Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/jinja2/bccache.py @ 3:758bc20232e8 draft

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:20:52 -0400
parents 26e78fe6e8c4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # -*- coding: utf-8 -*-
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2 """The optional bytecode cache system. This is useful if you have very
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3 complex template situations and the compilation of all those templates
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4 slows down your application too much.
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5
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6 Situations where this is useful are often forking web applications that
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7 are initialized on the first request.
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8 """
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9 import errno
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10 import fnmatch
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11 import os
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12 import stat
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13 import sys
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14 import tempfile
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15 from hashlib import sha1
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16 from os import listdir
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17 from os import path
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18
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19 from ._compat import BytesIO
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20 from ._compat import marshal_dump
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21 from ._compat import marshal_load
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22 from ._compat import pickle
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23 from ._compat import text_type
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24 from .utils import open_if_exists
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25
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26 bc_version = 4
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27 # Magic bytes to identify Jinja bytecode cache files. Contains the
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28 # Python major and minor version to avoid loading incompatible bytecode
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29 # if a project upgrades its Python version.
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30 bc_magic = (
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31 b"j2"
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32 + pickle.dumps(bc_version, 2)
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33 + pickle.dumps((sys.version_info[0] << 24) | sys.version_info[1], 2)
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34 )
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35
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36
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37 class Bucket(object):
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38 """Buckets are used to store the bytecode for one template. It's created
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39 and initialized by the bytecode cache and passed to the loading functions.
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40
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41 The buckets get an internal checksum from the cache assigned and use this
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42 to automatically reject outdated cache material. Individual bytecode
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43 cache subclasses don't have to care about cache invalidation.
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44 """
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45
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46 def __init__(self, environment, key, checksum):
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47 self.environment = environment
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48 self.key = key
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49 self.checksum = checksum
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50 self.reset()
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51
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52 def reset(self):
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53 """Resets the bucket (unloads the bytecode)."""
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54 self.code = None
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55
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56 def load_bytecode(self, f):
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57 """Loads bytecode from a file or file like object."""
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58 # make sure the magic header is correct
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59 magic = f.read(len(bc_magic))
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60 if magic != bc_magic:
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61 self.reset()
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62 return
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63 # the source code of the file changed, we need to reload
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64 checksum = pickle.load(f)
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65 if self.checksum != checksum:
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66 self.reset()
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67 return
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68 # if marshal_load fails then we need to reload
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69 try:
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70 self.code = marshal_load(f)
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71 except (EOFError, ValueError, TypeError):
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72 self.reset()
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73 return
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74
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75 def write_bytecode(self, f):
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76 """Dump the bytecode into the file or file like object passed."""
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77 if self.code is None:
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78 raise TypeError("can't write empty bucket")
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79 f.write(bc_magic)
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80 pickle.dump(self.checksum, f, 2)
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81 marshal_dump(self.code, f)
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82
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83 def bytecode_from_string(self, string):
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84 """Load bytecode from a string."""
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85 self.load_bytecode(BytesIO(string))
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86
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87 def bytecode_to_string(self):
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88 """Return the bytecode as string."""
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89 out = BytesIO()
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90 self.write_bytecode(out)
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91 return out.getvalue()
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92
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93
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94 class BytecodeCache(object):
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95 """To implement your own bytecode cache you have to subclass this class
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96 and override :meth:`load_bytecode` and :meth:`dump_bytecode`. Both of
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97 these methods are passed a :class:`~jinja2.bccache.Bucket`.
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98
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99 A very basic bytecode cache that saves the bytecode on the file system::
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100
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101 from os import path
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102
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103 class MyCache(BytecodeCache):
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104
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105 def __init__(self, directory):
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106 self.directory = directory
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107
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108 def load_bytecode(self, bucket):
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109 filename = path.join(self.directory, bucket.key)
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110 if path.exists(filename):
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111 with open(filename, 'rb') as f:
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112 bucket.load_bytecode(f)
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113
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114 def dump_bytecode(self, bucket):
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115 filename = path.join(self.directory, bucket.key)
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116 with open(filename, 'wb') as f:
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117 bucket.write_bytecode(f)
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118
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119 A more advanced version of a filesystem based bytecode cache is part of
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120 Jinja.
