build.flow.MatchBase.__init__() - Code Metrics - Inspection of "Add OpenFlow 1.3 match fields" - kytos/of_core - Measure and Improve Code Quality continuously with Scrutinizer

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Pull Request — master (#84)

unknown

created 2020-06-29 22:16 UTC

build.flow.MatchBase.init() A

↳ Parent: build.flow

Complexity

Conditions

Size

Total Lines	38
Code Lines	35

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	1
CRAP Score	1.8966

Importance

Changes

Metric	Value
eloc	35
dl	0
loc	38
ccs	1
cts	28
cp	0.0357
rs	9.0399
c	0
b	0
f	0
cc	1
nop	28
crap	1.8966

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, in_phy_port=None,
                 ip_dscp=None, ip_ecn=None, udp_src=None, udp_dst=None,
                 icmpv4_type=None, icmpv4_code=None, arp_op=None,
                 ipv6_flabel=None, icmpv6_type=None, icmpv6_code=None,
                 nd_tar=None, nd_sll=None, nd_tll=None, pbb_isid=None,
                 v6_hdr=None):
        """Make it possible to set all attributes from the constructor."""
        # pylint: disable=too-many-arguments
        # pylint: disable=too-many-locals
        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
        self.in_phy_port = in_phy_port
        self.ip_dscp = ip_dscp
        self.ip_ecn = ip_ecn
        self.udp_src = udp_src
        self.udp_dst = udp_dst
        self.icmpv4_type = icmpv4_type
        self.icmpv4_code = icmpv4_code
        self.arp_op = arp_op
        self.ipv6_flabel = ipv6_flabel
        self.icmpv6_type = icmpv6_type
        self.icmpv6_code = icmpv6_code
        self.nd_tar = nd_tar
        self.nd_sll = nd_sll
        self.nd_tll = nd_tll
        self.pbb_isid = pbb_isid
        self.v6_hdr = v6_hdr

