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annotate pyloader/factory.py @ 23:9b2ca32e7a36

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wire up command line entry point
author Jeff Hammel <jhammel@mozilla.com>
date Mon, 06 Jun 2011 07:46:18 -0700
parents b16d6a204ac1
children ce8fa574324d
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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 optparse import OptionParser
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12 from ConfigParser import InterpolationMissingOptionError
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13 from ConfigParser import InterpolationSyntaxError
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14 from ConfigParser import SafeConfigParser as ConfigParser
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16 __all__ = ['CircularReferenceError', 'PyFactory', 'IniFactory']
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17
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18 class CircularReferenceError(Exception):
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19 """factory has detected a circular reference"""
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20
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21 class PyFactory(object):
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22
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23 delimeters = ('%(', ')s')
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24
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25 def __init__(self, config=None, main=''):
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26 self.main = main # main section
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27 self.configure(config or {})
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28
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29 def configure(self, config):
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30 """load a new configuration"""
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31 # TODO: this should really be a configuration update. If you keep
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32 # track of all "apps" and their parents (i.e. as a ADG)
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33 # you should be able to update only relevent apps
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34 self.config = config
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35 self.seen = set() # already seen apps to note cyclic dependencies
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36 self.parsed = {} # instantiated apps
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37
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38 def load(self, name=None):
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39 """load an object"""
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40
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41 name = name or self.main # load main section by default
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42 assert name in self.config, "'%s' not found in configuration"
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43 if name in self.parsed:
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44 return self.parsed[name]
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45 if name in self.seen:
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46 raise CircularReferenceError('Circular reference! : %s' % name)
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47 self.seen.add(name)
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48
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49 # get section
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50 section = self.config[name]
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51 assert 'path' in section
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52
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53 # load object
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54 obj = loader.load(section['path'])
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55
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56 # get the object's arguments (if any)
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57 args = section.get('args', None)
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58 kwargs = section.get('kwargs', None)
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59
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60 # if args and kwargs aren't there, you're done!
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61 if args is None and kwargs is None:
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62 self.parsed[name] = obj
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63 return obj
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64
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65 # interpolate arguments
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66 if args:
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67 args = [self.interpolate(arg) for arg in args]
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68 else:
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69 args = []
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70 if kwargs:
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71 kwargs = dict([(key, self.interpolate(value))
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72 for key, value in kwargs.items()])
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73 else:
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74 kwargs = {}
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75
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76 # invoke
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77 self.parsed[name] = obj(*args, **kwargs)
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78 return self.parsed[name]
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79
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80 def interpolate(self, value):
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81
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82 # only interpolate strings
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83 if not isinstance(value, basestring):
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84 return value
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85
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86 if value.startswith(self.delimeters[0]) and value.endswith(self.delimeters[1]):
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87 value = value[len(self.delimeters[0]):-len(self.delimeters[1])]
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88 if value in self.config:
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89 return self.load(value)
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90 return value
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91
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92 class IniFactory(PyFactory):
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93
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94 def __init__(self, inifile, main=''):
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95 assert os.path.exists(inifile), "File not found: %s" % inifile
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96 self.inifile = inifile
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97 config = self.read(inifile)
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98 PyFactory.__init__(self, config, main)
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99
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100 @classmethod
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101 def read(cls, inifile):
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102 """reads configuration from an .ini file"""
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103
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104 here = os.path.dirname(os.path.abspath(inifile))
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105
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106 # read configuration
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107 defaults={'here': here,
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108 'this': os.path.abspath(inifile)}
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109 parser = ConfigParser(defaults=defaults)
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110 parser.optionxform = str # use whole case
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111 parser.read(inifile)
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112
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113 # parse configuration
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114 config = {}
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115 for section in parser.sections():
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116
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117 # sanity check
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118 assert ':' in section, "No : in section: %s" % section
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119
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120 # make a dict for the section
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121 name, path = section.split(':', 1)
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122 sect = config[name] = dict(path=path)
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123
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124 # read the options
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125 for option in parser.options(section):
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126
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127 if option in parser.defaults():
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128 # don't include the defaults
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129 continue
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130
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131 # try to interpolate the option
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132 # otherwise, use the raw value
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133 try:
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134 value = parser.get(section, option)
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135 except (InterpolationMissingOptionError, InterpolationSyntaxError):
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136 value = parser.get(section, option, raw=True)
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137
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138 if option = '.': # positional arguments
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139 sect['args'] = cast.str2list(value)
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140 else:
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141 sect.setdefault('kwargs', {})[option] = value
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142
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143 return config
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144
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145 def main(args=sys.argv[1:]):
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146 """command line entry point"""
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147 parser = OptionParser()
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148 options, args = parser.parse_args(args)
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149
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150 if len(args) != 1:
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151 parser.print_usage()
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152 parser.exit()
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153
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154 factory = IniFactory(args[0])
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155 print factory.load()
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156
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157 if __name__ == '__main__':
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158 main()