filter_meteo.py

   1 #!/usr/bin/python
   2
   3 import MySQLdb
   4 import ConfigParser
   5 import sys
   6
   7 from pprint import pprint
   8 import datetime
   9
  10 import numpy as np
  11
  12 import scipy.signal
  13
  14 global database
  15
  16 def GetTables():
  17   if database:
  18     c = database.cursor()
  19     c.execute("SELECT s.id sid,p.id pid FROM sensors s,st_parameters p where s.st_id=p.st_id and p.id>=0")
  20     return c.fetchall()
  21   else:
  22     print "No connection to DB"
  23     exit()
  24
  25 def Today():
  26   dt = datetime.datetime.now()
  27   d_truncated = datetime.date(dt.year, dt.month, dt.day)
  28   return d_truncated
  29
  30 def Tomorrow():
  31   dt = Today()
  32   return dt + datetime.timedelta(days=1)
  33
  34 def Yesterday():
  35   dt = Today()
  36   return dt - datetime.timedelta(days=1)
  37
  38 def GetData(sid,pid,fromDate=Yesterday(),toDate=Today()):
  39   if database:
  40     c = database.cursor()
  41     c.execute("SELECT id,timestamp,value FROM sensor_values WHERE sensor_id=%s and parameter_id=%s and timestamp>=%s AND timestamp<%s",[sid,pid,fromDate.strftime('%Y-%m-%d %H:%M:%S'),toDate.strftime('%Y-%m-%d %H:%M:%S')])
  42     return c.fetchall()
  43   else:
  44     print "No connection to DB"
  45     exit()
  46
  47 def FixRecord(id,value):
  48   if database:
  49     c = database.cursor()
  50     command="UPDATE sensor_values  SET value={} WHERE id='{}'".format(value,id)
  51     print command
  52     c.execute(command)
  53   else:
  54     print "No connection to DB"
  55     exit()
  56
  57 def ProcessTable(sid,pid):
  58
  59   if not current:
  60     data=GetData(sid,pid)
  61   else:
  62     data=GetData(sid,pid,Today(),Tomorrow())
  63   sID=[]
  64   sTime=[]
  65   sValue=[]
  66   for rec in data:
  67     sID.append(rec[0])
  68     sTime.append(rec[1])
  69     sValue.append(rec[2])
  70   sValue=np.array(sValue)
  71
  72   sValueFilt=scipy.signal.medfilt(sValue,5)
  73
  74   sValueDiff=abs(sValue-sValueFilt)
  75
  76   avg=np.mean(sValueDiff)
  77
  78   print "Average="+str(avg)
  79
  80   for i in range(0,len(sTime)-1):
  81     if sValueDiff[i]>avg*filterThreshold:
  82       print "fixing %s : %5.2f %5.2f %5.2f" % (sTime[i],sValue[i],sValueFilt[i],sValueDiff[i])
  83       FixRecord(sID[i],sValueFilt[i])
  84
  85   database.commit()
  86
  87 if len(sys.argv)==2 and sys.argv[1]=='current':
  88   current=True
  89 else:
  90   current=False
  91
  92
  93 try:
  94
  95   cfg = ConfigParser.RawConfigParser(allow_no_value=True)
  96   cfg.readfp(open('/etc/weathermon.conf'))
  97   dbhost = cfg.get("mysql","host")
  98   dbuser = cfg.get("mysql","user")
  99   dbpasswd = cfg.get("mysql","passwd")
 100   dbdb = cfg.get("mysql","db")
 101
 102   filterWindow = int(cfg.get("filter","window"))
 103   filterThreshold = float(cfg.get("filter","threshold"))
 104
 105 except:
 106
 107   print "Error reading configuration file"
 108   exit()
 109
 110 try:
 111
 112   database = MySQLdb.connect(host=dbhost,user=dbuser,passwd=dbpasswd,db=dbdb,use_unicode=True)
 113   database.set_character_set('utf8')
 114   c = database.cursor()
 115   c.execute('SET NAMES utf8;')
 116
 117   print "Connected..."
 118
 119 except:
 120
 121   print "Error connecting database"
 122   exit()
 123
 124 tables = GetTables()
 125
 126 for sid,pid in tables:
 127
 128   print "Processing sensor %d, parameter %d " % (sid,pid)
 129
 130   ProcessTable(sid,pid)
 131
 132 print "Processed "
 133