Mercurial > hg > pyloader
annotate pyloader/factory.py @ 29:000e175169c2
use IniFactory.__doc__ as parser description
author | Jeff Hammel <jhammel@mozilla.com> |
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date | Mon, 06 Jun 2011 11:18:31 -0700 |
parents | 4b757f73e8ca |
children | 850d31be0fb8 |
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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 |
26 | 12 from ConfigParser import InterpolationDepthError |
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13 from ConfigParser import InterpolationMissingOptionError |
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14 from ConfigParser import InterpolationSyntaxError |
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15 from ConfigParser import SafeConfigParser as ConfigParser |
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16 |
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17 __all__ = ['CircularReferenceError', 'PyFactory', 'IniFactory'] |
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18 |
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19 class CircularReferenceError(Exception): |
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20 """factory has detected a circular reference""" |
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21 |
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22 class PyFactory(object): |
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23 |
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24 delimeters = ('%(', ')s') |
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25 |
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26 def __init__(self, config=None, main=''): |
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27 self.main = main # main section |
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28 self.configure(config or {}) |
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29 |
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30 def configure(self, config): |
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31 """load a new configuration""" |
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32 # TODO: this should really be a configuration update. If you keep |
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33 # track of all "apps" and their parents (i.e. as a ADG) |
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34 # you should be able to update only relevent apps |
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35 self.config = config |
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36 self.seen = set() # already seen apps to note cyclic dependencies |
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37 self.parsed = {} # instantiated apps |
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38 |
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39 def load(self, name=None): |
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40 """load an object""" |
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41 |
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42 name = name or self.main # load main section by default |
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43 assert name in self.config, "'%s' not found in configuration" |
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44 if name in self.parsed: |
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45 return self.parsed[name] |
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46 if name in self.seen: |
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47 raise CircularReferenceError('Circular reference! : %s' % name) |
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48 self.seen.add(name) |
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49 |
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50 # get section |
11 | 51 section = self.config[name] |
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52 assert 'path' in section |
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53 |
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54 # load object |
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55 obj = loader.load(section['path']) |
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56 |
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57 # get the object's arguments (if any) |
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58 args = section.get('args', None) |
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59 kwargs = section.get('kwargs', None) |
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60 |
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61 # if args and kwargs aren't there, you're done! |
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62 if args is None and kwargs is None: |
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63 self.parsed[name] = obj |
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64 return obj |
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65 |
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66 # interpolate arguments |
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67 if args: |
11 | 68 args = [self.interpolate(arg) for arg in args] |
69 else: | |
70 args = [] | |
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71 if kwargs: |
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72 kwargs = dict([(key, self.interpolate(value)) |
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73 for key, value in kwargs.items()]) |
11 | 74 else: |
75 kwargs = {} | |
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76 |
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77 # invoke |
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78 self.parsed[name] = obj(*args, **kwargs) |
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79 return self.parsed[name] |
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80 |
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81 def interpolate(self, value): |
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82 |
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83 # only interpolate strings |
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84 if not isinstance(value, basestring): |
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85 return value |
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86 |
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87 if value.startswith(self.delimeters[0]) and value.endswith(self.delimeters[1]): |
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88 value = value[len(self.delimeters[0]):-len(self.delimeters[1])] |
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89 if value in self.config: |
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90 return self.load(value) |
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91 return value |
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92 |
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93 class IniFactory(PyFactory): |
27 | 94 """load a python object from an .ini file""" |
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95 |
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96 def __init__(self, inifile, main=''): |
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97 assert os.path.exists(inifile), "File not found: %s" % inifile |
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98 self.inifile = inifile |
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99 config = self.read(inifile) |
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100 PyFactory.__init__(self, config, main) |
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101 |
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102 @classmethod |
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103 def read(cls, inifile): |
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104 """reads configuration from an .ini file""" |
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105 |
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106 here = os.path.dirname(os.path.abspath(inifile)) |
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107 |
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108 # read configuration |
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109 defaults={'here': here, |
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110 'this': os.path.abspath(inifile)} |
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111 parser = ConfigParser(defaults=defaults) |
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112 parser.optionxform = str # use whole case |
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113 parser.read(inifile) |
18 | 114 |
115 # parse configuration | |
116 config = {} | |
117 for section in parser.sections(): | |
118 | |
119 # sanity check | |
120 assert ':' in section, "No : in section: %s" % section | |
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121 |
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122 # make a dict for the section |
18 | 123 name, path = section.split(':', 1) |
26 | 124 path = path % parser.defaults() |
18 | 125 sect = config[name] = dict(path=path) |
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126 |
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127 # read the options |
18 | 128 for option in parser.options(section): |
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129 |
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130 if option in parser.defaults(): |
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131 # don't include the defaults |
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132 continue |
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133 |
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134 # try to interpolate the option |
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135 # otherwise, use the raw value |
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136 try: |
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137 value = parser.get(section, option) |
26 | 138 except (InterpolationMissingOptionError, InterpolationSyntaxError, InterpolationDepthError): |
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139 value = parser.get(section, option, raw=True) |
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140 |
24 | 141 if option == '.': # positional arguments |
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142 sect['args'] = cast.str2list(value) |
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143 else: |
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144 sect.setdefault('kwargs', {})[option] = value |
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145 |
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146 return config |
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147 |
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148 def main(args=sys.argv[1:]): |
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149 """command line entry point""" |
26 | 150 usage = '%prog file1.ini -arg1 -arg2 --key1=value1 --key2=value2' |
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151 parser = OptionParser(usage=usage, description=IniFactory.__doc__) |
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152 options, args = parser.parse_args(args) |
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153 |
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154 if len(args) != 1: |
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155 parser.print_usage() |
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156 parser.exit() |
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157 |
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158 factory = IniFactory(args[0]) |
26 | 159 obj = factory.load() |
160 print obj | |
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161 |
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162 if __name__ == '__main__': |
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163 main() |