Browse code
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Gandolf authored on 06/21/2021 21:24:25
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+#!/usr/bin/python -u |
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+## The -u option above turns off block buffering of python output. This assures |
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+## that each error message gets individually printed to the log file. |
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+# |
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+# Module: createArednsigRrd.py |
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+# |
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+# Description: Creates a rrdtool database for use by the weather agent to |
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+# store the data from the weather station. The agent uses the data in the |
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+# database to generate graphic charts for display in the weather station |
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+# web page. |
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+# |
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+# Copyright 2020 Jeff Owrey |
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+# This program is free software: you can redistribute it and/or modify |
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+# it under the terms of the GNU General Public License as published by |
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+# the Free Software Foundation, either version 3 of the License, or |
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+# (at your option) any later version. |
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+# |
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+# This program is distributed in the hope that it will be useful, |
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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+# GNU General Public License for more details. |
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+# |
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+# You should have received a copy of the GNU General Public License |
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+# along with this program. If not, see http://www.gnu.org/license. |
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+# |
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+# Revision History |
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+# * v10 released 11 Jan 2020 by J L Owrey |
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+# |
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+import os |
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+import time |
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+import subprocess |
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+ |
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+ ### DEFINE FILE LOCATIONS ### |
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+ |
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+_USER = os.environ['USER'] |
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+# the file that stores the data |
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+_RRD_FILE = "/home/%s/database/arednsigData.rrd" % _USER |
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+_RRD_SIZE_IN_DAYS = 370 # days |
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+_1YR_RRA_STEPS_PER_DAY = 96 |
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+_DATABASE_UPDATE_INTERVAL = 60 |
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+ |
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+def createRrdFile(): |
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+ """Create the rrd file if it does not exist. |
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+ Parameters: none |
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+ Returns: True, if successful |
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+ """ |
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+ |
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+ if os.path.exists(_RRD_FILE): |
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+ print "aredn node database already exists" |
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+ return True |
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+ |
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+ ## Calculate database size |
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+ |
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+ heartBeat = 2 * _DATABASE_UPDATE_INTERVAL |
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+ rra1yrNumPDP = int(round(86400 / (_1YR_RRA_STEPS_PER_DAY * \ |
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+ _DATABASE_UPDATE_INTERVAL))) |
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+ rrd24hrNumRows = int(round(86400 / _DATABASE_UPDATE_INTERVAL)) |
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+ rrd1yearNumRows = _1YR_RRA_STEPS_PER_DAY * _RRD_SIZE_IN_DAYS |
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+ |
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+ strFmt = ("rrdtool create %s --start now-1day --step %s "
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+ "DS:S:GAUGE:%s:U:U DS:N:GAUGE:%s:U:U DS:SNR:GAUGE:%s:U:U " |
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+ "DS:RX_MCS:GAUGE:%s:U:U DS:TX_MCS:GAUGE:%s:U:U " |
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+ "DS:RX_RATE:GAUGE:%s:U:U DS:TX_RATE:GAUGE:%s:U:U " |
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+ "RRA:LAST:0.5:1:%s RRA:LAST:0.5:%s:%s") |
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+ |
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+ strCmd = strFmt % (_RRD_FILE, _DATABASE_UPDATE_INTERVAL, \ |
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+ heartBeat, heartBeat, heartBeat, heartBeat, \ |
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+ heartBeat, heartBeat, heartBeat, \ |
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+ rrd24hrNumRows, rra1yrNumPDP, rrd1yearNumRows) |
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+ |
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+ print "creating aredn node database...\n\n%s\n" % strCmd |
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+ |
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+ # Spawn a sub-shell and run the command |
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+ try: |
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+ subprocess.check_output(strCmd, stderr=subprocess.STDOUT, \ |
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+ shell=True) |
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+ except subprocess.CalledProcessError, exError: |
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+ print "rrdtool create failed: %s" % (exError.output) |
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+ return False |
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+ return True |
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+##end def |
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+ |
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+def main(): |
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+ createRrdFile() |
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+## end def |
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+ |
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+if __name__ == '__main__': |
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+ main() |
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+ |