annotate pw2log.py @ 5:c02b765b4eb3 default tip

Add grafana dashboard configuration.
author Daniel O'Connor <darius@dons.net.au>
date Fri, 21 Jul 2023 19:57:53 +0930
parents 8990981c60a0
children
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1 #!/usr/bin/env python3
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2
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3 import configparser
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4 import daemon
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5 import daemon.pidfile
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6 import datetime
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7 import logging
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8 from logging.handlers import RotatingFileHandler
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9 import psycopg2
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10 import requests
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11 import sys
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12 # https://github.com/jrester/tesla_powerwall
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13 from tesla_powerwall import APIError, Powerwall
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14 import time
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15
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16 # Standard in 3.7..
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17 class NullContextManager(object):
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18 def __init__(self, dummy_resource=None):
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19 self.dummy_resource = dummy_resource
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20 def __enter__(self):
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21 return self.dummy_resource
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22 def __exit__(self, *args):
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23 pass
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24
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25 # Otherwise it's very noisy
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26 logging.getLogger('tesla_powerwall').setLevel(logging.WARN)
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27
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28 def main():
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29 if len(sys.argv) != 2:
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30 print('Bad usage', file = sys.stderr)
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31 print('\t%s conf.ini' % (sys.argv[0]), file = sys.stderr)
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32 sys.exit(1)
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33
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34 cp = configparser.ConfigParser()
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35 cp.read(sys.argv[1])
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36 if not cp.has_section('db'):
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37 print('Config file missing db section', file = sys.stderr)
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38 sys.exit(1)
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39 if not cp.has_option('db', 'dsn'):
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40 print('db section missing dsn parameter', file = sys.stderr)
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41 sys.exit(1)
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42 if not cp.has_option('db', 'logtime'):
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43 print('db section missing logtime parameter', file = sys.stderr)
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44 sys.exit(1)
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45
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46 if not cp.has_section('pw'):
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47 print('Config file missing pw section', file = sys.stderr)
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48 sys.exit(1)
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49 for opt in ('ip', 'username', 'password'):
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50 if not cp.has_option('pw', opt):
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51 print('pw section missing %s parameter' % (opt,), file = sys.stderr)
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52 sys.exit(1)
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53
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54 if cp.has_option('pw2log', 'logfile'):
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55 logfile = cp.get('pw2log', 'logfile')
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56 else:
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57 logfile = None
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58 if cp.has_option('pw2log', 'pidfile'):
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59 pidfile = cp.get('pw2log', 'pidfile')
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60 else:
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61 pidfile = None
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62
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63 global logger
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64 logger = logging.getLogger('pw2log')
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65 logger.setLevel(logging.WARN)
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66 fmt = logging.Formatter('%(asctime)s: %(message)s', datefmt = '%Y/%m/%d %H:%M:%S')
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67 if logfile == None:
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68 ch = logging.StreamHandler()
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69 ch.setFormatter(fmt)
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70 logger.addHandler(ch)
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71 keepfh = None
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72 else:
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73 fh = RotatingFileHandler(logfile, maxBytes = 2000, backupCount = 10)
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74 fh.setFormatter(fmt)
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75 logger.addHandler(fh)
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76 keepfhs = [fh.stream.fileno()] # XXX: gross
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77
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78 if pidfile == None:
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79 ctx = NullContextManager()
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80 else:
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81 try:
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82 #fh = open('/tmp/pw2errs.log', 'a')
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83 fh = None
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84 ctx = daemon.DaemonContext(pidfile = daemon.pidfile.PIDLockFile(pidfile), stdout = fh, stderr = fh, files_preserve = keepfhs)
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85 except Exception as e:
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86 logger.critical('Unable to get daemon context')
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87
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88 try:
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89 with ctx:
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90 logger.critical('Starting')
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91 try:
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92 collectdata(cp.get('pw', 'ip'), cp.get('pw', 'username'), cp.get('pw', 'password'), cp.get('db', 'dsn'), cp.getint('db', 'logtime'))
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93 except Exception as e:
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94 logger.critical('Unable to collect data: ' + str(e))
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95 except Exception as e:
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96 logger.critical('Unable to enter daemon context: ' + str(e))
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97
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98 def collectdata(pwip, username, password, dsn, logtime):
0
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99 dbh = psycopg2.connect(dsn)
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100 cur = dbh.cursor()
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101 pw = None
0
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102
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103 while True:
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104 try:
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105 # As per.. https://github.com/vloschiavo/powerwall2
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106 # | | Load | Grid | Battery | Solar |
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107 # |==========+==============+===================+======================+==================|
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108 # | Positive | Supply house | Drawing from grid | Drawing from battery | Solar generation |
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109 # | Negative | n/a | Feeding grid | Charging battery | n/a |
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110 #
2
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111 if not pw:
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112 first = True
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113 pw = Powerwall(pwip)
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114 pw.login(password, username)
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115 meters = pw.get_meters()
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116 grid_volts = meters.site.average_voltage
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117 grid_freq = meters.site.frequency
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118 grid_power = meters.site.instant_power
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119 load_power = meters.load.instant_power
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120 battery_power = meters.battery.instant_power
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121 solar_power = meters.solar.instant_power
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122 charge = pw.get_charge()
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123 except Exception as e:
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124 pw = None
0
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125 logger.error('Error communicating with Powerwall: ' + str(e))
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126 time.sleep(300)
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127 continue
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128 try:
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129 cur.execute('INSERT INTO pw2 (date, grid_voltage, grid_freq, grid_power, load_power, battery_power, battery_charge, solar_power) VALUES (%s, %s, %s, %s, %s, %s, %s, %s)',
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130 (datetime.datetime.now(), grid_volts, grid_freq, grid_power, load_power, battery_power, charge, solar_power))
0
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131 dbh.commit()
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132 except psycopg2.OperationalError as e:
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133 logger.error('Reconnecting after database error:' + str(e))
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134 time.sleep(60)
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135 dbh = psycopg2.connect(dsn)
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136 cur = dbh.cursor()
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137 continue
2
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138 if first:
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139 logger.error('Logged OK')
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140 first = False
0
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141
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142 time.sleep(logtime)
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143
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144 def createdb(dbh):
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145 cur = dbh.cursor()
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146 cur.execute('''
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147 CREATE TABLE pw2 (
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148 date TIMESTAMP WITH TIME ZONE PRIMARY KEY,
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149 grid_voltage REAL,
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150 grid_freq REAL,
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151 grid_power REAL,
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152 load_power REAL,
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153 battery_power REAL,
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154 battery_charge REAL,
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155 solar_power REAL
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156 );
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157 ''')
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158 cur.execute('''
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159 CREATE INDEX IF NOT EXISTS pw2_date_brin_idx ON pw2 USING brin (date);
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160 ''')
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161
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162 if __name__ == '__main__':
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163 main()