pvc/client-common/client_lib/network.py

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#!/usr/bin/env python3
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# network.py - PVC client function library, Network fuctions
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018 Joshua M. Boniface <joshua@boniface.me>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
###############################################################################
import os
import socket
import time
import uuid
import re
import tempfile
import subprocess
import difflib
import colorama
import click
import lxml.objectify
import configparser
import kazoo.client
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import client_lib.ansiiprint as ansiiprint
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import client_lib.zkhandler as zkhandler
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import client_lib.common as common
#
# Cluster search functions
#
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def getClusterNetworkList(zk_conn):
# Get a list of VNIs by listing the children of /networks
vni_list = zk_conn.get_children('/networks')
description_list = []
# For each VNI, get the corresponding description from the data
for vni in vni_list:
description_list.append(zk_conn.get('/networks/{}'.format(vni))[0].decode('ascii'))
return vni_list, description_list
def searchClusterByVNI(zk_conn, vni):
try:
# Get the lists
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vni_list, description_list = getClusterNetworkList(zk_conn)
# We're looking for UUID, so find that element ID
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index = vni_list.index(vni)
# Get the name_list element at that index
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description = description_list[index]
except ValueError:
# We didn't find anything
return None
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return description
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def searchClusterByDescription(zk_conn, description):
try:
# Get the lists
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vni_list, description_list = getClusterNetworkList(zk_conn)
# We're looking for name, so find that element ID
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index = description_list.index(description)
# Get the uuid_list element at that index
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vni = vni_list[index]
except ValueError:
# We didn't find anything
return None
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return vni
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def getNetworkVNI(zk_conn, network):
# Validate and obtain alternate passed value
if network.isdigit():
net_description = searchClusterByVNI(zk_conn, network)
net_vni = searchClusterByDescription(zk_conn, net_description)
else:
net_vni = searchClusterByDescription(zk_conn, network)
net_description = searchClusterByVNI(zk_conn, net_vni)
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return net_vni
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def getNetworkDescription(zk_conn, network):
# Validate and obtain alternate passed value
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if network.isdigit():
net_description = searchClusterByVNI(zk_conn, network)
net_vni = searchClusterByDescription(zk_conn, net_description)
else:
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net_vni = searchClusterByDescription(zk_conn, network)
net_description = searchClusterByVNI(zk_conn, net_vni)
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return net_description
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def getNetworkDHCPReservations(zk_conn, vni):
# Get a list of VNIs by listing the children of /networks/<vni>/dhcp_reservations
dhcp_reservations = sorted(zk_conn.get_children('/networks/{}/dhcp_reservations'.format(vni)))
return dhcp_reservations
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def getNetworkFirewallRules(zk_conn, vni):
firewall_rules = zk_conn.get_children('/networks/{}/firewall_rules'.format(vni))
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return None
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def getNetworkInformation(zk_conn, vni):
description = zk_conn.get('/networks/{}'.format(vni))[0].decode('ascii')
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domain = zk_conn.get('/networks/{}/domain'.format(vni))[0].decode('ascii')
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ip_network = zk_conn.get('/networks/{}/ip_network'.format(vni))[0].decode('ascii')
ip_gateway = zk_conn.get('/networks/{}/ip_gateway'.format(vni))[0].decode('ascii')
dhcp_flag = zk_conn.get('/networks/{}/dhcp_flag'.format(vni))[0].decode('ascii')
