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comparison py/params.py @ 259:26eee8591f61

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long polling works
author Matt Johnston <matt@ucc.asn.au>
date Tue, 09 Jun 2015 23:27:44 +0800
parents 0a1b642e3086
children ef3a75128116
comparison
equal deleted inserted replaced
256:6d06795aefbb 259:26eee8591f61
1 # -*- coding: utf-8 -*- 1 # -*- coding: utf-8 -*-
2 import collections 2 import collections
3 import json 3 import json
4 import signal 4 import signal
5 import io
6 import tempfile 5 import tempfile
6 import os
7 import binascii
7 8
8 import config 9 import config
9 from utils import W,L,E,EX 10 from utils import W,L,E,EX
10 import utils 11 import utils
11 12
24 class Error(Exception): 25 class Error(Exception):
25 pass 26 pass
26 27
27 def __init__(self): 28 def __init__(self):
28 self.update(_FIELD_DEFAULTS) 29 self.update(_FIELD_DEFAULTS)
29 self._epoch = None 30 self._set_epoch(None)
30 31
31 def __getattr__(self, k): 32 def __getattr__(self, k):
32 return self[k] 33 return self[k]
33 34
34 def __setattr__(self, k, v): 35 def __setattr__(self, k, v):
35 # fail if we set a bad value 36 # fail if we set a bad value
36 self[k] 37 self[k]
37 self[k] = v 38 self[k] = v
38 39
40 def _set_epoch(self, epoch):
41 # since __setattr__ is overridden
42 object.__setattr__(self, '_epoch', epoch)
43
39 def _do_load(self, f): 44 def _do_load(self, f):
40 try: 45 try:
41 u = json.load(f) 46 u = utils.json_load_round_float(f.read())
42 except Exception as e: 47 except Exception as e:
43 raise self.Error(e) 48 raise self.Error(e)
44 49
45 for k in u: 50 for k in u:
46 if k.startswith('_'): 51 if k.startswith('_'):
47 continue 52 continue
48 if k not in self: 53 if k not in self:
49 raise self.Error("Unknown parameter %s=%s in file '%s'" % (str(k), str(u[k]), getattr(f, 'name', '???'))) 54 raise self.Error("Unknown parameter %s=%s in file '%s'" % (str(k), str(u[k]), getattr(f, 'name', '???')))
50 self.update(u) 55 self.update(u)
51 self._epoch = utils.hexnonce() 56 # new epoch, 120 random bits
57 self._set_epoch(binascii.hexlify(os.urandom(15)).decode())
52 58
53 L("Loaded parameters") 59 L("Loaded parameters")
54 L(self.save_string()) 60 L(self.save_string())
55 61
56 def load(self, f = None): 62 def load(self, f = None):
85 if tb == int: 91 if tb == int:
86 tb = float 92 tb = float
87 93
88 return ta == tb 94 return ta == tb
89 95
90 if self.keys() != new_params.keys(): 96 if self.keys() != params.keys():
91 diff = self.keys() ^ new_params.keys() 97 diff = self.keys() ^ params.keys()
92 E("Mismatching params, %s" % str(diff)) 98 E("Mismatching params, %s" % str(diff))
93 return False 99 return False
94 100
95 for k, v in new_params.items(): 101 for k, v in params.items():
96 if not same_type(v, self[k]): 102 if not same_type(v, self[k]):
97 E("Bad type for %s" % k) 103 E("Bad type for %s" % k)
98 return False 104 return False
99 105
100 dir = os.path.dirname(config.PARAMS_FILE) 106 dir = os.path.dirname(config.PARAMS_FILE)
101 try: 107 try:
102 t = tempfile.NamedTemporaryFile(prefix='config', 108 t = tempfile.NamedTemporaryFile(prefix='config',
109 mode='w+t',
103 dir = dir, 110 dir = dir,
104 delete = False) 111 delete = False)
105 112
106 t.write(json.dumps(new_params, sort_keys=True, indent=4)+'\n') 113 out = json.dumps(params, sort_keys=True, indent=4)+'\n'
114 t.write(out)
107 name = t.name 115 name = t.name
108 t.close() 116 t.close()
109 117
110 os.rename(name, config.PARAMS_FILE) 118 os.rename(name, config.PARAMS_FILE)
111 return True 119 return True
112 except Exception as e: 120 except Exception as e:
113 E("Problem: %s" % e) 121 EX("Problem: %s" % e)
114 return False 122 return False
115 123
116 def save_string(self): 124 def save_string(self):
117 return json.dumps(self, sort_keys=True, indent=4) 125 return json.dumps(self, sort_keys=True, indent=4)