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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 |
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6 import gevent |
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7 |
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8 import config |
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9 from utils import W,L,E,EX |
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10 |
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11 _FIELD_DEFAULTS = { |
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12 'fridge_setpoint': 16, |
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13 'fridge_difference': 0.2, |
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14 'overshoot_delay': 720, # 12 minutes |
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15 'overshoot_factor': 1, # ºC |
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16 } |
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17 |
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18 class Params(dict): |
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19 class Error(Exception): |
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20 pass |
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21 |
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22 def __init__(self): |
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23 self.update(_FIELD_DEFAULTS) |
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24 gevent.signal(signal.SIGHUP, self.reload_signal) |
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25 |
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26 def __getattr__(self, k): |
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27 return self[k] |
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28 |
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29 def __setattr__(self, k, v): |
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30 # fail if we set a bad value |
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31 self[k] |
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32 self[k] = v |
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33 |
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34 def load(self, f = None): |
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35 if not f: |
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36 try: |
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37 f = file(config.PARAMS_FILE, 'r') |
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38 except IOError, e: |
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39 W("Missing parameter file, using defaults. %s", e) |
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40 return |
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41 try: |
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42 u = json.load(f) |
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43 except Exception, e: |
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44 raise self.Error(e) |
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45 |
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46 for k in u: |
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47 if k not in self: |
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48 raise self.Error("Unknown parameter %s=%s in file '%s'" % (str(k), str(u[k]), getattr(f, 'name', '???'))) |
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49 self.update(u) |
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50 |
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51 def save(self, f = None): |
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52 if not f: |
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53 f = file(config.PARAMS_FILE, 'w') |
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54 json.dump(self, f, sort_keys=True, indent=4) |
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55 f.write('\n') |
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56 f.flush() |
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57 |
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58 def reload_signal(self): |
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59 try: |
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60 self.load() |
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61 L("Reloaded params") |
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62 except self.Error, e: |
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63 W("Problem reloading: %s" % str(e)) |