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return description, domain, ip_network, ip_gateway, dhcp_flag
def getDHCPReservationInformation(zk_conn, vni, reservation):
description = zkhandler.readdata(zk_conn, '/networks/{}/dhcp_reservations/{}'.format(vni, reservation))
ip_address = zkhandler.readdata(zk_conn, '/networks/{}/dhcp_reservations/{}/ipv4addr'.format(vni, reservation))
mac_address = zkhandler.readdata(zk_conn, '/networks/{}/dhcp_reservations/{}/macaddr'.format(vni, reservation))
return description, ip_address, mac_address
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def formatNetworkInformation(zk_conn, vni, long_output):
description, ip_network, ip_gateway, dhcp_flag = getNetworkInformation(zk_conn, vni)
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if dhcp_flag:
dhcp_flag_colour = ansiiprint.green()
else:
dhcp_flag_colour = ansiiprint.blue()
colour_off = ansiiprint.end()
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# Format a nice output: do this line-by-line then concat the elements at the end
ainformation = []
ainformation.append('{}Virtual network information:{}'.format(ansiiprint.bold(), ansiiprint.end()))
ainformation.append('')
# Basic information
ainformation.append('{}VNI:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), vni))
ainformation.append('{}Description:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), description))
ainformation.append('{}IP network:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), ip_network))
ainformation.append('{}IP gateway:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), ip_gateway))
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ainformation.append('{}DHCP enabled:{} {}{}{}'.format(ansiiprint.purple(), ansiiprint.end(), dhcp_flag_colour, dhcp_flag, colour_off))
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if long_output:
dhcp_reservations_list = zk_conn.get_children('/networks/{}/dhcp_reservations'.format(vni))
if dhcp_reservations_list:
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ainformation.append('')
ainformation.append('{}Client DHCP reservations:{}'.format(ansiiprint.bold(), ansiiprint.end()))
ainformation.append('')
dhcp_reservations_string = formatDHCPReservationList(zk_conn, vni, dhcp_reservations_list)
for line in dhcp_reservations_string.split('\n'):
ainformation.append(line)
firewall_rules = zk_conn.get_children('/networks/{}/firewall_rules'.format(vni))
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if firewall_rules:
ainformation.append('')
ainformation.append('{}Network firewall rules:{}'.format(ansiiprint.bold(), ansiiprint.end()))
ainformation.append('')
formatted_firewall_rules = get_list_firewall_rules(zk_conn, vni)
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# Join it all together
information = '\n'.join(ainformation)
return information
def formatNetworkList(zk_conn, net_list):
net_list_output = []
description = {}
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domain = {}
ip_network = {}
ip_gateway = {}
dhcp_flag = {}
dhcp_flag_colour = {}
colour_off = ansiiprint.end()
# Gather information for printing
for net in net_list:
# get info
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description[net], domain[net], ip_network[net], ip_gateway[net], dhcp_flag[net] = getNetworkInformation(zk_conn, net)
if dhcp_flag[net]:
dhcp_flag_colour[net] = ansiiprint.green()
else:
dhcp_flag_colour[net] = ansiiprint.blue()
# Determine optimal column widths
# Dynamic columns: node_name, hypervisor, migrated
net_vni_length = 5
net_description_length = 13
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net_domain_length = 8
net_ip_network_length = 12
net_ip_gateway_length = 9
for net in net_list:
# vni column
_net_vni_length = len(net) + 1
if _net_vni_length > net_vni_length:
net_vni_length = _net_vni_length
# description column
_net_description_length = len(description[net]) + 1
if _net_description_length > net_description_length:
net_description_length = _net_description_length
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# domain column
_net_domain_length = len(domain[net]) + 1
if _net_domain_length > net_domain_length:
net_domain_length = _net_domain_length
# ip_network column
_net_ip_network_length = len(ip_network[net]) + 1
if _net_ip_network_length > net_ip_network_length:
net_ip_network_length = _net_ip_network_length
# ip_gateway column
_net_ip_gateway_length = len(ip_gateway[net]) + 1
if _net_ip_gateway_length > net_ip_gateway_length:
net_ip_gateway_length = _net_ip_gateway_length
# Format the string (header)
net_list_output_header = '{bold}\
{net_vni: <{net_vni_length}} \
{net_description: <{net_description_length}} \
