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chrony.py
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chrony.py
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"""
blackbird chrony module
get information of time synchronization by using 'chronyc'
"""
__VERSION__ = '0.1.0'
import subprocess
from blackbird.plugins import base
class ConcreteJob(base.JobBase):
"""
This class is Called by "Executor".
Get chrony information and send to backend.
"""
def __init__(self, options, queue=None, logger=None):
super(ConcreteJob, self).__init__(options, queue, logger)
def build_items(self):
"""
main loop
"""
# ping item
self.ping()
# chronyc tracking
self.chrony_tracking()
def _enqueue(self, key, value):
"""
set queue item
"""
item = ChronyItem(
key=key,
value=value,
host=self.options['hostname']
)
self.queue.put(item, block=False)
self.logger.debug(
'Inserted to queue {key}:{value}'
''.format(key=key, value=value)
)
def ping(self):
"""
send ping item
"""
self._enqueue('blackbird.chrony.ping', 1)
self._enqueue('blackbird.chrony.version', __VERSION__)
# pylint: disable=too-many-locals
def chrony_tracking(self):
"""
execute chronyc tracking
"""
_cmd = [
self.options['path'],
'-h', self.options['host'],
'-m', 'retries {rt}'.format(rt=self.options['retry']),
'timeout {to}'.format(to=self.options['timeout']),
'tracking'
]
try:
output, _ = subprocess.Popen(
_cmd,
stderr=subprocess.PIPE,
stdout=subprocess.PIPE
).communicate()
except OSError:
self._enqueue('chrony.synchronized', 0)
raise base.BlackbirdPluginError(
'can not exec "{cmd}", failed to get chrony information'
''.format(cmd=' '.join(_cmd))
)
if 'Cannot talk to daemon' in output:
self._enqueue('chrony.synchronized', 0)
raise base.BlackbirdPluginError(
'chronyc error [{err}]'.format(err=output.strip())
)
_chny_output = dict()
for line in output.rstrip().splitlines():
_key, _value = line.split(' : ')
_chny_output[_key.rstrip()] = _value
# Reference ID
_refid = _chny_output['Reference ID'].split()[0]
self._enqueue('chrony.reference_id', _refid)
# Stratum
self._enqueue('chrony.stratum', _chny_output['Stratum'])
# Ref time (UTC)
self._enqueue('chrony.reference_time', _chny_output['Ref time (UTC)'])
# System time
_stime, _desc = _chny_output['System time'].split(' ', 1)
if 'slow' in _desc:
_stime = float(_stime) * -1
self._enqueue('chrony.system_time', _stime)
# Last offset
_loffset = _chny_output['Last offset'].split()[0]
self._enqueue('chrony.last_offset', _loffset)
# RMS offset
_roffset = _chny_output['RMS offset'].split()[0]
self._enqueue('chrony.rms_offset', _roffset)
# Frequency
_freq, _desc = _chny_output['Frequency'].split(' ', 1)
if 'slow' in _desc:
_freq = float(_freq) * -1
self._enqueue('chrony.frequency', _freq)
# Residual freq
_residual = _chny_output['Residual freq'].split()[0]
self._enqueue('chrony.residual_frequency', _residual)
# Skew
_skew = _chny_output['Skew'].split()[0]
self._enqueue('chrony.skew', _skew)
# Root delay
_rdelay = _chny_output['Root delay'].split()[0]
self._enqueue('chrony.root_delay', _rdelay)
# Root dispersion
_rdisp = _chny_output['Root dispersion'].split()[0]
self._enqueue('chrony.root_dispersion', _rdisp)
# Update interval
_upd_int = _chny_output['Update interval'].split()[0]
self._enqueue('chrony.update_interval', _upd_int)
# Leap status
_leap = _chny_output['Leap status']
self._enqueue('chrony.leap_status', _chny_output['Leap status'])
if _leap == 'Not synchronised':
self._enqueue('chrony.synchronized', 0)
else:
self._enqueue('chrony.synchronized', 1)
# pylint: disable=too-few-public-methods
class ChronyItem(base.ItemBase):
"""
Enqued item.
"""
def __init__(self, key, value, host):
super(ChronyItem, self).__init__(key, value, host)
self._data = {}
self._generate()
@property
def data(self):
return self._data
def _generate(self):
self._data['key'] = self.key
self._data['value'] = self.value
self._data['host'] = self.host
self._data['clock'] = self.clock
class Validator(base.ValidatorBase):
"""
Validate configuration.
"""
def __init__(self):
self.__spec = None
@property
def spec(self):
self.__spec = (
"[{0}]".format(__name__),
"path=string(default='/usr/bin/chronyc')",
"host=string(default='127.0.0.1')",
"timeout=integer(100, 10000, default=1000)",
"retry=integer(1, 100, default=1)",
"hostname=string(default={0})".format(self.detect_hostname()),
)
return self.__spec