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annotate piecrust/cache.py @ 81:d64e4703f5e6

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Propertly create `OrderedDict`s when loading YAML.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 31 Aug 2014 23:48:18 -0700
parents efd0d3bacc9e
children 7d2fdf43d7ca
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1 import os
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2 import os.path
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3 import codecs
3
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4 import logging
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5 import threading
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6
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7
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8 logger = logging.getLogger(__name__)
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9
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10
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11 class ExtensibleCache(object):
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12 def __init__(self, base_dir):
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13 self.base_dir = base_dir
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14 self.lock = threading.Lock()
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15 self.caches = {}
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16
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17 @property
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18 def enabled(self):
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19 return True
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20
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21 def getCache(self, name):
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22 c = self.caches.get(name)
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23 if c is None:
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24 with self.lock:
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25 c = self.caches.get(name)
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26 if c is None:
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27 c_dir = os.path.join(self.base_dir, name)
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28 if not os.path.isdir(c_dir):
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29 os.makedirs(c_dir, 0o755)
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30
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31 c = SimpleCache(c_dir)
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32 self.caches[name] = c
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33 return c
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34
45
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35 def getCacheDir(self, name):
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36 return os.path.join(self.base_dir, name)
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37
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38
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39 class SimpleCache(object):
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40 def __init__(self, base_dir):
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41 self.base_dir = base_dir
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42 if not os.path.isdir(base_dir):
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43 raise Exception("Cache directory doesn't exist: %s" % base_dir)
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44
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45 def isValid(self, path, time):
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46 cache_time = self.getCacheTime(path)
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47 if cache_time is None:
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48 return False
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49 if isinstance(time, list):
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50 for t in time:
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51 if cache_time < t:
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52 return False
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53 return True
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54 return cache_time >= time
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55
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56 def getCacheTime(self, path):
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57 cache_path = self.getCachePath(path)
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58 try:
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59 return os.path.getmtime(cache_path)
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60 except os.error:
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61 return None
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62
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63 def has(self, path):
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64 cache_path = self.getCachePath(path)
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65 return os.path.isfile(cache_path)
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66
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67 def read(self, path):
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68 cache_path = self.getCachePath(path)
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69 logger.debug("Reading cache: %s" % cache_path)
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70 with codecs.open(cache_path, 'r', 'utf-8') as fp:
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71 return fp.read()
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72
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73 def write(self, path, content):
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74 cache_path = self.getCachePath(path)
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75 cache_dir = os.path.dirname(cache_path)
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76 if not os.path.isdir(cache_dir):
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77 os.makedirs(cache_dir, 0o755)
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78 logger.debug("Writing cache: %s" % cache_path)
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79 with codecs.open(cache_path, 'w', 'utf-8') as fp:
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80 fp.write(content)
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81
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82 def getCachePath(self, path):
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83 if path.startswith('.'):
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84 path = '__index__' + path
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85 return os.path.join(self.base_dir, path)
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86
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87
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88 class NullCache(object):
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89 def isValid(self, path, time):
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90 return False
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91
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92 def getCacheTime(self, path):
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93 return None
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94
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95 def has(self, path):
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96 return False
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97
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98 def read(self, path):
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99 raise Exception("Null cache has no data.")
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100
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101 def write(self, path, content):
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102 pass
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103
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104 def getCachePath(self, path):
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105 raise Exception("Null cache can't make paths.")
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106
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107
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108 class NullExtensibleCache(object):
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109 def __init__(self):
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110 self.null_cache = NullCache()
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111
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112 @property
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113 def enabled(self):
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114 return False
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115
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116 def getCache(self, name):
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117 return self.null_cache
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118