build.flow.MatchBase.__init__() - Code Metrics - Inspection of "Merge pull request #62 from gleybersonandrade/unit..." - kytos/of_core - Measure and Improve Code Quality continuously with Scrutinizer

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by Humberto

created 2020-04-02 17:17 UTC

build.flow.MatchBase.init() A

↳ Parent: build.flow

Complexity

Conditions

Size

Total Lines	16
Code Lines	14

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	12
CRAP Score	1

Importance

Changes

Metric	Value
cc	1
eloc	14
nop	12
dl	0
loc	16
ccs	12
cts	12
cp	1
crap	1
rs	9.7
c	0
b	0
f	0

How to fix Many Parameters

"""High-level abstraction for Flows of multiple OpenFlow versions.

Use common fields of FlowStats/FlowMod of supported OF versions. ``match`` and
``actions`` fields are different, so Flow, Action and Match related classes are
inherited in v0x01 and v0x04 modules.
"""
import json
from abc import ABC, abstractmethod
from hashlib import md5

# Note: FlowModCommand is the same in both v0x01 and v0x04
from pyof.v0x04.controller2switch.flow_mod import FlowModCommand

from napps.kytos.of_core import v0x01, v0x04


class FlowFactory(ABC):  # pylint: disable=too-few-public-methods
    """Choose the correct Flow according to OpenFlow version."""

    @classmethod
    def from_of_flow_stats(cls, of_flow_stats, switch):
        """Return a Flow for the switch OpenFlow version."""
        flow_class = cls.get_class(switch)
        return flow_class.from_of_flow_stats(of_flow_stats, switch)

    @staticmethod
    def get_class(switch):
        """Return the Flow class for the switch OF version."""
        of_version = switch.connection.protocol.version
        if of_version == 0x01:
            return v0x01.flow.Flow
        if of_version == 0x04:
            return v0x04.flow.Flow
        raise NotImplementedError(f'Unsupported OpenFlow version {of_version}')


class FlowBase(ABC):  # pylint: disable=too-many-instance-attributes
    """Class to abstract a Flow to switches.

    This class represents a Flow installed or to be installed inside the
    switch. A flow, in this case is represented by a Match object and a set of
    actions that should occur in case any match happen.
    """

    # of_version number: 0x01, 0x04
    of_version = None

    # Subclasses must set their version-specific classes
    _action_factory = None
    _flow_mod_class = None
    _match_class = None

    def __init__(self, switch, table_id=0xff, match=None, priority=0x8000,
                 idle_timeout=0, hard_timeout=0, cookie=0, actions=None,
                 stats=None):
        """Assign parameters to attributes.

        Args:
            switch (kytos.core.switch.Switch): Switch ID is used to uniquely
                identify a flow.
            table_id (int): The index of a single table or 0xff for all tables.
            match (|match|): Match object.
            priority (int): Priority level of flow entry.
            idle_timeout (int): Idle time before discarding, in seconds.
            hard_timeout (int): Max time before discarding, in seconds.
            cookie (int): Opaque controller-issued identifier.
            actions (|list_of_actions|): List of actions to apply.
            stats (Stats): Latest flow statistics.
        """
        # pylint: disable=too-many-arguments,too-many-locals
        self.switch = switch
        self.table_id = table_id
        # Disable not-callable error as subclasses set a class
        self.match = match or self._match_class()  # pylint: disable=E1102
        self.priority = priority
        self.idle_timeout = idle_timeout
        self.hard_timeout = hard_timeout
        self.cookie = cookie
        self.actions = actions or []
        self.stats = stats or FlowStats()  # pylint: disable=E1102

    @property
    def id(self):  # pylint: disable=invalid-name
        """Return this flow unique identifier.

        Calculate an md5 hash based on this object's modified json string. The
        json for ID calculation excludes ``stats`` attribute that changes over
        time.

        Returns:
            str: Flow unique identifier (md5sum).

