256 lines
8 KiB
Python
256 lines
8 KiB
Python
import logging
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from queue import Empty, Queue
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from typing import Iterable
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from core.api.grpc import core_pb2
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from core.api.grpc.grpcutils import convert_value
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from core.emulator.data import (
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ConfigData,
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EventData,
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ExceptionData,
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FileData,
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LinkData,
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NodeData,
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)
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from core.emulator.session import Session
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def handle_node_event(event: NodeData) -> core_pb2.NodeEvent:
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"""
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Handle node event when there is a node event
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:param event: node data
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:return: node event that contains node id, name, model, position, and services
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"""
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position = core_pb2.Position(x=event.x_position, y=event.y_position)
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services = event.services or ""
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services = services.split("|")
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node_proto = core_pb2.Node(
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id=event.id,
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name=event.name,
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model=event.model,
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position=position,
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services=services,
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)
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return core_pb2.NodeEvent(node=node_proto, source=event.source)
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def handle_link_event(event: LinkData) -> core_pb2.LinkEvent:
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"""
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Handle link event when there is a link event
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:param event: link data
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:return: link event that has message type and link information
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"""
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interface_one = None
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if event.interface1_id is not None:
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interface_one = core_pb2.Interface(
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id=event.interface1_id,
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name=event.interface1_name,
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mac=convert_value(event.interface1_mac),
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ip4=convert_value(event.interface1_ip4),
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ip4mask=event.interface1_ip4_mask,
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ip6=convert_value(event.interface1_ip6),
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ip6mask=event.interface1_ip6_mask,
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)
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interface_two = None
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if event.interface2_id is not None:
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interface_two = core_pb2.Interface(
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id=event.interface2_id,
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name=event.interface2_name,
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mac=convert_value(event.interface2_mac),
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ip4=convert_value(event.interface2_ip4),
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ip4mask=event.interface2_ip4_mask,
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ip6=convert_value(event.interface2_ip6),
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ip6mask=event.interface2_ip6_mask,
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)
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options = core_pb2.LinkOptions(
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opaque=event.opaque,
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jitter=event.jitter,
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key=event.key,
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mburst=event.mburst,
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mer=event.mer,
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per=event.per,
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bandwidth=event.bandwidth,
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burst=event.burst,
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delay=event.delay,
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dup=event.dup,
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unidirectional=event.unidirectional,
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)
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link = core_pb2.Link(
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type=event.link_type,
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node_one_id=event.node1_id,
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node_two_id=event.node2_id,
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interface_one=interface_one,
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interface_two=interface_two,
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options=options,
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)
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return core_pb2.LinkEvent(message_type=event.message_type, link=link)
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def handle_session_event(event: EventData) -> core_pb2.SessionEvent:
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"""
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Handle session event when there is a session event
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:param event: event data
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:return: session event
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"""
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event_time = event.time
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if event_time is not None:
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event_time = float(event_time)
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return core_pb2.SessionEvent(
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node_id=event.node,
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event=event.event_type,
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name=event.name,
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data=event.data,
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time=event_time,
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)
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def handle_config_event(event: ConfigData) -> core_pb2.ConfigEvent:
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"""
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Handle configuration event when there is configuration event
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:param event: configuration data
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:return: configuration event
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"""
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return core_pb2.ConfigEvent(
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message_type=event.message_type,
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node_id=event.node,
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object=event.object,
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type=event.type,
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captions=event.captions,
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bitmap=event.bitmap,
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data_values=event.data_values,
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possible_values=event.possible_values,
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groups=event.groups,
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interface=event.interface_number,
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network_id=event.network_id,
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opaque=event.opaque,
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data_types=event.data_types,
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)
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def handle_exception_event(event: ExceptionData) -> core_pb2.ExceptionEvent:
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"""
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Handle exception event when there is exception event
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:param event: exception data
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:return: exception event
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"""
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return core_pb2.ExceptionEvent(
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node_id=event.node,
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level=event.level.value,
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source=event.source,
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date=event.date,
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text=event.text,
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opaque=event.opaque,
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)
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def handle_file_event(event: FileData) -> core_pb2.FileEvent:
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"""
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Handle file event
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:param event: file data
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:return: file event
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"""
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return core_pb2.FileEvent(
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message_type=event.message_type,
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node_id=event.node,
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name=event.name,
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mode=event.mode,
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number=event.number,
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type=event.type,
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source=event.source,
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data=event.data,
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compressed_data=event.compressed_data,
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)
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class EventStreamer:
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"""
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Processes session events to generate grpc events.
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"""
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def __init__(
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self, session: Session, event_types: Iterable[core_pb2.EventType]
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) -> None:
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"""
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Create a EventStreamer instance.
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:param session: session to process events for
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:param event_types: types of events to process
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"""
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self.session = session
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self.event_types = event_types
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self.queue = Queue()
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self.add_handlers()
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def add_handlers(self) -> None:
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"""
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Add a session event handler for desired event types.
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:return: nothing
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"""
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if core_pb2.EventType.NODE in self.event_types:
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self.session.node_handlers.append(self.queue.put)
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if core_pb2.EventType.LINK in self.event_types:
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self.session.link_handlers.append(self.queue.put)
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if core_pb2.EventType.CONFIG in self.event_types:
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self.session.config_handlers.append(self.queue.put)
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if core_pb2.EventType.FILE in self.event_types:
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self.session.file_handlers.append(self.queue.put)
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if core_pb2.EventType.EXCEPTION in self.event_types:
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self.session.exception_handlers.append(self.queue.put)
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if core_pb2.EventType.SESSION in self.event_types:
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self.session.event_handlers.append(self.queue.put)
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def process(self) -> core_pb2.Event:
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"""
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Process the next event in the queue.
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:return: grpc event, or None when invalid event or queue timeout
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"""
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event = core_pb2.Event(session_id=self.session.id)
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try:
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data = self.queue.get(timeout=1)
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if isinstance(data, NodeData):
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event.node_event.CopyFrom(handle_node_event(data))
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elif isinstance(data, LinkData):
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event.link_event.CopyFrom(handle_link_event(data))
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elif isinstance(data, EventData):
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event.session_event.CopyFrom(handle_session_event(data))
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elif isinstance(data, ConfigData):
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event.config_event.CopyFrom(handle_config_event(data))
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elif isinstance(data, ExceptionData):
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event.exception_event.CopyFrom(handle_exception_event(data))
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elif isinstance(data, FileData):
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event.file_event.CopyFrom(handle_file_event(data))
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else:
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logging.error("unknown event: %s", data)
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event = None
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except Empty:
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event = None
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return event
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def remove_handlers(self) -> None:
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"""
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Remove session event handlers for events being watched.
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:return: nothing
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"""
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if core_pb2.EventType.NODE in self.event_types:
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self.session.node_handlers.remove(self.queue.put)
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if core_pb2.EventType.LINK in self.event_types:
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self.session.link_handlers.remove(self.queue.put)
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if core_pb2.EventType.CONFIG in self.event_types:
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self.session.config_handlers.remove(self.queue.put)
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if core_pb2.EventType.FILE in self.event_types:
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self.session.file_handlers.remove(self.queue.put)
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if core_pb2.EventType.EXCEPTION in self.event_types:
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self.session.exception_handlers.remove(self.queue.put)
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if core_pb2.EventType.SESSION in self.event_types:
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self.session.event_handlers.remove(self.queue.put)
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