build.main.Main.notify_lldp_change() - Code Metrics - Inspection of "[Feature] Added more logs when pushing flows and a..." - kytos-ng/of_lldp - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#29)

by Vinicius

created 2021-12-13 20:42 UTC

build.main.Main.notify_lldp_change() A

↳ Parent: build.main

Complexity

Conditions

Size

Total Lines	8
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	4
CRAP Score	1

Importance

Changes

Metric	Value
cc	1
eloc	7
nop	3
dl	0
loc	8
ccs	4
cts	4
cp	1
crap	1
rs	10
c	0
b	0
f	0

"""NApp responsible to discover new switches and hosts."""
import struct
import time

import requests
from flask import jsonify, request
from pyof.foundation.basic_types import DPID, UBInt16, UBInt32
from pyof.foundation.network_types import LLDP, VLAN, Ethernet, EtherType
from pyof.v0x01.common.action import ActionOutput as AO10
from pyof.v0x01.common.phy_port import Port as Port10
from pyof.v0x01.controller2switch.packet_out import PacketOut as PO10
from pyof.v0x04.common.action import ActionOutput as AO13
from pyof.v0x04.common.port import PortNo as Port13
from pyof.v0x04.controller2switch.packet_out import PacketOut as PO13

from kytos.core import KytosEvent, KytosNApp, log, rest
from kytos.core.helpers import listen_to
from napps.kytos.of_lldp import constants, settings


class Main(KytosNApp):
    """Main OF_LLDP NApp Class."""

    def setup(self):
        """Make this NApp run in a loop."""
        self.vlan_id = None
        self.polling_time = settings.POLLING_TIME
        if hasattr(settings, "FLOW_VLAN_VID"):
            self.vlan_id = settings.FLOW_VLAN_VID
        self.execute_as_loop(self.polling_time)

    def execute(self):
        """Send LLDP Packets every 'POLLING_TIME' seconds to all switches."""
        switches = list(self.controller.switches.values())
        for switch in switches:
            try:
                of_version = switch.connection.protocol.version
            except AttributeError:
                of_version = None

            if not switch.is_connected():
                continue

            if of_version == 0x01:
                port_type = UBInt16
                local_port = Port10.OFPP_LOCAL
            elif of_version == 0x04:
                port_type = UBInt32
                local_port = Port13.OFPP_LOCAL
            else:
                # skip the current switch with unsupported OF version
                continue

            interfaces = list(switch.interfaces.values())
            for interface in interfaces:
                # Interface marked to receive lldp packet
                # Only send LLDP packet to active interface
                if(not interface.lldp or not interface.is_active()
                   or not interface.is_enabled()):
                    continue
                # Avoid the interface that connects to the controller.
                if interface.port_number == local_port:
                    continue

                lldp = LLDP()
                lldp.chassis_id.sub_value = DPID(switch.dpid)
                lldp.port_id.sub_value = port_type(interface.port_number)

                ethernet = Ethernet()
                ethernet.ether_type = EtherType.LLDP
                ethernet.source = interface.address
                ethernet.destination = constants.LLDP_MULTICAST_MAC
                ethernet.data = lldp.pack()
                # self.vlan_id == None will result in a packet with no VLAN.
                ethernet.vlans.append(VLAN(vid=self.vlan_id))

                packet_out = self._build_lldp_packet_out(
                                    of_version,
                                    interface.port_number, ethernet.pack())

                if packet_out is None:
                    continue

                event_out = KytosEvent(
                    name='kytos/of_lldp.messages.out.ofpt_packet_out',
                    content={
                            'destination': switch.connection,
                            'message': packet_out})
                self.controller.buffers.msg_out.put(event_out)
                log.debug(
                    "Sending a LLDP PacketOut to the switch %s",
                    switch.dpid)

                msg = 'Switch: %s (%s)'
                msg += ' Interface: %s'
                msg += ' -- LLDP PacketOut --'
                msg += ' Ethernet: eth_type (%s) | src (%s) | dst (%s) /'
                msg += ' LLDP: Switch (%s) | portno (%s)'

                log.debug(
                    msg,
                    switch.connection, switch.dpid,
                    interface.id, ethernet.ether_type,
                    ethernet.source, ethernet.destination,
                    switch.dpid, interface.port_number)

    @listen_to('kytos/topology.switch.(enabled|disabled)')
    def handle_lldp_flows(self, event):
        """Install or remove flows in a switch.

