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annotate piecrust/sources/base.py @ 440:32c7c2d219d2

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performance: Refactor how data is managed to reduce copying. * Make use of `collections.abc.Mapping` to better identify things that are supposed to look like dictionaries. * Instead of handling "overlay" of data in a dict tree in each different data object, make all objects `Mapping`s and handle merging at a higher level with the new `MergedMapping` object. * Since this new object is read-only, remove the need for deep-copying of app and page configurations. * Split data classes into separate modules.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 28 Jun 2015 08:22:39 -0700
parents e7b865f8f335
children daf8df5ade7d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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diff changeset
1 import copy
3
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2 import logging
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3 from werkzeug.utils import cached_property
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4 from piecrust.configuration import ConfigurationError
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5 from piecrust.page import Page
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6
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7
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8 REALM_USER = 0
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9 REALM_THEME = 1
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10 REALM_NAMES = {
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11 REALM_USER: 'User',
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12 REALM_THEME: 'Theme'}
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13
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14
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15 MODE_PARSING = 0
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16 MODE_CREATING = 1
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17
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18
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19 logger = logging.getLogger(__name__)
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20
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21
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22 def build_pages(app, factories):
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23 for f in factories:
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24 yield f.buildPage()
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26
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27 class InvalidFileSystemEndpointError(Exception):
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28 def __init__(self, source_name, fs_endpoint):
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29 super(InvalidFileSystemEndpointError, self).__init__(
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30 "Invalid file-system endpoint for source '%s': %s" %
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31 (source_name, fs_endpoint))
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32
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33
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34 class PageFactory(object):
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35 """ A class responsible for creating a page.
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36 """
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37 def __init__(self, source, rel_path, metadata):
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38 self.source = source
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39 self.rel_path = rel_path
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40 self.metadata = metadata
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41
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42 @cached_property
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43 def ref_spec(self):
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44 return '%s:%s' % (self.source.name, self.rel_path)
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45
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46 @cached_property
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47 def path(self):
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48 path, _ = self.source.resolveRef(self.rel_path)
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49 return path
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50
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51 def buildPage(self):
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52 repo = self.source.app.env.page_repository
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53 if repo is not None:
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54 cache_key = '%s:%s' % (self.source.name, self.rel_path)
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55 return repo.get(cache_key, self._doBuildPage)
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56 return self._doBuildPage()
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57
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58 def _doBuildPage(self):
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59 logger.debug("Building page: %s" % self.path)
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60 page = Page(self.source, copy.deepcopy(self.metadata), self.rel_path)
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61 return page
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62
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63
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64 class PageSource(object):
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65 """ A source for pages, e.g. a directory with one file per page.
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66 """
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67 def __init__(self, app, name, config):
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68 self.app = app
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69 self.name = name
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70 self.config = config or {}
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71 self.config.setdefault('realm', REALM_USER)
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72 self._factories = None
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73 self._provider_type = None
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74
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75 def __getattr__(self, name):
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76 try:
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77 return self.config[name]
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78 except KeyError:
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79 raise AttributeError()
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80
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81 @property
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82 def is_theme_source(self):
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83 return self.realm == REALM_THEME
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84
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85 @property
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86 def root_dir(self):
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87 if self.is_theme_source:
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88 return self.app.theme_dir
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89 return self.app.root_dir
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90
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91 def getPages(self):
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92 return build_pages(self.app, self.getPageFactories())
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93
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94 def getPage(self, metadata):
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95 factory = self.findPageFactory(metadata, MODE_PARSING)
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96 if factory is None:
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97 return None
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98 return factory.buildPage()
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99
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100 def getPageFactories(self):
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101 if self._factories is None:
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102 self._factories = list(self.buildPageFactories())
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103 return self._factories
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104
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105 def buildPageFactories(self):
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106 raise NotImplementedError()
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107
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108 def resolveRef(self, ref_path):
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109 """ Returns the full path and source metadata given a source
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110 (relative) path, like a ref-spec.
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111 """
3
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112 raise NotImplementedError()
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113
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114 def findPageFactory(self, metadata, mode):
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115 raise NotImplementedError()
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116
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117 def buildDataProvider(self, page, override):
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118 if self._provider_type is None:
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119 cls = next((pt for pt in self.app.plugin_loader.getDataProviders()
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120 if pt.PROVIDER_NAME == self.data_type),
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121 None)
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122 if cls is None:
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123 raise ConfigurationError(
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124 "Unknown data provider type: %s" % self.data_type)
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125 self._provider_type = cls
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126
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127 return self._provider_type(self, page, override)
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128
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129 def getTaxonomyPageRef(self, tax_name):
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130 tax_pages = self.config.get('taxonomy_pages')
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131 if tax_pages is None:
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
132 return None
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
133 return tax_pages.get(tax_name)
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
134