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# Copyright (C) 2017 Nippon Telegraph and Telephone Corporation.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
OpenFlow related APIs of os_ken.controller module.
"""
import netaddr
from os_ken.base import app_manager
from os_ken.lib import hub
from os_ken.lib import ip
from . import ofp_event
_TMP_ADDRESSES = {}
def register_switch_address(addr, interval=None):
"""
Registers a new address to initiate connection to switch.
Registers a new IP address and port pair of switch to let
os_ken.controller.controller.OpenFlowController to try to initiate
connection to switch.
:param addr: A tuple of (host, port) pair of switch.
:param interval: Interval in seconds to try to connect to switch
"""
assert len(addr) == 2
assert ip.valid_ipv4(addr[0]) or ip.valid_ipv6(addr[0])
ofp_handler = app_manager.lookup_service_brick(ofp_event.NAME)
_TMP_ADDRESSES[addr] = interval
def _retry_loop():
# Delays registration if ofp_handler is not started yet
while True:
if ofp_handler is not None and ofp_handler.controller is not None:
for a, i in _TMP_ADDRESSES.items():
ofp_handler.controller.spawn_client_loop(a, i)
hub.sleep(1)
break
hub.sleep(1)
hub.spawn(_retry_loop)
def unregister_switch_address(addr):
"""
Unregister the given switch address.
Unregisters the given switch address to let
os_ken.controller.controller.OpenFlowController stop trying to initiate
connection to switch.
:param addr: A tuple of (host, port) pair of switch.
"""
ofp_handler = app_manager.lookup_service_brick(ofp_event.NAME)
# Do nothing if ofp_handler is not started yet
if ofp_handler is None or ofp_handler.controller is None:
return
ofp_handler.controller.stop_client_loop(addr)
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