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annotate py/sensor_ds18b20.py @ 510:fa282fb36f04

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author Matt Johnston <matt@ucc.asn.au>
date Thu, 26 Jun 2014 21:44:16 +0800
parents d05b1612e19e
children 16a83e2c97a0
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1 #!/usr/bin/env python2.7
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2
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3 import os
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4 import re
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5
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6 import gevent
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7 import gevent.threadpool
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8
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9 import config
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10 from utils import D,L,W,E,EX
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11
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12 class DS18B20s(gevent.Greenlet):
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13
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14 THERM_RE = re.compile('.* YES\n.*t=(.*)\n', re.MULTILINE)
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15
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16 def __init__(self, server):
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17 gevent.Greenlet.__init__(self)
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18 self.server = server
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19 self.readthread = gevent.threadpool.ThreadPool(1)
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20 self.master_dir = config.SENSOR_BASE_DIR
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21
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22 def do(self):
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23 vals = {}
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24 for n in self.sensor_names():
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25 value = self.do_sensor(n)
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26 if value is not None:
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27 vals[n] = value
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28
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29 itemp = self.do_internal()
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30 if itemp:
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31 vals['internal'] = itemp
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32
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33 self.server.add_reading(vals)
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34
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35 def _run(self):
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36 while True:
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37 self.do()
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38 gevent.sleep(config.SENSOR_SLEEP)
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39
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40 def read_wait(self, f):
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41 # handles a blocking file read with a gevent threadpool. A
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42 # real python thread performs the read while other gevent
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43 # greenlets keep running.
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44 # the ds18b20 takes ~750ms to read, which is noticable
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45 # interactively.
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46 return self.readthread.apply(f.read)
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47
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48 def do_sensor(self, s, contents = None):
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49 """ contents can be set by the caller for testing """
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50 try:
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51 if contents is None:
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52 fn = os.path.join(self.master_dir, s, 'w1_slave')
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53 f = open(fn, 'r')
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54 contents = self.read_wait(f)
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55
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56 match = self.THERM_RE.match(contents)
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57 if match is None:
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58 D("no match")
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59 return None
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60 temp = int(match.groups(1)[0]) / 1000.0
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61 if temp > 80:
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62 E("Problem reading sensor '%s': %f" % (s, temp))
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63 return None
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64 return temp
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65 except Exception, e:
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66 EX("Problem reading sensor '%s': %s" % (s, str(e)))
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67 return None
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68
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69 def do_internal(self):
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70 try:
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71 return int(open(config.INTERNAL_TEMPERATURE, 'r').read()) / 1000.0
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72 except Exception, e:
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73 EX("Problem reading internal sensor: %s" % str(e))
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74 return None
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75
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76
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77 def sensor_names(self):
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78 """ Returns a sequence of sensorname """
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79 slaves_path = os.path.join(self.master_dir, "w1_master_slaves")
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80 contents = open(slaves_path, 'r').read()
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81 if 'not found' in contents:
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82 E("No W1 sensors found")
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83 return []
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84 names = contents.split()
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85 return names
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86
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87 def wort_name(self):
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88 return config.WORT_NAME
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89
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90 def fridge_name(self):
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91 return config.FRIDGE_NAME