        Install a flow to send LLDP packets to the controller. The proactive
        flow is installed whenever a switch is enabled. If the switch is
        disabled the flow is removed.

        Args:
            event (:class:`~kytos.core.events.KytosEvent`):
                Event with new switch information.

        """
        try:
            dpid = event.content['dpid']
            switch = self.controller.get_switch_by_dpid(dpid)
            of_version = switch.connection.protocol.version

        except AttributeError:
            of_version = None

        def _retry_if_status_code(response, endpoint, data, status_codes,
                                  retries=3, wait=2):
            """Retry if the response is in the status_codes."""
            if response.status_code not in status_codes:
                return
            if retries - 1 <= 0:
                return
            data = dict(data)
            data["force"] = True
            res = requests.post(endpoint, json=data)
            method = res.request.method
            if res.status_code != 202:
                log.error(f"Failed to retry on {endpoint}, error: {res.text},"
                          f" status: {res.status_code}, method: {method},"
                          f" data: {data}")
                time.sleep(wait)
                return _retry_if_status_code(response, endpoint, data,
                                             status_codes, retries - 1, wait)
            log.info(f"Successfully forced {method} flows to {endpoint}")

        flow = self._build_lldp_flow(of_version)
        if flow:
            destination = switch.id
            endpoint = f'{settings.FLOW_MANAGER_URL}/flows/{destination}'
            data = {'flows': [flow]}
            if event.name == 'kytos/topology.switch.enabled':
                res = requests.post(endpoint, json=data)
                if res.status_code != 202:
                    log.error(f"Failed to push flows on {destination},"
                              f" error: {res.text}, status: {res.status_code},"
                              f" data: {data}")
                _retry_if_status_code(res, endpoint, data, [424])
            else:
                res = requests.delete(endpoint, json=data)
                if res.status_code != 202:
                    log.error(f"Failed to delete flows on {destination},"
                              f" error: {res.text}, status: {res.status_code}",
                              f" data: {data}")
                _retry_if_status_code(res, endpoint, data, [424])

    @listen_to('kytos/of_core.v0x0[14].messages.in.ofpt_packet_in')
    def notify_uplink_detected(self, event):
        """Dispatch two KytosEvents to notify identified NNI interfaces.

        Args:
            event (:class:`~kytos.core.events.KytosEvent`):
                Event with an LLDP packet as data.

        """
        ethernet = self._unpack_non_empty(Ethernet, event.message.data)
        if ethernet.ether_type == EtherType.LLDP:
            try:
                lldp = self._unpack_non_empty(LLDP, ethernet.data)
                dpid = self._unpack_non_empty(DPID, lldp.chassis_id.sub_value)
            except struct.error:
                #: If we have a LLDP packet but we cannot unpack it, or the
                #: unpacked packet does not contain the dpid attribute, then
                #: we are dealing with a LLDP generated by someone else. Thus
                #: this packet is not useful for us and we may just ignore it.
                return

            switch_a = event.source.switch
            port_a = event.message.in_port
            switch_b = None
            port_b = None

            # in_port is currently a UBInt16 in v0x01 and an Int in v0x04.
            if isinstance(port_a, int):
                port_a = UBInt32(port_a)

            try:
                switch_b = self.controller.get_switch_by_dpid(dpid.value)
                of_version = switch_b.connection.protocol.version
                port_type = UBInt16 if of_version == 0x01 else UBInt32
                port_b = self._unpack_non_empty(port_type,
                                                lldp.port_id.sub_value)
            except AttributeError:
                log.debug("Couldn't find datapath %s.", dpid.value)