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{net_domain: <{net_domain_length}} \
{net_ip_network: <{net_ip_network_length}} \
{net_ip_gateway: <{net_ip_gateway_length}} \
{net_dhcp_flag: <8}\
{end_bold}'.format(
bold=ansiiprint.bold(),
end_bold=ansiiprint.end(),
net_vni_length=net_vni_length,
net_description_length=net_description_length,
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net_domain_length=net_domain_length,
net_ip_network_length=net_ip_network_length,
net_ip_gateway_length=net_ip_gateway_length,
net_vni='VNI',
net_description='Description',
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net_domain='Domain',
net_ip_network='Network',
net_ip_gateway='Gateway',
net_dhcp_flag='DHCP'
)
for net in net_list:
net_list_output.append(
'{bold}\
{net_vni: <{net_vni_length}} \
{net_description: <{net_description_length}} \
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{net_domain: <{net_domain_length}} \
{net_ip_network: <{net_ip_network_length}} \
{net_ip_gateway: <{net_ip_gateway_length}} \
{dhcp_flag_colour}{net_dhcp_flag: <8}{colour_off}\
{end_bold}'.format(
bold='',
end_bold='',
net_vni_length=net_vni_length,
net_description_length=net_description_length,
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net_domain_length=net_domain_length,
net_ip_network_length=net_ip_network_length,
net_ip_gateway_length=net_ip_gateway_length,
net_vni=net,
net_description=description[net],
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net_domain=domain[net],
net_ip_network=ip_network[net],
net_ip_gateway=ip_gateway[net],
net_dhcp_flag=dhcp_flag[net],
dhcp_flag_colour=dhcp_flag_colour[net],
colour_off=colour_off
)
)
output_string = net_list_output_header + '\n' + '\n'.join(sorted(net_list_output))
return output_string
def formatDHCPReservationList(zk_conn, vni, dhcp_reservations_list):
dhcp_reservation_list_output = []
description = {}
ip_address = {}
mac_address = {}
# Gather information for printing
for dhcp_reservation in dhcp_reservations_list:
# get info
description[dhcp_reservation], ip_address[dhcp_reservation], mac_address[dhcp_reservation] = getDHCPReservationInformation(zk_conn, vni, dhcp_reservation)
# Determine optimal column widths
# Dynamic columns: node_name, hypervisor, migrated
reservation_description_length = 13
reservation_ip_address_length = 13
reservation_mac_address_length = 13
for dhcp_reservation in dhcp_reservations_list:
# description column
_reservation_description_length = len(description[dhcp_reservation]) + 1
if _reservation_description_length > reservation_description_length:
reservation_description_length = _reservation_description_length
# ip_network column
_reservation_ip_address_length = len(ip_address[dhcp_reservation]) + 1
if _reservation_ip_address_length > reservation_ip_address_length:
reservation_ip_address_length = _reservation_ip_address_length
# ip_gateway column
_reservation_mac_address_length = len(mac_address[dhcp_reservation]) + 1
if _reservation_mac_address_length > reservation_mac_address_length:
reservation_mac_address_length = _reservation_mac_address_length
# Format the string (header)
dhcp_reservation_list_output_header = '{bold}\
{reservation_description: <{reservation_description_length}} \
{reservation_ip_address: <{reservation_ip_address_length}} \
{reservation_mac_address: <{reservation_mac_address_length}} \
{end_bold}'.format(
bold=ansiiprint.bold(),
end_bold=ansiiprint.end(),
reservation_description_length=reservation_description_length,
reservation_ip_address_length=reservation_ip_address_length,
reservation_mac_address_length=reservation_mac_address_length,
reservation_description='Description',
reservation_ip_address='IP Address',
reservation_mac_address='MAC Address'
)
for dhcp_reservation in dhcp_reservations_list:
dhcp_reservation_list_output.append('{bold}\
{reservation_description: <{reservation_description_length}} \
{reservation_ip_address: <{reservation_ip_address_length}} \
{reservation_mac_address: <{reservation_mac_address_length}} \
{end_bold}'.format(
bold='',
end_bold='',
reservation_description_length=reservation_description_length,
reservation_ip_address_length=reservation_ip_address_length,
reservation_mac_address_length=reservation_mac_address_length,
reservation_description=description[dhcp_reservation],
reservation_ip_address=ip_address[dhcp_reservation],
reservation_mac_address=mac_address[dhcp_reservation]
)
)
output_string = dhcp_reservation_list_output_header + '\n' + '\n'.join(sorted(dhcp_reservation_list_output))
return output_string
def isValidMAC(macaddr):
allowed = re.compile(r"""
(
^([0-9A-F]{2}[:]){5}([0-9A-F]{2})$
)
""",
re.VERBOSE|re.IGNORECASE)
if allowed.match(macaddr) is None:
return False
else:
return True
def isValidIP(ipaddr):
ip_blocks = str(ipaddr).split(".")
