Mercurial > piecrust2

annotate piecrust/data/base.py @ 3:f485ba500df3

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Gigantic change to basically make PieCrust 2 vaguely functional. - Serving works, with debug window. - Baking works, multi-threading, with dependency handling. - Various things not implemented yet.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 10 Aug 2014 23:43:16 -0700
parents
children 474c9882decf
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rev   line source
3
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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1 import time
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2 import logging
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3 from piecrust.data.assetor import Assetor
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4
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5
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6 logger = logging.getLogger(__name__)
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7
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8
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9 class LazyPageConfigData(object):
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10 """ An object that represents the configuration header of a page,
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11 but also allows for additional data. It's meant to be exposed
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12 to the templating system.
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13 """
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14 def __init__(self, page):
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15 self._page = page
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16 self._values = None
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17 self._loaders = None
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18
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19 @property
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20 def page(self):
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21 return self._page
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22
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23 def __getitem__(self, name):
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24 self._load()
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25
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26 if self._loaders:
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27 loader = self._loaders.get(name)
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28 if loader is not None:
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29 try:
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30 self._values[name] = loader(self, name)
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31 except Exception as ex:
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32 logger.error("Error while loading attribute '%s' for: %s"
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33 % (name, self._page.path))
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34 logger.exception(ex)
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35 raise Exception("Internal Error: %s" % ex)
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36
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37 # We need to double-check `_loaders` here because
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38 # the loader could have removed all loaders, which
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39 # would set this back to `None`.
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40 if self._loaders is not None:
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41 del self._loaders[name]
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42 if len(self._loaders) == 0:
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43 self._loaders = None
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44
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45 return self._values[name]
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46
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47 def setValue(self, name, value):
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48 self._values[name] = value
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49
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50 def mapLoader(self, attr_name, loader):
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51 if loader is None:
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52 if self._loaders is None or attr_name not in self._loaders:
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53 return
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54 del self._loaders[attr_name]
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55 if len(self._loaders) == 0:
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56 self._loaders = None
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57 return
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58
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59 if self._loaders is None:
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60 self._loaders = {}
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61 if attr_name in self._loaders:
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62 raise Exception("A loader has already been mapped for: %s" %
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63 attr_name)
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64 self._loaders[attr_name] = loader
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65
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66 def _load(self):
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67 if self._values is not None:
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68 return
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69 self._values = dict(self._page.config.get())
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70 try:
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71 self._loadCustom()
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72 except Exception as ex:
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73 logger.error("Error while loading data for: %s" % self._page.path)
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74 logger.exception(ex)
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75 raise Exception("Internal Error: %s" % ex)
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76
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77 def _loadCustom(self):
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78 pass
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79
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80
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81 def build_uri(page):
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82 route = page.app.getRoute(page.source.name, page.source_metadata)
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83 if route is None:
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84 raise Exception("Can't get route for page: %s" % page.path)
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85 return route.getUri(page.source_metadata)
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86
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87
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88 def load_rendered_segment(data, name):
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89 from piecrust.rendering import PageRenderingContext, render_page_segments
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90
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91 uri = build_uri(data.page)
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92 try:
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93 ctx = PageRenderingContext(data.page, uri)
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94 segs = render_page_segments(ctx)
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95 except Exception as e:
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96 logger.exception("Error rendering segments for '%s': %s" % (uri, e))
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97 raise
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98
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99 for k, v in segs.iteritems():
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100 data.mapLoader(k, None)
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101 data.setValue(k, v)
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102
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103 if 'content.abstract' in segs:
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104 data.setValue('content', segs['content.abstract'])
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105 data.setValue('has_more', True)
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106 if name == 'content':
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107 return segs['content.abstract']
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108
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109 return segs[name]
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110
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111
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112 class PaginationData(LazyPageConfigData):
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113 def __init__(self, page):
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114 super(PaginationData, self).__init__(page)
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115
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116 def _loadCustom(self):
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117 page_url = build_uri(self.page)
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118 self.setValue('url', page_url)
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119 self.setValue('slug', page_url)
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120 self.setValue('timestamp',
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121 time.mktime(self.page.datetime.timetuple()))
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122 date_format = self.page.app.config.get('site/date_format')
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123 if date_format:
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124 self.setValue('date', self.page.datetime.strftime(date_format))
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125
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126 assetor = Assetor(self.page, page_url)
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127 self.setValue('assets', assetor)
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128
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129 segment_names = self.page.config.get('segments')
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130 for name in segment_names:
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131 self.mapLoader(name, load_rendered_segment)
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132