Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/jinja2/bccache.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 # -*- coding: utf-8 -*-
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2 """
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3 jinja2.bccache
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4 ~~~~~~~~~~~~~~
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5
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6 This module implements the bytecode cache system Jinja is optionally
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7 using. This is useful if you have very complex template situations and
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8 the compiliation of all those templates slow down your application too
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9 much.
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10
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11 Situations where this is useful are often forking web applications that
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12 are initialized on the first request.
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13
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14 :copyright: (c) 2010 by the Jinja Team.
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15 :license: BSD.
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16 """
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17 from os import path, listdir
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18 import os
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19 import sys
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20 import stat
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21 import errno
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22 import marshal
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23 import tempfile
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24 import fnmatch
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25 from hashlib import sha1
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26 from jinja2.utils import open_if_exists
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27 from jinja2._compat import BytesIO, pickle, PY2, text_type
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28
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29
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30 # marshal works better on 3.x, one hack less required
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31 if not PY2:
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32 marshal_dump = marshal.dump
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33 marshal_load = marshal.load
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34 else:
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35
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36 def marshal_dump(code, f):
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37 if isinstance(f, file):
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38 marshal.dump(code, f)
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39 else:
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40 f.write(marshal.dumps(code))
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41
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42 def marshal_load(f):
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43 if isinstance(f, file):
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44 return marshal.load(f)
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45 return marshal.loads(f.read())
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46
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47
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48 bc_version = 2
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49
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50 # magic version used to only change with new jinja versions. With 2.6
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51 # we change this to also take Python version changes into account. The
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52 # reason for this is that Python tends to segfault if fed earlier bytecode
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53 # versions because someone thought it would be a good idea to reuse opcodes
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54 # or make Python incompatible with earlier versions.
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55 bc_magic = 'j2'.encode('ascii') + \
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56 pickle.dumps(bc_version, 2) + \
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57 pickle.dumps((sys.version_info[0] << 24) | sys.version_info[1])
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58
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59
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60 class Bucket(object):
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61 """Buckets are used to store the bytecode for one template. It's created
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62 and initialized by the bytecode cache and passed to the loading functions.
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63
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64 The buckets get an internal checksum from the cache assigned and use this
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65 to automatically reject outdated cache material. Individual bytecode
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66 cache subclasses don't have to care about cache invalidation.
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67 """
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68
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69 def __init__(self, environment, key, checksum):
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70 self.environment = environment
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71 self.key = key
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72 self.checksum = checksum
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73 self.reset()
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74
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75 def reset(self):
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76 """Resets the bucket (unloads the bytecode)."""
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77 self.code = None
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78
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79 def load_bytecode(self, f):
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80 """Loads bytecode from a file or file like object."""
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81 # make sure the magic header is correct
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82 magic = f.read(len(bc_magic))
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83 if magic != bc_magic:
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84 self.reset()
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85 return
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86 # the source code of the file changed, we need to reload
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87 checksum = pickle.load(f)
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88 if self.checksum != checksum:
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89 self.reset()
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90 return
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91 # if marshal_load fails then we need to reload
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92 try:
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93 self.code = marshal_load(f)
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94 except (EOFError, ValueError, TypeError):
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95 self.reset()
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96 return
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97
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98 def write_bytecode(self, f):
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99 """Dump the bytecode into the file or file like object passed."""
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100 if self.code is None:
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101 raise TypeError('can\'t write empty bucket')
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102 f.write(bc_magic)
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103 pickle.dump(self.checksum, f, 2)
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104 marshal_dump(self.code, f)
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105
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106 def bytecode_from_string(self, string):
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107 """Load bytecode from a string."""
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108 self.load_bytecode(BytesIO(string))
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109
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110 def bytecode_to_string(self):
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111 """Return the bytecode as string."""
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112 out = BytesIO()
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113 self.write_bytecode(out)
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114 return out.getvalue()
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115
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116
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117 class BytecodeCache(object):
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118 """To implement your own bytecode cache you have to subclass this class
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119 and override :meth:`load_bytecode` and :meth:`dump_bytecode`. Both of
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120 these methods are passed a :class:`~jinja2.bccache.Bucket`.