        """
        flow_str = self.as_json(sort_keys=True, include_id=False)
        md5sum = md5()
        md5sum.update(flow_str.encode('utf-8'))
        return md5sum.hexdigest()

    def as_dict(self, include_id=True):
        """Return the Flow as a serializable Python dictionary.

        Args:
            include_id (bool): Default is ``True``. Internally, it is set to
                ``False`` when calculating the flow ID that is based in this
                dictionary's JSON string.

        Returns:
            dict: Serializable dictionary.

        """
        flow_dict = {
            'switch': self.switch.id,
            'table_id': self.table_id,
            'match': self.match.as_dict(),
            'priority': self.priority,
            'idle_timeout': self.idle_timeout,
            'hard_timeout': self.hard_timeout,
            'cookie': self.cookie,
            'actions': [action.as_dict() for action in self.actions]}
        if include_id:
            # Avoid infinite recursion
            flow_dict['id'] = self.id
            # Remove statistics that change over time
            flow_dict['stats'] = self.stats.as_dict()

        return flow_dict

    @classmethod
    def from_dict(cls, flow_dict, switch):
        """Return an instance with values from ``flow_dict``."""
        flow = cls(switch)

        # Set attributes found in ``flow_dict``
        for attr_name, attr_value in flow_dict.items():
            if attr_name in vars(flow):
                setattr(flow, attr_name, attr_value)

        flow.switch = switch
        if 'stats' in flow_dict:
            flow.stats = FlowStats.from_dict(flow_dict['stats'])

        # Version-specific attributes
        if 'match' in flow_dict:
            flow.match = cls._match_class.from_dict(flow_dict['match'])
        if 'actions' in flow_dict:
            flow.actions = []
            for action_dict in flow_dict['actions']:
                action = cls._action_factory.from_dict(action_dict)
                if action:
                    flow.actions.append(action)

        return flow

    def as_json(self, sort_keys=False, include_id=True):
        """Return the representation of a flow in JSON format.

        Args:
            sort_keys (bool): ``False`` by default (Python's default). Sorting
                is used, for example, to calculate the flow ID.
            include_id (bool): ``True`` by default. Internally, the ID is not
                included while calculating it.

        Returns:
            string: Flow JSON string representation.

        """
        return json.dumps(self.as_dict(include_id), sort_keys=sort_keys)

    def as_of_add_flow_mod(self):
        """Return an OpenFlow add FlowMod."""
        return self._as_of_flow_mod(FlowModCommand.OFPFC_ADD)

    def as_of_delete_flow_mod(self):
        """Return an OpenFlow delete FlowMod."""
        return self._as_of_flow_mod(FlowModCommand.OFPFC_DELETE)

    @abstractmethod
    def _as_of_flow_mod(self, command):
        """Return a pyof FlowMod with given ``command``."""
        # Disable not-callable error as subclasses will set a class
        flow_mod = self._flow_mod_class()  # pylint: disable=E1102
        flow_mod.match = self.match.as_of_match()
        flow_mod.cookie = self.cookie
        flow_mod.command = command
        flow_mod.idle_timeout = self.idle_timeout
        flow_mod.hard_timeout = self.hard_timeout
        flow_mod.priority = self.priority
        return flow_mod

    @staticmethod
    @abstractmethod
    def _get_of_actions(of_flow_stats):
        """Return pyof actions from pyof FlowStats."""

    @classmethod
    def from_of_flow_stats(cls, of_flow_stats, switch):
        """Create a flow with latest stats based on pyof FlowStats."""
        of_actions = cls._get_of_actions(of_flow_stats)
        actions = (cls._action_factory.from_of_action(of_action)

                   for of_action in of_actions)
        non_none_actions = [action for action in actions if action]
        return cls(switch,
                   table_id=of_flow_stats.table_id.value,
                   match=cls._match_class.from_of_match(of_flow_stats.match),
                   priority=of_flow_stats.priority.value,
                   idle_timeout=of_flow_stats.idle_timeout.value,
                   hard_timeout=of_flow_stats.hard_timeout.value,
                   cookie=of_flow_stats.cookie.value,
                   actions=non_none_actions,
                   stats=FlowStats.from_of_flow_stats(of_flow_stats))


class ActionBase(ABC):
    """Base class for a flow action."""

    def as_dict(self):
        """Return a dict that can be dumped as JSON."""
        return vars(self)

    @classmethod
    def from_dict(cls, action_dict):
        """Return an action instance from attributes in a dictionary."""
        action = cls(None)
        for attr_name, value in action_dict.items():
            if hasattr(action, attr_name):
                setattr(action, attr_name, value)
        return action

    @abstractmethod
    def as_of_action(self):
        """Return a pyof action to be used by a FlowMod."""