            # Return if any of the needed information are not available
            if not (switch_a and port_a and switch_b and port_b):
                return

            interface_a = switch_a.get_interface_by_port_no(port_a.value)
            interface_b = switch_b.get_interface_by_port_no(port_b.value)

            event_out = KytosEvent(name='kytos/of_lldp.interface.is.nni',
                                   content={'interface_a': interface_a,
                                            'interface_b': interface_b})
            self.controller.buffers.app.put(event_out)

    def notify_lldp_change(self, state, interface_ids):
        """Dispatch a KytosEvent to notify changes to the LLDP status."""
        content = {'attribute': 'LLDP',
                   'state': state,
                   'interface_ids': interface_ids}
        event_out = KytosEvent(name='kytos/of_lldp.network_status.updated',
                               content=content)
        self.controller.buffers.app.put(event_out)

    def shutdown(self):
        """End of the application."""
        log.debug('Shutting down...')

    @staticmethod
    def _build_lldp_packet_out(version, port_number, data):
        """Build a LLDP PacketOut message.

        Args:
            version (int): OpenFlow version
            port_number (int): Switch port number where the packet must be
                forwarded to.
            data (bytes): Binary data to be sent through the port.

        Returns:
            PacketOut message for the specific given OpenFlow version, if it
                is supported.
            None if the OpenFlow version is not supported.

        """
        if version == 0x01:
            action_output_class = AO10
            packet_out_class = PO10
        elif version == 0x04:
            action_output_class = AO13
            packet_out_class = PO13
        else:
            log.info('Openflow version %s is not yet supported.', version)
            return None

        output_action = action_output_class()
        output_action.port = port_number

        packet_out = packet_out_class()
        packet_out.data = data
        packet_out.actions.append(output_action)

        return packet_out

    def _build_lldp_flow(self, version):
        """Build a Flow message to send LLDP to the controller.

        Args:
            version (int): OpenFlow version.

        Returns:
            Flow dictionary message for the specific given OpenFlow version,
            if it is supported.
            None if the OpenFlow version is not supported.

        """
        flow = {}
        match = {}
        flow['priority'] = settings.FLOW_PRIORITY
        flow['table_id'] = settings.TABLE_ID
        match['dl_type'] = EtherType.LLDP
        if self.vlan_id:
            match['dl_vlan'] = self.vlan_id
        flow['match'] = match

        if version == 0x01:
            flow['actions'] = [{'action_type': 'output',
                                'port': Port10.OFPP_CONTROLLER}]
        elif version == 0x04:
            flow['actions'] = [{'action_type': 'output',
                                'port': Port13.OFPP_CONTROLLER}]
        else:
            flow = None

        return flow

    @staticmethod
    def _unpack_non_empty(desired_class, data):
        """Unpack data using an instance of desired_class.

        Args:
            desired_class (class): The class to be used to unpack data.
            data (bytes): bytes to be unpacked.

        Return:
            An instance of desired_class class with data unpacked into it.

        Raises:
            UnpackException if the unpack could not be performed.

        """
        obj = desired_class()

        if hasattr(data, 'value'):
            data = data.value

        obj.unpack(data)

        return obj

    @staticmethod
    def _get_data(req):
        """Get request data."""
        data = req.get_json()  # Valid format { "interfaces": [...] }
        return data.get('interfaces', [])

    def _get_interfaces(self):
        """Get all interfaces."""
        interfaces = []
        for switch in list(self.controller.switches.values()):
            interfaces += list(switch.interfaces.values())
        return interfaces

    @staticmethod
    def _get_interfaces_dict(interfaces):
        """Return a dict of interfaces."""
        return {inter.id: inter for inter in interfaces}

    def _get_lldp_interfaces(self):
        """Get interfaces enabled to receive LLDP packets."""
        return [inter.id for inter in self._get_interfaces() if inter.lldp]

    @rest('v1/interfaces', methods=['GET'])
    def get_lldp_interfaces(self):
        """Return all the interfaces that have LLDP traffic enabled."""
        return jsonify({"interfaces": self._get_lldp_interfaces()}), 200

