def _popen(cmd): # pragma: no cover
"""Try catched subprocess.popen.
raises explicit error
"""
try:
proc = subprocess.Popen(cmd,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
stdout, stderr = proc.communicate()
return stdout, stderr
except OSError as e:
message = "%s" % e
raise CheckError(message)
def manage_value_from_json(metric_value):
"""
Manage single value expectation in metric from JSON data
:param metric_value: Metric value
:type metric_value: list
:returns: Extracted value from JSON path result
:rtype: string|int
"""
# This context only manage one element
check_result = ContextUtils.check_size(metric_value, 1, 1)
if check_result:
raise CheckError(check_result)
# Get value
return metric_value[0].value
def _find_ip_arp_table(self, system=system):
"""Runs 'bgpctl show'."""
_cmd = "/usr/sbin/arp -na"
_log.debug("running '%s'", _cmd)
result = 0
stdout, stderr = _popen(_cmd.split())
if not isinstance(stderr, str): # pragma: no cover
stderr = stderr.decode()
if not isinstance(stdout, str): # pragma: no cover
stdout = stdout.decode()
if stderr:
message = "%s" % (stderr.splitlines()[-1])
_log.info(message)
raise CheckError(message)
if stdout:
if system == 'OpenBSD':
output = stdout.splitlines()[1:]
else:
output = stdout.splitlines()
if output:
ArpEntry = namedtuple('ArpEntry', platforms[system]['fields'])
for line in output:
data = line.split()[0:4]
entry = ArpEntry(*data)
ip = entry.Host
if system in ('Linux', 'FreeBSD'):
# here we remove () around ip
ip = ip[1:-1]
if ip == self.ip:
if len(entry.Mac.split(':')) == 6:
result = 1
break
return result