build.main.Main.check_storehouse_consistency() - Code Metrics - Inspection of "Merge pull request #96 from josemauro/add-consiste..." - kytos/flow_manager - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 07a00f...bd5303 )

by Humberto

created 2020-12-23 20:21 UTC

build.main.Main.check_storehouse_consistency() A

↳ Parent: build.main

Complexity

Conditions

Size

Total Lines	26
Code Lines	20

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	13
CRAP Score	4.343

Importance

Changes

Metric	Value
cc	4
eloc	20
nop	2
dl	0
loc	26
ccs	13
cts	18
cp	0.7221
crap	4.343
rs	9.4
c	0
b	0
f	0

"""kytos/flow_manager NApp installs, lists and deletes switch flows."""
from collections import OrderedDict

from flask import jsonify, request

from kytos.core import KytosEvent, KytosNApp, log, rest
from kytos.core.helpers import listen_to
from napps.kytos.flow_manager.storehouse import StoreHouse
from napps.kytos.of_core.flow import FlowFactory

from .exceptions import InvalidCommandError
from .settings import CONSISTENCY_INTERVAL, FLOWS_DICT_MAX_SIZE


class Main(KytosNApp):
    """Main class to be used by Kytos controller."""

    def setup(self):
        """Replace the 'init' method for the KytosApp subclass.

        The setup method is automatically called by the run method.
        Users shouldn't call this method directly.
        """
        log.debug("flow-manager starting")
        self._flow_mods_sent = OrderedDict()
        self._flow_mods_sent_max_size = FLOWS_DICT_MAX_SIZE

        # Storehouse client to save and restore flow data:
        self.storehouse = StoreHouse(self.controller)

        # Format of stored flow data:
        # {'flow_persistence': {'dpid_str': {'flow_list': [
        #                                     {'command': '<add|delete>',
        #                                      'flow': {flow_dict}}]}}}
        self.stored_flows = {}
        self.resent_flows = set()
        if CONSISTENCY_INTERVAL > 0:
            self.execute_as_loop(CONSISTENCY_INTERVAL)

    def execute(self):
        """Run once on NApp 'start' or in a loop.

        The execute method is called by the run method of KytosNApp class.
        Users shouldn't call this method directly.
        """
        self._load_flows()

        if CONSISTENCY_INTERVAL > 0:
            self.consistency_check()

    def shutdown(self):
        """Shutdown routine of the NApp."""
        log.debug("flow-manager stopping")

    @listen_to('kytos/of_core.handshake.completed')
    def resend_stored_flows(self, event):
        """Resend stored Flows."""
        switch = event.content['switch']
        dpid = str(switch.dpid)
        # This can be a problem because this code is running a thread
        if dpid in self.resent_flows:
            log.info(f'Flow already resended to Switch {dpid}')
            return
        if dpid in self.stored_flows:
            flow_list = self.stored_flows[dpid]['flow_list']
            for flow in flow_list:
                command = flow['command']
                flows_dict = {"flows": [flow['flow']]}
                self._install_flows(command, flows_dict, [switch])
            self.resent_flows.add(dpid)
            log.info(f'Flows resent to Switch {dpid}')

    def consistency_check(self):
        """Check the consistency of flows in each switch."""
        switches = self.controller.switches.values()

        for switch in switches:
            # Check if a dpid is a key in 'stored_flows' dictionary
            if switch.is_enabled():
                self.check_storehouse_consistency(switch)

                if switch.dpid in self.stored_flows:
                    self.check_switch_consistency(switch)

    def check_switch_consistency(self, switch):
        """Check consistency of installed flows for a specific switch."""
        dpid = switch.dpid