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121
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122 A very basic bytecode cache that saves the bytecode on the file system::
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123
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124 from os import path
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125
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126 class MyCache(BytecodeCache):
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127
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128 def __init__(self, directory):
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129 self.directory = directory
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130
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131 def load_bytecode(self, bucket):
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132 filename = path.join(self.directory, bucket.key)
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133 if path.exists(filename):
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134 with open(filename, 'rb') as f:
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135 bucket.load_bytecode(f)
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136
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137 def dump_bytecode(self, bucket):
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138 filename = path.join(self.directory, bucket.key)
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139 with open(filename, 'wb') as f:
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140 bucket.write_bytecode(f)
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141
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142 A more advanced version of a filesystem based bytecode cache is part of
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143 Jinja2.
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144 """
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145
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146 def load_bytecode(self, bucket):
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147 """Subclasses have to override this method to load bytecode into a
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148 bucket. If they are not able to find code in the cache for the
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149 bucket, it must not do anything.
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150 """
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151 raise NotImplementedError()
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152
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153 def dump_bytecode(self, bucket):
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154 """Subclasses have to override this method to write the bytecode
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155 from a bucket back to the cache. If it unable to do so it must not
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156 fail silently but raise an exception.
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157 """
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158 raise NotImplementedError()
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159
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160 def clear(self):
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161 """Clears the cache. This method is not used by Jinja2 but should be
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162 implemented to allow applications to clear the bytecode cache used
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163 by a particular environment.
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164 """
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165
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166 def get_cache_key(self, name, filename=None):
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167 """Returns the unique hash key for this template name."""
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168 hash = sha1(name.encode('utf-8'))
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169 if filename is not None:
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170 filename = '|' + filename
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171 if isinstance(filename, text_type):
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172 filename = filename.encode('utf-8')
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173 hash.update(filename)
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174 return hash.hexdigest()
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175
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176 def get_source_checksum(self, source):
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177 """Returns a checksum for the source."""
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178 return sha1(source.encode('utf-8')).hexdigest()
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179
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180 def get_bucket(self, environment, name, filename, source):
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181 """Return a cache bucket for the given template. All arguments are
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182 mandatory but filename may be `None`.
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183 """
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184 key = self.get_cache_key(name, filename)
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185 checksum = self.get_source_checksum(source)
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186 bucket = Bucket(environment, key, checksum)
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187 self.load_bytecode(bucket)
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188 return bucket
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189
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190 def set_bucket(self, bucket):
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191 """Put the bucket into the cache."""
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192 self.dump_bytecode(bucket)
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193
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194
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195 class FileSystemBytecodeCache(BytecodeCache):
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196 """A bytecode cache that stores bytecode on the filesystem. It accepts
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197 two arguments: The directory where the cache items are stored and a
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198 pattern string that is used to build the filename.
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199
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200 If no directory is specified a default cache directory is selected. On
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201 Windows the user's temp directory is used, on UNIX systems a directory
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202 is created for the user in the system temp directory.
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203
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204 The pattern can be used to have multiple separate caches operate on the
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205 same directory. The default pattern is ``'__jinja2_%s.cache'``. ``%s``
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206 is replaced with the cache key.
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207
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208 >>> bcc = FileSystemBytecodeCache('/tmp/jinja_cache', '%s.cache')
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209
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210 This bytecode cache supports clearing of the cache using the clear method.
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211 """
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212
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213 def __init__(self, directory=None, pattern='__jinja2_%s.cache'):
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214 if directory is None:
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215 directory = self._get_default_cache_dir()
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216 self.directory = directory
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217 self.pattern = pattern
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218
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219 def _get_default_cache_dir(self):
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220 def _unsafe_dir():
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221 raise RuntimeError('Cannot determine safe temp directory. You '
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222 'need to explicitly provide one.')
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223
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224 tmpdir = tempfile.gettempdir()
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225
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226 # On windows the temporary directory is used specific unless
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227 # explicitly forced otherwise. We can just use that.