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121 """
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122
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123 def load_bytecode(self, bucket):
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124 """Subclasses have to override this method to load bytecode into a
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125 bucket. If they are not able to find code in the cache for the
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126 bucket, it must not do anything.
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127 """
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128 raise NotImplementedError()
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129
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diff changeset
130 def dump_bytecode(self, bucket):
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131 """Subclasses have to override this method to write the bytecode
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132 from a bucket back to the cache. If it unable to do so it must not
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parents:
diff changeset
133 fail silently but raise an exception.
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134 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
135 raise NotImplementedError()
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136
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137 def clear(self):
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138 """Clears the cache. This method is not used by Jinja but should be
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
139 implemented to allow applications to clear the bytecode cache used
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140 by a particular environment.
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141 """
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142
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143 def get_cache_key(self, name, filename=None):
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144 """Returns the unique hash key for this template name."""
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145 hash = sha1(name.encode("utf-8"))
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146 if filename is not None:
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147 filename = "|" + filename
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148 if isinstance(filename, text_type):
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149 filename = filename.encode("utf-8")
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150 hash.update(filename)
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151 return hash.hexdigest()
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152
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153 def get_source_checksum(self, source):
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154 """Returns a checksum for the source."""
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155 return sha1(source.encode("utf-8")).hexdigest()
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156
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157 def get_bucket(self, environment, name, filename, source):
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158 """Return a cache bucket for the given template. All arguments are
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159 mandatory but filename may be `None`.
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160 """
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parents:
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161 key = self.get_cache_key(name, filename)
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parents:
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162 checksum = self.get_source_checksum(source)
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163 bucket = Bucket(environment, key, checksum)
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parents:
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164 self.load_bytecode(bucket)
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165 return bucket
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166
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167 def set_bucket(self, bucket):
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diff changeset
168 """Put the bucket into the cache."""
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169 self.dump_bytecode(bucket)
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170
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171
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172 class FileSystemBytecodeCache(BytecodeCache):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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173 """A bytecode cache that stores bytecode on the filesystem. It accepts
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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174 two arguments: The directory where the cache items are stored and a
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
175 pattern string that is used to build the filename.
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176
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177 If no directory is specified a default cache directory is selected. On
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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178 Windows the user's temp directory is used, on UNIX systems a directory
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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179 is created for the user in the system temp directory.
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180
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diff changeset
181 The pattern can be used to have multiple separate caches operate on the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
182 same directory. The default pattern is ``'__jinja2_%s.cache'``. ``%s``
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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183 is replaced with the cache key.
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184
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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185 >>> bcc = FileSystemBytecodeCache('/tmp/jinja_cache', '%s.cache')
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186
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187 This bytecode cache supports clearing of the cache using the clear method.
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188 """
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189
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190 def __init__(self, directory=None, pattern="__jinja2_%s.cache"):
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parents:
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191 if directory is None:
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192 directory = self._get_default_cache_dir()
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parents:
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193 self.directory = directory
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194 self.pattern = pattern
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195
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196 def _get_default_cache_dir(self):
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parents:
diff changeset
197 def _unsafe_dir():
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
198 raise RuntimeError(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
199 "Cannot determine safe temp directory. You "
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
200 "need to explicitly provide one."