    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		self.switch = switch
72		self.table_id = table_id
73		# Disable not-callable error as subclasses set a class
74		self.match = match or self._match_class() # pylint: disable=E1102
75		self.priority = priority
76		self.idle_timeout = idle_timeout
77		self.hard_timeout = hard_timeout
78		self.cookie = cookie
79		self.actions = actions or []
80		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		flow_str = self.as_json(sort_keys=True, include_id=False)
95		md5sum = md5()
96		md5sum.update(flow_str.encode('utf-8'))
97		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		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		if include_id:
121		# Avoid infinite recursion
122		flow_dict['id'] = self.id
123		# Remove statistics that change over time
124		flow_dict['stats'] = self.stats.as_dict()
125
126		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		flow = cls(switch)
132
133		# Set attributes found in ``flow_dict``
134		for attr_name, attr_value in flow_dict.items():
135		if attr_name in vars(flow):
136		setattr(flow, attr_name, attr_value)
137
138		flow.switch = switch
139		if 'stats' in flow_dict:
140		flow.stats = FlowStats.from_dict(flow_dict['stats'])
141
142		# Version-specific attributes
143		if 'match' in flow_dict:
144		flow.match = cls._match_class.from_dict(flow_dict['match'])
145		if 'actions' in flow_dict:
146		flow.actions = []
147		for action_dict in flow_dict['actions']:
148		action = cls._action_factory.from_dict(action_dict)
149		if action:
150		flow.actions.append(action)
151
152		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		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		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		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		flow_mod = self._flow_mod_class() # pylint: disable=E1102
182		flow_mod.match = self.match.as_of_match()
183		flow_mod.cookie = self.cookie
184		flow_mod.command = command
185		flow_mod.idle_timeout = self.idle_timeout
186		flow_mod.hard_timeout = self.hard_timeout
187		flow_mod.priority = self.priority
188		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		of_actions = cls._get_of_actions(of_flow_stats)
199		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		non_none_actions = [action for action in actions if action]
202		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		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		action = cls(None)
224		for attr_name, value in action_dict.items():
225		if hasattr(action, attr_name):
226		setattr(action, attr_name, value)
227		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		action_type = action_dict.get('action_type')
257		action_class = cls._action_class[action_type]
258		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		of_class = type(of_action)
268		action_class = cls._action_class.get(of_class)
269		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, in_phy_port=None,
278		ip_dscp=None, ip_ecn=None, udp_src=None, udp_dst=None,
279		icmpv4_type=None, icmpv4_code=None, arp_op=None,
280		ipv6_flabel=None, icmpv6_type=None, icmpv6_code=None,
281		nd_tar=None, nd_sll=None, nd_tll=None, pbb_isid=None,
282		v6_hdr=None):
283		"""Make it possible to set all attributes from the constructor."""
284		# pylint: disable=too-many-arguments
285		# pylint: disable=too-many-locals
286		self.in_port = in_port
287		self.dl_src = dl_src
288		self.dl_dst = dl_dst
289		self.dl_vlan = dl_vlan
290		self.dl_vlan_pcp = dl_vlan_pcp
291		self.dl_type = dl_type
292		self.nw_proto = nw_proto
293		self.nw_src = nw_src
294		self.nw_dst = nw_dst
295		self.tp_src = tp_src
296		self.tp_dst = tp_dst
297		self.in_phy_port = in_phy_port
298		self.ip_dscp = ip_dscp
299		self.ip_ecn = ip_ecn
300		self.udp_src = udp_src
301		self.udp_dst = udp_dst
302		self.icmpv4_type = icmpv4_type
303		self.icmpv4_code = icmpv4_code
304		self.arp_op = arp_op
305		self.ipv6_flabel = ipv6_flabel
306		self.icmpv6_type = icmpv6_type
307		self.icmpv6_code = icmpv6_code
308		self.nd_tar = nd_tar
309		self.nd_sll = nd_sll
310		self.nd_tll = nd_tll
311		self.pbb_isid = pbb_isid
312		self.v6_hdr = v6_hdr
313
314	1	def as_dict(self):
315		"""Return a dictionary excluding ``None`` values."""
316		return {k: v for k, v in self.__dict__.items() if v is not None}
317
318	1	@classmethod
319		def from_dict(cls, match_dict):
320		"""Return a Match instance from a dictionary."""
321		match = cls()
322		for key, value in match_dict.items():
323		if key in match.__dict__:
324		setattr(match, key, value)
325		return match
326
327	1	@classmethod
328	1	@abstractmethod
329		def from_of_match(cls, of_match):
330		"""Return a Match instance from a pyof Match."""
331
332	1	@abstractmethod
333		def as_of_match(self):
334		"""Return a python-openflow Match."""
335
336
337	1	class Stats:
338		"""Simple class to store statistics as attributes and values."""
339
340	1	def as_dict(self):
341		"""Return a dict excluding attributes with ``None`` value."""
342		return {attribute: value
343		for attribute, value in vars(self).items()
344		if value is not None}
345
346	1	@classmethod
347		def from_dict(cls, stats_dict):
348		"""Return a statistics object from a dictionary."""
349		stats = cls()
350		cls._update(stats, stats_dict.items())
351		return stats
352
353	1	@classmethod
354		def from_of_flow_stats(cls, of_stats):
355		"""Create an instance from a pyof FlowStats."""
356		stats = cls()
357		stats.update(of_stats)
358		return stats
359
360	1	def update(self, of_stats):
361		"""Given a pyof stats object, update attributes' values.
362
363		Avoid object creation and memory leak. pyof values are GenericType
364		instances whose native values can be accessed by `.value`.
365		"""
366		# Generator for GenericType values
367		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...
368		for attr_name, gen_type in vars(of_stats).items()
369		if attr_name in vars(self))
370		self._update(self, attr_name_value)
371
372	1	@staticmethod
373		def _update(obj, iterable):
374		"""From attribute name and value pairs, update ``obj``."""
375		for attr_name, value in iterable:
376		if hasattr(obj, attr_name):
377		setattr(obj, attr_name, value)
378
379
380	1	class FlowStats(Stats):
381		"""Common fields for 1.0 and 1.3 FlowStats."""
382
383	1	def __init__(self):
384		"""Initialize all statistics as ``None``."""
385		self.byte_count = None
386		self.duration_sec = None
387		self.duration_nsec = None
388		self.packet_count = None
389
390
391	1	class PortStats(Stats): # pylint: disable=too-many-instance-attributes
392		"""Common fields for 1.0 and 1.3 PortStats."""
393
394	1	def __init__(self):
395		"""Initialize all statistics as ``None``."""
396		self.rx_packets = None
397		self.tx_packets = None
398		self.rx_bytes = None
399		self.tx_bytes = None
400		self.rx_dropped = None
401		self.tx_dropped = None
402		self.rx_errors = None
403		self.tx_errors = None
404		self.rx_frame_err = None
405		self.rx_over_err = None
406		self.rx_crc_err = None
407		self.collisions = None
408

kytos / of_core

Pull Request — master (#84)

build.flow.MatchBase.__init__() A

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