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# -*- coding: utf-8 -*-
# Description: 1-wire temperature monitor netdata python.d module
# Author: Diomidis Spinellis <http://www.spinellis.gr>
# SPDX-License-Identifier: GPL-3.0-or-later
import os
import re
from bases.FrameworkServices.SimpleService import SimpleService
# default module values (can be overridden per job in `config`)
update_every = 5
# Location where 1-Wire devices can be found
W1_DIR = '/sys/bus/w1/devices/'
# Lines matching the following regular expression contain a temperature value
RE_TEMP = re.compile(r' t=(-?\d+)')
ORDER = [
'temp',
]
CHARTS = {
'temp': {
'options': [None, '1-Wire Temperature Sensor', 'Celsius', 'Temperature', 'w1sensor.temp', 'line'],
'lines': []
}
}
# Known and supported family members
# Based on linux/drivers/w1/w1_family.h and w1/slaves/w1_therm.c
THERM_FAMILY = {
'10': 'W1_THERM_DS18S20',
'22': 'W1_THERM_DS1822',
'28': 'W1_THERM_DS18B20',
'3b': 'W1_THERM_DS1825',
'42': 'W1_THERM_DS28EA00',
}
class Service(SimpleService):
"""Provide netdata service for 1-Wire sensors"""
def __init__(self, configuration=None, name=None):
SimpleService.__init__(self, configuration=configuration, name=name)
self.order = ORDER
self.definitions = CHARTS
self.probes = []
def check(self):
"""Auto-detect available 1-Wire sensors, setting line definitions
and probes to be monitored."""
try:
file_names = os.listdir(W1_DIR)
except OSError as err:
self.error(err)
return False
lines = []
for file_name in file_names:
if file_name[2] != '-':
continue
if not file_name[0:2] in THERM_FAMILY:
continue
self.probes.append(file_name)
identifier = file_name[3:]
name = identifier
config_name = self.configuration.get('name_' + identifier)
if config_name:
name = config_name
lines.append(['w1sensor_temp_' + identifier, name, 'absolute',
1, 10])
self.definitions['temp']['lines'] = lines
return len(self.probes) > 0
def get_data(self):
"""Return data read from sensors."""
data = dict()
for file_name in self.probes:
file_path = W1_DIR + file_name + '/w1_slave'
identifier = file_name[3:]
try:
with open(file_path, 'r') as device_file:
for line in device_file:
matched = RE_TEMP.search(line)
if matched:
# Round to one decimal digit to filter-out noise
value = round(int(matched.group(1)) / 1000., 1)
value = int(value * 10)
data['w1sensor_temp_' + identifier] = value
except (OSError, IOError) as err:
self.error(err)
continue
return data or None
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