if len(ip_blocks) == 4:
for block in ip_blocks:
# Check if number is digit, if not checked before calling this function
if not block.isdigit():
return False
tmp = int(block)
if 0 > tmp > 255:
return False
return True
return False
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#
# Direct functions
#
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def add_network(zk_conn, vni, description, domain, ip_network, ip_gateway, dhcp_flag):
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if description == '':
description = vni
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# Check if a network with this VNI already exists
if zk_conn.exists('/networks/{}'.format(vni)):
return False, 'ERROR: A network with VNI {} already exists!'.format(vni)
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# Add the new network to Zookeeper
transaction = zk_conn.transaction()
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transaction.create('/networks/{}'.format(vni), description.encode('ascii'))
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transaction.create('/networks/{}/domain'.format(vni), domain.encode('ascii'))
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transaction.create('/networks/{}/ip_network'.format(vni), ip_network.encode('ascii'))
transaction.create('/networks/{}/ip_gateway'.format(vni), ip_gateway.encode('ascii'))
transaction.create('/networks/{}/dhcp_flag'.format(vni), str(dhcp_flag).encode('ascii'))
transaction.create('/networks/{}/dhcp_reservations'.format(vni), ''.encode('ascii'))
transaction.create('/networks/{}/firewall_rules'.format(vni), ''.encode('ascii'))
results = transaction.commit()
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return True, 'Network "{}" added successfully!'.format(description)
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def modify_network(zk_conn, vni, **parameters):
# Add the new network to Zookeeper
transaction = zk_conn.transaction()
if parameters['description'] != None:
transaction.set_data('/networks/{}'.format(vni), parameters['description'].encode('ascii'))
if parameters['ip_network'] != None:
transaction.set_data('/networks/{}/ip_network'.format(vni), parameters['ip_network'].encode('ascii'))
if parameters['ip_gateway'] != None:
transaction.set_data('/networks/{}/ip_gateway'.format(vni), parameters['ip_gateway'].encode('ascii'))
if parameters['dhcp_flag'] != None:
transaction.set_data('/networks/{}/dhcp_flag'.format(vni), str(parameters['dhcp_flag']).encode('ascii'))
results = transaction.commit()
return True, 'Network "{}" modified successfully!'.format(vni)
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def remove_network(zk_conn, network):
# Validate and obtain alternate passed value
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vni = getNetworkVNI(zk_conn, network)
description = getNetworkDescription(zk_conn, network)
if not vni:
return False, 'ERROR: Could not find network "{}" in the cluster!'.format(network)
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# Delete the configuration
try:
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zk_conn.delete('/networks/{}'.format(vni), recursive=True)
except:
pass
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return True, 'Network "{}" removed successfully!'.format(description)
def add_dhcp_reservation(zk_conn, network, ipaddress, macaddress, description):
# Validate and obtain standard passed value
net_vni = getNetworkVNI(zk_conn, network)
if net_vni == None:
return False, 'ERROR: Could not find network "{}" in the cluster!'.format(network)
# Use lowercase MAC format exclusively
macaddress = macaddress.lower()
if not isValidMAC(macaddress):
return False, 'ERROR: MAC address "{}" is not valid! Always use ":" as a separator.'.format(macaddress)
if not isValidIP(ipaddress):
return False, 'ERROR: IP address "{}" is not valid!'.format(macaddress)
if not description:
description = macaddress
if zk_conn.exists('/networks/{}/dhcp_reservations/{}'.format(net_vni, description)):
return False, 'ERROR: A reservation with description {} already exists!'.format(description)
# Add the new network to ZK
try:
zkhandler.writedata(zk_conn, {
'/networks/{}/dhcp_reservations/{}'.format(net_vni, description): description,
'/networks/{}/dhcp_reservations/{}/macaddr'.format(net_vni, description): macaddress,