    @classmethod
    @abstractmethod
    def from_of_action(cls, of_action):
        """Return an action from a pyof action."""


class ActionFactoryBase(ABC):
    """Deal with different implementations of ActionBase."""

    # key: action_type or pyof class, value: ActionBase child
    _action_class = {
        'output': None,
        'set_vlan': None,
        # pyof class: ActionBase child
    }

    @classmethod
    def from_dict(cls, action_dict):
        """Build the proper Action from a dictionary.

        Args:
            action_dict (dict): Action attributes.
        """
        action_type = action_dict.get('action_type')
        action_class = cls._action_class[action_type]
        return action_class.from_dict(action_dict) if action_class else None

    @classmethod
    def from_of_action(cls, of_action):
        """Build the proper Action from a pyof action.

        Args:
            of_action (pyof action): Action from python-openflow.
        """
        of_class = type(of_action)
        action_class = cls._action_class.get(of_class)
        return action_class.from_of_action(of_action) if action_class else None


class MatchBase:  # pylint: disable=too-many-instance-attributes
    """Base class with common high-level Match fields."""

    def __init__(self, in_port=None, dl_src=None, dl_dst=None, dl_vlan=None,
                 dl_vlan_pcp=None, dl_type=None, nw_proto=None, nw_src=None,
                 nw_dst=None, tp_src=None, tp_dst=None):
        """Make it possible to set all attributes from the constructor."""
        # pylint: disable=too-many-arguments
        self.in_port = in_port
        self.dl_src = dl_src
        self.dl_dst = dl_dst
        self.dl_vlan = dl_vlan
        self.dl_vlan_pcp = dl_vlan_pcp
        self.dl_type = dl_type
        self.nw_proto = nw_proto
        self.nw_src = nw_src
        self.nw_dst = nw_dst
        self.tp_src = tp_src
        self.tp_dst = tp_dst

    def as_dict(self):
        """Return a dictionary excluding ``None`` values."""
        return {k: v for k, v in self.__dict__.items() if v is not None}

    @classmethod
    def from_dict(cls, match_dict):
        """Return a Match instance from a dictionary."""
        match = cls()
        for key, value in match_dict.items():
            if key in match.__dict__:
                setattr(match, key, value)
        return match

    @classmethod
    @abstractmethod
    def from_of_match(cls, of_match):
        """Return a Match instance from a pyof Match."""

    @abstractmethod
    def as_of_match(self):
        """Return a python-openflow Match."""


class Stats:
    """Simple class to store statistics as attributes and values."""

    def as_dict(self):
        """Return a dict excluding attributes with ``None`` value."""
        return {attribute: value
                for attribute, value in vars(self).items()
                if value is not None}

    @classmethod
    def from_dict(cls, stats_dict):
        """Return a statistics object from a dictionary."""
        stats = cls()
        cls._update(stats, stats_dict.items())
        return stats

    @classmethod
    def from_of_flow_stats(cls, of_stats):
        """Create an instance from a pyof FlowStats."""
        stats = cls()
        stats.update(of_stats)
        return stats

    def update(self, of_stats):
        """Given a pyof stats object, update attributes' values.

