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#!/usr/bin/env python
# Copyright 2016 Cisco Systems, Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
from collections import OrderedDict
from log import LOG
class PacketAnalyzer(object):
"""Analyze packet drop counter in a chain"""
def __init__(self):
self.last_packet_count = 0
self.chain = []
def record(self, interface, traffic_type):
"""Records the counter of the next interface with the corresponding traffic type"""
if interface.is_no_op():
return
packet_count = interface.get_packet_count(traffic_type)
packet_drop_count = self.last_packet_count - packet_count
path_data = OrderedDict()
path_data['interface'] = interface.name
path_data['device'] = interface.device
path_data['packet_count'] = packet_count
if self.chain:
path_data['packet_drop_count'] = packet_drop_count
self.chain.append(path_data)
self.last_packet_count = packet_count
def get_analysis(self):
"""Gets the analysis of packet drops"""
transmitted_packets = self.chain[0]['packet_count']
for (index, path_data) in enumerate(self.chain):
LOG.info('[Packet Analyze] Interface: %s' % (path_data['interface']))
LOG.info('[Packet Analyze] > Count: %d' % (path_data['packet_count']))
if index:
if transmitted_packets:
self.chain[index]['packet_drop_percentage'] = \
100.0 * path_data['packet_drop_count'] / transmitted_packets
else:
self.chain[index]['packet_drop_percentage'] = float('nan')
LOG.info('[Packet Analyze] > Packet Drops: %d' %
(path_data['packet_drop_count']))
LOG.info('[Packet Analyze] > Percentage: %s' %
(path_data['packet_drop_percentage']))
return self.chain
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