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
201 )
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parents:
diff changeset
202
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
203 tmpdir = tempfile.gettempdir()
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diff changeset
204
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
205 # On windows the temporary directory is used specific unless
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
206 # explicitly forced otherwise. We can just use that.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
207 if os.name == "nt":
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
208 return tmpdir
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
209 if not hasattr(os, "getuid"):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
210 _unsafe_dir()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
211
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
212 dirname = "_jinja2-cache-%d" % os.getuid()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
213 actual_dir = os.path.join(tmpdir, dirname)
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parents:
diff changeset
214
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
215 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
216 os.mkdir(actual_dir, stat.S_IRWXU)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
217 except OSError as e:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
218 if e.errno != errno.EEXIST:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
219 raise
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
220 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
221 os.chmod(actual_dir, stat.S_IRWXU)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
222 actual_dir_stat = os.lstat(actual_dir)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
223 if (
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
224 actual_dir_stat.st_uid != os.getuid()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
225 or not stat.S_ISDIR(actual_dir_stat.st_mode)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
226 or stat.S_IMODE(actual_dir_stat.st_mode) != stat.S_IRWXU
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
227 ):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
228 _unsafe_dir()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
229 except OSError as e:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
230 if e.errno != errno.EEXIST:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
231 raise
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
232
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
233 actual_dir_stat = os.lstat(actual_dir)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
234 if (
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
235 actual_dir_stat.st_uid != os.getuid()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
236 or not stat.S_ISDIR(actual_dir_stat.st_mode)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
237 or stat.S_IMODE(actual_dir_stat.st_mode) != stat.S_IRWXU
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
238 ):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
239 _unsafe_dir()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
240
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
241 return actual_dir
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
242
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
243 def _get_cache_filename(self, bucket):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
244 return path.join(self.directory, self.pattern % bucket.key)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
245
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
246 def load_bytecode(self, bucket):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
247 f = open_if_exists(self._get_cache_filename(bucket), "rb")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
248 if f is not None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
249 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
250 bucket.load_bytecode(f)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
251 finally:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
252 f.close()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
253
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
254 def dump_bytecode(self, bucket):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
255 f = open(self._get_cache_filename(bucket), "wb")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
256 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
257 bucket.write_bytecode(f)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
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258 finally:
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259 f.close()
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260
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261 def clear(self):
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262 # imported lazily here because google app-engine doesn't support
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263 # write access on the file system and the function does not exist
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264 # normally.
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265 from os import remove
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266
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267 files = fnmatch.filter(listdir(self.directory), self.pattern % "*")
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268 for filename in files:
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269 try:
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270 remove(path.join(self.directory, filename))
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271 except OSError:
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272 pass
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273
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274
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275 class MemcachedBytecodeCache(BytecodeCache):
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276 """This class implements a bytecode cache that uses a memcache cache for
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277 storing the information. It does not enforce a specific memcache library
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278 (tummy's memcache or cmemcache) but will accept any class that provides
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279 the minimal interface required.
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280
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281 Libraries compatible with this class:
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282
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283 - `cachelib <https://github.com/pallets/cachelib>`_
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284 - `python-memcached <https://pypi.org/project/python-memcached/>`_
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285
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286 (Unfortunately the django cache interface is not compatible because it
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287 does not support storing binary data, only unicode. You can however pass
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288 the underlying cache client to the bytecode cache which is available
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289 as `django.core.cache.cache._client`.)
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290
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291 The minimal interface for the client passed to the constructor is this:
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292
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293 .. class:: MinimalClientInterface
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294
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295 .. method:: set(key, value[, timeout])
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296
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297 Stores the bytecode in the cache. `value` is a string and
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298 `timeout` the timeout of the key. If timeout is not provided
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299 a default timeout or no timeout should be assumed, if it's
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300 provided it's an integer with the number of seconds the cache
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301 item should exist.
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302
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303 .. method:: get(key)
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304
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305 Returns the value for the cache key. If the item does not
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306 exist in the cache the return value must be `None`.
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307
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308 The other arguments to the constructor are the prefix for all keys that
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309 is added before the actual cache key and the timeout for the bytecode in
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310 the cache system. We recommend a high (or no) timeout.
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311
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312 This bytecode cache does not support clearing of used items in the cache.
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313 The clear method is a no-operation function.
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314
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315 .. versionadded:: 2.7
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316 Added support for ignoring memcache errors through the
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317 `ignore_memcache_errors` parameter.
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318 """
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319
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320 def __init__(
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321 self,
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322 client,
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323 prefix="jinja2/bytecode/",
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324 timeout=None,
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325 ignore_memcache_errors=True,
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326 ):
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327 self.client = client
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328 self.prefix = prefix
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329 self.timeout = timeout
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330 self.ignore_memcache_errors = ignore_memcache_errors
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331
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332 def load_bytecode(self, bucket):
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333 try:
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334 code = self.client.get(self.prefix + bucket.key)
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335 except Exception:
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336 if not self.ignore_memcache_errors:
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337 raise
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338 code = None
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339 if code is not None:
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340 bucket.bytecode_from_string(code)
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341
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342 def dump_bytecode(self, bucket):
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343 args = (self.prefix + bucket.key, bucket.bytecode_to_string())
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344 if self.timeout is not None:
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345 args += (self.timeout,)
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346 try:
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347 self.client.set(*args)
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348 except Exception:
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349 if not self.ignore_memcache_errors:
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350 raise