annotate py/params.py @ 529:5201f441bf4a

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author Matt Johnston <matt@ucc.asn.au>
date Fri, 10 Apr 2015 23:59:16 +0800
parents dd8895652485
children e39ed85d87a5
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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 io
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6
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7 import config
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8 from utils import W,L,E,EX
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9
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10 _FIELD_DEFAULTS = {
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11 'fridge_setpoint': 16,
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12 'fridge_difference': 0.2,
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13 'overshoot_delay': 720, # 12 minutes
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14 'overshoot_factor': 1, # ÂșC
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15 'disabled': False,
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16 'nowort': False,
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17 'fridge_range_lower': 3,
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18 'fridge_range_upper': 3,
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19 }
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20
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21 class Params(dict):
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22 class Error(Exception):
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23 pass
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24
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25 def __init__(self):
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26 self.update(_FIELD_DEFAULTS)
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27
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28 def __getattr__(self, k):
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29 return self[k]
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30
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31 def __setattr__(self, k, v):
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32 # fail if we set a bad value
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33 self[k]
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34 self[k] = v
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35
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36 def load(self, f = None):
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37 if not f:
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38 try:
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39 f = file(config.PARAMS_FILE, 'r')
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40 except IOError as e:
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41 W("Missing parameter file, using defaults. %s", e)
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42 return
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43 try:
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44 u = json.load(f)
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45 except Exception as e:
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46 raise self.Error(e)
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47
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48 for k in u:
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49 if k.startswith('_'):
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50 continue
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51 if k not in self:
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52 raise self.Error("Unknown parameter %s=%s in file '%s'" % (str(k), str(u[k]), getattr(f, 'name', '???')))
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53 self.update(u)
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54
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55 L("Loaded parameters")
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56 L(self.save_string())
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57
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58
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59 def save(self, f = None):
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60 if not f:
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61 f = file(config.PARAMS_FILE, 'w')
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62 json.dump(self, f, sort_keys=True, indent=4)
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63 f.write('\n')
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64 f.flush()
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65
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66 def save_string(self):
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67 s = io.StringIO()
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68 self.save(s)
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69 return s.getvalue()