        Avoid object creation and memory leak. pyof values are GenericType
        instances whose native values can be accessed by `.value`.
        """
        # Generator for GenericType values
        attr_name_value = ((attr_name, gen_type.value)

                           for attr_name, gen_type in vars(of_stats).items()
                           if attr_name in vars(self))
        self._update(self, attr_name_value)

    @staticmethod
    def _update(obj, iterable):
        """From attribute name and value pairs, update ``obj``."""
        for attr_name, value in iterable:
            if hasattr(obj, attr_name):
                setattr(obj, attr_name, value)


class FlowStats(Stats):
    """Common fields for 1.0 and 1.3 FlowStats."""

    def __init__(self):
        """Initialize all statistics as ``None``."""
        self.byte_count = None
        self.duration_sec = None
        self.duration_nsec = None
        self.packet_count = None


class PortStats(Stats):  # pylint: disable=too-many-instance-attributes
    """Common fields for 1.0 and 1.3 PortStats."""

    def __init__(self):
        """Initialize all statistics as ``None``."""
        self.rx_packets = None
        self.tx_packets = None
        self.rx_bytes = None
        self.tx_bytes = None
        self.rx_dropped = None
        self.tx_dropped = None
        self.rx_errors = None
        self.tx_errors = None
        self.rx_frame_err = None
        self.rx_over_err = None
        self.rx_crc_err = None
        self.collisions = None


