t . " + 1 day"))
							$update = true;
						break;
					case 2:
						if (datetime_convert('UTC','UTC', 'now') > datetime_convert('UTC','UTC', $t . " + 12 hour"))
							$update = true;
						break;
					case 1:
					default:
						if (datetime_convert('UTC','UTC', 'now') > datetime_convert('UTC','UTC', $t . " + 1 hour"))
							$update = true;
						break;
				}
				if (!$update)
					continue;
			}

			logger("Polling ".$contact["network"]." ".$contact["id"]." ".$contact["nick"]." ".$contact["name"]);

			if (($contact['network'] == NETWORK_FEED) AND ($contact['priority'] <= 3)) {
				proc_run(PRIORITY_MEDIUM, 'include/onepoll.php', $contact['id']);
			} else {
				proc_run(PRIORITY_LOW, 'include/onepoll.php', $contact['id']);
			}
		}
	}
}

/**
 * @brief Clear cache entries
 *
 * @param App $a
 */
function cron_clear_cache(App $a) {

	$last = get_config('system','cache_last_cleared');

	if ($last) {
		$next = $last + (3600); // Once per hour
		$clear_cache = ($next <= time());
	} else {
		$clear_cache = true;
	}

	if (!$clear_cache) {
		return;
	}

	// clear old cache
	Cache::clear();

	// clear old item cache files
	clear_cache();

	// clear cache for photos
	clear_cache($a->get_basepath(), $a->get_basepath()."/photo");

	// clear smarty cache
	clear_cache($a->get_basepath()."/view/smarty3/compiled", $a->get_basepath()."/view/smarty3/compiled");

	// clear cache for image proxy
	if (!get_config("system", "proxy_disabled")) {
		clear_cache($a->get_basepath(), $a->get_basepath()."/proxy");

		$cachetime = get_config('system','proxy_cache_time');
		if (!$cachetime) {
			$cachetime = PROXY_DEFAULT_TIME;
		}

		q('DELETE FROM `photo` WHERE `uid` = 0 AND `resource-id` LIKE "pic:%%" AND `created` < NOW() - INTERVAL %d SECOND', $cachetime);
	}

	// Delete the cached OEmbed entries that are older than one year
	q("DELETE FROM `oembed` WHERE `created` < NOW() - INTERVAL 3 MONTH");

	// Delete the cached "parse_url" entries that are older than one year
	q("DELETE FROM `parsed_url` WHERE `created` < NOW() - INTERVAL 3 MONTH");

	// Maximum table size in megabyte
	$max_tablesize = intval(get_config('system','optimize_max_tablesize')) * 1000000;
	if ($max_tablesize == 0) {
		$max_tablesize = 100 * 1000000; // Default are 100 MB
	}

	if ($max_tablesize > 0) {
		// Minimum fragmentation level in percent
		$fragmentation_level = intval(get_config('system','optimize_fragmentation')) / 100;
		if ($fragmentation_level == 0) {
			$fragmentation_level = 0.3; // Default value is 30%
		}

		// Optimize some tables that need to be optimized
		$r = q("SHOW TABLE STATUS");
		foreach($r as $table) {

			// Don't optimize tables that are too large
			if ($table["Data_length"] > $max_tablesize) {
				continue;
			}

			// Don't optimize empty tables
			if ($table["Data_length"] == 0) {
				continue;
			}

			// Calculate fragmentation
			$fragmentation = $table["Data_free"] / ($table["Data_length"] + $table["Index_length"]);

			logger("Table ".$table["Name"]." - Fragmentation level: ".round($fragmentation * 100, 2), LOGGER_DEBUG);

			// Don't optimize tables that needn't to be optimized
			if ($fragmentation < $fragmentation_level) {
				continue;
			}

			// So optimize it
			logger("Optimize Table ".$table["Name"], LOGGER_DEBUG);
			q("OPTIMIZE TABLE `%s`", dbesc($table["Name"]));
		}
	}

	set_config('system','cache_last_cleared', time());
}

/**
 * @brief Repair missing values in Diaspora contacts
 *
 * @param App $a
 */
function cron_repair_diaspora(App $a) {
	$r = q("SELECT `id`, `url` FROM `contact`
		WHERE `network` = '%s' AND (`batch` = '' OR `notify` = '' OR `poll` = '' OR pubkey = '')
			ORDER BY RAND() LIMIT 50", dbesc(NETWORK_DIASPORA));
	if (dbm::is_result($r)) {
		foreach ($r AS $contact) {
			if (poco_reachable($contact["url"])) {
				$data = probe_url($contact["url"]);
				if ($data["network"] == NETWORK_DIASPORA) {
					logger("Repair contact ".$contact["id"]." ".$contact["url"], LOGGER_DEBUG);
					q("UPDATE `contact` SET `batch` = '%s', `notify` = '%s', `poll` = '%s', pubkey = '%s' WHERE `id` = %d",
						dbesc($data["batch"]), dbesc($data["notify"]), dbesc($data["poll"]), dbesc($data["pubkey"]),
						intval($contact["id"]));
				}
			}
		}
	}
}

/**
 * @brief Do some repairs in database entries
 *
 */
function cron_repair_database() {

	// Sometimes there seem to be issues where the "self" contact vanishes.
	// We haven't found the origin of the problem by now.
	$r = q("SELECT `uid` FROM `user` WHERE NOT EXISTS (SELECT `uid` FROM `contact` WHERE `contact`.`uid` = `user`.`uid` AND `contact`.`self`)");
	if (dbm::is_result($r)) {
		foreach ($r AS $user) {
			logger('Create missing self contact for user '.$user['uid']);
			user_create_self_contact($user['uid']);
		}
	}

	// Set the parent if it wasn't set. (Shouldn't happen - but does sometimes)
	// This call is very "cheap" so we can do it at any time without a problem
	q("UPDATE `item` INNER JOIN `item` AS `parent` ON `parent`.`uri` = `item`.`parent-uri` AND `parent`.`uid` = `item`.`uid` SET `item`.`parent` = `parent`.`id` WHERE `item`.`parent` = 0");

	// There was an issue where the nick vanishes from the contact table
	q("UPDATE `contact` INNER JOIN `user` ON `contact`.`uid` = `user`.`uid` SET `nick` = `nickname` WHERE `self` AND `nick`=''");

	// Update the global contacts for local users
	$r = q("SELECT `uid` FROM `user` WHERE `verified` AND NOT `blocked` AND NOT `account_removed` AND NOT `account_expired`");
	if (dbm::is_result($r)) {
		foreach ($r AS $user) {
			update_gcontact_for_user($user["uid"]);
		}
	}

	/// @todo
	/// - remove thread entries without item
	/// - remove sign entries without item
	/// - remove children when parent got lost
	/// - set contact-id in item when not present
}