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#!/usr/bin/env python3
import subprocess
import jinja2
import sys
from vyos.config import Config
PDNS_CMD='/usr/bin/rec_control'
OUT_TMPL_SRC = """
DNS forwarding statistics:
Cache entries: {{ cache_entries -}}
Cache size: {{ cache_size }} kbytes
"""
if __name__ == '__main__':
# Do nothing if service is not configured
c = Config()
if not c.exists_effective('service dns forwarding'):
print("DNS forwarding is not configured")
sys.exit(0)
data = {}
data['cache_entries'] = subprocess.check_output([PDNS_CMD, 'get cache-entries']).decode()
data['cache_size'] = "{0:.2f}".format( int(subprocess.check_output([PDNS_CMD, 'get cache-bytes']).decode()) / 1024 )
tmpl = jinja2.Template(OUT_TMPL_SRC)
print(tmpl.render(data))
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