Mercurial > piecrust2

annotate piecrust/cache.py @ 371:c2ca72fb7f0b 2.0.0a8

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caching: Use separate caches for config variants and other contexts. * The `_cache` directory is now organized in multiple "sub-caches" for different contexts. * A new context is created when config variants or overrides are applied. * `serve` context uses a different context that the other commends, to prevent the `bake` command's output from messing up the preview server (e.g. with how asset URLs are generated differently between the two). * Fix a few places where the cache directory was referenced directly.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 03 May 2015 23:59:46 -0700
parents 7d2fdf43d7ca
children ff6cc43fb40c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 import os
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2 import os.path
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3 import shutil
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4 import codecs
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5 import logging
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6 import threading
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7
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8
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9 logger = logging.getLogger(__name__)
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10
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11
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12 class ExtensibleCache(object):
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13 def __init__(self, base_dir):
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14 self.base_dir = base_dir
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15 self.lock = threading.Lock()
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16 self.caches = {}
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17
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18 @property
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19 def enabled(self):
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20 return True
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21
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22 def getCache(self, name):
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23 c = self.caches.get(name)
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24 if c is None:
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25 with self.lock:
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26 c = self.caches.get(name)
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27 if c is None:
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28 c_dir = os.path.join(self.base_dir, name)
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29 if not os.path.isdir(c_dir):
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30 os.makedirs(c_dir, 0o755)
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31
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32 c = SimpleCache(c_dir)
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33 self.caches[name] = c
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34 return c
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35
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36 def getCacheDir(self, name):
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37 return os.path.join(self.base_dir, name)
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38
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39 def getCacheNames(self, except_names=None):
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40 _, dirnames, __ = next(os.walk(self.base_dir))
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41 if except_names is None:
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42 return dirnames
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43 return [dn for dn in dirnames if dn not in except_names]
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44
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45 def clearCache(self, name):
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46 cache_dir = self.getCacheDir(name)
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47 if os.path.isdir(cache_dir):
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48 logger.debug("Cleaning cache: %s" % cache_dir)
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49 shutil.rmtree(cache_dir)
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50
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51 def clearCaches(self, except_names=None):
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52 for name in self.getCacheNames(except_names=except_names):
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53 self.clearCache(name)
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54
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55
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56 class SimpleCache(object):
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57 def __init__(self, base_dir):
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58 self.base_dir = base_dir
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59 if not os.path.isdir(base_dir):
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60 raise Exception("Cache directory doesn't exist: %s" % base_dir)
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61
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62 def isValid(self, path, time):
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63 cache_time = self.getCacheTime(path)
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64 if cache_time is None:
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65 return False
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66 if isinstance(time, list):
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67 for t in time:
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68 if cache_time < t:
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69 return False
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70 return True
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71 return cache_time >= time
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72
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73 def getCacheTime(self, path):
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74 cache_path = self.getCachePath(path)
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75 try:
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76 return os.path.getmtime(cache_path)
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77 except os.error:
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78 return None
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79
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80 def has(self, path):
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81 cache_path = self.getCachePath(path)
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82 return os.path.isfile(cache_path)
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83
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84 def read(self, path):
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85 cache_path = self.getCachePath(path)
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86 logger.debug("Reading cache: %s" % cache_path)
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87 with codecs.open(cache_path, 'r', 'utf-8') as fp:
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88 return fp.read()
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89
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90 def write(self, path, content):
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91 cache_path = self.getCachePath(path)
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92 cache_dir = os.path.dirname(cache_path)
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93 if not os.path.isdir(cache_dir):
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94 os.makedirs(cache_dir, 0o755)
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95 logger.debug("Writing cache: %s" % cache_path)
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96 with codecs.open(cache_path, 'w', 'utf-8') as fp:
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97 fp.write(content)
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98
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99 def getCachePath(self, path):
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100 if path.startswith('.'):
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101 path = '__index__' + path
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102 return os.path.join(self.base_dir, path)
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103
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104
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105 class NullCache(object):
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106 def isValid(self, path, time):
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107 return False
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108
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109 def getCacheTime(self, path):
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110 return None
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111
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112 def has(self, path):
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113 return False
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114
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115 def read(self, path):
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116 raise Exception("Null cache has no data.")
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117
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118 def write(self, path, content):
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119 pass
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120
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121 def getCachePath(self, path):
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122 raise Exception("Null cache can't make paths.")
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123
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124
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125 class NullExtensibleCache(object):
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126 def __init__(self):
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127 self.null_cache = NullCache()
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128
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129 @property
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130 def enabled(self):
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131 return False
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132
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133 def getCache(self, name):
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134 return self.null_cache
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135
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136 def getCacheDir(self, name):
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diff changeset
137 raise NotImplementedError()
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Ludovic Chabant <ludovic@chabant.com>
parents: 105
diff changeset
138
c2ca72fb7f0b caching: Use separate caches for config variants and other contexts.
Ludovic Chabant <ludovic@chabant.com>
parents: 105
diff changeset
139 def getCacheNames(self, except_names=None):
c2ca72fb7f0b caching: Use separate caches for config variants and other contexts.
Ludovic Chabant <ludovic@chabant.com>
parents: 105
diff changeset
140 return []
c2ca72fb7f0b caching: Use separate caches for config variants and other contexts.
Ludovic Chabant <ludovic@chabant.com>
parents: 105
diff changeset
141
c2ca72fb7f0b caching: Use separate caches for config variants and other contexts.
Ludovic Chabant <ludovic@chabant.com>
parents: 105
diff changeset
142 def clearCache(self, name):
c2ca72fb7f0b caching: Use separate caches for config variants and other contexts.
Ludovic Chabant <ludovic@chabant.com>
parents: 105
diff changeset
143 pass
c2ca72fb7f0b caching: Use separate caches for config variants and other contexts.
Ludovic Chabant <ludovic@chabant.com>
parents: 105
diff changeset
144
c2ca72fb7f0b caching: Use separate caches for config variants and other contexts.
Ludovic Chabant <ludovic@chabant.com>
parents: 105
diff changeset
145 def clearCaches(self, except_names=None):
c2ca72fb7f0b caching: Use separate caches for config variants and other contexts.
Ludovic Chabant <ludovic@chabant.com>
parents: 105
diff changeset
146 pass
c2ca72fb7f0b caching: Use separate caches for config variants and other contexts.
Ludovic Chabant <ludovic@chabant.com>
parents: 105
diff changeset
147