Mercurial > treepkg > treepkg

annotate treepkg/status.py @ 31:47d69e5d8ace

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merge
author Bernhard Herzog <bh@intevation.de>
date Thu, 15 Mar 2007 11:42:03 +0100
parents beec3ed6e0df efdd39f58a61
children 1fefedfb77df
rev   line source
12
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1 # Copyright (C) 2007 by Intevation GmbH
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2 # Authors:
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3 # Bernhard Herzog <bh@intevation.de>
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4 #
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5 # This program is free software under the GPL (>=v2)
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6 # Read the file COPYING coming with the software for details.
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7
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8 import os
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9 import datetime
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10 import time
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11
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12 import util
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13
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14
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15 # special object to indicate no default value
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16 nodefault = object()
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17
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18
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19 class FieldDesc(object):
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20
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21 def __init__(self, default=nodefault):
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22 self.default = default
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23
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24 def has_default(self):
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25 return self.default is not nodefault
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26
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27 def serialize(self, value):
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28 raise NotImplementedError
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29
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30 def deserialize(self, string):
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31 raise NotImplementedError
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32
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33
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34 class StringFieldDesc(FieldDesc):
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35
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36 def serialize(self, value):
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37 return str(value)
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38
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39 def deserialize(self, value):
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40 return value.strip()
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41
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42
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43 class DateFieldDesc(FieldDesc):
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44
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45 date_format = "%Y-%m-%d %H:%M:%S"
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46
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47 def serialize(self, value):
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48 return value.strftime(self.date_format)
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49
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50 def deserialize(self, string):
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51 return datetime.datetime(*time.strptime(string.strip(),
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52 self.date_format)[:6])
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53
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54
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55 class Status(object):
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56
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57 fields = dict(status=StringFieldDesc(default="unknown"),
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58 start=DateFieldDesc(default=None),
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59 stop=DateFieldDesc(default=None))
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60
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61 attrs = set(["filename", "values"])
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62
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63 magic = "TreePackagerStatus 0.0\n"
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64
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65 def __init__(self, filename):
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66 assert os.path.isabs(filename)
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67 self.filename = filename
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68 self.read()
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69
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70 def _init_values(self):
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71 self.values = {}
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72
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73 def read(self):
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74 self._init_values()
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75 if not os.path.exists(self.filename):
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76 return
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77 f = open(self.filename)
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78 try:
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79 magic = f.next()
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80 if magic != self.magic:
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81 raise ValueError("File %r has wrong magic" % self.filename)
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82 for line in f:
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83 field, value = line.split(":", 1)
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84 self.values[field] = self.fields[field].deserialize(value)
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85 finally:
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86 f.close()
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87
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88 def write(self):
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89 lines = [self.magic]
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90 for field, desc in self.fields.items():
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91 if field in self.values:
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92 lines.append("%s: %s\n"
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93 % (field, desc.serialize(self.values[field])))
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94 util.writefile(self.filename, "".join(lines))
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95
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96 def __getattr__(self, attr):
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97 desc = self.fields.get(attr)
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98 if desc is not None:
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99 if attr in self.values:
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100 return self.values[attr]
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101 elif desc.has_default():
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102 return desc.default
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103 raise AttributeError(attr)
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104
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105 def __setattr__(self, attr, value):
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106 if attr in self.fields:
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107 self.values[attr] = value
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108 self.write()
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109 elif attr in self.attrs:
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110 self.__dict__[attr] = value
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111 else:
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112 raise AttributeError(attr)
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