Move serverkeyworker into its own package

workers/servicekeyworker/servicekeyworker.py

@@ -0,0 +1,27 @@
+import logging
+from datetime import datetime, timedelta
+
+from app import app, instance_keys
+from data.model.service_keys import set_key_expiration
+from workers.worker import Worker
+
+logger = logging.getLogger(__name__)
+
+class ServiceKeyWorker(Worker):
+  def __init__(self):
+    super(ServiceKeyWorker, self).__init__()
+    self.add_operation(self._refresh_service_keys,
+                       app.config.get('INSTANCE_SERVICE_KEY_REFRESH', 60)*60)
+
+  def _refresh_service_keys(self):
+    """
+    Refreshes active service keys so they don't get garbage collected.
+    """
+    expiration = timedelta(minutes=instance_keys.service_key_expiration)
+    logger.debug('Starting refresh of automatic service keys')
+    set_key_expiration(instance_keys.local_key_id, datetime.now() + expiration)
+    logger.debug('Finished refresh of automatic service keys')
+
+if __name__ == "__main__":
+  worker = ServiceKeyWorker()
+  worker.start()