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"""The controller has requested to be notified when flows time out."""
# System imports
from enum import Enum
# Local source tree imports
from pyof.v0x01.common.flow_match import Match
from pyof.v0x01.common.header import Header, Type
from pyof.v0x01.foundation.base import GenericMessage
from pyof.v0x01.foundation.basic_types import (PAD, UBInt8, UBInt16, UBInt32,
UBInt64)
__all__ = ('FlowRemoved', 'FlowRemovedReason')
# Enums
class FlowRemovedReason(Enum):
"""Why the flow was removed."""
#: Flow idle time exceeded idle_timeout
OFPRR_IDLE_TIMEOUT = 0
#: Time exceeded hard_timeout
OFPRR_HARD_TIMEOUT = 1
#: Evicted by a DELETE flow mod
OFPRR_DELETE = 2
# Classes
class FlowRemoved(GenericMessage):
"""Flow removed (datapath -> controller)."""
#: :class:`~.header.Header`: OpenFlow Header
header = Header(message_type=Type.OFPT_FLOW_REMOVED)
#: :class:`~.flow_match.Match`: OpenFlow Header
match = Match()
cookie = UBInt64()
priority = UBInt16()
reason = UBInt8(enum_ref=FlowRemovedReason)
#: Align to 32-bits.
pad = PAD(1)
duration_sec = UBInt32()
duration_nsec = UBInt32()
idle_timeout = UBInt16()
#: Align to 64-bits.
pad2 = PAD(2)
packet_count = UBInt64()
byte_count = UBInt64()
def __init__(self, xid=None, match=None, cookie=None, priority=None,
reason=None, duration_sec=None, duration_nsec=None,
idle_timeout=None, packet_count=None, byte_count=None):
"""Assign parameters to object attributes.
Args:
xid (int): OpenFlow Header's xid.
match (Match): Fields' description.
cookie (int): Opaque controller-issued identifier.
priority (int): Priority level of flow entry.
reason (FlowRemovedReason): Why the flow was removed.
duration_sec (int): Time the flow was alive in seconds.
duration_nsec (int): Time the flow was alive in nanoseconds in
addition to duration_sec.
idle_timeout (int): Idle timeout from original flow mod.
packet_count (int): Number of packets.
byte_count (int): Byte count.
"""
super().__init__(xid)
self.match = match
self.cookie = cookie
self.priority = priority
self.reason = reason
self.duration_sec = duration_sec
self.duration_nsec = duration_nsec
self.idle_timeout = idle_timeout
self.packet_count = packet_count
self.byte_count = byte_count
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