    @rest('v1/interfaces/disable', methods=['POST'])

    def disable_lldp(self):
        """Disables an interface to receive LLDP packets."""
        interface_ids = self._get_data(request)
        error_list = []  # List of interfaces that were not activated.
        changed_interfaces = []
        interface_ids = filter(None, interface_ids)
        interfaces = self._get_interfaces()
        if not interfaces:
            return jsonify("No interfaces were found."), 404
        interfaces = self._get_interfaces_dict(interfaces)
        for id_ in interface_ids:
            interface = interfaces.get(id_)
            if interface:
                interface.lldp = False
                changed_interfaces.append(id_)
            else:
                error_list.append(id_)
        if changed_interfaces:
            self.notify_lldp_change('disabled', changed_interfaces)
        if not error_list:
            return jsonify(
                "All the requested interfaces have been disabled."), 200

        # Return a list of interfaces that couldn't be disabled
        msg_error = "Some interfaces couldn't be found and deactivated: "
        return jsonify({msg_error:
                        error_list}), 400

    @rest('v1/interfaces/enable', methods=['POST'])

    def enable_lldp(self):
        """Enable an interface to receive LLDP packets."""
        interface_ids = self._get_data(request)
        error_list = []  # List of interfaces that were not activated.
        changed_interfaces = []
        interface_ids = filter(None, interface_ids)
        interfaces = self._get_interfaces()
        if not interfaces:
            return jsonify("No interfaces were found."), 404
        interfaces = self._get_interfaces_dict(interfaces)
        for id_ in interface_ids:
            interface = interfaces.get(id_)
            if interface:
                interface.lldp = True
                changed_interfaces.append(id_)
            else:
                error_list.append(id_)
        if changed_interfaces:
            self.notify_lldp_change('enabled', changed_interfaces)
        if not error_list:
            return jsonify(
                "All the requested interfaces have been enabled."), 200

        # Return a list of interfaces that couldn't be enabled
        msg_error = "Some interfaces couldn't be found and activated: "
        return jsonify({msg_error:
                        error_list}), 400

    @rest('v1/polling_time', methods=['GET'])
    def get_time(self):
        """Get LLDP polling time in seconds."""
        return jsonify({"polling_time": self.polling_time}), 200

    @rest('v1/polling_time', methods=['POST'])
    def set_time(self):
        """Set LLDP polling time."""
        # pylint: disable=attribute-defined-outside-init
        try:
            payload = request.get_json()
            polling_time = int(payload['polling_time'])
            if polling_time <= 0:
                raise ValueError(f"invalid polling_time {polling_time}, "
                                 "must be greater than zero")
            self.polling_time = polling_time
            self.execute_as_loop(self.polling_time)
            log.info("Polling time has been updated to %s"
                     " second(s), but this change will not be saved"
                     " permanently.", self.polling_time)
            return jsonify("Polling time has been updated."), 200
        except (ValueError, KeyError) as error:
            msg = f"This operation is not completed: {error}"
            return jsonify(msg), 400


