annotate py/params.py @ 157:6d799bee3508

reload config on SIGHUP
author Matt Johnston <matt@ucc.asn.au>
date Thu, 03 Jan 2013 20:12:07 +0800
parents d03157c7ad60
children 256505f98c4d
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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, # ÂșC
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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))