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annotate py/params.py @ 579:4a6e75ed2ed4

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fix gpio chown script
author Matt Johnston <matt@ucc.asn.au>
date Mon, 30 Nov 2015 21:40:45 +0800
parents 54ef7f84487d
children
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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 tempfile
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6 import os
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7 import binascii
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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 import utils
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12
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13 _FIELD_DEFAULTS = {
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14 'fridge_setpoint': 16,
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15 'fridge_difference': 0.2,
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16 'overshoot_delay': 720, # 12 minutes
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17 'overshoot_factor': 1, # ºC
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18 'disabled': False,
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19 'nowort': False,
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20 'fridge_range_lower': 3,
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21 'fridge_range_upper': 3,
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22 }
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23
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24 class Params(dict):
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25 class Error(Exception):
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26 pass
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27
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28 def __init__(self):
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29 self.update(_FIELD_DEFAULTS)
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30 self._set_epoch(None)
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31
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32 def __getattr__(self, k):
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33 return self[k]
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34
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35 def __setattr__(self, k, v):
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36 # fail if we set a bad value
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37 self[k]
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38 self[k] = v
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39
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40 def _set_epoch(self, epoch):
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41 # since __setattr__ is overridden
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42 object.__setattr__(self, '_epoch', epoch)
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43
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44 def _do_load(self, f):
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45 try:
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46 u = utils.json_load_round_float(f.read())
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47 except Exception as 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 # new epoch, 120 random bits
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57 self._set_epoch(binascii.hexlify(os.urandom(15)).decode())
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58
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59 L("Loaded parameters")
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60 L(self.save_string())
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61
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62 def load(self, f = None):
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63 if f:
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64 return self._do_load(f)
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65 else:
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66 with open(config.PARAMS_FILE, 'r') as f:
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67 try:
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68 return self._do_load(f)
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69 except IOError as e:
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70 W("Missing parameter file, using defaults. %s" % str(e))
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71 return
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72
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73 def get_epoch(self):
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74 return self._epoch
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75
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76 def receive(self, params, epoch):
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77 """ updates parameters from the server. does some validation,
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78 writes config file to disk.
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79 Returns True on success, False failure
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80 """
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81
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82 if epoch != self._epoch:
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83 return
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84
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85 def same_type(a, b):
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86 ta = type(a)
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87 tb = type(b)
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88
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89 if ta == int:
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90 ta = float
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91 if tb == int:
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92 tb = float
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93
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94 return ta == tb
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95
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96 if self.keys() != params.keys():
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97 diff = self.keys() ^ params.keys()
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98 E("Mismatching params, %s" % str(diff))
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99 return False
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100
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101 for k, v in params.items():
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102 if not same_type(v, self[k]):
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103 E("Bad type for %s" % k)
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104 return False
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105
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106 dir = os.path.dirname(config.PARAMS_FILE)
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107 try:
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108 t = tempfile.NamedTemporaryFile(prefix='config',
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109 mode='w+t', # NamedTemporaryFile is binary by default
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110 dir = dir,
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111 delete = False)
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112
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113 out = json.dumps(params, sort_keys=True, indent=4)+'\n'
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114 t.write(out)
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115 name = t.name
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116 t.close()
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117
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118 os.rename(name, config.PARAMS_FILE)
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119 except Exception as e:
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120 EX("Problem: %s" % e)
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121 return False
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122
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123 self.update(params)
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124 L("Received parameters")
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125 L(self.save_string())
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126 return True
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127
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128 def save_string(self):
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129 return json.dumps(self, sort_keys=True, indent=4)