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