Mercurial > hg > pyloader
annotate pyloader/factory.py @ 62:97800b02f636
shouldnt need to go through the whole sequence when youre wrapping a known section
author | Jeff Hammel <jhammel@mozilla.com> |
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date | Thu, 09 Jun 2011 09:11:47 -0700 |
parents | cc361ad8a692 |
children | 995b831041be |
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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 configuration(cls, iniconfig, **defaults): |
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104 """interpret configuration from raw .ini syntax""" |
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105 config = {} |
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106 interpolated = set() |
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107 seen = set() |
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108 object_string = '%(object)s' |
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109 |
44 | 110 # create a hash of section names |
111 names = {} | |
112 for section in iniconfig: | |
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113 |
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114 # sanity check |
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115 assert ':' in section, "No : in section: %s" % section |
45 | 116 |
117 name = section.split(':',1)[0] | |
118 names[name] = section | |
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119 |
44 | 120 def create_section(section, options): |
121 | |
122 # split up the section identifier | |
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123 name, path = section.split(':', 1) |
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124 |
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125 # interpret decorators |
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126 if ':' in path: |
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127 wrapper, _path = path.split(':', 1) |
47 | 128 # TODO: could interpolate wrapper |
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129 if wrapper in names: |
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130 |
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131 # TODO: wrapper arguments: |
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132 # [extended-fibonacci:@:four=4,five=5:fibonacci] |
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133 |
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134 # TODO: will be correct for |
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135 # [foo:bar:%(here)s/objects.py:MyClass] |
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136 # but not for |
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137 # [foo:bar:fleem] |
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138 # in the latter case, just use fleem |
51 | 139 # but check for cyclic consistency |
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140 if _path in names: |
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141 wrapped_name = _path |
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142 else: |
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143 wrapped_name = section |
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144 |
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145 if wrapper not in config: |
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146 wrapper_section = names[wrapper] |
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147 if wrapper_section in seen: |
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148 pass # TODO |
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149 create_section(wrapper_section, iniconfig[wrapper_section]) |
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150 wrapper_options = config[wrapper].copy() |
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151 |
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152 # TODO interpolate wrapper_options |
51 | 153 def interpolate(option): |
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154 if option == object_string: |
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155 return '%(' + wrapped_name + ')s' |
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156 return option |
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157 if 'args' in wrapper_options: |
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158 args = wrapper_options['args'][:] |
51 | 159 args = [interpolate(i) for i in args] |
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160 wrapper_options['args'] = args |
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161 if 'kwargs' in wrapper_options: |
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162 kwargs = wrapper_options['kwargs'].copy() |
51 | 163 kwargs = dict([(i,interpolate(j)) for i, j in kwargs.items()]) |
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164 wrapper_options['kwargs'] = kwargs |
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165 |
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166 # create wrapper |
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167 config[name] = wrapper_options |
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168 if _path == wrapped_name: |
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169 return |
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170 name = wrapped_name |
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171 path = _path |
44 | 172 |
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173 |
44 | 174 # make a dict for the section |
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175 path = path % defaults |
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176 sect = config[name] = dict(path=path) |
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177 |
44 | 178 # get arguments from .ini options |
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179 for option, value in options.items(): |
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180 |
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181 if option == '.': # positional arguments |
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182 sect['args'] = cast.str2list(value) |
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183 else: |
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184 sect.setdefault('kwargs', {})[option] = value |
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185 |
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186 |
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187 for section, options in iniconfig.items(): |
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188 seen.add(section) |
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189 if section not in interpolated: |
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190 create_section(section, options) |
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191 interpolated.add(section) |
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192 |
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193 return config |
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194 |
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195 @classmethod |
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196 def read(cls, inifile): |
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197 """reads configuration from an .ini file""" |
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198 |
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199 here = os.path.dirname(os.path.abspath(inifile)) |
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200 |
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201 # read configuration |
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202 defaults={'here': here, |
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203 'this': os.path.abspath(inifile)} |
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204 parser = ConfigParser(defaults=defaults) |
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205 parser.optionxform = str # use whole case |
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206 parser.read(inifile) |
18 | 207 |
208 # parse configuration | |
209 config = {} | |
210 for section in parser.sections(): | |
211 | |
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212 config[section] = {} |
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213 |
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214 # read the options |
18 | 215 for option in parser.options(section): |
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216 |
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217 if option in parser.defaults(): |
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218 # don't include the defaults |
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219 continue |
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220 |
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221 # try to interpolate the option |
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222 # otherwise, use the raw value |
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223 try: |
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224 value = parser.get(section, option) |
26 | 225 except (InterpolationMissingOptionError, InterpolationSyntaxError, InterpolationDepthError): |
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226 value = parser.get(section, option, raw=True) |
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227 |
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228 config[section][option] = value |
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229 |
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230 return cls.configuration(config, **parser.defaults()) |
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231 |
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232 def main(args=sys.argv[1:]): |
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233 """command line entry point""" |
26 | 234 usage = '%prog file1.ini -arg1 -arg2 --key1=value1 --key2=value2' |
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235 parser = OptionParser(usage=usage, description=IniFactory.__doc__) |
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236 options, args = parser.parse_args(args) |
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237 |
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238 if len(args) != 1: |
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239 parser.print_usage() |
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240 parser.exit() |
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241 |
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242 factory = IniFactory(args[0]) |
26 | 243 obj = factory.load() |
244 print obj | |
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245 |
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246 if __name__ == '__main__': |
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247 main() |