Mercurial > templog
annotate py/params.py @ 162:d73077e8cd67
Add daemon mode with locking, add "disabled" parameter
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Fri, 11 Jan 2013 23:41:56 +0800 |
| parents | 256505f98c4d |
| children | 5d5424acfed0 |
| rev | line source |
|---|---|
| 145 | 1 # -*- coding: utf-8 -*- |
| 2 import collections | |
| 3 import json | |
| 157 | 4 import signal |
| 160 | 5 import StringIO |
| 157 | 6 |
| 7 import gevent | |
| 8 | |
| 145 | 9 import config |
| 148 | 10 from utils import W,L,E,EX |
| 145 | 11 |
| 12 _FIELD_DEFAULTS = { | |
| 13 'fridge_setpoint': 16, | |
| 14 'fridge_difference': 0.2, | |
| 15 'overshoot_delay': 720, # 12 minutes | |
| 16 'overshoot_factor': 1, # ºC | |
|
162
d73077e8cd67
Add daemon mode with locking, add "disabled" parameter
Matt Johnston <matt@ucc.asn.au>
parents:
160
diff
changeset
|
17 'disabled': False, |
| 145 | 18 } |
| 19 | |
| 20 class Params(dict): | |
| 21 class Error(Exception): | |
| 22 pass | |
| 23 | |
| 24 def __init__(self): | |
| 25 self.update(_FIELD_DEFAULTS) | |
| 157 | 26 gevent.signal(signal.SIGHUP, self.reload_signal) |
| 145 | 27 |
| 28 def __getattr__(self, k): | |
| 29 return self[k] | |
| 30 | |
| 31 def __setattr__(self, k, v): | |
| 32 # fail if we set a bad value | |
| 33 self[k] | |
| 34 self[k] = v | |
| 35 | |
| 36 def load(self, f = None): | |
| 37 if not f: | |
| 148 | 38 try: |
| 39 f = file(config.PARAMS_FILE, 'r') | |
| 40 except IOError, e: | |
| 41 W("Missing parameter file, using defaults. %s", e) | |
| 42 return | |
| 157 | 43 try: |
| 44 u = json.load(f) | |
| 45 except Exception, e: | |
| 46 raise self.Error(e) | |
| 47 | |
| 145 | 48 for k in u: |
| 49 if k not in self: | |
| 50 raise self.Error("Unknown parameter %s=%s in file '%s'" % (str(k), str(u[k]), getattr(f, 'name', '???'))) | |
| 51 self.update(u) | |
| 52 | |
| 160 | 53 L("Loaded parameters") |
| 54 L(self.save_string()) | |
| 55 | |
| 56 | |
| 145 | 57 def save(self, f = None): |
| 58 if not f: | |
| 59 f = file(config.PARAMS_FILE, 'w') | |
| 60 json.dump(self, f, sort_keys=True, indent=4) | |
| 155 | 61 f.write('\n') |
| 145 | 62 f.flush() |
| 157 | 63 |
| 160 | 64 def save_string(self): |
| 65 s = StringIO.StringIO() | |
| 66 self.save(s) | |
| 67 return s.getvalue() | |
| 68 | |
| 157 | 69 def reload_signal(self): |
| 70 try: | |
| 71 self.load() | |
| 160 | 72 L("Reloaded.") |
| 157 | 73 except self.Error, e: |
| 74 W("Problem reloading: %s" % str(e)) |