annotate py/params.py @ 507:3a3cbda62a9e

Add readme
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Mar 2014 20:31:54 +0800
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1 # -*- coding: utf-8 -*-
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2 import collections
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3 import json
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4 import signal
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5 import StringIO
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6
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7 import gevent
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8
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9 import config
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10 from utils import W,L,E,EX
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11
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12 _FIELD_DEFAULTS = {
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13 'fridge_setpoint': 16,
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14 'fridge_difference': 0.2,
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15 'overshoot_delay': 720, # 12 minutes
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16 'overshoot_factor': 1, # ÂșC
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17 'disabled': False,
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18 'nowort': False,
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19 'fridge_range_lower': 3,
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20 'fridge_range_upper': 3,
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21 }
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22
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23 class Params(dict):
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24 class Error(Exception):
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25 pass
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26
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27 def __init__(self):
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28 self.update(_FIELD_DEFAULTS)
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29 gevent.signal(signal.SIGHUP, self.reload_signal)
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30
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31 def __getattr__(self, k):
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32 return self[k]
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33
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34 def __setattr__(self, k, v):
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35 # fail if we set a bad value
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36 self[k]
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37 self[k] = v
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38
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39 def load(self, f = None):
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40 if not f:
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41 try:
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42 f = file(config.PARAMS_FILE, 'r')
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43 except IOError, e:
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44 W("Missing parameter file, using defaults. %s", e)
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45 return
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46 try:
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47 u = json.load(f)
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48 except Exception, e:
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49 raise self.Error(e)
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50
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51 for k in u:
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52 if k.startswith('_'):
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53 continue
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54 if k not in self:
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55 raise self.Error("Unknown parameter %s=%s in file '%s'" % (str(k), str(u[k]), getattr(f, 'name', '???')))
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56 self.update(u)
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57
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58 L("Loaded parameters")
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59 L(self.save_string())
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60
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61
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62 def save(self, f = None):
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63 if not f:
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64 f = file(config.PARAMS_FILE, 'w')
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65 json.dump(self, f, sort_keys=True, indent=4)
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66 f.write('\n')
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67 f.flush()
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68
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69 def save_string(self):
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70 s = StringIO.StringIO()
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71 self.save(s)
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72 return s.getvalue()
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73
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74 def reload_signal(self):
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75 try:
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76 self.load()
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77 L("Reloaded.")
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78 except self.Error, e:
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79 W("Problem reloading: %s" % str(e))