        # Flows stored in storehouse
        stored_flows = self.stored_flows[dpid]['flow_list']

        serializer = FlowFactory.get_class(switch)

        for stored_flow in stored_flows:
            command = stored_flow['command']
            stored_flow_obj = serializer.from_dict(stored_flow['flow'], switch)

            flow = {'flows': [stored_flow['flow']]}

            if stored_flow_obj not in switch.flows:
                if command == 'add':
                    log.info('A consistency problem was detected in '
                             f'switch {dpid}.')
                    self._install_flows(command, flow, [switch])
                    log.info(f'Flow forwarded to switch {dpid} to be '
                             'installed.')
            elif command == 'delete':
                log.info('A consistency problem was detected in '
                         f'switch {dpid}.')
                self._install_flows(command, flow, [switch])
                log.info(f'Flow forwarded to switch {dpid} to be deleted.')

    def check_storehouse_consistency(self, switch):
        """Check consistency of installed flows for a specific switch."""
        dpid = switch.dpid

        for installed_flow in switch.flows:
            if dpid not in self.stored_flows:
                log.info('A consistency problem was detected in '
                         f'switch {dpid}.')
                flow = {'flows': [installed_flow.as_dict()]}
                command = 'delete'
                self._install_flows(command, flow, [switch])
                log.info(f'Flow forwarded to switch {dpid} to be deleted.')
            else:
                serializer = FlowFactory.get_class(switch)
                stored_flows = self.stored_flows[dpid]['flow_list']
                stored_flows_list = [serializer.from_dict(stored_flow['flow'],
                                                          switch)
                                     for stored_flow in stored_flows]

                if installed_flow not in stored_flows_list:
                    log.info('A consistency problem was detected in '
                             f'switch {dpid}.')
                    flow = {'flows': [installed_flow.as_dict()]}
                    command = 'delete'
                    self._install_flows(command, flow, [switch])
                    log.info(f'Flow forwarded to switch {dpid} to be deleted.')

    # pylint: disable=attribute-defined-outside-init
    def _load_flows(self):
        """Load stored flows."""
        try:
            data = self.storehouse.get_data()['flow_persistence']
            if 'id' in data:
                del data['id']
            self.stored_flows = data

        except KeyError as error:
            log.debug(f'There are no flows to load: {error}')
        else:
            log.info('Flows loaded.')

    def _store_changed_flows(self, command, flow, switch):
        """Store changed flows.

        Args:
            command: Flow command to be installed
            flow: Flows to be stored
            switch: Switch target
        """
        stored_flows_box = self.stored_flows.copy()
        # if the flow has a destination dpid it can be stored.
        if not switch:
            log.info('The Flow cannot be stored, the destination switch '
                     f'have not been specified: {switch}')
            return
        installed_flow = {}
        flow_list = []
        installed_flow['command'] = command
        installed_flow['flow'] = flow

        serializer = FlowFactory.get_class(switch)
        installed_flow_obj = serializer.from_dict(flow, switch)

        if switch.id not in stored_flows_box:
            # Switch not stored, add to box.
            flow_list.append(installed_flow)
            stored_flows_box[switch.id] = {'flow_list': flow_list}
        else:
            stored_flows = stored_flows_box[switch.id].get('flow_list', [])
            # Check if flow already stored
            for stored_flow in stored_flows:
                stored_flow_obj = serializer.from_dict(stored_flow['flow'],
                                                       switch)
                if installed_flow_obj == stored_flow_obj:
                    if stored_flow['command'] == installed_flow['command']:
                        log.debug('Data already stored.')
                        return
                    # Flow with inconsistency in "command" fields : Remove the
                    # old instruction. This happens when there is a stored
                    # instruction to install the flow, but the new instruction
                    # is to remove it. In this case, the old instruction is
                    # removed and the new one is stored.
                    stored_flow['command'] = installed_flow.get('command')
                    stored_flows.remove(stored_flow)
                    break

            stored_flows.append(installed_flow)
            stored_flows_box[switch.id]['flow_list'] = stored_flows

        stored_flows_box['id'] = 'flow_persistence'
        self.storehouse.save_flow(stored_flows_box)
        del stored_flows_box['id']
        self.stored_flows = stored_flows_box.copy()

    @rest('v2/flows')
    @rest('v2/flows/<dpid>')
    def list(self, dpid=None):
        """Retrieve all flows from a switch identified by dpid.

