Add basic cron support

workers_manager.py

@@ -1,15 +1,19 @@
 import importlib
 import pip
+from interruptingcow import timeout
 
 class WorkersManager:
   def __init__(self, config):
     self._config = config
+    self._interval_enabled_workers = {}
     self._workers = self._register_klasses()
 
   def update(self, worker_name):
-    messages = self.workers[worker_name].status_update()
-    for message in messages:
-      message.topic = '/'.join([self._config[worker_name]['topic_prefix'], message.topic])
+    messages = []
+    with timeout(30):
+      messages = self.workers[worker_name].status_update()
+      for message in messages:
+        message.topic = '/'.join([self._config[worker_name]['topic_prefix'], message.topic])
 
     return messages
 
@@ -17,14 +21,23 @@ class WorkersManager:
   def workers(self):
     return self._workers
 
+  @property
+  def interval_enabled_workers(self):
+    return self._interval_enabled_workers
+
   def _register_klasses(self):
     arr = {}
 
     for worker_klass in self._config.keys():
       moduleObj = importlib.import_module("workers.%s" % worker_klass)
       klass = getattr(moduleObj, "%sWorker" % worker_klass.title())
+
       if moduleObj.REQUIREMENTS is not None:
         self._pip_install_helper(moduleObj.REQUIREMENTS)
+
+      if self._config[worker_klass]['update_interval'] is not None:
+        self._interval_enabled_workers[worker_klass] = self._config[worker_klass]['update_interval']
+
       arr[worker_klass] = klass(**self._args_for(worker_klass))
 
     return arr