1		"""High-level abstraction for Flows of multiple OpenFlow versions.
2
3		Use common fields of FlowStats/FlowMod of supported OF versions. ``match`` and
4		``actions`` fields are different, so Flow, Action and Match related classes are
5		inherited in v0x01 and v0x04 modules.
6		"""
7	1	import json
8	1	from abc import ABC, abstractmethod
9	1	from hashlib import md5
10
11		# Note: FlowModCommand is the same in both v0x01 and v0x04
12	1	from pyof.v0x04.controller2switch.flow_mod import FlowModCommand
13
14	1	from napps.kytos.of_core import v0x01, v0x04
15
16
17	1	class FlowFactory(ABC): # pylint: disable=too-few-public-methods
18		"""Choose the correct Flow according to OpenFlow version."""
19
20	1	@classmethod
21		def from_of_flow_stats(cls, of_flow_stats, switch):
22		"""Return a Flow for the switch OpenFlow version."""
23		flow_class = cls.get_class(switch)
24		return flow_class.from_of_flow_stats(of_flow_stats, switch)
25
26	1	@staticmethod
27		def get_class(switch):
28		"""Return the Flow class for the switch OF version."""
29		of_version = switch.connection.protocol.version
30		if of_version == 0x01:
31		return v0x01.flow.Flow
32		if of_version == 0x04:
33		return v0x04.flow.Flow
34		raise NotImplementedError(f'Unsupported OpenFlow version {of_version}')
35
36
37	1	class FlowBase(ABC): # pylint: disable=too-many-instance-attributes
38		"""Class to abstract a Flow to switches.
39
40		This class represents a Flow installed or to be installed inside the
41		switch. A flow, in this case is represented by a Match object and a set of
42		actions that should occur in case any match happen.
43		"""
44
45		# of_version number: 0x01, 0x04
46	1	of_version = None
47
48		# Subclasses must set their version-specific classes
49	1	_action_factory = None
50	1	_flow_mod_class = None
51	1	_match_class = None
52
53	1	def __init__(self, switch, table_id=0xff, match=None, priority=0x8000,
54		idle_timeout=0, hard_timeout=0, cookie=0, actions=None,
55		stats=None):
56		"""Assign parameters to attributes.
57
58		Args:
59		switch (kytos.core.switch.Switch): Switch ID is used to uniquely
60		identify a flow.
61		table_id (int): The index of a single table or 0xff for all tables.
62		match (\|match\|): Match object.
63		priority (int): Priority level of flow entry.
64		idle_timeout (int): Idle time before discarding, in seconds.
65		hard_timeout (int): Max time before discarding, in seconds.
66		cookie (int): Opaque controller-issued identifier.
67		actions (\|list_of_actions\|): List of actions to apply.
68		stats (Stats): Latest flow statistics.
69		"""
70		# pylint: disable=too-many-arguments,too-many-locals
71	1	self.switch = switch
72	1	self.table_id = table_id
73		# Disable not-callable error as subclasses set a class
74	1	self.match = match or self._match_class() # pylint: disable=E1102
75	1	self.priority = priority
76	1	self.idle_timeout = idle_timeout
77	1	self.hard_timeout = hard_timeout
78	1	self.cookie = cookie
79	1	self.actions = actions or []
80	1	self.stats = stats or FlowStats() # pylint: disable=E1102
81
82	1	@property
83		def id(self): # pylint: disable=invalid-name
84		"""Return this flow unique identifier.
85
86		Calculate an md5 hash based on this object's modified json string. The
87		json for ID calculation excludes ``stats`` attribute that changes over
88		time.
89
90		Returns:
91		str: Flow unique identifier (md5sum).
92
93		"""
94	1	flow_str = self.as_json(sort_keys=True, include_id=False)
95	1	md5sum = md5()
96	1	md5sum.update(flow_str.encode('utf-8'))
97	1	return md5sum.hexdigest()
98
99	1	def as_dict(self, include_id=True):
100		"""Return the Flow as a serializable Python dictionary.
101
102		Args:
103		include_id (bool): Default is ``True``. Internally, it is set to
104		``False`` when calculating the flow ID that is based in this
105		dictionary's JSON string.
106
107		Returns:
108		dict: Serializable dictionary.
109
110		"""
111	1	flow_dict = {
112		'switch': self.switch.id,
113		'table_id': self.table_id,
114		'match': self.match.as_dict(),
115		'priority': self.priority,
116		'idle_timeout': self.idle_timeout,
117		'hard_timeout': self.hard_timeout,
118		'cookie': self.cookie,
119		'actions': [action.as_dict() for action in self.actions]}
120	1	if include_id:
121		# Avoid infinite recursion
122	1	flow_dict['id'] = self.id
123		# Remove statistics that change over time
124	1	flow_dict['stats'] = self.stats.as_dict()
125
126	1	return flow_dict
127
128	1	@classmethod
129		def from_dict(cls, flow_dict, switch):