        If no dpid is specified, return all flows from all switches.
        """
        if dpid is None:
            switches = self.controller.switches.values()
        else:
            switches = [self.controller.get_switch_by_dpid(dpid)]

        switch_flows = {}

        for switch in switches:
            flows_dict = [flow.as_dict() for flow in switch.flows]
            switch_flows[switch.dpid] = {'flows': flows_dict}

        return jsonify(switch_flows)

    @rest('v2/flows', methods=['POST'])
    @rest('v2/flows/<dpid>', methods=['POST'])
    def add(self, dpid=None):
        """Install new flows in the switch identified by dpid.

        If no dpid is specified, install flows in all switches.
        """
        return self._send_flow_mods_from_request(dpid, "add")

    @rest('v2/delete', methods=['POST'])
    @rest('v2/delete/<dpid>', methods=['POST'])
    @rest('v2/flows', methods=['DELETE'])
    @rest('v2/flows/<dpid>', methods=['DELETE'])
    def delete(self, dpid=None):
        """Delete existing flows in the switch identified by dpid.

        If no dpid is specified, delete flows from all switches.
        """
        return self._send_flow_mods_from_request(dpid, "delete")

    def _get_all_switches_enabled(self):
        """Get a list of all switches enabled."""
        switches = self.controller.switches.values()
        return [switch for switch in switches if switch.is_enabled()]

    def _send_flow_mods_from_request(self, dpid, command, flows_dict=None):
        """Install FlowsMods from request."""
        if flows_dict is None:
            flows_dict = request.get_json()
            if flows_dict is None:
                return jsonify({"response": 'flows dict is none.'}), 404

        if dpid:
            switch = self.controller.get_switch_by_dpid(dpid)
            if not switch:
                return jsonify({"response": 'dpid not found.'}), 404
            elif switch.is_enabled() is False:
                if command == "delete":
                    self._install_flows(command, flows_dict, [switch])
                else:
                    return jsonify({"response": 'switch is disabled.'}), 404
            else:
                self._install_flows(command, flows_dict, [switch])
        else:
            self._install_flows(command, flows_dict,
                                self._get_all_switches_enabled())

        return jsonify({"response": "FlowMod Messages Sent"})

    def _install_flows(self, command, flows_dict, switches=[]):
        """Execute all procedures to install flows in the switches.

        Args:
            command: Flow command to be installed
            flows_dict: Dictionary with flows to be installed in the switches.
            switches: A list of switches
        """
        for switch in switches:
            serializer = FlowFactory.get_class(switch)
            flows = flows_dict.get('flows', [])
            for flow_dict in flows:
                flow = serializer.from_dict(flow_dict, switch)
                if command == "delete":
                    flow_mod = flow.as_of_delete_flow_mod()
                elif command == "add":
                    flow_mod = flow.as_of_add_flow_mod()
                else:
                    raise InvalidCommandError
                self._send_flow_mod(flow.switch, flow_mod)
                self._add_flow_mod_sent(flow_mod.header.xid, flow, command)

                self._send_napp_event(switch, flow, command)
                self._store_changed_flows(command, flow_dict, switch)

    def _add_flow_mod_sent(self, xid, flow, command):
        """Add the flow mod to the list of flow mods sent."""
        if len(self._flow_mods_sent) >= self._flow_mods_sent_max_size:
            self._flow_mods_sent.popitem(last=False)
        self._flow_mods_sent[xid] = (flow, command)

    def _send_flow_mod(self, switch, flow_mod):
        event_name = 'kytos/flow_manager.messages.out.ofpt_flow_mod'