'/networks/{}/dhcp_reservations/{}/ipv4addr'.format(net_vni, description): ipaddress
})
except Exception as e:
return False, 'ERROR: Failed to write to Zookeeper! Exception: "{}".'.format(e)
return True, 'DHCP reservation "{}" added successfully!'.format(description)
def remove_dhcp_reservation(zk_conn, network, reservation):
# Validate and obtain standard passed value
net_vni = getNetworkVNI(zk_conn, network)
if net_vni == None:
return False, 'ERROR: Could not find network "{}" in the cluster!'.format(network)
match_description = ''
# Check if the reservation matches a description, a mac, or an IP address currently in the database
reservation_list = zk_conn.get_children('/networks/{}/dhcp_reservations'.format(net_vni))
for description in reservation_list:
macaddress = zkhandler.readdata(zk_conn, '/networks/{}/dhcp_reservations/{}/macaddr'.format(net_vni, description))
ipaddress = zkhandler.readdata(zk_conn, '/networks/{}/dhcp_reservations/{}/ipv4addr'.format(net_vni, description))
if reservation == description or reservation == macaddress or reservation == ipaddress:
match_description = description
if not match_description:
return False, 'ERROR: No DHCP reservation exists matching "{}"!'.format(reservation)
# Remove the entry from zookeeper
try:
zk_conn.delete('/networks/{}/dhcp_reservations/{}'.format(net_vni, match_description), recursive=True)
except:
return False, 'ERROR: Failed to write to Zookeeper!'
return True, 'DHCP reservation "{}" removed successfully!'.format(match_description)
def get_info(zk_conn, network, long_output):
# Validate and obtain alternate passed value
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net_vni = getNetworkVNI(zk_conn, network)
if net_vni == None:
return False, 'ERROR: Could not find network "{}" in the cluster!'.format(network)
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information = formatNetworkInformation(zk_conn, net_vni, long_output)
click.echo(information)
click.echo('')
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return True, ''
def get_list(zk_conn, limit):
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net_list = []
full_net_list = zk_conn.get_children('/networks')
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for net in full_net_list:
description = zkhandler.readdata(zk_conn, '/networks/{}'.format(net))
if limit != None:
try:
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# Implcitly assume fuzzy limits
if re.match('\^.*', limit) == None:
limit = '.*' + limit
if re.match('.*\$', limit) == None:
limit = limit + '.*'
if re.match(limit, net) != None:
net_list.append(net)
if re.match(limit, description) != None:
net_list.append(net)
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except Exception as e:
return False, 'Regex Error: {}'.format(e)
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else:
net_list.append(net)
output_string = formatNetworkList(zk_conn, net_list)
click.echo(output_string)
return True, ''
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def get_list_dhcp_reservations(zk_conn, network, limit):
# Validate and obtain alternate passed value
net_vni = getNetworkVNI(zk_conn, network)
if net_vni == None:
return False, 'ERROR: Could not find network "{}" in the cluster!'.format(network)
dhcp_reservations_list = []
full_dhcp_reservations_list = zk_conn.get_children('/networks/{}/dhcp_reservations'.format(net_vni))
for dhcp_reservation in full_dhcp_reservations_list:
if limit != None:
try:
# Implcitly assume fuzzy limits
if re.match('\^.*', limit) == None:
limit = '.*' + limit
if re.match('.*\$', limit) == None:
limit = limit + '.*'
if re.match(limit, net) != None:
dhcp_reservations_list.append(dhcp_reservation)
if re.match(limit, description) != None:
dhcp_reservations_list.append(dhcp_reservation)
except Exception as e:
return False, 'Regex Error: {}'.format(e)
else:
dhcp_reservations_list.append(dhcp_reservation)
output_string = formatDHCPReservationList(zk_conn, net_vni, dhcp_reservations_list)
click.echo(output_string)
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return True, ''
def get_list_firewall_rules(zk_conn, network):
# Validate and obtain alternate passed value
net_vni = getNetworkVNI(zk_conn, network)
if net_vni == None:
return False, 'ERROR: Could not find network "{}" in the cluster!'.format(network)
firewall_rules = getNetworkFirewallRules(zk_conn, net_vni)
return firewall_rules