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annotate piecrust/data/paginator.py @ 1188:a7c43131d871

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bake: Fix file write flushing problem with Python 3.8+ Writing the cache files fails in Python 3.8 because it looks like flushing behaviour has changed. We need to explicitly flush. And even then, in very rare occurrences, it looks like it can still run into racing conditions, so we do a very hacky and ugly "retry" loop when fetching cached data :(
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 15 Jun 2021 22:36:23 -0700
parents 1c324407bd1f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3
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1 import math
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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.sources.base import ContentSource
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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 Paginator(object):
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11 debug_render = [
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12 'has_more', 'items', 'has_items', 'items_per_page',
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13 'items_this_page', 'prev_page_number', 'this_page_number',
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14 'next_page_number', 'prev_page', 'next_page',
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15 'total_item_count', 'total_page_count',
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16 'next_item', 'prev_item']
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17 debug_render_invoke = [
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18 'has_more', 'items', 'has_items', 'items_per_page',
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19 'items_this_page', 'prev_page_number', 'this_page_number',
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20 'next_page_number', 'prev_page', 'next_page',
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21 'total_item_count', 'total_page_count',
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22 'next_item', 'prev_item']
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23
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24 def __init__(self, source, current_page, sub_num, *,
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25 pgn_filter=None, items_per_page=-1):
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26 self._source = source
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27 self._page = current_page
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28 self._sub_num = sub_num
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29 self._iterator = None
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30 self._pgn_filter = pgn_filter
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31 self._items_per_page = items_per_page
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32 self._pgn_set_on_ctx = False
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33 self._is_content_source = isinstance(source, ContentSource)
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34
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35 @property
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36 def is_loaded(self):
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37 return self._iterator is not None
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38
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39 @property
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40 def has_more(self):
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41 return self.next_page_number is not None
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42
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43 @property
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44 def unload(self):
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45 self._iterator = None
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46
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47 # Backward compatibility with PieCrust 1.0 {{{
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48 @property
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49 def posts(self):
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50 return self.items
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51
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52 @property
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53 def has_posts(self):
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54 return self.has_items
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55
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56 @property
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57 def posts_per_page(self):
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58 return self.items_per_page
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59
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60 @property
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61 def posts_this_page(self):
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62 return self.items_this_page
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63
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64 @property
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65 def total_post_count(self):
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66 return self.total_item_count
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67
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68 @property
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69 def next_post(self):
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70 return self.next_item
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71
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72 @property
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73 def prev_post(self):
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74 return self.prev_item
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75 # }}}
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76
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77 @property
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78 def items(self):
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79 self._load()
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80 return self._iterator
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81
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82 @property
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83 def has_items(self):
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84 return self.items_this_page > 0
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85
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86 @cached_property
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87 def items_per_page(self):
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88 if self._items_per_page > 0:
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89 return self._items_per_page
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90
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91 if self._page is not None:
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92 ipp = self._page.config.get('items_per_page')
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93 if ipp is not None:
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94 return ipp
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95
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96 if self._is_content_source:
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97 ipp = self._source.config.get('items_per_page')
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98 if ipp is not None:
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99 return ipp
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100
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101 raise Exception("No way to figure out how many items to display "
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102 "per page.")
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103
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104 @property
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105 def items_this_page(self):
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106 self._load()
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107 return len(self._iterator)
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108
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109 @property
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110 def prev_page_number(self):
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111 if self._sub_num > 1:
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112 return self._sub_num - 1
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113 return None
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114
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115 @property
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116 def this_page_number(self):
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117 return self._sub_num
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118
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119 @property
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120 def next_page_number(self):
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121 self._load()
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122 if self._iterator._has_more:
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123 return self._sub_num + 1
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124 return None
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125
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126 @property
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127 def prev_page(self):
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128 num = self.prev_page_number
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129 if num is not None:
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130 return self._getPageUri(num)
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131 return None
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132
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133 @property
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134 def this_page(self):
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135 return self._getPageUri(self._sub_num)
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136
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137 @property
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138 def next_page(self):
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139 num = self.next_page_number
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140 if num is not None:
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141 return self._getPageUri(num)
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142 return None
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143
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144 @property
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145 def total_item_count(self):
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146 self._load()
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147 return self._iterator.total_count
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148
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149 @property
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150 def total_page_count(self):
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151 total_count = self.total_item_count
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152 per_page = self.items_per_page
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153 return int(math.ceil(total_count / per_page))
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154
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155 @property
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156 def next_item(self):
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157 self._load()
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158 return self._iterator.prev_page
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159
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160 @property
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161 def prev_item(self):
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162 self._load()
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163 return self._iterator.next_page
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164
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165 def all_page_numbers(self, radius=-1):
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166 total_page_count = self.total_page_count
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167 if total_page_count == 0:
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168 return []
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169
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170 if radius <= 0 or total_page_count < (2 * radius + 1):
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171 return list(range(1, total_page_count + 1))
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172
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173 first_num = self._sub_num - radius
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174 last_num = self._sub_num + radius
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175 if first_num <= 0:
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176 last_num += 1 - first_num
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177 first_num = 1
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178 elif last_num > total_page_count:
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179 first_num -= (last_num - total_page_count)
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180 last_num = total_page_count
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181 first_num = max(1, first_num)
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182 last_num = min(total_page_count, last_num)
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183 return list(range(first_num, last_num + 1))
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184
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185 def page(self, index):
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186 return self._getPageUri(index)
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187
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188 def _load(self):
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189 if self._iterator is not None:
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190 return
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191
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192 from piecrust.data.filters import PaginationFilter
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193 from piecrust.dataproviders.pageiterator import (
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194 PageIterator, HardCodedFilterIterator)
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195
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196 self._iterator = PageIterator(
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197 self._source,
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198 current_page=self._page)
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199
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200 if self._pgn_filter is not None:
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201 pag_fil = PaginationFilter()
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202 pag_fil.addClause(self._pgn_filter.root_clause)
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203 self._iterator._simpleNonSortedWrap(
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204 HardCodedFilterIterator, pag_fil)
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205
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206 offset = (self._sub_num - 1) * self.items_per_page
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207 limit = self.items_per_page
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208 self._iterator.slice(offset, limit)
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209
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210 if self._is_content_source:
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211 self._iterator._iter_event += self._onIteration
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212
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213 self._iterator._lockIterator()
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214
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215 def _getPageUri(self, index):
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216 return self._page.getUri(index)
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217
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218 def _onIteration(self, it):
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219 if not self._pgn_set_on_ctx:
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220 rcs = self._source.app.env.render_ctx_stack
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221 if rcs.current_ctx is not None:
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222 rcs.current_ctx.setPagination(self)
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223 self._pgn_set_on_ctx = True
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224