1			"""NApp responsible to discover new switches and hosts."""
2	1		import struct
3	1		import time
4
5	1		import requests
6	1		from flask import jsonify, request
7	1		from pyof.foundation.basic_types import DPID, UBInt16, UBInt32
8	1		from pyof.foundation.network_types import LLDP, VLAN, Ethernet, EtherType
9	1		from pyof.v0x01.common.action import ActionOutput as AO10
10	1		from pyof.v0x01.common.phy_port import Port as Port10
11	1		from pyof.v0x01.controller2switch.packet_out import PacketOut as PO10
12	1		from pyof.v0x04.common.action import ActionOutput as AO13
13	1		from pyof.v0x04.common.port import PortNo as Port13
14	1		from pyof.v0x04.controller2switch.packet_out import PacketOut as PO13
15
16	1		from kytos.core import KytosEvent, KytosNApp, log, rest
17	1		from kytos.core.helpers import listen_to
18	1		from napps.kytos.of_lldp import constants, settings
19
20
21	1		class Main(KytosNApp):
22			"""Main OF_LLDP NApp Class."""
23
24	1		def setup(self):
25			"""Make this NApp run in a loop."""
26	1		self.vlan_id = None
27	1		self.polling_time = settings.POLLING_TIME
28	1		if hasattr(settings, "FLOW_VLAN_VID"):
29	1		self.vlan_id = settings.FLOW_VLAN_VID
30	1		self.execute_as_loop(self.polling_time)
31
32	1		def execute(self):
33			"""Send LLDP Packets every 'POLLING_TIME' seconds to all switches."""
34	1		switches = list(self.controller.switches.values())
35	1		for switch in switches:
36	1		try:
37	1		of_version = switch.connection.protocol.version
38			except AttributeError:
39			of_version = None
40
41	1		if not switch.is_connected():
42			continue
43
44	1		if of_version == 0x01:
45	1		port_type = UBInt16
46	1		local_port = Port10.OFPP_LOCAL
47	1		elif of_version == 0x04:
48	1		port_type = UBInt32
49	1		local_port = Port13.OFPP_LOCAL
50			else:
51			# skip the current switch with unsupported OF version
52			continue
53
54	1		interfaces = list(switch.interfaces.values())
55	1		for interface in interfaces:
56			# Interface marked to receive lldp packet
57			# Only send LLDP packet to active interface
58	1		if(not interface.lldp or not interface.is_active()
59			or not interface.is_enabled()):
60			continue
61			# Avoid the interface that connects to the controller.
62	1		if interface.port_number == local_port:
63			continue
64
65	1		lldp = LLDP()
66	1		lldp.chassis_id.sub_value = DPID(switch.dpid)
67	1		lldp.port_id.sub_value = port_type(interface.port_number)
68
69	1		ethernet = Ethernet()
70	1		ethernet.ether_type = EtherType.LLDP
71	1		ethernet.source = interface.address
72	1		ethernet.destination = constants.LLDP_MULTICAST_MAC
73	1		ethernet.data = lldp.pack()
74			# self.vlan_id == None will result in a packet with no VLAN.
75	1		ethernet.vlans.append(VLAN(vid=self.vlan_id))
76
77	1		packet_out = self._build_lldp_packet_out(
78			of_version,
79			interface.port_number, ethernet.pack())
80
81	1		if packet_out is None:
82			continue
83
84	1		event_out = KytosEvent(
85			name='kytos/of_lldp.messages.out.ofpt_packet_out',
86			content={
87			'destination': switch.connection,
88			'message': packet_out})
89	1		self.controller.buffers.msg_out.put(event_out)
90	1		log.debug(
91			"Sending a LLDP PacketOut to the switch %s",
92			switch.dpid)
93
94	1		msg = 'Switch: %s (%s)'
95	1		msg += ' Interface: %s'
96	1		msg += ' -- LLDP PacketOut --'
97	1		msg += ' Ethernet: eth_type (%s) \| src (%s) \| dst (%s) /'
98	1		msg += ' LLDP: Switch (%s) \| portno (%s)'
99
100	1		log.debug(
101			msg,
102			switch.connection, switch.dpid,
103			interface.id, ethernet.ether_type,
104			ethernet.source, ethernet.destination,
105			switch.dpid, interface.port_number)
106
107	1		@listen_to('kytos/topology.switch.(enabled\|disabled)')
108			def handle_lldp_flows(self, event):
109			"""Install or remove flows in a switch.
110
111			Install a flow to send LLDP packets to the controller. The proactive
112			flow is installed whenever a switch is enabled. If the switch is
