Mercurial > piecrust2

annotate piecrust/data/pagedata.py @ 904:cc2647360036

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internal: Remove unnecessary timer, add timer for lazy data building.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 23 Jul 2017 08:25:45 -0700
parents d6d35b2efd04
children 45ad976712ec
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1 import time
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2 import logging
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3 import collections.abc
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4 from piecrust.sources.base import AbortedSourceUseError
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5
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6
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7 logger = logging.getLogger(__name__)
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8
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9
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10 class LazyPageConfigLoaderHasNoValue(Exception):
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11 """ An exception that can be returned when a loader for `LazyPageConfig`
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12 can't return any value.
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13 """
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14 pass
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15
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16
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17 class LazyPageConfigData(collections.abc.Mapping):
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18 """ An object that represents the configuration header of a page,
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19 but also allows for additional data. It's meant to be exposed
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20 to the templating system.
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21 """
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22 debug_render = []
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23 debug_render_invoke = []
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24 debug_render_dynamic = ['_debugRenderKeys']
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25 debug_render_invoke_dynamic = ['_debugRenderKeys']
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26
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27 def __init__(self, page):
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28 self._page = page
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29 self._values = {}
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30 self._loaders = {}
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31 self._is_loaded = False
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32
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33 def __getattr__(self, name):
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34 try:
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35 return self._getValue(name)
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36 except LazyPageConfigLoaderHasNoValue as ex:
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37 raise AttributeError("No such attribute: %s" % name) from ex
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38
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39 def __getitem__(self, name):
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40 try:
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41 return self._getValue(name)
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42 except LazyPageConfigLoaderHasNoValue as ex:
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43 raise KeyError("No such key: %s" % name) from ex
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44
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45 def __iter__(self):
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46 keys = set(self._page.config.keys())
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47 keys |= set(self._values.keys())
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48 keys |= set(self._loaders.keys())
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49 keys.discard('*')
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50 return iter(keys)
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51
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52 def __len__(self):
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53 return len(self._page.config) + len(self._values) + len(self._loaders)
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54
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55 def _getValue(self, name):
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56 # First try the page configuration itself.
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57 try:
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58 return self._page.config[name]
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59 except KeyError:
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60 pass
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61
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62 # Then try loaded values.
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63 self._ensureLoaded()
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64 try:
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65 return self._values[name]
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66 except KeyError:
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67 pass
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68
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69 # Try a loader for a new value.
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70 loader = self._loaders.get(name)
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71 if loader is not None:
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72 try:
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73 with self._page.app.env.stats.timerScope('BuildLazyPageData'):
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74 self._values[name] = loader(self, name)
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75 except (LazyPageConfigLoaderHasNoValue, AbortedSourceUseError):
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76 raise
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77 except Exception as ex:
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78 logger.exception(ex)
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79 raise Exception(
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80 "Error while loading attribute '%s' for: %s" %
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81 (name, self._page.content_spec)) from ex
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82
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83 # Forget this loader now that it served its purpose.
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84 try:
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85 del self._loaders[name]
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86 except KeyError:
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87 pass
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88 return self._values[name]
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89
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90 # Try the wildcard loader if it exists.
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91 loader = self._loaders.get('*')
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92 if loader is not None:
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93 try:
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94 with self._page.app.env.stats.timerScope('BuildLazyPageData'):
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95 self._values[name] = loader(self, name)
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96 except (LazyPageConfigLoaderHasNoValue, AbortedSourceUseError):
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97 raise
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98 except Exception as ex:
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99 logger.exception(ex)
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100 raise Exception(
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101 "Error while loading attribute '%s' for: %s" %
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102 (name, self._page.content_spec)) from ex
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103 # We always keep the wildcard loader in the loaders list.
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104 try:
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105 return self._values[name]
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106 except KeyError:
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107 pass
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108
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109 raise LazyPageConfigLoaderHasNoValue()
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110
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111 def _setValue(self, name, value):
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112 self._values[name] = value
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113
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114 def _unmapLoader(self, attr_name):
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115 try:
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116 del self._loaders[attr_name]
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117 except KeyError:
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118 pass
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119
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120 def _mapLoader(self, attr_name, loader, override_existing=False):
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121 assert loader is not None
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122
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123 if not override_existing and attr_name in self._loaders:
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124 raise Exception(
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125 "A loader has already been mapped for: %s" % attr_name)
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126 self._loaders[attr_name] = loader
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127
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128 def _mapValue(self, attr_name, value, override_existing=False):
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129 self._mapLoader(
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130 attr_name,
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131 lambda _, __: value,
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132 override_existing=override_existing)
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133
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134 def _ensureLoaded(self):
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135 if self._is_loaded:
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136 return
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137
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138 self._is_loaded = True
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139 try:
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140 with self._page.app.env.stats.timerScope('BuildLazyPageData'):
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141 self._load()
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142 except Exception as ex:
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143 logger.exception(ex)
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144 raise Exception(
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145 "Error while loading data for: %s" %
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146 self._page.content_spec) from ex
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147
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148 def _load(self):
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149 pass
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150
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151 def _debugRenderKeys(self):
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152 self._ensureLoaded()
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153 keys = set(self._values.keys())
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154 if self._loaders:
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155 keys |= set(self._loaders.keys())
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156 keys.discard('*')
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157 return list(keys)
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158
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159
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160 class PageData(LazyPageConfigData):
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161 """ Template data for a page.
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162 """
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163 def __init__(self, page, ctx):
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164 super().__init__(page)
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165 self._ctx = ctx
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166
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167 def _load(self):
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168 page = self._page
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169 set_val = self._setValue
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170
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171 dt = page.datetime
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172 for k, v in page.source_metadata.items():
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173 set_val(k, v)
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174 set_val('url', page.getUri(self._ctx.sub_num))
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175 set_val('timestamp', time.mktime(dt.timetuple()))
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176 set_val('datetime', {
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177 'year': dt.year, 'month': dt.month, 'day': dt.day,
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178 'hour': dt.hour, 'minute': dt.minute, 'second': dt.second})
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179
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180 self._mapLoader('date', _load_date)
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181
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182
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183 def _load_date(data, name):
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184 page = data._page
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185 date_format = page.app.config.get('site/date_format')
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186 if date_format:
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187 return page.datetime.strftime(date_format)
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188 return None