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"""Main module of amlight/sdntrace_cp Kytos Network Application. |
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Run tracepaths on OpenFlow in the Control Plane |
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""" |
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from datetime import datetime |
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from flask import jsonify, request |
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from kytos.core import KytosNApp, log, rest |
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from kytos.core.helpers import listen_to |
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from napps.amlight.flow_stats.main import Main as FlowManager |
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from napps.amlight.sdntrace_cp import settings |
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from napps.amlight.sdntrace_cp.automate import Automate |
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from napps.amlight.sdntrace_cp.utils import (convert_entries, find_endpoint, |
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prepare_json) |
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class Main(KytosNApp): |
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"""Main class of amlight/sdntrace_cp NApp. |
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This application gets the list of flows from the switches |
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and uses it to trace paths without using the data plane. |
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""" |
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def setup(self): |
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"""Replace the '__init__' method for the KytosNApp subclass. |
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The setup method is automatically called by the controller when your |
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application is loaded. |
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""" |
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log.info("Starting Kytos SDNTrace CP App!") |
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self.traces = {} |
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self.last_id = 30000 |
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self.automate = Automate(self) |
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self.automate.schedule_traces() |
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self.automate.schedule_important_traces() |
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def execute(self): |
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"""This method is executed right after the setup method execution. |
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You can also use this method in loop mode if you add to the above setup |
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method a line like the following example: |
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self.execute_as_loop(30) # 30-second interval. |
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""" |
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def shutdown(self): |
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"""This method is executed when your napp is unloaded. |
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If you have some cleanup procedure, insert it here. |
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""" |
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self.automate.unschedule_ids() |
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self.automate.sheduler_shutdown(wait=False) |
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@rest('/trace', methods=['PUT']) |
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def trace(self): |
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"""Trace a path.""" |
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entries = request.get_json() |
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result = self.tracepath(entries) |
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return jsonify(prepare_json(result)) |
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def tracepath(self, entries): |
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"""Trace a path for a packet represented by entries.""" |
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self.last_id += 1 |
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trace_id = self.last_id |
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entries = convert_entries(entries) |
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trace_result = [] |
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trace_type = 'starting' |
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do_trace = True |
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while do_trace: |
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trace_step = {'in': {'dpid': entries['dpid'], |
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'port': entries['in_port'], |
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'time': str(datetime.now()), |
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'type': trace_type}} |
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if 'vlan_vid' in entries: |
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trace_step['in'].update({'vlan': entries['vlan_vid'][-1]}) |
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switch = self.controller.get_switch_by_dpid(entries['dpid']) |
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result = self.trace_step(switch, entries) |
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if result: |
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out = {'port': result['out_port']} |
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if 'vlan_vid' in result['entries']: |
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out.update({'vlan': result['entries']['vlan_vid'][-1]}) |
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trace_step.update({ |
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'out': out |
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}) |
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if 'dpid' in result: |
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next_step = {'dpid': result['dpid'], |
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'port': result['in_port']} |
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if self.has_loop(next_step, trace_result): |
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do_trace = False |
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else: |
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entries = result['entries'] |
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entries['dpid'] = result['dpid'] |
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entries['in_port'] = result['in_port'] |
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trace_type = 'trace' |
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else: |
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do_trace = False |
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else: |
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do_trace = False |
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trace_result.append(trace_step) |
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self.traces.update({ |
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trace_id: trace_result |
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}) |
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return trace_result |
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@staticmethod |
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def has_loop(trace_step, trace_result): |
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"""Check if there is a loop in the trace result.""" |
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for trace in trace_result: |
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if trace['in']['dpid'] == trace_step['dpid'] and \ |
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trace['in']['port'] == trace_step['port']: |
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return True |
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return False |
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@staticmethod |
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def trace_step(switch, entries): |
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"""Perform a trace step. |
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Match the given fields against the switch's list of flows.""" |
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flow, entries, port = FlowManager.match_and_apply(switch, entries) |
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if not flow or not port: |
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return None |
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endpoint = find_endpoint(switch, port) |
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if endpoint is None: |
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return {'out_port': port, |
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'entries': entries} |
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return {'dpid': endpoint.switch.dpid, |
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'in_port': endpoint.port_number, |
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'out_port': port, |
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'entries': entries} |
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@listen_to('amlight/flow_stats.flows_updated') |
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def update_circuits(self, event): |
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"""Update the list of circuits after a flow change.""" |
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# pylint: disable=unused-argument |
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if settings.FIND_CIRCUITS_IN_FLOWS: |
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self.automate.find_circuits() |
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kytos-ng /
sdntrace_cp
