Mercurial > hg > pyloader

annotate pyloader/factory.py @ 81:9203ca3a5182

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author Jeff Hammel <jhammel@mozilla.com>
date Sat, 25 Jun 2011 11:05:06 -0700
parents 20bdb8125817
children 58eed691dca7
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1 #!/usr/bin/env python
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2
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3 """
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4 abstract factories
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5 """
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6
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7 import cast
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8 import loader
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9 import os
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10 import sys
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11 from copy import deepcopy
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12 from optparse import OptionParser
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13 from ConfigParser import InterpolationDepthError
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14 from ConfigParser import InterpolationMissingOptionError
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15 from ConfigParser import InterpolationSyntaxError
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16 from ConfigParser import SafeConfigParser as ConfigParser
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17
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18 __all__ = ['CircularReferenceError', 'PyFactory', 'IniFactory']
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20 class CircularReferenceError(Exception):
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21 """factory has detected a circular reference"""
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22
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23 class PyFactory(object):
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24
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25 # to evaluate arguments as objects
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26 delimeters = ('%(', ')s')
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27
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28 def __init__(self, config=None, main=''):
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29 self.main = main # main section
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30 self.configure(config or {})
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31
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32 def configure(self, config):
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33 """load a new configuration"""
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34 # TODO: this should really be a configuration update. If you keep
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35 # track of all "apps" and their parents (i.e. as a ADG)
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36 # you should be able to update only relevent apps
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37 self.config = config
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38 self.seen = set() # already seen apps to note cyclic dependencies
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39 self.parsed = {} # instantiated apps
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40
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41 def load(self, name=None):
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42 """load an object"""
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43
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44 name = name or self.main # load main section by default
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45 assert name in self.config, "'%s' not found in configuration"
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46 if name in self.parsed:
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47 return self.parsed[name]
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48 if name in self.seen:
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49 raise CircularReferenceError('Circular reference! : %s' % name)
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50 self.seen.add(name)
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51
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52 # get section
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53 section = self.config[name]
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54 assert 'path' in section
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55
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56 # load object
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57 obj = loader.load(section['path'])
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58
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59 # get the object's arguments (if any)
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60 args = section.get('args', None)
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61 kwargs = section.get('kwargs', None)
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62
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63 # if args and kwargs aren't there, you're done!
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64 if args is None and kwargs is None:
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65 self.parsed[name] = obj
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66 return obj
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67
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68 # interpolate arguments
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69 if args:
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70 args = [self.interpolate(arg) for arg in args]
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71 else:
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72 args = []
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73 if kwargs:
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74 kwargs = dict([(key, self.interpolate(value))
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75 for key, value in kwargs.items()])
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76 else:
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77 kwargs = {}
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78
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79 # invoke
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80 self.parsed[name] = obj(*args, **kwargs)
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81 return self.parsed[name]
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83 def interpolate(self, value):
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84
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85 # only interpolate strings
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86 if not isinstance(value, basestring):
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87 return value
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88
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89 if value.startswith(self.delimeters[0]) and value.endswith(self.delimeters[1]):
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90 value = value[len(self.delimeters[0]):-len(self.delimeters[1])]
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91 if value in self.config:
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92 return self.load(value)
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93 return value
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94
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95 class IniFactory(PyFactory):
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96 """load a python object from an .ini file"""
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97
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98 def __init__(self, inifile, main=''):
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99 assert os.path.exists(inifile), "File not found: %s" % inifile
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100 self.inifile = inifile
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101 config = self.read(inifile)
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102 PyFactory.__init__(self, config, main)
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103
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104 @classmethod
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105 def configuration(cls, iniconfig, **defaults):
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106 """interpret configuration from raw .ini syntax"""
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107 config = {}
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108 interpolated = set()
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109 seen = set()
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110 object_string = '%(object)s'
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111
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112 # create a hash of section names
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113 names = {}
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114 for section in iniconfig:
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115
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116 # sanity check
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117 assert ':' in section, "No : in section: %s" % section
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118
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119 name = section.split(':',1)[0]
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120 names[name] = section
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121
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122 def create_section(section, options):
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123
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124 # split up the section identifier
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125 name, path = section.split(':', 1)
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126
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127 # make a dict for the section
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128 sect = {}
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129
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130 # interpret decorators
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131 if ':' in path:
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132 wrapper, _path = path.split(':', 1)
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133 # TODO: could interpolate wrapper
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134 if wrapper in names:
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135
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136 # inline wrapper arguments:
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137 # [extended-fibonacci:@:four=4,five=5:fibonacci]
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138 _wrapper_args = None
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139 _wrapper_kwargs = None
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140 if ':' in _path:
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141 _wrapper_options, __path = _path.split(':', 1)
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142 if ',' in _wrapper_options or '=' in _wrapper_options:
