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annotate piecrust/environment.py @ 273:d70a4adb61dd

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themes: Add the `chef themes` command The `themes` command lets the user create or override a theme easily.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 01 Mar 2015 09:07:36 -0800
parents 1187739e5a19
children aa6b7ff6a193
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diff changeset
1 import re
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2 import time
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3 import json
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4 import logging
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5 import threading
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6 import contextlib
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7 import collections
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8 import repoze.lru
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11 logger = logging.getLogger(__name__)
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13
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14 re_fs_cache_key = re.compile(r'[^\d\w\-\._]+')
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16
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17 def _make_fs_cache_key(key):
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18 return re_fs_cache_key.sub('_', key)
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19
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20
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21 class MemCache(object):
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22 """ Simple memory cache. It can be backed by a simple file-system
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23 cache, but items need to be JSON-serializable to do this.
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24 """
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25 def __init__(self, size=2048):
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26 self.cache = repoze.lru.LRUCache(size)
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27 self.fs_cache = None
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28 self._invalidated_fs_items = set()
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29 self._lock = threading.RLock()
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30
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31 @contextlib.contextmanager
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32 def startBatchGet(self):
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33 logger.debug("Starting batch cache operation.")
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34 with self._lock:
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35 yield
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36 logger.debug("Ending batch cache operation.")
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37
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38 def invalidate(self, key):
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39 with self._lock:
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40 logger.debug("Invalidating cache item '%s'." % key)
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41 self.cache.invalidate(key)
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42 if self.fs_cache:
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43 logger.debug("Invalidating FS cache item '%s'." % key)
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44 fs_key = _make_fs_cache_key(key)
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45 self._invalidated_fs_items.add(fs_key)
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47 def get(self, key, item_maker, fs_cache_time=None):
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48 item = self.cache.get(key)
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49 if item is None:
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50 logger.debug("Acquiring lock for: %s" % key)
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51 with self._lock:
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52 item = self.cache.get(key)
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53 if item is None:
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54 if (self.fs_cache is not None and
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55 fs_cache_time is not None):
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56 # Try first from the file-system cache.
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57 fs_key = _make_fs_cache_key(key)
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58 if (fs_key not in self._invalidated_fs_items and
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59 self.fs_cache.isValid(fs_key, fs_cache_time)):
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60 logger.debug("'%s' found in file-system cache." %
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61 key)
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62 item_raw = self.fs_cache.read(fs_key)
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63 item = json.loads(
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64 item_raw,
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65 object_pairs_hook=collections.OrderedDict)
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66 self.cache.put(key, item)
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67 return item
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68
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69 # Look into the mem-cache.
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70 logger.debug("'%s' not found in cache, must build." % key)
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71 item = item_maker()
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72 self.cache.put(key, item)
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73
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74 # Save to the file-system if needed.
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75 if (self.fs_cache is not None and
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76 fs_cache_time is not None):
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77 item_raw = json.dumps(item)
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78 self.fs_cache.write(fs_key, item_raw)
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79 return item
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80
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81
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82 class ExecutionInfo(object):
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83 def __init__(self, page, render_ctx):
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84 self.page = page
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85 self.render_ctx = render_ctx
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86 self.was_cache_valid = False
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87 self.start_time = time.clock()
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88
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89
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90 class ExecutionInfoStack(threading.local):
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91 def __init__(self):
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92 self._page_stack = []
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93
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94 @property
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95 def current_page_info(self):
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96 if len(self._page_stack) == 0:
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97 return None
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98 return self._page_stack[-1]
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99
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100 @property
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101 def is_main_page(self):
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102 return len(self._page_stack) == 1
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103
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104 def hasPage(self, page):
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105 for ei in self._page_stack:
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106 if ei.page == page:
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107 return True
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108 return False
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109
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110 def pushPage(self, page, render_ctx):
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111 if len(self._page_stack) > 0:
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112 top = self._page_stack[-1]
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113 assert top.page is not page
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114 self._page_stack.append(ExecutionInfo(page, render_ctx))
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115
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116 def popPage(self):
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117 del self._page_stack[-1]
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118
114
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119 def clear(self):
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120 self._page_stack = []
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121
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122
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123 class Environment(object):
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124 def __init__(self):
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125 self.start_time = None
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126 self.exec_info_stack = ExecutionInfoStack()
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127 self.was_cache_cleaned = False
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128 self.base_asset_url_format = '%uri%'
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129 self.page_repository = MemCache()
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130 self.rendered_segments_repository = MemCache()
111
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131 self.fs_caches = {
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132 'renders': self.rendered_segments_repository}
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133
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134 def initialize(self, app):
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135 self.start_time = time.clock()
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136 self.exec_info_stack.clear()
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137 self.was_cache_cleaned = False
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138 self.base_asset_url_format = '%uri%'
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139
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140 for name, repo in self.fs_caches.items():
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141 cache = app.cache.getCache(name)
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142 repo.fs_cache = cache
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143
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144
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145 class StandardEnvironment(Environment):
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146 def __init__(self):
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147 super(StandardEnvironment, self).__init__()
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148