        content = {'destination': switch.connection,
                   'message': flow_mod}

        event = KytosEvent(name=event_name, content=content)
        self.controller.buffers.msg_out.put(event)

    def _send_napp_event(self, switch, flow, command, **kwargs):
        """Send an Event to other apps informing about a FlowMod."""
        if command == 'add':
            name = 'kytos/flow_manager.flow.added'
        elif command == 'delete':
            name = 'kytos/flow_manager.flow.removed'
        elif command == 'error':
            name = 'kytos/flow_manager.flow.error'
        else:
            raise InvalidCommandError
        content = {'datapath': switch,
                   'flow': flow}
        content.update(kwargs)
        event_app = KytosEvent(name, content)
        self.controller.buffers.app.put(event_app)

    @listen_to('.*.of_core.*.ofpt_error')
    def handle_errors(self, event):
        """Receive OpenFlow error and send a event.

        The event is sent only if the error is related to a request made
        by flow_manager.
        """
        xid = event.content["message"].header.xid.value
        error_type = event.content["message"].error_type
        error_code = event.content["message"].code
        try:
            flow, error_command = self._flow_mods_sent[xid]
        except KeyError:
            pass
        else:
            self._send_napp_event(flow.switch, flow, 'error',
                                  error_command=error_command,
                                  error_type=error_type, error_code=error_code)