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143 # ,= : tokens to ensure these are wrapper options
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144 # as these shouldn't be found in a real path (dotted path or file path)
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145 _wrapper_args, _wrapper_kwargs = cast.str2args(_wrapper_options)
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146 _path = __path
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147
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148 if _path in names:
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149 # [foo:bar:fleem]
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150 wrapped_name = _path
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151 else:
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152 # stub value for "anonymous" name
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153 # [foo:bar:%(here)s/objects.py:MyClass]
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154 wrapped_name = section
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155
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156 # get wrapper options
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157 if wrapper not in config:
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158 # load wrapper configuration
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159 wrapper_section = names[wrapper]
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160 if wrapper_section in seen:
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161 pass # TODO
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162 create_section(wrapper_section, iniconfig[wrapper_section])
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163 wrapper_options = deepcopy(config[wrapper])
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164
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165 # add inline wrapper args, kwargs
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166 if _wrapper_args is not None:
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167 if 'args' in wrapper_options:
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168 wrapper_options['args'].extend(_wrapper_args)
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169 else:
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170 wrapper_options['args'] = _wrapper_args
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171 if _wrapper_kwargs is not None:
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172 if 'kwargs' in wrapper_options:
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173 wrapper_options['kwargs'].update(_wrapper_kwargs)
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174 else:
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175 wrapper_options['kwargs'] = _wrapper_kwargs
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176
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177 # interpolate wrapper_options
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178 def interpolate(option):
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179 if option == object_string:
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180 return '%(' + wrapped_name + ')s'
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181 return option
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182 if 'args' in wrapper_options:
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183 args = wrapper_options['args'][:]
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184 args = [interpolate(i) for i in args]
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185 wrapper_options['args'] = args
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186 if 'kwargs' in wrapper_options:
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187 kwargs = wrapper_options['kwargs'].copy()
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188 kwargs = dict([(i,interpolate(j)) for i, j in kwargs.items()])
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189 wrapper_options['kwargs'] = kwargs
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190
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191 # create wrapper
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192 config[name] = wrapper_options
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193 if _path == wrapped_name:
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194 return
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195 name = wrapped_name
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196 path = _path
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197
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198 elif path in names:
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199 # override section: [foo:bar]
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200 if path not in config:
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201 # load overridden section
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202 overridden_section = names[path]
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203 if overridden_section in seen:
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204 pass # TODO
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205 create_section(overridden_section, iniconfig[overridden_section])
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206 sect = deepcopy(config[path])
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207
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208 if 'path' not in sect:
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209 # add the path to section dict
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210 path = path % defaults
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211 sect['path'] = path
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212
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213 # get arguments from .ini options
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214 for option, value in options.items():
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215 if option == '.': # positional arguments
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216 sect['args'] = cast.str2list(value)
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217 else: # keyword arguments
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218 sect.setdefault('kwargs', {})[option] = value
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219
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220 # set the configuration
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221 config[name] = sect
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222
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223 # get the object definitions
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224 for section, options in iniconfig.items():
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225 seen.add(section)
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226 if section not in interpolated:
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227 create_section(section, options)
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228 interpolated.add(section)
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229
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230 return config
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231
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232 @classmethod
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233 def read(cls, inifile):
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234 """reads configuration from an .ini file"""
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235
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236 here = os.path.dirname(os.path.abspath(inifile))
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237
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238 # read configuration
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239 defaults={'here': here,
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240 'this': os.path.abspath(inifile)}
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241 parser = ConfigParser(defaults=defaults)
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242 parser.optionxform = str # use whole case
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243 parser.read(inifile)
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244
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245 # parse configuration
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246 config = {}
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247 for section in parser.sections():
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248
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249 config[section] = {}
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250
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251 # read the options
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252 for option in parser.options(section):
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253
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254 if option in parser.defaults():
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255 # don't include the defaults
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256 continue
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257
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258 # try to interpolate the option
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259 # otherwise, use the raw value
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260 try:
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261 value = parser.get(section, option)
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262 except (InterpolationMissingOptionError, InterpolationSyntaxError, InterpolationDepthError):
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263 value = parser.get(section, option, raw=True)
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264
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265 config[section][option] = value
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266
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267 return cls.configuration(config, **parser.defaults())
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268
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269 def main(args=sys.argv[1:]):
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270 """command line entry point"""
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271 usage = '%prog file1.ini -arg1 -arg2 --key1=value1 --key2=value2'
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272 parser = OptionParser(usage=usage, description=IniFactory.__doc__)
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273 options, args = parser.parse_args(args)
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274
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275 if len(args) != 1:
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276 parser.print_usage()
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277 parser.exit()
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278
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279 factory = IniFactory(args[0])
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280 obj = factory.load()
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281 print obj
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282
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283 if __name__ == '__main__':
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284 main()