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annotate Lib/Bastion.py @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 3e77d6637a2b
children fb4b4d069cc7
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1 """Bastionification utility.
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2
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3 A bastion (for another object -- the 'original') is an object that has
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4 the same methods as the original but does not give access to its
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5 instance variables. Bastions have a number of uses, but the most
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6 obvious one is to provide code executing in restricted mode with a
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7 safe interface to an object implemented in unrestricted mode.
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8
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9 The bastionification routine has an optional second argument which is
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10 a filter function. Only those methods for which the filter method
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11 (called with the method name as argument) returns true are accessible.
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12 The default filter method returns true unless the method name begins
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13 with an underscore.
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14
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15 There are a number of possible implementations of bastions. We use a
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16 'lazy' approach where the bastion's __getattr__() discipline does all
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17 the work for a particular method the first time it is used. This is
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18 usually fastest, especially if the user doesn't call all available
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19 methods. The retrieved methods are stored as instance variables of
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20 the bastion, so the overhead is only occurred on the first use of each
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21 method.
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22
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23 Detail: the bastion class has a __repr__() discipline which includes
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24 the repr() of the original object. This is precomputed when the
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25 bastion is created.
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26
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27 """
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28
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29
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30 from types import MethodType
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31
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32
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33 class BastionClass:
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34
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35 """Helper class used by the Bastion() function.
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36
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37 You could subclass this and pass the subclass as the bastionclass
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38 argument to the Bastion() function, as long as the constructor has
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39 the same signature (a get() function and a name for the object).
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40
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41 """
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42
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43 def __init__(self, get, name):
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44 """Constructor.
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45
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46 Arguments:
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47
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48 get - a function that gets the attribute value (by name)
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49 name - a human-readable name for the original object
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50 (suggestion: use repr(object))
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51
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52 """
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53 self._get_ = get
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54 self._name_ = name
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55
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56 def __repr__(self):
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57 """Return a representation string.
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58
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59 This includes the name passed in to the constructor, so that
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60 if you print the bastion during debugging, at least you have
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61 some idea of what it is.
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62
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63 """
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64 return "<Bastion for %s>" % self._name_
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65
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66 def __getattr__(self, name):
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67 """Get an as-yet undefined attribute value.
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68
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69 This calls the get() function that was passed to the
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70 constructor. The result is stored as an instance variable so
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71 that the next time the same attribute is requested,
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72 __getattr__() won't be invoked.
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73
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74 If the get() function raises an exception, this is simply
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75 passed on -- exceptions are not cached.
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76
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77 """
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78 attribute = self._get_(name)
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79 self.__dict__[name] = attribute
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80 return attribute
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81
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82
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83 def Bastion(object, filter = lambda name: name[:1] != '_',
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84 name=None, bastionclass=BastionClass):
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85 """Create a bastion for an object, using an optional filter.
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86
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87 See the Bastion module's documentation for background.
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88
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89 Arguments:
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90
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91 object - the original object
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92 filter - a predicate that decides whether a function name is OK;
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93 by default all names are OK that don't start with '_'
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94 name - the name of the object; default repr(object)
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95 bastionclass - class used to create the bastion; default BastionClass
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96
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97 """
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98
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99 # Note: we define *two* ad-hoc functions here, get1 and get2.
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100 # Both are intended to be called in the same way: get(name).
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101 # It is clear that the real work (getting the attribute
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102 # from the object and calling the filter) is done in get1.
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103 # Why can't we pass get1 to the bastion? Because the user
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104 # would be able to override the filter argument! With get2,
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105 # overriding the default argument is no security loophole:
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106 # all it does is call it.
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107 # Also notice that we can't place the object and filter as
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108 # instance variables on the bastion object itself, since
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109 # the user has full access to all instance variables!
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110
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111 def get1(name, object=object, filter=filter):
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112 """Internal function for Bastion(). See source comments."""
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113 if filter(name):
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114 attribute = getattr(object, name)
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115 if type(attribute) == MethodType:
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116 return attribute
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117 raise AttributeError, name
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118
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119 def get2(name, get1=get1):
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120 """Internal function for Bastion(). See source comments."""
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121 return get1(name)
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122
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123 if name is None:
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124 name = `object`
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125 return bastionclass(get2, name)
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126
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127
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128 def _test():
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129 """Test the Bastion() function."""
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130 class Original:
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131 def __init__(self):
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132 self.sum = 0
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133 def add(self, n):
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134 self._add(n)
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135 def _add(self, n):
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136 self.sum = self.sum + n
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137 def total(self):
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138 return self.sum
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139 o = Original()
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140 b = Bastion(o)
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141 testcode = """if 1:
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142 b.add(81)
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143 b.add(18)
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144 print "b.total() =", b.total()
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145 try:
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146 print "b.sum =", b.sum,
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Guido van Rossum <guido@python.org>
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147 except:
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148 print "inaccessible"
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149 else:
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150 print "accessible"
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Guido van Rossum <guido@python.org>
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151 try:
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152 print "b._add =", b._add,
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153 except:
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154 print "inaccessible"
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Guido van Rossum <guido@python.org>
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155 else:
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Guido van Rossum <guido@python.org>
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156 print "accessible"
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157 try:
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158 print "b._get_.func_defaults =", b._get_.func_defaults,
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159 except:
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160 print "inaccessible"
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parents: 3671
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161 else:
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162 print "accessible"
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163 \n"""
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164 exec testcode
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165 print '='*20, "Using rexec:", '='*20
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166 import rexec
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167 r = rexec.RExec()
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168 m = r.add_module('__main__')
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169 m.b = b
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170 r.r_exec(testcode)
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171
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172
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173 if __name__ == '__main__':
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174 _test()