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"""kytos/flow_manager NApp installs, lists and deletes switch flows.""" |
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from collections import OrderedDict |
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from flask import jsonify, request |
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from kytos.core import KytosEvent, KytosNApp, log, rest |
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from kytos.core.helpers import listen_to |
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from napps.kytos.flow_manager.storehouse import StoreHouse |
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from napps.kytos.of_core.flow import FlowFactory |
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from .exceptions import InvalidCommandError |
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from .settings import FLOWS_DICT_MAX_SIZE |
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class Main(KytosNApp): |
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"""Main class to be used by Kytos controller.""" |
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def setup(self): |
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"""Replace the 'init' method for the KytosApp subclass. |
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The setup method is automatically called by the run method. |
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Users shouldn't call this method directly. |
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""" |
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log.debug("flow-manager starting") |
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self._flow_mods_sent = OrderedDict() |
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self._flow_mods_sent_max_size = FLOWS_DICT_MAX_SIZE |
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# Storehouse client to save and restore flow data: |
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self.storehouse = StoreHouse(self.controller) |
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# Format of stored flow data: |
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# {'flow_persistence': {'dpid_str': {'flow_list': [ |
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# {'command': '<add|delete>', |
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# 'flow': {flow_dict}}]}}} |
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self.stored_flows = {} |
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self.resent_flows = set() |
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def execute(self): |
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"""Run once on NApp 'start' or in a loop. |
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The execute method is called by the run method of KytosNApp class. |
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Users shouldn't call this method directly. |
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""" |
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self._load_flows() |
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def shutdown(self): |
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"""Shutdown routine of the NApp.""" |
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log.debug("flow-manager stopping") |
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@listen_to('kytos/topology.port.created') |
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def resend_stored_flows(self, event): |
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"""Resend stored Flows.""" |
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dpid = str(event.content['switch']) |
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switch = self.controller.get_switch_by_dpid(dpid) |
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# This can be a problem because this code is running a thread |
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if dpid in self.resent_flows: |
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log.info(f'Flow already resended to Switch {dpid}') |
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return |
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if dpid in self.stored_flows: |
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flow_list = self.stored_flows[dpid]['flow_list'] |
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for flow in flow_list: |
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command = flow['command'] |
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flows_dict = {"flows": [flow['flow']]} |
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self._install_flows(command, flows_dict, [switch]) |
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self.resent_flows.add(dpid) |
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log.info(f'Flows resent to Switch {dpid}') |
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# pylint: disable=attribute-defined-outside-init |
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def _load_flows(self): |
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"""Load stored flows.""" |
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try: |
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data = self.storehouse.get_data()['flow_persistence'] |
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if 'id' in data: |
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del data['id'] |
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self.stored_flows = data |
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except KeyError as error: |
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log.debug(f'There are no flows to load: {error}') |
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else: |
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log.info('Flows loaded.') |
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def _store_changed_flows(self, command, flow, switch): |
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"""Store changed flows. |
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Args: |
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command: Flow command to be installed |
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flow: Flows to be stored |
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switch: Switch target |
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""" |
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stored_flows_box = self.stored_flows.copy() |
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# if the flow has a destination dpid it can be stored. |
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if not switch: |
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log.info('The Flow cannot be stored, the destination switch ' |
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f'have not been specified: {switch}') |
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return |
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installed_flow = {} |
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flow_list = [] |
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installed_flow['command'] = command |
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installed_flow['flow'] = flow |
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serializer = FlowFactory.get_class(switch) |
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installed_flow_obj = serializer.from_dict(flow, switch) |
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if switch.id not in stored_flows_box: |
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# Switch not stored, add to box. |
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flow_list.append(installed_flow) |
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stored_flows_box[switch.id] = {"flow_list": flow_list} |
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else: |
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stored_flows = stored_flows_box[switch.id].get('flow_list', []) |
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# Check if flow already stored |
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for stored_flow in stored_flows: |
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stored_flow_obj = serializer.from_dict(stored_flow['flow'], |
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switch) |
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if installed_flow_obj == stored_flow_obj: |
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if stored_flow['command'] == installed_flow['command']: |
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log.debug('Data already stored.') |
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return |
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# Flow with inconsistency in "command" fields : Remove the |
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# old instruction. This happens when there is a stored |
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# instruction to install the flow, but the new instruction |
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# is to remove it. In this case, the old instruction is |
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# removed and the new one is stored. |
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stored_flow['command'] = installed_flow.get('command') |
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stored_flows.remove(stored_flow) |
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break |
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stored_flows.append(installed_flow) |
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stored_flows_box[switch.id]['flow_list'] = stored_flows |
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stored_flows_box['id'] = 'flow_persistence' |
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self.storehouse.save_flow(stored_flows_box) |
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del stored_flows_box['id'] |
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self.stored_flows = stored_flows_box.copy() |
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@rest('v2/flows') |
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@rest('v2/flows/<dpid>') |
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def list(self, dpid=None): |
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"""Retrieve all flows from a switch identified by dpid. |
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If no dpid is specified, return all flows from all switches. |
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""" |
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if dpid is None: |
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switches = self.controller.switches.values() |
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else: |
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switches = [self.controller.get_switch_by_dpid(dpid)] |
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switch_flows = {} |
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for switch in switches: |
