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#!/usr/bin/env python3
#
# Copyright VyOS maintainers and contributors <maintainers@vyos.io>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# 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 <http://www.gnu.org/licenses/>.
import os
from sys import exit
from vyos.config import Config
from vyos.configdep import set_dependents, call_dependents
from vyos.configverify import verify_vrf
from vyos.template import render
from vyos.utils.process import call
from vyos.utils.network import is_addr_assigned
from vyos import ConfigError
from vyos import airbag
airbag.enable()
hsflowd_conf_path = '/run/sflow/hsflowd.conf'
systemd_service = 'hsflowd.service'
systemd_override = f'/run/systemd/system/{systemd_service}.d/override.conf'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['system', 'sflow']
vpp_sflow = conf.exists(['vpp', 'sflow'])
if not conf.exists(base):
return {
'remove': True,
'vpp_sflow': vpp_sflow,
}
sflow = conf.get_config_dict(
base, key_mangling=('-', '_'), get_first_key=True, with_recursive_defaults=True
)
sflow.update({'vpp_sflow': vpp_sflow})
if vpp_sflow:
set_dependents('vpp_sflow', conf)
return sflow
def verify(sflow):
# Check if "vpp" flag could be deleted from configuration
if sflow.get('vpp_sflow'):
if 'vpp' not in sflow or 'remove' in sflow:
raise ConfigError(
'sFlow is still configured in VPP. '
'Please remove sFlow configuration from VPP before proceeding.'
)
if 'remove' in sflow:
return None
# Check if configured sflow agent-address exist in the system
if 'agent_address' in sflow:
tmp = sflow['agent_address']
if not is_addr_assigned(tmp, include_vrf=True):
raise ConfigError(
f'Configured "sflow agent-address {tmp}" does not exist in the system!'
)
# Check if at least one interface is configured
# Skip this check if VPP is enabled
if 'interface' not in sflow and 'vpp' not in sflow:
raise ConfigError('sFlow requires at least one interface to be configured!')
# Check if at least one server is configured
if 'server' not in sflow:
raise ConfigError('You need to configure at least one sFlow server!')
verify_vrf(sflow)
return None
def generate(sflow):
if 'remove' in sflow:
return None
render(hsflowd_conf_path, 'sflow/hsflowd.conf.j2', sflow)
render(systemd_override, 'sflow/override.conf.j2', sflow)
# Reload systemd manager configuration
call('systemctl daemon-reload')
def apply(sflow):
if 'remove' in sflow:
# Stop flow-accounting daemon and remove configuration file
call(f'systemctl stop {systemd_service}')
if os.path.exists(hsflowd_conf_path):
os.unlink(hsflowd_conf_path)
return
# Start/reload flow-accounting daemon
call(f'systemctl restart {systemd_service}')
call_dependents()
if __name__ == '__main__':
try:
config = get_config()
verify(config)
generate(config)
apply(config)
except ConfigError as e:
print(e)
exit(1)
|
