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core: Add RereadConfiguration event. Signal SIGHUP fires it. #105

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core: Add RereadConfiguration event. Signal SIGHUP fires it. #105

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19 changes: 18 additions & 1 deletion pox/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ class (an instance of which is available as pox.core.core).
import inspect
import time
import os
import signal

_path = inspect.stack()[0][1]
_ext_path = _path[0:_path.rindex(os.sep)]
Expand Down Expand Up @@ -152,6 +153,10 @@ def __init__ (self, name, component):
self.name = name
self.component = component

class RereadConfiguration (Event):
""" Fired when modules should reread their configuration files. """
pass

import pox.lib.recoco as recoco

class POXCore (EventMixin):
Expand Down Expand Up @@ -179,7 +184,8 @@ class POXCore (EventMixin):
DownEvent,
GoingUpEvent,
GoingDownEvent,
ComponentRegistered
ComponentRegistered,
RereadConfiguration
])

version = (0,3,0)
Expand Down Expand Up @@ -317,6 +323,15 @@ def _get_platform_info (self):
except:
return "Unknown Platform"

def _add_signal_handlers (self):
try:
signal.signal(signal.SIGHUP, self._handler_signal_SIGHUP)
except ValueError:
log.warn('failed to install handler SIGHUP')

def _handler_signal_SIGHUP (self, signal, frame):
self.raiseLater(core, RereadConfiguration)

def goUp (self):
log.debug(self.version_string + " going up...")

Expand All @@ -337,6 +352,8 @@ def goUp (self):
self.starting_up = False
self.raiseEvent(GoingUpEvent())

self._add_signal_handlers()

self.raiseEvent(UpEvent())

self._waiter_notify()
Expand Down