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"""Main module of amlight/flow_stats Kytos Network Application. |
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This NApp does operations with flows not covered by Kytos itself. |
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""" |
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# pylint: disable=too-many-return-statements,too-many-instance-attributes |
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# pylint: disable=too-many-arguments,too-many-branches,too-many-statements |
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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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# pylint: disable=too-many-public-methods |
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class Main(KytosNApp): |
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"""Main class of amlight/flow_stats NApp. |
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This class is the entry point for this napp. |
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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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So, if you have any setup routine, insert it here. |
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""" |
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log.info('Starting Kytos/Amlight flow manager') |
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self.flows_stats_dict = {} |
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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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def flow_from_id(self, flow_id): |
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"""Flow from given flow_id.""" |
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return self.flows_stats_dict.get(flow_id) |
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def flow_stats_by_dpid_flow_id(self, dpids): |
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""" Auxiliar funcion for v1/flow/stats endpoint implementation. |
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""" |
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flow_stats_by_id = {} |
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flows_stats_dict_copy = self.flows_stats_dict.copy() |
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for flow_id, flow in flows_stats_dict_copy.items(): |
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dpid = flow.switch.dpid |
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if dpid in dpids: |
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if dpid not in flow_stats_by_id: |
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flow_stats_by_id[dpid] = {} |
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flow_stats_by_id[dpid].update({flow_id: flow.stats.as_dict()}) |
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return flow_stats_by_id |
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@rest('v1/flow/stats') |
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def flow_stats(self): |
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"""Return the flows stats by dpid. |
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Return the stats of all flows if dpid is None |
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""" |
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args = request.args |
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dpids = args.getlist("dpid", type=str) |
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if len(dpids) == 0: |
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dpids = [sw.dpid for sw in self.controller.switches.values()] |
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flow_stats_by_id = self.flow_stats_by_dpid_flow_id(dpids) |
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return jsonify(flow_stats_by_id) |
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@rest('v1/packet_count/<flow_id>') |
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def packet_count(self, flow_id): |
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"""Packet count of an specific flow.""" |
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flow = self.flow_from_id(flow_id) |
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if flow is None: |
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return "Flow does not exist", 404 |
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packet_stats = { |
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'flow_id': flow_id, |
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'packet_counter': flow.stats.packet_count, |
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'packet_per_second': |
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flow.stats.packet_count / flow.stats.duration_sec |
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} |
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return jsonify(packet_stats) |
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@rest('v1/bytes_count/<flow_id>') |
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def bytes_count(self, flow_id): |
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"""Bytes count of an specific flow.""" |
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flow = self.flow_from_id(flow_id) |
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if flow is None: |
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return "Flow does not exist", 404 |
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bytes_stats = { |
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'flow_id': flow_id, |
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'bytes_counter': flow.stats.byte_count, |
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'bits_per_second': |
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flow.stats.byte_count * 8 / flow.stats.duration_sec |
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} |
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return jsonify(bytes_stats) |
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@rest('v1/packet_count/per_flow/<dpid>') |
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def packet_count_per_flow(self, dpid): |
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"""Per flow packet count.""" |
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return self.flows_counters('packet_count', |
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dpid, |
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counter='packet_counter', |
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rate='packet_per_second') |
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@rest('v1/bytes_count/per_flow/<dpid>') |
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def bytes_count_per_flow(self, dpid): |
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"""Per flow bytes count.""" |
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return self.flows_counters('byte_count', |
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dpid, |
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counter='bytes_counter', |
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rate='bits_per_second') |
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def flows_counters(self, field, dpid, counter=None, rate=None, |
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total=False): |
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"""Calculate flows statistics. |
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The returned statistics are both per flow and for the sum of flows |
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""" |
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if total: |
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count_flows = 0 |
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else: |
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count_flows = [] |
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if not counter: |
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counter = field |
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if not rate: |
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rate = field |
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# We don't have statistics persistence yet, so for now this only works |
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# for start and end equals to zero |
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flows = self.flow_stats_by_dpid_flow_id([dpid]) |
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flows = flows.get(dpid) |
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if flows is None: |
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return jsonify(count_flows) |
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for flow_id, stats in flows.items(): |
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count = stats[field] |
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if total: |
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count_flows += count |
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else: |
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per_second = count / stats['duration_sec'] |
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if rate.startswith('bits'): |
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per_second *= 8 |
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count_flows.append({'flow_id': flow_id, |
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counter: count, |
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rate: per_second}) |
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return jsonify(count_flows) |
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@listen_to('kytos/of_core.flow_stats.received') |
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def on_stats_received(self, event): |
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"""Capture flow stats messages for OpenFlow 1.3.""" |
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self.handle_stats_received(event) |
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def handle_stats_received(self, event): |
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"""Handle flow stats messages for OpenFlow 1.3.""" |
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if 'replies_flows' in event.content: |
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replies_flows = event.content['replies_flows'] |
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self.handle_stats_reply_received(replies_flows) |
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def handle_stats_reply_received(self, replies_flows): |
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"""Update the set of flows stats""" |
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self.flows_stats_dict.update({flow.id: flow for flow in replies_flows}) |
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kytos-ng /
flow_stats
