Handle SIGHUP in dhcp and l3 agents

All launchers implemented in common.service require each service to
implement reset method because it is called in case a process
receives a SIGHUP.

This change adds the reset method to neutron.service.Service class
which is used to start dhcp and l3 agents.

Now dhcp and l3 agents don't die on receiving SIGHUP and support
reloading policy_path and logging options in config.

Partial-Bug: #1276694
Change-Id: I96010e44928a665bea546865b2c81bde4ed0adf2

1 files changed, 5 insertions, 0 deletions

diff --git a/neutron/service.py b/neutron/service.py
index 448251c383..cc76c0ba97 100644
--- a/neutron/service.py
+++ b/neutron/service.py
@@ -32,6 +32,7 @@ from neutron.i18n import _LE, _LI
 from neutron import manager
 from neutron.openstack.common import loopingcall
 from neutron.openstack.common import service as common_service
+from neutron import policy
 from neutron import wsgi
 
 
@@ -286,6 +287,10 @@ class Service(n_rpc.Service):
             except Exception:
                 LOG.exception(_LE("Exception occurs when waiting for timer"))
 
+    def reset(self):
+        config.setup_logging()
+        policy.refresh()
+
     def periodic_tasks(self, raise_on_error=False):
         """Tasks to be run at a periodic interval."""
         ctxt = context.get_admin_context()