130		"""Return an instance with values from ``flow_dict``."""
131	1	flow = cls(switch)
132
133		# Set attributes found in ``flow_dict``
134	1	for attr_name, attr_value in flow_dict.items():
135	1	if attr_name in vars(flow):
136	1	setattr(flow, attr_name, attr_value)
137
138	1	flow.switch = switch
139	1	if 'stats' in flow_dict:
140	1	flow.stats = FlowStats.from_dict(flow_dict['stats'])
141
142		# Version-specific attributes
143	1	if 'match' in flow_dict:
144	1	flow.match = cls._match_class.from_dict(flow_dict['match'])
145	1	if 'actions' in flow_dict:
146	1	flow.actions = []
147	1	for action_dict in flow_dict['actions']:
148	1	action = cls._action_factory.from_dict(action_dict)
149	1	if action:
150	1	flow.actions.append(action)
151
152	1	return flow
153
154	1	def as_json(self, sort_keys=False, include_id=True):
155		"""Return the representation of a flow in JSON format.
156
157		Args:
158		sort_keys (bool): ``False`` by default (Python's default). Sorting
159		is used, for example, to calculate the flow ID.
160		include_id (bool): ``True`` by default. Internally, the ID is not
161		included while calculating it.
162
163		Returns:
164		string: Flow JSON string representation.
165
166		"""
167	1	return json.dumps(self.as_dict(include_id), sort_keys=sort_keys)
168
169	1	def as_of_add_flow_mod(self):
170		"""Return an OpenFlow add FlowMod."""
171	1	return self._as_of_flow_mod(FlowModCommand.OFPFC_ADD)
172
173	1	def as_of_delete_flow_mod(self):
174		"""Return an OpenFlow delete FlowMod."""
175	1	return self._as_of_flow_mod(FlowModCommand.OFPFC_DELETE)
176
177	1	@abstractmethod
178		def _as_of_flow_mod(self, command):
179		"""Return a pyof FlowMod with given ``command``."""
180		# Disable not-callable error as subclasses will set a class
181	1	flow_mod = self._flow_mod_class() # pylint: disable=E1102
182	1	flow_mod.match = self.match.as_of_match()
183	1	flow_mod.cookie = self.cookie
184	1	flow_mod.command = command
185	1	flow_mod.idle_timeout = self.idle_timeout
186	1	flow_mod.hard_timeout = self.hard_timeout
187	1	flow_mod.priority = self.priority
188	1	return flow_mod
189
190	1	@staticmethod
191	1	@abstractmethod
192		def _get_of_actions(of_flow_stats):
193		"""Return pyof actions from pyof FlowStats."""
194
195	1	@classmethod
196		def from_of_flow_stats(cls, of_flow_stats, switch):
197		"""Create a flow with latest stats based on pyof FlowStats."""
198	1	of_actions = cls._get_of_actions(of_flow_stats)
199	1	actions = (cls._action_factory.from_of_action(of_action)
		0 ignored issues – show Comprehensibility Best Practice introduced 2019-02-18 13:53 UTC by Report Bug Copy Issue Report The variable `of_action` does not seem to be defined. Loading history...
200		for of_action in of_actions)
201	1	non_none_actions = [action for action in actions if action]
202	1	return cls(switch,
203		table_id=of_flow_stats.table_id.value,
204		match=cls._match_class.from_of_match(of_flow_stats.match),
205		priority=of_flow_stats.priority.value,
206		idle_timeout=of_flow_stats.idle_timeout.value,
207		hard_timeout=of_flow_stats.hard_timeout.value,
208		cookie=of_flow_stats.cookie.value,
209		actions=non_none_actions,
210		stats=FlowStats.from_of_flow_stats(of_flow_stats))
211
212
213	1	class ActionBase(ABC):
214		"""Base class for a flow action."""
215
216	1	def as_dict(self):
217		"""Return a dict that can be dumped as JSON."""
218	1	return vars(self)
219
220	1	@classmethod
221		def from_dict(cls, action_dict):
222		"""Return an action instance from attributes in a dictionary."""
223	1	action = cls(None)
224	1	for attr_name, value in action_dict.items():
225	1	if hasattr(action, attr_name):
226	1	setattr(action, attr_name, value)
227	1	return action
228
229	1	@abstractmethod
230		def as_of_action(self):
231		"""Return a pyof action to be used by a FlowMod."""
232
233	1	@classmethod
234	1	@abstractmethod
235		def from_of_action(cls, of_action):
236		"""Return an action from a pyof action."""
237
238
239	1	class ActionFactoryBase(ABC):
240		"""Deal with different implementations of ActionBase."""
241
242		# key: action_type or pyof class, value: ActionBase child
243	1	_action_class = {
244		'output': None,
245		'set_vlan': None,
246		# pyof class: ActionBase child
247		}
248
249	1	@classmethod
250		def from_dict(cls, action_dict):
251		"""Build the proper Action from a dictionary.
252
253		Args:
254		action_dict (dict): Action attributes.
255		"""
256	1	action_type = action_dict.get('action_type')
257	1	action_class = cls._action_class[action_type]
