def start(self, address):
LOG.debug('TopologyWatcher: start')
self.address = address
self.tc = TopologyClient(address)
self.is_active = True
self.threads.append(gevent.spawn(self._polling_loop))
def start(self, address):
LOG.debug('TopologyWatcher: start')
self.address = address
self.tc = TopologyClient(address)
self.is_active = True
self.threads.append(gevent.spawn(self._polling_loop))
class TopologyWatcher(object):
_LOOP_WAIT = 3
_REST_RETRY_WAIT = 10
def __init__(self, update_handler=None, rest_error_handler=None):
self.update_handler = update_handler
self.rest_error_handler = rest_error_handler
self.address = None
self.tc = None
self.threads = []
self.topo = Topology()
self.prev_switches_json = ''
self.prev_links_json = ''
def start(self, address):
LOG.debug('TopologyWatcher: start')
self.address = address
self.tc = TopologyClient(address)
self.is_active = True
self.threads.append(gevent.spawn(self._polling_loop))
def stop(self):
LOG.debug('TopologyWatcher: stop')
self.is_active = False
def _polling_loop(self):
LOG.debug('TopologyWatcher: Enter polling loop')
while self.is_active:
try:
switches_json = self.tc.list_switches().read()
links_json = self.tc.list_links().read()
except (SocketError, HTTPException) as e:
LOG.debug('TopologyWatcher: REST API(%s) is not avaliable.' %
self.address)
LOG.debug(' wait %d secs...' %
self._REST_RETRY_WAIT)
self._call_rest_error_handler(e)
gevent.sleep(self._REST_RETRY_WAIT)
continue
if self._is_updated(switches_json, links_json):
LOG.debug('TopologyWatcher: topology updated')
new_topo = Topology(switches_json, links_json)
delta = new_topo - self.topo
self.topo = new_topo
self._call_update_handler(delta)
gevent.sleep(self._LOOP_WAIT)
def _is_updated(self, switches_json, links_json):
updated = (
self.prev_switches_json != switches_json or
self.prev_links_json != links_json)
self.prev_switches_json = switches_json
self.prev_links_json = links_json
return updated
def _call_rest_error_handler(self, e):
if self.rest_error_handler:
self.rest_error_handler(self.address, e)
def _call_update_handler(self, delta):
if self.update_handler:
self.update_handler(self.address, delta)
class TopologyWatcher(object):
_LOOP_WAIT = 3
_REST_RETRY_WAIT = 10
def __init__(self, update_handler=None, rest_error_handler=None):
self.update_handler = update_handler
self.rest_error_handler = rest_error_handler
self.address = None
self.tc = None
self.threads = []
self.topo = Topology()
self.prev_switches_json = ''
self.prev_links_json = ''
def start(self, address):
LOG.debug('TopologyWatcher: start')
self.address = address
self.tc = TopologyClient(address)
self.is_active = True
self.threads.append(gevent.spawn(self._polling_loop))
def stop(self):
LOG.debug('TopologyWatcher: stop')
self.is_active = False
def _polling_loop(self):
LOG.debug('TopologyWatcher: Enter polling loop')
while self.is_active:
try:
switches_json = self.tc.list_switches().read()
links_json = self.tc.list_links().read()
except (SocketError, HTTPException) as e:
LOG.debug('TopologyWatcher: REST API(%s) is not avaliable.' %
self.address)
LOG.debug(' wait %d secs...' % self._REST_RETRY_WAIT)
self._call_rest_error_handler(e)
gevent.sleep(self._REST_RETRY_WAIT)
continue
if self._is_updated(switches_json, links_json):
LOG.debug('TopologyWatcher: topology updated')
new_topo = Topology(switches_json, links_json)
delta = new_topo - self.topo
self.topo = new_topo
self._call_update_handler(delta)
gevent.sleep(self._LOOP_WAIT)
def _is_updated(self, switches_json, links_json):
updated = (self.prev_switches_json != switches_json
or self.prev_links_json != links_json)
self.prev_switches_json = switches_json
self.prev_links_json = links_json
return updated
def _call_rest_error_handler(self, e):
if self.rest_error_handler:
self.rest_error_handler(self.address, e)
def _call_update_handler(self, delta):
if self.update_handler:
self.update_handler(self.address, delta)