1		"""kytos/flow_manager NApp installs, lists and deletes switch flows."""
2	1	from collections import OrderedDict
3
4	1	from flask import jsonify, request
5
6	1	from kytos.core import KytosEvent, KytosNApp, log, rest
7	1	from kytos.core.helpers import listen_to
8	1	from napps.kytos.flow_manager.storehouse import StoreHouse
9	1	from napps.kytos.of_core.flow import FlowFactory
10
11	1	from .exceptions import InvalidCommandError
12	1	from .settings import CONSISTENCY_INTERVAL, FLOWS_DICT_MAX_SIZE
13
14
15	1	class Main(KytosNApp):
16		"""Main class to be used by Kytos controller."""
17
18	1	def setup(self):
19		"""Replace the 'init' method for the KytosApp subclass.
20
21		The setup method is automatically called by the run method.
22		Users shouldn't call this method directly.
23		"""
24	1	log.debug("flow-manager starting")
25	1	self._flow_mods_sent = OrderedDict()
26	1	self._flow_mods_sent_max_size = FLOWS_DICT_MAX_SIZE
27
28		# Storehouse client to save and restore flow data:
29	1	self.storehouse = StoreHouse(self.controller)
30
31		# Format of stored flow data:
32		# {'flow_persistence': {'dpid_str': {'flow_list': [
33		# {'command': '<add\|delete>',
34		# 'flow': {flow_dict}}]}}}
35	1	self.stored_flows = {}
36	1	self.resent_flows = set()
37	1	if CONSISTENCY_INTERVAL > 0:
38	1	self.execute_as_loop(CONSISTENCY_INTERVAL)
39
40	1	def execute(self):
41		"""Run once on NApp 'start' or in a loop.
42
43		The execute method is called by the run method of KytosNApp class.
44		Users shouldn't call this method directly.
45		"""
46		self._load_flows()
47
48		if CONSISTENCY_INTERVAL > 0:
49		self.consistency_check()
50
51	1	def shutdown(self):
52		"""Shutdown routine of the NApp."""
53		log.debug("flow-manager stopping")
54
55	1	@listen_to('kytos/of_core.handshake.completed')
56		def resend_stored_flows(self, event):
57		"""Resend stored Flows."""
58	1	switch = event.content['switch']
59	1	dpid = str(switch.dpid)
60		# This can be a problem because this code is running a thread
61	1	if dpid in self.resent_flows:
62		log.info(f'Flow already resended to Switch {dpid}')
63		return
64	1	if dpid in self.stored_flows:
65	1	flow_list = self.stored_flows[dpid]['flow_list']
66	1	for flow in flow_list:
67	1	command = flow['command']
68	1	flows_dict = {"flows": [flow['flow']]}
69	1	self._install_flows(command, flows_dict, [switch])
70	1	self.resent_flows.add(dpid)
71	1	log.info(f'Flows resent to Switch {dpid}')
72
73	1	def consistency_check(self):
74		"""Check the consistency of flows in each switch."""
75		switches = self.controller.switches.values()
76
77		for switch in switches:
78		# Check if a dpid is a key in 'stored_flows' dictionary
79		if switch.is_enabled():
80		self.check_storehouse_consistency(switch)
81
82		if switch.dpid in self.stored_flows:
83		self.check_switch_consistency(switch)
84
85	1	def check_switch_consistency(self, switch):
86		"""Check consistency of installed flows for a specific switch."""
87	1	dpid = switch.dpid
88
89		# Flows stored in storehouse
90	1	stored_flows = self.stored_flows[dpid]['flow_list']
91
92	1	serializer = FlowFactory.get_class(switch)
93
94	1	for stored_flow in stored_flows:
95	1	command = stored_flow['command']
96	1	stored_flow_obj = serializer.from_dict(stored_flow['flow'], switch)
97
98	1	flow = {'flows': [stored_flow['flow']]}
99
100	1	if stored_flow_obj not in switch.flows:
101	1	if command == 'add':
102	1	log.info('A consistency problem was detected in '
103		f'switch {dpid}.')
104	1	self._install_flows(command, flow, [switch])
105	1	log.info(f'Flow forwarded to switch {dpid} to be '
106		'installed.')
107	1	elif command == 'delete':
108	1	log.info('A consistency problem was detected in '
109		f'switch {dpid}.')
110	1	self._install_flows(command, flow, [switch])
111	1	log.info(f'Flow forwarded to switch {dpid} to be deleted.')
112
113	1	def check_storehouse_consistency(self, switch):
114		"""Check consistency of installed flows for a specific switch."""
115	1	dpid = switch.dpid
116
117	1	for installed_flow in switch.flows:
118	1	if dpid not in self.stored_flows:
119		log.info('A consistency problem was detected in '
120		f'switch {dpid}.')
121		flow = {'flows': [installed_flow.as_dict()]}
