annotate py/params.py @ 518:0b5ff341d124

sleep on a semaphore so it can start/stop immediately when there's a SIGHUP from the web UI. makes it seem more magical.
author Matt Johnston <matt@ucc.asn.au>
date Fri, 19 Dec 2014 21:52:50 +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
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30 def __getattr__(self, k):
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31 return self[k]
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32
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33 def __setattr__(self, k, v):
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34 # fail if we set a bad value
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35 self[k]
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36 self[k] = v
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37
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38 def load(self, f = None):
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39 if not f:
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40 try:
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41 f = file(config.PARAMS_FILE, 'r')
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42 except IOError, e:
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43 W("Missing parameter file, using defaults. %s", e)
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44 return
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45 try:
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46 u = json.load(f)
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47 except Exception, e:
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48 raise self.Error(e)
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49
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50 for k in u:
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51 if k.startswith('_'):
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52 continue
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53 if k not in self:
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54 raise self.Error("Unknown parameter %s=%s in file '%s'" % (str(k), str(u[k]), getattr(f, 'name', '???')))
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55 self.update(u)
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56
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57 L("Loaded parameters")
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58 L(self.save_string())
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59
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60
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61 def save(self, f = None):
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62 if not f:
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63 f = file(config.PARAMS_FILE, 'w')
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64 json.dump(self, f, sort_keys=True, indent=4)
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65 f.write('\n')
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66 f.flush()
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67
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68 def save_string(self):
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69 s = StringIO.StringIO()
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70 self.save(s)
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71 return s.getvalue()