Mercurial > hg > pyloader
annotate pyloader/factory.py @ 20:057ccfe310b2
finish basic form of .ini factory - that was easy
author | Jeff Hammel <jhammel@mozilla.com> |
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date | Mon, 06 Jun 2011 07:33:37 -0700 |
parents | 8987867698ee |
children | 4f7c05630f36 |
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1 """ |
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2 abstract factories |
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3 """ |
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4 |
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5 import cast |
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6 import loader |
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7 import os |
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8 from ConfigParser import InterpolationMissingOptionError |
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9 from ConfigParser import InterpolationSyntaxError |
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10 from ConfigParser import SafeConfigParser as ConfigParser |
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11 |
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12 __all__ = ['CircularReferenceError', 'PyFactory', 'IniFactory'] |
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13 |
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14 class CircularReferenceError(Exception): |
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15 """factory has detected a circular reference""" |
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16 |
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17 class PyFactory(object): |
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18 |
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19 delimeters = ('%(', ')s') |
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20 |
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21 def __init__(self, config=None, main=''): |
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22 self.main = main # main section |
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23 self.configure(config or {}) |
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24 |
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25 def configure(self, config): |
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26 """load a new configuration""" |
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27 # TODO: this should really be a configuration update. If you keep |
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28 # track of all "apps" and their parents (i.e. as a ADG) |
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29 # you should be able to update only relevent apps |
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30 self.config = config |
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31 self.seen = set() # already seen apps to note cyclic dependencies |
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32 self.parsed = {} # instantiated apps |
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33 |
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34 def load(self, name=None): |
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35 """load an object""" |
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36 |
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37 name = name or self.main # load main section by default |
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38 assert name in self.config, "'%s' not found in configuration" |
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39 if name in self.parsed: |
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40 return self.parsed[name] |
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41 if name in self.seen: |
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42 raise CircularReferenceError('Circular reference! : %s' % name) |
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43 self.seen.add(name) |
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44 |
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45 # get section |
11 | 46 section = self.config[name] |
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47 assert 'path' in section |
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48 |
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49 # load object |
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50 obj = loader.load(section['path']) |
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51 |
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52 # get the object's arguments (if any) |
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53 args = section.get('args', None) |
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54 kwargs = section.get('kwargs', None) |
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55 |
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56 # if args and kwargs aren't there, you're done! |
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57 if args is None and kwargs is None: |
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58 self.parsed[name] = obj |
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59 return obj |
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60 |
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61 # interpolate arguments |
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62 if args: |
11 | 63 args = [self.interpolate(arg) for arg in args] |
64 else: | |
65 args = [] | |
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66 if kwargs: |
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67 kwargs = dict([(key, self.interpolate(value)) |
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68 for key, value in kwargs.items()]) |
11 | 69 else: |
70 kwargs = {} | |
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71 |
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72 # invoke |
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73 self.parsed[name] = obj(*args, **kwargs) |
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74 return self.parsed[name] |
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75 |
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76 def interpolate(self, value): |
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77 |
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78 # only interpolate strings |
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79 if not isinstance(value, basestring): |
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80 return value |
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81 |
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82 if value.startswith(self.delimeters[0]) and value.endswith(self.delimeters[1]): |
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83 value = value[len(self.delimeters[0]):-len(self.delimeters[1])] |
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84 if value in self.config: |
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85 return self.load(value) |
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86 return value |
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87 |
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88 class IniFactory(PyFactory): |
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89 |
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90 def __init__(self, inifile, main=''): |
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91 assert os.path.exists(inifile), "File not found: %s" % inifile |
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92 |
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93 def read(self): |
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94 """reads configuration from an .ini file""" |
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95 |
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96 here = os.path.dirname(os.path.abspath(self.inifile)) |
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97 |
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98 # read configuration |
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99 defaults={'here': here, |
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100 'this': os.path.abspath(self.inifile)} |
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101 parser = ConfigParser(defaults=defaults) |
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102 parser.optionxform = str # use whole case |
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103 parser.read(self.inifile) |
18 | 104 |
105 # parse configuration | |
106 config = {} | |
107 for section in parser.sections(): | |
108 | |
109 # sanity check | |
110 assert ':' in section, "No : in section: %s" % section | |
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111 |
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112 # make a dict for the section |
18 | 113 name, path = section.split(':', 1) |
114 sect = config[name] = dict(path=path) | |
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115 |
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116 # read the options |
18 | 117 for option in parser.options(section): |
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118 |
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119 if option in parser.defaults(): |
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120 # don't include the defaults |
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121 continue |
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122 |
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123 # try to interpolate the option |
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124 # otherwise, use the raw value |
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125 try: |
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126 value = parser.get(section, option) |
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127 except (InterpolationMissingOptionError, InterpolationSyntaxError): |
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128 value = parser.get(section, option, raw=True) |
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129 |
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130 if option = '.': # positional arguments |
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131 sect['args'] = cast.str2list(value) |
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132 else: |
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133 sect.setdefault('kwargs', {})[option] = value |
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134 |