258	1	return action_class.from_dict(action_dict) if action_class else None
259
260	1	@classmethod
261		def from_of_action(cls, of_action):
262		"""Build the proper Action from a pyof action.
263
264		Args:
265		of_action (pyof action): Action from python-openflow.
266		"""
267	1	of_class = type(of_action)
268	1	action_class = cls._action_class.get(of_class)
269	1	return action_class.from_of_action(of_action) if action_class else None
270
271
272	1	class MatchBase: # pylint: disable=too-many-instance-attributes
273		"""Base class with common high-level Match fields."""
274
275	1	def __init__(self, in_port=None, dl_src=None, dl_dst=None, dl_vlan=None,
276		dl_vlan_pcp=None, dl_type=None, nw_proto=None, nw_src=None,
277		nw_dst=None, tp_src=None, tp_dst=None):
278		"""Make it possible to set all attributes from the constructor."""
279		# pylint: disable=too-many-arguments
280	1	self.in_port = in_port
281	1	self.dl_src = dl_src
282	1	self.dl_dst = dl_dst
283	1	self.dl_vlan = dl_vlan
284	1	self.dl_vlan_pcp = dl_vlan_pcp
285	1	self.dl_type = dl_type
286	1	self.nw_proto = nw_proto
287	1	self.nw_src = nw_src
288	1	self.nw_dst = nw_dst
289	1	self.tp_src = tp_src
290	1	self.tp_dst = tp_dst
291
292	1	def as_dict(self):
293		"""Return a dictionary excluding ``None`` values."""
294	1	return {k: v for k, v in self.__dict__.items() if v is not None}
295
296	1	@classmethod
297		def from_dict(cls, match_dict):
298		"""Return a Match instance from a dictionary."""
299	1	match = cls()
300	1	for key, value in match_dict.items():
301	1	if key in match.__dict__:
302	1	setattr(match, key, value)
303	1	return match
304
305	1	@classmethod
306	1	@abstractmethod
307		def from_of_match(cls, of_match):
308		"""Return a Match instance from a pyof Match."""
309
310	1	@abstractmethod
311		def as_of_match(self):
312		"""Return a python-openflow Match."""
313
314
315	1	class Stats:
316		"""Simple class to store statistics as attributes and values."""
317
318	1	def as_dict(self):
319		"""Return a dict excluding attributes with ``None`` value."""
320	1	return {attribute: value
321		for attribute, value in vars(self).items()
322		if value is not None}
323
324	1	@classmethod
325		def from_dict(cls, stats_dict):
326		"""Return a statistics object from a dictionary."""
327	1	stats = cls()
328	1	cls._update(stats, stats_dict.items())
329	1	return stats
330
331	1	@classmethod
332		def from_of_flow_stats(cls, of_stats):
333		"""Create an instance from a pyof FlowStats."""
334	1	stats = cls()
335	1	stats.update(of_stats)
336	1	return stats
337
338	1	def update(self, of_stats):
339		"""Given a pyof stats object, update attributes' values.
340
341		Avoid object creation and memory leak. pyof values are GenericType
342		instances whose native values can be accessed by `.value`.
343		"""
344		# Generator for GenericType values
345	1	attr_name_value = ((attr_name, gen_type.value)
		0 ignored issues – show Comprehensibility Best Practice introduced 2019-02-18 13:53 UTC by Report Bug Copy Issue Report The variable `gen_type` does not seem to be defined. Loading history... Comprehensibility Best Practice introduced 2019-02-18 13:53 UTC by Report Bug Copy Issue Report The variable `attr_name` does not seem to be defined. Loading history...
346		for attr_name, gen_type in vars(of_stats).items()
347		if attr_name in vars(self))
348	1	self._update(self, attr_name_value)
349
350	1	@staticmethod
351		def _update(obj, iterable):
352		"""From attribute name and value pairs, update ``obj``."""
353	1	for attr_name, value in iterable:
354	1	if hasattr(obj, attr_name):
355	1	setattr(obj, attr_name, value)
356
357
358	1	class FlowStats(Stats):
359		"""Common fields for 1.0 and 1.3 FlowStats."""
360
361	1	def __init__(self):
362		"""Initialize all statistics as ``None``."""
363	1	self.byte_count = None
364	1	self.duration_sec = None
365	1	self.duration_nsec = None
366	1	self.packet_count = None
367
368
369	1	class PortStats(Stats): # pylint: disable=too-many-instance-attributes
370		"""Common fields for 1.0 and 1.3 PortStats."""
371
372	1	def __init__(self):
373		"""Initialize all statistics as ``None``."""
374		self.rx_packets = None
375		self.tx_packets = None
376		self.rx_bytes = None
377		self.tx_bytes = None
378		self.rx_dropped = None
379		self.tx_dropped = None
380		self.rx_errors = None
381		self.tx_errors = None
382		self.rx_frame_err = None
383		self.rx_over_err = None
384		self.rx_crc_err = None
385		self.collisions = None
386

kytos / of_core

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