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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, # ºC |
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17 } |
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18 |
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19 class Params(dict): |
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20 class Error(Exception): |
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21 pass |
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22 |
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23 def __init__(self): |
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24 self.update(_FIELD_DEFAULTS) |
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25 gevent.signal(signal.SIGHUP, self.reload_signal) |
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26 |
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27 def __getattr__(self, k): |
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28 return self[k] |
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29 |
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30 def __setattr__(self, k, v): |
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31 # fail if we set a bad value |
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32 self[k] |
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33 self[k] = v |
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34 |
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35 def load(self, f = None): |
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36 if not f: |
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37 try: |
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38 f = file(config.PARAMS_FILE, 'r') |
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39 except IOError, e: |
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40 W("Missing parameter file, using defaults. %s", e) |
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41 return |
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42 try: |
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43 u = json.load(f) |
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44 except Exception, e: |
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45 raise self.Error(e) |
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46 |
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47 for k in u: |
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48 if k not in self: |
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49 raise self.Error("Unknown parameter %s=%s in file '%s'" % (str(k), str(u[k]), getattr(f, 'name', '???'))) |
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50 self.update(u) |
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51 |
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52 L("Loaded parameters") |
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53 L(self.save_string()) |
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54 |
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55 |
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56 def save(self, f = None): |
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57 if not f: |
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58 f = file(config.PARAMS_FILE, 'w') |
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59 json.dump(self, f, sort_keys=True, indent=4) |
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60 f.write('\n') |
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61 f.flush() |
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62 |
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63 def save_string(self): |
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64 s = StringIO.StringIO() |
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65 self.save(s) |
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66 return s.getvalue() |
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67 |
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68 def reload_signal(self): |
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69 try: |
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70 self.load() |
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71 L("Reloaded.") |
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72 except self.Error, e: |
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73 W("Problem reloading: %s" % str(e)) |
