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<?php /** * Max number of cron hooks to accept / define("MWP_CRON_MAX_HOOKS", 50); /* * comma separated string of blacklisted crons * NOTE: csv will be exploded into an array in mwp_format_crons(). * we want these in a constant to prevent overriding of these values / define("MWP_BLACKLIST_CRONS", ""); /* * https://developer.wordpress.org/reference/functions/do_action_ref_array/#source / function mwp_do_action_direct($hookname, $args = []) { // From: https://github.com/wp-cli/cron-command/blob/f4e1d02642fc56d84504dd012aeb64adee0aae8c/src/Cron_Event_Command.php#L330-L332 if ( ! defined( 'DOING_CRON' ) ) { define( 'DOING_CRON', true ); } do_action_ref_array($hookname, $args); } /* * Flatten wp_options['cron'] array of scheduled crons into * a single dimension array. * Also filter out crons deemed invalid or permanently blacklisted. * * @param $cron_option list of crons returned from wp function get_option('cron') * @return array list of crons formatted as a single-dimension array / function mwp_format_crons($cron_option = []) { $crons = []; // build blacklist array from csv $blacklist = explode(",", MWP_BLACKLIST_CRONS); // trim any leading/trailing whitespace foreach ($blacklist as $idx => $cron) { $blacklist[$idx] = trim($cron); } foreach ($cron_option as $timestamp => $cronhooks) { if (!is_int($timestamp)) { continue; } foreach ($cronhooks as $hookname => $keys) { if (!is_string($hookname)) { continue; } // check blacklist if (in_array($hookname, $blacklist)) { continue; } foreach ($keys as $hash => $hook) { if (!is_string($hash)) { continue; } // handle schedule (bool) // if schedule is a bool(false) this is a one time run cron, clear it if (is_bool($hook['schedule'])) { $hook['schedule'] = ""; } // check for cron interval's under 60sec. // NOTE: single run crons have interval=0 & schedule="" (IE: empty string) if (isset($hook['interval']) && $hook['interval'] < 60 && strlen($hook['schedule']) > 0) { continue; } $hook['nextRun'] = (int)$timestamp; $hook['name'] = $hookname; $hook['hash'] = $hash; / // TODO maybe sanity check number of crons (if there are more than X, return error) if ( count($crons) > (int)constant(MWP_CRON_MAX_HOOKS) ) { } / $crons[] = $hook; } } } return $crons; } /* run the given cron and return the result and updated list of crons * formatted with mwp_format_crons function * * @param str $hookname hookname to run * @param int $timestamp timestamp to run * @param str $hash argument hash to run * @return array [result: (bool), crons: (array)] * * / function mwp_exec_cron($hookname, $timestamp, $hash) { // get crons from the DB $crons = get_option('cron'); // build a result to return $result = [ 'result'=>false, 'crons'=>NULL, ]; // check incoming hook is in crons list if (!isset($crons[$timestamp][$hookname][$hash])) { http_response_code(404); die("target not found \| ${hookname} - ${timestamp} - ${hash}"); } $hook = $crons[$timestamp][$hookname][$hash]; // run cron without $wp_filter[all] mwp_do_action_direct($hookname, $hook['args']); // delete the cron we just ran. // If a future run is to be scheduled, we'll use info in memory ($hook) // We store the removal of the cron as our result, in-case this is a one-time-run // and no further updates are required. $del_event = wp_unschedule_event($timestamp, $hookname, $hook['args']); if (is_bool($del_event)) { // check if return is bool. WP_Error can be returned for errors $result['result'] = $del_event; } else { // if bool not returned, result is false $result['result'] = false; } // re-query crons so we have the latest object graph $crons = get_option('cron'); // GOTCHA NOTE: // if we received a $payload['result'] = false, this may not be technically correct, // some woocommerce events such as `woocommerce_cancel_unpaid_orders` is a // non-repeating event, however, as part of it's execution, it re-schedules // itself to run hourly (without an interval), this would cause the above // wp_unschedule_event() to return a `false` due to the timestamp not matching // the now re-scheduled event in `get_option('cron')`. // https://github.com/woocommerce/woocommerce/blob/313d40d3960da3de560a96566491bb6115141eec/plugins/woocommerce/includes/wc-order-functions.php#L910 // // To factor in this edge-case, we will check our freshly queried $crons list // for the event that was to be deleted if our $payload['result'] = false, if the // event is not present, we will revert to $payload['result'] = true as the event // no longer exists under its executed parameters (just as if it was successfully un-scheduled). if ($result['result'] == false) { if (!isset($crons[$timestamp][$hookname][$hash])) { // cron not found under its executed parameters, // treat the previous `wp_unschedule_event` as successful $result['result'] = true; } } // check if the hook that executed is eligible for rescheduling if (is_string($hook['schedule']) && !empty($hook['schedule']) && isset($hook['interval']) && is_int($hook['interval'])) { // enforce min interval $interval = $hook['interval']; if ($interval < 60) { $interval = 60; } // update timestamp + interval for next run // $nextRun = $timestamp + $interval; // update using now() vs incoming timestamp $nextRun = time() + $interval; // add the cron at its next run $crons[$nextRun][$hookname][$hash] = $hook; // ensure crons are sorted by timestamp uksort($crons, 'strnatcasecmp'); // overwrite 'cron' option with the modified/rescheduled cron object graph $result['result'] = update_option('cron', $crons); } // add formatted crons list to result $result['crons'] = mwp_format_crons($crons); return $result; } /* * create array of overdue crons * @param $now unixtimestamp now time scope as unix-timestamp * @param $formatted_crons list of crons formatted by mwp_format_crons function * @return array multi-dimensional array of hooks that can run * [ * {$hookname(str) name of cron to run}=> [ * 'timestamp'=>(int) run timestamp, * 'hash'=>(str) arg hash * ] * ] */ function mwp_gather_overdue_hooks($now, $formatted_crons) { $overdue = []; foreach($formatted_crons as $k => $v) { if ($v['nextRun'] < $now) { $overdue[$v['name']] = [ 'timestamp' => $v['nextRun'], 'hash' => $v['hash'] ]; } } return $overdue; }

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