Add support for adjusting etcd ttl on job_heartbeat. Switch the heartbeat method to a coroutine.

buildman/server.py

@@ -24,6 +24,8 @@ MINIMUM_JOB_EXTENSION = timedelta(minutes=2)
 WEBSOCKET_PORT = 8787
 CONTROLLER_PORT = 8686
 
+HEARTBEAT_PERIOD_SEC = 30
+
 class BuildJobResult(object):
   """ Build job result enum """
   INCOMPLETE = 'incomplete'
@@ -52,6 +54,7 @@ class BuilderServer(object):
         self._job_heartbeat,
         self._job_complete,
         manager_public_ip,
+        HEARTBEAT_PERIOD_SEC,
     )
     self._lifecycle_manager_config = lifecycle_manager_config
 
@@ -140,7 +143,8 @@ class BuilderServer(object):
   @trollius.coroutine
   def _work_checker(self):
     while self._current_status == 'running':
-      logger.debug('Checking for more work for %d active workers', self._lifecycle_manager.num_workers())
+      logger.debug('Checking for more work for %d active workers',
+                   self._lifecycle_manager.num_workers())
       job_item = self._queue.get(processing_time=self._lifecycle_manager.setup_time())
       if job_item is None:
         logger.debug('No additional work found. Going to sleep for %s seconds', WORK_CHECK_TIMEOUT)