113			disabled the flow is removed.
114
115			Args:
116			event (:class:`~kytos.core.events.KytosEvent`):
117			Event with new switch information.
118
119			"""
120	1		try:
121	1		dpid = event.content['dpid']
122	1		switch = self.controller.get_switch_by_dpid(dpid)
123	1		of_version = switch.connection.protocol.version
124
125			except AttributeError:
126			of_version = None
127
128	1		def _retry_if_status_code(response, endpoint, data, status_codes,
129			retries=3, wait=2):
130			"""Retry if the response is in the status_codes."""
131	1		if response.status_code not in status_codes:
132	1		return
133			if retries - 1 <= 0:
134			return
135			data = dict(data)
136			data["force"] = True
137			res = requests.post(endpoint, json=data)
138			method = res.request.method
139			if res.status_code != 202:
140			log.error(f"Failed to retry on {endpoint}, error: {res.text},"
141			f" status: {res.status_code}, method: {method},"
142			f" data: {data}")
143			time.sleep(wait)
144			return _retry_if_status_code(response, endpoint, data,
145			status_codes, retries - 1, wait)
146			log.info(f"Successfully forced {method} flows to {endpoint}")
147
148	1		flow = self._build_lldp_flow(of_version)
149	1		if flow:
150	1		destination = switch.id
151	1		endpoint = f'{settings.FLOW_MANAGER_URL}/flows/{destination}'
152	1		data = {'flows': [flow]}
153	1		if event.name == 'kytos/topology.switch.enabled':
154	1		res = requests.post(endpoint, json=data)
155	1		if res.status_code != 202:
156	1		log.error(f"Failed to push flows on {destination},"
157			f" error: {res.text}, status: {res.status_code},"
158			f" data: {data}")
159	1		_retry_if_status_code(res, endpoint, data, [424])
160			else:
161	1		res = requests.delete(endpoint, json=data)
162	1		if res.status_code != 202:
163	1		log.error(f"Failed to delete flows on {destination},"
164			f" error: {res.text}, status: {res.status_code}",
165			f" data: {data}")
166			_retry_if_status_code(res, endpoint, data, [424])
167
168	1		@listen_to('kytos/of_core.v0x0[14].messages.in.ofpt_packet_in')
169			def notify_uplink_detected(self, event):
170			"""Dispatch two KytosEvents to notify identified NNI interfaces.
171
172			Args:
173			event (:class:`~kytos.core.events.KytosEvent`):
174			Event with an LLDP packet as data.
175
176			"""
177	1		ethernet = self._unpack_non_empty(Ethernet, event.message.data)
178	1		if ethernet.ether_type == EtherType.LLDP:
179	1		try:
180	1		lldp = self._unpack_non_empty(LLDP, ethernet.data)
181	1		dpid = self._unpack_non_empty(DPID, lldp.chassis_id.sub_value)
182			except struct.error:
183			#: If we have a LLDP packet but we cannot unpack it, or the
184			#: unpacked packet does not contain the dpid attribute, then
185			#: we are dealing with a LLDP generated by someone else. Thus
186			#: this packet is not useful for us and we may just ignore it.
187			return
188
189	1		switch_a = event.source.switch
190	1		port_a = event.message.in_port
191	1		switch_b = None
192	1		port_b = None
193
194			# in_port is currently a UBInt16 in v0x01 and an Int in v0x04.
195	1		if isinstance(port_a, int):
196	1		port_a = UBInt32(port_a)
197
198	1		try:
199	1		switch_b = self.controller.get_switch_by_dpid(dpid.value)
200	1		of_version = switch_b.connection.protocol.version
201	1		port_type = UBInt16 if of_version == 0x01 else UBInt32
202	1		port_b = self._unpack_non_empty(port_type,
203			lldp.port_id.sub_value)
204			except AttributeError:
205			log.debug("Couldn't find datapath %s.", dpid.value)
206
207			# Return if any of the needed information are not available
208	1		if not (switch_a and port_a and switch_b and port_b):
209			return
210
211	1		interface_a = switch_a.get_interface_by_port_no(port_a.value)
212	1		interface_b = switch_b.get_interface_by_port_no(port_b.value)
213
214	1		event_out = KytosEvent(name='kytos/of_lldp.interface.is.nni',
215			content={'interface_a': interface_a,
216			'interface_b': interface_b})
