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"""Response the stat request packet from the controller.""" |
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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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from pyof.v0x01.common.header import Header, Type |
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from pyof.v0x01.controller2switch.common import DescStats, StatsTypes |
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__all__ = ('StatsReply',) |
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class StatsReply(GenericMessage): |
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"""Class implements the response to the stats request.""" |
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#: OpenFlow :class:`~pyof.v0x01.common.header.Header` |
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header = Header(message_type=Type.OFPT_STATS_REPLY) |
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body_type = UBInt16(enum_ref=StatsTypes) |
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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=None, body=b''): |
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"""The constructor just assigns parameters to object attributes. |
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Args: |
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body_type (StatsTypes): 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 a StatsReply using the object's attributes. |
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This method will pack the attribute body and body_type before pack the |
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StatsReply object, then will return this struct as a binary data. |
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Returns: |
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bytes: Binary data with StatsReply packed. |
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""" |
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buff = self.body |
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if not value: |
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value = self.body |
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if value and hasattr(value, 'pack'): |
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self.body = BinaryData(value.pack()) |
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stats_reply_packed = super().pack() |
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self.body = buff |
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return stats_reply_packed |
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def unpack(self, buff, offset=0): |
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"""Unpack a binary message into this object's attributes. |
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Unpack the binary value *buff* and update this object attributes based |
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on the results. It is an inplace method and it receives the binary data |
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of the message **without the header**. |
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This class' unpack method is like the :meth:`.GenericMessage.unpack` |
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one, except for the ``body`` attribute which has its type determined |
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by the ``body_type`` attribute. |
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Args: |
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buff (bytes): Binary data package to be unpacked, without the |
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header. |
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""" |
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super().unpack(buff[offset:]) |
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self._unpack_body() |
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def _unpack_body(self): |
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"""Unpack `body` replace it by the result.""" |
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obj = self._get_body_instance() |
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obj.unpack(self.body.value) |
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self.body = obj |
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def _get_body_instance(self): |
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"""Method used to return the body instance.""" |
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pyof_class = self._get_body_class() |
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if pyof_class is None: |
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return BinaryData(b'') |
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elif pyof_class is DescStats: |
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return pyof_class() |
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return FixedTypeList(pyof_class=pyof_class) |
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def _get_body_class(self): |
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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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body_name = self.body_type.name.replace('OFPST_', '').title() |
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module = import_module('pyof.v0x01.controller2switch.common') |
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for class_name in module.__all__: |
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if 'Request' not 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
