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<?php
namespace MailPoet\Cron;
if (!defined('ABSPATH')) exit;
use MailPoet\Router\Endpoints\CronDaemon as CronDaemonEndpoint;
use MailPoet\Router\Router;
use MailPoet\Settings\SettingsController;
use MailPoet\Util\Security;
use MailPoet\WP\Functions as WPFunctions;
class CronHelper {
const DAEMON_EXECUTION_LIMIT = 20; // seconds
const DAEMON_REQUEST_TIMEOUT = 5; // seconds
const DAEMON_SETTING = 'cron_daemon';
const DAEMON_STATUS_ACTIVE = 'active';
const DAEMON_STATUS_INACTIVE = 'inactive';
// Error codes
const DAEMON_EXECUTION_LIMIT_REACHED = 1001;
/** @var SettingsController */
private $settings;
/** @var WPFunctions */
private $wp;
public function __construct(
SettingsController $settings,
WPFunctions $wp
) {
$this->settings = $settings;
$this->wp = $wp;
}
public function getDaemonExecutionLimit() {
$limit = $this->wp->applyFilters('mailpoet_cron_get_execution_limit', self::DAEMON_EXECUTION_LIMIT);
return $limit;
}
public function getDaemonExecutionTimeout() {
$limit = $this->getDaemonExecutionLimit();
$timeout = $limit * 1.75;
return $this->wp->applyFilters('mailpoet_cron_get_execution_timeout', $timeout);
}
public function createDaemon($token) {
$daemon = [
'token' => $token,
'status' => self::DAEMON_STATUS_ACTIVE,
'run_accessed_at' => null,
'run_started_at' => null,
'run_completed_at' => null,
'last_error' => null,
'last_error_date' => null,
];
$this->saveDaemon($daemon);
return $daemon;
}
public function restartDaemon($token) {
return $this->createDaemon($token);
}
public function getDaemon() {
return $this->settings->fetch(self::DAEMON_SETTING);
}
public function saveDaemonLastError($error) {
$daemon = $this->getDaemon();
if ($daemon) {
$daemon['last_error'] = $error;
$daemon['last_error_date'] = time();
$this->saveDaemon($daemon);
}
}
public function saveDaemonRunCompleted($runCompletedAt) {
$daemon = $this->getDaemon();
if ($daemon) {
$daemon['run_completed_at'] = $runCompletedAt;
$this->saveDaemon($daemon);
}
}
public function saveDaemon($daemon) {
$daemon['updated_at'] = time();
$this->settings->set(
self::DAEMON_SETTING,
$daemon
);
}
public function deactivateDaemon($daemon) {
// We do not need to deactivate an inactive daemon
if (isset($daemon['status']) && $daemon['status'] === self::DAEMON_STATUS_INACTIVE) {
return;
}
$daemon['status'] = self::DAEMON_STATUS_INACTIVE;
$this->settings->set(
self::DAEMON_SETTING,
$daemon
);
}
public function createToken() {
return Security::generateRandomString();
}
public function pingDaemon() {
$url = $this->getCronUrl(
CronDaemonEndpoint::ACTION_PING_RESPONSE
);
$result = $this->queryCronUrl($url);
if (is_wp_error($result)) return $result->get_error_message();
$response = $this->wp->wpRemoteRetrieveBody($result);
$response = substr(trim($response), -strlen(DaemonHttpRunner::PING_SUCCESS_RESPONSE)) === DaemonHttpRunner::PING_SUCCESS_RESPONSE ?
DaemonHttpRunner::PING_SUCCESS_RESPONSE :
$response;
return $response;
}
public function validatePingResponse($response) {
return $response === DaemonHttpRunner::PING_SUCCESS_RESPONSE;
}
public function accessDaemon($token) {
$data = ['token' => $token];
$url = $this->getCronUrl(
CronDaemonEndpoint::ACTION_RUN,
$data
);
$daemon = $this->getDaemon();
if (!$daemon) {
throw new \LogicException('Daemon does not exist.');
}
$daemon['run_accessed_at'] = time();
$this->saveDaemon($daemon);
$result = $this->queryCronUrl($url);
return $this->wp->wpRemoteRetrieveBody($result);
}
/**
* @return bool|null
*/
public function isDaemonAccessible() {
$daemon = $this->getDaemon();
if (!$daemon || !isset($daemon['run_accessed_at'])) {
return null;
}
if ($daemon['run_accessed_at'] <= (int)$daemon['run_started_at']) {
return true;
}
if (
$daemon['run_accessed_at'] + self::DAEMON_REQUEST_TIMEOUT < time() &&
$daemon['run_accessed_at'] > (int)$daemon['run_started_at']
) {
return false;
}
return null;
}
public function queryCronUrl($url) {
$args = $this->wp->applyFilters(
'mailpoet_cron_request_args',
[
'blocking' => true,
'sslverify' => false,
'timeout' => self::DAEMON_REQUEST_TIMEOUT,
'user-agent' => 'MailPoet Cron',
]
);
return $this->wp->wpRemotePost($url, $args);
}
public function getCronUrl($action, $data = false) {
$url = Router::buildRequest(
CronDaemonEndpoint::ENDPOINT,
$action,
$data
);
$customCronUrl = $this->wp->applyFilters('mailpoet_cron_request_url', $url);
return ($customCronUrl === $url) ?
str_replace(home_url(), $this->getSiteUrl(), $url) :
$customCronUrl;
}
public function getSiteUrl($siteUrl = false) {
// additional check for some sites running inside a virtual machine or behind
// proxy where there could be different ports (e.g., host:8080 => guest:80)
if (!$siteUrl) {
$siteUrl = defined('MAILPOET_CRON_SITE_URL') ? MAILPOET_CRON_SITE_URL : $this->wp->homeUrl();
}
$parsedUrl = parse_url($siteUrl);
if (!is_array($parsedUrl)) {
throw new \Exception(__('Site URL is unreachable.', 'mailpoet'));
}
$callScheme = '';
if (isset($parsedUrl['scheme']) && ($parsedUrl['scheme'] === 'https')) {
$callScheme = 'ssl://';
}
// 1. if site URL does not contain a port, return the URL
if (!isset($parsedUrl['port']) || empty($parsedUrl['port'])) return $siteUrl;
// 2. if site URL contains valid port, try connecting to it
$urlHost = $parsedUrl['host'] ?? '';
$fp = @fsockopen($callScheme . $urlHost, $parsedUrl['port'], $errno, $errstr, 1);
if ($fp) return $siteUrl;
// 3. if connection fails, attempt to connect the standard port derived from URL
// schema
$urlScheme = $parsedUrl['scheme'] ?? '';
$port = (strtolower($urlScheme) === 'http') ? 80 : 443;
$fp = @fsockopen($callScheme . $urlHost, $port, $errno, $errstr, 1);
if ($fp) return sprintf('%s://%s', $urlScheme, $urlHost);
// 4. throw an error if all connection attempts failed
throw new \Exception(__('Site URL is unreachable.', 'mailpoet'));
}
public function enforceExecutionLimit($timer) {
$elapsedTime = microtime(true) - $timer;
if ($elapsedTime >= $this->getDaemonExecutionLimit()) {
throw new \Exception(__('Maximum execution time has been reached.', 'mailpoet'), self::DAEMON_EXECUTION_LIMIT_REACHED);
}
}
}