122		command = 'delete'
123		self._install_flows(command, flow, [switch])
124		log.info(f'Flow forwarded to switch {dpid} to be deleted.')
125		else:
126	1	serializer = FlowFactory.get_class(switch)
127	1	stored_flows = self.stored_flows[dpid]['flow_list']
128	1	stored_flows_list = [serializer.from_dict(stored_flow['flow'],
129		switch)
130		for stored_flow in stored_flows]
131
132	1	if installed_flow not in stored_flows_list:
133	1	log.info('A consistency problem was detected in '
134		f'switch {dpid}.')
135	1	flow = {'flows': [installed_flow.as_dict()]}
136	1	command = 'delete'
137	1	self._install_flows(command, flow, [switch])
138	1	log.info(f'Flow forwarded to switch {dpid} to be deleted.')
139
140		# pylint: disable=attribute-defined-outside-init
141	1	def _load_flows(self):
142		"""Load stored flows."""
143	1	try:
144	1	data = self.storehouse.get_data()['flow_persistence']
145	1	if 'id' in data:
146		del data['id']
147	1	self.stored_flows = data
148
149		except KeyError as error:
150		log.debug(f'There are no flows to load: {error}')
151		else:
152	1	log.info('Flows loaded.')
153
154	1	def _store_changed_flows(self, command, flow, switch):
155		"""Store changed flows.
156
157		Args:
158		command: Flow command to be installed
159		flow: Flows to be stored
160		switch: Switch target
161		"""
162	1	stored_flows_box = self.stored_flows.copy()
163		# if the flow has a destination dpid it can be stored.
164	1	if not switch:
165		log.info('The Flow cannot be stored, the destination switch '
166		f'have not been specified: {switch}')
167		return
168	1	installed_flow = {}
169	1	flow_list = []
170	1	installed_flow['command'] = command
171	1	installed_flow['flow'] = flow
172
173	1	serializer = FlowFactory.get_class(switch)
174	1	installed_flow_obj = serializer.from_dict(flow, switch)
175
176	1	if switch.id not in stored_flows_box:
177		# Switch not stored, add to box.
178	1	flow_list.append(installed_flow)
179	1	stored_flows_box[switch.id] = {'flow_list': flow_list}
180		else:
181	1	stored_flows = stored_flows_box[switch.id].get('flow_list', [])
182		# Check if flow already stored
183	1	for stored_flow in stored_flows:
184	1	stored_flow_obj = serializer.from_dict(stored_flow['flow'],
185		switch)
186	1	if installed_flow_obj == stored_flow_obj:
187	1	if stored_flow['command'] == installed_flow['command']:
188		log.debug('Data already stored.')
189		return
190		# Flow with inconsistency in "command" fields : Remove the
191		# old instruction. This happens when there is a stored
192		# instruction to install the flow, but the new instruction
193		# is to remove it. In this case, the old instruction is
194		# removed and the new one is stored.
195	1	stored_flow['command'] = installed_flow.get('command')
196	1	stored_flows.remove(stored_flow)
197	1	break
198
199	1	stored_flows.append(installed_flow)
200	1	stored_flows_box[switch.id]['flow_list'] = stored_flows
201
202	1	stored_flows_box['id'] = 'flow_persistence'
203	1	self.storehouse.save_flow(stored_flows_box)
204	1	del stored_flows_box['id']
205	1	self.stored_flows = stored_flows_box.copy()
206
207	1	@rest('v2/flows')
208	1	@rest('v2/flows/<dpid>')
209	1	def list(self, dpid=None):
210		"""Retrieve all flows from a switch identified by dpid.
211
212		If no dpid is specified, return all flows from all switches.
213		"""
214	1	if dpid is None:
215	1	switches = self.controller.switches.values()
216		else:
217	1	switches = [self.controller.get_switch_by_dpid(dpid)]
218
219	1	switch_flows = {}
220
221	1	for switch in switches:
222	1	flows_dict = [flow.as_dict() for flow in switch.flows]
223	1	switch_flows[switch.dpid] = {'flows': flows_dict}
224
225	1	return jsonify(switch_flows)
226
227	1	@rest('v2/flows', methods=['POST'])
228	1	@rest('v2/flows/<dpid>', methods=['POST'])
229	1	def add(self, dpid=None):
230		"""Install new flows in the switch identified by dpid.
231
232		If no dpid is specified, install flows in all switches.
233		"""
234	1	return self._send_flow_mods_from_request(dpid, "add")
235
236	1	@rest('v2/delete', methods=['POST'])
237	1	@rest('v2/delete/<dpid>', methods=['POST'])
238	1	@rest('v2/flows', methods=['DELETE'])
