- Adds new "ping" cron daemon router endpoint

- Removes the requirement to have data payload for router requests

lib/Router/Endpoints/CronDaemon.php

@@ -0,0 +1,38 @@
+<?php
+namespace MailPoet\Router\Endpoints;
+
+use MailPoet\Cron\CronHelper;
+use MailPoet\Cron\Daemon;
+
+if(!defined('ABSPATH')) exit;
+
+class CronDaemon {
+  const ENDPOINT = 'cron_daemon';
+  const ACTION_RUN = 'run';
+  const ACTION_PING = 'ping';
+  const ACTION_PING_RESPONSE = 'pingResponse';
+  public $allowed_actions = array(
+    self::ACTION_RUN,
+    self::ACTION_PING,
+    self::ACTION_PING_RESPONSE
+  );
+  public $data;
+
+  function __construct($data) {
+    $this->data = $data;
+  }
+
+  function run() {
+    $queue = new Daemon($this->data);
+    $queue->run();
+  }
+
+  function ping() {
+     die(CronHelper::pingDaemon());
+  }
+
+  function pingResponse() {
+    $queue = new Daemon();
+    $queue->ping();
+  }
+}