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flows_dict = [flow.as_dict() for flow in switch.flows] |
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switch_flows[switch.dpid] = {'flows': flows_dict} |
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return jsonify(switch_flows) |
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@rest('v2/flows', methods=['POST']) |
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@rest('v2/flows/<dpid>', methods=['POST']) |
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def add(self, dpid=None): |
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"""Install new flows in the switch identified by dpid. |
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If no dpid is specified, install flows in all switches. |
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""" |
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return self._send_flow_mods_from_request(dpid, "add") |
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@rest('v2/delete', methods=['POST']) |
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@rest('v2/delete/<dpid>', methods=['POST']) |
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@rest('v2/flows', methods=['DELETE']) |
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@rest('v2/flows/<dpid>', methods=['DELETE']) |
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def delete(self, dpid=None): |
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"""Delete existing flows in the switch identified by dpid. |
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If no dpid is specified, delete flows from all switches. |
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""" |
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return self._send_flow_mods_from_request(dpid, "delete") |
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def _get_all_switches_enabled(self): |
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"""Get a list of all switches enabled.""" |
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switches = self.controller.switches.values() |
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return [switch for switch in switches if switch.is_enabled()] |
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def _send_flow_mods_from_request(self, dpid, command, flows_dict=None): |
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"""Install FlowsMods from request.""" |
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if flows_dict is None: |
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flows_dict = request.get_json() |
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if flows_dict is None: |
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return jsonify({"response": 'flows dict is none.'}), 404 |
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if dpid: |
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switch = self.controller.get_switch_by_dpid(dpid) |
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if not switch: |
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return jsonify({"response": 'dpid not found.'}), 404 |
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elif switch.is_enabled() is False: |
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return jsonify({"response": 'switch is disabled.'}), 404 |
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else: |
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self._install_flows(command, flows_dict, [switch]) |
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else: |
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self._install_flows(command, flows_dict, |
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self._get_all_switches_enabled()) |
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200
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return jsonify({"response": "FlowMod Messages Sent"}) |
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def _install_flows(self, command, flows_dict, switches=[]): |
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"""Execute all procedures to install flows in the switches. |
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Args: |
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command: Flow command to be installed |
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flows_dict: Dictionary with flows to be installed in the switches. |
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switches: A list of switches |
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""" |
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for switch in switches: |
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serializer = FlowFactory.get_class(switch) |
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flows = flows_dict.get('flows', []) |
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for flow_dict in flows: |
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flow = serializer.from_dict(flow_dict, switch) |
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if command == "delete": |
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flow_mod = flow.as_of_delete_flow_mod() |
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elif command == "add": |
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flow_mod = flow.as_of_add_flow_mod() |
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else: |
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raise InvalidCommandError |
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self._send_flow_mod(flow.switch, flow_mod) |
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self._add_flow_mod_sent(flow_mod.header.xid, flow, command) |
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self._send_napp_event(switch, flow, command) |
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self._store_changed_flows(command, flow_dict, switch) |
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def _add_flow_mod_sent(self, xid, flow, command): |
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"""Add the flow mod to the list of flow mods sent.""" |
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if len(self._flow_mods_sent) >= self._flow_mods_sent_max_size: |
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self._flow_mods_sent.popitem(last=False) |
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self._flow_mods_sent[xid] = (flow, command) |
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def _send_flow_mod(self, switch, flow_mod): |
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event_name = 'kytos/flow_manager.messages.out.ofpt_flow_mod' |
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content = {'destination': switch.connection, |
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'message': flow_mod} |
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event = KytosEvent(name=event_name, content=content) |
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self.controller.buffers.msg_out.put(event) |
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def _send_napp_event(self, switch, flow, command, **kwargs): |
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"""Send an Event to other apps informing about a FlowMod.""" |
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if command == 'add': |
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name = 'kytos/flow_manager.flow.added' |
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elif command == 'delete': |
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name = 'kytos/flow_manager.flow.removed' |
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elif command == 'error': |
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name = 'kytos/flow_manager.flow.error' |
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250
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else: |
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raise InvalidCommandError |
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252
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content = {'datapath': switch, |
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253
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'flow': flow} |
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254
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content.update(kwargs) |
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255
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event_app = KytosEvent(name, content) |
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256
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self.controller.buffers.app.put(event_app) |
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257
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258
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@listen_to('.*.of_core.*.ofpt_error') |
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def handle_errors(self, event): |
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260
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"""Receive OpenFlow error and send a event. |
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261
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262
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The event is sent only if the error is related to a request made |
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263
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by flow_manager. |
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264
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""" |
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265
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xid = event.content["message"].header.xid.value |
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266
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error_type = event.content["message"].error_type |
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267
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error_code = event.content["message"].code |
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268
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try: |
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flow, error_command = self._flow_mods_sent[xid] |
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270
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except KeyError: |
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271
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pass |
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272
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else: |
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273
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self._send_napp_event(flow.switch, flow, 'error', |
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274
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error_command=error_command, |
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275
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error_type=error_type, error_code=error_code) |
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kytos /
flow_manager