239	1	@rest('v2/flows/<dpid>', methods=['DELETE'])
240	1	def delete(self, dpid=None):
241		"""Delete existing flows in the switch identified by dpid.
242
243		If no dpid is specified, delete flows from all switches.
244		"""
245	1	return self._send_flow_mods_from_request(dpid, "delete")
246
247	1	def _get_all_switches_enabled(self):
248		"""Get a list of all switches enabled."""
249	1	switches = self.controller.switches.values()
250	1	return [switch for switch in switches if switch.is_enabled()]
251
252	1	def _send_flow_mods_from_request(self, dpid, command, flows_dict=None):
253		"""Install FlowsMods from request."""
254	1	if flows_dict is None:
255	1	flows_dict = request.get_json()
256	1	if flows_dict is None:
257	1	return jsonify({"response": 'flows dict is none.'}), 404
258
259	1	if dpid:
260	1	switch = self.controller.get_switch_by_dpid(dpid)
261	1	if not switch:
262	1	return jsonify({"response": 'dpid not found.'}), 404
263	1	elif switch.is_enabled() is False:
264	1	if command == "delete":
265	1	self._install_flows(command, flows_dict, [switch])
266		else:
267	1	return jsonify({"response": 'switch is disabled.'}), 404
268		else:
269	1	self._install_flows(command, flows_dict, [switch])
270		else:
271	1	self._install_flows(command, flows_dict,
272		self._get_all_switches_enabled())
273
274	1	return jsonify({"response": "FlowMod Messages Sent"})
275
276	1	def _install_flows(self, command, flows_dict, switches=[]):
277		"""Execute all procedures to install flows in the switches.
278
279		Args:
280		command: Flow command to be installed
281		flows_dict: Dictionary with flows to be installed in the switches.
282		switches: A list of switches
283		"""
284	1	for switch in switches:
285	1	serializer = FlowFactory.get_class(switch)
286	1	flows = flows_dict.get('flows', [])
287	1	for flow_dict in flows:
288	1	flow = serializer.from_dict(flow_dict, switch)
289	1	if command == "delete":
290		flow_mod = flow.as_of_delete_flow_mod()
291	1	elif command == "add":
292	1	flow_mod = flow.as_of_add_flow_mod()
293		else:
294		raise InvalidCommandError
295	1	self._send_flow_mod(flow.switch, flow_mod)
296	1	self._add_flow_mod_sent(flow_mod.header.xid, flow, command)
297
298	1	self._send_napp_event(switch, flow, command)
299	1	self._store_changed_flows(command, flow_dict, switch)
300
301	1	def _add_flow_mod_sent(self, xid, flow, command):
302		"""Add the flow mod to the list of flow mods sent."""
303	1	if len(self._flow_mods_sent) >= self._flow_mods_sent_max_size:
304		self._flow_mods_sent.popitem(last=False)
305	1	self._flow_mods_sent[xid] = (flow, command)
306
307	1	def _send_flow_mod(self, switch, flow_mod):
308	1	event_name = 'kytos/flow_manager.messages.out.ofpt_flow_mod'
309
310	1	content = {'destination': switch.connection,
311		'message': flow_mod}
312
313	1	event = KytosEvent(name=event_name, content=content)
314	1	self.controller.buffers.msg_out.put(event)
315
316	1	def _send_napp_event(self, switch, flow, command, **kwargs):
317		"""Send an Event to other apps informing about a FlowMod."""
318	1	if command == 'add':
319	1	name = 'kytos/flow_manager.flow.added'
320	1	elif command == 'delete':
321	1	name = 'kytos/flow_manager.flow.removed'
322	1	elif command == 'error':
323	1	name = 'kytos/flow_manager.flow.error'
324		else:
325		raise InvalidCommandError
326	1	content = {'datapath': switch,
327		'flow': flow}
328	1	content.update(kwargs)
329	1	event_app = KytosEvent(name, content)
330	1	self.controller.buffers.app.put(event_app)
331
332	1	@listen_to('..of_core..ofpt_error')
333		def handle_errors(self, event):
334		"""Receive OpenFlow error and send a event.
335
336		The event is sent only if the error is related to a request made
337		by flow_manager.
338		"""
339	1	xid = event.content["message"].header.xid.value
340	1	error_type = event.content["message"].error_type
341	1	error_code = event.content["message"].code
342	1	try:
343	1	flow, error_command = self._flow_mods_sent[xid]
344		except KeyError:
345		pass
346		else:
347	1	self._send_napp_event(flow.switch, flow, 'error',
348		error_command=error_command,
349		error_type=error_type, error_code=error_code)
350

kytos / flow_manager

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