217	1		self.controller.buffers.app.put(event_out)
218
219	1		def notify_lldp_change(self, state, interface_ids):
220			"""Dispatch a KytosEvent to notify changes to the LLDP status."""
221	1		content = {'attribute': 'LLDP',
222			'state': state,
223			'interface_ids': interface_ids}
224	1		event_out = KytosEvent(name='kytos/of_lldp.network_status.updated',
225			content=content)
226	1		self.controller.buffers.app.put(event_out)
227
228	1		def shutdown(self):
229			"""End of the application."""
230			log.debug('Shutting down...')
231
232	1		@staticmethod
233			def _build_lldp_packet_out(version, port_number, data):
234			"""Build a LLDP PacketOut message.
235
236			Args:
237			version (int): OpenFlow version
238			port_number (int): Switch port number where the packet must be
239			forwarded to.
240			data (bytes): Binary data to be sent through the port.
241
242			Returns:
243			PacketOut message for the specific given OpenFlow version, if it
244			is supported.
245			None if the OpenFlow version is not supported.
246
247			"""
248	1		if version == 0x01:
249	1		action_output_class = AO10
250	1		packet_out_class = PO10
251	1		elif version == 0x04:
252	1		action_output_class = AO13
253	1		packet_out_class = PO13
254			else:
255	1		log.info('Openflow version %s is not yet supported.', version)
256	1		return None
257
258	1		output_action = action_output_class()
259	1		output_action.port = port_number
260
261	1		packet_out = packet_out_class()
262	1		packet_out.data = data
263	1		packet_out.actions.append(output_action)
264
265	1		return packet_out
266
267	1		def _build_lldp_flow(self, version):
268			"""Build a Flow message to send LLDP to the controller.
269
270			Args:
271			version (int): OpenFlow version.
272
273			Returns:
274			Flow dictionary message for the specific given OpenFlow version,
275			if it is supported.
276			None if the OpenFlow version is not supported.
277
278			"""
279	1		flow = {}
280	1		match = {}
281	1		flow['priority'] = settings.FLOW_PRIORITY
282	1		flow['table_id'] = settings.TABLE_ID
283	1		match['dl_type'] = EtherType.LLDP
284	1		if self.vlan_id:
285	1		match['dl_vlan'] = self.vlan_id
286	1		flow['match'] = match
287
288	1		if version == 0x01:
289	1		flow['actions'] = [{'action_type': 'output',
290			'port': Port10.OFPP_CONTROLLER}]
291	1		elif version == 0x04:
292	1		flow['actions'] = [{'action_type': 'output',
293			'port': Port13.OFPP_CONTROLLER}]
294			else:
295			flow = None
296
297	1		return flow
298
299	1		@staticmethod
300			def _unpack_non_empty(desired_class, data):
301			"""Unpack data using an instance of desired_class.
302
303			Args:
304			desired_class (class): The class to be used to unpack data.
305			data (bytes): bytes to be unpacked.
306
307			Return:
308			An instance of desired_class class with data unpacked into it.
309
310			Raises:
311			UnpackException if the unpack could not be performed.
312
313			"""
314	1		obj = desired_class()
315
316	1		if hasattr(data, 'value'):
317	1		data = data.value
318
319	1		obj.unpack(data)
320
321	1		return obj
322
323	1		@staticmethod
324			def _get_data(req):
325			"""Get request data."""
326	1		data = req.get_json() # Valid format { "interfaces": [...] }
327	1		return data.get('interfaces', [])
328
329	1		def _get_interfaces(self):
330			"""Get all interfaces."""
331	1		interfaces = []
332	1		for switch in list(self.controller.switches.values()):
333	1		interfaces += list(switch.interfaces.values())
334	1		return interfaces
335
336	1		@staticmethod
337			def _get_interfaces_dict(interfaces):
338			"""Return a dict of interfaces."""
339	1		return {inter.id: inter for inter in interfaces}
340
341	1		def _get_lldp_interfaces(self):
342			"""Get interfaces enabled to receive LLDP packets."""
343	1		return [inter.id for inter in self._get_interfaces() if inter.lldp]
344
345	1		@rest('v1/interfaces', methods=['GET'])
346			def get_lldp_interfaces(self):
