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"""Query the datapath about its current state.""" |
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# System imports |
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# Third-party imports |
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from importlib import import_module |
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from pyof.foundation.base import GenericMessage |
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from pyof.foundation.basic_types import BinaryData, FixedTypeList, UBInt16 |
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# Local imports |
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from pyof.v0x01.common.header import Header, Type |
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from pyof.v0x01.controller2switch.common import StatsType |
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__all__ = ('StatsRequest',) |
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class StatsRequest(GenericMessage): |
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"""Request statistics to switch.""" |
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#: OpenFlow :class:`~pyof.v0x01.common.header.Header` |
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header = Header(message_type=Type.OFPT_STATS_REQUEST) |
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body_type = UBInt16(enum_ref=StatsType) |
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flags = UBInt16() |
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body = BinaryData() |
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def __init__(self, xid=None, body_type=None, flags=0, body=b''): |
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"""Create a StatsRequest with the optional parameters below. |
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Args: |
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xid (int): xid to be used on the message header. |
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body_type (StatsType): One of the OFPST_* constants. |
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flags (int): OFPSF_REQ_* flags (none yet defined). |
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body (BinaryData): Body of the request. |
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""" |
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super().__init__(xid) |
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self.body_type = body_type |
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self.flags = flags |
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self.body = body |
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def pack(self, value=None): |
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"""Pack according to :attr:`body_type`. |
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Make `body` a binary pack before packing this object. Then, restore |
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body. |
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""" |
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backup = self.body |
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if not value: |
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value = self.body |
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if hasattr(value, 'pack'): |
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self.body = value.pack() |
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stats_request_packed = super().pack() |
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self.body = backup |
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return stats_request_packed |
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def unpack(self, buff, offset=0): |
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"""Unpack according to :attr:`body_type`.""" |
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super().unpack(buff) |
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class_name = self._get_body_class() |
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buff = self.body.value |
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self.body = FixedTypeList(pyof_class=class_name) |
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self.body.unpack(buff) |
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View Code Duplication |
def _get_body_class(self): |
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68
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if isinstance(self.body_type, (int, UBInt16)): |
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self.body_type = self.body_type.enum_ref(self.body_type.value) |
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module = import_module('pyof.v0x01.controller2switch.common') |
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body_name = self.body_type.name.replace('OFPST_', '').title() |
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for class_name in module.__all__: |
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if 'Request' in class_name and body_name in class_name: |
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return getattr(module, class_name) |
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return None |
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kytos /
python-openflow
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