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#!@python@/bin/python
import json
from os import environ
import sys
from http.server import BaseHTTPRequestHandler, HTTPServer
from urllib.parse import urlparse
from textwrap import dedent
import subprocess
def _format_prom_attrs(**attrs):
if not attrs:
return ''
return '{' + ','.join(map(lambda k: f'{k}="{attrs[k]}"', attrs)) + '}'
def _format_prom_metrics(metricName, metricType, metrics, metricHelp=''):
metricStr = dedent(f'''
# HELP {metricName} {metricHelp}
# TYPE {metricName} {metricType}
''').lstrip()
for (attrs, val) in metrics:
attrs_str = _format_prom_attrs(**attrs)
metricStr += dedent(f'''
{metricName}{attrs_str} {val}
''').lstrip()
return metricStr
class NFTMetrics:
_instance = None
@classmethod
def instance(cls):
if cls._instance is None:
cls._instance = cls.__new__(cls)
cls._instance.attrs = None
return cls._instance
def __init__(self):
raise RuntimeError('Call instance() instead')
def update(self):
attrs = dict()
queries = dict()
for query_name in ['ruleset', 'counters', 'maps', 'meters', 'sets']:
process = subprocess.run(
('nft', '--json', 'list', query_name),
stdout = subprocess.PIPE, check = True, text = True
)
data = json.loads(process.stdout)
version = data['nftables'][0]['metainfo']['json_schema_version']
if version != 1:
raise RuntimeError(f'nftables json schema v{version} is not supported')
queries[query_name] = data['nftables'][1:]
def extract_query(query_name, type_name):
return [
item[type_name]
for item in queries[query_name]
if type_name in item
]
attrs['rules_count'] = len(extract_query('ruleset', 'rule'))
attrs['chain_count'] = len(extract_query('ruleset', 'chain'))
attrs['counters'] = extract_query('counters', 'counter')
attrs['maps'] = extract_query('maps', 'map')
attrs['meters'] = extract_query('meters', 'meter')
attrs['sets'] = extract_query('sets', 'set')
self.attrs = attrs
def json_text(self):
return json.dumps(self.attrs)
def prometheus(self):
metrics = ''
metrics += _format_prom_metrics('nftables_rules_count', 'gauge', [({}, self.attrs['rules_count'])], 'Number of nftables rules')
metrics += _format_prom_metrics('nftables_chains_count', 'gauge', [({}, self.attrs['chain_count'])], 'Number of nftables chains')
counter_bytes = []
counter_packets = []
for counter in self.attrs['counters']:
labels = { k: v for k, v in counter.items() if k not in set(['bytes', 'packets']) }
counter_bytes += [(labels, counter['bytes'])]
counter_packets += [(labels, counter['packets'])]
metrics += _format_prom_metrics('nftables_counter_bytes', 'counter', counter_bytes)
metrics += _format_prom_metrics('nftables_counter_packets_count', 'counter', counter_packets)
map_counts = []
for meter in self.attrs['maps']:
labels = { k: v for k, v in counter.items() if k not in set(['elem']) }
map_counts += [(labels, len(meter['elem']))]
metrics += _format_prom_metrics('nftables_map_elem_count', 'gauge', map_counts)
meter_counts = []
for meter in self.attrs['meters']:
labels = { k: v for k, v in counter.items() if k not in set(['elem']) }
meter_counts += [(labels, len(meter['elem']))]
metrics += _format_prom_metrics('nftables_meter_elem_count', 'gauge', meter_counts)
set_counts = []
for meter in self.attrs['sets']:
labels = { k: v for k, v in counter.items() if k not in set(['elem']) }
set_counts += [(labels, len(meter['elem']))]
metrics += _format_prom_metrics('nftables_set_elem_count', 'gauge', set_counts)
return metrics.encode('utf-8')
class NFTMetricsServer(BaseHTTPRequestHandler):
def do_GET(self):
nft_metrics = NFTMetrics.instance()
nft_metrics.update()
url = urlparse(self.path)
match url.path:
case '/metrics.json':
self.send_response(200)
self.send_header("Content-type", "application/json")
self.end_headers()
self.wfile.write(nft_metrics.json_text().encode('utf-8'))
case '/metrics':
self.send_response(200)
self.send_header("Content-type", "text/plain")
self.end_headers()
self.wfile.write(nft_metrics.prometheus())
case _:
self.send_response(404)
self.end_headers()
def main():
webServer = HTTPServer((str(environ.get('NFT_HOSTNAME')), int(environ.get('NFT_PORT'))), NFTMetricsServer)
webServer.serve_forever()
if __name__ == "__main__":
sys.exit(main())
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