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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (c) 2017 Cisco and/or its affiliates.
#
# 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.
#
import logging
import re
from vicn.core.exception import ResourceNotFound
from vicn.core.task import inline_task, BashTask
from vicn.core.task import ParseRegexTask
from vicn.core.task import inherit_parent
from vicn.resource.icn.forwarder import Forwarder
from vicn.resource.icn.icn_application import ICN_SUITE_NDN
log = logging.getLogger(__name__)
NFD_CONF_FILE = "/etc/ndn/nfd.conf"
CMD_SET_STRATEGY_CACHE = '\n'.join([
'sed -i "s/^.*cs_max_packets .*$/ cs_max_packets {nfd.cache_size}/" ' \
'{conf_file}',
'sed -i "0,/\/ / s/\/localhost\/nfd\/strategy\/.*/' \
'\/localhost\/nfd\/strategy\/{nfd.fw_strategy}/" {conf_file}',
'service nfd restart'])
CMD_RESET_CACHE = '''
sed -i "s/^.*cs_max_packets .*$/ cs_max_packets 65536/" {conf_file}
service nfd restart
'''
CMD_ADD_ROUTE = 'nfdc register {route.prefix} {route.face.nfd_uri}'
# or: nfdc register {route.prefix} {route.face.id}
CMD_REMOVE_ROUTE = 'nfdc unregister {route.prefix} {route.face.nfd_uri}'
# or: nfdc unregister {route.prefix} {route.face.id}
CMD_ADD_FACE = 'nfdc create {face.nfdc_flags} {face.nfd_uri}'
CMD_REMOVE_FACE = 'nfdc destroy {face.id}'
# or: nfdc destroy {face.nfd_uri}
# FIXME redundant with Forwarder.FaceType
layer_2_protocols = ["udp", "udp4", "tcp", "tcp4", "ether"]
NFD_DEFAULT_PORT = 6363
# Regular expressions used for parsing nfdc results
STR_ADD_FACE = ('Face creation succeeded: ControlParameters\(FaceId: '
'(?P<id>.*?), Uri: (?P<face_uri>.*?), \)')
RX_ADD_FACE = re.compile(STR_ADD_FACE)
class NFD(Forwarder):
"""
Resource: NFD
"""
__capabilities__ = set(['ICN_SUITE_NDN'])
__service_name__ = 'nfd'
__package_names__ = ['nfd']
#--------------------------------------------------------------------------
# Resource lifecycle
#--------------------------------------------------------------------------
@inherit_parent
@inline_task
def __get__(self):
# NFD is assumed not to exist
raise ResourceNotFound
@inherit_parent
def __create__(self):
# Modify the configuration file before running the forwarder service
conf = BashTask(self.node, CMD_SET_STRATEGY_CACHE, {'nfd': self})
forwarder = super().__create__()
return conf > forwarder
@inherit_parent
def __delete__(self):
raise NotImplementedError
#--------------------------------------------------------------------------
# Attributes
#--------------------------------------------------------------------------
@inline_task
def _get_routes(self):
return {'routes': list()}
@inline_task
def _add_routes(self, route):
return BashTask(self.node, CMD_ADD_ROUTE, {'route': route})
@inline_task
def _remove_routes(self, route):
return BashTask(self.node, CMD_REMOVE_ROUTE, {'route': route})
@inline_task
def _get_faces(self):
return {'faces': list()}
@inline_task
def _add_faces(self, face):
add_face = BashTask(self.node, CMD_ADD_FACE, {'face': face})
set_face_id = ParseRegexTask(RX_ADD_FACE)
return add_face.compose(set_face_id)
@inline_task
def _remove_faces(self, face):
return BashTask(self.node, CMD_REMOVE_FACE, {'face': face})
#--------------------------------------------------------------------------
# Methods
#--------------------------------------------------------------------------
def __method_reset_cache__(self, conf_file):
return BashTask(self.node, CMD_RESET_CACHE, {'conf_file': conf_file})
#--------------------------------------------------------------------------
# Internal methods
#--------------------------------------------------------------------------
def _get_default_port(self):
return NFD_DEFAULT_PORT
def _def_protocol_suite(self):
return ICN_SUITE_NDN
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