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228 if os.name == 'nt':
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229 return tmpdir
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230 if not hasattr(os, 'getuid'):
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231 _unsafe_dir()
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232
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233 dirname = '_jinja2-cache-%d' % os.getuid()
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234 actual_dir = os.path.join(tmpdir, dirname)
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235
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236 try:
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237 os.mkdir(actual_dir, stat.S_IRWXU)
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238 except OSError as e:
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239 if e.errno != errno.EEXIST:
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240 raise
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241 try:
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242 os.chmod(actual_dir, stat.S_IRWXU)
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243 actual_dir_stat = os.lstat(actual_dir)
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244 if actual_dir_stat.st_uid != os.getuid() \
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245 or not stat.S_ISDIR(actual_dir_stat.st_mode) \
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246 or stat.S_IMODE(actual_dir_stat.st_mode) != stat.S_IRWXU:
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247 _unsafe_dir()
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248 except OSError as e:
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249 if e.errno != errno.EEXIST:
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250 raise
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251
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252 actual_dir_stat = os.lstat(actual_dir)
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253 if actual_dir_stat.st_uid != os.getuid() \
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254 or not stat.S_ISDIR(actual_dir_stat.st_mode) \
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255 or stat.S_IMODE(actual_dir_stat.st_mode) != stat.S_IRWXU:
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256 _unsafe_dir()
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257
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258 return actual_dir
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259
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260 def _get_cache_filename(self, bucket):
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261 return path.join(self.directory, self.pattern % bucket.key)
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262
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263 def load_bytecode(self, bucket):
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264 f = open_if_exists(self._get_cache_filename(bucket), 'rb')
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265 if f is not None:
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266 try:
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267 bucket.load_bytecode(f)
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268 finally:
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269 f.close()
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270
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271 def dump_bytecode(self, bucket):
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272 f = open(self._get_cache_filename(bucket), 'wb')
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273 try:
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274 bucket.write_bytecode(f)
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275 finally:
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276 f.close()
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277
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278 def clear(self):
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279 # imported lazily here because google app-engine doesn't support
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280 # write access on the file system and the function does not exist
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281 # normally.
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282 from os import remove
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283 files = fnmatch.filter(listdir(self.directory), self.pattern % '*')
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284 for filename in files:
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285 try:
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286 remove(path.join(self.directory, filename))
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287 except OSError:
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288 pass
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289
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290
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291 class MemcachedBytecodeCache(BytecodeCache):
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292 """This class implements a bytecode cache that uses a memcache cache for
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293 storing the information. It does not enforce a specific memcache library
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294 (tummy's memcache or cmemcache) but will accept any class that provides
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295 the minimal interface required.
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296
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297 Libraries compatible with this class:
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298
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299 - `werkzeug <http://werkzeug.pocoo.org/>`_.contrib.cache
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300 - `python-memcached <http://www.tummy.com/Community/software/python-memcached/>`_
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301 - `cmemcache <http://gijsbert.org/cmemcache/>`_
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302
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303 (Unfortunately the django cache interface is not compatible because it
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304 does not support storing binary data, only unicode. You can however pass
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305 the underlying cache client to the bytecode cache which is available
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306 as `django.core.cache.cache._client`.)
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307
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308 The minimal interface for the client passed to the constructor is this:
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309
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310 .. class:: MinimalClientInterface
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311
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312 .. method:: set(key, value[, timeout])
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313
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314 Stores the bytecode in the cache. `value` is a string and
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315 `timeout` the timeout of the key. If timeout is not provided
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316 a default timeout or no timeout should be assumed, if it's
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317 provided it's an integer with the number of seconds the cache
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318 item should exist.
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319
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320 .. method:: get(key)
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321
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322 Returns the value for the cache key. If the item does not
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323 exist in the cache the return value must be `None`.
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324
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325 The other arguments to the constructor are the prefix for all keys that
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326 is added before the actual cache key and the timeout for the bytecode in
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327 the cache system. We recommend a high (or no) timeout.
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328
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329 This bytecode cache does not support clearing of used items in the cache.
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330 The clear method is a no-operation function.
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331
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332 .. versionadded:: 2.7
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333 Added support for ignoring memcache errors through the
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334 `ignore_memcache_errors` parameter.
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335 """
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336
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337 def __init__(self, client, prefix='jinja2/bytecode/', timeout=None,
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338 ignore_memcache_errors=True):
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339 self.client = client
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340 self.prefix = prefix
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341 self.timeout = timeout
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342 self.ignore_memcache_errors = ignore_memcache_errors
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343
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344 def load_bytecode(self, bucket):
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345 try:
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346 code = self.client.get(self.prefix + bucket.key)
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347 except Exception:
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348 if not self.ignore_memcache_errors:
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349 raise
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350 code = None
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351 if code is not None:
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352 bucket.bytecode_from_string(code)
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353
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354 def dump_bytecode(self, bucket):
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355 args = (self.prefix + bucket.key, bucket.bytecode_to_string())
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356 if self.timeout is not None:
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357 args += (self.timeout,)
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358 try:
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359 self.client.set(*args)
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360 except Exception:
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361 if not self.ignore_memcache_errors:
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362 raise