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# 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/>.
#
from vyos import ConfigError
from vyos.config import Config
from vyos.vpp.utils import cli_ifaces_list
from vyos.vpp import VPPControl
def get_config(config=None) -> dict:
if config:
conf = config
else:
conf = Config()
base = ['vpp', 'sflow']
# Get config_dict with default values
config = conf.get_config_dict(
base,
key_mangling=('-', '_'),
get_first_key=True,
no_tag_node_value_mangle=True,
with_defaults=True,
with_recursive_defaults=True,
)
# Get effective config as we need full dictionary for deletion
effective_config = conf.get_config_dict(
base,
key_mangling=('-', '_'),
effective=True,
get_first_key=True,
no_tag_node_value_mangle=True,
)
# Get system sflow configuration to check for server
system_sflow = conf.get_config_dict(
['system', 'sflow'],
key_mangling=('-', '_'),
get_first_key=True,
no_tag_node_value_mangle=True,
)
if system_sflow:
config['system_sflow'] = system_sflow
if not config:
config['remove'] = True
return config
# Add list of VPP interfaces to the config
config.update({'vpp_ifaces': cli_ifaces_list(conf)})
if effective_config:
config.update({'effective': effective_config})
return config
def verify(config):
if 'remove' in config:
return None
# Check if interface section exists
if 'interface' not in config:
return None
# Verify that all interfaces specified exist in VPP
for interface in config['interface']:
if interface not in config['vpp_ifaces']:
raise ConfigError(
f'{interface} must be a VPP interface for sFlow monitoring'
)
# Verify sample rate is a positive integer
if 'sample_rate' in config:
try:
sample_rate = int(config['sample_rate'])
if sample_rate <= 0:
raise ConfigError('sFlow sample rate must be a positive integer')
except ValueError:
raise ConfigError('sFlow sample rate must be a valid integer')
# Verify that system sflow has enable-vpp defined
if 'system_sflow' not in config or 'vpp' not in config.get('system_sflow', {}):
raise ConfigError(
'sFlow enable-vpp must be defined under system sflow configuration'
)
def generate(config):
# No templates to render for sFlow
pass
def apply(config):
# Initialize VPP control API
vpp = VPPControl(attempts=20, interval=500)
if 'remove' in config:
# Disable sFlow on all interfaces
for interface in config.get('effective', {}).get('interface', []):
vpp.cli_cmd(f'sflow enable-disable {interface} disable')
return None
# Configure sample rate if specified
if 'sample_rate' in config:
vpp.cli_cmd(f'sflow sampling-rate {config["sample_rate"]}')
# Configure interfaces
if 'interface' in config:
# Enable sFlow on specified interfaces
for interface in config['interface']:
vpp.cli_cmd(f'sflow enable-disable {interface}')
# Disable sFlow on interfaces that were removed from config
effective_interfaces = config.get('effective', {}).get('interface', [])
if effective_interfaces:
for interface in effective_interfaces:
if interface not in config['interface']:
vpp.cli_cmd(f'sflow enable-disable {interface} disable')
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
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