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# Copyright 2022-2025 ETSI SDG TeraFlowSDN (TFS) (https://tfs.etsi.org/)
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#
# 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.
# See usage example below
import logging, queue, threading, time
from typing import Any, Callable, Optional
from common.proto.context_pb2 import DeviceEvent, Empty, EventTypeEnum, LinkEvent
from common.tools.grpc.BaseEventCollector import BaseEventCollector
from common.tools.grpc.Tools import grpc_message_to_json_string
from context.client.ContextClient import ContextClient
LOGGER = logging.getLogger(__name__)
class BaseEventDispatcher(threading.Thread):
def __init__(
self, events_queue : queue.PriorityQueue,
terminate : Optional[threading.Event] = None
) -> None:
super().__init__(daemon=True)
self._events_queue = events_queue
self._terminate = threading.Event() if terminate is None else terminate
def stop(self):
self._terminate.set()
def _get_event(self, block : bool = True, timeout : Optional[float] = 0.5) -> Optional[Any]:
try:
_, event = self._events_queue.get(block=block, timeout=timeout)
return event
except queue.Empty:
return None
def _get_dispatcher(self, event : Any) -> Optional[Callable]:
object_name = str(event.__class__.__name__).lower().replace('event', '')
event_type = event.event.event_type
event_type = EventTypeEnum.Name(event_type)
event_type = event_type.lower().replace('eventtype_', '')
method_name = 'dispatch_{:s}_{:s}'.format(object_name, event_type)
dispatcher = getattr(self, method_name, None)
if dispatcher is not None: return dispatcher
method_name = 'dispatch_{:s}'.format(object_name)
dispatcher = getattr(self, method_name, None)
if dispatcher is not None: return dispatcher
method_name = 'dispatch'
dispatcher = getattr(self, method_name, None)
if dispatcher is not None: return dispatcher
return None
def run(self) -> None:
while not self._terminate.is_set():
event = self._get_event()
if event is None: continue
object_name = str(event.__class__.__name__)
object_name = object_name.lower().replace('event', '')
if object_name == 'any':
field_name = event.WhichOneof('event')
event = getattr(event, field_name)
event_type = event.event.event_type
event_type = EventTypeEnum.Name(event_type)
event_type = event_type.lower().replace('eventtype_', '')
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dispatcher = self._get_dispatcher(event)
if dispatcher is None:
MSG = 'No dispatcher available for Event({:s})'
LOGGER.warning(MSG.format(grpc_message_to_json_string(event)))
continue
dispatcher(event)
class MyEventDispatcher(BaseEventDispatcher):
def dispatch_device_create(self, device_event : DeviceEvent) -> None:
MSG = 'Processing Device Create: {:s}'
LOGGER.info(MSG.format(grpc_message_to_json_string(device_event)))
def dispatch_device_update(self, device_event : DeviceEvent) -> None:
MSG = 'Processing Device Update: {:s}'
LOGGER.info(MSG.format(grpc_message_to_json_string(device_event)))
def dispatch_device_remove(self, device_event : DeviceEvent) -> None:
MSG = 'Processing Device Remove: {:s}'
LOGGER.info(MSG.format(grpc_message_to_json_string(device_event)))
def dispatch_link(self, link_event : LinkEvent) -> None:
MSG = 'Processing Link Create/Update/Remove: {:s}'
LOGGER.info(MSG.format(grpc_message_to_json_string(link_event)))
def dispatch(self, event : Any) -> None:
MSG = 'Processing any other Event: {:s}'
LOGGER.info(MSG.format(grpc_message_to_json_string(event)))
def main() -> None:
logging.basicConfig(level=logging.INFO)
context_client = ContextClient()
context_client.connect()
event_collector = BaseEventCollector()
event_collector.install_collector(context_client.GetDeviceEvents, Empty(), log_events_received=True)
event_collector.install_collector(context_client.GetLinkEvents, Empty(), log_events_received=True)
event_collector.install_collector(context_client.GetServiceEvents, Empty(), log_events_received=True)
event_collector.start()
event_dispatcher = MyEventDispatcher(event_collector.get_events_queue())
event_dispatcher.start()
time.sleep(60)
event_dispatcher.stop()
event_collector.stop()
context_client.close()
if __name__ == '__main__':
main()