347			"""Return all the interfaces that have LLDP traffic enabled."""
348	1		return jsonify({"interfaces": self._get_lldp_interfaces()}), 200
349
350	1	View Code Duplication	@rest('v1/interfaces/disable', methods=['POST'])
			0 ignored issues – show Duplication introduced 2021-11-30 20:15 UTC by Report Bug Copy Issue Report This code seems to be duplicated in your project. Loading history...
351			def disable_lldp(self):
352			"""Disables an interface to receive LLDP packets."""
353	1		interface_ids = self._get_data(request)
354	1		error_list = [] # List of interfaces that were not activated.
355	1		changed_interfaces = []
356	1		interface_ids = filter(None, interface_ids)
357	1		interfaces = self._get_interfaces()
358	1		if not interfaces:
359	1		return jsonify("No interfaces were found."), 404
360	1		interfaces = self._get_interfaces_dict(interfaces)
361	1		for id_ in interface_ids:
362	1		interface = interfaces.get(id_)
363	1		if interface:
364	1		interface.lldp = False
365	1		changed_interfaces.append(id_)
366			else:
367	1		error_list.append(id_)
368	1		if changed_interfaces:
369	1		self.notify_lldp_change('disabled', changed_interfaces)
370	1		if not error_list:
371	1		return jsonify(
372			"All the requested interfaces have been disabled."), 200
373
374			# Return a list of interfaces that couldn't be disabled
375	1		msg_error = "Some interfaces couldn't be found and deactivated: "
376	1		return jsonify({msg_error:
377			error_list}), 400
378
379	1	View Code Duplication	@rest('v1/interfaces/enable', methods=['POST'])
			0 ignored issues – show Duplication introduced 2021-11-30 20:15 UTC by Report Bug Copy Issue Report This code seems to be duplicated in your project. Loading history...
380			def enable_lldp(self):
381			"""Enable an interface to receive LLDP packets."""
382	1		interface_ids = self._get_data(request)
383	1		error_list = [] # List of interfaces that were not activated.
384	1		changed_interfaces = []
385	1		interface_ids = filter(None, interface_ids)
386	1		interfaces = self._get_interfaces()
387	1		if not interfaces:
388	1		return jsonify("No interfaces were found."), 404
389	1		interfaces = self._get_interfaces_dict(interfaces)
390	1		for id_ in interface_ids:
391	1		interface = interfaces.get(id_)
392	1		if interface:
393	1		interface.lldp = True
394	1		changed_interfaces.append(id_)
395			else:
396	1		error_list.append(id_)
397	1		if changed_interfaces:
398	1		self.notify_lldp_change('enabled', changed_interfaces)
399	1		if not error_list:
400	1		return jsonify(
401			"All the requested interfaces have been enabled."), 200
402
403			# Return a list of interfaces that couldn't be enabled
404	1		msg_error = "Some interfaces couldn't be found and activated: "
405	1		return jsonify({msg_error:
406			error_list}), 400
407
408	1		@rest('v1/polling_time', methods=['GET'])
409			def get_time(self):
410			"""Get LLDP polling time in seconds."""
411	1		return jsonify({"polling_time": self.polling_time}), 200
412
413	1		@rest('v1/polling_time', methods=['POST'])
414			def set_time(self):
415			"""Set LLDP polling time."""
416			# pylint: disable=attribute-defined-outside-init
417	1		try:
418	1		payload = request.get_json()
419	1		polling_time = int(payload['polling_time'])
420	1		if polling_time <= 0:
421			raise ValueError(f"invalid polling_time {polling_time}, "
422			"must be greater than zero")
423	1		self.polling_time = polling_time
424	1		self.execute_as_loop(self.polling_time)
425	1		log.info("Polling time has been updated to %s"
426			" second(s), but this change will not be saved"
427			" permanently.", self.polling_time)
428	1		return jsonify("Polling time has been updated."), 200
429	1		except (ValueError, KeyError) as error:
430	1		msg = f"This operation is not completed: {error}"
431			return jsonify(msg), 400
432

kytos-ng / of_lldp

Pull Request — master (#29)

build.main.Main.notify_lldp_change() A

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